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Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.

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“Invent a New India Using Knowledge”

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“Step Out From the Old to the New”

“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan

“The Right to Information, The Right to Live”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

“Invent a New India Using Knowledge”

है”ह”ह

IS 3281 (1966): Dimensions for mushroom ventilators withfixed head-welded type [TED 17: Shipbuilding]

IS : 3281.1966

lndian Standard

DIMENSIONS FOR MUSHROOM VENTILATORS WITH FIXED

HEAD -WELDED TYPE

Marine Engineering and Shipbuilding Sectional Committee, EDC 56

Chairman Rcpresmtin~

REAR-ADM T. B.‘BosE Jayanti Shipping Co Ltd, Calcutta

tiambars CAPT P. ALEXANDEE The Company of Master Mariners of India, Bombay

CAPT P. S. VANCHI~WAB ( Alkmate ) SHRI F. V. BADAMI Directorate General of Technical Development

( Ministry of Industry & Supply ) Snap K. BAME~JEE Bonar Bros & Co. Calcutta SRRI P. R. DAVE Alcock Ashdown & CoLtd~Bomb~y DI~ECTOB OF MARINE ENOI- Indian Navy

NEERINo DIEECT~B OB NAVAL CONS-

TRUCTZON (Alternate ) SARI M. J. GODI~ALA Hindustan Shipyard Ltd. Visakhapatnam SBRI F. D. GOMES Scindia Workshop Ltcl, Bombay

SHRI T. A. SBAIKH (Alternate ) ’ Sam B. K. GUPTA Directorate General of Shipping ( Ministry of Trans-

CAPT GUESABAN SINCJH

SBRI B. HILL SSBI G. CODD I Alternate )

port ), Bombay Directorate General of Shipping ( Ministry of Trans-

port ), Bombay Lloyd’s Register of Shipping, Calcutta

S&S. K~AaTHUBI’ ~~ ’ Institution of Marine Technologists, Bombay SHBI K. N. G. MENON ( Affrrnafc )

SEBI KIBPAL SIN~H The Indian National Steamship Owners’ Association, Bombay

SHBI S. Y. K~TWAL Siemens Engineering and Manufacturing Co of India Ltd, Bombay

SHZU J. L. A~ARWAL ( Alfanalc) SHEI B. L. MANDXU~ Kirloskar Oil Engines Ltd, Poona SHBI A. MATTERSON AFCO Ltd, Bombay

SHBI V. G. DAMLE ( Alternate ) SHBI SHABEEP MOLOOBHOY SHBI K. PABTHA~ABATHY

Ahmed S. Moloobhoy 8: Sons, Bombay Directorate General of Shipping ( Ministry of Trans-

port ), Bombay SHBI J. G. PATELL Garden Reach Workshops Ltd, Calcutta

SEBI EDWABD RAJABATNAU ( Al tcmatc ) ( Continued on page 2 )

INDIAN STANDARDS INSTITUTION MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARC

‘X,< NEW DELHI 110002

( Continued from /sap I )

Membm Reprecenting SHBI 8. K. PAUL

SHRI A. SIN~R ( Al&mote) slut1 v. s. s. RAMA RAO

SHBI J. K. SIP?Y ( Akmatr ) SEEI T. M. SAWRAVI SEEI SPDNHY G. SC%AIWXR Snm D. S. SHETII SHZU B. S. SaoD

SHBI M. Sunrooa ( Al*ma& ) SRIU M. Vle~o

The Commissioners for the Port of Calcutta

Rivers Steam Navigation Co Ltd, Calcutta

The Imcitute of M&ne Eq@ecrs, Bo&ay American &rcau of Sbippiag, Burubay Hindustan Shi yard Ltd, Vb;Jthp#8un Bombay Port rust, Bombay f

Central Institute of Fisheries Technology, Ernakulam

SHEI B. D. WADIA SHRI K. A. falrl~r ( Altematr )

SEBI M. V. PATAXKAR, Deputy Director ( Mech Eng )

