constant IP regs, piston vs diaphragm

OceanOpportunity · 21st February 2007, 13:57

Quote: (Originally Posted by AD_ward9)

Have a look at the Design Verification Report on a variable orifice injector in the list HERE. It gives the detailed Matlab model of an orifice, their control, flow curves for different sizes, depths etc. Really, all the meat you should need.

We are having a distributed Denial Of Service attack from SPAMMERs just now, who might be objecting to our SPAM filter, so the site will be slower to respond than usual. Just have patience: it is up and running with a huge bandwidth.

Alex

Hey Alex,

A few of the .pdf's wont open at all and go to dead end web error pages..insight? or perhaps you'd be so kind as to e-mail me the one relating O2 flow..thanks

AD_ward9 · 21st February 2007, 15:08

Quote: (Originally Posted by OceanOpportunity)

Hey Alex,

A few of the .pdf's wont open at all and go to dead end web error pages..insight? or perhaps you'd be so kind as to e-mail me the one relating O2 flow..thanks

I will go and check their permissions right now, so try again in 5 mins.
Please PM me on any that do not open.

Thanks for letting me know.

Found it: I had forgotten to set the permissions when using WinSCP - I use Linux normally where it is quick and easy. Fixed it. My apologies. Please let me know if you have any other problem accessing them whatsoever.

Alex

**fireman** · 21st February 2007, 15:20

Love this debate...I'm still trying to convince the ladies that MY original equipment is the only one that will work in magical and mysterious ways. Accept no substitutes...
I bought two old MK2 on ebay for $15 each and rebuilt them--talk about simple elegance. I couldn't figure out a simply way to fix the ip so I got an apex for the O2 side.
I thought about brazing the holes closed on the MK2, but then I'd still have to put a seal in, and the IP needs shims to adjust, thus the apex.
Will the MK2 flow enough at depth for ssc bail out?

O.C.Diver · 21st February 2007, 15:41

Quote: (Originally Posted by fireman)

Will the MK2 flow enough at depth for ssc bail out?

How Deep? I use a MK2 for my DIL reg on my KC only because of hose routing. The MK2 has plenty of OC flow at 250' IF you have 1,500 psi or more of tank pressure. Somewhere below 1,000 psi the volume flow will start dropping off. If you are going much over 100', I would use a deep diving regulator for my stage bottle. For manual DIL add, ADV, and maybe a few sanity breaths they are fine.

Ted

silent running · 23rd February 2007, 02:18

Quote: (Originally Posted by O.C.Diver)

How Deep? I use a MK2 for my DIL reg on my KC only because of hose routing. The MK2 has plenty of OC flow at 250' IF you have 1,500 psi or more of tank pressure. Somewhere below 1,000 psi the volume flow will start dropping off. If you are going much over 100', I would use a deep diving regulator for my stage bottle. For manual DIL add, ADV, and maybe a few sanity breaths they are fine.

Ted

Hello Ted, for deep dives I use my onboard MK2 dil reg as a manifold, tank valve off with my offboard MK16 with the tmix plumbed through to drive the gas to my ADV/dil add. That way only the diaphram reg is being used deep. You just have to make sure which valve is open/check the spgs-it's simpler than gas blocks or messing with QCs.

So as long as you're carrying OC BO on your deep dives, you will have to have a high quality diaphram 1st stage and can set up a system that bypasses the piston reg for the deep dives this way... -Andy

