REVISION CONTROL SHEET

DOCUMENT TYPE : TECHNICAL SPECIFICATION

NO. : PC-E-274 /Rev No. 0

TITLE : TECHNICAL SPECIFICATION ON

STAINLESS STEEL COMPRESSION TYPE TUBE

FITTINGS

REV. NO.

&

DATE

DESCRIPTION

OF

REVISION

REVISED BY

NAME &

SIGNATURE

CHECKED

BY NAME &

SIGNATURE

REVIEWED

BY NAME &

SIGNATURE

APPROVED

BY NAME &

SIGNATURE



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STAINLESS STEEL COMPRESSION TYPE TUBE FITTINGS

Page 1 of 20

Rev. 0

60614/PC-E-274 MAY, 2009

1.0 SCOPE :

This specification covers the general technical requirements for the design,

manufacture, inspection, testing and supply of stainless steel compression type

(flareless) tube fittings in Instrumentation applications.

2.0 CONTENTS

1.0 SCOPE

2.0 CONTENTS

3.0 APPLICABLE, STANDARDS, SPECIFICATIONS

& DRAWINGS

4.0 MATERIALS PROCESSES

& WORKMANSHIP

5.0 REQUIREMENTS

6.0 INSPECTION AND TESTING

7.0 DOCUMENTATION

8.0 IDENTIFICATION

9.0 PACKING & SHIPPING

ANNEXURE –1 SAMPLE QUALITY ASSURANCE PLAN

TABLE- I DIMENSIONAL TOLERANCES OF TUBE

FITTINGS

TABLE-II DIMENSIONAL TOLERANCES OF SS TUBES

3.0

APPLICABLE STANDARDS , SPECIFICATIONS & DRAWINGS :

All the specifications and standards listed below, of the issue in effect on the date

of the pertinent tendering documents, apply as specified herein. In the event of

any conflict between the provisions of this specification and the documents listed

below, this specification shall govern -

ANSI- B-1.1 Unified Inch screw threads (UN and UNR Thread

Form) equivalent for tube end.

ANSI-B.1.20.1 - Pipe threads, general purpose

ASME Boiler and - Section III, Division I, Sub-Section NB for

Pressure Vessel Code Class -I components



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60614/PC-E-274 MAY, 2009

ASTM-A-213 Standard Specification for Seamless ferritic &

austenitic alloy steel boiler super heater and heat

exchanger tubes.

SA-370 Specification for mechanical testing of steel product

ASTM-A-262 - Standard Practices for detecting susceptibility to

Inter granular attack in austenitic stainless steels

ASTM-A-276 - Standard Specification for Stainless Steel bars &

Shapes.

ASTM-A-314 - Standard Specification for Stainless steel billets and

bars for forging

ASTM-A-473 - Standard Specification for Stainless Steel Forgings

PP-M-107 - Technical specification for Seamless austenitic SS

tubing.

PP-P-198 - General Cleaning & handling requirements for

D2O/helium Services

SAE-J-514 - Hydraulic tube fittings

PB-P-541 - Methods and procedure for seismic qualification of

valves; panels devices; rotating and reciprocating

equipment; tanks, vessels, piping and supports.

PP-P-2014 - Procedure for ultrasonic examination of steel

forgings for general purpose.



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60614/PC-E-274 MAY, 2009

4.0 MATERIALS, PROCESSES & WORKMANSHIP :

4.1 Material, Processes And Parts

Materials, processes and standard parts shall be of good commercial quality and

in accordance with good practices pertinent to the manufacture of high quality

fittings for Nuclear Power Plants. All components of finished product shall have

material traceability

4.2 Workmanship

Workmanship shall be in accordance with high grade commercial practice

adequate to ensure satisfactory operation and service life. Fittings shall be free

from all burrs, loose scales and sliver which might become dislodged in usage

and all other defects which might affect their serviceability. All sealing surfaces

must be smooth to 0.8 microns(max).

No tool marks shall be permitted on the sealing surfaces. On the other surfaces

annular tool marks upto a maximum of 3 microns may be permitted.

5.0 REQUIREMENTS :

5.1 General

The tube fittings shall be capable of continuous satisfactory service over a period

of 40 years with minimum attention. Long term reliability under varying service

conditions is of prime importance and the use of high quality materials,

components, tools, equipments etc. in manufacturing and inspection of these

fittings is therefore required.

