ISO 3862:2020 pdf free.Rubber hoses and hose assemblies——Rubber-covered spiral-wire-reinforced hydraulic types for oil-based or water-based fluids——Specification.
4 Classification
Five types of hoses are specified, distinguished by their construction, working pressure and oil resistance:
— ‘Iype 4SP: medium-pressure hoses with four plies of steel wire spiral.
— Type 4SH: high-pressure hoses with four plies of steel wire spiral.
— Type R12: heavy-duty high-temperature hoses with a medium-pressure rating having four plies of steel wire spiral.
— Type R13: heavy-duty high-temperature hoses with a high-pressure rating having a multiple-steel- wire spiral.
— Type R15: heavy-duty high-temperature hoses with an extra-high-pressure rating having a multiple- steel-wire spiral.
5 Materials and construction
5.1 Hoses
Hoses shall consist of a rubber lining resistant to oil- or water-based hydraulic fluids or water, spiral plies of steel wire wrapped in alternating directions, and an oil- and weather-resistant rubber cover. Each spiral wire ply shall be separated by an insulating layer.
5.2 Hose assemblies
Hose assemblies shall be manufactured using hoses conforming to the requirements of this document.
Hose assemblies shall be manufactured only with those hose fittings whose correct functioning has been verified in accordance with 7L2 24, 75 and ifi. The manufacturer’s instructions shall be followed for the preparation and fabrication of hose assemblies.
6 Dimensions
6.1 Hose diameters and hose concentricity
When measured in accordance with Iso 4671, the inside diameter of hoses shall conform to the values given in Table 1.
When measured in accordance with ISO 4671, the diameter over reinforcement of hoses shall conform to the values given in Table 2.
When measured in accordance with ISO 4671, the outside diameter of hoses shall conform to the values given in Table 3.
When measured in accordance with ISO 4671, the concentricity of hoses shall conform to the values given in Table 4.
6.2 Length
The length of supplied hoses and hose assemblies shall be the subject of agreement between the manufacturer and the purchaser.
NOTE Recommendations for supplied lengths of hoses and hose assemblies are given in Annex C.
7 Performance requirements
7.1 General
The requirements for type and routine testing are given in Annex A and recommendations for production acceptance testing in Annex B.
7.2 Hydrostatic requirements
When tested in accordance with Iso 1402 or ISO 6605 at the relevant proof pressure given in Table 5 and the relevant minimum burst pressure given in Table 6, the hoses and hose assemblies shall not leak.
When determined in accordance with ISO 1402 or ISO 6605, the change in length of hoses at the maximum working pressure (see Table 7) shall not exceed +2 % or —4 % for types 4SP and 4SH, or +2 % or —2 % for types R12, R13 and R15.
7.3 Minimum bend radius
When bent to the minimum bend radius given in Table 8, measured in accordance with method A1
of ISO 10619-1:2017, the hose shall conform, in the bent state, to the impulse and cold flexibility
requirements of 7.4 and 7.6. .
7.4 Resistance to impulse
7.4.1 Oil-based fluid impulse test
The impulse test shall be in accordance with Iso 6803 or ISO 6605. The test fluid temperature for type 4SP and 4SH hoses shall be 100 °C. The test fluid temperature for type R12, R13 and R15 hoses shall be 120 °C.
For type 4SP and 4SH hoses, when tested at an impulse 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.ISO 3862 pdf download.