Overview
EN ISO 13844:2022 (ISO 13844:2022) specifies a laboratory test method for leaktightness of elastomeric‑sealing‑ring‑type socket joints used with plastic pressure pipes. The standard defines how to expose an assembled socket/pipeline joint to negative internal pressure (partial vacuum) while subjecting the joint to angular deflection and deformation, and how to monitor and report any leakage. EN ISO 13844:2022 supersedes the 2015 edition and has been adopted by CEN as EN ISO 13844:2022.
Key topics and technical requirements
- Scope: Test assembled joints between elastomeric‑sealing‑ring sockets (plastic or metal) and plastic pressure pipes for leaktightness under negative pressure, angular deflection and deformation.
- Test principle: Apply specified negative pressures to the test piece while imposing angular deflection and, where required, diametric/beam deformation; inspect and record leakage over a specified duration.
- Test parameters (to be provided by the referring standard or, if absent, in Annex A): test medium, test pressure, test duration, test temperature, deformation (%), angle of deflection (°), and free length (mm).
- Apparatus: Framework with at least two fixing devices (one movable), vacuum pump and gauge (±1 %), isolation valve, mechanical/hydraulic device for diametric deformation, and beams for vertical‑plane deformation (beam width depends on pipe diameter).
- Test pieces and preparation: Use pipe of same nominal pressure (PN) or series (S) as socket; assemble per manufacturer’s instructions; fittings and pipes should not be tested until 24 h after production (unless otherwise agreed).
- Procedure highlights: align pipe and socket, apply deformation at 0.5·d from socket mouth, determine and set required free angle of deflection, apply and isolate negative pressure, monitor for pressure change/leakage while maintaining specified temperature tolerance (±2 °C).
Applications and users
EN ISO 13844:2022 is used for:
- Type testing and quality control of socket fittings and plastic pressure pipes.
- Product development and validation for manufacturers of pipes, fittings and elastomeric seals.
- Independent test laboratories and certification bodies conducting conformity assessment.
- Specifiers, engineers and regulators who require documented resistance to vacuum conditions combined with mechanical loading.
Practical use cases include ensuring leaktight performance where systems may experience partial vacuum or bending loads during installation, operation or transient events.
Related standards
- ISO 13844:2022 (international text)
- EN ISO 13844:2022 (CEN adoption)
- ISO 13259 (beam shape alignment referenced in the 2022 revision)
- ISO/TC 138 / CEN/TC 155 publications for plastics piping systems
Keywords: EN ISO 13844:2022, ISO 13844:2022, plastics piping systems, elastomeric‑sealing‑ring socket joints, leaktightness test, negative pressure, angular deflection, deformation, socket joints test method.
