when swapping gas bottles you can get either a 9kg -8.5kg and now a 7.85kg. When I queried I was told they were all filled by weight and were all the same, I think they only fill all bottles to a max of 80% so 80%of a 9kg is in my book more than 80% of 7.85kg . My question is if they are all the same are they under filling 9kg's or over filling 7.85's ?
oldbobsbus said
08:17 PM May 12, 2014
Stl wrote:
when swapping gas bottles you can get either a 9kg -8.5kg and now a 7.85kg. When I queried I was told they were all filled by weight and were all the same, I think they only fill all bottles to a max of 80% so 80%of a 9kg is in my book more than 80% of 7.85kg . My question is if they are all the same are they under filling 9kg's or over filling 7.85's ?
If you look at a gas cylinder it will have the Water Capacity WC stamped on the collar
On a 9kg cyl it will be around 10.5kg (water and gas in liquid form weigh near the same)
if you also check the Tare Weight TW or Tare it shows the empty weight of the cyl..
If you then weigh the FULL cyl and subtract the TW you will know how much gas you are getting for your money..
You can also weigh a part used cylinder and work out how much gas you have left..
Our laws that protect consumers from retailers selling us less than we pay for have prompted their suppliers to drop the stated weight of the contents of gas cylinders when infact they still may be selling you 9kg's of gas.
landy said
11:30 PM May 12, 2014
Thanks Bob good answer Landy
Stl said
06:25 AM May 13, 2014
Thank you Bob so on a 9kg bottle marked with a WC of 10.5 kg and if filled to 80% you should only get 8.4 kg As I don't have a 8.5 or a 7.85 I cant check the WC kgs on them but when I can I will .
Ps Bob that fridge of mine, it turned out to be both thermostat and cooling unit. Anyway some of us still have to go to work :(
oldbobsbus said
06:51 AM May 13, 2014
The above info goes for ALL cylinders from the smallest Primus pencil cylinder to the biggest gas cylinder you see sitting in a paddock or the tankers that deliver the bulk gas.
When filling gas cylinders operator error can come into the equation when cylinders are filled by weight (pumped in under pressure on scales) :-
Lets say the TW of a cylinder to be filled is 10.5 plus 9.00 of gas = 19.5kg so that what he should set the scales at so the mechanism trips off when it is filled to the correct level..
BUT
if the last cylinder he filled had a TW of say 11.00 and he is too lazy to adjust the scales then you would only get 8.5kg of gas..
oldbobsbus said
07:44 AM May 13, 2014
Looks like I was a bit out on my guess on WC of a 9kg cylinder..
I have just looked at a couple I have and their WC is around 21-22kgs
but anyway I hope you get the drift of what gas cylinders and filling by weight is about..
Dougwe said
09:10 AM May 13, 2014
Hi Bob,
Just a query and I might have missed it above but if a cylinder is filled using the bleeder valve system is it still only filling to 80% ??
Edit....Sorry, I only ask as I always seem to get longer out of a cylinder filled the bleeder system way than a swap and go. Much cheaper too.
-- Edited by Dougwe on Tuesday 13th of May 2014 09:12:26 AM
oldbobsbus said
09:40 AM May 13, 2014
Dougwe wrote:
Hi Bob,
Just a query and I might have missed it above but if a cylinder is filled using the bleeder valve system is it still only filling to 80% ??
Edit....Sorry, I only ask as I always seem to get longer out of a cylinder filled the bleeder system way than a swap and go. Much cheaper too.
-- Edited by Dougwe on Tuesday 13th of May 2014 09:12:26 AM
Hi Doug,
The dip tube that goes down into the cylinder and is part of the bleeder should goto the 80% level and as such only fill to 80%
BUT
some cylinders are different shapes and heights so there is a chance that some cylinders could fill over the 80% mark to say 82% then you would get extra out of them.
Also as I explained above some fillers are lazy and dont bother to adjust the scales between cylinders.. They just set it at an average weight and some get extra and some get short changed..
I think thats why the Exchange resellers are now saying they are selling 8.5kgs of gas instead of 9.00kgs to cover their backsides if someone were to take them to task..
I have a couple of Full exchange cylinder here and I will weigh them and report back soon..
oldbobsbus said
09:54 AM May 13, 2014
Well just goes to show maybe my old bathroom scales are a bit out but this is the results of the 2 cylinders I have here.
Cylinder 1.
Full weight = 16.2k
TW = 7.98
Gas = 8.22
Cylinder 2
Full weight = 16.25
TW = 7.95
Gas = 8.30kgs
I might add that my scales are old and may not be accurate but it looks like I was short changed as it is labeled 8.5kg..
dorian said
10:40 AM May 13, 2014
oldbobsbus wrote:
I might add that my scales are old and may not be accurate ...
