Forum Home
PC World Chat
 
Thread ID: 142875 2016-09-29 23:59:00 LPG Gas Bottle Calculations Roscoe (6288) PC World Chat
Post ID Timestamp Content User
1426629 2016-09-29 23:59:00 I have two lpg gas bottles, one for the motorhome and one for the bbq. The bottle for the motorhome is 19kg and the one for the bbq is about half that size but I don't know the weight - I can only guess.

It is easy to calculate how much gas is left in the 19kg bottle as I can weigh the bottle and work that out. For example:

EW – empty weight, includes valve 8.35kg
Full weight 19kg
Today’s weight 12.8kg
Minus EW 8.35
4.45 kg of gas
When full 19kg
EW 8.35
Weight of gas when full 10.65 - ½ = 5.32
So with the above figures the bottle is just under half full.

Obviously I can use the same calculation to work out how much gas is left in the bbq bottle, but I do not know the empty or full weight of the bbq bottle. Hopefully someone can help me out with those figures. Thank you. 		Roscoe (6288)
1426630 2016-09-30 00:16:00 The weights should be stamped on the handle/valve-guard.
they vary
my two 9kg bottles are:
TW 7.57 EW 8.42
TW 8.75 EW 9.26

so some difference there. 		KarameaDave (15222)
1426631 2016-09-30 00:59:00 Thank you for that. I did not know to look there.

My bottle is not the same as yours.

TW 5.25
EW 5.75

What does TW stand for?

Does that mean that my bottle is a 9kg as well?

I still don't know what the full weight is. Are you able to help me there? 		Roscoe (6288)
1426632 2016-09-30 01:05:00 Thank you for that. I did not know to look there.

My bottle is not the same as yours.

TW 5.25
EW 5.75

What does TW stand for?

Does that mean that my bottle is a 9kg as well?

I still don't know what the full weight is. Are you able to help me there?

TW = Tare weight (meaning the empty weight)


Last paragraph on this page
www.elgas.co.nz 		Morgenmuffel (187)
1426633 2016-09-30 01:16:00 or you could invest in one of these

www.stevens.co.nz

I assume it works on the temperature of the liquid gas vs the gassy gas (very technical term that) 		Morgenmuffel (187)
1426634 2016-09-30 01:28:00 Well the old fashioned way was to pour boiling water over the bottle and a condensation line would appear where the bottle was filled to.

You can actually feel the difference in temperature where the hot steel meets the cold steel. 		B.M. (505)
1426635 2016-09-30 02:12:00 We only have one bottle in our camper van so we can't swap to a backup bottle if we run out. Given that our cooking and heating are both gas, the consequences of running out of gas during the winter or away from a gas refilling station are unpleasant. I initially tried one of those stick on cards but they don't play nicely with our bottle size/design.

I therefore invested in a $45 Truma device that detects the gas level when pressed up against the bottle and switched on (sort of like a stud finder...). I have found it good for my peace of mind when away from civilisation. 		John H (8)
1426636 2016-09-30 03:15:00 You could have bought a spare bottle for that, and then you really would have security of supply. I have 5 bottles for 3 applications, the kitchen hob, the barbie and a heater. All are kept full when not in use, so all that is ever involved is a bottle change. I don't need to know how much gas is in any part-used bottle. Richard (739)
1426637 2016-09-30 03:17:00 You could have bought a spare bottle for that, and then you really would have security of supply. (snip)

Ohhh, really clever; why didn't I think of that??? And where do you suggest I could have kept the extra bottle. For goodness sake... 		John H (8)
1426638 2016-09-30 03:31:00 Ohhh, really clever; why didn't I think of that??? And where do you suggest I could have kept the extra bottle. For goodness sake...

You could transfer the gas too. I saw a transfer hose for gas bottles on eBay. Includes adapters. Image here (www.aussiebbq.info) from Aussie BBQ forum. 		kahawai chaser (3545)
1 2