ISO 9393-2:2005

Overview

ISO 9393-2:2005, "Thermoplastics valves for industrial applications - Pressure test methods and requirements - Part 2: Test conditions and basic requirements," specifies the test parameters and conditions for hydrostatic-pressure tests on valves made from common thermoplastic materials. The scope covers valves manufactured from ABS, PE (PE 80, PE 100), polypropylene variants (PP-H, PP-B, PP-R, PP-R-GF), PVC (PVC-C, PVC-U) and PVDF. The standard defines how to test the raw material, pressurized valve components (shell), and the complete valve under controlled conditions.

Key topics and technical requirements

• Test types covered
  • Material long-term hydrostatic testing (referencing ISO 9080 or equivalent)
  • Shell (pressurized component) tests
  • Long‑term behaviour tests on complete valves
  • Seat and packing tests (with general criteria from ISO 5208)
• Test conditions
  • Test pressures are derived from design stress and nominal pressure (PN) using the standard formula: p_test = (σ_test / σ_design) × PN.
  • Test fluids permitted include water or air (water is specified in case of dispute).
  • Temperature and duration ranges are specified per material and per test type to reflect real service conditions.
  • Special provisions for diaphragm valves (e.g., temperature and maximum pressure limits).
• Acceptance criteria
  • A specimen is satisfactory if no leakage, no rupture, and no visible failure occur during the defined test period.
  • Tests are considered null and void if external connections or pipes fail; such tests must be repeated on a new specimen.
• Seat and packing tests
  • Valve operation during tests must use the torque specified in the applicable product standard.
  • Pass criteria: no leakage through the seat or packing during the test period.

Applications and users

ISO 9393-2:2005 is directly applicable to:

• Valve manufacturers of thermoplastic industrial valves for quality control and design verification.
• Test laboratories and certification bodies performing hydrostatic and endurance testing.
• Design and R&D engineers specifying material selection, pressure ratings, and life expectancy.
• Procurement and QA teams who require objective test methods to verify compliance with pressure ratings.
• System integrators and plant owners who rely on validated valves for safe fluid transport in chemical, water, and process industries.

Using ISO 9393-2 helps ensure consistent, reproducible pressure-testing practices that align valve performance with declared PN ratings and design stresses.

Related standards

• ISO 9393-1:2004 - Thermoplastics valves - Part 1: General
• ISO 5208 - Industrial valves - Pressure testing of valves
• ISO 9080 - Long-term hydrostatic strength of thermoplastics (pipe form)
• ISO 15493 / ISO 15494 / ISO 10931 - Material and system specifications for ABS, PE, PP, PVC, PVDF

Keywords: ISO 9393-2:2005, thermoplastics valves, pressure test methods, hydrostatic-pressure tests, valve testing, PVC-U, PVDF, PE 100, ABS valves.