BS EN 856:2015 pdf download.Rubber hoses and hose assemblies – Rubber-covered spiral wire reinforced hydraulic type – Specification.
BS EN 856 specifies requirements for four types of rubber-covered spiral wire reinforced hydraulic hoses and hose assemblies of nominal bore from 6 to 51: Types 4SP, 4SH, R12 and R13. They are all 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 for types 4SP and 4SH and —40 °C to +120 °C for types R12 and R13;
— water based fluids at temperatures ranging from —40 °C to 70 °C;
— water fluids 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 a separate standard.
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.
EN ISO 1302, Geometrical Product Specifications (GPS) – Indication of surface texture in technical product documentation (ISO 1302)
EN ISO 1402:2009, Rubber and plastics hoses and hose assemblies – Hydrostatic testing (ISO 1402:2009)
EN ISO 4671, Rubber and plastics hoses and hose assemblies – Methods of measurement of the dimensions
of hoses and the lengths of hose assemblies (ISO 4671)
EN ISO 6743-4, Lubricants, industrial oils and related products (class L) – Classification – Part 4: Family H
(Hydraulic systems) (ISO 6 743-4)
EN ISO 6803, Rubber or plastics hoses and hose assemblies – Hydraulic-pressure impulse test without flexing (ISO 6803)
EN ISO 7326, Rubber and plastics hoses – Assessment of ozone resistance under static conditions (ISO 7326)
3 Types of hose
Four types of hose are specified:
1) Type 4SP — a 4-steel wire spiral medium pressure hose;
2) Type 4SH — a 4-steel wire spiral extra high pressure hose;
3) Type R12 — a 4 steel wire spiral heavy duty high temperature hose — medium pressure rating;
4) Type R13 — a multiple steel wire spiral heavy duty high temperature hose — high pressure rating.
4 Materials and construction
4.1 Hoses
Hoses shall consist of an oil and water resistant synthetic rubber lining, spiral plies of steel wire wrapped in alternating directions, and an oil and weather resistant synthetic rubber cover. Each spiral wire ply shall be separated by an insulating layer of synthetic wbber.
4.2 Hose assemblies
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 for types4SPand4SH and 120 C fortypes R12 and R13.
6.3.2 For types 4SP and 4SH hose, when tested at impulse pressure equal to 133 % of the maximum working pressure, the hose shall withstand a minimum of 400 000 impulse cycles.
For type R12 hose, tested at impulse pressure equal to 133 % of the maximum working pressure, the hose shall withstand a minimum of 500 000 impulse cycles.
For type R13 hose, tested at impulse pressure equal to 120 % of the maximum working pressure, the hose shall withstand a minimum of 500 000 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.Download BS EN 856 pdf.