ISO 15501-1:2016 pdf free

ISO 15501-1:2016 pdf free.Road vehicles一Compressed natural gas (CNG) fuel systems
The cylinder or parts of the gas system, or both, shall be mounted in a position which ensures that any leaking or venting gas from the fuel systems does not directly enter the driver or passenger compartment, boot or other spaces not sufficiently ventilated. Alternatively, it shall be ensured that any leaked gas will be directed safely to the atmosphere (see Annex A).
Where a cylinder is located within the driver or passenger compartment or other insufficiently ventilated space, the valves, connections and pipework shall be enclosed in a gas-tight housing such that any gas leakage is vented and directed to the outside of the vehicle. When the valves are self-venting, the gas tight housing/ventilation hose shall enclose the connections, pipework and venting orifices. There is no need to enclose the body of the valve, if all the possible leakage sources (included the cylinder-valve interface) are sealed and vented into the valve’s interior venting passages.
In case of fire, the requirement of venting gas to the outside of the vehicle does not apply.
Mounting hardware and instructions specified by the cylinder manufacturer shall be used, if available.The mounting system shall minimize damage or corrosion between the cylinder and the mounting system.
A resilient gasket that does not retain water shall be installed between the supports or clamping bands and a fuel cylinder such that there is no direct contact between metal on the bracket and the fuel cylinder. The gasket material shall be of a thickness and hardness such that the fuel cylinder will remain secure at all fuel cylinder fill pressures and all operating temperatures.
When the cylinder is clamped by the neck, a resilient gasket might not be required. When installing the cylinder, consideration should be given to factors such as the undue stresses created in an overwrap by cylinder expansion against a metal support, the need to specify a gasket material to prevent support damage to cylinders, and the required properties of any gasket material. Type 2,Type 3, and Type 4 designs should be provided with shielding arrangements to protect the composite wrapping from mechanical damage.
Gas cylinder and attachments for mounting on the vehicle shall be constructed so that the mountings are not be subject to failure by wear, corrosion or fatigue during the service life of the vehicle.Welding on cylinders is not permitted.ISO 15501-1 pdf free.