"Dennis Pogson" wrote

Dunno what country you are in, but in the UK, there are regulations which
would virtually FORCE you to use copper tubing along the whole length of
the
run, except at the ends, where a short piece of rubber or armoured rubber
is
permisible because of movement and/or ease of connection.

I find it hard to believe we are alone in this recommendation, sure all
countries with large leisure fleets must have similar regs.?


Dennis,

We are in Canada, but many surveyors use the American ABYC regulations.
These regulations allow use of flexible gas hosing ( I have quoted them
below).

What is not clear to me, is Section 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."

What do they mean by "sleeve and threaded insert" as an end connection on
flexible hose?

GBM


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
environment.
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-1.9.2.1 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).
NOTE to A-1.9.2: The scope of UL 21 states that the
standard is not intended to apply to hose used in confined
areas. A-1.9.2 does not require that the hose be UL listed,
only that it complies with the specified requirements of
the UL standard.
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
flare fittings.
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-1.9.5 Fuel Line Location and Installation
A-1.9.5.1 Fuel supply lines shall be protected from
physical damage, and
A-1.9.5.1.1 shall be accessible for inspection.
A-1.9.5.2 A flexible LPG fuel line section shall be
used to allow free swing of gimbaled stoves.
A-1.9.5.3 Fuel supply lines shall be supported by clips
or straps or other suitable means such as conduit or tray to
prevent vibration damage, and
A-1.9.5.3.1 the clips or straps or other devices shall be
corrosion resistant, and
A-1.9.5.3.2 shall be designed to prevent cutting,
abrading, or damage to the lines, and
A-1.9.5.3.3 shall be galvanically compatible with fuel
supply line material.
A-1.9.5.4 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-1.9.5.5 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-1.9.5.6 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.
A-1.9.5.7 LPG fuel supply lines shall not be used for
an electrical ground.