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IS0
I NT ERN AT1 ON AL ORGAN I Z AT I O N FOR STAND AR D I Z AT I O N
IS0 RECOMMENDATION
R 531
CAST IRON SANITARY PIPES AND FITTINGS
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FOR WASTE WATER AND VENTILATION
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1st EDITION
December 1966
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, Cast Iron Sanitary Pipes and Fittings for Waste Water
and Ventilation, was drawn up by Technical Committee ISO/TC 5, Pipes and Fittings, the Secre-
tariat of which is held by the Association Suisse de Normalisation (SNV).
Work on this question by the Technical Committee began in 1955 and led, in 1964, to the
adoption of a Draft IS0 Recommendation.
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In November 1964, this Draft IS0 Recommendation (No. 743) was circulated to all the
IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of an edi-
torial nature, by the following Member Bodies :
Belgium India Sweden
Canada Iran Turkey
Czechoslovakia Israel R.A.U.
Finland Italy United Kingdom
France New Zealand U.S.S.R.
Greece Poland Yugoslavia
Hungary Portugal
Korea, Rep. of Spain
Five Member Bodies opposed the approval of the Draft :
Germany
Netherlands
Norway
Switzerland
U.S.A.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in December 1966, to accept it as an IS0 RECOMMENDATION.
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ISO/R 531 - 1966 (E)
IS0 Recommendation
R 531 Decem ber 1966
CAST IRON SANITARY PIPES AND FITTINGS
FOR WASTE WATER AND VENTILATION
INTRODUCTION
This IS0 Recommendation comprises three parts :
I. Technical specification
II. Spigot and socket dimensions for pipes and fittings
III. Pipes and short connecting pipes.
Comments on Part I - Technical specification
This specification applies to cast iron sanitary pipes and fittings used in the building industry for
pipe-lines for carrying away waste water and for ventilation, excluding rain water and drain pipe-
lines which will, if necessary, be the subject of a separate study.
The distinguishing characteristic of waste water pipe-lines is that they are traversed in a single
direction by products flowing under the influence of gravity. For this reason they are laid with
a certain amount of slope in the direction of flow. They therefore include portions that descend
vertically, obliquely or with a slight slope, excluding any horizontal or ascending portion.
This peculiarity in use and in laying explains why sanitary pipes and fittings always have a
“socket” at their upper end (upstream side) and a “spigot” at their lower end (downstream side).
Such an arrangement makes it easier to seal the joints between successive elements of the line, in
particular when they are placed vertically or with a steep slope.
Among the nominal diameters used in various countries, four have been selected, a given thick-
ness having been allotted to each. The figures and tables in Part III give full information in this
connection.
NOTE. - The nominal diameter is a number used only to classify pipes and fittings rind to enable them to be asso-
ciated. It corresponds approximately to the internal diameter of the pipes.
For each casting, the masses have been determined by calculation, taking the density of cast iron
as 7.15 kg/dm3. This value is intermediate between the values previously specified in various
countries which ranged between 7 and 7.25 kg/dm3. The value of 7.15 gives good practical
agreement between calculated masses and actual masses.
Comments on Part II - Spigot and socket dimensions for pipes and fittings
An annular space has been provided for making the sealed joint between the spigot of one element
and the socket of the adjoining element.
The size of the annular space has been so determined, allowing for the tolerances permitted on
the dimensions of castings, as to make it easy to make a tight, economical and durable joint.
To ensure a regular joint thickness, provision has been made for a centring surface, either on
the outer surface of the spigot or on the inside of the socket, depending on manufacturing processes.
In addition, in accordance with the technique used in some countries, provision has been made
for an optional groove on the inside of the socket.
These latter provisions, like the details of the external contour of the sockets, do not affect the
interchangeability of sanitary pipes and fittings, and it has therefore seemed preferable to leave
them to the discretion of the manufacturers.
Comments on Part III - Pipes and short connecting pipes
For each nominal diameter, various lengths have been selected and the corresponding masses
of the pipes and short connecting pipes have been determined by calculation from these lengths.
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ISO/R 531 - 1966 (E)
PART I
TECHNICAL SPECIFICATION
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ISO/R 531 - 1966 (E)
1. SCOPE
This IS0 Recommendation applies to cast iron sanitary pip
...