is 12709 grp pipes & fittings for potable water supply - specifications

8/11/2019 IS 12709 GRP Pipes & Fittings for Potable water supply - specifications

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I S 12709 : 1994 Reaffirmed 200 9

( )

Indian Standard ,

GLASS FIBRE REINFORCED PLASTICS (GRP) PIPES, JOINTS AND FITTINGS FOR USE FOR

POTABLE WATER SUPPLY S PECIFICATION

( First Revision )"

UDC 621 . 643 . 2 : 678 .5/ .8 .067 .5 : 628 .1 / .2

BIS 1994.

BUREAU OF INDIAN STANDARDS \ '

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NE W DELHI 110002

May 1994 : ; j ~ ~ : \ . Price Gro up 9


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AMENDMENT NO 1 OCTOBER 1995TO

IS 12709: 1994 GLASS FIBRE REINFORCED PlASTICS GRP PIPES, JOINTS AND F m I N G S FO R USE FOR

POTABLE WATER SUPPLY - SPECIFICATION FirstRevision

Page 3, ble 2 ) - Add the foUowing It theend:

N uaa DIam. . . . , DN 0 .on Tolenace2200 2248 7 0

2400 2452 7 5

2600 2656 8 0 -2.0

2800 2860 8 5

3000 3064 9 0

Page t 1, Ann6 E clause ~ ) - Substitute tbe foJJowing or the

existing: .6.1 Foreach test piece, calculate the apparent hOQPtensile strength at failurea Ii in tN m from tbe following equation: .

Fa gi:l

2 WSinzOwhere

== failure load, kN;

widtb of testpiece,m;and

9 planeangle between hooporiented reinforcement and Iongitudillllaxis of tbe pipe helix Ingle).

CEDSORepropapla, Uaia, DIS, New Del , ia


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AMENDMENT NO NOVEMBER 99TO

IS 12709 : 1994 GLASS FIBRE REINFORCEDPLASTICS (GRP) PIPES, JOINTS AND FITTINGS

FOR USE FO R POTABLE WATER SUPPLY-- SPECIFICATION First Revision

Page I, clause 1.2) - Substitute the following for the-existing:

1 .2 Provisions relating to fittings fabricated from ORP pipes or by moulding process and joints covered in thisstandard are for guidance ollly

Page 2, Table 1 ) - For ax Inside Diameter Range, ID put } against the entries 714, 816 and J H.

age 3, clause 7.2, line 1)- Substitute effective fo r nominal .

ag e 3, clause 7.2.1, line 1) - Substitute effective fo r nonunal .

ag e 3, clause 9 ) - Substitute the following for the exist ing:

9 WORKMANSHIP

Workmanship shall be in accordancewith good practicesas listed in Table 1() and shall meet th e acceptance criteriaspecified.

Table lU Allowable Defects

m ~

Chip

Crack

Crack, surface

Crazing

Delaminationedge

Delamination

internal

Dry-spot

Foreign inclusion(metallic)

Foreign inclusion non-metallic)

Fracture

Airbubble void)

Blister

PriceGroop I

Definit ion

A small piece b ro ken of f an edge or sur face

An actual separat ion of the laminate, visible onopposite surfaces, and extending through the th ickness

Crack existing only on the su rf ac e of the la min at e

Fine cracks at or under the surface of u laminate

Separation of the layers of material at the edge of Itlaminate

Separation of the layers of material in tJ laminate

Aree of incomplete surface film where the reinforce-mcn t has not been wetted with resin

Metallic particles included. in laminate which areforeign to its composit ion

Non-mettslhc particles of substance included in al amin ate which seem foreign to its composition

Rupture o f laminate surface without complete penetration

Air entrapment within and between the plies of reinforcement, usually spherical in shape

Rounded elevation o f the surface of a laminate, withboundaries that may be more or less sharply defined.somewhat resembling in shape at blister on the humanskin

Visual Acceptance Levels

Maximumdimension of break 6.5 mm

None

Maximum length, 6.S mm

Maximum dimension of crazing, 2.5 mm

Maximum dimension, 6.5 mm

None

Maximum diameter, 14 mm



Maximum dimension, 29 mm

Maxitnum diauneter 3.0 rom

Maximum diameter, 6.S mm;height from surface not to be outside drawingtolerance


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AMENDMENT N O 3 APRIL 2004TO

IS 12709: 1994 GLASS FIBRE REINFORCED PLASTICS(GRP) PIPES, JOINTS AND FITTINGS FO R USE FO R

PO T ABLE WA TE R SUPPLY- SPECIFICATION

n t Re,ilio )

( ge I, cl use 4.1.2, line 3 - Substitute 248 for 240 .

CEO 50eprogr phy Unit,DIS,NewDelhi,India


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AMENDMENT NO. 4 JUNE 2011TO

IS 12709 : 1994 GLASS FIBRE REINFORCED PLASTICS (GRP) PIPES, JOINTSAND FITTINGS FOR USE FOR POTABLE WATER SUPPLY

SPECIFICATION

( First Revision )

(Page 2, Table 1) Insert the following at appropriate places in ascending order in the table:

Nominal Inside Diameter Range, ID Tolerances onDiameter, DN Declared ID

Min Max 1 300 1 295 1 320 51 500 1 495 1 520 5

[Page 3, Table 2 ( see also Amendment No. 1)] Insert the following at appropriate places inascending order in the table:

Nominal Outside Diameter, OD ToleranceDiameter, DN

1 300 1 330 51 500 1 534 5


Nominal Beam Load Minimum Longitudinal Tensile Strength inDiameter kN/m of Circumference, for Pressure Class

DN P PN 3 PN 6 PN 9 PN 12 PN 15

1 300 152 226 345 393 4681 500 175 265 397 454 540


Nominal Minimum Hoop Tensile Strength of Pipe Wall inDiameter kN/m Width of Circumference for Pressure Class

mm PN 3 PN 6 PN 9 PN 12 PN 15

1 300 790 1 580 2 369 3 159 3 9491 500 911 1 823 2 734 3 645 4 556

1


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Amend No. 1 to IS 12709 : 1994

(Page 11, clause E-5.3 ) Substitute the following for the existing:

Load the test piece by separating the mounts at a rate not exceeding 2.5 mm/min and record themaximum force resisted by the test piece.

(CED 50)

Reprography Unit, BIS, New Delhi, In

2


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Indian StandardGLASS FIBRE REINFORCED PLASTICS (GRP)PIPES, JOINTS AND FITTINGS FOR USE FORPOTABLE W TER SUPPLY- SPECIFICATION

First Revision

Size designation of the pipe is based on the nominaldiameter, DN Nominal diameter shall be chosen fromtbose given helow:200 250 300 350 400. 450, 500 600 700, 800, lJOO1000, 1 100, t 200, t 400, 1 6 00 , 1 8 00 , 2 0 00 , 2 200,2 400 2 600, 2 and 3 000 nun. M T E R l L ~

6.1 Resins

Appropriate type of unsaturatcd polyester resin systems

conforming to IS 6746 : 1994 shall be used.

3.3l..1iner

A resin layer, with or without fil ler, or reinforcement,or both, forming the interior surface of the pipe.3.4 Tests3 4 Type TestTests carried out whenever a significa ntchange is madein thc design, composition or process of manufacturingand/or-at a specified frequency in order to establish thesuitability and performance capability of the pipes.3.4.2 Acceptuncc TestTests carried ou t on s am p le s t ak en f ro m a lo t for th epurpose of acceptance of the lot.4 : I . A S S I } ~ I ~ A T I N

4.1 The pipes have been class if ied on the basis ofpressure rating and stiffness class as given in 4.1.1and 4.1.2.4.1.1 Pressure Classes PN

Five pressure classes of pipes namely, PN 3, PN 6,PN 9, PN 12 an d PN 15 correspond to the working pressure ratings of 300 600 900 1 200 and 1 50 0 kParespectively.

xorns1 e working pressure ratings mentioned above mayhave to be c ha ng ed [or usc at tluid temperature greaterthan 4 3 . 5 ~in a cc or da nc e w it ht the manufacturer srecornmenda tions2 The above pressure classes correspond to the long termhydrostatic design pressure categories ( see IS ).

4.1.2 Stiffness Classes SNFour stiffness classes of pipes namely A, B, C and Dcorrespond 10 minimum pipe sti ffness values of 62,124, 240 and 496 kPa respectively at 5 deflection.

S S I Z J 4 ~DESI(;NATI()N ANI) N()MIMAIJ I METER

Title

Rubber sea ling rings for gas mains,water mains and sewers ifirs: revision

Unsaturated polyester resin systemsfor low pressure fibre reinforcedplastic.Method of analysis for the dcterminat ion of and/or overa II migration of constituents of plastic materials a ndarticles intended to come into contactwith foodstuffs

98 45 : 1986

6746: 1994

2 REFERENCES2.1 The folllowingIndian Standards are necessary adjuncts to this standard:

IS No.5382: 1985

1 S : O J I ~

1.1 th is speci fi ca tion covers requiremeuts formaterials, dimensions, classification, testing and typeof joints of machine-made pipes with glass fibre rein

forced thermosetting resin with or without aggregatefiller having nomina I dia meter from 20 0 nun to 3 000I1Ull for use at pressure up to 1 500 kPa for conveyanceof potable water.1.2 Provisions relat ing to fi ttings fabricated fromGRP pipes or by moulding process have also been

covered.

