BS EN 857:2015 pdf download.Rubber hoses and hose assemblies – Wire braid reinforced compact type for hydraulic applications – Specification.
This European Standard specifies requirements for two types of wire braid reinforced compact hoses and hose assemblies of nominal bore from 6 to 25, types 1 SC and 2SC.
They are suitable for use with:
— hydraulic fluids in accordance with ISO 6743-4 with the exception of HFD R, HFD S and HFD T at temperatures ranging from -40 °C to +100 °C;
— water based fluids at temperatures ranging from -40 °C to +70 °C;
— water at temperatures ranging from 0 °C to +70 °C.
BS EN 857 does not include requirements for end fittings. It is limited to the performance of hoses and hose assemblies.
NOTE 1 The hoses are not suitable for use with castor oil based nor ester based fluids.
NOTE 2 Hoses and hose assemblies are not be operated outside the limits of this standard.
NOTE 3 Requirements for hydraulic hoses for underground mining are standardised in separate standards.
4 Materials and construction
4,1 Hoses
Hoses shall consist of an oil and water resistant synthetic rubber lining, one or two layers of high tensile steel
wire and an oil and weather resistant synthetic rubber cover.
4.2 Hose assemblies
Hose assemblies shall only be manufactured with those hose fittings whose functionality has been verified in accordance with subclauses 6.1, 6.3, 6.4 and 6.5 of this European Standard.
5 Dimensions
5.1 Diameters and concentricity
When measured in accordance with EN ISO 4671, the diameters of the hoses shall conform to the values given in Table 1.
6.3 Impulse test requirements
6.3.1 The impulse test shall be in accordance with EN ISO 6803. The test temperature shall be 100 °C.
6.3.2 For type 1SC hose, when tested at impulse pressure equal to 125 % of the maximum working pressure, the hose shall withstand a minimum of 150 000 impulse cycles.
For type 2SC hose, when tested at impulse pressure equal to 133 % of the maximum working pressure, the hose shall withstand a minimum of 200 000 impulse cycles.
6.3.3 There shall be no leakage or other malfunction before reaching the specified number of cycles.
6.3.4 This test shall be considered a destructive test and the test piece shall be disposed of in accordance with local environmental guidelines.
6.4 Leakage of hose assemblies
When tested in accordance with EN ISO 1402:2009, 8.4, there shall be no leakage or evidence of failure. This test shall be considered a destructive test and the test piece shall be disposed of in accordance with local environmental guidelines.