BS EN ISO 21487:2012+A2:2015,Small craft – Permanently installed petrol and diesel fuel tanks.
BS EN ISO 21487:2012+A2:2015 establishes requirements for design and test of petrol and diesel fuel tanks for intemal combustion engines that are intended to be perma nently in stalled in small craft of up to 24 m length of hullFor installation requirements, ISO 10088 applies.
4 General properties
4.1 Resistance to liquids in contact
4.1.1 All seals such as gaskets, o.rings andjoint-rings shall be of non-wicking, i. e. non-fuel absorbent, material.
4.1.2 All materials used shall be resistant to deteriorati on by the fuel for which the system is designed and to other liquids or compounds with which the material can come in contact as installed under normal operating conditions, e.g. grease, lubricating oil, bilge solvents and sea water
4.2 Copper-based alloys
Copper-based alloys for fittings are acceptable for direct coupling with all tank materials specified in Table 1, except aluminium. Copper-based alloy fittings are allowed for aluminium tanks only if a galvanic barrier is arranged between fitting and tank.

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