11273 : 1992 Woven roving fabrics of E glassfibre

11320 : 9 8 5 ~Glass fibre rovings for the reinforcemeut of polyester and cpoxide resinsystems first revision

11551 : 1986 Glass fibre chopped strand mat forthe reinforcement of polyester resinsystem

3 TERMIN()LO(iY3.1 Glass Fibre PipeA tubular product containingglass fibre reinforcementsembedded il l or surrounded by cured thermosettingresin. The composite structure may contain aggregate(silicious), fillers, thixotroic agents. Thermoplasticor

tbenuoset ting liner and /or surface layer may be included.3.2 Surface LayerA resin layer, with or without filler, or reinforcements,or hoth, applied to the exterior surface of the pipe

structural wall. :


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IS 12709: 1994

6.1.1 The res in and add i tive s u sed sha ll be such thatthey contain no ingredients, that is, in an 81110Ull1 tbatbas been demonstrated to migrate into water in quantities that. arc considered to be toxic; satisfying thepotability of water as determined by tests specifiedin 16.6.2 Glass Fibre ReinforcementGlass fibre reinforcement shall b e of conunercialgrade E type and shall conform to IS 273 : 1992,IS 11320 : t 985 or IS 11551 : t986, as appropriate.6.3 Other Materials6.3.1 AggregatesSiliceous sand ofa size range between 0.05 mmand0.8nun may be incorporated in the composite structure.

).3.2 Filler

Jnert fillers with particle size below 0.05 nun) may beincorporated either 011 their own or with aggregates.

6.3.3 AdditivesAdditives may be inc orp ora ted for m od if yi ng t heproperties of the resin.

7 DIMENSI )NS

7.1 Specified Diameter of Pipes

7.1.1 Inside diameters of pipes for each o f th e sizedesignation shall be asspecified in the IU3 nufacturer sdata sheet, current at the time of purchase. The insidediameter so specified shall be within the range given inTab le 1 an d shall meet the tolerances, as specified.7.1.1.1 The inside diameter shall be measured inaccordance with A-l.1.7.1.Z Alternatively, the outside diameter of pipes for

. each of the size designation shall be as given in Table

2; subject to the tolerances, as specified.7.1.Z.1 The outside diameter shall be measured inaccordance with A-l.Z.

Table 1 Specified Inside Diameters an d Tolerances Clauses 7.1.1 and 7. 4 )

All dimensions in rnillimetres.

Nomlnal Dlameter DN . Ins ide Diameter Range I D Tolerances on Declared ID

n Max

200 196 204

250 246 255300 296 30h350 346 35naoo 396 ~ ~45 l 446 4SQ

500 496 510600 SQ6 612

700 6< 5 71.t800 7Q5 Rill 8Q5 QIN

1000 995 I02 t1 100 1 Q 2

1 200 1 lQ5 12201400 1 395 14201600 lSQ5 1fl201800 17Q5 1 X: }2000 1 Ql)5 2020

22 21Q5 22202400 2395 242026 25Q5 26202800 27Q5 2 H2O3 29Q5 3020

2

1.5

~ 1.5 1.8 2.0 2.4 J; 2.7 3.0:t 3.6

4.2

~ 6


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IS 12709 : 1994

Table Z Specified Outside Diameters an d Tolerances Clauses 7.1.2 and 7.4 )

All dimensionsin millimetres.

Nomlnul Diameter, DN20025030035040045050 0

600700800 OO

1000

I 100 2

1400

1600

18002000

Outside Diameter, 208 Q

310361412463514614718820Q

J 02411261 2281432 6 36

8 4

2 44

Tolerance 2.0+ 2.1+ 2.3 2.4+ 2.5 2.7 2.R+ 3.0 3.3 3.5+ 3.R 4.0+ 4.3 4.5+ 5.0 5.5+ 6.0+ 6.5

2.0

7.2 LengthsPipes sbalJ be supplied in nominal lcugths of 6 Ill, 9 Inand 12 Ill. A maximum of 10 percent of the pipe sectionmay be supplied in random lengths. The length of thepipe shall he measured in accordance with A-2.1.

N ~ - Lengths other than those specified above ybe supplied as agreed between the purchaser and themanufacturer.

7.2.1 The tolerance 011 nominaI lengths shall he within 25 llIIH.7.3 Out of Square ness of Pipe

All points around each end of a pipe unit shall fallwithin ::t6 5 nun or ::to 5 percent of the nominaldiameterof the pi pe whichever is greater, to a pl ane pe rpe ndicular 10 the longitudinal axis of the pipe whenmeasured in accordance with A-3. t .7.4 Wall 11licknessThe minimum wall thickness at any point shall not beless than the wall thickness specified in themanufacturer s data sheets current at the time of purchase, The manufacturer shall ensure that the wallthickness specified in his data sheet shall be such as tosatisfy the inside or outside diameters specified inTahie 1 or Table 2 as the case may be and the testsspecified in this standard.7.4.1 Wall thickness shall be measured to an accuracyof 0.1 nun in accordance with A-4.1.8 J )INTSThe pipe shall have a joining system tbat shall providefor fluid tightness for tbe intended service condition.S.1 Unresn alned

Pipe joints capable of withstanding internal pressure

3

hut not longitudinal forces.8.1.1 Coupling or Socket n Spigot Gasket JointsProvided with groove s) either on the spigot or in thesocket to retain an elastomeric gasket s) that shall hethe sole element of the joint to provide wa tertightness.For typical joint detail see Fig. 1).8.1.2 Mechanical Couplings

8.2 Restrained

Pipe joints capable of withstanding internal pressureand longitudinal forces,8.2.1 Joints similar to those in 8.1.1 with supplementalrostra ining elements, .8.2.2 Butt Joint - with laminated overlay8.2.3 Socket and Spigot w i t h laminated overlay.8.2.4 Soocket and Spigot - adhesive bonded .8.2.5 l nged

8.2.6 Mechanical

8.3 Gaskets

Elastomeric gaskets when used with this pipe shai:conform to the requirements of IS 5382 : 1985.

9 W lRKMANSHII

9.1 Pipes shall be free fro III all defects includingindentations, de lamiuatiou, bubbles, pinholes,cracks, pits, blisters, foreign inclusions and resinstarved areas that due to their nature, degree, orextent detrimentally affect tbe strength and serviceability of the pipe. The pipe shall be as uniform Iconuucrcially practicable in colour opacity, dens it ,

and other physical properties.


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IS 12709: 9 4

FIG. I TYPICAL J O ~ T S

Table 3 Pipe Stiffness at 5 Percent Deflection

10.1.1 Pipesshall be capable ofbeingdeOected to level X with no visible damage in tbe test specimenevidenced by surface cracks and to level V with no

where = load per unit length in kN per metre length,and =vertical pipe deflection, in metres

9.2 The inside surface of each pipe shall be free ofbulges, dents, ridges and other defects that result in avariation of inside diameter of more than3.2 nun fromtbat obtained on adjacent unaffected portions of thesurface. Noglass fibre reinforcement shall penetrate theinterior surface of the pipe wall.9.3 Joint sealing surfaces shall be free of dents, gouges,and other surface irregularities that will affect the integrity of the joints.10 PIPE STIFFNESS ~10.1 Each length o f pipe shall have sufficient strengthto exhibit tbe minimum pipe stiffness / d y) specifiedinTable 3 wben tested in accordance with Annex B

A B C 0Level, X 18 15 12 9Level, Y 30 25 20 15

NOTE - This is a visual observation made with theunaidedeye) forquality control purposes only and shouldnot be considered a simulated service test. In actual uscthis product is not recommended for deflections above5 . Sincethe pipestitIness values / L\y)shown inTable3 vary, the percent deflection of the pipe under given setof installationconditions will not he constaot forall pipesTosavoid possible misapplicatiou, carv should be takento analyse all conditions which might affect performanceof the installedpipe.

11 FITrlNGS

11.1 General

All GRP fittings, such as bends, tees, junctions andreducers, shall be equal or superior in performancetopipe of the same classification and shall be smoothlyfinished internally.GRP fittings are not subject to tests for strength and itis essential that external restraint be considered forinstallalion.

indication of structural damage as evidenced by interlaminar separation, separation of the liner or surfacelayer if incorporated) fro structural wall, tensilefailure of the glass fibre reinforcement and fracture orbuckling of the pipe wall, when tested in accordancewith Annex B.

Ring eflection Witllout eflection Level amageor Structural ailure in

Percentfor pipe Stiffness C ss

124

248496

48

496

Mlnlmunl Stiffness of Pipe of DN,at 5 Percent Denec:tlon ~

200 mrn 250 mm 300 mmnnd above

62

124

248496

A

BC[>

StilTness ~ a s s SN)

4


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IS 11709 : 1994

13 LONGITUDINAL STRENG]For sizes up to DN 600 tbe pipe shall withstand,witbout failure, the beam loads specified in Table 5,wben tested in accordance with D-l. For pipe sizeslarger than ON600 and alternatively for smaller sizesadequate beam strengthshall be demonstrated by tensile tes ts conducted in accordance with D-1 for pipewall specimens oriented in the longitudinal direction.The minimum tensile strength specified inTable 5 shallbe complied with.

NOTE - Th e values listed in fabl e 5 are the minimumcriteria for pipes made to this standard, The values maynot be indicative of the axial strength or of the axialstrength required by some installation conditions andjoint configurations.

H O O P T E N S ~ E S T R E N G T H

All pipes manufactured as pe r this specification shallmeet or exceed the hoop tensile strength shown for eachsize and class inTable 6, when tested in accordancewitb Annex E.

