Installation pipework must be fixed away from, or insulated against, electricity or
telecommunication services and must not pass through the same duct as these
other systems. It must be separated from uncovered electrical cables by at least
30mm (1.2ins). It's also recommended that installation pipework does not pass
through ventilation or air conditioning ducts located on your boat.

Deterioration of pipework could occur if it's subjected to water damage. To
reduce the chance of this happening it's a good idea to keep pipework away
from water services.

The effect of heat on pipework can cause it to expand and contract, which can
lead to a hardening of the pipework or loose joints, which in turn could allow gas to
escape. To help prevent this happening, installation pipework must be positioned at
least 75mm (3ins) away from exhaust pipes or other sources of heat. [7.18]