BS ISO 06605:2017 pdf download – Hydraulic fluid power – Test methods for hoses and hose assemblies 5.1.4.4 Take readings at 90° (1,57 rad) intervals around the hose. Acceptability is based on the total variation between the highest and lowest readings. 5.2 Proof test 5.2.1 Test the hose assemblies hydrostatically to the specified proof pressure in accordance with the relevant product specification using the method specified in ISO 1402, for a period of between 30 s and 60 s for all sizes. The proof pressure shall be twice the maximum working pressure, unless otherwise specified. 5.2.2 Hose assemblies that exhibit no leakage or other evidence of failure after being subjected to the proof test shall be deemed to have passed the test. 5.3 Change-in-length test 5.3.1 Conduct measurements for the determination of elongation or contraction on a previously unused, unaged hose assembly having a free length between hose fttings of at least 600 mm. 5.3.2 Attach the hose assembly to the pressure source in an unrestricted straight position. If the hose is not straight due to its natural curvature, it may be fastened laterally to achieve a straight position. Pressurize to the maximum working pressure for a period of 30 s, then release the pressure. 5.3.3 Place accurate reference marks 500 mm (lo) apart on the outer cover of the hose, midway between hose fittings, after allowing the hose assembly to restabilize for a period. of 30 s following pressure release. 5.3.4 Repressurize the hose assembly to the specified maximum working pressure for a period of 30 s. 5.3.5 Measure the distance between reference marks while the hose is pressurized and record this as l1. 5.3.6 Determine the change in length using Formula (1] in accordance with ISO 1402: where lo is the distance between the reference marks after the hose assembly restabilizes pressurized following the initial pressurization and release of pressure, in millimetres; l1 is the distance between the reference marks while the hose assembly is under pressure, in millimetres; . Ot is the percentage change in length, which will be positive (+) in the case of an increase in length and negative [-) in the case of a decrease in length. 5.4 Burst test 5.4.1 General This is a destructive test. Hose or hose assemblies that have been subjected to this test should be destroyed. 5.4.2 Procedure 54.2.1 Subject unaged hose or hose assemblies, on which the hose...
Download Address
Download