ISO 3862:2020 pdf download – Rubber hoses and hose assemblies – Rubber-covered spiral-wire- reinforced hydraulic types for oil-based or water-based fluids – Specification
7.4.2 Water-based fluid impulse test
The impulse test shall be in accordance with ISO 6803 or ISO 6605. The test fluid temperature shall be 70 °C. The test fluid used shall be HFC, HFAE, HFAS or HFB as defined in ISO 6743-4. For type 4SP and 4SH hoses, when tested at a pressure equal to 133 % of the maximum working pressure, the hose shall withstand a minimum of 400 000 impulse cycles. For type R12 hoses, when tested at an impulse pressure equal to 133 % of the maximum working pressure, the hose shall withstand a minimum of 500 000 impulse cycles. For type R13 and R15 hoses, when tested at an impulse pressure equal to 120 % of the maximum working pressure, the hose shall withstand a minimum of 500 000 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.
For type 4SP and 4SH hoses, when tested at a pressure equal to 133 % of the maximum working pressure and a temperature of 100 °C, the hose shall withstand a minimum of 400 000 impulse cycles. For type R12 hoses, when tested at an impulse pressure equal to 133 % of the maximum working pressure and a temperature of 120 °C, the hose shall withstand a minimum of 500 000 impulse cycles. For type R13 and R15 hoses, when tested at an impulse pressure equal to 120 % of the maximum working pressure and a temperature of 120 °C, the hose shall withstand a minimum of 500 000 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 Low temperature flexibility
When tested in accordance with method B of ISO 10619-2:2017 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 between lining and reinforcement and between cover and reinforcement shall be no less than 2,5 kN/m for type 4SP and 4SH hoses and no less than 1,4 kN/m for type R12, R13 and R15 hoses.