Hydrostatic Test PressurekPa600

12160024003000

Pressure ~ 8 S SPN

36Q

1215

1 Soundness

Each length of pipe of nominal diameter up to 1 400

nun sball withstand withoutleakage

or cracking theinternal hydrostatic test pressures as specified inTab le 4 for t he a pp li ca bl e class when tested in accordance with Annex C. Fo r pipes of nominaldiameter above 1400 11Ull, the frequency o f hydrostatic leak tests shall be as agreed between themanufacturer and the purchaser.

Table 4 Hydrostatic Test Pressures

11.ZFittings.

Made froID Straight PipeThe fitting shin. fabricated from complete pipes orportions of..slJaigbt pipe complying with tbis standard8 s 8 p p l i c a b l ~fortbe pipe classification. The fittingsballc om pl y w it h t he declared design requirements and besuitably mitred. Tb e mitre shall be overwrapped externally and, .if practicable, internally with wovenroving and/or c hopped strand mat to ensure the longitudina Iand circumferential tensile strength is at leastequal by design to tbat of tbe p ipe witb whicb theatti og is to be used.11.3 Fittings Made by MouldingMoulded GRP fittingssball be madeby hand lay-up contact .moulding, h o ~or cold press moulding or tape winding.

11.4 tolerances for GRP Fitt ings,11.4.1 E xc ep t for flanged pipework, wbicb mayrequire closer tolerances, tbe permissible deviationsf rom the slated value of the angle of change ofdirection of a fitting such as a bend, tee or junctionshall not exceed:t 1.

11.4.1 Except for flanged pipework, which may 15 LON(-; TERM H Y Y D R O S l ~ r IU.:SI(;Nrequire closer tolerances, the penuissible deviations PRESSlJRE TESTon the manufacturer s declared length of a fitting,exclusive of the socket where applicable, shall be The pressure classes given in 4.1.1 shall be based on S Run .. ken from tbe point of intersect ion to the long term hydrostat ic design pressure data obtained inend of t h l f i t t i ~ accordance with Annex F and categorized in accord-12 HYDRA tJLIC TEST ance with Table 7. Pressure classes are based on1 .1 General extrapolated strength at 50 years.

1 .1.1 Working pressure P w in the s ys tem shall not 16 TESTS TO ESTABUSH POTABnnY OFexceed tbe pressure class of the pipe, that is, w s WATER

1 .1. When surge pressure is considered tbe max- 16.1 Pipe specimen shall be subjected to tests specifiedimum pressure in the system du e to working pressure. below inorder to establish the suitability of these pipesplus surge pressure, the same shall not exceed 1.4 for usc in car ry ing po tab le water:times tbe pressure class of pipe: i Smell of the extract,

w + P N ~ 1.4 PN ii Cia rity of tbe colour of the extract,NOTE - Special design considerations shall be given iii Acidity and alkality,to sustained pressure surge. iv) Global migration,

v) UV absorbing material,vi) Heavy metals,

vii) Unreacted monomers (styrens), and

viii) Biological tests.16.1.1 Method of preparing extracts for carrying ou tthe tests mentioned in 16.1 is as given below: .

Extracts shall be prepared tor the chemical tests andbiological tests by d ipping in separate beakerspieces of GRP pipes (5 em X 5 em ) such that surface in con tact with the ext ractan ts , p repared asmentioned in 16.1.1.1 and 16.1.1.2, 1 cl n 2 / 2 lUI.The beakers with tbe sample and the ext ractan tsshall be kept at 60:t toC for 2 bours and at40 l 0 C for 24 hours respectively for chemicaland biological tests. The extracts thus preparedshallbe transferred in transparentbottles for carrying ou tthe specified tests, Blanks (extractants only) shallalso be kept in parallel under identical manner, ascontrols.

5


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IS 11709 : 1994

Table S Beam Strength lest Loads an d Longitudinal Tensile S t r e n ~ t hu f Pipe Wall l use 13)

Nominal Diameter Beam Load Minimum tonJ:itudinullcnslic S h \ n ~ l hIn kN/.n ofP Circumference for Pressure l:b,ss .. I

I N k.N PN 3 PN6 PN l I ~ 12 PN 15200 3.6 102 102 1U2 102 102250 5.3 102 102 102 . 102 110300 7.1 102 102 102 112 136350 9.8 102 102 115 131 154400 13.3 102 102 130 14Q 177450 17.8 102 102 138 15Q 185500 19.6 102 102 154 176 205600 28.5 102 123 184 211 246

700 102 140 215 246 280800 102 154 231 265 304QOO 105 174 260 298 341

1000 122 193 290 331 3791 100 127 212 318 363 4171200 140 212 318 363 4311400 164 247 371 423 5041600 185 283 423 484 5741800 206 318 476 545 6462 231 32Q 4Q2 563 6782200 254 36] 541 619 7452400 280 394 5Ql 676 81326 301 427 640 732 88028 ) l . 326 459 690 78t) Q493 347 4Q2 73Q 844 1 016

Table 6 Minimum Hoop Tensile Strength of Pipe Wall lause 14).

Nominal Diameter Mlnlmum Hoop Tensile Strength In kN m Widthn1l11 of.Clrcumference Ior Pressure Class

PN 3 PN 6 I N Q I N 12 PN 1520 t t ~ ~ 244 366 488 fllO250 152 304 456 608 763ft ~ 364 546 728 QIO350 213 426 63Q 852 1065.t )O 243 48 6 72Q Q72 1215450 273 546 819 10Q2 1365500 304 608 Q12 ) 2] 6 1520hOlt 365 730 IOQ5 1460 1825700 425 R50 1275 1700 2125gOO 486 972 1458 1 Q44 243900 547 1 OQ 1641 2 188 2735

I ) K) 608 1 216 1824 2432 30401100 668 1336 2 4 2672 33401200 729 1458 2 187 2916 36451400 851 1 702 2553 3404 4255I 600 972 1 Q44 2 Q16 3888 486I BO O 1094 2188 3282 4376 5472 1215 243 3645 486 60752200 1337 2674 4011 5348 668524 1458 2Q16 4374 5832 72QO26ft 1580 3 J60 4740 632 7

2 NCI J 1 701 3402 5 103 6 X04 N 5053 K O 1 R23 3646 546Q 72Q2 Q 115

6


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16.1.1.1 Extractant for chemical tests specifiedin 16.2 to 16.8 shall be:

a) Double//triple glass distilled water,b) 3 acetic acid m/v prepared in double/triple

glass distilled water,c) 8 ~ethanol v/v prepared in double/triple glass

distilled water, andd) O 9 ~sodium chloride m/v prepared in

double/tripleglass distilled water.16 1 1 Extractant for biological tests specifiedin 16.9 shall be:

a) Double/triple glass distilled water, andb) 0.9 sodium chloride m/v prepared in

double/triple glass distilled water.lahle 7 Long Tenn Hydrostatic Design Pressure

Categories

( Clause 5

16.2 Sme]] of th e ExtractThe extract when examined shall be free from odour.

16.3 Ctarity of th e Colour of th e ExtractThe extract shall be examined visually through testtube for the presence of any colour or turbidity. Theextract shall he free fro III colouring materials andturbidity.16.4 Acidity and AlkalinityThe extract shall be examined for the change of j(using preferably digital-jJH meter) due to migration ofchemical additives. The /JH of the extract shall be tbesante as that of correspondingblank (extractant withouttest piece).

16.5 (;Iobal Migration100 of the extract shall be evaporated in a constantprcwcigbtcd crucible. Total residue in 100 ml of theextract should not exceed 5 lug see also IS 9R45 :1986).16.6 lTV A b s o r b i l ~MaterialsExtract shaI I be examined for the presence of UVabsorbing materials by scanning the samples between220 to 400 nm using double/triple glass distilled wateras blank in spectrophotometer,

PI CSSUrc

Class

3

6

Q

2 5

Minimum Calculated Values or LongTerm Hydrostatic Deslgn Pressure,

kPa

540 8

1620

2 160

2700

7

IS 1 270 9 : 1 99 4

16.7 Heavy Metals

Extract shall be examined for the presence of heavymetals such as Ph, Cd, Mn, Cr, Cu, Co and Zn. Concentrations of Ph, Mn, Cr, Cu, Co and Zn should notexceed t ppm and concentrations o f Cd should notexceed 0.1 ppm.16.8 Unreacted Manomer ( Styrene)The total unreacted styrene concentrations of residualmanomers in the extract should 110t exceed 0.2 hymass of the polymers.16.9 Biological TestsThe extract shall be injected into ten. healthy (niceweighing 20 2 g intravenously and intraperitoneally.Another ten hea Ithy mice shall also be exposed to thecorresponding blank (extrac tant without test piece) and

at the end of fOUT, eight, twelve and twentyfour hours,the mice shall be examined for the symptoms of toxicity.There should be no mortality or gross toxicity symptomsin the animals exposed to the extracts in comparison tothose exposed to blank (extractantonly).

17 SAMPIJING, F R E Q l r E N ~ YAN D CRI fERIAF()R CONFORMITY

The sampling procedure to be adopted and the criteriaforconfonnity shall be as given in Annex G.

8 MARKING

18.1 Both ends of pipe shall be marked witb bold lettersnot less tba n 2 nun in height and in a colour a nd typethat remains legible under normal handl ing and installation procedures. The markings shall include thefollowing:

a) The manufacturer s name or trade-mark,b) The nominal pipe diameter,c) Class of pipe (pressure and stiffness), andd) Batch No. or date of manufacture.

18.1.1 In addition the pipes shall be provided with thefollowing mark on either ends:

18.2 DIS Certttlcation M a r k i n ~Pipes may also bemarked with the Standard Mark.IS.Z.I The usc of the Standard Mark is governed bythe provisions of Bureau of Indian Standards Act, 9Hand the Rules and Regulations made thereunder. Thedetails of conditions under which the licence for the useof Standard Mark may he granted to manufacturers orproducers may he obtained from the Bureau of IndianStandards.


