Overview
ISO 27127:2021 - Thermoplastic multi-layer (non‑vulcanized) hoses and hose assemblies for the transfer of liquid petroleum gas and liquefied natural gas - Specification - defines construction, dimensional and performance requirements for thermoplastic multi‑layer transfer hoses and assemblies used for LPG and LNG transfer. The standard covers two hose types (each split into Class A - onshore and Class B - offshore) for sizes from 25 mm to 250 mm, working pressures up to 25 bar, and operating temperatures down to −196 °C for cryogenic LNG applications.
Key topics and technical requirements
- Scope & classification: Two types × two classes (onshore/offshore) with specified maximum working, proof and minimum burst pressures and temperature ranges.
- Materials & construction: Multi‑ply thermoplastic film/fabric core with internal and external austenitic stainless steel wire helixes (specified grades). Outer layer color may be agreed between manufacturer and purchaser.
- Dimensions & tolerances:
- Inside diameters and tolerances per ISO 4671
- Minimum bend radii specified by size (no kinking allowed)
- Length tolerance for hose assemblies: +2 % / −1 %
- Performance & testing:
- Hydrostatic/proof and burst pressure tests per ISO 1402
- Change in length, twist at proof pressure, crush recovery (Annex A)
- Low‑temperature flexibility (ISO 10619‑2), thermal ageing (Annex B), ozone resistance (ISO 7326)
- Flammability testing (Annex G) and leak tightness (Annex F)
- Electrical continuity/conductivity requirements between end fittings (ISO 8031 referenced)
- End fittings & assemblies: Material and mechanical requirements for fittings and ferrules, plus assembly tests and marking rules.
- Marking & documentation: Hose and assembly identification requirements for safe use and traceability.
Practical applications and users
ISO 27127:2021 is intended for:
- Manufacturers of thermoplastic multi‑layer LPG/LNG hoses and hose assemblies
- Test laboratories performing type, routine and batch testing
- Oil & gas operators, marine terminals, bunkering and gas transfer service providers
- Procurement, inspection and compliance teams specifying hoses for onshore and offshore LPG/LNG transfer
Practical uses include cryogenic transfer lines, loading/unloading hoses at terminals, and other LPG/LNG transfer operations where a thermoplastic, multi‑layer, non‑vulcanized hose is preferred.
Related standards
- ISO 1402 (hydrostatic testing)
- ISO 4671 (dimension measurement)
- ISO 10619‑1 / ISO 10619‑2 (flexibility & bending tests)
- ISO 8031 (electrical resistance/conductivity)
- ISO 7326 (ozone resistance)
- EN 1474‑2 (offshore LNG hose assemblies / ship‑to‑shore transfer) - noted as related for offshore LNG applications
Keywords: ISO 27127:2021, thermoplastic multi‑layer hoses, LNG hose assemblies, LPG transfer hoses, cryogenic hoses, Class A onshore, Class B offshore, proof pressure, burst pressure, minimum bend radius.