5.2 Material Requirements

Straight bodies, nuts and ferrules shall be from SS 316 conforming to ASTM-A-

276. Forgings shall conform to ASTM-A-314 & A-473. These fittings shall be

suitable for use on S.S. 304 L tubing conforming to ASTM-A-213 and NPCIL

specification PP-M-107, but with dimensional tolerances as per Table-II of this

specification.

5.3 Service Conditions

The fittings shall be suitable for the service under the following conditions -



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60614/PC-E-274 MAY, 2009

Process Fluid : D2O/Water, air, hydraulic oil, steam, nitrogen, and helium

Maximum working pressure of process fluid - 200 kg/cm2 (g)

Maximum working temperature - 325oC

5.4 Design and Construction

The compression fittings are those which require no preparation of the ends of the

tube other than that they are cut square, and in which the joint is made by

compression of two ferrules, on to the outside wall of the tube. The design of

these fittings shall be such as to permit tube entry and fitting make up without

removal of the nut and ferrules. All components shall be of the same material as

the fitting body for thermal compatibility and corrosion resistance.

Abrupt reductions of sections shall be avoided. Sharp corners of inadequate

fillets, excessive under cuts or excessive grooves at the junction of small sections

with large sections of fittings shall be avoided.

Unless otherwise specified, each socket shall be provided with an internal

shoulder or stop against which the inserted tube cut square with its axis, shall

abut. Bore-through fittings will not have any internal shoulder.

5.5 Designation of Sizes of Fittings

The fittings shall be designated with the outer diameter of the tube with which

it is to be used.

5.6 Wall Thickness, Overall Dimensions and Pressure Rating

Unless otherwise specified the wall thickness and overall dimensions of fitting

shall conform to SAE-J-514. However, the wall thickness of assembled fitting at

any point shall not be less than thickness established by ASME-Section III, Sub-

Section NB for the required service conditions (pressure and temperature rating).

5.7 Dimensional Tolerances

Dimensional tolerances for the various components of fittings shall be such, that

interchangeability of components of same size of fittings is possible.



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60614/PC-E-274 MAY, 2009

The dimensional tolerances on Internal Diameter (ID)of nut, ferrules and body

are given in Table-I for reference.

These fittings shall be suitable for use with S.S. tubing conforming to ASTM-A-

213 and NPCIL specification PP-M-107. However these tube fittings shall be

suitable for use with tube hardness in the entire range of 65 RB to 80 RB. The

dimensional tolerances of SS tubes proposed to be used with these fittings, are

given in Table-II.

5.8 Hardness

Hardness of the body and nut shall be in the range of RB 70 to RB 90.

Pull out strength, leak tightness, assembly-re-assembly and other performance

requirements covered in Section 6.0 are generally achieved by maintaining proper

hardness values for front ferrule, back ferrules and at the tip portion of the back

ferrule (The ferrule hardness shall not be less than Rockwell-B-90).

Bidder shall justify, how these functional requirements are met in the offered

fittings, indicating hardness values for front ferrules, back ferrules and at the tip

portion of the back ferrule.

5.9 Screw Threads

All Taper Pipe Threads (NPT) shall be in accordance with ANSI B-1.20.1

Straight threads shall be unified screw threads conforming to Class 2A and 2B of

ANSI-B-1.1. Threads conforming to the other standards shall be subject to the

approval of the Purchaser. Silver coating on Nut threads shall be done to avoid

galling during assembly.

5.10 PERFORMANCE

5.10.1 General

These tube fittings must be capable of working with(without leakages or failure)

various fluids (including Helium)at low or high temperature, from vacuum to high

pressures. They should have sealing capacity to hold all fluids as well as gripping

capability to withstand axial, lateral and torsional forces met within industrial

tubing installations.



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60614/PC-E-274 MAY, 2009

All the parts of the fittings should be concentric and should be capable of self-

alignment when assembled with the tubing specified in PP-M-107 Fittings should

not create torque or leave residual strain on tubing. They should have enough

tube support ahead of the seal to resist any vibration. They should not weaken the

tube wall. They should not significantly reduce flow area. They should have a

residual spring condition so that temperature cycling will not cause leakage. The

design of the fittings should be such that they should not require any special tools

for assembly and disassembly of the fittings.

