BS ISO 4079:2015 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 fluids 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 fluids 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.