FprEN ISO 13760

• Status: Not Published
• Publication Date: 03-Mar-2027
• ICS: 23.040.20 - Plastics pipes
• Technical Committee: CEN/TC 155 - Plastics piping systems and ducting systems
• Drafting Committee: CEN/TC 155/WG 16 - Systems for hot and cold water applications
• Current Stage: 4599 - Dispatch of FV draft to CMC - Finalization for Vote
• Start Date: 06-Aug-2026
• Completion Date: 06-Aug-2026
• Ref Project: oSIST prEN ISO 13760:2026 - Plastics pipes for the conveyance of fluids under pressure - Miner's rule - Calculation method for cumulative damage (ISO/DIS 13760:2026)

• Consolidated By: ISO/FDIS 13760 - Plastics pipes for the conveyance of fluids under pressure — Miner’s rule — Calculation method for cumulative damage
• Effective Date: 12-Feb-2026
• Revises: EN ISO 13760:1998 - Plastics pipes for the conveyance of fluids under pressure - Miner's rule - Calculation method for cumulative damage (ISO 13760:1998)
• Effective Date: 30-Oct-2024

FprEN ISO 13760 is a draft standard for plastics pipes for the conveyance of fluids under pressure. It specifies how to apply Miner’s rule to calculate cumulative damage and design time under known varying loads, including changing temperature, pressure, or stress. The document is aimed at designers and users of plastics piping systems who need a calculation method for service-life assessment.

What does FprEN ISO 13760 specify?

FprEN ISO 13760 specifies the use of Miner’s rule for plastics pipes and piping systems made of plastics materials under varying but known load conditions. It is written for calculating design time until failure, and it can also be used in reverse to find tolerable load levels for a target design time.

The document is organized into six clauses and two informative annexes:

Annex	What it covers
Annex A	Examples of using Miner’s rule for design stress and design pressure, including application classes according to ISO 10508
Annex B	Miner’s rule and oxidative stability, including an Arrhenius-based cumulative life example

The scope also states that Miner’s rule must be applied separately to each failure mechanism. In practice, that means mechanical failure, oxidative attack, and dehydrochlorinative degradation are treated as separate checks, and a material is only suitable when it meets all relevant criteria.

What are the key requirements of FprEN ISO 13760?

The calculation method is based on cumulative yearly damage

FprEN ISO 13760 uses Miner’s rule to turn a service history with changing conditions into a single damage value. Clause 5 sets out the assumptions: damage capacity is taken as 100%, damage under constant conditions is proportional to time, and damage from different conditions is additive.

Clause 6 gives the core procedure: calculate the total yearly damage from the individual fractions of time and the time-to-failure under each condition, then calculate the accumulated design time from that yearly damage. In practice, this is the document’s main calculation path for design assessment.

The method can be used forward or backward

FprEN ISO 13760 is not only for finding design life. The scope says it can also be applied reciprocally to determine stress or pressure regimes that are tolerable during a target design time.

That matters for design work because it lets an engineer start from the required service life and solve for acceptable stress or pressure, rather than only checking whether a chosen design survives long enough.

Different load histories are treated as separate conditions

FprEN ISO 13760 uses fractions of a year for each set of conditions, such as different temperatures, pressures, or stresses. The document’s symbol list defines these fractions and the corresponding time under each condition.

In practice, this means a service profile must be broken into segments before the calculation is done. For hot and cold-water applications, the temperature-time profiles from ISO 10508 are the model used in the examples.

Separate failure mechanisms must be checked separately

FprEN ISO 13760 states that Miner’s rule must be applied separately to each failure mechanism. Mechanical failure due to internal pressure is not combined with oxidative or dehydrochlorinative degradation in the same calculation, assuming no interaction.

For a reader, this means the same pipe may need multiple life checks, one for each relevant mechanism, rather than one combined result.

The annexes show how to apply the method in real design cases

Annex A gives step-by-step procedures for determining design stress and design pressure for application classes according to ISO 10508. It shows how to use design coefficients from the applicable material standard and, for multilayer M-pipes, how to use long-term pressure strength data.

Annex B shows how the same logic is applied to oxidative stability of polyolefins under varying temperatures and times. That is useful when the design life is influenced by thermal oxidation rather than only pressure loading.

What terms does FprEN ISO 13760 define?

• Miner’s rule - An empirically based method that combines damage from varying load conditions by adding the damage contributions.
• a - The fraction of a year spent under one set of conditions, expressed as a percentage.
• t - The defined time under one specified set of conditions, expressed in years.
• t - The accumulated design time of use under varying conditions, expressed in years.
• TYD - Total yearly damage, expressed as a percentage.
• Design stress - The stress value selected for an application class and material in Annex A.
• Design pressure - The pressure value selected for a multilayer M-pipe construction and application class in Annex A.

Who uses FprEN ISO 13760?

FprEN ISO 13760 is used by designers of plastics piping systems, especially where temperature and pressure vary over the service life. It is also relevant to material specialists, test laboratories, and certification or quality teams that need to document a calculation basis for design life.

The document is especially relevant for hot and cold-water applications, polyolefin pipes, and multilayer M-pipe constructions. Buyers and specifiers may also use it to check whether a supplier’s design-life calculations follow the same method.

What changed in FprEN ISO 13760 from the previous edition?

FprEN ISO 13760 is the second edition and replaces ISO 13760:1998. The foreword states that the scope has been re-phrased to give a more detailed description of Miner’s rule for designing plastics piping systems.

The foreword also states that the application examples in Annexes A and B have been reformulated into exact procedures and extended.

Which standards are used with FprEN ISO 13760?

