Overview
EN ISO 1167-1:2006 - Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance to internal pressure - Part 1: General method - is a CEN-endorsed international standard that defines a general hydrostatic test method for assessing the resistance to internal pressure of thermoplastic piping systems. The method applies to pipes, fittings and assemblies used for the transport of fluids and supports water-in-water, water-in-air and water-in-liquid test environments at a specified temperature.
Key Topics and Technical Requirements
- Scope and principle: Specifies constant internal hydrostatic pressure at a defined temperature until a specified time or failure, with test pieces conditioned beforehand.
- Apparatus: Detailed requirements for pressurizing equipment and end caps:
- Type A end caps transmit hydrostatic end thrust to the test piece (used for long-term hydrostatic strength tests).
- Type B sockets do not transmit end thrust and allow longitudinal movement.
- Temperature control: Test media in a tank must be kept to ±1 °C; ovens to +2 / −1 °C (as specified) with forced circulation recommended to minimise temperature variation.
- Test piece preparation: Reference to preparation procedures for pipes, components and assemblies (see related parts).
- Pressure calculation methods: Calculation of test pressure can be based on measured dimensions, nominal dimensions or SDR (Standard Dimension Ratio); circumferential (hoop) stress and test pressure are key parameters.
- Calibration and accuracy: Equipment calibration and measurement accuracy requirements are addressed.
- Conditioning, test procedure and reporting: Specifies conditioning, duration, failure criteria, and the required content of the test report.
Applications and Who Uses It
- Manufacturers of thermoplastic pipes, fittings and assemblies use EN ISO 1167-1:2006 for product development, batch verification and quality control.
- Independent testing laboratories and certification bodies apply the method for compliance testing and performance validation.
- Design engineers and specifiers reference the standard when assessing long-term hydrostatic performance for systems conveying potable water and other fluids.
- R&D teams use the method to compare materials, joint types and end-cap effects on time-to-failure and durability.
Keywords: EN ISO 1167-1:2006, thermoplastics pipes, hydrostatic testing, internal pressure resistance, SDR, hoop stress, end caps, pipe testing, long-term hydrostatic strength.
Related Standards
- ISO 1167-2:2006 - Preparation of pipe test pieces
- ISO 1167-3 - Preparation of components
- ISO 1167-4 - Preparation of assemblies
- ISO 3126 - Determination of dimensions for plastics components
- ISO 9080 - Long-term hydrostatic strength determination (extrapolation)
This part (1) provides the general test framework; consult Parts 2–4 and the referenced ISO documents for detailed specimen preparation, specific procedures and long-term strength evaluation.