BS ISO 8066-3:2020 pdf download.Rubber and patics hoses and hose ssemblies for automotive air conditioning一Speifiation.
6 Testing and performance requirements
6.1 Test conditions
The testing room shall be kept at standard temperature in accordance with ISO 23529. The temperature of the hoses or hose assemblies shall be stabilized for 24 h before testing.
6.2 Leakage
6.2.1 Method A for type test and production test
When determined in accordance with the procedure given in 6.2.2, the loss in mass of refrigerant shall be no greater than 10 % of the initial mass of the refrigerant and there shall be no visible deterioration in the hoses or hose assemblies.
6.2.2 Procedure for method A
Test three test pieces. Fill each test piece with R1234yf containing (10 ± 1) % refrigerant compatible lubrication oil. Maintain each test piece with the pressure listed in Table 2 for 24 h at a temperature of
80°C±2°C.
This test can be carried out separately or during the 24 h pre-conditioning period for the refrigerant loss test (see ) at 80 °C ± 2 °C. When the test is carried out separately from 6.3, use the procedure described in Annex A.
6.2.3 Method B for routine test
When determined in accordance with the procedure given in 6.2.4, there shall be no leak and no visible deterioration in the hoses or hose assemblies. When pricked hose is tested, gas bubbles which form on the surface of the hose and decrease gradually after pressurizing may be observed but not be considered as a leak.
6.2.4 Procedure for method B
Immerse the test assembly in the water bath. Apply gas (air or inert gases) pressure and maintain the pressure listed in Table 2 for S mm. Also, a gas leak detector, snoop liquid leak detector may be applied to check leakage under the pressure listed in Table 2 for 5 mm.
6.3 Refrigerant permeation
6.3.1 Requirement
When determined in accordance with the procedure described in 6.3.2. the loss of refrigerant from the hoses or hose assemblies shall be no greater than the values given in Table 5.
6.4 Ageing
6.4.1 Requirement
When tested in accordance with 6.4.2, there shall be no leak and no cracks in a test hose or hose assembly.
6.4.2 Procedure
Wind a hose or hose assembly, of length between 300 mm and 1 000 mm, on to a mandrel having a
diameter eight times the outside diameter of the hose. Place the mandrel and hose or hose assembly in a
circulating-air oven for 168 h at 125 °C ± 2 °C.
Take the mandrel and hose or hose assembly out of the oven, allow to cool to ambient temperature, unwind the hose or hose assembly and examine it externally for any cracks, disintegration or other defects. Then test the hose or hose assembly in accordance with the procedure given in 6.2.3 and 6.2.4.
6.5 Low-temperature test
When tested in accordance with the method described in Annex B, there shall be no leak or loss due to cracks or splits.
6.6 Vacuum resistance
6.6.1 General
A hose or hose assembly shall be subjected, consecutively, to the vacuum test, then the length variation test (7), then the burst test ().
6.6.2 Requirement
The decrease in the outside diameter of the hose shall not exceed 20 % of the initial outside diameter and there shall be no obstruction of flow caused by the hose collapse when the hose or hose assembly is subjected to a reduced internal pressure (vacuum) of 1,33 kPa ± 0,66 kPa (absolute) for 2 mm in accordance with 6.6.3.BS ISO 8066-3 pdf download.