Paragraph 5
The fuel tank shall be substantially constructed, securely fixed in position with a metal tray underneath and fitted with suitable filling, vapour venting and relief arrangements. No part of the tank or its connections nor any part of the fuel piping or fittings shall depend on soft solder for tightness, and tanks made of steel shall be protected externally against corrosion by sea water by metal spraying or similar means. The tanks and its connections shall be capable of withstanding hydraulic pressure corresponding to a head of at least 4·5 metres. A cock shall be fitted at each end of the fuel pipe.