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UDC 621.643.06 : 696.14 : 669.13
IS0
INTERN AT1 ON AL ORGAN IZATl ON FOR STAND A RD I ZATl ON
ADDENDUM 1
TO
IS0
R E CO M M E N D AT I O N
R 531-1966
CAST IRON SANITARY PIPE FITTINGS
FOR WASTE WATER AND VENTILATION
PART IV
FI TT I NGS
1st EDITION
June 1970
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 only
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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BRIEF HISTORY
The IS0 Recommendation R 531 -1966, Cast iron sanitary pipes and fittings for waste water and ventilation, was drawn up
by Technical Committee ISO/TC 5, Pipes andfittings, the Secretariat of which is held by the Association Suisse de Normalisation
(SNV).
Work on this question led to the adoption of Draft IS0 Recommendation No. 743, which was circulated to all the
IS0 Member Bodies for enquiry in November 1964. It was approved by 22 Member Bodies; five Member Bodies opposed the
approval of the Draft (Germany, Netherlands, Norway, Switzerland and the U.S.A.).
This Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council, which decided, in December 1966,
to accept it as an IS0 RECOMMENDATION.
BRIEF HISTORY RELATING TO ADDENDUM 1
The work which led to the publication of IS0 Recommendation R 53 1-1966 was continued and an addendum
to that IS0 Recommendation was drawn up in the form of a Draft IS0 Recommendation. This Draft (No. 1670),
after having been adopted by the Technical Committee, was circulated to all the IS0 Member Bodies for enquiry in
September 1968. It was approved, subject to a few modifications of an editorial nature, by the following Member
Bodies :
Australia Greece Poland
Austria Hungary Spain
Belgium India Thailand
Canada
Israel Turkey
Denmark Italy
U.A.R.
France Korea, Rep. of
The following Member Bodies opposed the approval of the Draft
Czechoslovakia Sweden
Netherlands Switzerland
Norway United Kingdom
This Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council, which decided
to accept it as Addendum 1 to IS0 Recommendation R 531 -1966.
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FOREWORD
IS0 Recommendation R 53 1, Cast iron sanitary pipes and fittings for waste water and ventilation, consists of three
parts as follows :
I Technical specification
II Spigot and socket dimensions for pipes and fittings
III Pipes and short connecting pipes
This Addendum forms Part IV of IS0 Recommendation R 53 1-1966, namely :
IV Fittings.
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CONTENTS
Page
1.Scope . 7
2 . General characteristics of fittings . 7
2.1 Bends and single branches . 7
2.2 Double branches . 7
2.3 Sfitting . 7
2.4 Thickness of fittings . 7
2.5 Change of diameters . 7
L
3 . Dimensions. masses and symbols . . 8
3.1 45" bends . . 8
3.2 67" 30' bends . . 9
3.3 87" 30' bends . . 10
3.4 Single branches with equal 45" branch pipes (breeches pipes) . . . 11
3.5 Single branches with unequal 45" branch pipes (branches) . . 12
3.6 Single branches with equal 67" 30' branch pipes (breeches pipes) . . 13
3.7 Single branches with unequal 67" 30' branch pipes (branches) . . . 14
3.8 Double branches with equal 67" 30' branch pipes (breeches pipes) . 15
3.9 Double branches with unequal 67" 30' branch pipes (branches) . . 16
3.10 Single branches with equal 87" 30' branch pipes (breeches pipes) . . . 17
L
3.1 1 Single branches with unequal 87" 30' branch pipes (branches) . . . 18
3.1 2 S fitting with a 75 spacing . . 19
3.13 S fitting with a 150 spacing . . 20
3.14 Tapers . . 21
3.1 5 Collars (double socket) . . 22
4 . Tolerances . 23
4.1 Tolerances on lengths . 23
4.2 Tolerances on masses . 23
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ISO/R 531-1966/Add. 1-1970 (E)
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Addendum 1 to IS0 Recommendation R 531-1966 June 1970
CAST IRON SANITARY PIPE FITTINGS
FOR WASTE WATER AND VENTILATION
PART IV
F I TT 1 N GS
1. SCOPE
This addendum to IS0 Recommendation R 53 1 -1966, Cast iron sanitary pipes and fittings for waste water and
ventilation, applies to cast iron fittings used in the building industry for the laying of waste water and ventilation
pipes, and has the object of
- reducing the dimensions of the castings (lengths b and L) and thus facilitating casting;
- limiting the number of types in order to simplify the manufacture, supply and storage in factories, stores,
and on site.
2. GENERAL CHARACTERISTICS OF FITTINGS
The considerations explained in section 1, together with the study of the provisions adopted by the various
countries, have led to the adoption of the following rules which rationally connect the various fitting types.
2.1 Bends and single branches
The slope of oblique pipeline portions has been fixed at 45", 67" 30' and 87" 30'. The same values have
been ascribed to the angle of the bends and to the inclination of the branch pipes.
2.2 Double branches
Double branches, which are used far less than single branches, are provided for exclusively with the most
common branch inclination : 67" 30'.
S fitting
2.3
The spacing between the S branches has been fmed at 75 or 150 mm, the larger spacing being obtained
through the combination of two bend pipes connected, if necessary, by a short pipe.
2.4 Thickness of fittings
The wail thicknesses provided for fittings are equal to those provided for pipes of the same nominal diameters.
As an exception to the above, fittings with orifices of different diameters have a uniform thickness, equal to
the thickness corresponding to the nominal diameter of the largest orifice.
2.5 Change of diameters
A series of branch pipe fittings has been provided for in order to ensure the junction of the main and branch
pipes.
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