Max IP for DS4 ??

DanDunfee · 1st July 2007, 21:39

Based on first-hand knowlege or experience, whats the max IP that a DS4 can normally be cranked up to. ??

Also, does anyone have hard, raw, data that characterizes the 'IP Linearity' ( IP vs Tank Pressure) of a DS4 ??... obviously at the same DS4 IP preload point, and all data taken in the same test sequence ?

divetheworld · 1st July 2007, 22:13

Quote: (Originally Posted by DanDunfee)

Based on first-hand knowlege or experience, whats the max IP that a DS4 can normally be cranked up to. ??

Also, does anyone have hard, raw, data that characterizes the 'IP Linearity' ( IP vs Tank Pressure) of a DS4 ??... obviously at the same DS4 IP preload point, and all data taken in the same test sequence ?

Yes, different examples ranged from 11.7 to 12.4bar at ambient.

No, would be interesting in respect to IP/flow rate charting.

DanDunfee · 1st July 2007, 22:25

Clarification..... My stated interest was in IP Linearity....not flow rate.

By IP Linearity, I meant the variation of IP at the same (fixed) set point, as the tank pressure changes.... Said another way =
Difference in delivered IP (creep) as tank pressure decreases (eg from 3,000 down to...say 250 PSI). The best or cleanest data would be under no-flow conditions....but where any trapped IP was vented off before starting each new test point.

cys · 1st July 2007, 23:03

Quote: (Originally Posted by DanDunfee)

Based on first-hand knowlege or experience, whats the max IP that a DS4 can normally be cranked up to. ??

I have run 13.4 bar with a DS4.

decoweenie · 2nd July 2007, 03:59

Quote: (Originally Posted by cys)

I have run 13.4 bar with a DS4.

With the standard spring from Apeks ?

Years ago when it was checked with Apeks, they have mentioned that the max possible IP is around 12.5+ bar when the spring will become solid from compression.

I have never managed to have it higher than 12.5-12.7 bar myself on several DS4 regs, so am pretty sure that tolerance is tight.

Have you checked it against another IP gauge just in case the first gauge is off ?

cys · 2nd July 2007, 04:32

There is somone on the KISS list I contacted off-list who achieved 13.5 bar, so I was expecting to get there and just used one of my ip gauges to measure the value. It would be interesting to know how many people have actually tried to go beyond 12.5... Maybe there's first stage to first stage variability

The flow rate with the new style KISS valve was 1.05 lpm at 13.4 bar and given the old paper KISS manual suggests 13 bar should give .90 lpm, it all seemed at least consistent. Anyway by swapping the spring 20 bar is supposed to be possible.

Quote: (Originally Posted by decoweenie)

With the standard spring from Apeks ?

Years ago when it was checked with Apeks, they have mentioned that the max possible IP is around 12.5+ bar when the spring will become solid from compression.

I have never managed to have it higher than 12.5-12.7 bar myself on several DS4 regs, so am pretty sure that tolerance is tight.

Have you checked it against another IP gauge just in case the first gauge is off ?

decoweenie · 2nd July 2007, 06:09

May be Apeks changed their spring, who knows...

1.05 lpm is a little high for deco though, IMHO.

Ben Field · 2nd July 2007, 08:36

I have idly speculated what we'd need to do to get a new spring made up to our requirements....

cys · 2nd July 2007, 09:08

The spring that is supposed to be good to 20 bar is commercial.

Quote: (Originally Posted by Ben Field)

I have idly speculated what we'd need to do to get a new spring made up to our requirements....

**RichClark** · 2nd July 2007, 09:12

Quote: (Originally Posted by cys)

The spring that is supposed to be good to 20 bar is commercial.

So who knows where to source the replacemnt springs?

