Plaströr

Ämnesområden: Plaströr
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: ISO
Svarsdatum: den 9 jan 2023
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ISO 161-1:2018 specifies the nominal outside diameters for metric thermoplastics pipes for the conveyance of fluids in pressure and non-pressure applications. It also specifies nominal pressure ratings and minimum required strengths for pressure applications.
ISO 161-1:2018 is applicable to smooth thermoplastics pipes of constant circular cross-section along the whole length of the pipe, whatever their method of manufacture or material of construction.
ISO 161-1:2018 is not applicable to pipes designated according to the nominal inside diameter DN/ID.
ISO 161-1:2018 is a basis for standards writers for the selection of nominal diameters and nominal pressures in the drafting of product standards.

Ämnesområden: Plaströr
Kommittébeteckning: SIS/TK 156 (Plast)
Källa: ISO
Svarsdatum: den 16 jan 2023
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This document specifies two test methods for determining the longitudinal tensile properties of glassreinforced thermosetting plastics (GRP) pipes. The properties which can be determined are
— the longitudinal tensile strength, and
— the percentage ultimate elongation.
Method A uses, for the test piece(s), a longitudinal strip cut from a pipe.
Method B uses a specified length of the full cross-section of the pipe.
Method A is applicable to pipes with a nominal size of DN 50 or greater with circumferentially wound filaments, with or without chopped glass and/or woven rovings and/or fillers, and to centrifugally cast pipes. It is applicable to pipes with helically wound filaments with a nominal size of DN 200 or greater.
Method B is applicable to all types of GRP pipe. It is usually used for pipes with a nominal size up to and including DN 150.
Results from one method are not necessarily equal to the results derived from any of the alternative methods. However, all methods have equal validity.
Annex A describes additional considerations for method B that have been found useful for the testing of thin-walled helically wound pipes and can be used to supplement the basic text.
NOTE This document does not address the determination of longitudinal tensile modulus. Due to the multilayer construction of many GRP pipes, the accurate measurement of strain, necessary for modulus determination,
can be very difficult. If it is desired to determine longitudinal modulus, see ISO 527-4 and/or ISO 527-5.