The tube fittings when assembled with the recommended tubes must be capable of

withstanding the following types of forces, in any possible combination :

a) Internal pressure & pressure cycling

b) Tension or axial pull

c) Compression or axial push

d) Torque or twist

e) Vibration.

f) Temperature variation

Any combination of all the above forces is possible.

5.11 Cleanliness

The fittings shall be free from any metal particles, contaminant and other forms of

dirt. Manufacturer shall follow the Purchaser’s instructions specified in PP-P-198

“General Cleaning and Handling Requirements for Instruments and Fittings for

use in Heavy Water and Helium Services”. Failure to meet this requirement shall

result either in rejection or clean-up of all the fittings at the discretion of the

Purchaser. Fittings in the made-up condition shall be suitably heat sealed in

polythene bags and shall be stored in clean storage. Manufacturer shall submit

detailed cleaning and packing procedures along with his bid.

5.12 Lubricants And Sealants

The manufacturer shall specify if any lubricants or sealants are required and give

details of availability, composition, method of use etc. These compounds shall be

Sulphur and halogen free.



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60614/PC-E-274 MAY, 2009

5.13 Installation Procedures

The manufacturer shall provide the recommended installation procedures and the

list of installation tools. A sample copy of the instruction manual shall be

submitted with the bid.

6.0 INSPECTION AND TESTING

6.1 General

The contractor shall be responsible for, and perform all the inspection and testing

specified herein in a manner satisfactory to and subject to the approval of the

Purchaser.

The manufacturer shall supply all the materials required for testing. He shall

prepare and arrange the necessary test pieces and provide the personnel and

equipments for such testing as may be carried out at his premises in accordance

with this Specification. In the absence of such facilities at his works for

conducting the tests, the manufacturer shall, at his own expense, arrange for the

tests to be carried out elsewhere.

The Purchaser or his authorized representative shall have access to the

Contractor’s and Sub-Contractor’s premises at all reasonable times to the extent

necessary to assess compliance with the provisions of this specification. The

Purchaser or his authorized representative shall be offered all reasonable facilities

to satisfy himself that the fittings are being manufactured in accordance with this

Specification.

The Purchaser shall also have the right to conduct at his own expense any

additional inspection or testing deemed necessary by him, to confirm the

compliance with the provisions of this specification.

6.2 Inspection

The fittings shall be inspected to determine conformance with all the provisions of

this Specification with respect to material, workmanship and cleanliness.



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60614/PC-E-274 MAY, 2009

6.3 Tests

6.3.1 General

The Contractor shall notify the Purchaser, the date and location of performing

the tests, giving sufficient notice to enable the Purchaser or his authorized

representative to be present.

The test procedure shall be proposed by the Contractor and approved by the

Purchaser. The contractor shall provide all the test equipments required.

The Purchaser or his authorized representative shall have access to the calibration

certificates of the test equipments used for these tests.

The random samples (around 50 nos.)required for prototype qualification tests

shall be selected by the Purchaser or his authorized representative from the bulk

lot and the samples selected for testing shall not form part of the bulk quantity to

be supplied against the purchase order.

Before performing the test the tube fitting samples shall be assembled with

appropriate S.S. 304 L tubing as per PP-M-107. While making the assembly the

recommended assembly procedure/steps shall be followed.

6.3.2 Prototype Qualification:

If called for in the tender/purchase order, the contractor will manufacture a

limited number of sample fittings of various types and sizes (about 200Nos.)as

prototype fittings and offer to the purchaser for their detailed evaluation. Out of

these, a few (about 50 Nos.)randomly selected fittings of different types and sizes

shall be subjected to all the tests mentioned in section 6.3.3. Subsequently

Prototype fittings of each size shall be subjected to seismic qualification test. The

fitting shall be assembled so as to give unsupported tube length of 0.5 metre and

the seismic vibration tested in accordance with NPCIL Specification PB-P-541,

such that the Test Response Spectrum (TRS) envelops the Required Response

Spectrum(RRS) .

During the test, the assembled fitting shall be internally pressurized to 200

kg/cm2(g), keeping the tube end plugged/crimped.