Cheers

1st July 2007, 21:39	#1 (permalink)
DanDunfee Custom Title Allowed! Current Rebreather/s: Other CCR Other SCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Other SCR Home Build Join Date: Sep 2005 Location: Virginia, USA Posts: 204	Max IP for DS4 ?? Based on first-hand knowlege or experience, whats the max IP that a DS4 can normally be cranked up to. ?? Also, does anyone have hard, raw, data that characterizes the 'IP Linearity' ( IP vs Tank Pressure) of a DS4 ??... obviously at the same DS4 IP preload point, and all data taken in the same test sequence ? __________________ There are 'Bold' divers and old divers, but NO old, ' Bold ' divers Last edited by DanDunfee : 1st July 2007 at 21:57.
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1st July 2007, 22:13	#2 (permalink)
divetheworld Dive porn pimp Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Classic Kiss Other CCR Join Date: Mar 2005 Location: Leeds, England Posts: 1,636	Re: Max IP for DS4 ?? Quote: (Originally Posted by DanDunfee) Based on first-hand knowlege or experience, whats the max IP that a DS4 can normally be cranked up to. ?? Also, does anyone have hard, raw, data that characterizes the 'IP Linearity' ( IP vs Tank Pressure) of a DS4 ??... obviously at the same DS4 IP preload point, and all data taken in the same test sequence ? Yes, different examples ranged from 11.7 to 12.4bar at ambient. No, would be interesting in respect to IP/flow rate charting. __________________ Attitude and self praise is no reccomendation. Dont try to be a great man, just be a man and let history be the judge of you. *WWW.NARKEDAT90.CO.UK* *http://www.grpservices.com/pursuit/* Supporting Shearwater Research Products in Europe
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1st July 2007, 22:25	#3 (permalink)
DanDunfee Custom Title Allowed! Current Rebreather/s: Other CCR Other SCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Other SCR Home Build Join Date: Sep 2005 Location: Virginia, USA Posts: 204	Re: Max IP for DS4 ?? Clarification..... My stated interest was in IP Linearity....not flow rate. By IP Linearity, I meant the variation of IP at the same (fixed) set point, as the tank pressure changes.... Said another way = Difference in delivered IP (creep) as tank pressure decreases (eg from 3,000 down to...say 250 PSI). The best or cleanest data would be under no-flow conditions....but where any trapped IP was vented off before starting each new test point. __________________ There are 'Bold' divers and old divers, but NO old, ' Bold ' divers Last edited by DanDunfee : 2nd July 2007 at 12:17.
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1st July 2007, 23:03	#4 (permalink)
cys Customise Me! Current Rebreather/s: Classic Kiss MK 15.X Other Rebreather/s: Join Date: Feb 2005 Location: S. California Posts: 210	Re: Max IP for DS4 ?? Quote: (Originally Posted by DanDunfee) Based on first-hand knowlege or experience, whats the max IP that a DS4 can normally be cranked up to. ?? I have run 13.4 bar with a DS4.
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2nd July 2007, 03:59	#5 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Re: Max IP for DS4 ?? Quote: (Originally Posted by cys) I have run 13.4 bar with a DS4. With the standard spring from Apeks ? Years ago when it was checked with Apeks, they have mentioned that the max possible IP is around 12.5+ bar when the spring will become solid from compression. I have never managed to have it higher than 12.5-12.7 bar myself on several DS4 regs, so am pretty sure that tolerance is tight. Have you checked it against another IP gauge just in case the first gauge is off ? __________________ "...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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2nd July 2007, 04:32	#6 (permalink)
cys Customise Me! Current Rebreather/s: Classic Kiss MK 15.X Other Rebreather/s: Join Date: Feb 2005 Location: S. California Posts: 210	Re: Max IP for DS4 ?? There is somone on the KISS list I contacted off-list who achieved 13.5 bar, so I was expecting to get there and just used one of my ip gauges to measure the value. It would be interesting to know how many people have actually tried to go beyond 12.5... Maybe there's first stage to first stage variability The flow rate with the new style KISS valve was 1.05 lpm at 13.4 bar and given the old paper KISS manual suggests 13 bar should give .90 lpm, it all seemed at least consistent. Anyway by swapping the spring 20 bar is supposed to be possible. Quote: (Originally Posted by decoweenie) With the standard spring from Apeks ? Years ago when it was checked with Apeks, they have mentioned that the max possible IP is around 12.5+ bar when the spring will become solid from compression. I have never managed to have it higher than 12.5-12.7 bar myself on several DS4 regs, so am pretty sure that tolerance is tight. Have you checked it against another IP gauge just in case the first gauge is off ?
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2nd July 2007, 06:09	#7 (permalink)
decoweenie Crash Test Dummy Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Feb 2005 Location: Cairo Posts: 5,487	Re: Max IP for DS4 ?? May be Apeks changed their spring, who knows... 1.05 lpm is a little high for deco though, IMHO. __________________ "...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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2nd July 2007, 08:36	#8 (permalink)
Ben Field CK+Shearwater Current Rebreather/s: Classic Kiss Other Rebreather/s: Sport Kiss Join Date: Aug 2005 Location: London, England Posts: 1,775	Re: Max IP for DS4 ?? I have idly speculated what we'd need to do to get a new spring made up to our requirements.... __________________ 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 and RTFM! Beware Fridge Suck! www.hugsac.org.uk
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2nd July 2007, 09:08	#9 (permalink)
cys Customise Me! Current Rebreather/s: Classic Kiss MK 15.X Other Rebreather/s: Join Date: Feb 2005 Location: S. California Posts: 210	Re: Max IP for DS4 ?? The spring that is supposed to be good to 20 bar is commercial. Quote: (Originally Posted by Ben Field) I have idly speculated what we'd need to do to get a new spring made up to our requirements....
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2nd July 2007, 09:12	#10 (permalink)
RichClark Classic KISS No. 226 Current Rebreather/s: Classic Kiss Other Rebreather/s: Join Date: Mar 2005 Location: Hove, UK Posts: 793	Re: Max IP for DS4 ?? Quote: (Originally Posted by cys) The spring that is supposed to be good to 20 bar is commercial. So who knows where to source the replacemnt springs? Cheers __________________ The more I learn about women, the more I want to go diving... just don't tell my wife I said that To taste something a little different, try http://www.thechillikitchen.co.uk
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