Of course you could weigh an empty cylinder and check the measured weight against that which is stamped or recorded on it, but I wonder if there is a simple way to calibrate bathroom scales with items of known weight that are commonly found around the house.
BTW, I use coins to calibrate kitchen scales, as these have a precise, reproducible weight.
oldbobsbus said
03:53 PM May 13, 2014
dorian wrote:
oldbobsbus wrote:
I might add that my scales are old and may not be accurate ...
Of course you could weigh an empty cylinder and check the measured weight against that which is stamped or recorded on it, but I wonder if there is a simple way to calibrate bathroom scales with items of known weight that are commonly found around the house.
BTW, I use coins to calibrate kitchen scales, as these have a precise, reproducible weight.
Hi Dorian,
I do still have my certified scales from the days when we used to fill cylinders by weight but I figured for the exercise it wasn't worth getting them out and servicing them etc. just to do a small experiment..
when swapping gas bottles you can get either a 9kg -8.5kg and now a 7.85kg. When I queried I was told they were all filled by weight and were all the same, I think they only fill all bottles to a max of 80% so 80%of a 9kg is in my book more than 80% of 7.85kg . My question is if they are all the same are they under filling 9kg's or over filling 7.85's ?
If you look at a gas cylinder it will have the Water Capacity WC stamped on the collar
On a 9kg cyl it will be around 10.5kg (water and gas in liquid form weigh near the same)
if you also check the Tare Weight TW or Tare it shows the empty weight of the cyl..
If you then weigh the FULL cyl and subtract the TW you will know how much gas you are getting for your money..
You can also weigh a part used cylinder and work out how much gas you have left..
Our laws that protect consumers from retailers selling us less than we pay for have prompted their suppliers to drop the stated weight of the contents of gas cylinders when infact they still may be selling you 9kg's of gas.
Landy
Ps Bob that fridge of mine, it turned out to be both thermostat and cooling unit. Anyway some of us still have to go to work :(
The above info goes for ALL cylinders from the smallest Primus pencil cylinder to the biggest gas cylinder you see sitting in a paddock or the tankers that deliver the bulk gas.
When filling gas cylinders operator error can come into the equation when cylinders are filled by weight (pumped in under pressure on scales) :-
Lets say the TW of a cylinder to be filled is 10.5 plus 9.00 of gas = 19.5kg so that what he should set the scales at so the mechanism trips off when it is filled to the correct level..
BUT
if the last cylinder he filled had a TW of say 11.00 and he is too lazy to adjust the scales then you would only get 8.5kg of gas..
Looks like I was a bit out on my guess on WC of a 9kg cylinder..
I have just looked at a couple I have and their WC is around 21-22kgs
but anyway I hope you get the drift of what gas cylinders and filling by weight is about..
Hi Bob,
Just a query and I might have missed it above but if a cylinder is filled using the bleeder valve system is it still only filling to 80% ??
Edit....Sorry, I only ask as I always seem to get longer out of a cylinder filled the bleeder system way than a swap and go. Much cheaper too.
-- Edited by Dougwe on Tuesday 13th of May 2014 09:12:26 AM
Hi Doug,
The dip tube that goes down into the cylinder and is part of the bleeder should goto the 80% level and as such only fill to 80%
BUT
some cylinders are different shapes and heights so there is a chance that some cylinders could fill over the 80% mark to say 82% then you would get extra out of them.
Also as I explained above some fillers are lazy and dont bother to adjust the scales between cylinders..
They just set it at an average weight and some get extra and some get short changed..
I think thats why the Exchange resellers are now saying they are selling 8.5kgs of gas instead of 9.00kgs to cover their backsides if someone were to take them to task..
I have a couple of Full exchange cylinder here and I will weigh them and report back soon..
Well just goes to show maybe my old bathroom scales are a bit out but this is the results of the 2 cylinders I have here.
Cylinder 1.
Full weight = 16.2k
TW = 7.98
Gas = 8.22
Cylinder 2
Full weight = 16.25
TW = 7.95
Gas = 8.30kgs
I might add that my scales are old and may not be accurate but it looks like I was short changed as it is labeled 8.5kg..
Of course you could weigh an empty cylinder and check the measured weight against that which is stamped or recorded on it, but I wonder if there is a simple way to calibrate bathroom scales with items of known weight that are commonly found around the house.
BTW, I use coins to calibrate kitchen scales, as these have a precise, reproducible weight.
Hi Dorian,
I do still have my certified scales from the days when we used to fill cylinders by weight but I figured for the exercise it wasn't worth getting them out and servicing them etc. just to do a small experiment..