Boat Safety Scheme - Standard 7.21 to 7.22

7.21.1 Appliance Isolation valve (Not immediately adjacent to appliance and appliance served not indicated).
It is important that users should be able to identify instantly which appliance an isolation valves controls. If the valve is not close enough to the appliance to make it immediately obvious, there must be some kind of marking or label on or near the isolation valve indicating which appliance it controls.

7.21.2 Appliance Isolation valve (Valves operated by rotation not closed clockwise rotation)
If valves operate by rotation, closing shall be clockwise.

7.21.3 Appliance Isolation valve (Open and closed positions not clearly marked on or adjacent to valve)
Open and Closed positions shall be clearly marked on or adjacent to all valves.

7.21.4 Appliance Isolation valve (Tapered plug valve not spring loaded)
Tapered plug valves, the traditional gas tap, are spring loaded for use with LPG to ensure the tightest possible seal between the plug and the valve body. Apart from the spring assembly they are identical to those used for Natural Gas. The spring assembly can be clearly seen above the nut at the base of the valve.

7.21.5 Appliance Isolation valve (Needle valve installed)
Needle valves are not suitable as they cannot be guaranteed to provide a LPG tight seal and the internal workings may obstruct the flow of LPG.

7.21.6 Appliance Isolation valve (Floor level valves not located to prevent inadvertent operation and not drop fan or loose key type)
Valves at floor level shall be located to prevent inadvertent operation, particularly if they are sited in walkways, or shall be drop fan or loose key type.

7.21.7 Appliance permanently removed (Supply pipework not properly plugged or capped)
Pipework to appliances permanently removed or removed for servicing shall be properly plugged or capped. Isolation valves alone should not be used for this purpose.
Where appliances have been permanently removed, the acceptable practice is to remove the supply pipework back as far as practicable and at least as far as the branch tee joint, which should be plugged or capped, at the main supply. In these circumstances the redundant joint will not be regarded as an unnecessary joint.

7.22.1 Means to determine soundness (Not Fitted)
Suitable means of testing for gas soundness must be fitted in the system. There are three acceptable options: A readily accessible test point fitted to the appliance, A readily accessible test point fitted in the pipework or a bubble tester installed in the cylinder locker box.

7.22.2 Soundness of LPG installation (Leak in system)
That is no acceptable level of LPG leakage. When tested there should be no discernible leak.