ISO 24033:2025 PDF

Name: ISO 24033:2025 — Polyethylene of raised temperature resistance (PE-RT) pipes — Effect of time and temperature on the expected strength
SKU: ISO 24033:2025
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Polyethylene of raised temperature resistance (PE-RT) pipes — Effect of time and temperature on the expected strength

Название (английский):

ISO 24033:2025

Polyethylene of raised temperature resistance (PE-RT) pipes — Effect of time and temperature on the expected strength

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 14
Дата публикации:: 11 июня 2025 г.
Издание:: ISO IS 24033 edition 3 version 1
ICS:: 23.040.20

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Описание (английский):

This document specifies the minimum values for expected strength as a function of time and temperature in the form of reference lines, for use in calculations on pipes made of a) polyethylene of raised temperature resistance (PE-RT) type I, and b) polyethylene of raised temperature resistance (PE-RT) type II.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 24033:2025 - Polyethylene of raised temperature resistance (PE‑RT) pipes defines how the expected long‑term strength of PE‑RT pipe materials varies with time and temperature. The standard provides mathematically defined reference lines (and tabulated/graphical values) for PE‑RT Type I and Type II over the typical service range (20 °C to 110 °C). These reference lines are intended for use in strength calculations, material qualification and design of piping systems exposed to elevated temperatures.

Key topics and requirements

Reference lines and formulae: Expected strength is given by log‑time equations of the form log t = A + B/T + C log σ + (D/T) log σ. PE‑RT Type I uses two branches (20–95 °C) plus a separately determined 110 °C formula; Type II uses a single formula up to 110 °C.

Temperature range: Reference lines generally apply between 20 °C and 110 °C; 110 °C data are determined from tests with water inside and air outside.

Tabulated and graphical data: Tabled hoop stresses for various temperatures and service times (no safety factors included) and graphical plots are provided for easy lookup.

Extrapolation limits: Minimum extrapolation time limits are specified (based on 1 year testing at 110 °C and Arrhenius extrapolation with Ea = 110 kJ/mol). Example: ≤60 °C corresponds to 100 years, while 110 °C has shorter extrapolation limits.

Conformance testing: Annex A requires evaluation per ISO 9080 or equivalent, using internal pressure tests in accordance with ISO 1167‑1/2. At least 97.5% of test points must lie on or above the reference lines; additional checks prevent brittle “knee” failures.

Design guidance: Annex B explains deriving maximum calculated S values and minimum wall thicknesses relative to application classes (e.g., hot water, underfloor heating), using Miner’s rule and references such as ISO 10508 and ISO 13760.

Applications and users

ISO 24033:2025 is essential for:

Pipe and compound manufacturers qualifying PE‑RT grades for hot‑water and heating systems.

System designers and plumbing/HVAC engineers calculating required hoop stress and wall thickness for long‑term performance.

Test laboratories performing long‑term hydrostatic strength tests and extrapolations.

Standards bodies and specifiers writing system standards for potable hot water, underfloor heating and high‑temperature radiator systems.

Keywords: ISO 24033:2025, PE‑RT, expected strength, reference lines, hydrostatic strength, hoop stress, extrapolation limits, ISO 9080, ISO 1167.

ISO 24033:2025 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

SIST EN ISO 9080:2012

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

SIST EN ISO 1167-1:2006

Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance…

ISO 10508:2006/Amd 1:2018

Plastics piping systems for hot and cold water installations — Guidance for classification and design — Amend…

SIST EN ISO 13760:1999

Plastics pipes for the conveyance of fluids under pressure - Miner's rule - Calculation method for cumulative…

SIST EN ISO 1167-4:2008

Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance…

SIST EN ISO 1167-2:2006

Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance…

ISO 1043-1:2011/Amd 1:2016

Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special characteristics — Amendme…