BS ISO 4079:2016 pdf download – Rubber hoses and hose assemblies — Textile-reinforced hydraulic types for oil-based or water-based fluids — Specification

BS ISO 4079:2016 pdf download – Rubber hoses and hose assemblies — Textile-reinforced hydraulic types for oil-based or water-based fluids — Specification
7.4 Resistance to impulse
7.4.1 Water-based fluid impulse test The impulse test shall be performed on hose types 2TE, 3TE and R3 in accordance with ISO 6803 or ISO 6605. The test fluid temperature shall be 60 °C. The test fluid shall be selected from HFC, HFAE, HFAS, and HFB as defined in ISO 6743-4.
NOTE The impulse test is not required for types 1TE and R6. For type 2TE hoses, when tested at an impulse pressure equal to 125 % of the maximum working pressure, the hose shall withstand a minimum of 100 000 impulse cycles. For type 3TE and R3 hoses, when tested at an impulse pressure equal to 133 % of the maximum working pressure for hoses of nominal bore up to and including 25 or at 100 % of the maximum working pressure for hoses of nominal bore greater than 25, the hose shall withstand a minimum of 200 000 impulse cycles. There shall be no leakage or other evidence of failure before reaching the specified number of cycles. This test shall be considered a destructive test and the test piece shall be discarded after the test.
7.4.2 Oil-based fluid impulse test The impulse test shall be in accordance with ISO 6803 or ISO 6605. The test fluid temperature shall be 60 °C. The impulse test shall be performed on hose types 2TE, 3TE and R3 in accordance with ISO 6803 or ISO 6605, using oil-based hydraulic fluid as required by ISO 6803 or ISO 6605 at a fluid temperature of 100 °C.
NOTE The impulse test is not required for types 1TE and R6. For type 2TE hoses, when tested at an impulse pressure equal to 125 % of the maximum working pressure, the hose shall withstand a minimum of 100 000 impulse cycles. For type 3TE and R3 hoses, when tested at an impulse pressure equal to 133 % of the maximum working pressure for hoses of nominal size up to and including 25 or at 100 % of the maximum working pressure for hoses of nominal size greater than 25, the hose shall withstand a minimum of 200 000 impulse cycles. There shall be no leakage or other evidence of failure before reaching the specified number of cycles. This test shall be considered a destructive test and the test piece shall be discarded after the test.
7.4.3 Optional impulse test The following test may be used to maximize test efficiency: a) oven-age assemblies filled with one of the water-based fluids specified in 7.4.1 for 120 h at 60 °C; b) impulse-test the aged assemblies using an oil-based hydraulic fluid as specified in ISO 6803 or ISO 6605 at a temperature of 100 °C. For type 2TE hoses, when tested at an impulse pressure equal to 125 % of the maximum working pressure, the hose shall withstand a minimum of 100 000 impulse cycles. For type 3TE and R3 hoses, when tested at an impulse pressure equal to 133 % of the maximum working pressure for hoses of nominal bore up to and including 25 or at 100 % of the maximum working pressure for hoses of nominal bore greater than 25, the hose shall withstand a minimum of 200 000 impulse cycles. There shall be no leakage or other evidence of failure before reaching the specified number of cycles. This test shall be considered a destructive test and the test piece shall be discarded after the test.
7.5 Leakage of hose assemblies When tested in accordance with ISO 1402 or ISO 6605, there shall be no leakage or other evidence of failure. This test shall be considered a destructive test and the test piece shall be discarded after the test.
7.6 Cold flexibility When tested in accordance with method B of ISO 10619-2:2011 at a temperature of −40 °C, there shall be no cracking of the lining or cover. The test piece shall not leak or crack when subjected to a proof pressure test in accordance with ISO 1402 or ISO 6605 after regaining ambient temperature.
7.7 Adhesion between components When determined in accordance with ISO 8033, the adhesion for hose types 1TE, 2TE and 3TE shall be in accordance with Table 7. For hose types R3 and R6, the adhesion between lining and reinforcement, and between cover and reinforcement, shall not be less than 1,4 kN/m.