New LPG user with question about volume.

[Bramidan]

I have just filled my new Gas it system.
I have two 6 kg cylinders. I worked out that if 1Kg = 1.96 litres at 80% to fill I would be looking at 12 @ 1.96 = 23.52.
23.52 @ 80% = 18.81 litres say 19 litres.
Went to Asda my nearest LPG supplier and with a great deal of trepidation ( first time!) filled it up. I just held the button down thinking it would stop at 19 litres approx.
It actually stopped at 24.37 litres.
When I got home I checked the hob had gas supply and checked the fridge fired up on gas, all ok.
I have to confess I am a worrier! Do you think it is because it is cold or is there another reason why it didn’t cut off at 80%?
Thanks in advance.

 

[poppycamper]

I think, probably wrongly that on refillable bottles the size quoted is Including the 80%...
Differant on underslung tanks where you do have to allow for 80%
Sure someone be along soon to clarify.

 

[DJL220]

On my Gaslow system for 2x6kg then the 80% fill is 24l. Not sure if the Gasit system is similar.

Go on the Gasit website or call them to check and put your mind at rest

 

[Stealaway]

Its a common problem.
I've found its the different machines and suppliers pressure as to when they cut off.
I have a Safefill bottle that cuts off perfectly but the other one is a bit more variable.
I watch it and stop when I think its a 80% - I only fill them when they are empty.
I've never had a problem and I'm sure I would notice any liquid gas was getting to the hob.

 

[Lenny HB]

I think, probably wrongly that on refillable bottles the size quoted is Including the 80%...
Differant on underslung tanks where you do have to allow for 80%
Sure someone be along soon to clarify.

Yep that's right, all bottles the capacity is given to the 80% level, with tanks it's to the 100% level.

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[BillyKontiki]

The cylinders that you have actually hold 6 kg of liquid gas at 80% full, so each tank holds
Approximately 12 litres of lpg,so your not far off at 24 litres.

 

[Bramidan]

Right thanks all, once again I over complicated the issue!
I can now relax.
As an aside I really appreciate this site which enables novices, like me, to get expert advice.

 

[DuxDeluxe]

Yep that's right, all bottles the capacity is given to the 80% level, with tanks it's to the 100% level.

Spot on. My 70 litre underslung tank maxes out at about 56litres

 

[Lenny HB]

Spot on. My 70 litre underslung tank maxes out at about 56litres

They quote tanks as the 100% capacity but fit an 80% cut off valve, where as bottles they quote at the 80% limit, daft isn't it.

 

[funflair]

They quote tanks as the 100% capacity but fit an 80% cut off valve, where as bottles they quote at the 80% limit, daft isn't it.

I’m guessing that tanks could be used for liquid takeoff so don’t need 80% for vapour, that is just a guess though

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[DuxDeluxe]

I’m guessing that tanks could be used for liquid takeoff so don’t need 80% for vapour, that is just a guess though

For safety reasons there must always be an ullage space in a liquid tank, so even with liquid take off there will still be that space

 

[Basildog]

I’m guessing that tanks could be used for liquid takeoff so don’t need 80% for vapour, that is just a guess though

Even liquid take off tanks need room for expansion

 

[DuxDeluxe]

Even liquid take off tanks need room for expansion

At sea we had a fill limit of 98% for all tanks even though the product was fully refrigerated at -43°C (propane) - each tank held about 6000 tonnes

 

[Basildog]

At sea we had a fill limit of 98% for all tanks even though the product was fully refrigerated at -43°C (propane) - each tank held about 6000 tonnes

The refrigeration would be the reason
That’s a fair amount

 

[DuxDeluxe]

The refrigeration would be the reason
That’s a fair amount

A lot to do with tank size and shape - plus economics and the fact that the reliquifaction compressors run 24/7 and very closely monitored to keep pressure between 0.05 and 0.22 bar, the safety limits

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[Basildog]

A lot to do with tank size and shape - plus economics and the fact that the reliquifaction compressors run 24/7 and very closely monitored to keep pressure between 0.05 and 0.22 bar, the safety limits

Reliquification is surprisingly actually quite common on Leisure vehicles when the experts install LPG tanks or cylinders at larger distances than recommended for the high pressure regulator hose