Low pressure or high pressure Dil / O2 cylinders

denzel · 19th October 2005, 21:38

Well, when you start importing stuff, you'll get quality. That's what's gonna happen.

When we start importing stuff, it'll only get worse.

C'mon, the canadians tossed those silly inches in favour of metric, the poms got rid of their harry potter money and went metric, it's just waiting for you guys to finally to get your arse into gear.

denz.

**rdriver** · 19th October 2005, 22:07

Hi Ron,

I'm With Phi, I would take LP over HP any day I really liked the Faber 19's but they are next to impossible to get anymore (as if I need to tell you!)..... I always get a little apprehensive boosting O2 that High.... I know it's done all the time but it just makes me nervous when I am doing it...... HP tanks are great for dual OC tanks but at least with LP tanks with a descent cascade you can still get almost a complete fill.....and that really helps if you happen to be in a remote location.
Best
Rob

MikeH · 22nd October 2005, 00:28

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

There are approximately 28l(28.3 to be more specific, but we'll use 28 for simplicity) of gas per cubic foot. Therefore, a 3l cylinder at 232 bar(3410psi) will have 696l of gas, or 24.8 cuft. At 2640psi(180 bar), which is what LP steel cylinders are rated for in the US, it contains 540l of gas, or 19.3 cuft.

The Worthington cylinders, based on Deep Thought's posted numbers, are approximately 1.55l(for the 13cuft cylinder) and 2.27l(for the 19cuft cylinder), but are rated for 3442psi(234 bar).

Clear as mud?

Mike

Explorer · 22nd October 2005, 02:41

Quote: (Originally Posted by rdriver)

I would take LP over HP any day I really liked the Faber 19's but they are next to impossible to get anymore (as if I need to tell you!)..... I always get a little apprehensive boosting O2 that High.... I know it's done all the time but it just makes me nervous when I am doing it

Rob,

I have tried a couple sources for the Faber tanks but with no luck in finding some new ones. I was informed that the Worthington cylinders (which are hot dipped galvanized) are the replacement tanks now. The Faber 20 cu. ft. (3 L) comparison tank would be their 19 cu. but that is a pressure of 3130+. If you had the 30 cu. ft. Worthington cylinder, filled to LP, you would have around the 20 cu. ft. volume then. They are also a bit shorter and wider tank.

Any comments?

**rdriver** · 22nd October 2005, 03:24

Quote: (Originally Posted by Explorer)

Rob,

I have tried a couple sources for the Faber tanks but with no luck in finding some new ones. I was informed that the Worthington cylinders (which are hot dipped galvanized) are the replacement tanks now. The Faber 20 cu. ft. (3 L) comparison tank would be their 19 cu. but that is a pressure of 3130+. If you had the 30 cu. ft. Worthington cylinder, filled to LP, you would have around the 20 cu. ft. volume then. They are also a bit shorter and wider tank.

Any comments?

I would have to see what the physical tank similarities are between the two tanks to really judge... but if the Worthington's are about the same size I would say that they would probably work....
Rob

MikeH · 22nd October 2005, 04:01

Quote: (Originally Posted by Explorer)

I have tried a couple sources for the Faber tanks but with no luck in finding some new ones. I was informed that the Worthington cylinders (which are hot dipped galvanized) are the replacement tanks now. The Faber 20 cu. ft. (3 L) comparison tank would be their 19 cu. but that is a pressure of 3130+. If you had the 30 cu. ft. Worthington cylinder, filled to LP, you would have around the 20 cu. ft. volume then. They are also a bit shorter and wider tank.

According to Johns website.....he has some left.... http://www.northeastscubasupply.com/closeouts.html It's worth a phone call to find out.

Mike

Explorer · 22nd October 2005, 05:23

Thanks Mike for the link.

***jradomski*** · 22nd October 2005, 06:45

Quote: (Originally Posted by MikeH)

There are approximately 28l(28.3 to be more specific, but we'll use 28 for simplicity) of gas per cubic foot. Therefore, a 3l cylinder at 232 bar(3410psi) will have 696l of gas, or 24.8 cuft. At 2640psi(180 bar), which is what LP steel cylinders are rated for in the US, it contains 540l of gas, or 19.3 cuft.

