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IS0
I NT ERN AT1 ON AL ORGAN IZATl ON FOR STA N DARD IZATl O N
IS0 RECOMMENDATION
O
R 161
PIPES OF PLASTICS MATERIALS FOR THE TRANSPORT OF FLUIDS
(OUTSIDE DIAMETERS AND NOMINAL PRESSURES)
PART I: METRIC SERIES
1st EDITION
June 1960
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
Copies to be obtained through the national standards organizations.
Also issued in French and Russian.
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BRIEF HISTORY
The IS0 Recommendation R 161, Pipes of Plastics Materials for the Transport of Fluids
(Outside Diameters and Nominal Pressures). Part I: Metric Series, was drawn up by Technical
Committee ISO/TC 5, Pipes andfittings, the Secretariat of which is held by the Association Suisse
de Normalisation (SNV).
During 1954, the Technical Committee decided, by correspondence, to set up a Sub-Com-
mittee ISO/TC 5/SC 6 to study pipes and fittings of plastics materials for the transport of fluids.
The Netherlands Member Body was entrusted with the Secretariat of this Sub-Committee.
At the unofficial meeting of the Sub-Committee, held in The Hague, in April 1955, the proposal
was made to standardize the outside diameters and nominal pressures of the pipes, so as to
simplify the tooling for the manufacture of the pipes, to make the fitting easier, and to settle upon
a limited selection of pipes. As a result of this decision, a draft proposal was drawn up for a
metric series, based on preferred numbers and taking the various existing standards into account.
This draft proposal was adopted by the Sub-Committee at its first meeting, held in Zurich, in
March 1956.
This draft proposal was then submitted by correspondence, in June 1958, to the members
of the Technical Committee and was adopted by a majority of them as a Draft IS0 Recommen-
mendation.
On 25 March 1959, this Draft IS0 Recommendation (No. 282) was distributed to all the
IS0 Member Bodies and was approved, subject to a few modifications, by the following Member
Bodies :
Austria France Poland
Belgium Germany Romania
Spain
Brazil
Hlwi%ry
Burma India Sweden
Canada Israel Switzerland
Czechoslovakia Italy U.S.S.R.
Denmark Japan
Finland Netherlands
Five Member Bodies opposed the approval of the Draft, in particular because this Draft
dealt only with a metric series and did not provide for a corresponding inch series:
Ireland, New Zealand, Norway, United Kingdom, U.S.A.
This Draft IS0 Recommendation was then submitted to the IS0 Council, which decided,
during its meeting, in June 1960, to accept it as a
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