Overview
EN ISO 1167-3:2007 - Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance to internal pressure - Part 3: Preparation of components (ISO 1167-3:2007) is a CEN-endorsed ISO standard that specifies how to prepare fittings and valve bodies for hydrostatic internal pressure testing according to ISO 1167-1. The document defines mounting, sealing and closure arrangements so components can be safely conditioned and tested for resistance to internal hydrostatic pressure.
Key topics and requirements
- Scope: Preparation procedures for individual components (fittings and valve bodies) to be tested for internal pressure resistance. (Note: many polyolefin fittings joined by fusion are covered in ISO 1167-4 as assemblies.)
- Test-piece assembly: Components are converted into pressure-tight test pieces using end caps, pipes, plugs or alternative closing devices; air must be purged prior to pressurization.
- Pressure-tight devices: Detailed acceptable methods for sealing and retaining connectors, including:
- Joints using pipes and/or end caps
- Mechanical joints with external threads or machined grooves
- Mechanical compression joints using ribbed half-segments
- Internally pinned joints with ring seals
- Joints using elastomer gaskets with pins, external frames or half-segments
- Special closing devices for valve bodies (e.g., plugs, nuts, O-rings)
- Design precautions: Emphasis on avoiding additional stresses or notches that could bias results (machining grooves and rib/profile choices must account for plastics’ notch sensitivity).
- Sampling and test-piece preparation: Requirements reference ISO 1167-1 for the number of specimens, conditioning at test temperature and reporting details.
- Reporting: Test report must identify the type of pressure-tight device and preparation method used.
Applications and who uses it
- Manufacturers of thermoplastic fittings, valves and piping systems - for type testing and product development.
- Test laboratories and certification bodies - to prepare components consistently for hydrostatic strength testing.
- Quality assurance and R&D teams - to validate component integrity, joint designs and material performance under internal pressure.
- Regulatory compliance and procurement professionals - to ensure components meet recognized test preparation practices for safety and conformity.
Practical uses include type approval testing, failure investigation, comparative evaluation of joint designs, and establishing reliable test methods for product certification.
Related standards
- ISO 1167-1:2006 - General method for determination of resistance to internal pressure
- ISO 1167-2 - Preparation of pipe test pieces
- ISO 1167-4 - Preparation of assemblies (covers polyolefin fusion assemblies)
Keywords: EN ISO 1167-3:2007, ISO 1167-3, thermoplastics pipes, fittings, valve bodies, hydrostatic pressure testing, preparation of components, pressure-tight devices, internal pressure resistance.