The Shipping Corporation of India Ltd, Bombay

Director, IS1 (Ex-ofiio Member) sEcr#t~y

SBBI K. S. SUBRAMANIAY

Officer on Special Duty ( Mech Eng ), ISI

Piping and Ventilation Subcommittee, EDC 56 : 2

Convener

Sam K. PABTHA~A~ATH~ Directorate General of Shipping ( Ministry of Trans- port ), Bombay

Members SHRI K. K. BAXBBJEE Hindustan Shipyard Ltd, Visakhapatnam

SRRI S. .K. RAJA~OPALAN ( Altcmote)

Saab P. R. DAVIC Alcock Ashdown & Co Ltd, Bombay DIRECTOR OP NAVAL CONSTXUC- Indian Navy

TION

GENERAL MANAGER Rivers Steam Navigation Co Ltd, Calcurta DR T. S. RA~ZIURAM Mazagaon Dock Ltd, Bombay

SHRI H. C. SI~TENA ( Alternate ) SHRI T. M. SAN~RAVI The Institute of Marine Engineers, Bombay SH~I SYDNEY G. SOHAE~ER American Bureau of Shipping, Bombay SEXI R. P. WANKADIA Scindia Workshop Ltd, Bombay

Panel for Ventilation, EDC 56 : 2 : 2

Conuew

SZXIU K. PABTB~~A&ATI~Y

MtdUS

DIRE~TOI~ OP NAVAL COR~TBUC- TION

G~NZBAL MAXAQ%~ SERI S.. K. RAJ~PALA~

Directorate General of Shipping ( Mix&q of Trans- port ), BombsY

Indian Navy

Rivers Steam Navigation Co Ltd. Calcutta Hindustan Shipyard Ltd, Visakhapatnam

2

X$:3281-1966

Indian Standard

DIMENSIONS FOR MUSHROOM VENTILATORS WITH FIXED

HEAD - WELDED TYPE

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institu- tion on 14 January 1966, after the draft finalized by the Marine Engineering and Shipbuilding Sectional Committee had been approved by the Mechanical Engineering Division Council.

0.2 This standard is one of a series of Indian Standards dealing with mushroom ventilators. Other standards in the series are:

IS : 3279-1966 General requirements for mushroom ventilators

IS : 3280-1966 Dimensions for mushroom ventilators with adjustable head - welded type

IS : 3282-1966 Dimensions for mushroom ventilators with adjustable head - cast iron type

IS : 3283-1966 Dimensions for mushroom ventilators with adjustable head - cast iron type with provision for passage of light

0.3 Indian Standard general requirements for mushroom ventilators ( IS : 3279-1966) is a necessary adjunct to this standard.

0.4 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expres- sing the result of a test, shall be rounded off in accordance with IS : 2-l 960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

1. SCOPE

1.1 This standard specifies the dimensions for mushroom ventilators with fixed head -welded type.

2. D-1ON

2.1 This type of ventilator consists of a fabricated mushroom head and the coaming to which the head is fixed by means of bolts or screws.

*RUINS for rounding ofI’ numerical values ( ~roisrd ) .

3

Ist3281-1366

2.2 The heads are of two types, namely, A and B.

3. MATERIAL

3.1 The materials of various parts of ventilator shall be as given in IS : 3279.1966*.

4. DIMENSIONS AND TOLERANCES

4.1 The dimensions of Type A and Type B heads with coaming shall be as given in Table 1 and Table 2 respectively.

4.2 The tolerances on the dimensions of the various parts of mushrpom ventilators shall be according to the relevent Indian Standards, where available.

4.2.1 The tolerances on all other dimensions shall be according‘td the coarse series of IS : 2102-1962t.

5. DESIGNATION

5.1 The mushroom ventilator with fixed head i welded type shall be designated by the name, type, the nominal size and number of this standard.

