INTERNATIONAL STANDARD
reinforcedthermosettingplastics Plasticspipingsystems-Glass- tofailureundersustainedinternal (GRP)pipes-Determinationoftime pressure
Systemes de canalisations en plastiques - Tubes en plastiques thermodurcissables renforces de verre (PRV) - Determination dutemps mis jusqu’α la defaillance sous une pression interne constante
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Contents
Page
Foreword. ivIntroduction. V1 Scope. 12 Normative references. 13 Terms and definitions. 14 Principle.5 Test pieces. Apparatus. 26 6.1 Number. 4 46.2 6.3 Free length. Cutting-7 Conditioning. 48 Procedure. 49 Detection of failure 59.1 9.2 Detection methods. General. 5 59.2.1 9.2.2 Drop in electrical resistance. Loss of test liquid. 510 Test report. 6 6Annex A (informative) Electronic leak/weep detection 7
Foreword
bodies (ISO member bodies). The work of preparing International Standards is normally carried outthrough ISO technical mittees. Each member body interested in a subject for which a technical mittee has been established has the right to be represented on that mittee. InternationalISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of organizations governmental and non-governmental in liaison with ISo also take part in the work.electrotechnical standardization.
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transport of fluids Submittee SC 06 Reinforced plastics pipes and fittings for all applications.
This second edition cancels and replaces the first edition (ISO 7509:2000) which has been technicallyrevised.
Introduction
This International Standard describes a method for determining the long-term resistance to internalpressure of glass-reinforced thermosetting plastics (GRP) pipes.
It is a method which uses the following conditions:
-- water as the reference liquid inside the test piece;
- water or air as the environment outside the test piece.
The method can be used for tests at different temperatures. It should be noted that for a giventemperature the results obtained can differ depending on the end loading conditions and whether the external environment is water or air.
The method described in this International Standard differs from those in some other similar standardsin the following details:
- the failure criteria and the detection of failure;- the strain in the longitudinal and circumferential directions can be measured during the test;
the test pressure is maintained constant.
This method can be used to obtain data to establish internal pressure versustime-to-failure relationshipsat different temperatures. The procedures for establishing the relationships are not within the scope ofthis International Standard. For such purposes attention is drawn to ISO 10928.
