LPG - Gas - second tank question

[MANHYPERSS]

i have just fitted a second tank to my GQ, i t-pieced the filler and feed into the previous filler and feed lines, and i isolated the tank solinoids to a switch via the gas safety switch so that i can switch from one tank to the other.

It seems the tanks are balabncing out, i was down to 1/4 of a tank in one tank and had a full tank in th other but today i thought i would just check the second tank and it now has 1/2 and the bigger tank is down ro near 3/4.

In my opionion and knowledge one tank shouldnt be able to pull gas from the other via the filler line as the tanks have a check valve on them.

and the on tank shouldnt be able to pull from the tank that is off through the solinoid.

any ideas???

[vhsle5ltr]

You installed this yourself? Sounds like you are playing with fire, take it to a gas specialist who is licensed. I think you are lucky to have not seriously hurt yourself or someone else!

[MANHYPERSS]

lol, Why is everyone so scared of gas.

I only installed the second tank, a few fittings a couple of t-pieces, stress less, gas is not hard, you just have to be smart, and gas fitter charge an arm and a leg. JEEZE

[daskip]

ive learnt some people are just against gas all together lol

id be taking it to a gas installer for an " inspection " to get it checked out

[MANHYPERSS]

yeah might have to call a mate (that has a mech workshop) and see if he knows a gas fitter that is fair. They wont deal with ya at all.

My mrs is so scared of gas, she hates the idea that i have gas tank under the 4wd (which was fitted when i got it), i would rather drag a gas tank over a rock than drag a petrol tank, gas tanks are strong as hell.

I have a TB42 turbo straight gas setup, so need plenty of gas to get some good bush range.

And fitting gas is safe and easy if done properly.

[the mooch]

i have just fitted a second tank to my GQ, i t-pieced the filler and feed into the previous filler and feed lines, and i isolated the tank solinoids to a switch via the gas safety switch so that i can switch from one tank to the other.

It seems the tanks are balabncing out, i was down to 1/4 of a tank in one tank and had a full tank in th other but today i thought i would just check the second tank and it now has 1/2 and the bigger tank is down ro near 3/4.

In my opionion and knowledge one tank shouldnt be able to pull gas from the other via the filler line as the tanks have a check valve on them.

and the on tank shouldnt be able to pull from the tank that is off through the solinoid.

any ideas???
are you for real?????
take it to a gas specialist before you kill someone other than yourself.:eeeeek:

[IJ.]

LPG solenoids can only seal in one direction, you need to run a hydrostatic valve if you want to be able to isolate each tank.

[MANHYPERSS]

yeah thank IJ, finally got onto a mate that does gas and he told me this, grrr

[White Rider]

LPG isnt compressed all that much, dunno why ppl r scared- most ppl have no problem keeping a cigarette lighter, made of plastic no less, next to their balls all day.

[IJ.]

yeah thank IJ, finally got onto a mate that does gas and he told me this, grrr

A workaround is to fit 2 solenoids to each tank out and have them plumbed facing each other but a Hydrostatic valve is the better alternative and will be legal if your bud signs off on it.

Tank pressure is seldom over 100 Psi these days most failures are down to people NOT understanding the various pipe fittings used and how each one seals, I've seen work from "Qualified fitters" where tapered seat fittings have been glooped or teflon taped......

[MANHYPERSS]

LOL, i pulled apart some of these fitting to reuse and laughed that they had goop on em, they are tapered seat fitting the goop gets no where near where the seal is made, Plus they are Hydraulic type fittings, rated at 1000s PSI.

Gas just scares some people

I did think about running a second solinoid in reverse but thinking that is getting a bit dodgy really and wasnt even game to ask if it would work.

I think i will get a hydro valve, Will i only need one on the feed line?? The filler has a one ways on the tanks so it shouldnt allow balance via filler line will it? ( i really want to run a single filler )

[IJ.]

A Hydrostatic is going to be draining both tanks at the same time, discussed this with a mate last week and my suggestion was an electric ball valve on tank #2 if you're planning to use it as a "reserve".

The T on the Fill's is fine as you're noted they each have their own non return valve in the service assembly.

[MANHYPERSS]

LPG solenoids can only seal in one direction, you need to run a hydrostatic valve if you want to be able to isolate each tank.


now you have lost me, why do you say i need to run a hydrostatic valve if i want to isolate each tank and then


A Hydrostatic is going to be draining both tanks at the same time, discussed this with a mate last week and my suggestion was an electric ball valve on tank #2 if you're planning to use it as a "reserve".

[IJ.]

Sorry had to rethink it all, I screwed the pooch on the first post.

You would still need some sort of switchable valve to be able to isolate each tank, this could be done with 2x electric ball valves or a hydrostatic valve + 1 x electric ball valve or 4x normal Solenoid valves.

[xshore]

LPG isnt compressed all that much, dunno why ppl r scared- most ppl have no problem keeping a cigarette lighter, made of plastic no less, next to their balls all day.

lpg is around 120psig at 21C. At body temp it will be around 200psig.

the butane lighter will be 17 to 31psig depending on ratio of isomers, body temp it will be around 50ish.

LPG is far more dangerous :)

[SS Enforcer]

LPG isnt compressed all that much, dunno why ppl r scared- most ppl have no problem keeping a cigarette lighter, made of plastic no less, next to their balls all day.

Propane is around 1100 kpa, Automix 750 kpa, Butane ( cig Lighter ) 150 kpa.

cheers

[SS Enforcer]

lpg is around 120psig at 21C. At body temp it will be around 200psig.

the butane lighter will be 17 to 31psig depending on ratio of isomers, body temp it will be around 50ish.

LPG is far more dangerous :)

Beat me to it ... the pressure I see is after loading road tankers at around 30* I have seen propane hit 1600 kpa in a tanker.

cheers

[FORCEFEDGAS]

if you want to isolate the tanks safely you need to fit 2 fillers, other wise if you just run off 1 tank all the time when you fill up it keeps filling gas into the other tank which will overfill it passed its 80% mark, then when it expands when warms up...... it can rupture the tank, And has done and its not pretty. And the hyrdostatic valve a safety requirement and legal. for the same reason as above, allows the line to vent if the pressure gets to high.

Safety first

regards

[SS Enforcer]

if you want to isolate the tanks safely you need to fit 2 fillers, other wise if you just run off 1 tank all the time when you fill up it keeps filling gas into the other tank which will overfill it passed its 80% mark, then when it expands when warms up...... it can rupture the tank, And has done and its not pretty. And the hyrdostatic valve a safety requirement and legal. for the same reason as above, allows the line to vent if the pressure gets to high.

Safety first

regards

Your right except that you can fill to 85% well thats what we fill tankers and above ground tanks to. As for the single fill I figured the same and think that if the OP leaves the setup like it is and has both tanks equalising it should balance out ok. Having said that when filling multiple tanks through a common fill point we always have to switch one off to prevent overfilling as one will always fill at a faster rate even when the tanks are level.

cheers