Duncan's New Add System

jmhardingjr · 24th May 2007, 16:28

Quote: (Originally Posted by dz3866)

Cool Dave, Parts on order. The only thing I changes is (sacrificing old BC hose) is having a QD on the return from the valve to the brass T fitting so I dont have to cut a hose to change or clean the snubber. These part numbers have been put into my homebuilders file.

Ditto. I'm cheap and don't want to sacrifice hoses

.

Tom Rose · 24th May 2007, 17:08

Quote: (Originally Posted by Dave Sutton)

Understood. I'd just run a low IP, add more often shallow, and not worry about the blocked first stage (for now). Set it for 0.5 LPM at surface and see how it works at 30M.

Dave

If you set it to .5 you will be able to go way below 30 meters with a compensated regulator.

If you do the calculation you will find that for depths to 100 feet you will not have to use an uncompensated regulator. I just don't bother. The filter, however, is a necessity. i.e. the flow increase has a linear relationship to the change in inlet absolute (not gauge) pressure according to depth.

abs P2
-------- x Flow at surface = Flow at depth
abs P1

for a worst case example starting interstage pressure of 150 (165 absolute) and rounding atmospheric pressure up to 15 psi

initial measured flow .8

180
----- x .8 = .87
165
flow
absolute pressure at surface 165 .8
absolute pressure at 33 feet 180 .87
absolute pressure at 66 feet 195 .95
absolute pressure at 99 feet 205 .99

Now that I have put my 2cents worth in I would like to thank you for starting me down a new path in making up my own hose lengths. I am now almost free from those issues and starting to rework a couple of systems. That and your clever way of handling the Kiss valve had really cleaned up my Cressi system allowing me to improve the ergonomics.

I did a couple of things you didn't do....added a 50 micron filter (I have had an orifice clog)....nickel plated the fittings, and I use stainless for the orifice and filter(I do not want corrosion to change the orifice)

See the attached picture for the oxygen side of the Aero where I have indicated the positions of the critical orifice, the filter, and the valve...the rest should be obvious to anyone who has been following this thread. I did not mess with the air side yet but those hoses are gonna change to be the exact length I need. Blue hose for air.

Hitting the water this afternoon to check out the feel since I know all those parts work just fine.

Thanks again clever Sea Monkey Dave
Tom

OceanOpportunity · 24th May 2007, 20:24

is anyone using check valves on their O2 side?

narked at 90 · 24th May 2007, 21:10

Quote: (Originally Posted by Duncan Price)

OK - well I need a couple more MJV-2's and two PC-2Y's from Clippard*. Their UK distributor is slow and expensive. Dave Sutton's express delivery service was excellent.

Can remunerate by PayPal or in kind with an excellent new book on the history of UK cave diving ;-).

Pity I can't mail O2, helium or sorb from our chemical store....

* clippard.com only ships to the Our Former Colonies.

hello my old mate if you need clipard stuff as well as loads of other stuff give me a call as i have accounts that might help

hey dave nice mods mate

regards john

Duncan Price · 24th May 2007, 21:52

Quote: (Originally Posted by narked at 90)

hello my old mate if you need clipard stuff as well as loads of other stuff give me a call as i have accounts that might help

hey dave nice mods mate

regards john

John - I'll give you a bell tomorrow - I bet that my employer has an account as well ;-).

All - my system looks just like Tom's except the rubber hoses are yellow rather than green. I am awaiting a 15 µm filter from Swagelok, an isolator ball valve and a QC4 to plumb it into my rig. Will post photos and some performance curves (I've got the pressure guages and flow meter set up to accept it). Its all brass as I dive fresh (well muddy) water.

Dutchy · 25th May 2007, 06:20

Quote: (Originally Posted by SeaBass)

Hey Dave,

Appreciate the classic reminder and great work on the O2 addition module! I for one especially like the way you incorporated the snubber.

Of course this <$50 "Cheap Kiss" Modular Injection System is only half the solution. Redundant PPO2 monitoring is not only more expensive but cannot be ordered through McMaster-Carr.

You wouldn't have a recommendation for something that does both for under $1,500 would you?

-SB

With roughly $1,450 left to spend on displays take a look at the Tecme.de site. (3*single?) or 1*3 and 1*1? (Based on McMunroes design) Or built in OMS cannister as shown in this recent thread.

DanDunfee · 25th May 2007, 13:43

Dave and Tom: My kind of hardware....a nice inexpensive little 'poor mans KISS valve'..... and clean layouts.

I'm starting to look around for the CMF system to ultimately put in my little RGU 2 rig...... I'll do initial trials with the RGU reg, but will ultimately go for a 'pseudo KISS' setup similar to what you've done.

Duncan: Do I remember correctly that one of those little Clippard push valves stuck open on you while inside a wreck.?? If so, what was the corrective action ??

Cheers

Dan

teomannaskali · 25th May 2007, 21:31

If anyone is planning on placing and order soon please PM me. I live ouside the US and would like help gathering the parts and then gettin them in one single package so I dont have to have my money wasted for multiple overseas transports.

I am thinking of connecting directly to regulator (poseidon xstream) or a LP hose. And the ouput will have to be threaded.

Thanks

Teoman

Tom Rose · 26th May 2007, 00:12

Quote: (Originally Posted by Dave Sutton)

So, assuming that you can find a free BC hose,

Dave

Dave you were right about the LDS supply of used hoses...luckily I have a great relationship with a repair facility....today I walked out with a hand full of hoses and started salvaging. Less than 5 minutes a hose and got a 3/8 by barbed end and a bc inflator. I made to dremel cuts on each hose end. See below.

