Join Date: Jan 2003
Location: Maine Coast
Thanked 303 Times in 235 Posts
Rep Power: 18
Here's just some of what the ABYC A-1 LPG says:
A-1.9 FUEL LINES
A-1.9.1 As installed, the fuel supply line system and
its components shall be compatible with LPG, and shall
withstand the stresses and exposure of the marine
A-1.9.2 LPG fuel supply line shall comply with the
construction, performance, manufacturing and test, and
marking requirements of UL 21, LP Gas Hose, or
A-126.96.36.199 be corrosion resistant metallic tubing such
as annealed copper tubing, standard type, Grade K or L,
conforming to ASTM B88-75a, Specifications for
Seamless Copper Water Tube, with a wall thickness of not
less than 0.032 inches (0.815 mm).
A-1.9.3 Flexible LPG supply line shall be equipped
with permanently attached end fittings, such as a swaged
sleeve or sleeve and threaded insert.
A-1.9.4 Metal tubing shall be connected by means of
NOTE: “Long nut” flare fittings should be used. The
short nut type fitting used in refrigeration systems can
precipitate fatigue failure due to vibration.
A-188.8.131.52 A flexible LPG fuel line section shall be
used to allow free swing of gimbaled stoves.
A-184.108.40.206 Fuel supply lines shall be protected by close
fitting grommets, sleeves, or sealant of non-abrasive
material wherever they pass through decks or watertight
bulkheads, and the method used shall be watertight.
A-220.127.116.11 Fuel supply lines passing through bulkheads
that need not be watertight shall be installed so that the
bulkheads will not cut, abrade, or damage the line.
A-18.104.22.168 Fuel supply lines shall be continuous lengths
of tubing, piping, or hose from the regulating device,
solenoid valve, or leak detector to the appliance, or to the
flexible section at the appliance.
Considering that I have personally had annealed copper fail, due to fatigue, in my refrigeration system, I personally would NEVER use it on a marine LPG system. I'm amazed that the ABYC still has not made the move to LPG hose... Don't get me wrong properly installed (key word properly) annealed copper is fairly durable but just not for me...
The factory technician for Sea Frost personally did the install on my boat and still I had a tube fail right at the end of the flare nut after only 5 years so I don't trust that "longer" flare nuts will work all that much better. ANY tubing failure on LPG is very, very dangerous luckily for me it was R134 refrigerant and not LPG... I fixed that tube and supported it better and as of yet no issues...
-Maine Sail / CS-36T
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