Quality tests

FITTINGS

Stress corrosion test

Brass fittings, including sleeves, shall be free from internal tensional stresses and shall resist the mercury nitrate test or the ammonium test. Fittings shall show no evidence of cracking visible when 10-times magnified.

Resistance to tightening torque of fittings

Male fittings and swivel nuts shall resist a tightening torque without evidence of cracks or damage visible when 10-times magnified.

Resistance to bending

Fittings shall resist the minimum bending torques without evidence of cracks or damage visible when 10-times magnified.

Resistance to seat of female fitting

Female fittings shall resist the tightening torques without evidence of deformation or cracks visible when 10-times magnified.

FLOW RATE

Flow rate

Samples shall be taken for each DN type. The hose assemblies are considered to comply with requirements, when either the minimum diameter of the bore of all parts or the measured flow rate is in compliance with the requirements.

TENSILE STRESS RESISTANCE

Tensile stress resistance

Samples shall be taken for each DN type and treated at pressure of 1,2 MPa for 168 h at a temperature 90 +1/-3 °C. Hose assemblies shall be resistant to requirements a tensile stress. During and after this test, the hose assembly shall show no leakage or other damage.

UV RESISTANCE

UV resistance

When exposed to UV radiation of 3,5 GJ/(m2 · a) in accordance with EN ISO 877, Method C, the hose assembly with plastics braiding shall comply with the resistance to pressure jumps.

RESISTANCE TO TEMPERATURE CYCLING

Resistance to temperature cycling

Samples shall be taken for each DN type and treated at pressure of 1,2 MPa for 168 h at a temperature 90 +1/-3 °C. After 5.000 cycles, hose assemblies shall not show any sign of damage and leakage.

LEAK TIGHTNESS TEST

Leak tightness test under internal hydrostatic pressure

Samples shall be taken for each DN type and treated at pressure of 1,2 MPa for 168 h at a temperature 90 +1/-3 °C. When tested to an internal water pressure of 3,0 MPa, the hose assemblies shall not show signs of any leakage.

Pressure cycling resistance

Samples shall be taken for each DN type and treated at pressure of 1,2 MPa for 168 h at a temperature 90 +1/-3 °C. Hose assemblies shall withstand a pressure cycling in the range from 0,5 MPa to 3,0 MPa.

Resistance to pressure jumps

Samples shall be taken for each DN type and treated at pressure of 1,2 MPa for 168 h at a temperature 90 +1/-3 °C. When tested in the range from 0,5 MPa to 5,0 MPa, hose assemblies shall resist to pressure jump for 200 impulses.

FROST RESISTANCE

Frost resistance

Samples shall be taken for each DN type. After treatment at temperature of – 25 °C for 10 hours, hose assemblies shall not show any sign of damage and leakage.

CORROSION RESISTANCE

Resistance to corrosion

Samples shall be taken for each materials combination. Hose assemblies shall not show any corrosion defect when inspected in accordance with method described in EN 12540.

FLEXIBILITY

Flexibility

Samples shall be taken for each DN type. After the test ovality of hose assemblies shall not exceed 15 %.