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है”ह”ह

IS 6838 (1973): Dimensions for 'O' rings and grooves forvacuum flanges [MED 17: Chemical Engineering Plants andRelated Equipment]

1s : 6838 - 1973

Indian Standard DIMENSIONS FOR

‘ 0’ RINGS AND GR-OOVES FOR VACUUM FLANGES

Chemical Engineering Sectional Committee, EDC 57

Chairman Representing

DR 0. P. KHARUANDA Larsen & Toubro Ltd, Bombay

Members

SrraI S. S. RAO ( A[lernale to Dr 0. P. Kharbanda )

SHKI A. I<. I:ASU Indian Institute of Chemical Engineers, Calcutta PROF G. S. R. NARASIMAHAUURTY ( Alternnle )

SHRI S. D. BlfAsIN Imperical Chemical Illdustries ( India ) Private Ltd. 1 7 Calcutta

SIIRI :,. SEN GUPTA ( Alternate ) SIIRI A. K. Bose Directorate=General of Technical Dcvrlupment, NW

Delhi SIIRI A. B. MAUICK ( ALternate )

SIIRI 1’. K. CHAKRAVARTY Directorate General of Supplies & Disposals, New Delhi

Fertilizer Association of India, New Delhi Burmah-Shell R-cfincries Ltd, Bombay

DK K. S. CIIARI SHRI I<. SADAGOLJA CIIARI

SHRI S. I,. ARANHA ( Alternate ) DR L. I<. DORAISWAMY

SHRI 1:. S. GROVER SIIRI B. D. MELLO ( Aflernale )

DR H. K. JOSHI

SHRI K. Cl. JAIN ( Al/ernafe ) PROF N. R. KAMATH

Srrar K. A. NAIK ( Alfemale ) SHRI J. P. KAPCR

DR R. K. GUPTA ( Alteruate )

Coun;Flh;f Scientific and Industrial Resrarch, New

Ralph M. Parsons Co of Asia, Bombay

IndianQil Corporation Ltd ( Rcfmerirs Division ), New Delhi

Indian Institute of Technology, Bombay

Indian Chemical hlanufacturers’&sociation, Calcutta

Indian Institute of Petroleum ( CSIR ), Dchra Dun Da M. G. KRISHNA SHRI H. K. MULCHANDANI ( Alfernafe )

SHRX K. MANIVANAN Directorate of Industries, Government of Haryana, Chandigarh

( Conlinucd on page 2 )

@ Copyright 1973

IIYDIAN STAND.\RDS INSTITUTION

This publication is protected under the Indian Copyright Act (XIV of I957 ) and reproduction in whole or in part by ?ny f”eans except with written permission of the publisher shall be deemed to be an mfrmgement of copyright under the said Act.

IS t 6838 - 1973

( Confinuedfiom page 1 )

Mrzbers

SHRI B. B. MATHUR SHRI I. B. LAL ( Alternate)

SHRI R. C. MISRA SHRI K. C. MOHAN

kepnscntitig

Delhi Cloth & General Mills Co Ltd, Delhi

Heavy Electricals ( India ) Ltd, Bhopal Hindustan Steel Ltd, Ranchi

SHRI C. N. KHASTACIR ( Alternate ) SHRI K. MUKHERJEE Walchandnagar Industries Ltd, Bombay SHRI P. K. PA1 Esso Standard Refining Co of India Ltd, Bombay

SHRI B. S. R. ANJANEYWLU ( Alternate) SHRI R. PRABHAKAR Tata Chemicals Ltd, Mithapur

SHRI S. N. BHATTACHARYA ( Alternate ) SHRI R. V. RAOHAVAN Vijay Tanks & Vessels Pvt Ltd, Bombay SHRI B. S. RAJPAL

SHRI P. G. BHANDARI ( Alternate) DESMET ( India ) Pvt Ltd, Bombay

SHRI A. P. RAO Bharat Heavy Plate and Vessels Ltd, New Delhi SHRI M. VENKATARATNAM ( Alternate )

SHRI D. G. RAO Fertilizer Corporation of India Ltd, New Delhi SHRI A. DUTTA MAZUMDAR ( Altcmate )

SHRI H. S. RAO SHR~ J. N. GOSWAMY ( Alternate)

Lloyd’s Register of Shipping, Bombay

S~IRI V. M. RAO K. C. P. Ltd, Madras SHRI K. SAMBASIVA RAO ( Alternate j

SHRI D. S. SASTRY SHRI D. P. DANI ( Alternate)

DR V. C.-THAKAR

Hindustan Organic Chemicals Ltd, Bombay

Associated Cement Companies Ltd, Bombay SHRI A. K. MISSER ( Alternate )

SIIRI N. THANDAVAN DR Y. VENKATEWAM

A. P. V. Engineering Co Private Ltd, Calcutta National Research Development Corporation of

India, New Delhi DR D. S. VISWANATII

DR P. K. DESHPANDE ( Alternate) Indian Institute of Science, Bangalore

SHRI S. M. RAZVI, Head ( Mech Engg ) ( Secretary )

Director General, IS1 ( Ex-oJicio Member )

Panel for Standardization of Vacuum Equipment, EDC 57 : P2

DwS. K. N. SIIARMA

Members

National Physical Laboratory, New Delhi

I)R S. S. S. ACARWALA Central Electronics -Engineering Research Institute ( CSIR ). Pilani

SIIRI C. AMDASANKARAN Bhabha Atomic Research Centre, Bombay SIIRI P. VIJENDRAN ( Ahmate )

SIIRI J~IAN KUMAR DUTTA Basic & Synthetic Chemicals Pvt Ltd. Calcutta SII;;I BXMALENDRA NATII

CHAKRADORTY ( Alternate )

( Confinucd on page 7 )

2

IS : 6838 - 1973

Indian Standard DIMENSIONS FOR

‘0’ RINGS AND GROOVES FOR VACUUM FLANGES

0. FOREWORD

0.1 This Indian Standard was adopted by the Indian Standards Institution on 13 February 1973, after the draft finalized by the Chemical Engineering Sectional Committee had been approved by the Mechanical Engineering Division Council.