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IS 12709 : 1994

NNEX

lauses 7.1.1.1,7.1.2.1,7.2,7.3 and 7.4.1 )

MEASIJREMENT OF DIMENSIONS

A-) MEASIJREMENT OF DIAMETERSA-I.I Inside DiameterInside diameter shall be measured at 150 mm awayfrom each end of the pipe section using a steel tape oran inside micrometer with graduation of l mm or less.Make two 90 opposing measurements at eacb point ofmeasurement and average the readings.

A-l.2 Outside DiameterA-I.2.1 Outside diameter shall be measured at 150 nunaway from the joint seatingsurface at the outer edge ofthe pipe.A-l.2.2 Principle

The circumference of the pipe is measured and bydividing by 3 142 (n) diameter is obtained.A-I.2.3 Measurement shall be done by ordinaryIlcxible tape or flexible tape suitably.calibrated to readd i a ~ \ < t e r sdirectly. This tape shall comply with thefollowing requirements:

a) it s ha II be made of stainless steel or some othersuitable material.

h) it sha II permit the reading to the nearest 1 nun.c) it shall be graduated in such a way that neither

its own thickness of the graduation bas anyinflucnce on the result of the measuremcnt, and

d) it shall have sufficient flexibility to conformexactly to the circumference of the pipe.

A-I.Z.4 ro edureApply the tape on the whole of the circumferenceperpendicular to the axis.of the pipe.A-2 LENGTHA-2.1 Lengthshallbe measured with a steel tape havinggraduations of 1nun or less. Lay the tape inside the pipeand measure the overall length of tbe pipe.

A-3 SQlrARJ4:NESS OF PIPE ENDA-3.1 Rotate the pipe on a mandrel or trunnions and aSUre tbe runoutof the ends with a dial indicator. Thetotal indicated reading is equal to twice tbe distancefrom a plane perpendicular to the longitudinal axis ofthe pipe. Alternatively when squareness of pipe ends isrigidly fixed by tooling, the tooling maybe verified andreinspected at frequent intervals to ensure that thesquareness of the pipe ends is maintained within thespecified tolerances,A-4 WAlJJ THICKNJ1:SSA-4.1 Measure with a micrometer cal iper or othersuitable thickness measuring device or instrument withgraduation of 0.1 nun or less and tnke a series of fourmeasurements equally spaced around the circumfcrence of the pipe aIter removing the liner whereprovided. These measurements should be taken beforeend joint surface machining is done and some distanceaway front the pipe end. The average of all measurements shall meet or exceed the minimum valuespecified in manufacturer s data sheet.

NNEX

lauses 10.1 and 10.1.1 )

TEST F R PIPE s ~ r I F I 4 N E S S

11 1 I ) R ) < . ~ r ~ D l J R E

8-1.1 Dctcrm'ue the pipe stiffness F / ~ y )at 5 percentvertical deflection for the specimen using tbe apparatusand procedure described in 8-1. , B-l.3 and 8-1.4.0-1.2 The apparatus shall consist of two parallel steelplates between wbich the t es t specimen is placed, and

8

II l anS ofunifonn loading tbepipe with a vertical load see Fig. 2).B-l.3 Load the specimen to5 percent deflection with 2minutes. Record the load.8-1.4 Calculate the pipe stillness using the formula

given in 10 1


16/30


17/30

D-2.5 I ROCEDlJRE

D-Z.S.t Measure the width wand thickness of the pieceat the centre of the gauge length and at points within5 nun of each end of the gauge length. Record theaverage width as wand the average thickness as e

D-Z.2.2 A means of measuring tbe width and thicknessof tbe test piece toan accuracy of 0.1 mm,

D-Z.3Test Pieces

D-2.J.l The test piece shall be strips cut froma pipe inthe longitudinal direction and profiled to the dimensions shown in Fig. 4.A minimum of three test pieces are required.

NOTE - If profile cutting is impractical,parallel-sidedtest pieces of width between 2e and 3e see Fig. 4) shallbe used, where e is the thickness of the test piece.

IS 12709 : 1994

n-Z.4 Test Conditions

Conduct the test at ambient temperature,

DZ.5.ZGrip tbe test piece in tbe testing machine withthe test piece centreline along the loading axis of themachine.D-Z. .3 Load the test piece by separating tbe grips at 8rate to ensure failure occurs between 1 minute and3 minutes. Record the maximum force as

D-Z. .4 Repeat D-Z.5.1 to D-Z. .3 until three resultshave been obtained. Discard any test piece that breaksother than across the neckand testadditiona Itestpiecesunitl three results are obtained.DZ.6 Calculation

. For each test piece, calculate the longitudinal tensilestrength of the pipe per unit circumference T (in kN/ln)using tbe following equation:

-

wwhere

is the failure force in N, andw is tbe width of test piece in mm,

150 max100 min.

R10max.R min

InA.

~

38 max l i s ma x .2emin. 3 o.min.A I

J00t - -- ------ --- d .. i - - - - ~

~ U Y SPACED

I

CENTROID OF GAUGE - ~ ~ 1LENGTH CROSS SECTION

38 maxmin.

THERMOSET RESIN BUILT UP ENOSTRIMMED FLAT AND PARAlLEL

SECTION A A

FlO. 4 STRIP TEST PIECES FOR DETERMlNA110N 9 U ~ i l n J D N A J..TENSILE STRENOnl .

10


18/30

IS 117 09 : 1994

NNEXE lause 14 )

HOOP TENSILE STRENGTH

1:.1 ;ENERAL1 ~ 1 1This method descr ibes the test p rocedu re odetermine the hoop tensile strength of a reinforcedplastics pipe by means of a split disc test.E-Z APPARATUS.:-2.1 A testing machine capable of producing 8progressive rate of separati.on of. th e split. discs toproduce failure of the test piece within 1 minute to 3minutes of initial loading.

E-2.2 Rigid split discs similar to those shown in Fig. 5that make even contact with the internal diameterofthetest piece and that i l l l l n e d i ~ t e l yprior to the test piecebeing loaded are not separated by more than 1 percentof the pipe diameter,.-2.3 A force indicator capable of measuring the forceapplied with an accuracy of 3 percent,E-2.4 A suitable means of measuring the width andthickness of the test piece with an accuracy of 0.1nun.E-JTEST PIECESE-J.l The test piece see Fig. 6) shall be a ring cut froma pipe. The minimum width of the test piece shaII be 8nun: the maximum width is dependent on the methodof .;lanufacklre and the testing equipment available, he width of the test piece shall not exceed the width

of the split disc. A minimum of three test pieces shallbe taken to obtain 8 reliable average result.E-4TEST CONDITIONSConduct tbe test at ambient temperature,E-5 PROCEDITRE

.:-5.1 Measure tbe width thickness of the test piece atdiametrically opposed points.E-S.2 Mount the test piece on the outside periphery ofthe split disc test fixture with the points of measurement

at the split.E-S.3 Load the test piece by separating the mounts at arate not exceeding 2.5 mm min ensuring failure tooccur between 1 minute and 3 minutes and record themaximum force F resisted by the test piece and the timeto failure.E-6 ~ L C I J L T I O N

E-6.1 For each test piece, calculate the apparent hooptensile strength at failure g i in kN/lu from the fol-lowing equation:

F0 0 = -

w

where

= failure load in N); and =width of the test piece i n III .

DIRE TIONOF LO DING

O n THI KNESS J e

. ~

FIG. 5 SPLIT DISC

11

FIG. 6 SPLIT RING TEST PIECE


19/30

IS 117 09 : 4

ANNEXF Clause 14)

LON(; l ERM HYDROSTATIC DESIGNPRESSIJRETEST BY STRESS/STRAINMETHODS

F GENERALF1.1 This annex covers tbe procedure static) for obtaining a hydrostatic design basis for fibre glass pipe byevaluating strength regression data derived from testingof pipes of similar material and construction for thepurpose to establish its pressure rating.For those products wbere no previous longterm hydrostatic testing bas been performed on similar producrs tbefull type testing as described in Metbod A shall beperformed. When a hydrostatic design basis has alreadybeen established for a nomina lIy similar pipe using thesame manufacturingprocess, tbe manufacturer needonlyconduct tbe requaliflcatioutestas describedin MethodB.Fl.1 This practice can be used for the HDBdetenninalion for fibre glass pipe wbere the ratio of outsidediameter to wa thickness is 10 : 1 or more,. -1.3 Specimen end closures in the test methods mayeitherhe restrained or free dependingon the applicationof the pipe. .F-l.3.1 RestrainedEnds

Specimen are essentially stressed by internal pressureonly in the hoop direction and the HOB is applicablefor stress developed only tbe hoop direction.F-I.3.2 Free EndsSpecimen arc stressed by internal pressure in both hoopand longitudlnal directions such tbat tbe boop streess istwice as large as the longitudinal stress. The proceduregiven in this standard are not applicable for evaluatingstress induced by loading where the longitudinal stressexceeds S iff of the hydrostatic design stress.F-2 Df4:FINITIONS14 -2.1 14 ailureWhen tbe test specimen develops a leak, weeps orruptures, itshall be considered to have failed except thatleakage or failure within one diameter of the end closureshall not he considered as failure of tbe specimen.f 4 ~ 2 ZHoop Stress/Hoop Strain

The tensile strl ss/sln,in in tbe circumferential directiondue to internal hydrostatic pressure.)4 2.2.1 The hoop stress shall be calculated by thefollowing ISO equation:

, o II - P D - tr)/2trwberea =hoop stress in kPa;

D = average reinforced outside dl..uierer in tum,P = internal pressure in kPa, and

tr =minimum reinforced wall thickness in mm,1. 2.2.2 HO )J) Strain

The hoop strain shall he calculated by substitutingEHT

= tlll/f. in the ISO equation, given in F-1.Z.1.

