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ISO 15500-19-2012 pdf free download
ISO 15500-19-2012 pdf free download.Road vehicles — Compressed natural gas (CNG) fuel system components — Part 19:Fittings
Véhicules routiers — Corn posants des systèmes de combustible gaz naturel comprimé (GNC) — Partie 19: Raccords.
6.2 Hydrostatic strength
Test the fitting according to the procedure for testing hydrostatic strength specified in Iso 15500-2. The test pressure shall be four times the working pressure.
NOTE The higher hydrostahc test pressure for the fittings compared to the other components n the other parts of the ISO 15500 series is due to consistency with fuel line provisions.
6.3 Continued operation
Test the fitting in accordance with the procedure for testing continued operation given in Iso 15500-2 for a total of 100 000 cycles. The fitting shall only be tested while connected with a rigid fuel line.
Following cycling testing, perform the leak test specified by ISO 15500-2, then the hydrostatic strength test in accordance with 6.2 of this part of ISO 15500.
6.4 Vibration resistance
Vibrate the fitting assembly, pressurized to its working pressure and sealed at both ends, for 30 mm along each
of the three orthogonal axes at the most severe resonant frequencies determined as follows:
— by an acceleration of 1,5 g:
— within a sinusoidal frequency range of 10 Hz to 500 Hz;
— with a sweep time of 10 mm.
If the resonance frequency is not found in this range, the test shall be conducted at 500 Hz.
At the completion of the test, the component shall not show any indication of fatigue or component damage, and shall meet the leakage test requirements specified in ISO 15500-2 and the hydrostatic strength test in accordance with 6.2 of this part of ISO 15500.
6.5 Pull oft
Test the fitting, attached to its rigid fuel line and coupled to its mating part or parts, according to the following procedure and acceptance criterion. Secure the subject specimen in an appropriate test fixture, then statically apply a tensile load along the rigid fuel line axis at a maximum rate of 250 N/mm until the rigid fuel line separates from the fitting.
The force (F) in newtons, required to pull apart the rigid fuel line from its fitting, as measured in the previous test, shall be higher than the one calculated as:ISO 15500-19-2012 pdf free download.
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