Tom

**Dave Sutton** · 26th May 2007, 01:44

Quote: (Originally Posted by Tom Rose)

Dave you were right about the LDS supply of used hoses...

Glad I can still teach an old dog a few new tricks!

Don't use the 3/8 UNF fittings for a BC hose for breathing supplies, as they are too restrictive. The ones on regulator hoses have quite larger internal bore diameters. They remove the same way as what you just did. LDS's have lpoads of old reg hoses as well.

Dave

24th May 2007, 16:28	#31 (permalink)
jmhardingjr Son of a Sailor Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: Sep 2005 Location: . . . this one particular harbor . . . Posts: 196	Re: Duncan's New Add System Quote: (Originally Posted by dz3866) Cool Dave, Parts on order. The only thing I changes is (sacrificing old BC hose) is having a QD on the return from the valve to the brass T fitting so I dont have to cut a hose to change or clean the snubber. These part numbers have been put into my homebuilders file. Ditto. I'm cheap and don't want to sacrifice hoses . __________________ ". . . the sea's in my veins, my tradition remains, I'm just glad I don't live in a trailer . . ."
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24th May 2007, 20:24	#33 (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: 543	Re: Duncan's New Add System is anyone using check valves on their O2 side? __________________ 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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24th May 2007, 21:10	#34 (permalink)
narked at 90 John Routley Current Rebreather/s: Inspiration Classic Other CCR Dolphin Home Build Other Rebreather/s: Other CCR Dolphin Home Build Join Date: Feb 2005 Location: middlands uk Posts: 1,029	Re: Duncan's New Add System Quote: (Originally Posted by Duncan Price) OK - well I need a couple more MJV-2's and two PC-2Y's from Clippard. Their UK distributor is slow and expensive. Dave Sutton's express delivery service was excellent. Can remunerate by PayPal or in kind with an excellent new book on the history of UK cave diving ;-). Pity I can't mail O2, helium or sorb from our chemical store.... clippard.com only ships to the Our Former Colonies. hello my old mate if you need clipard stuff as well as loads of other stuff give me a call as i have accounts that might help hey dave nice mods mate regards john __________________ CHECK OUT OUR INTERWEBS FOR CUSTOM REBREATHER UPGRADES *WWW.NARKEDAT90.CO.UK* *WWW.GRPSERVICES.COM*
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24th May 2007, 21:52	#35 (permalink)
Duncan Price Sump Monster Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Feb 2005 Location: Wells, Somerset, UK Posts: 335	Re: Duncan's New Add System Quote: (Originally Posted by narked at 90) hello my old mate if you need clipard stuff as well as loads of other stuff give me a call as i have accounts that might help hey dave nice mods mate regards john John - I'll give you a bell tomorrow - I bet that my employer has an account as well ;-). All - my system looks just like Tom's except the rubber hoses are yellow rather than green. I am awaiting a 15 µm filter from Swagelok, an isolator ball valve and a QC4 to plumb it into my rig. Will post photos and some performance curves (I've got the pressure guages and flow meter set up to accept it). Its all brass as I dive fresh (well muddy) water.
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25th May 2007, 06:20	#36 (permalink)
Dutchy Rene Warries Current Rebreather/s: Sport Kiss Other Rebreather/s: Join Date: Apr 2006 Location: Nieuwegein (The Netherlands) Posts: 766	Re: Duncan's New Add System Quote: (Originally Posted by SeaBass) Hey Dave, Appreciate the classic reminder and great work on the O2 addition module! I for one especially like the way you incorporated the snubber. Of course this <$50 "Cheap Kiss" Modular Injection System is only half the solution. Redundant PPO2 monitoring is not only more expensive but cannot be ordered through McMaster-Carr. You wouldn't have a recommendation for something that does both for under $1,500 would you? -SB With roughly $1,450 left to spend on displays take a look at the Tecme.de site. (3single?) or 13 and 1*1? (Based on McMunroes design) Or built in OMS cannister as shown in this recent thread. __________________ = This post is environmentally friendly. It is composed of 100% recycled electrons only. =
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25th May 2007, 13:43	#37 (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: Duncan's New Add System Dave and Tom: My kind of hardware....a nice inexpensive little 'poor mans KISS valve'..... and clean layouts. I'm starting to look around for the CMF system to ultimately put in my little RGU 2 rig...... I'll do initial trials with the RGU reg, but will ultimately go for a 'pseudo KISS' setup similar to what you've done. Duncan: Do I remember correctly that one of those little Clippard push valves stuck open on you while inside a wreck.?? If so, what was the corrective action ?? Cheers Dan __________________ There are 'Bold' divers and old divers, but NO old, ' Bold ' divers
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25th May 2007, 21:31	#38 (permalink)
teomannaskali Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Feb 2006 Location: Istanbul TR Posts: 385	Re: Duncan's New Add System If anyone is planning on placing and order soon please PM me. I live ouside the US and would like help gathering the parts and then gettin them in one single package so I dont have to have my money wasted for multiple overseas transports. I am thinking of connecting directly to regulator (poseidon xstream) or a LP hose. And the ouput will have to be threaded. Thanks Teoman Last edited by teomannaskali : 25th May 2007 at 21:34.
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26th May 2007, 01:44	#40 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,672	Re: Duncan's New Add System Quote: (Originally Posted by Tom Rose) Dave you were right about the LDS supply of used hoses... Glad I can still teach an old dog a few new tricks! Don't use the 3/8 UNF fittings for a BC hose for breathing supplies, as they are too restrictive. The ones on regulator hoses have quite larger internal bore diameters. They remove the same way as what you just did. LDS's have lpoads of old reg hoses as well. Dave __________________ "Changes in Lattitudes, Changes in Attitudes, Nothing remains quite the same".... www.nobubblediving.com
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