ISO TS 26873-2010 PDF

Full title and description

ISO/TS 26873:2010 — Plastics pipes and fittings — Definition and construction procedures for reference lines. This Technical Specification defines "reference lines" as a generic representation of the creep‑rupture (stress‑rupture) properties of thermoplastic pipes and gives procedures for constructing those lines in a mathematical form to be used in stress‑rupture diagrams and for long‑term strength assessments.

Abstract

ISO/TS 26873:2010 provides methods to derive reference lines that represent expected minimum hoop strength of thermoplastic piping products as a function of time and temperature. It describes the mathematical model used to plot stress‑rupture (creep rupture) reference lines, their intended use for interpolation/extrapolation of test data and for application in cumulative‑damage calculations (for example Miner's rule). The document is concise (five pages) and intended to standardize how reference lines are constructed and reported.

General information

• Status: Published; confirmed as current after systematic review (confirmed 2024).
• Publication date: August 2010 (first edition, 2010-08).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.040.20 (Plastics pipes); 23.040.45 (Plastics fittings).
• Edition / version: Edition 1 (ISO/TS 26873:2010).
• Number of pages: 5 pages.

Key bibliographic and lifecycle details above are taken from the ISO bibliographic record and related standards catalogues.

Scope

This Technical Specification defines reference lines as the generic representation of the creep‑rupture properties of pipes made of thermoplastic materials and gives procedures for drafting reference lines in a mathematical form. It is intended to be used in the preparation of stress‑rupture diagrams that support design stress determinations and long‑term performance predictions of thermoplastic piping. Normative references include ISO 1167‑1, ISO 1167‑2 and ISO 9080.

Key topics and requirements

• Definition of "reference line" as a statistical/mathematical description of expected minimum hoop strength for thermoplastic pipe products when tested per ISO 1167 series.
• Presentation of the mathematical model and fitting form (logarithmic relationships between hoop stress, time to failure and temperature), including parameters used to represent one or two branches (brittle/ductile behavior).
• Procedures for constructing stress‑rupture diagrams and drafting reference lines for interpolation and extrapolation of test data.
• Guidance on intended applications: deriving design stress values, supporting cumulative damage methods (e.g., Miner's rule), and harmonizing reference‑line practice across product standards.
• Normative references and limits of applicability (time and temperature ranges as linked to long‑term hydrostatic strength methods such as ISO 9080).

Typical use and users

Typical users include standards committees, product standards authors, pipe and fittings manufacturers, R&D and materials engineers, test laboratories performing long‑term hydrostatic and stress‑rupture testing, certification bodies, and design engineers in water, wastewater, gas and industrial fluid systems who require standardized reference lines for durability and design calculations.

Related standards

Closely related and referenced documents include ISO 1167‑1 and ISO 1167‑2 (resistance to internal pressure test methods), ISO 9080 (long‑term hydrostatic strength by extrapolation), ISO 13760 (cumulative damage / Miner's rule guidance), and various material/product series standards (for example ISO series for PE, PP, PB and PVC piping). These standards form the testing and application framework that ISO/TS 26873 complements.

Keywords

reference line; stress rupture; creep rupture; thermoplastic pipes; hoop stress; long‑term hydrostatic strength; design stress; Miner's rule; ISO/TS 26873:2010.

FAQ

Q: What is this standard?

A: ISO/TS 26873:2010 is an ISO Technical Specification that defines and prescribes procedures for constructing reference lines representing the creep‑rupture (stress‑rupture) properties of thermoplastic pipes; it standardizes the mathematical form used to express those lines.

Q: What does it cover?

A: It covers the definition of reference lines, the mathematical representation (including the form of the logarithmic relations and parameters), and procedures to draft stress‑rupture diagrams for interpolation and extrapolation of test data used in determining design stress and long‑term performance. Normative test method references are ISO 1167‑1, ISO 1167‑2 and ISO 9080.

Q: Who typically uses it?

A: Standards developers, test laboratories, manufacturers of thermoplastic pipes and fittings, certification bodies, and design and materials engineers working on piping systems where long‑term strength and reliability are critical.

Q: Is it current or superseded?

A: The document was published in August 2010 (first edition) and, according to the ISO bibliographic record, was reviewed and confirmed as current during the periodic review process (confirmed in 2024). Users should check the ISO catalogue for any later revisions or replacements before assuming it is the applicable normative text.

Q: Is it part of a series?

A: It is a stand‑alone Technical Specification that complements a family of ISO standards addressing thermoplastic pipe materials, test methods and product series (for example the ISO 1167 series, ISO 9080 and various material/product series standards). It is commonly used alongside those documents.

Q: What are the key keywords?

A: Reference line, stress rupture, creep rupture, thermoplastics, hoop stress, long‑term hydrostatic strength, design stress, Miner's rule, ISO/TS 26873:2010.