ISO 17456:2006

Name: ISO 17456:2006 — Plastics piping systems — Multilayer pipes — Determination of long-term strength
SKU: ISO 17456:2006
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Plastics piping systems — Multilayer pipes — Determination of long-term strength

Название (английский):

ISO 17456:2006

Plastics piping systems — Multilayer pipes — Determination of long-term strength

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 9
Дата публикации:: 3 октября 2006 г.
Издание:: ISO IS 17456 edition 1 version 1
ICS:: 23.040.20

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Описание (английский):

ISO 17456:2006 specifies two alternative methods for determining the long-term hydrostatic strength of multilayer pipes: a calculation method applicable to multilayer P pipes (all polymer layers) and a test method applicable to both multilayer P and multilayer M pipes (polymer and metal layers). It is not applicable to pipes consisting of one polymeric stress-designed layer or having an outside polymeric layer that is not stress-designed.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 17456:2006 - Plastics piping systems - Multilayer pipes - Determination of long-term strength specifies two alternative methods to determine the long-term hydrostatic strength of multilayer pipes. It covers:

Procedure I (calculation) - a method for multilayer P pipes (all polymer layers) using layer material long‑term strength and the Annex A equation, with mandatory validation tests.

Procedure II (pressure test) - a test method applicable to both multilayer P and multilayer M pipes (polymer + metal layers), using pressure-to-failure data and statistical analysis (ISO 9080).

ISO 17456 is intended for multilayer constructions only and excludes pipes consisting of a single stress‑designed polymeric layer or pipes with a non‑stress-designed external polymer layer.

Key topics and requirements

Two alternative methods: calculation for P‑type multilayer pipes; experimental pressure testing for both P and M types.

Reference test standards: test pieces and pressure tests are prepared and performed in accordance with ISO 1167‑1 and ISO 1167‑2; long‑term strength analysis follows ISO 9080.

Validation: Procedure I requires confirmation testing of each pipe design. Typical validation conditions include T = 80 °C for t = 3 000 h or T = 95 °C for t = 1 000 h (lower temperatures may be used to avoid degradation).

Test planning and groups: For Procedure II, test at least one diameter per dimension group (≤26 mm, >26–≤63 mm, >63 mm). For multilayer M pipes use the diameter with the highest metal‑layer SDR.

Statistical and reporting requirements: Pressure‑to‑failure datasets must conform to ISO 9080 spread and reporting rules. Confirmation testing requires a minimum number of failures (e.g., at least 18 failures spread from 10 h to 10 000 h, with other distribution constraints).

Control points and confidence limits: Procedures define calculation of long‑term hydrostatic strength (LTHS) and lower confidence limits (LPL) for required times (e.g., 22 h, 165 h, 1 000 h) and extrapolated 5‑year p values.

Applications and who uses it

Pipe manufacturers developing multilayer polymer and polymer/metal composite pipes to demonstrate long‑term hydrostatic performance.

Test laboratories performing pressure‑to‑failure and long‑term strength testing following ISO 1167 and ISO 9080 methodologies.

Design and specification engineers, product certifiers and regulators who need validated long‑term pressure ratings for multilayer piping systems used for the conveyance of fluids.

Quality and R&D teams assessing new multilayer constructions or validating calculation models against experimental results.

Practical benefits include consistent determination of long‑term hydrostatic strength, validated calculation workflows for polymer-only multilayer pipes, and clear test/validation criteria for product certification.

ISO 17456:2006

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and who uses it

Related standards

Технические детали

ISO 9080:2012

Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of thermoplastics m…

BS EN ISO 1167-1:2006

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BS EN ISO 1167-2:2006

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BS EN ISO 11670:2003

Lasers and laser-related equipment. Test methods for laser beam parameters. Beam positional stability.

ISO 17454:2006

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BS ISO 17455:2005

Plastics piping systems. Multilayer pipes. Determination of the oxygen permeability of the barrier pipe.