• ISO 10508:2006 - Supplies the hot and cold water application classes and their temperature-time profiles used in the calculations.
• ISO 10508:2006/Amd 1:2018 - Updates the same classification and design guidance used by the document.
• ISO 15876-2:2017 - Provides design coefficients used in the Annex A example for Polybutylene PB-H.
• ISO 12230:2012 - Gives the PB-H reference lines used in the Annex A worked example.
• ISO 21003-series - Provides the multilayer M-pipe context and long-term pressure strength diagram referenced in Annex A.
• ISO 9080 - Supplies the activation energy referenced in the Annex B oxidative-life example.

What does the FprEN ISO 13760 document contain?

FprEN ISO 13760 contains the principle behind Miner’s rule, the general calculation procedure, and two informative annexes with worked application paths. Clause 6 gives the core calculation for total yearly damage and accumulated design time.

Annex A provides procedures for calculating design stress and design pressure from ISO 10508 application classes, including an example table for a specific material. Annex B sets out an Arrhenius-based oxidative stability calculation and includes a table of cumulative design times for application classes.

SLOVENSKI STANDARD
01-marec-2026
Polimerne cevi za transport tekočin pod tlakom - Minerjevo pravilo (M. A. Miner) -
Računska metoda za kumulativen učinek poškodb (ISO/DIS 13760:2026)
Plastics pipes for the conveyance of fluids under pressure - Miner's rule - Calculation
method for cumulative damage (ISO/DIS 13760:2026)
Kunststoffrohre für den Transport von Fluiden unter Druck - Minersche Regel -
Berechnungsverfahren für kumulative Schädigungen (ISO/DIS 13760:2026)
Tubes en matières plastiques pour le transport des fluides sous pression - Règle de
Miner - Méthode de calcul du cumul des dommages (ISO/DIS 13760:2026)
Ta slovenski standard je istoveten z: prEN ISO 13760
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 13760
ISO/TC 138/SC 5
Plastics pipes for the conveyance
Secretariat: NEN
of fluids under pressure — Miner's
Voting begins on:
rule — Calculation method for
2026-01-13
cumulative damage
Voting terminates on:
2026-04-07
Tubes en matières plastiques pour le transport des fluides sous
pression — Règle de Miner — Méthode de calcul du cumul des
dommages
ICS: 23.040.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 13760:2026(en)
DRAFT
ISO/DIS 13760:2026(en)
International
Standard
ISO/DIS 13760
ISO/TC 138/SC 5
Plastics pipes for the conveyance
Secretariat: NEN
of fluids under pressure — Miner's
Voting begins on:
rule — Calculation method for
cumulative damage
Voting terminates on:
Tubes en matières plastiques pour le transport des fluides sous
pression — Règle de Miner — Méthode de calcul du cumul des
dommages
ICS: 23.040.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
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or ISO’s member body in the country of the requester.
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RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
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Email: [e-mail]
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 13760:2026(en)
ii
ISO/DIS 13760:2026(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms. 1
5 Principle . 2
6 General procedure . 2
Annex A (informative) Examples of the use of Miner´s rule. 3
Annex B (informative) Miner's rule and oxidative stability . 7
Bibliography . 9

iii
ISO/DIS 13760:2026(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
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patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
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Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 138, (Plastics pipes, fittings and valves for the
transport of fluids), Subcommittee SC 5, (General properties of pipes, fittings and valves of plastic materials and
their accessories — Test methods and basic specifications).
This second edition cancels and replaces the first edition (ISO 13760: 1998), which has been technical
revised. The main changes compared tom the previous edition are as follows:
— The scope of the document has been re-phrased for as more detailed description of Miner´s rule with
respect to designing plastics piping systems.
— The application examples given in Annexes A and B have been reformulated to exact procedures and
extended.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
ISO/DIS 13760:2026(en)
Introduction
In plastics piping systems, operating conditions like temperature and pressure can vary over the whole
service time.
One example is in hot & cold-water application, in particular, this variation is mainly in temperature. (E.g.
a hot water pipe is not necessary all the service time at constant high temperature but usually at the same
pressure). Typical time temperature profiles are defined in ISO 10508 as application classes and these
profiles are used for designing the dimensions of the piping components.
Miner´s rule, which allows the assessment of a load collective on the cumulative damage, was found to be
suitable also for dimensioning plastics piping components under varying conditions to achieve a targeted
design time. Additionally, the effect of cumulative damage caused by oxidative attack e.g. for polyolefins, at
varying operating conditions on the design life can be evaluated with Miner´s rule.

v
DRAFT International Standard ISO/DIS 13760:2026(en)
Plastics pipes for the conveyance of fluids under pressure —
Miner's rule — Calculation method for cumulative damage
1 Scope
In general terms, Miner’s rule is a common approach to calculate how the accumulation of a specific load
that varies over time effects the time until failure.
This international standard specifies the application of Miner’s rule for calculating the design time until
failure of plastics pipes and piping systems of plastics materials under varying, but known, load conditions.
Miner’s rule can also be applied reciprocally to calculate the tolerable load levels along a desired design time.
This international standard specifies particularly the application of Miner’s rule to calculate stress or pressure
regimes, respectively, that are tolerable during a targeted design time for plastics or composite pipes.
Further, the application of Miner’s rule on the effect of accumulated damage on polyolefins caused by
oxidative attack under varying temperatures and times on the design life is specified.
It is necessary to apply Miner's rule to each failure mechanism separately. Thus, for mechanical failure due
to internal pressure, other failure mechanisms, such as oxidative or dehydrochlorinative degradative failure
mechanisms, are to be neglected (assuming, of course, no interaction). A material may be used only when it
is proven to conform to all failure mechanism criteria.
NOTE Miner's rule is an empirically based procedure and is only a first approximation to real
...