Thread: Interesting LPG regulation

The deal is one red Diamond per tank as fire fighters need to know how many over pressure relief valves are fitted per vehicle.
When your 4bys with a gas tank catches on fire the tanks will vent to stop a explosion, but that venting can shoot a flame out from the vehicle 4 mtrs or more.
The fire fighters also need to know how many tanks are fitted to spray water on them to keep them cool enough to keep the safety valves working.
Flexible hose is OK so long it is the correct type of hose and is mechanically fasten to the vehicle the correct way and is protected correctly from mechanical damage and heat etc.
The statement above is correct about twin tanks and one over filling with use.
My under standing twin tanks operating separately is OK so long as a independent filler is used for each tank.
Many old International V8 petrol/LPG trucks used to have one tank on each side of the chassis rail with separate AFL valves and fillers.
A series Landrover will take a forklift bottle under body a long the chassis rail each side OK this way. ( fork bottle must be a AFL type)
A Manifold tank is classed is one tank as only one set of AFL , Ullage , excess flow valves . etc are used.
The gas system these days is fitted with lock off valves at the gas tank and and one at the gas converter and these valve will only open when two requirements are met.......... engine turning and ignition on.
Any break in a gas line will trigger the excess flow valve to operate and slow the gas flow to a trickle and this is one of the things which are checked / tested yearly with your rego inspection and is why access is needed to the gas tank valve compartment.
To the untrained eye many of the gas regs don't not make sense.
They are fair and for a reason.
The tank fitted in your 4 by is not a barbeque bottle....... it has many more safety features than that ,like......... double valves , one set of soft rubber which do the day to day gas tight sealing and another set of high temp heat resistant valves for a fire.
The rubber valves usually packit in after ten years and this why your tank must be replaced or tested and rebuilt with new valves after ten years.

Originally Posted by r.over

I think that you will find that this only applies if your tank and converter are also attached to the chassis. A body is usually rubber mounted to the chassis. Therefore there can be movement between the chassis and the body. You must use a flexible gas line wherever movement can occur. So wherever the pipe goes from the body to chassis or back again you must have a section of flexible hose.

Or a simple coil/loop in the copper pipe to allow for movement