EN 853-2015 pdf download.Rubber hoses and hose assemblies – Wire braid reinforced hydraulic type – Specification.
3 Types of hoses
Four types of hoses are specified:
1) Type 1ST – hoses with a single braid of wire reinforcement;
2) Type 2ST – hoses with two braids of wire reinforcement:
3) Type 1 SN- hoses with a single braid of wire reinforcement:
4) Type 2SN – hoses with two braids of wire reinforcement.
Types 1 SN and 2SN shall be of the same reinforcement construction as types 1ST and 2ST, except that they shall have thinner covers designed to assemble with fittings that do not require removal of the cover or a portion of the cover.
4 Materials and construction
4.1 Hoses
Hoses shall consist of an oil and water resistant synthetic rubber lining, one or two layers of nigh tensile steel wire and an oil and weather resistant rubber cover
4.2 Hose assemblies
Hose assemblies shall only be manufactured with those hose fillings 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.
5.2 Length
5.2.1 Hoses
Hoses shall be supplied in lengths as specified by the purchaser. subject to a tolerance on the specified lengths of ± 2 %.
When no specific hose lengths have been ordered, the percentages of different lengths in any given delivery
shall be as follows:
— over 20 m not less than 80 % of total length;
— over 10 m to 20 m : not more than 20 % of total length:
— 1 mtol0m :not more than3%of total length.
The length of hose shall be at least 1 m.
5.2.2 Hose assemblies
The tolerances on the ‘ength of hose assemblies shall conform to Table 3.
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 1ST and 1SN hoses, when tested at impulse pressure equal to 125 % of the maximum working pressure for hoses of nominal bore 25 and smaller, and at 100 % of the maximum working pressure for nominal bore 31 and above, the hose shall withstand a minimum of 150 000 impulse cycles.
For type 2ST and 2SN hoses, 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.
6.5 Cold flexibility
When tested in accordance with Method B of EN ISO 10619-2 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 EN ISO 1402 after regaining ambient temperature.
6.6 Adhesion between components
When tested in accordance with EN ISO 8033, the adhesion between lining and reinforcement, and between cover and reinforcement shall not be less than 2,5 kNIm,
Test pieces shall be Type 5 for lining and reinforcement and Type 2 or Type 6 or Type 8 for cover and reinforcement as described in Table I of EN ISO 8033:2006.
6.7 Vacuum resistance
When tested in accordance with EN ISO 7233. the hoses and hose assemblies shall conform to the values given in Table 6.
6.8 Abrasion resistance
All hose types shall be tested in accordance with Annex A.
For hose types 1ST and 2ST when tested with a vertical force of (50 ± 0,5) N the loss of mass alter 2 000 cycles shall not be greater than 1 g for the average value of three or more test pieces.
For hose types 1SN and 2SN when tested with a vertical force of (25 ± 0,5) N the loss of mass after 2 000 cycles shall not be greater than 0,5 g for the average value of three or more test pieces.
6.9 Fluid resistance
6.9.1 Test pieces
The fluid resistance tests shall be carried out on moulded sheets of lining and cover compound. 2 mm minimum thickness, of equivalent cure state to that of the hose.
6.9.2 Oil resistance
When tested in accordance with ISO 1817. the lining immersed in oil No. 3 for 168 h at a temperature of
100 C shall show no shrinkage and no volume swelling greater than 25 %.
When tested In accordance with ISO 1817, the cover immersed in oil No, 3 for 168 h at a temperature of 70 ‘C
shall show no shrinkage and no volume swelling greater than 100 %.
6.9.3 Water based fluid resistance
When tested in accordance with ISO 1817, the lining and cover immersed in a test liquid made up of equal volumes of 1 ,2-ethanediol and distilled water for 168 h at a temperature of 70 ‘C shall show no shrinkage. The volume swelling shall be not greater than 25 % for lining and 100 % for cover.
6.9.4 Water resistance
When tested in accordance with ISO 1817. the lining and cover immersed in distilled water for 168 h at a temperature of 70 C shall show no shrinkage. The volume swelling shall be not greater than 25 % for lining and 100 % for cover.
6.10 Ozone resistance
The test shall be in accordance with EN ISO 7326, Method 1 or 2, depending on the nominal bore of the hose. There shall be no cracking and no deterioration of the cover visible under x2 magnification.EN 853-2015 pdf download.