Which booster

Ben Field · 13th March 2007, 14:32

Quote: (Originally Posted by jptaylor9)

I was quite impressed by the Divetech Ltd booster shown at LIDS 2007 (but I'm not an enginner so what do I know

).

See DTB5C on: Gas booster - Trimix - Diving.

Anyone got or used on of these?

FWIW- I dropped them a mail, its £1350 (with connecting whips)

kiwidiver · 13th March 2007, 19:01

dtb5c this booster on the spec sheet indicates that it only has a boost ratio of 10:1.To me this seems rather low with most ordinary boosters running 25 or 30:1.Is It me or have I missed something here.

**UWSojourner** · 13th March 2007, 19:15

Quote: (Originally Posted by robinfante)

be forewarned the HI is a work in progress. They have been fooling around with a new piston design for about 6 months now. I sent my unit back to the factory last August after about 4 hours of use, with massive piston bypass. So far I'm up to 9 promises that the redesign is complete and my unit will be done "in a week."

I've heard that same story from a diver in Portland. He's pretty frustrated.

robinfante · 13th March 2007, 19:35

I'm up to 12 promises now, still no sign of it...

jptaylor9 · 13th March 2007, 20:09

Quote: (Originally Posted by kiwidiver)

dtb5c this booster on the spec sheet indicates that it only has a boost ratio of 10:1.To me this seems rather low with most ordinary boosters running 25 or 30:1.Is It me or have I missed something here.

It'll boost to 250bar, isn't that enough?

200bar is enough for most Rebreather's...

kiwidiver · 14th March 2007, 05:03

at 10:1 I do not think it would make a very effective scavenger when supply pressures are low.Therefore taking along time or not able to achieve the magical 200 bar.

decoweenie · 14th March 2007, 05:07

Quote: (Originally Posted by kiwidiver)

at 10:1 I do not think it would make a very effective scavenger when supply pressures are low.Therefore taking along time or not able to achieve the magical 200 bar.

I agree.

However, O2 is very cheap (i.e. US$15 for medical J, for me) and unless you are out in the wood, it is not important to return the J bottles 1/4 full (i.e. 50 bar).

If it is Helium, then I pump it thru the compressor.

Personally, my booster is only used to boost the pressure from the decanting pressure to ~200 bar - enough for about 3 dives and spare.

aknelson · 19th March 2007, 19:54

Quote: (Originally Posted by kiwidiver)

at 10:1 I do not think it would make a very effective scavenger when supply pressures are low.Therefore taking along time or not able to achieve the magical 200 bar.

10:1 means you need 20Bar to drive 200bar.

Remember you need some reserve too. A 23:1 allows to boost with less than 10 Bar 200bar. The pressure for most scuba is around 10Bar so a Booster with 23:1 will work off a stage in the field.

DSC04157r.jpg
Andreas

decoweenie · 19th March 2007, 20:06

Quote: (Originally Posted by aknelson)

The pressure for most scuba is around 10Bar so a Booster with 23:1 will work off a stage in the field.

In theory, but I could honestly tell you in practice it doesn't work out quite as such... And we are using the same booster...

I have spent all day trying to boost (unsuccesfully) from below 50bar. So now, I just throw the remaining O2 away when got under a certain pressure.

It would cost me more on electricity, filter and wear-and-tear on my compressor to provide enough drive gas to save $5. Not counting my time...

colinicky · 19th March 2007, 20:19

I have been using mine for over a year now filling O2 for ccr & also twin 12's with mix upto 40% & it has scavanged as low as 5 bar in the supply J .I only ever run it from a 15L scuba cylinder as the drive gas .Would love to find a sensibly priced compressor that would run it instead but still looking