0.2 This standard has been prepared to cover the dimensions for ( 0 ’ rings used in sealing vacuum fianges. The dimensions of suitable grooves for accommodating ( 0 ’ rings are also specified.

0.3 For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, express- ing the result of a test, shall be rounded off in accordance with IS : 2.1960*. The number Df 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 of ‘ 0 ’ rings used for sealing vacuum flanges conforming to IS : 6076-1971t. It also specifies dimensions of grooves to be machined on flanges for accommodating the ‘ 0 ’ rings.

2. ‘O’IUNGS

2.1 Dimensions - The recommended dimensions for ‘ 0 ’ rings shall be as given in Table 1.

2.2 Shore Hardness - The recommended shore hardness of 6 0 ’ :ings shall be 65 & 5.

*Rules for rounding off numerical valks (revised).

tDimensions for vacuum flanges.

3

L

IS : 6838 - 1973

3. GROOVES

3.1 Types - The grooves to be machined on vacuum flanges for receiving ‘ 0 ’ rings shall be of the following types:

a) Rectangular,

b) Trapezium,

c) Dovetail, and

d) Inverted dovetail,

3.2 Dimensions -The dimensions of various types of grooves shall be as given in Tables 2, 3 and 4.

TABLE 1 ‘ 0 ’ RINGS FOR BOLTED VACUUM FLANGES

DESIGNATION

OR10 22.0 ;:;

2.5 2.5 2.5 OR16 265 3.5

;:; 2.5 ::

OR20 31.0 3.5 3.5 2.5 20 OR25 38.0 3.5 3.5 2.5 2.5 25

3.5

;::

5.5

5.5 7.0

;:;

3.5 3.5 3.5 32 3.5 3.5 3.5 40 2:; 3.5 3.5 $5” G3 50

75:; 3.5 3.5 ;:; 100 80

7.0 5.5 5.5 125 7.0 5.5 5.5 160

OR32 OR40 OR50 OR63

OR80 98.0 OR100 116.0 OR125 139.0 OR160 164.5

OR200 225.0 7.0 ;:; 5.5 OR250 275.0 7.0

75:;

,J.,” r. 200 250

OR320 354’0 9.5 9.5 320 OR400 432.0 9.5 9.5 7.0 77:; 400

522.0 9*5 . 9.5 9.5 500 662.0 13.0 193.: 95 9.5 630 832.0 13.0 13.0 9.5 800

I 032.0 13.0 13.0 ;:; 9.5 1000 OR800

OR 1000

( ClUW 2.1 )

All dimensions in millimetres.

INTERNAL CROSS-SECTIONAL DIAMETER *SUITABLE DIAMETER _____--h_-______T FORI:LANGE

Rectangu- ‘kYapezium Dovetail Inverted OP NOMINAL lar Dovetail BORE

44.5 55.5 63.0 82.0

NOTE - The trapezium and inverted dovetail grooves are recommended wherever positive retention of ‘ 0’ rings is needed. The ’ 0 ’ rings for use with boltrd flanges and screwed unions shall have a tolerance of * 0.1 mm on sectional diameter.

*Flanges according to IS : 6076-1971 ‘ Dimensions for vacuum flanges ‘. Preferred sizes are shown in bold.

L

4

IS : 6838 - 1973

TABLE 2 DIMENSIONS OF RECTANGULAR GROOVES ( Chse 3.2 )

All dimensions in millimetres.

+.----_ w-_-4

R = 0.13 to o-5

CROSS-SECTIONAL IV

DIAMETER Max

2.5 2.75 3.5 3.83 5.5 !;.(J5 7.0 7.70 9.5 IO.45

13.0 14.30

TABLE 3 DIMENSIONS OF TRAPEZIUM GROOVES (Clmse 3.2 )

All dimensions in mi!lirnrtrrs.

r..-_--.- J#j -_..&

IS $6838 - 1973

TABLE 4 DIMENSIONS OF DOVETAIL ANb INVERTED DOVETAIL GROOVES

( Clause 3.2 )

All dimenrions in millimctra.

DOVETAIL

CROSS-SECTIONAL DIAMETER

l---W----l R=O’I3to0*5

INVERTED DOVETAIL

H Max L

Z-5 2.0 2.25

3.5 2.8 3.15

5.5 4.4 4.95

7.0 5-6 6.30

9.5 7.6 8.55

13.0 lo.4 1 l-70

IS : 6838 - 1973

( ~onfinued Jrom page 2 )

Members

SWRI P. R. KRISHNAMURTHY

R&vesenling

Indian Institute of Technology, Bombay SHRI Vi P. SUNDERSINCH ( Alternate )

SHRI S. V. NARASAIAH HindIIigh Vacuum Co ( Private) Ltd, Bal;galore SHRI K. R. TAOORE ( Alternate )

SHRl A. RAMABRAHMA Toshniwal Bros Pvt Ltd, Madras SHRI D. J. RAO ( Ahnate)

DR M. RAMAKRISHNA RIO Indian Institute of Science, Bangalore DR D. S. VISWANATH ( Alternate )

SHRI S. C. RANADIV~: J. B. Sawant Engineering PHI Ltd, Bombay