There shall be no physical damage to the fitting, and no leakage observed during

the seismic test.



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60614/PC-E-274 MAY, 2009

The test setup (.i.e. mounting of assembly on vibration table) and detailed test

procedure shall be proposed by the manufacturer and subject to approval of the

purchaser.

There shall be no physical damage to the fitting, and no leakage observed during

the seismic test.

All the tests will be witnessed by the purchaser’s authorized representative. The

bulk production shall be started only after approval of the prototype fittings by the

purchaser.

6.3.3 Acceptance Tests :

Following tests shall be carried out on each lot of the fittings.

6.3.3.1 Tests on Raw Material

Raw material for body, nut and ferrules shall be tested for physical properties

(i.e. tensile strength, percentage elongation, hardness etc.), chemical analysis,

IGC and ultrasonic tests as per the relevant ASTM standards such as ASTM-A-

276, ASTM-A- 262 and NPCIL specification PP-P-1214. Physical test, chemical

analysis and IGC shall be carried out on the sample from each heat, whereas

ultrasonic test shall be carried out on 100% quantity.

6.3.3.2 Dimensional Checks

The following dimensional checks shall be carried out on 1% quantity of each

size and type of fittings (minimum 5 numbers) randomly selected by the

purchaser from each lot.

a) Complete checks of threads with the appropriate gauges/measuring

instruments..

b) Micrometer check on tool relief diameter.

c) Complete check of various dimensions of all components of fittings .

d) Visual check under magnification of ferrule surfaces, body seats and

threads.

e) Inspection of fittings for any forging imperfections (wherever applicable).



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60614/PC-E-274 MAY, 2009

6.3.3.3 Hardness Test

One body, one nut, one front ferrule and one back ferrule of each size which have

passed the dimensional checks shall be tested to check the hardness to confirm the

requirement as per Section 5.8. These fittings shall not be taken for any other

tests.

6.3.3.4 Pull Out Test

The test is needed to establish that in tube fitting assembly the tension load

required to pull out the tubing out of the fitting, is much more than the force

exerted by rated hydrostatic test pressure. Three fittings of each size from each

lot shall be subjected to pull out test.

The test assembly shall be placed in a tension testing machine. The tension load

on the tube shall be increased at a rate not more than 55 kg/minute. The tension

load required to pull out the tube from tube fitting assembly shall be recorded.

The tension load shall be at least 4 times the force exerted by rated hydrostatic

test pressure. The remaining tests (i.e. tests mentioned in sections 6.3.3.5 thru

6.3.3.12) shall be continued only after successful completion of pull out test and

shall be performed on fresh samples. The failure of pull out test abandons all

further tests and will be a cause for rejection of lot.

6.3.3.5 Hydrostatic Test :

1% quantity from lot of each size of fittings, randomly selected from the fittings

checked for the dimensions and hardness shall be selected for hydrostatic test.

The fittings and their component parts when assembled with SS tubing as per PP-

M-107, shall be subjected to internal hydrostatic test pressure of 300 kg/cm2 (g).

The pressure shall be applied gradually at the rate of 1.5 to 3.5 kg/cm2 (g) per

second and maintained at the test pressure for not less than 10 minutes. No

deformation or visual leakage shall be seen in any of the fittings. The tested fitting

samples shall be dried thoroughly before proceeding for further tests

6.3.3.6 Air Leak Test :

All the fittings which have undergone hydrostatic test shall be subjected to Air

Leak test. The fittings and their component parts when assembled with SS tubing

as per PP-M-107 shall be capable of withstanding an internal air pressure of 7

kg/cm2 (g). The pressure shall be maintained for not less than 10 minutes and the

appearance of bubbles from any fitting when immersed in water, shall cause for

rejection.



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6.3.3.7 Re-assembly Test :

Two fittings of each size from the fittings undergone hydrostatic and air leak tests

shall be subjected to 25 assemblies and re-assemblies with SS-304 L tube as per

PP-M-107.

After every fifth re-assembly, the fittings shall pass hydrostatic test as per Section

6.3.3.5. and air leak test as per Section 6.3.3.6.