12

whereEHT = hoop tensile modulus of elasticity in kPa,

e =hoop strain in em/em, and0/1 =hoop stress in kPa.

F-Z.Z.Z.l Formula for boop strain will tbus be:P - tr 1

- 2 tr X EHTF-2. .Z.1 EHTsball be calculated from tbe equation:

E 2

+ ....EHT -

II +1 2 ...depending upon the layers of the compositewhere 1 and 1 are tbe Young s modulus a nd thethickness of each of the layers of the composite 8 nd t 1 12 is the thickness of tbe rotaI composite.FZ.3 Long Term Hydrostatic Strength (LTHS)The estimated tensile stress/strain in tbe wall oftbe pipein the circumferential orientation du e to internalhydrostatic pressure that will cause failure of the pipeafter 100000 hours of pressure applied continuously.F-2.4 Hydrostatle Design Basis (HDB)Hoop stress/strain developed for fibre glass pipe by thispractice and multiplied by a service design factor toobtain hydrostatic design stress or strain HDS).F-2.S Hydrostatic Design Stress/Strain DDS)The estimated maximum tensile stress/strain in tbe wallof Ihe pipe in tbe hoop orientation du e to internalhydrostatic pressure that can be applied continuouslywith a high degree of certainty that failure of the pipewill not occur.F-2.6 Pressure Rating (When Expressed with Reference to Pipe)TItc estimated maximum pressure that tile medium water) in tbe pipe can exert continuously witlt a highdegree of certainty that failure of the pipe will not occur.F-Z.7 Service Design FactorA number equal to t .00 or less that takes into consideration aU tbe variables and degree of safety involved illGRP piping installation so that wben it is multiplied by.the HDB, an HDS and corresponding pressure ratingis obtained. A safe and satisfactory piping installationresults when good quality components are used and theinstallation is made properly.The service design factor should be selected by thedesign engineer after evaluating fully tbe service conditions and engineering properties of the materials usedintbe manufacturing of pipe. Avalue of 0.555 is recomm n in lieu of any specific information on typicalwater supply systemF-2.8 Reinforced Wall ThicknessThe thickness excluding the liner and the surface layer

tbickness.


20/30

IS 11 709 : 1 94

F-5.4Measurement

FailurePoints

At least 4At least 3

At least 3At least 1At least 18otal

F-5.5.1 Maintain the internal test pressure in eachspecimen corresponding to the selected stress/strain,witbin 35 kPa or within 1 percent of this pressure,whichever is greater. Measure the time to failure witbin 2 percent of 40 hours whichever is smaller, AnaIyzethe test results by using for each specimen, thelogarithm of the stress/strain in kPa/clu/Ctll andlogarithm of the time-to-failure in hours 8Sdescribed in F-II to F-15. Calculate the long termhydrostatic stress/strain at 100000 hours.F-5.5.2 A specimen which leaks within one dian.ererof an end closure may he (1) included as a failure tJoi .if it lies above the 97.5 percent lower confidence limitcurve, (2) repaired and testing resumed provided theleak is more than one diameter from a test joint, or (3)discarded and no failure point recorded.F S S 3 Those test specimens that have been under testfor more than 10 000 hours and had not failed may heincluded 8S failed points ill the calculation proceduresThis may reduce the long tcnu hydrostatic stress/strain.Later, when these samples fail, a ncw long term hydrostatic stress/strain can be established using the actualfailurc time. ~ 5 S 4Determine the final line for extrapolation bythe method of least squares using the failure pointsalong with those non-failure points selected hy themethod described in F -5.5.3. Do not use fa ilure pointsfor stress/strain or pressures that cause failure in lessthan 0.3 b on the average. Determine these points byaveraging the times to failure at tests made at the samestress or pressure level, i.e. a stress within 1 3XO kpaor a pressure within e M kPa. Include in the report nilfailure points excluded from the calculation by thisoperation and identify them as being in this category.F-S.6 Determine suitability of the data for obtainingLTHS of tbe pipe as follows. ,J4 S.6.1 Calculate the lowerconfidence limitof strcss/strainat 000 hours by the methodgiven in F-IZ.

Strain: A minimum of three strain gauges shall bemounted at the pipe test specimen s mid lengtb,oriented in tbe clrcumferenual direction, eachgauge shall have a minimum effective measurement length o f 6.35 nun. Tbe reported hoopstrain shall be the average of the three measuredvalues.

Stress: The stress or pressure values for test sha II beselected to obtain the requisite failure points,

. -5.5 Th e stress/strain shall be selected to obta in failurepoints as follows:

urs

10 to 1 000t 001 to 6 000

After 6000After 10000

F-J SIGNIFICANCE AND IJSE1 .3.1 Procedure for estimating tbe long termhydrostatic stress/strain of fibre glass is essentially anextrapolation with respect to time of tests. Stress/stminat failure versus time plots are obtained.F-3.Z The values obtained by this method are applica ble only to condit ions that duplicate these procedures, It is not likely that long term strength of pipemade by different processes or substantia lIy differentmateriaIs wi II be the same.

NOTE - It has been shown that the resultsobtained fromthis method tend to be conservative when compared toactual service use within thescope of the test method,

F-3.3 The hydrostatic design basis is in accordancewith F-S.F-3.4 Hydrostatic design stress/strain arc obtained hymultiplying hydrostatic design basis values hy II servicedesign factor, given in F-Z.7.F-J.S Pressure rating for pipe of various dimensionsmay be calculated fro III the hydrostatic designstress/strain HDS) va lue detenuined by testing onesize of pipe, provided that the specific process andmaterial are used both for test specimens and the pipein question.F- 4 SIJMMARY F METHOD A

F-4.1 Procedure consists of exposing a minimum of 18specimeus of pipe to constant internal hydrostaticpressures at differing pressure levels in a controlledenvironment and measuring the time to failure for eachpressure level.

F-4.1.1 The long term hydrostatic strength (stress/strain) of pipe is obtained by an extrapolation to438 00 0 hours of a log-log linea r regress ion line forhoop stress/strain versus time to failure, as describedin F-S and HOB in accordance with F-6.Time is treated as the dependent variable in the leastsquare regression analysis.

F-5 I ~ N Gl ERM HYI)ROSTATI : Sl RENGTH(l/THS)

F-S.I The inside environment for the pipe testspecimenshall he water. The outside environment shall be air.Other media may be used, but the environment shall begiven in the test report. The test liquid shall he main-tained within 3 e of the t e l n p e r ~ t u r e1;-5.2 Test at a mbicnt temperatures hetween10C and 43.5C and report the temperature range ex-pericnccd during the tests.

NOTE - Tests indicate no significant effects on the longterm hydrostatic pressurewithin theambient temperaturerange specitied.

1;5.3 Determine the average outside diameter andminimum reinforced wall thickness of each pipe testspecimen in accordance with Annex A.

crr If the test specimens contain an unreinforcedliner determine the wall thickness excluding the liner sothat the thickness recorded is the reinforced wall thickness.

13


21/30

Atleast 3Atleast JAtleast 6

IS 12709 : 1994

. '.5.6.2 If tbe lower confidence value differs from theextrapolated value o f LTHS by more than 15% or the

M calcu la ted in . '1Z is zero or negative or the slope b of the regression line calculated in F11 ispositive,consider the data unsuitable.F ' IIYDR()Sl ATI(: DESIGN BASISF6.l Calculate the LTHS in accordance with F '6.2 Calculate the hydrostatic strength ] , at 50 years(438000 h), as follows:

h =II + blwhere, and b are values calculated as per ....11.3,and = 5.641 5.I 6.3 Obtain HO B from tbe applic-able hydrostaticstrength, as specified below:

i Usc the values calculated in F-6.1, if it is less

than 125 oftbe 50-year value (F.6. ), andii) Usc the value calculated in . -6. , ifit is less tban

RO of LTHS (F.6.1).

F6.4 Determine the HD B category in accordance withTable x

F-7 SlJMMARY()F METHOD nF-7.1 When a piping product has an existing HOBdetermined in accordance to Method A, any significantchange in material, manufacturing process, construction or liner thickness will necessitate a rcqualificationitS described in F-7.2 to F-7 .6 .

7. Obtain failure points for at least two sets ofspeclmcns, each set consi st ing of three or more

specimens testedat thesames t r c ~ 4 \ s t r a i l 1

orpressure level,that is a stress/strain within :t t R kPa/ 0.000 15em/em or H pressure 138 kPa as follows:

Hours to Failure Failure Points{Avcrag o f Set

1010200More than 1 000Total

Include as failure those speclmens which have notfailed a ft er 3 000 hours. Provided they exceed the

existing HOB regression line.)4 '-7.3 Calculate and plot the 95 percent confidencelimit and 95 percent prediction Unlit of the originalregression line ill accordance witbF-13 using onlydataobtained prior to the change.

NOTE - Prediction limit defines the upper and lowerbounds for single observations, whereasconfidence Ii mitdefines upper and lower hounds for the main regressionline,

F-7.4 Consider any changes in material or manufactur-. ing process permissible if the results of F:-7.Z meet tbe

criteria in F-7.4.1, F7.4.Z and F7.4.3 ..