The Worthington cylinders, based on Deep Thought's posted numbers, are approximately 1.55l(for the 13cuft cylinder) and 2.27l(for the 19cuft cylinder), but are rated for 3442psi(234 bar).

Clear as mud?

Mike

2232 bar is 3364 psi, you incorrectly used 1 bar=14.7, 1 bar=14.5 psi
the funny thing about the US/dot rated cylinders.. The TC stamp is for 184 bar (2668 psi), but the US DOT is 2400 (with usually no + rating, otherwise it would be the same) so in the US its only legally a 165bar cylinder.

MikeH · 22nd October 2005, 15:13

Quote: (Originally Posted by jradomski)

2232 bar is 3364 psi, you incorrectly used 1 bar=14.7, 1 bar=14.5 psi

There goes all that useless aviation knowledge floating around in my head interfering with my diving math....thanks for the correction.

Mike

apitkin · 23rd October 2005, 21:38

Quote: (Originally Posted by jradomski)

2232 bar is 3364 psi, you incorrectly used 1 bar=14.7, 1 bar=14.5 psi

This is correct. The confusion arises because people get sloppy and equate bars to atmospheres. 1 atmosphere = 14.7 (14.695949) psi = 1.01325 bar.

Ah, that's better.

Just be glad we don't have to use Pascals (or rather megaPascals).

