Low pressure or high pressure Dil / O2 cylinders

Deep Thought · 18th October 2005, 15:38

Worthington has produced a new line of galvanized steel cylinders with a pressure rating of 3130 + in sizes of 13 cu. ft. , 19 cu. ft. respective weights 10 lbs. and 12 lbs.

I have previously used both the Faber 2 ltr. and the 3 ltr. 232 bar, and the 13 cu. ft. and 19 cu. ft. 2400+ cylinders. I have weighed the cylinders on a postal scale and the weight is very very close, although the material is a different steel. I find the buoyancy characteristics to be ideal with the Faber cylinders diving primarily in fresh water.

My question to the Rebreather group is two parts:

1. would you choose high pressure or low pressure if the cylinder size/weight were the same?

2. if you need weight to offset the buoyancy of your insulation or rig, would you choose heavier tanks or add lead ballast?

ron

decoweenie · 18th October 2005, 15:51

Quote: (Originally Posted by Deep Thought)

1. would you choose high pressure or low pressure if the cylinder size/weight were the same?

Could I have low pressure tank for the O2 and high pressure tank for the diluent ?

Low pressure.

Quote:

2. if you need weight to offset the buoyancy of your insulation or rig, would you choose heavier tanks or add lead ballast?

I would use lead since I might change my insulation or rig depending on the dive location. Removing lead is easier than changing to different set of tanks.

Explorer · 18th October 2005, 16:29

Another question to ask Rebreather divers out there.

OMS is phasing out their LP 2400 psi Faber steel tanks for the HP's.

Do Rebreather divers use the LP 2400 psi Faber 20 cu. ft. tanks for O2/Dil cylinders?

***schford*** · 18th October 2005, 16:34

I get confused with American sizing - so how do new cylinders compare in gas volume stored to 3l 232 bar steels - which I use.

Stuart

Explorer · 18th October 2005, 16:40

3l = 20 cu. ft. ish
232 bar = 3300 psi ish

The 'ish' factor.

decoweenie · 18th October 2005, 16:49

Quote: (Originally Posted by schford)

I get confused with American sizing - so how do new cylinders compare in gas volume stored to 3l 232 bar steels - which I use.

For G*d sake, it is your Imperial system to start with.

At least we are consistent with the unit instead of miles/hr on the highway, liter for liquid measurement except for beer (pint), stones for weight, meters for depth, feet for land...

(232 bar) x (3L) = 696 free L
696 free L / 28.3 = 24.6 cf @ 3300 psi

Deep Thought · 18th October 2005, 16:53

I would be nice to have a standard unit such as the UK; like my travels last year to Plymouth I recall getting off a train and asking a taxi driver how many kilometers it was to town and he promptly confused me with miles? Further complicating maters was renting a car and driving on the wrong side of the road...

Anyone can chime in with the proper math anytime now, but the rough equivalent when comparing the Faber 2 liter 232 bar cylinders is 13 cu. ft at 2640 psi, and the 3 liter 232 bar cylinder is 19 cu. ft at 2640.

I much prefer the measurement of volume x pressure bar, but have to work with what we are given in the states till things change. As I recall it was in my 3rd or 4th grade of primary school that our country was switching to the metric system.

ron

Quote: (Originally Posted by schford)

I get confused with American sizing - so how do new cylinders compare in gas volume stored to 3l 232 bar steels - which I use.

Stuart

Explorer · 18th October 2005, 16:54

See, that is the American side I get confused with also.

Canadians just go with the flow with whatever works.

***caveseeker7*** · 18th October 2005, 17:52

Quote: (Originally Posted by decoweenie)

At least we are consistent ...

You mean like using a 210 mm lens on 4 x 5 camera?

decoweenie · 18th October 2005, 19:16

Quote: (Originally Posted by caveseeker7)

You mean like using a 210 mm lens on 4 x 5 camera?

See what happened when we start importing things from Japan and Europe ?

