ISO 8639-2023 PDF

Full title and description

Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Test methods for leaktightness and proof of structural design of flexible joints. This international standard specifies type test methods for flexible socket-and-spigot joints with elastomeric seals used in buried and aboveground GRP pipeline applications, addressing combinations of axial draw, angular deflection, transverse compression and internal pressure to demonstrate leaktightness and structural performance of the joint design.

Abstract

This document defines destructive test procedures intended for type testing of flexible non‑thrust‑resistant socket‑and‑spigot joints with elastomeric sealing elements. Tests measure joint leaktightness and resistance to damage when subjected to specified combinations of longitudinal extension (draw), angular movement (deflection), compression perpendicular to the pipe axis and internal pressure. The procedures apply to joints for pressure and non‑pressure applications and are intended for joints of all nominal sizes; the tests are damaging and intended for verification of design.

General information

• Status: Published
• Publication date: April 2023 (Edition 3, published 2023-04).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.040.60 (Pipes and fittings; GRP piping systems).
• Edition / version: Edition 3 (2023).
• Number of pages: 9.

Key bibliographic and lifecycle information as published by ISO (replacement of the 2016 edition).

Scope

The standard applies to flexible socket‑and‑spigot joints incorporating elastomeric seals for GRP (glass‑reinforced thermosetting‑plastic) pipes and fittings. It covers test methods for demonstrating leaktightness and the structural proof of joint design under combined mechanical and pressure actions (longitudinal draw, angular deflection, transverse compression and internal pressure). The procedures are intended for type testing across nominal sizes and for applications conveying liquids at temperatures specified in the referring standards.

Key topics and requirements

• Type test methods for flexible, non‑thrust‑resistant socket‑and‑spigot joints with elastomeric sealing elements.
• Assessment of joint leaktightness under combinations of longitudinal extension (draw), angular movement (deflection), transverse compression and internal pressure.
• Procedures intended for both pressure and non‑pressure pipeline applications.
• Tests are intentionally damaging — intended for type testing and design verification, not for reuse of tested specimens.
• Applicability to all nominal pipe sizes; tests reference temperatures and service conditions provided in related product standards.

Typical use and users

Used by GRP pipe and fittings manufacturers, design and pipeline engineers, testing and certification laboratories, procurement/specification writers, and infrastructure owners/operators who need to verify the leaktightness and structural performance of flexible GRP joints for buried or aboveground pipeline systems. It supports type‑testing programs, product qualification and conformance checks for joints and sealing systems.

Related standards

This document replaces ISO 8639:2016 and is related to other GRP piping standards and design/fabrication series (for example the ISO 14692 series on GRP piping for the petroleum and natural gas industries). Users typically consult ISO 14692 parts (system design, qualification and manufacture, fabrication/installation) in conjunction with ISO 8639 when specifying or qualifying GRP piping systems and their joints.

Keywords

GRP; glass‑reinforced thermosetting plastics; pipes; fittings; flexible joints; socket‑and‑spigot; elastomeric seal; leaktightness; type test; structural proof; joint testing.

FAQ

Q: What is this standard?

A: ISO 8639:2023 is an international standard that specifies test methods for leaktightness and structural proof of flexible socket‑and‑spigot joints with elastomeric seals used in GRP pipes and fittings (Edition 3, published April 2023).

Q: What does it cover?

A: It covers destructive type tests to demonstrate joint performance when subjected to combinations of longitudinal draw, angular deflection, transverse compression and internal pressure. The tests assess leaktightness and resistance to damage and are suitable for both pressure and non‑pressure applications.

Q: Who typically uses it?

A: GRP manufacturers, test laboratories, pipeline and design engineers, specifiers and infrastructure owners who require type testing and design verification for flexible GRP joints.

Q: Is it current or superseded?

A: Current — ISO 8639:2023 (Edition 3, published April 2023) is the published replacement for ISO 8639:2016.

Q: Is it part of a series?

A: It is part of the family of standards addressing GRP piping systems and their components and is commonly used alongside the ISO 14692 series (design, qualification/manufacture, fabrication/installation) and other GRP piping standards.

Q: What are the key keywords?

A: GRP, glass‑reinforced thermosetting plastics, pipes, fittings, flexible joints, leaktightness, elastomeric seals, type testing, structural proof.