F-7.4.1 The average failure point fo r eachstress/strain or pressure level falls on or above tbe9 7. 5 p er ce nt lower confidence limit of the originalregression line.

F-7.4.1 The earliest individual failure point at eachstress/strain or pressure level falls on or above the 97.5percent lower prediction limit of th e original regressionline.) '7.4.3 The failure point arc distributed about theoriginally determined regres sion line. No more thantwo-thirdof the individual failure points may fall belowthe original regression line.

. ' -7 .5 (Alte rna tlve to F7 .4)

Consider any changes in material or manufacturingprocess permissible if the rcsu Its of F -7.1 meet F -7.5.1and F7.5.1.F 7.5.1 All data points fallabove tbe 97.5 percent lowerconfidence limit of the regression line.F7.5.2 At least two points exceed 3 00 0 hours withoutfailure.

Tahle 8 Hydrostatic Design Basis Categories

Hydrostattc Dt.-sIJ.tn n l l ~ l sCatclCorykPa

1720021700

27600345

43400

552 }689

86200

13R 000172 K

217 OCK276000

14

Runge of Calculated ValueskPa

16500 - 2070020 800 - 26 300

26 400 - 33 ooo33 100 40 Q O

41 000 - 52 Q Kl53 X 65 900

66 o o - 82 90083 000 - 105 900

106 000 - 130 Q()()131 000 16Q Q()()

170 OUO - 20Q 900210000 259 900260 000 - 32 0 000


22/30

).7.6 Data meeting the criteria of F- .4 or F- . mayhe assumed to be part oftbe original data set and a new

regression line and HDB detennined using a failurepoints.

F- .7 If tbe data fails to satisfy tbe criteria ofF-7.4or F-7.S tbe cbanges are considered significant and anew regression line shall be established. Wbile the newtest progra nune is being conducted as per Method A,an interim liDB for the material or process change maybe taken 8S per the lower of F7.7.1 and F7.7. 1..F 7 ~ 7 1The 97.5 percent lower confidence limit of thevalue obtained by extrapolating the failure points ofF-7.Z to 438000 hours by the procedure given in F-6.Z.. 7.7.Z The 97.5 percent lower confidence limit oftbeoriginal regression line at 438 000 hours (50 years).

R H Y D R O S T T I ~DESIGN STRESS/STRAINF-8.1 Obtain the hydrostatic design stress/strain (HDS)by multiplying the hydrostatic design basis (HOB) asdetennined by Method A or Method B, whichever isappropriate by a service (design) factor as recoinmended in . - 1..7.

F - PItESSIJRE RATING

~ 9 1Calculate the pressure rating for each diameterand wall thickness of pipc (see 7.4) from the hydrostaticdesign stress/strain, for the specific material in the pipehy means of the formula

PN= HDS X21r

D - tr)where notations are as defined in F-2.2.

(4 -10 R I ~ ) R T

The report shalll include the following:a) Complete identi fica lion of the samplc , inc lud

ing material type, source, manufacturer s nameand code number, and previous significant history, if any;

b) Pipe dimensions including nominal size,average and luini mu 111 wall thickness andaverage inside/outside diameter, and linermaterial and liner thickness, ifpipe is lined;

~ Test temperature;d) Test environment inside and outside of the pipe

to be kept at ambient temperature;e) A table of time-to-failure, in hours, and cor

responding stress/strain level in k P a / l ~ l n / c l nofall the specimens tested and the nature of thefailures. Spec imens that are designated asfailures a Iter they have been understress/strain for more than 10000 hours shallbe indicated;

f) The estimated long tenn hydrostaticstress/strain (LTHS);

g) The mean stress/strain at long time 5.641 55 andlower confidence value;

IS 11709 : 1994

h) The hydrostatic design basis (HDB);i) The source of the hydrostatic design basis, that

is Mcthod A or Method B;j) Any unusual behaviour observed in the tests;k) Dates of tests; andI) Name of laboratory and supervisor of tests.

F-II LFAST SQlJARES ~ A L : l J I A T I ) N SF()RIJONG TERM STRESS/Sl RAIN

F-11.1The following symbols are used (see also Note):N = Number of points on the tirne-to-failure versus

stress/strain plot;

f = logarithm of failure stress/strain, percent;F= arithmetic average of all f values;

= logarithm of failure time in hours; andH = arithmetic average of all II values.

NOTE - All logari thms are to the base 10. Use 5 placetables for calculations.

. -11.1.1 The equalion of the straight linc is:h = u + b.]

F-II.Z C 1UpUll the three quantities:

U= i:.f 2 -NF J.

V - I II - NH2

W r fh -NFH

F-ll.3 Calculate a and b as follows:b =WIU it lid II = JI - hF

If b is poxitivc. the data arc unsuitable for evaluatingthe utaterial,. -11.3.1 Substirun: these values of 11 and b into theequation n =a + b].Fl1.3.2 Arlutrarily S C I C l ~ tthree convenient values for and cakulntc h for each. The values of I shouldnot be 0 . \ ( /1 too close 10 one another. Plot these threepairs of a 111 .\ lor { and II . If these three pointsdo notlieona straig.lu line, there isa mistakein thecalculations.

FII.3.3 A sample of calculations is given in FlS.

...1 2 CAI.,{ IJI.lATIONS FOR L()WERC O N F I D I ~ N.: I.JMIT

F12.1 LetfJ l ) l H represent thevalue ofthe stress/straincorresponding to 100 nOD hours failure time. Then1100000 . (S - a /IF-IZ.2 The lower confidence value of tbe stress/strainat 100000 hours isgiven by tbe following calculations.

F-12.Z.1 Calculate D := S - H

F-12.2.2 Calculate the variance s2 = 1 I(N - 2)I(V - W2I U) anditssquareroot s , thestandardvariation. F-IZ.2.3 Substitute the value I of Student s t distribution from Table 9 corresponding 10 N-2 degrees offreedom at the two-sided 5 percent level o f significance.

15


23/30

IS 12709 : J

Table 9 StatL itlcal Data

lause

F-12.2.3)

Degree or Student s Ct Degree of Student s t Degree or Student s CtFreedom N-2 Freedom N-Z FreedomN-2

I 1] 706 2 46 2 0129 91 1 98642 4.302 7 47 2.0117 92 1.986 13 3 1824 48 2 0106 93 1.98584 2 7764 49 2. KtQ 6 94 1.985 S5. 2 5706 50 2 0086 95. 1 9853

6 2.446 9 51 2 0076 96 l.Q8507 2 3646 52 20066 Q7 1.984'78 2.306 6 S 2 0057 98 1.Q845

Q 2 2622 54 2.004 Q 99 1 984210 2.228 1

,55 2.004 0 100 I.Q84 0

11 2 2010 56 2 0032 102 1.993512 2 1788 57 2.0025 104 1.983 ()13 2 1604 58 2.001 7 106 1.982614 2 1448 SQ 2.001 0 108 1 982215 2.131 5 60 2.0003 110 1.981 816 2.11Q9 61 l.QQQ 6 112 I Q8t 4

17 2.IOQ 8 62 l.Q9Q0 114 1.981 018 2.100 9 63 1.9Q83 116 1 9806IQ 2 0930 64 I.Q997 118 1 980320 2 0860 65 l .Q97 1 120 1.9799

2.07Q6 6 6 1.9966 J22 1 9796 ~ 2. J73 Q 67 J.9Q60 124 LQ7Q3

23 2 0687 68 I.QQ55 126 1 979024 2.063 Q 69 l.QQ4 Q 128 1 978725 2.05Q5 70 I.QQ44 130 1 9784

26 2 0555 71 I.QQ3 Q 132 1.978.127 2.051 8 72 1.9Q35 134 l.Q77 R

R 2.048 4 73 1.9930 136 1 9776 Q 2 0452 74 l.Q925 138 1.9773

30 2 0423 7S 1.992 I 140 1.977 131 2.03Q5 76 l.QQl 7 142 1 9768

32 2.036 9 77 l QQl 3 144 l Q766

33 2 0345 78 1.9908 146 1.976334 2 0322 7CJ l.QQO 5 148 l.Q76 135 2.030 J 80 l.QQO I ISO 1.9759 .36 2.0281 81 1.9897 2(Kt 1.971 937 2.026 2 82 1.9893 300 1 967938 2 0240 83 1.9890 400 1 965939 2 0227 84 I.Q886 500 1.964740 2.0211 85 1.9883 600 1.963941 2.0lQ 5 86 1.Q879 700 1.963442 ~ O I RI 87 1.9876 800 1.962943 2.016 7 NR 1.9873 900 1 9626

44 I , 4 \ 1.l 87 0 1 ()(KJ 1.962345 2. 11' I QO IltR67

Infinity1 9600

16


24/30

IS l Z7 09 : 1 99 4

F-14.1.3 By Least Square's Theory we know that:

F-14.2 Introducing Eq 7 and 8 into Eq 6 gives:

.......(6)

........(5)

.......... (7)

.......(8)

E (z) = 0

and the variance of z V z is given by:

V (z) fa - F)2 V(b) + V (H)

V H - o2I N

and V (b) - 0 2/ / - F)2 - o21U

where

(J2 = variance of the error in tbe determination of anysingle I, value.

F-12.2.4 Calculate tbe quantity: M - b2 - / 2 i l /UF-12.2.4.1 If eM is negative or zero, the slope of logtime versus stress/strain is not significantly differentfrom zero. In this case, the data are unreliable for theevaluation of the material, The calculations belowshould be carried out only when the value o f M ispositive.F-IZ.2.5 Calculate tbe quantity:

i [bD - tsV DzIU) + MIN) 11MF-12.2.6 The lower confidence l intitof[ 100000 is equalto L + F.

