ISO 2928:2021

Overview

ISO 2928:2021 - Rubber hoses and hose assemblies for liquefied petroleum gas (LPG) and natural gas up to 2,5 MPa (25 bar) - specifies construction, materials, dimensions, performance and testing requirements for rubber hoses and hose assemblies used to transfer LPG (liquid or gaseous) and natural gas. The standard covers working pressures from vacuum up to 2,5 MPa and temperature ranges −30 °C to +70 °C, or −50 °C to +70 °C for low‑temperature (-LT) hoses.

Key topics and technical requirements

• Classification and types: delivery (D, D‑LT) and suction/delivery helix‑reinforced types (SD, SD‑LTR, SD‑LTS), with electrical designations for bonded (M), conducting (Ω) or discontinuous hoses.
• Materials & construction: n‑pentane‑resistant rubber lining; textile or wire reinforcement; abrasion‑ and weather‑resistant rubber cover; pricked or unpricked covers (permeation checks where required).
• Dimensions & tolerances: nominal sizes and inside/outside diameters with specified tolerances, design minimum bend radii, minimum lining/cover thickness 1,6 mm, concentricity limits and ±1 % length tolerance.
• Physical properties: compound and finished hose criteria - minimum tensile strength 10 MPa, minimum elongation 250 %, abrasion limits, ageing and liquid‑resistance requirements (tests per ISO 37, ISO 48‑2, ISO 188, ISO 1817, ISO 4649).
• Pressure & mechanical tests: proof test (min. 3,75 MPa), burst pressure (min. 10 MPa), adhesion, suction resistance for SD types (ISO 1402, ISO 7233, ISO 8033).
• Electrical resistance & bonding: requirements for electrically bonded or conducting hoses and guidance for couplings to ensure electrical properties (ISO 8031).
• Testing frequency & marking: specified type, routine and production acceptance tests; marking requirements for hoses and assembled hoses. Annexes include flammability testing and recommended test frequencies.

Applications and users

ISO 2928:2021 is intended for:

• Manufacturers of rubber hoses and hose assemblies for LPG dispensers, vehicle refuelling, tanker unloading, and industrial gas transfer systems.
• Hose assemblers and fitting manufacturers who must meet electrical bonding and coupling requirements.