ISO/R 1128:1969

Ref. No. : ISO/R 1128-1969 (E)
UDC 621.643.4.062
IS0
FOR STAND AR0 IZATIO N
I NT ERN AT I O N A L O RG AN IZ AT I O N
IS0 RECOMMENDATION
R 1128
STEEL TUBES
BUTT WELDING BENDS 5D (90" AND 180")
1st EDITION
October 1969
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore ody
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.

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-2- ISO/R 1128-1%9 (E)
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I IS0 Recommendation R 1128 October 1969
STEEL TUBES
BUTT WELDING BENDS 50 (90" and 180")
1. SCOPE
This IS0 Recommendation specifies the dimensions of steel butt welding bends (90" and 180").
2. DIMENSIONS
d
B=A+-
2
C=2A
The ratio between the radius of the bend and the outside diameter of the tube is approximately 2.5.

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BRIEF HISTORY
The IS0 Recommendation R 11 28, Steel tubes - Butt welding bends 5D (90" and 180'1, was drawn up by
Technical Committee ISO/TC 5, PIpes and fittings, the Secretariat of which is held by the Association Suisse de
Normalisation (SNV).
Work on this question led to the adoption of a Draft IS0 Recommendation.
v
In January 1968, this Draft IS0 Recommendation (No. 1494) was circulated to all the IS0 Member Bodies
for enquiry. It was approved, subject to a few modifications of an editorial nature, by the following Member
Bodies :
Australia India Spain
Belgium Israel Sweden
Brazil Italy Switzerland
Canada Netherlands Thailand
Chile New Zealand Turkey
Colombia Norway U.A.R.
Denmark Poland U.S.S.R.
France Portugal
Germany South Africa, Rep. of
Three Member Bodies opposed the approval of the Draft :
Czechoslovakia
Hungary
United Kingdom
1-
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council, which decided,
in October 1969, to accept it as an IS0 RECOMMENDATION.
Date of the first printing :
Price based on 2 pages
January 1970

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