Andy

19th October 2005, 21:38	#11 (permalink)
denzel Holiday diver Current Rebreather/s: Inspiration Classic Other Rebreather/s: Not Bought Yet Join Date: Aug 2005 Location: Perth! Posts: 358	Well, when you start importing stuff, you'll get quality. That's what's gonna happen. When we start importing stuff, it'll only get worse. C'mon, the canadians tossed those silly inches in favour of metric, the poms got rid of their harry potter money and went metric, it's just waiting for you guys to finally to get your arse into gear. denz. __________________ My deepest so far, 558.50 mtr, my rig a LF90D...
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19th October 2005, 22:07	#12 (permalink)
rdriver Supporting Member Current Rebreather/s: Megalodon Other Rebreather/s: Sport Kiss Classic Kiss Join Date: May 2005 Location: Monroe, WI 53566 U.S. Posts: 149	Hi Ron, I'm With Phi, I would take LP over HP any day I really liked the Faber 19's but they are next to impossible to get anymore (as if I need to tell you!)..... I always get a little apprehensive boosting O2 that High.... I know it's done all the time but it just makes me nervous when I am doing it...... HP tanks are great for dual OC tanks but at least with LP tanks with a descent cascade you can still get almost a complete fill.....and that really helps if you happen to be in a remote location. Best Rob
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22nd October 2005, 00:28	#13 (permalink)
MikeH Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2005 Location: Orlando, FL USA Posts: 178	Re: Low pressure or high pressure Dil / O2 cylinders 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 There are approximately 28l(28.3 to be more specific, but we'll use 28 for simplicity) of gas per cubic foot. Therefore, a 3l cylinder at 232 bar(3410psi) will have 696l of gas, or 24.8 cuft. At 2640psi(180 bar), which is what LP steel cylinders are rated for in the US, it contains 540l of gas, or 19.3 cuft. The Worthington cylinders, based on Deep Thought's posted numbers, are approximately 1.55l(for the 13cuft cylinder) and 2.27l(for the 19cuft cylinder), but are rated for 3442psi(234 bar). Clear as mud? Mike
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22nd October 2005, 02:41	#14 (permalink)
Explorer I will teach you a..... Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Alberta, Canada Posts: 763	Re: Low pressure or high pressure Dil / O2 cylinders Quote: (Originally Posted by rdriver) I would take LP over HP any day I really liked the Faber 19's but they are next to impossible to get anymore (as if I need to tell you!)..... I always get a little apprehensive boosting O2 that High.... I know it's done all the time but it just makes me nervous when I am doing it Rob, I have tried a couple sources for the Faber tanks but with no luck in finding some new ones. I was informed that the Worthington cylinders (which are hot dipped galvanized) are the replacement tanks now. The Faber 20 cu. ft. (3 L) comparison tank would be their 19 cu. but that is a pressure of 3130+. If you had the 30 cu. ft. Worthington cylinder, filled to LP, you would have around the 20 cu. ft. volume then. They are also a bit shorter and wider tank. Any comments? __________________ REALLY FRICKIN' TRAIN WRECKED.....
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22nd October 2005, 03:24	#15 (permalink)
rdriver Supporting Member Current Rebreather/s: Megalodon Other Rebreather/s: Sport Kiss Classic Kiss Join Date: May 2005 Location: Monroe, WI 53566 U.S. Posts: 149	Re: Low pressure or high pressure Dil / O2 cylinders Quote: (Originally Posted by Explorer) Rob, I have tried a couple sources for the Faber tanks but with no luck in finding some new ones. I was informed that the Worthington cylinders (which are hot dipped galvanized) are the replacement tanks now. The Faber 20 cu. ft. (3 L) comparison tank would be their 19 cu. but that is a pressure of 3130+. If you had the 30 cu. ft. Worthington cylinder, filled to LP, you would have around the 20 cu. ft. volume then. They are also a bit shorter and wider tank. Any comments? I would have to see what the physical tank similarities are between the two tanks to really judge... but if the Worthington's are about the same size I would say that they would probably work.... Rob
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22nd October 2005, 04:01	#16 (permalink)
MikeH Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2005 Location: Orlando, FL USA Posts: 178	Re: Low pressure or high pressure Dil / O2 cylinders Quote: (Originally Posted by Explorer) I have tried a couple sources for the Faber tanks but with no luck in finding some new ones. I was informed that the Worthington cylinders (which are hot dipped galvanized) are the replacement tanks now. The Faber 20 cu. ft. (3 L) comparison tank would be their 19 cu. but that is a pressure of 3130+. If you had the 30 cu. ft. Worthington cylinder, filled to LP, you would have around the 20 cu. ft. volume then. They are also a bit shorter and wider tank. According to Johns website.....he has some left.... http://www.northeastscubasupply.com/closeouts.html It's worth a phone call to find out. Mike
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22nd October 2005, 05:23	#17 (permalink)
Explorer I will teach you a..... Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Join Date: Sep 2005 Location: Alberta, Canada Posts: 763	Re: Low pressure or high pressure Dil / O2 cylinders Thanks Mike for the link. __________________ REALLY FRICKIN' TRAIN WRECKED.....
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22nd October 2005, 06:45	#18 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 2,898	Re: Low pressure or high pressure Dil / O2 cylinders Quote: (Originally Posted by MikeH) There are approximately 28l(28.3 to be more specific, but we'll use 28 for simplicity) of gas per cubic foot. Therefore, a 3l cylinder at 232 bar(3410psi) will have 696l of gas, or 24.8 cuft. At 2640psi(180 bar), which is what LP steel cylinders are rated for in the US, it contains 540l of gas, or 19.3 cuft. The Worthington cylinders, based on Deep Thought's posted numbers, are approximately 1.55l(for the 13cuft cylinder) and 2.27l(for the 19cuft cylinder), but are rated for 3442psi(234 bar). Clear as mud? Mike 2232 bar is 3364 psi, you incorrectly used 1 bar=14.7, 1 bar=14.5 psi the funny thing about the US/dot rated cylinders.. The TC stamp is for 184 bar (2668 psi), but the US DOT is 2400 (with usually no + rating, otherwise it would be the same) so in the US its only legally a 165bar cylinder. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated. Last edited by jradomski : 22nd October 2005 at 06:49.
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22nd October 2005, 15:13	#19 (permalink)
MikeH Custom Title Allowed! Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Aug 2005 Location: Orlando, FL USA Posts: 178	Re: Low pressure or high pressure Dil / O2 cylinders Quote: (Originally Posted by jradomski) 2232 bar is 3364 psi, you incorrectly used 1 bar=14.7, 1 bar=14.5 psi There goes all that useless aviation knowledge floating around in my head interfering with my diving math....thanks for the correction. Mike
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23rd October 2005, 21:38	#20 (permalink)
apitkin New Member Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Feb 2005 Location: Cloud Cuckoo Land Posts: 100	Re: Low pressure or high pressure Dil / O2 cylinders Quote: (Originally Posted by jradomski) 2232 bar is 3364 psi, you incorrectly used 1 bar=14.7, 1 bar=14.5 psi This is correct. The confusion arises because people get sloppy and equate bars to atmospheres. 1 atmosphere = 14.7 (14.695949) psi = 1.01325 bar. Ah, that's better. Just be glad we don't have to use Pascals (or rather megaPascals). Andy
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