Example:

A mushroom ventilator with fixed head -welded. type having a nominal size of 150 mm, conforming to this standard shall be designated as:

Mushroom Ventilator with Fixed Head -Welded Type 150 IS : 3281

tliecommendationa for machining deviations for diicnsions without specified tolerances. ! Since revised ).

4

TbLE 1 DIMENSIONS FOR TY?B A HEAD OP MUSHROOM VENTILATORS

(‘clotcar4.1) .’

All. dimcmioxu in milliitrcs.

loox4THCt4 MS FLAT ALL-ROUND WElDEDTO HEAD /

HEX HO SCREWS EQUALLV SPACED /

/

- d2 - I-

I

-d-

HALF 0 BAR

L 50x25~6 FLATS WELDED OVER COAMING IN WAV

:ws

NOMINAL d TRICK- DIA OF No. DIA

cl (2a) (hd) (0%) (Ohi) (O&d) (O.h;sd) (0?5d) (0?5d) (O%d) (Ot&l) (2) (l$) (O.:d) NESS OF MS

SUEET Scasws S% Bws

iii! 300 400 250 188 100 75 113 :ii

112 84 113 150 zi 90 67 zi 120 160 800 600 225 300 24 32 2.0 Ml0 Ml0 t 250 500 313 125 140 188 63 113 75 200 loo0 375 40 22:; Ml0 4 % 600 700 437 375 175 150 f:: E 225 263 ;: 158 135 105 90 240 280 1200 1400 450 525 48 56 $5 Ml6 Ml0 4

400 800 500 200 224 300 180 120 320 1600 600 64 Ml6 2 g 1% 5% fE

E 253 280 338 375

z 225 203 135 360 1800 375 675 750 8o 72

;:; 125 Ml6 Ml6 6

550 1 100 687 275 413

E

413 138 248 :;t :z ‘2:: a25 88 ‘2’: * Ml6 t

600 1200 750 300 :z 450 :R 270 180 480 2400 900 96 ;:8” Ml6 700 1400 875 350 392 525 315 210 560 2800 1050 112 Ml6 :

800 1600 1000 400 600 448 600 200 360 240 640 3200 1200 128 Ml6 H 900 1 800 I 125 450 675 504 675 225 270 720 3600 1350 144

;:; Ml6

i

1000 2 000 1 250 500 560 750 250 % 300 800 4000 1500 160 M20 12 t 1 100 2 200 1 375 550

Is 616 825 275 495 330 880 4400 1650 176

;:; M20 12 3

1250 2 500 1562 625 *g38 938 313 563 375 1000 5000 1875 ‘200 2.8 M20 12 - 1400 2800 1750 700 1050

:z 1050 350 630 420 1120 5600 2 100 224 M20 12 :,

1600 3200 2000 ‘800 1200 898 1200 400 720 480 1280 6400 2400 256 22:; M20 12

.

al

NOIUXALDIA

d

15020025030035040045050055060070060090010001100125014001600

b

24242430303030303036.%S636M48484846

( Cfuure4.1 )

All dimensions in millimetrcs.

~ :-

/’ ~d—+

COAMING/MS BRACKETS

(A)

26.335043852561370078a875963

10501225140015751750I8252 18s24502s00

(ltd) (Oh)

1802#300360420460540600660720840960

1060J200.1320150016801920

6080

100120140160

E220240280320360m440500560640

( Okd)

45607590105120}35150165160210240270300.33037542LI480

k, TIiIOXNEW No. OFor SIISET BItAOXETSAMD MSBUCKm

20 330 3

3: 460 470 480 430 4100 460 675 690 6105 6100 8115 8130 8160 8190 8

s sets3sets3sets4sets4sets4ScL$4Sets4Seu4sets6Sets6Sets6sets6SetJ8Sets8SeW8Sets8Sets8Sets

p*T

M8M8MSMloM1OMIOM1OMIOMIOM12M12M12M12M16M16M16M16M16.

No. OSBOL~

666888888[a1818182424242424

i

I

No. OF

DBILLED IHOIJUIOliEAOH

BaAcxm

22 i22,222 122

I