BS EN 857:2015 pdf download

BS EN 857:2015 pdf download.Rubber hoses and hose assemblies – Wire braid reinforced compact type for hydraulic applications – Specification.
BS EN 857 specifies requirements for two types of wire braid reinforced compact hoses and hose assemblies of nominal bore from 6 to 25, types 1SC 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.
This European Standard 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.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3 Types of hoses
Two types of hoses are specified:
1) type I SC — hoses with a single braid of wire reinforcement;
2) type 25C — hoses with two braids of wire reinforcement.
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 Requirements
6.1 Hydrostatic requirements
6.1.1 When tested in accordance with EN ISo 1402, the maximum working pressure, the proof pressure and burst pressure of the hoses and hose assemblies shall conform to the values given in Table 4.
6.1.2 When tested in accordance with EN ISO 1402, the change in length of hose at the maximum working pressure shall not exceed +2 % to -4 %.
6.2 Minimum bend radius
When bent to the minimum bend radius given in Table 5, measured on the inside of the bend, the flatness shall not exceed 10 % of the original outside diameter.
Measure the hose outside diameter with a calliper before bending the hose. Bend the hose to the minimum bend radius and measure the flatness with the calliper.BS EN 857 pdf download.