6.3.3.8Temperature Cycling :

At least one fitting of each size which has undergone re-assembly test shall be

subjected to three temperature cycles, each of approximately 4 hours duration. In

each cycle, time taken to reach the highest temperature (325oC) from the lowest

(27oC) shall not be less than one hour and not more than 1 ½ hours. Then the

fittings shall be kept at the highest temperature for one hour. The temperature

shall then be brought down to the lowest value in 1 to 1 ½ hours. At the end of

the test, the fitting shall pass the air leak test as specified in Section 6.3.3.6.

6.3.3.9 Pressure Cycling

All the fittings which have undergone temperature cycling shall be subjected to

pressure cycling test comprising of pressurizing to 200 kg/cm2 (g) and suddenly

depressurizing to a pressure of 1 kg/cm2 (g) or less, at a rate of 30 to 100

cycles/minute for minimum 105 cycles. At the end of this test the fitting shall be

subjected to and shall pass the air leak test as specified in Section 6.3.3.6.

6.3.3.10Vibration (Non-Seismic) Test :

The assembled fittings shall be capable of withstanding non-seismic vibration

without any leak or fatigue failure. All the fittings which have undergone

pressure cycling shall be subjected to non-seismic vibration test.

The fittings shall be assembled so as to give an unsupported tubing length of 0.5

metre and subjected to vibrations for at least 5 x 105 cycles in each of two

mutually perpendicular directions. The frequency shall be 25 to 50 cycles per

second and the amplitude of oscillation shall be such so as to stress the tube to

25% of its tensile yield.

The fitting shall be rigidly fixed on a static test platform and the free end of the

tubing shall be subjected to vibrations. During vibration test the tube fitting



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60614/PC-E-274 MAY, 2009

assembly shall be subjected to an internal pressure of 200 kg/cm2 (g). The tube

fitting assembly may be pressurized from tube fitting end, keeping the tube end

plugged/crimped. The amplitude of oscillation shall be calculated based on

actual value of unsupported tube length in the test set up. At the end of this test

the fitting assemblies shall pass the air leak test as specified in Section 6.3.3.6.

The overall test procedure/test set up for this test shall be proposed by the

supplier/vendor and shall be subject to Purchaser’s approval.

6.3.3.11 Helium Leak Test

At least one fitting of each size, randomly selected from the lot of the

dimensionally checked fittings (as per section 6.3.3.2) and all the fittings which

have undergone all above tests upto non-seismic vibration test, shall be subjected

to helium leak test. The helium test pressure shall be 1 kg/cm2 (g). Overall leak

rate shall not exceed 10-6

standard cc/sec.

6.3.3.12 Final Pull Out Test

All the fittings which have undergone the tests mentioned in Section 6.3.3.5 thru

6.3.3.11 shall be subjected to final pull out test as specified in section 6.3.3.4.

6.3.3.13 Inspection And Test Failure

In the event of failure of sample fittings from a lot to meet the inspection and test

requirements specified herein, the entire lot will be rejected and the contractor

shall notify the Purchaser or his authorized representative.

7.0 DOCUMENTATION :

Schedules of submission of various documents by the Contractor are given in

following sections. All the documents shall be signed by the authorized

representative of the Contractor.

7.1 Documents to be furnished by the bidder alongwith the offer

All the documents listed below shall be furnished in triplicate along with the

offer.

a) Detailed technical literature on the offered fittings, indicating various

types, sizes, dimensions, material of construction, service conditions, tests

carried out, installation procedures, applicable standards etc.



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60614/PC-E-274 MAY, 2009

b) List of in-house manufacturing facilities.

c) List of in-house inspection and test facilities.

d) Standard QA plan followed by the bidder in the manufacture of tube

fittings, indicating incoming/in-process and final inspection & testing.

e) Quality Manual of the company.

f) Reference list of the customers to whom similar fittings have been

supplied and operating satisfactorily, indicating quantities supplied,

purchase order reference, order values, scheduled delivery dates and actual

dates of supply.

g) Lists of suppliers/sub-vendors of various materials and components used

in manufacturing of the SS tube fittings.

h) Point wise confirmation on each clause of this specification explaining

how the requirements are being met.

i) Copies of the test reports if the offered fittings have earlier undergone

various tests mentioned in this specification.

