ISO 8789:2020 pdf download – Rubber hoses and hose assemblies for liquefied petroleum gas in motor vehicles — Specification.
8 Requirements for fittings 8.1 Fitting material The fittings shall be made of stainless steel, brass or plated ferrous material to prevent corrosion. 8.2 Fitting description Fittings of the crimp-on type or of the reusable screw-together type shall be used. The swivel nut shall be provided with a UNF thread (in accordance with ASME B1.1 for inch threads) or in accordance with ISO 68-1 for metric threads, and sealing is preferably by means of a 45° flare. Other types of sealing surface are acceptable provided the hose assembly meets the test requirements. The fitting design shall be such that the fittings can be applied without removal of any cover material. NOTE There is a possibility that the material specifications and the type of fitting used are affected by national regulations. 9 Requirements for hose assemblies 9.1 Leakage test When the hose assembly which has be prepared from a hose (400 ± 10) mm long and filled with a propane gas at a pressure of 3,0 MPa (30 bar) is immersed in water for a period of 5 min, the assembly shall not show any sign of leakage while underwater. 9.2 Minimum burst pressure, proof pressure and permeability to propane Hose assemblies shall meet the requirement as specified in Table 3. 9.3 Visual examination Hose assemblies shall be inspected to verify that the correct fittings are fitted and that the hose assembly identification has been properly applied.
10 Frequency of testing Type testing and routine testing shall be as specified in Table A.1. Type tests are those tests required to confirm that a particular hose or hose assembly design, manufactured by a particular method from particular materials, meets all the requirements of this document. The tests shall be repeated at a maximum of five-year intervals, or whenever a change in the method of manufacture or materials used occurs. They shall be performed as specified in the product standard except those of the same size and construction. Routine tests are those tests required to be carried out on each length of finished hose or hose assembly prior to dispatch. Production acceptance tests are those tests, specified in Table B.1, which should preferably be carried out to control the quality of manufacture. The frequencies specified in Annex B are given as a guide only. 11 Marking 11.1 Hose marking Hoses shall be legibly and durably marked every 750 mm with at least the following information: a) the manufacturer’s name or identification, e.g. XXX; b) a reference to this document, i.e. ISO 8789; c) the nominal size of the hose, e.g. 10; d) the identification “LPG”; e) the maximum working pressure, in megapascals and in bars, or in either, with the units indicated, e.g. 3,0 MPa (30 bar); f) the quarter and the last two digits of the year of manufacture, e.g. 3Q19 (other date-coding methods are allowed as long as they are clear to the user). EXAMPLE XXX/ISO 8789/10/LPG/3,0 MPa (30 bar)/3Q19. For item b), the hose manufacturer shall use the latest publication of this document; otherwise, the year of publication shall be included in the marking.