Overview
EN ISO 22391-5:2009/A1:2020 is Amendment 1 to Part 5 of the ISO 22391 series covering plastics piping systems for hot and cold water installations using Polyethylene of Raised Temperature resistance (PE-RT). This amendment (corrected version 2021-03) updates normative references, test methods and specific test parameters used to demonstrate the fitness for purpose of PE-RT piping systems.
Key features of this amendment include replacement of legacy EN normative references with corresponding ISO test standards, clarified requirements for bendable pipe declarations, and revised tables for thermal cycling and pressure cycling tests.
Key Topics
-
Normative references updated: EN references are replaced by ISO equivalents to align test methods. Key replacements in the amendment:
- EN 712 → ISO 3501 (pull-out under constant longitudinal force)
- EN 713 → ISO 3503 (leaktightness under internal pressure while subjected to bending)
- EN 12293 → ISO 19893 (resistance of mounted assemblies to temperature cycling)
- EN 12294 → ISO 13056 (leaktightness under vacuum)
- EN 12295 → ISO 19892 (resistance of joints to pressure cycling)
-
Thermal cycling (Table 7) - test parameters revised for application classes 1, 2, 4 and 5:
- Maximum design temperatures (Tmax): Class 1: 80 °C, Class 2: 80 °C, Class 4: 70 °C, Class 5: 90 °C
- Highest/lowest test temperatures: 90/20 °C, 90/20 °C, 80/20 °C, 95/20 °C respectively
- Number of cycles: d ≤ 160 mm: 5 000 cycles; d > 160 mm: 500 cycles
- Cycle durations (footnotes): short cycle = 15 min high / 15 min low (30 min total); long cycle = 150 min high / 150 min low (300 min total)
- Test assemblies: minimum pipe connectors/connection counts per ISO 19893; free pipe length between joints not less than 150 mm.
-
Pressure cycling (Table 8) - requirements updated:
- Test method: ISO 19892 at 23 °C
- Number of test pieces: 3
- Frequency: d ≤ 160 mm: (30 ± 5) cycles/min; d > 160 mm: (15 ± 3) cycles/min
- Number of cycles: d ≤ 160 mm: 10 000; d > 160 mm: 5 000
- Test pressure limits for design pressures: for 4 bar → upper 6.0 / lower 0.5 bar; 6 bar → 9.0 / 0.5; 8 bar → 12.0 / 0.5; 10 bar → 15.0 / 0.5.
Applications
This amendment is directly relevant to:
- Manufacturers, system suppliers and testing laboratories working with PE-RT piping systems for potable hot and cold water.
- Product conformity and system validation processes that require thermal cycling and pressure cycling tests to verify long-term performance and leak tightness.
- Specifiers and installers seeking harmonized, up-to-date test criteria for system fitness and safety across CEN/ISO jurisdictions.
Related Standards
This amendment was prepared by ISO/TC 138 in collaboration with CEN/TC 155 and was endorsed as EN ISO 22391-5:2009/A1:2020 (corrected 2021-03). For implementation, refer to the full published text and national adoption details from CEN or your national standards body.