7.2 Documents required to be furnished immediately after placement of

Purchase Order

Immediately after placement of purchase order, three copies of following

documents shall be submitted for the Purchaser’s review and approval. The

Contractor shall commence manufacturing/testing of the equipment only after

specific approval of the relevant documents by the Purchaser.

a) General arrangement drawing of each type of fittings indicating overall

dimension, component dimensions and tolerances, material of construction

of each component hardness values, finish etc.

b) Detailed quality assurance plan indicating incoming, in-process and final

inspection and tests.

c) Detailed procedures for all the tests to be carried out on the equipment.

7.3 Documents required to be furnished alongwith the supply



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a) Five copies of all as-built drawings, bill of material as covered in section

7.2 (a) along with their reproducibles.

b) Six copies of operation and maintenance manual giving functional

description, descriptive and illustrative literatures of all the components’

sub assemblies, installation procedure etc. Six soft copies of the same shall

also be supplied in the form of CD/DVD .

c) Six sets of history dockets containing all material certificates/reports and

test reports. Six soft copies of the same shall also be supplied in the form

of CD/DVD.

In addition to the above, the manufacturer shall supply in triplicate,

certificate of compliance stating that the material supplied is in accordance

with all the provisions of this specification.

8.0 IDENTIFICATION : Each fitting shall be individually packed in a cellophane

bag along with an identification slip bearing the part number of the fitting.

Fittings of each type and size shall be packed in separate packages. All the

packages shall be clearly and legibly marked in suitable permanent manner with

the following information :

a) Purchase Order Number of the Purchaser

b) Item number of the Purchase Order

c) Details of the fittings and quantity of each type of fittings in the packages

9.0 PACKING & SHIPPING :

The Contractor shall make adequate provisions to protect the fittings supplied to

this Specification to ensure that, on arrival at the generating station or elsewhere

as may be advised by the Purchaser and after storage as may occur, they will not

have suffered corrosion, damage, or deterioration of any sort. The threads of all

the fittings shall be protected with suitable plastic caps/plugs. The packing shall

be suitable for tropical climate.

In no case will the supplier ship the material without obtaining written permission

or shipping release from the buyer or his authorized representative. Material shall

be shipped only after completion of all inspection and test formalities.



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TABLE - I

DIMENSIONAL TOLERANCES OF TUBE FITTINGS

DIMENSIONAL TOLERANCES OF TUBE FITTINGS IN METRIC SIZES

Size of

Fittings (Tube

O.D.)

Nut

ID

mm

Front ferrule

ID

mm

Back ferrule

ID

mm

Body

ID

mm

3 mm. 3.20

3.13

3.20

3.13

3.20

3.13

3.20

3.13

6 mm. 6.20

6.13

6.20

6.13

6.20

6.13

6.20

6.13

10 mm. 10.20

10.13

10.20

10.13

10.20

10.13

10.20

10.13

12 mm. 12.20

12.13

12.20

12.13

12.20

12.13

12.20

12.13

16 mm 16.22

16.15

16.22

16.15

16.22

16.15

16.22

16.15

18 mm. 18.22

18.15

18.22

18.15

18.22

18.15

18.22

18.15

20 mm. 20.22

20.15

20.22

20.15

20.22

20.15

20.22

20.15

25 mm 25.22

25.15

25.22

25.15

25.22

25.15

25.22

25.15

DIMENSIONAL TOLERANCES OF TUBE FITTINGS IN INCH SIZES

Size of

Fittings (Tube

O.D.)

Nut

ID

mm

Front ferrule

ID

mm

Back ferrule

ID

mm

Body

ID

mm

1/8 (0.125) 0.133

0.130

0.133

0.130

0.133

0.130

0.133

0.130

1/4 (0.250) 0.258

0.255

0.258

0.255

0.258

0.255

0.258

0.255

1/2 (0.500) 0.508

0.505

0.508

0.505

0.508

0.505

0.508

0.505

5/8 (0.625) 0.633

0.630

0.633

0.630

0.633

0.630

0.633

0.630

3/4 (0.750) 0.758

0.755

0.758

0.755

0.758

0.755

0.758

0.755

1"(1.000) 1.010

1.007

1.010

1.007

1.010

1.007

1.010

1.007



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TABLE- II

DIMENSIONAL TOLERANCES OF SS TUBES

DIMENSIONAL TOLERANCES OF SS TUBES (METRIC SIZES)

Outside dia (mm) Wall thickness (min.)