NOTE- There isa 97.5percentproba hiIitythatnewmeanvalue for the regression line will be above the lowerconfidence limi].

4 ~ 3 ~ A I . C I J I A 1 I O N SAND CIJRVE PLOT OF V z ). 0 2 [ fo - F)2 IV + liN)95 PERCENT CONFIDENCE L IMI TS AND 95PERCENT PREDICTION LIMITS F-14.3 The estimate for 0 2 is:

........ (9)

........ (1)

.........(3)

.........(4)

and tbe estimated standard deviation of z is:

....(10)

....(12)

....(13)

.......(14)) , )

(z - E z - 1 V(z)

S 2 . [ l / N - [V - (W2/ U )

l s i {z-E z)} s ~+1

which is equivalent to : .

( {z - E (z)} 2IV (z)] s 12

F-14.6 The limits of the interval are given by:

-S2 { fo-F 2 I U } + (l /N)) .... (11)

which ill view of Eq 5 and 11, becomes:

z2 t ~s2 ( {Vo - F)2 / U) } + liN) (15)

F 4 ~ 7Introducing Eq 4, Eq IS can be written:

[b 1:, - F - ( 0 - H)]2 .,2s2 ( {fo - F) 21U) }+ liN).......(16)

and is evaluated with (N-2) degrees of freedom, couse..quently, an estimate for V (z) is given by:

V z . I N - IV - J2IU ] [{(h, - F) 2I U} + tiN)

)4 i-14.4 The quantity z-E z) /s ; has Student's r-distrihution with (N -2) degree of freedom,

F-14.5 Let t denote the critical value of Student s I, for N-2) degree of freedom and for chosen level of significance. Then the following inequity bold with probability equal to the applicable confidence. coefficient:

(1 - level of signiflcance):F-14 DERIVATI(lN () F FORMITlAS

F- 3.l At any assigned logarithmic value forstress/strain fo ) the 95 percent confidence limits forthe corresponding lograithmic value of time (II c isobtained from:

CL - (tl + bfa) Is ( fo - F)2 IV + l i N ]0.5,NOTE - Curves representing the 95 percent confidentlimits may also be calculated andplotted by repetitionofthe calculation procedures in . ~ - 1 2by substituting variouslogarithmic values for h (given as 5 in F-1Z.1) andreplacing theminussign in the expression for L with aplusor minussigns shown in Eq 18 of F-14.

1 ~ - 1 3 . 2At any assigned l ogar it hmic value ofstress/strain fo) th e 95 percent prediction limits for thecorresponding logar ithmic value of time ( h pL ) isobta ined Irom:

IIPL. (a + bfa) + Is fo - F)2 IV + l iN + 1 15NOTE - 97.5 percent of the expected fa ilures at theselected logarithmic value for stress/strain 10 will occurafter the lower JaPL The average failure time atfo will helonger than the lower tCL 97.5 percentof the time.

F-14.I.Z Then the expected value of z is zero,(beceuse of Eq 3 )

F-14.1 Th e basic equation is :

. ,,=a + hI+ errorwhicb can also be written: - H b - F) + error (2)

F-14.1.1 Consider the assigned value for h) (forexa mple, h =5.0) corresponding to 8 failure time of100 00 0 bourse Denote it by 0 The p ro bl em is toevaluate the uncertainty of tbe corresponding value oThe value of fo is evaluated by tbe equation:

b fa - F Ito - H

; Let z b fo - F) - ( 0 - If

. 17


25/30

and solving Eq 16 for L, we obtain:

bD IS v rb2 - t 2 s2/U /N + D2/ U)L 2 2 2 . . . . . . (18)

b - I . s /V

....14.9 Let M b2 - 2 s2/U ....... 19)

IS J2709 : 1 94

1 14.8 Writing

L - ifo - F) lin - H).........(17a).......(17b)

1;'-14.9.1 Theil, the lower lintit for L is given by :

L P I, bD - tsV Dz/U + MIN ( 0)

ower inut M ... 2

F-14.10 Consequently, inviewoftbe Eq 178, tbelowerlimit for is given by:

[o, Power llmit = Lower limit + FF-1 SAMPlE (:AI.lXJIA110N ACCORDINGTO FIZTypical sample calculations for strain and for s tressmethods arc given in FI . and F 15.2 respectively.

FI . l Strain Method

()ata Point Tlme (hours) Strain ( ) U)M Tlme It) Log Strain if)I 25.Q 1.151 1.41330 0.061 082 34.7 1.125 1.54033 0.051 153 260.4 1.077 2.41564 0.032 224 424 3 1.041 2.62767 0.017 455 95.3 1.028 l.Q7Q OQ 0.011 Q96 157.1 1.027 2.196 18 0.011 577 46.7 0.911 1 66fJ 32 - 0.040 488 124.7 O Q 2 2.095 R7 - 0.044 79Q 766.8 0.885 2.R84 68 - 0.053 06

10 1 064 0.880 3,(l26 Q4 - n.055 52 1013 O 87Q 3.0U561 - 0.056 0112 2770 0.794 3. 44248 - 0.100 1813 12408 0.768 4.0Q370 - 0.1146414 4 Q81 0.747 3.6Q732 - 0.126 6R15 3780 0.706 3.5774Q - 0.15120

16 4427 6QQ 3.646 11 - 0.1552017 28272 0.678 4.451 36 - 0.1687718 16 Q43 0.657 4.228 QQ - 0.182 44

Data Point r /2 r1 1.9Q7 0.003730 L086317

2 2.37262 0.002617 0.078793

3 5.83532 0.001 038 0.077 8224 6.Q0465 0.000 305 0.0458555 3.91680 0.000 144 0.0237356 4.82321 0.000 134 0.025 4107 2.78663 0.001639 ..0.067 577

8 4.39267 0.002006 - 0 .003 880Q 8.321 38 0.002815 - 0 .153 052

10 9.16237 0.003082 - 0 .168 04711 Q.03369 0.003 137 - 0.168 34712 11.85067 0.010036 - 0.34486413 16.75838 0.013 142 - 0.469 29814 13.670 18 0.016048 - 0.468 37315 12.79844 0.022860 - 0.54089916 13.294 12 0.024 187 - 0.567 05417 lQ.R1461 0,(128483 - 0.751 25618 17.884 36 0.033283 - 0 .771 516

I II=51.99208 If= 1.06382 H =2.888 45 F =0.05910 18

11 2. 2 703.175 87 (I/)2 = 1.311 72 I ,,2 165.61745 f 0.168 69 l t =4.22623

18


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IS 1 270 9 : 1 99 4

Step 1:U

0.168 69 - 1.31 t 72/tR 0.105 81V 165.61745 - 2703.17587/18 15.441 02W - 4.226 23 - - 1.063 82 III 51.99208/18

- 1.153 44Step 2:

b = W U - 1.153 44/0.105 81 - 10.900 79a a H - bl 2.88845 - - 10.90079 *0.059 10)

=2.24420

o 2.244 20- 0.096 91 3.300 60- 0.221 85 4.66253

A p lo t o f strain versus t ime on log-log graph paper oro f f versus h on regular graph paper shows that thethree points lie on a straight line, Thus the calculationsare correct.

Step 5 :

Calculate strain at 100 00 0 hours an d at 4 3 8 0 0 0 hours 50 years) from tbe equation in Step 3.

5 2.244 20 - 10.900 79 for - 10.90070 fa 2.755 8 or f = - 0.25281Strain at 100000 hours = 0.558 7

5.641 77 - 2.24420 - 10.900 79 for - 10.900 79 f =3.397 571 or fa - 0.311 68Strain at 50 years = 0.487 9

)4 115.2 Stress Method

CalculatedTillIe hI S)

175.501998

45976

h

Step 3: 2.24420 - 10.90079 *f

Step 4:SelectedStrain )1.00.80.6

lata Point Time hours) Stress kPa) Loll Time Ir Log S t ~ s f1 Q 37415 O.Q5424 4 573 42 13 37415 1.113 Q4 4 573 43 17 37415 1.23045 4 573 44 142 35374 2.1522Q 4 548685 209 35374 2.320 15 4 548686 446 34 13 2.h4Q33 4.531 647 58Q 32635 2.770 12 4 513Q28 6R4 34 13 2 N3S 06 4.531 64Q 12QQ 32635 1.111 hi 4 513Q2

10 1_,01 31 Q72 t l l l 8 4.504 7711 I . ~ 32635 ~ . 1 5 534 4.513 Q212 : I O ~ 32635 3 32284 4.513 Q213 2 :2.,0 29 Q32 3.34R 30 4.476 1314 4 110 31 Q72 3 h1384 4.504 7715 5 184 29 Q32 3 71466 4.476 1316 N QOO 31292 3 Q4Q 3Q 4 4Q543

17 IOQ20 3 612 4.038 22 4 4858Q

18 1234 3 612 4. QI 32 4 48589

Data Point 1J2 /2 fla1 91 57 2 91269 4 363772 1.240 86 2 91269 5 94 9

3 1 514 20.9126Q 5.626 Q )4 4 63235 2 69 49 9.790 085 5.383 Q 2 69 49 1 55362

6 7 1898 2 53576 12.005 817 7 67356 2 37547 12.504 108 8 3757 20.535 16 12 84747Q Q.6Q457 2 37547 14 5458

10 Q.69874 20.2Q2 Q5 14.02Q 1111 Q Q56 17 2 37547 14.242 Q512 11.041 27 2 37547 14 QQQ 0313 11.211 11 2 3574 14 98743

14 13 5984 20.2Q295 16.27Q 5115 13.7Q870 2 3574 16 6273

16 15.59768 2 2 88Q 17 7542

17 16 3 722 2 12321 lR 115 118 16.738 Q ) 20.12321 18 35321

19


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..l2709 : 1994

- 51.487 83 f - 81.364 457 I fl 232.009 SS

I c Ifl3.515 167 f 367.805 14 N =18 I 11 2. 2650.95 I J )2 . 6 620.173 7H = I N =2.860 41 F =fIN =4.520 25

Step 1: f - NF 2 367.805 1 4 . 367.787 13

=0.01771

V =I - NH 2 - 163.515 16 - 147.275 02= 16.240 14

W - f - N - 232.009 953 - 232.735 49=- 0.726 16

Step 2:. W /v - - 0.726 16/0.01771 - 41.00282

tI H - be . 2.860 41 185.343 01 188.203 42Step 3:

H - 188.203 42 - 41.00282 *f

Step 4:

Selected f It Calculated tress (kPa) ime (hrs)30 000 4.477 12 4.628 87 42 54832000 4.505 17 3.47007 3 01034 00 0 4.531 48 2.399 96 251

A p lot of stress versustime on log-log graph paper orof f versus II on regular graph paper shows that thethree points lie on a straight line. Thus, tbe calculationsare correct.