21st February 2007, 13:57	#51 (permalink)
OceanOpportunity for a world of water Current Rebreather/s: Other CCR Dolphin Home Build Other Rebreather/s: Not Bought Yet Inspiration Classic Other CCR Dolphin Home Build Join Date: Nov 2006 Location: Providence, RI USA Posts: 598	Re: constant IP regs, piston vs diaphragm Quote: (Originally Posted by AD_ward9) Have a look at the Design Verification Report on a variable orifice injector in the list HERE. It gives the detailed Matlab model of an orifice, their control, flow curves for different sizes, depths etc. Really, all the meat you should need. We are having a distributed Denial Of Service attack from SPAMMERs just now, who might be objecting to our SPAM filter, so the site will be slower to respond than usual. Just have patience: it is up and running with a huge bandwidth. Alex Hey Alex, A few of the .pdf's wont open at all and go to dead end web error pages..insight? or perhaps you'd be so kind as to e-mail me the one relating O2 flow..thanks __________________ Michael Lombardi Oceans of Opportunity www.oceanopportunity.com Elected Director, Society for Human Performance in Extreme Environments MN'07, The Explorers Club Project Manager, Diving a Dream
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21st February 2007, 15:08	#52 (permalink)
AD_ward9 RBW Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jun 2005 Location: Scotland Posts: 2,016	Re: constant IP regs, piston vs diaphragm Quote: (Originally Posted by OceanOpportunity) Hey Alex, A few of the .pdf's wont open at all and go to dead end web error pages..insight? or perhaps you'd be so kind as to e-mail me the one relating O2 flow..thanks I will go and check their permissions right now, so try again in 5 mins. Please PM me on any that do not open. Thanks for letting me know. Found it: I had forgotten to set the permissions when using WinSCP - I use Linux normally where it is quick and easy. Fixed it. My apologies. Please let me know if you have any other problem accessing them whatsoever. Alex Last edited by AD_ward9 : 21st February 2007 at 15:49.
(Offline)

21st February 2007, 15:20	#53 (permalink)
fireman rEvo combat swimmer Current Rebreather/s: rEvo Other CCR Other Rebreather/s: rEvo Other CCR Join Date: Nov 2006 Location: chicago Posts: 550	Re: constant IP regs, piston vs diaphragm Love this debate...I'm still trying to convince the ladies that MY original equipment is the only one that will work in magical and mysterious ways. Accept no substitutes... I bought two old MK2 on ebay for $15 each and rebuilt them--talk about simple elegance. I couldn't figure out a simply way to fix the ip so I got an apex for the O2 side. I thought about brazing the holes closed on the MK2, but then I'd still have to put a seal in, and the IP needs shims to adjust, thus the apex. Will the MK2 flow enough at depth for ssc bail out? __________________ Heres to you Capt. Bill Never Forget, and stay safe everyone.
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21st February 2007, 15:41	#54 (permalink)
O.C.Diver Helium Addict Current Rebreather/s: Classic Kiss Other CCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Home Build Join Date: Mar 2006 Location: Salisbury MD USA Summers; Wandering Florida Winters Posts: 244	Re: constant IP regs, piston vs diaphragm Quote: (Originally Posted by fireman) Will the MK2 flow enough at depth for ssc bail out? How Deep? I use a MK2 for my DIL reg on my KC only because of hose routing. The MK2 has plenty of OC flow at 250' IF you have 1,500 psi or more of tank pressure. Somewhere below 1,000 psi the volume flow will start dropping off. If you are going much over 100', I would use a deep diving regulator for my stage bottle. For manual DIL add, ADV, and maybe a few sanity breaths they are fine. Ted __________________ Consider this my opinion.......sometimes I'm even right, but remember.........YMMV. Ted Green Charter Boat "OC Diver" http://www.ocdiver.com
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23rd February 2007, 02:18	#55 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,873	Re: constant IP regs, piston vs diaphragm Quote: (Originally Posted by O.C.Diver) How Deep? I use a MK2 for my DIL reg on my KC only because of hose routing. The MK2 has plenty of OC flow at 250' IF you have 1,500 psi or more of tank pressure. Somewhere below 1,000 psi the volume flow will start dropping off. If you are going much over 100', I would use a deep diving regulator for my stage bottle. For manual DIL add, ADV, and maybe a few sanity breaths they are fine. Ted Hello Ted, for deep dives I use my onboard MK2 dil reg as a manifold, tank valve off with my offboard MK16 with the tmix plumbed through to drive the gas to my ADV/dil add. That way only the diaphram reg is being used deep. You just have to make sure which valve is open/check the spgs-it's simpler than gas blocks or messing with QCs. So as long as you're carrying OC BO on your deep dives, you will have to have a high quality diaphram 1st stage and can set up a system that bypasses the piston reg for the deep dives this way... -Andy
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