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ISO 15501-2:2016 pdf free

ISO 15501-2:2016 pdf free.Road vehicles一Compressed natural gas (CNG) fuel systems
a) There should be at least four points of attachment to the vehicle structure, the distance between which should be sufficient to ensure the stability of the cylinder.
b) Where the cylinder is anchored to sheet metal, the sheet metal should be reinforced at each attachment point with metal plates of areas of no less than 3 600 mm2 and a thickness of no less than 2,5 mm. Any such reinforcement plates should be contoured to the shape of the sheet metal or chassis rail. It is preferred that a round washer be used, but where a square plate is fitted the corners should be radiused to at least 0,5 mm and the bolt hole should be positioned in the centre of the plate/washer. Where the bolt hole is not central in the plate, the nearest edge should be bent to form an L-section for stiffening.
Flat areas, even if ribbed, can be unsuitable for mountings without substantial reinforcement,because of flexing and fatigue. Anchoring should be to structural members where possible.
c) The mounting method should not significantly weaken the vehicle structure.
d) Where anchorage bolts pass through a hollow section, a spacer tube should be provided to prevent collapse of that section under load.
e) All fasteners should have a diameter of no less than that shown in Table A.1 and should comply with property class 8.8 in accordance with ISO 898-1.
f) Where clamping bands are used, at least two steel bands should be provided, the dimensions of which should be no less than those shown in Table A.1. However, in the case of multiple cylinders mounted together, Table A.1 does not apply.
g) Where parts are joined (e.g. by welding a stud to a band), the strength of the joint should be not less than the strength of either component.ISO 15501-2 pdf free download.

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