ISO 8789:2020 pdf free download.Rubber hoses and hose assemblies for liquefied petroleum gas in motor vehicles — Specification.
This document specifies the requirements for rubber hoses and hose assemblies, up to a maximum hose size of 19, for use in motor vehicles with liquefied petroleum gas (LPG) installations. The hoses are designed for use up to a maximum working pressure of 3,0 MPa (30 bar) and at working temperatures from −40 °C up to and including +80 °C.
ISO 8789:2020 has been developed to harmonize international requirements for LPG hoses and hose accemblies used in motor vehicles, for instance United Nations Regulation No. 67.
2 Normative references
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments)applies
ISO 37, Rubber, vulcanized or thermoplastic-Determination of tensile stress-strain properties;
ISO 68-1, ISO general purpose screw threads – Basic profile- Part 1: Metric screw threads;
ISO 188:2011, Rubber, vulcanized or thermoplastic- Accelerated ageing and heat resistance tests;
ISO 1402, Rubber and plastics hoses and hose assemblies- Hydrostatic testing;
ISO 1817, Rubber, vulcanized or thermoplastic-Determination of the effect of liquids;
ISO 4080:2009, Rubber and plastics hoses and hose assemblies-Determination of permea bility to gas;
ISO 7326: 2016, Rubber and plastics hoses-Assessment of ozone resistance under static conditions;
4.2 Construction
The lining and cover shall be of uniform thickness, concentric and free from holes, porosity and other defects. The cover finish may be smooth or fabric-marked. To avoid the formation of bubbles due to gas permeation, the cover shall be pin-pricked.
NOTE:There is a possibility that national regulations define the type of reinforcement to be used.