Defines gas burning installations in boats, yachts, and other vessels of up to 24 m in length, using liquefied petroleum gas (LPG) from cylinders stowed on board, operating at 28 mbar for commercial butane and 37 mbar for commercial propane. Not applicable on the use of LPG for propulsion of vessels. Covers guidance on selection of materials, design considerations, appliances and components, testing, installation requirements, inspection, and preparing instructions.