Step S:

Calculate stress at 100 00 0 hours an d at 43 8 00 0 hours. 50 years) from the equation in Step 3.

Period Stress (kPa)100000 bours 29381

50 yea IS 28 342

NNEXG

Clause 17.1 )

SAMPLIN ; AND FllliQIJENC y AND CRrrERIA FO R C()NFORMITY

(;-1 Af:r:EPTANCE rrESTS

;-1.1 One pipe sel ec te d at random fro III a lot see ;.1.1) shall be checked for couformance to thedimensions (7), workmanship (9), stiffness (10), longitudinal strength test (13), and hoop tensile strength(14). Additional tests establishing potability of watermentioned in 16.2, 16.3, 16.5 and 16.8 shall be done asacceptance tests on the sample pipe.

Th e lot shall be declared as conforming to the requirements of this specification, i f the sample pipe meets therequirements of all th e tests, otherwise no t

( ;-1.2. Unless otherwise agreed upon between the purchaser an d the supplier, on e Jot shall consist of 100lengths or part thereof, of sallie pressure class, stiffnessc la ss , a nd size of pipes produced. under relativelyuniform composition and condition of manufacture.

G- 2 TYPE l ESTG-2.1 Sampling for type test is not r equi re d un le ssotherwise agreed upon be tween the manufacturer andthe purchaser. Test certificates shall be furnished whenrequested by the purchaser, for the following:

i Longterm hydrostatic design pressure test (15), andii) Tests establishing potability of water, including

a) acidi ty and alkal inity (16.4),b) UVabsorbing a teria I (16.6),c) heavy metals (16.7), an dd) biological (16.9).

(;-2.2 Type tests sha be performed whenever asignificant change is made in the design, compositionor process of manufacture, Even if no change is envisaged, the frequency of the t yp e test s ha ll he at leastonce in three years.

20


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IS iZ'09 : 1

ANNEXA Foreword

COMMIITEE COM)OSITI()N

Plastic Pipes. nd Fittings SectionsI Committee, CED SO

( r ~ o n l l t U e don page 22 )

ChQinnan

StlRI K. PRABHAKAA RAOMfJIHMrS

SHRI (]ULAM AlfMBD

SHRI S.S. BHANDARI( ~ I B PENOIN8I1R(PPR D)

MATBRIAI.I MANAOBR ( Alternat )( ~ H I B IBNolNBBR(DosloNt)

SUPBRlNTBNDINO BNOrNI1BR(S S)(A lternat )SHRI R. C, ~ U O U D H R V

SHRI M. S. DATrSURI N.N. SHAH Alternate)

DBPlrN CIUBP ENClINBBR

SURJ A. I [JHoNoDBDIRBCTOR (MATBRIALS MANAOBMBNT)

SUPERlNTeNDrNO ENOINEBR (OSSIONS) Alternate)SHRJ R.B. DOCTOR

SHRI R. A. PATBL Alternate)ENUINBBRINO DrRBC10R

CHIBP ENOINBIlR(WPSTBRNReoios Alternate)EXBCl111VB 111RBCTOR

IJVDRAuucENOINBERDBPtm HVDRAUUC ENOINBBR( Altemate )

SHRJ M.S. IDNANISHRI C. P SAntS Altemate)

SHRI V K. JAINSHRI M. K. M, ~ O S H J Alternate)

SHRI K.L. KHANNASHRJ VINAYAJCV. SHBttfBElCARAllemate)

SHRI O.K. LALCHANDANIDR A. P DAS Altemate)

SHRI WIWAM MBNDONBA

SHRI H.D.Y ADAV Alternate)LT C.oL L. P DASIKA

SHRI R. N. SINHA, ABE A terMIc )SHRI K. P NANAVA1Y

DR Y N. SHARMA Itemat. )DR R. PARMASIVAM

SHRlMA S.S. OMAns A l t e r l l Q l ~)DRS. M. PAm.

DR M. K. PANDEY Allemat.)SHRI.5. PRAKASH

OfI lP EN0IN8BR (C)( AlI ma)SHIU RAJBNDRA PRASAD

, StaUJAV KUMAR AltllrM .)

SHRI P S. IWvANSHISHRJ M.S. NARAYANAN Altentflle )

Reprr J tJnliltREngineer-In-Chief'sBranch (Ministry of Defence), New Deihl

Public Heelth Engineering 1..one, Government of KnrnlttRkft

Wavin Indill Ltd, GhAZiftbftdU. P J I N ~ mLucknow

Directorate General of Works, t ~ e n t r f t lPubllc Works Department,New Delhi

Otliceof the { ~ h i e fEngineer, PublicHealth,Bhubanesbwar, OrissaPolyolefin Industries Ltd, Bombay

Public Health Bngineering Department,Governmentof Kerala,Tdvandrum

National Buildings Organlzatlon(Ministry of Works lousing)Delhi Development Authority, New Delhi

Ahmedabad Municipal Corporation, Ahmedabad

Tamil Nndu Water Supply Drainage BOArd, Madras

PVCPipe Development Organization,New DelhiMunicipal Corporationof Greater Bombay, Bombay

Garware Plastics Polyester Ltd, Bombay

Public Health Engineering Department,Governmentof Rajasthan, Jalpur

EPe Industries PvtLtd, Bombay

Central Institute of Plastics Engineering Technology, Madras

The Supreme IndustriesLtd, Bombay

Ministry of Defence, New Delhi

Reliance IndustriesLtd, Bombay

National EnvironmentalEngineering Reaenrch Institute ( SIR). Nagpur

lnititute of Co-operative Management, AhmedAbad

Delhi Municipal Corporation, Delhi

DirectorateGeneral of Supplies and Disposals, New Delhi

Central Public Health . Environment Engineering Organization,(Ministry of Works . Housing)

21


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IS 12709 : 1994

Continuedfrom page 21 )Members

DR P. S. RANSURI K. SllliRAMANIAM Alternate

SURI O. RATRA

DR DHANANJAY RA VSURI H.B. NANIWADEKAR Alternate

REPRESENTATIVESHRJ SI1DBSH KUMAR SHARMA Alternate

DR D. K. SANYALSHRI A.K. BISWAS A ltemate )

SHRI C, K. SHARMASURIMATI SBEMA V A1DVA

SHRJ A. SAMANTA A ltemateSHRJ G. K. SHRlNtVASANDR R. VAIDVANA11fANSHRJJ VSNKATARAMAN

Director Head ~ i v Engg)

Representingijpusing Urban Development C-Orporation Ltd, New Delhi

Building Materials Technology Promotion Council Ministry ofUrbanDevelopment), New Delhi

FinolexPipes Ltd, Pune

Central Building Research Institute SIR , Roorkee

Calcutta Municipal Corporation C-alcutta

RITES,New DelhiGraphite VicarbIndia Ltd Nasik

Vinplex India P) Ltd, MadrasJain Brother Industries,Jalgaon

Director General, BIS Ex-officio Member

Secretary

SHRJ S. S. SsnuDirector ~ i vEngg), HIS

Convener

SURf O. P. RATRA

Members

DR M.S. ALAM

SHRI A. J. J l

DR L. K. REHlSURI D.D. l l Allernate

SIIRI SHAM SUNDER jtABRIA

SIIRI S. PRAKASHSURJ O. GOVALSHRJMAn SEfMA VAIDYA

SHIU A. SAMANTA A lternate )

Panel for GRP Pipesand Fittings, CED 50 : PI

Building Materials Technology Promotion Council, New Delhi

IndustrialToxicology Research Centre, LucknowDirectorate General o f Supplies and Disposals Ne w Delhi

Hind Protective Coating Ltd, New Delhi

Lalit Polymers Electronics,BombayDelhi Water Supply and Sewage Disposal Undertaking, New DelhiCentral Public Works Department, New Delhi Graphite VicarbIndia Ltd, Nasik

22


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Bureau of Indian Standards

BIS is a statutory inst i tut ion established under th e Bureau Indian Standards Act 1986 to p ro mo te tharmonious development o f th e activities of standardization, marking an d quality certification of goodsan d attending to connected matters in th e country. .

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This Indian Standard h as b ee n developed from D o c No . CED 50 5061 .

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is 12709 grp pipes & fittings for potable water supply - specifications

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