(mm)

Tolerances on O.D. (mm)

3 1.0 -0.00 + 0.10

6 1.2 -0.00 + 0.10

10 1.2 -0.00 + 0.10

12 1.5 -0.00 + 0.10

16 1.8 -0.00 + 0.12

18 2.1 -0.00 + 0.12

20 2.5 -0.00 + 0.12

25 3.0 -0.00 + 0.12

DIMENSIONAL TOLERANCES OF SS TUBES (INCH SIZES)

Outside dia inch Wall thickness (min.) inch Tolerances on O.D. inch

1/8 0.018 -0.000 + 0.002

1/4 0.049 -0.000 + 0.004

3/8 0.035 -0.000 + 0.004

3/8 0.049 -0.000 + 0.004

1/2 0.065 -0.000 + 0.005

5/8 0.065 -0.000 + 0.005

3/4 0.095 -0.000 + 0.005

7/8 0.095 -0.000 + 0.005

1 0.109 -0.000 + 0.005



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ANNEXURE-I

11. SAMPLE QUALITY ASSURANCE PLAN FOR STAINLESS STEEL COMPRESSION TYPE (FLARELESS) TUBE FITTINGS

SL.

NO.

1

COMPONENT/

OPERATION

2

CHARACT-

ERISTIC

3

TYPE

OF

CHECK

4

CLASSIF-

ICATION

5

QUANTUM

OF CHECK

6

REFERENCE

DOCUMENT

7

ACCEPTANCE

NORMS

8

FORMAT

OF

RECORD

9

AGENCY

(P)(W)(V)

10

REMARK

11

1.0 RAW MATERIAL

Material for

body, nut &

ferrules

Chemical

Composition

Chemical

Analysis

MA

Sample from

each heat

Applicable

standards

Applicable

Standards

Test Report

3 2 1

To be done

in NPCIL

Approved

Lab

Non destructive

examination

Ultrasonic

Test

MA

100%

As per

PP-P-1214

ASTM

Standard

Test Report

3 2 1

To be done

in NPCIL

Approved

Lab

Physical

properties

Tensile

Strength

Hardness &

IGC Test

MA

Sample from

each heat

Applicable

standards

Applicable

Standards

Test Report

3 2 1

To be done

in NPCIL

Approved

Lab



ON


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SL.

NO.

1

COMPONENT/

OPERATION

2

CHARACT-

ERISTIC

3

TYPE

OF

CHECK

4

CLASSIF-

ICATION

5

QUANTUM

OF CHECK

6

REFERENCE

DOCUMENT

7

ACCEPTANCE

NORMS

8

FORMAT

OF

RECORD

9

AGENCY

(P)(W)(V)

10

REMARK

11

2.0 IN PROCESS/ROUTINE TEST

2.1 Checks on

Components

Threads Check Gauging MA 100% Manufact-urer’s

drawings

Manufact-urer’s

drawings

IQC Records 2 2 1

Dimensional

check on body,

nut, front

ferrule and back

ferrule

Measur-

ement

MA 100% Manufact-urer’s

drawings

Manufact-urer’s

drawings

IQC Records 2 2 1

2.2

Assembled

Fittings

Finish Visual MA 100% Manufact-urer’s

drawings

As per NPCIL

approved

drawing

Test Report 2 2 1

Overall

Dimensions

Measur-

ement

MA 100% Manufact-urer’s

drawings

As per NPCIL

approved

drawing

Test Report 2 2 1

3.0

ACCEPTANCE TEST

3.1 Body Dimensional

check

Measure-

ment

MA 2% of the lot NPCIL

approved

drawings

NPCIL approved

drawings

Test Report

2 1 1

Hardness Hardness

Test

MA 1 sample from

each lot

As per 4.8 of

PP-E-577

As per 4.8 of PP-

E-577 and plant

standard

Test Report 2 1 1

3.2 Nut Dimensional

check

Measure-

ment


approved

drawings

NPCIL approved

drawings

IQC Records 2 1 1



ON


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SL.

NO.

