Boat Safety Scheme - Standard 7.5 to 7.6

7.5.1 Cylinder locker / housing drains (Material of drain pipes, hose and connections not suitable for use with LPG)
The drain pipe should be made of a material suitable for use with LPG. It should have no joints or connections apart from at the locker and the hull fitting. The pipe can be made of metal. Flexible hose should ideally be made to BS3212, other suitable hoses include EPDM and hoses suitable for use with petroleum products. Hose made from natural rubber and many plastics are not suitable as LPG attacks them.

7.5.2 Cylinder locker / housing drains (Drain hoses connections not in accordance with standard 7.13)
A flexible drain pipe should be connected at either end using suitable connections and be free from corrosion or damage. Hose clamps should be of the prescribed type with a band width of at least 8mm.

7.5.3 Cylinder locker / housing drains (Not at least 19mm internal diameter)
Drains should have an internal diameter of at least 19mm throughout its whole length. For Lockers which have storage exceeding 38kg the drain diameter should enlarged proportionally for the addition capacity. As a guide 47kg = 20mm, 94kg = 30mm.

7.5.4 Exemption Applied (11.22)
Vessels manufactured prior to 3 January 2000 and having an LPG drain with a minimum
internal diameter of 12mm for a cylinder of up to 15kg capacity and which is enlarged
proportionally for additional LPG storage, are not required to comply with that part of
Standard 7.5 which requires the drain to have an internal diameter of at least 19mm.

7.6.1 Cylinder locker / housing opening (Does not enable specified functions)
The opening into the cylinder locker should enable the operation of valves, replacement of cylinders and access to connections or regulators. It should allow these functions to be performed with a full complement of cylinders in the locker.

7.6.2 Cylinder locker opening (Situated in accommodation/engine/fuel/ or battery space)
The cylinder locker opening needs to be separated from accommodation spaces to reduce to risk to the crew of the vessel, to provide emergency services with an awareness of the likely position of the cylinders in the event of an incident. Openings into engine / fuel or battery spaces are potential sources of heat and electrical sparks which may ignite escaping LPG.

7.6.3 Exemption Applied (11.23)
Vessels manufactured prior to 3 January 2000 that were designed and constructed with a cylinder locker within the hull of the vessel, but outside engine, fuel or battery spaces, are not required to comply with that part of Standard 7.6 which requires that the opening into a cylinder locker shall not be sited in an accommodation space provided the cylinder locker is located in a low risk position.