ISO 15500-13-2012 pdf free download

ISO 15500-13-2012 pdf free download.Road vehicles — Compressed natural gas (CNG) fuel system components — Part 13:Pressure relief device (PRO)
Véhicules routiers — Corn posants des systèmes de combustible gaz naturel comprimé (GNC) — Partie 13: Dispositits de limitation de pression.
67.4.1 Test procedure
a) Test the thermally-activated part of the PRO following the tests of 6.7.2.
b) Activate the pressure-activated part of the PRD by pressurizing until the rupture disc bursts.
6.7.4.2 Requirements
The PRDs subjected to the tests of 6.5, 6.8,6.9 and the corrosion-resistance and vibration tests of ISO 15500-2, shall be subjected to the test procedure in 6.7.2.2 and meet the following requirements:
a) the thermal part of the PRDs shall meet the requirements of 6.7.2.3:
b) the pressure-activated part shall activate at a pressure > % and < 105 % of the activation pressure of a PRD not subjected to any previous testing.
The PRD assembly shall be cycled 1.000 times between not more than 10 % of the manufacturer’s specified service pressure and not less than 100 % of the manufacturer’s specified working pressure. This test shall be conducted at ambient temperature. The maximum pressure cycling rate is 10 cycles per minute. Following this test, the PRD shall be activated by pressurizing until the device relieves pressure.
The PRDs subjected to pressure cycling, thermal cycling, salt corrosion resistance, gas condensate corrosion resistance and impact due to drop and vibration, shall activate at a pressure which is at least 130 % of the manufacturer’s specified service pressure, and is at least 75 % of the activation pressure, but is not more than 105 % of the activation pressure, of the PRD which had not been subjected to previous design qualification tests.
6.8 Thermal cycling
6.8.1 Test procedure
Thermally cycle the PRD between —40 °C or —20 °C as applicable and 82 °C or higher, as follows:
a) Place a depressurized PRD in a fluid bath maintained at —40 °C or —20 °C as applicable or lower for a period of 2 h or more. Then transfer the device to a fluid bath maintained at 82 C or higher within 5 mm of having removed it from the cold bath.
b) Leave the depressurized PRD in the fluid bath maintained at 82 °C or higher for a period of 2 h or more. Then transfer the device to the fluid bath maintained at -40 °C or 20 °C as applicable or lower within 5 mm of having removed it from the hot bath.
C) Repeat steps a) and b) until a total of 15 thermal cycles have been achieved.
d) With the PRO conditioned for a period of 2 h or more in the fluid bath of -40 °C or -20 °C as applicable, cycle the PRO between no more than 10 % and no less than 100 % of the service pressure for a total of 100 cycles.ISO 15500-13-2012 pdf free download.