1

COMPONENT/

OPERATION

2

CHARACT-

ERISTIC

3

TYPE

OF

CHECK

4

CLASSIF-

ICATION

5

QUANTUM

OF CHECK

6

REFERENCE

DOCUMENT

7

ACCEPTANCE

NORMS

8

FORMAT

OF

RECORD

9

AGENCY

(P)(W)(V)

10

REMARK

11

Hardness Hardness

Test

MA 1 sample per

size from each

lot

As per 4.8 of

PP-E-577

As per 4.8 of PP-

E-577 and plant

standard

Test Report 2 1 1

3.3 Front Ferrule Dimensional

check

Measure-

ment


approved

drawings

NPCIL approved

drawings

IQC Records 2 1 1

Hardness Hardness

Test

MA 1 sample per

size from each

lot

As per 4.8 of

PP-E-577

As per 4.8 of PP-

E-577 and plant

standard

Test Report 2 1 1

3.4 Back Ferrule Dimensional

check

Measure-

ment


approved

drawings

NPCIL approved

drawings

IQC Records 2 1 1

Micro Hardness Micro

Hardness

Test

MA 3 samples per

size from each

lot

As per 4.8 of

PP-E-577

As per 4.8 of PP-

E-577 and plant

standard

Test Report 2 1 1

3.5 Assembled

Fitting

Dimensional

check

Measure-

ment

MA 2% from each

lot

NPCIL

approved

drawings

NPCIL approved

drawings

IQC Records 2 1 1

3.5.1 Assembled

Fitting

Tension pull out

test

Perform-

ance

MA 1 fitting from

each size

As per 6.3.3.3

& 6.3.3.12 of

PP-E-577

NPCIL

Approved Test

Procedure

Test Report 2 1 1

3.5.2 Assembled

Fitting

Material

integrity and

strength

Hydro-static

Test

MA 1% of fitting As per NPCIL

approved test

procedure

As per NPCIL

approved test

procedure

Test Report 2 1 1

3.5.3 Assembled

Fitting

Leak tightness Air Leak

Test

MA 1% of fitting As per NPCIL

approved test

procedure

As per NPCIL

approved test

procedure

Test Report 2 1 1



ON


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SL.

NO.

1

COMPONENT/

OPERATION

2

CHARACT-

ERISTIC

3

TYPE

OF

CHECK

4

CLASSIF-

ICATION

5

QUANTUM

OF CHECK

6

REFERENCE

DOCUMENT

7

ACCEPTANCE

NORMS

8

FORMAT

OF

RECORD

9

AGENCY

(P)(W)(V)

10

REMARK

11

3.5.4 Assembled

Fitting

Reusability Re-assembly

Test

2 fittings from

each size

As per NPCIL

approved test

procedure

As per NPCIL

approved test

procedure

Test Report 2 1 1

3.5.5 Assembled

Fitting

Performance Temper-

ature cycling

test

MA 1 fitting from

each size

As per NPCIL

approved

procedure

As per NPCIL

approved

procedure

Test Report 2 1 1

3.5.6 Assembled

Fitting

Performance Pressure

Cycling Test

MA 1 fitting from

each size

As per NPCIL

approved

procedure

As per NPCIL

approved

procedure

Test Report 2 1 1

3.5.7 Fitting Assembly Performance Non-

Seismic

Vibration

MA 1 fitting from

each size

As per NPCIL

approved

procedure

As per NPCIL

approved

procedure

Test Report 2 1 1

3.5.8 Fitting Assembly Performance Seismic

Vibration

Test

MA 1 fitting from

each size

As per NPCIL

approved

procedure

As per NPCIL

approved

procedure

Test Report 2 1 1 To be

carried out

only on

prototype

fittings

3.5.9 Fitting Assembly Leak Tightness Helium

Leak Test

MA Quantity as per

Clause

6.3.3.11

PP-E-577

As per NPCIL

approved

procedure

As per NPCIL

approved

procedure

Test Report 2 1 1

3.6 Fittings Packing

& Dispatch

Final Assembly Visual MA 100% As per NPCIL

approved

specification

Approved

procedure

-- 2 1 1

LEGEND :

P = Performed by. V=Verified by 1. NPCIL

W = Witnessed by. MA=Major 2. Manufacturer 3. Third Party

npcil tube fitting specifications

Documents