13th March 2007, 14:32	#11 (permalink)
Ben Field CK+Shearwater Current Rebreather/s: Classic Kiss Other Rebreather/s: Sport Kiss Join Date: Aug 2005 Location: London, England Posts: 1,824	Re: Which booster Quote: (Originally Posted by jptaylor9) I was quite impressed by the Divetech Ltd booster shown at LIDS 2007 (but I'm not an enginner so what do I know ). See DTB5C on: Gas booster - Trimix - Diving. Anyone got or used on of these? FWIW- I dropped them a mail, its £1350 (with connecting whips) __________________ Know your PPO2, Pre-breath, Use checklists, Validate cells at 6mtrs, Use pure O2 at or near surface, Use a BOV, Don't dive Solo, Change Slime and Cells as recommended by Manufacturer, don't listen to Puppeteers and RTFM! Last edited by Ben Field : 14th March 2007 at 10:09. Reason: New info
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13th March 2007, 19:01	#12 (permalink)
kiwidiver RBW Member Current Rebreather/s: Inspiration Classic Inspiration Vision Azimuth Home Build Other Rebreather/s: Azimuth Home Build Join Date: Jul 2005 Location: new zealand Posts: 161	Re: Which booster dtb5c this booster on the spec sheet indicates that it only has a boost ratio of 10:1.To me this seems rather low with most ordinary boosters running 25 or 30:1.Is It me or have I missed something here.
(Online)

13th March 2007, 19:15	#13 (permalink)
UWSojourner Pacific Northwest Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Feb 2005 Location: Portland Oregon Posts: 563	Re: Which booster Quote: (Originally Posted by robinfante) be forewarned the HI is a work in progress. They have been fooling around with a new piston design for about 6 months now. I sent my unit back to the factory last August after about 4 hours of use, with massive piston bypass. So far I'm up to 9 promises that the redesign is complete and my unit will be done "in a week." I've heard that same story from a diver in Portland. He's pretty frustrated.
(Online)

13th March 2007, 19:35	#14 (permalink)
robinfante I have a smoking gun Current Rebreather/s: Megalodon Prism Topaz MK 15.X Other Rebreather/s: Sport Kiss Join Date: Nov 2005 Location: mountain lakes nj Posts: 159	Re: Which booster I'm up to 12 promises now, still no sign of it...
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13th March 2007, 20:09	#15 (permalink)
jptaylor9 Sentinel Current Rebreather/s: Other Rebreather/s: Inspiration Classic Inspiration Vision Join Date: Feb 2005 Location: London, UK Posts: 321	Re: Which booster Quote: (Originally Posted by kiwidiver) dtb5c this booster on the spec sheet indicates that it only has a boost ratio of 10:1.To me this seems rather low with most ordinary boosters running 25 or 30:1.Is It me or have I missed something here. It'll boost to 250bar, isn't that enough? 200bar is enough for most Rebreather's... Last edited by jptaylor9 : 13th March 2007 at 20:27.
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14th March 2007, 05:03	#16 (permalink)
kiwidiver RBW Member Current Rebreather/s: Inspiration Classic Inspiration Vision Azimuth Home Build Other Rebreather/s: Azimuth Home Build Join Date: Jul 2005 Location: new zealand Posts: 161	Re: Which booster at 10:1 I do not think it would make a very effective scavenger when supply pressures are low.Therefore taking along time or not able to achieve the magical 200 bar.
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14th March 2007, 05:07	#17 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,488	Re: Which booster Quote: (Originally Posted by kiwidiver) at 10:1 I do not think it would make a very effective scavenger when supply pressures are low.Therefore taking along time or not able to achieve the magical 200 bar. I agree. However, O2 is very cheap (i.e. US$15 for medical J, for me) and unless you are out in the wood, it is not important to return the J bottles 1/4 full (i.e. 50 bar). If it is Helium, then I pump it thru the compressor. Personally, my booster is only used to boost the pressure from the decanting pressure to ~200 bar - enough for about 3 dives and spare. __________________ "...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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19th March 2007, 20:06	#19 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,488	Re: Which booster Quote: (Originally Posted by aknelson) The pressure for most scuba is around 10Bar so a Booster with 23:1 will work off a stage in the field. In theory, but I could honestly tell you in practice it doesn't work out quite as such... And we are using the same booster... I have spent all day trying to boost (unsuccesfully) from below 50bar. So now, I just throw the remaining O2 away when got under a certain pressure. It would cost me more on electricity, filter and wear-and-tear on my compressor to provide enough drive gas to save $5. Not counting my time... __________________ "...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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19th March 2007, 20:19	#20 (permalink)
colinicky RBW Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Join Date: Mar 2005 Location: uk Posts: 684	Jetsam baby booster I have been using mine for over a year now filling O2 for ccr & also twin 12's with mix upto 40% & it has scavanged as low as 5 bar in the supply J .I only ever run it from a 15L scuba cylinder as the drive gas .Would love to find a sensibly priced compressor that would run it instead but still looking __________________ Colin I trust my rebreather completely , I just don't trust the user onwards & downwards
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