18th October 2005, 15:38	#1 (permalink)
Deep Thought Custom Title Allowed! Current Rebreather/s: Inspiration Vision Classic Kiss Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Megalodon Sport Kiss Classic Kiss Optima Join Date: Apr 2005 Location: Great Lakes Posts: 190	Low pressure or high pressure Dil / O2 cylinders Worthington has produced a new line of galvanized steel cylinders with a pressure rating of 3130 + in sizes of 13 cu. ft. , 19 cu. ft. respective weights 10 lbs. and 12 lbs. I have previously used both the Faber 2 ltr. and the 3 ltr. 232 bar, and the 13 cu. ft. and 19 cu. ft. 2400+ cylinders. I have weighed the cylinders on a postal scale and the weight is very very close, although the material is a different steel. I find the buoyancy characteristics to be ideal with the Faber cylinders diving primarily in fresh water. My question to the Rebreather group is two parts: 1. would you choose high pressure or low pressure if the cylinder size/weight were the same? 2. if you need weight to offset the buoyancy of your insulation or rig, would you choose heavier tanks or add lead ballast? ron
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18th October 2005, 15:51	#2 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Quote: (Originally Posted by Deep Thought) 1. would you choose high pressure or low pressure if the cylinder size/weight were the same? Could I have low pressure tank for the O2 and high pressure tank for the diluent ? Low pressure. Quote: 2. if you need weight to offset the buoyancy of your insulation or rig, would you choose heavier tanks or add lead ballast? I would use lead since I might change my insulation or rig depending on the dive location. Removing lead is easier than changing to different set of tanks. __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM
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18th October 2005, 16:29	#3 (permalink)
Explorer I will teach you a..... Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Alberta, Canada Posts: 754	Another question to ask Rebreather divers out there. OMS is phasing out their LP 2400 psi Faber steel tanks for the HP's. Do Rebreather divers use the LP 2400 psi Faber 20 cu. ft. tanks for O2/Dil cylinders? __________________ TRAIN WRECKED.....
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18th October 2005, 16:34	#4 (permalink)
*schford* Despotic Overlord Current Rebreather/s: Megalodon Sport Kiss Other Rebreather/s: Join Date: Jan 2005 Location: London, UK Posts: 3,662	I get confused with American sizing - so how do new cylinders compare in gas volume stored to 3l 232 bar steels - which I use. Stuart
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18th October 2005, 16:40	#5 (permalink)
Explorer I will teach you a..... Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Alberta, Canada Posts: 754	3l = 20 cu. ft. ish 232 bar = 3300 psi ish The 'ish' factor. __________________ TRAIN WRECKED.....
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18th October 2005, 16:49	#6 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Quote: (Originally Posted by schford) I get confused with American sizing - so how do new cylinders compare in gas volume stored to 3l 232 bar steels - which I use. For Gd sake, it is your Imperial system to start with. At least we are consistent with the unit instead of miles/hr on the highway, liter for liquid measurement except for beer (pint), stones for weight, meters for depth, feet for land... (232 bar) x (3L) = 696 free L 696 free L / 28.3 = 24.6 cf @ 3300 psi __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM*
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18th October 2005, 16:53	#7 (permalink)
Deep Thought Custom Title Allowed! Current Rebreather/s: Inspiration Vision Classic Kiss Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Megalodon Sport Kiss Classic Kiss Optima Join Date: Apr 2005 Location: Great Lakes Posts: 190	I would be nice to have a standard unit such as the UK; like my travels last year to Plymouth I recall getting off a train and asking a taxi driver how many kilometers it was to town and he promptly confused me with miles? Further complicating maters was renting a car and driving on the wrong side of the road... Anyone can chime in with the proper math anytime now, but the rough equivalent when comparing the Faber 2 liter 232 bar cylinders is 13 cu. ft at 2640 psi, and the 3 liter 232 bar cylinder is 19 cu. ft at 2640. I much prefer the measurement of volume x pressure bar, but have to work with what we are given in the states till things change. As I recall it was in my 3rd or 4th grade of primary school that our country was switching to the metric system. ron Quote: (Originally Posted by schford) I get confused with American sizing - so how do new cylinders compare in gas volume stored to 3l 232 bar steels - which I use. Stuart
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18th October 2005, 16:54	#8 (permalink)
Explorer I will teach you a..... Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Alberta, Canada Posts: 754	See, that is the American side I get confused with also. Canadians just go with the flow with whatever works. __________________ TRAIN WRECKED.....
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18th October 2005, 17:52	#9 (permalink)
*caveseeker7* Who loves ya, baby Current Rebreather/s: Sport Kiss Other Rebreather/s: Prism Topaz Join Date: Jan 2005 Location: Too far from Neverland Posts: 5,325	Quote: (Originally Posted by decoweenie) At least we are consistent ... You mean like using a 210 mm lens on 4 x 5 camera? __________________ Cheers Stefan "It is still a good day if you are on the green side of the grass! Su amigo Roberto!" Sponsor Lou in Race For Life!
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18th October 2005, 19:16	#10 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,510	Quote: (Originally Posted by caveseeker7) You mean like using a 210 mm lens on 4 x 5 camera? See what happened when we start importing things from Japan and Europe ? __________________ "...after a while you get bored offering advice to a bull that like to keep butting the fence with its head rather than walking through the open gate..." - Rebreather World PM
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