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Converting to CNG
Changing cooking fuels is a very extensive project, in that the tanks, the tank locker, the hose, the regulator, and the burner orifices must be changed.
LPG is heavier than air, and lockers are vented BELOW the cylinder (ABYC A-1 - .1.8.4)
CNG is lighter than air, and lockers are vented ABOVE the cylinder (ABYC A-22 -.13.4)
For information on the installation of liquefied petroleum gas (LPG) or compressed natural gas (CNG) systems, galley stoves, and heating systems see NFPA-302 (Fire Protection Standard for Pleasure and Commercial Motor Craft) or American Boat and Yacht Council, Inc. (ABYC) Projects'' A-l, A-3, A-7, and A-22. Also NFPA 54 (National Fuel Gas Code) can provide additional guidance but where this code conflicts with NFPA 302 or ABYC, due to marine constraints, the latter take precedent.