Help with Fittings - IDA-71

Mossyback · 4th June 2007, 19:44

Hi Folks,

Thanks to everyone who posted helpful suggestions, I've solved my harness problem and ordered one that will suit my needs. I've also ordered a "P" zipper and glue for my CL. And to add to my spending spree

I've got a McMaster-Carr needle valve being shipped to replace the crappy one that I've got on my filling whip.

Wishing to continue my string of good luck, I need help on replacing hoses etc. on my IDA-71. Here's my problem - if in fact it is a problem. The various thread sizes seem to match ones that I can purchase locally. The problem is the funny ends on the fittings. To build the filling whip, I had the shop cut the end off the Russian curly filling whip and put it on the end of my filling whip.

Most of the Russian fittings for hoses etc. have ends that are slightly concave. What holds the pressure? Is it metal to metal contact or the threads? If it is the threads then will teflon tape on them make a seal?

I've taken some pic to show the ends that I'm talking about. Many of you have added hoses to your modifications so I know that it can be done. I just don't know the proper procedure.

Help!
Hank

**Dave Sutton** · 5th June 2007, 02:58

Most of the seals are metal to metal.

When you end up really converting the rig, you'll just cut the tubes and use metric tube to SAE fittings and can then use standard hardware.

Dave

montyg · 5th June 2007, 06:15

Hi

I'm not sure about the HP side and fill whips for your IDA-71. Generally we don't fiddle with that side of a rig.

What I can tell you is that there are many ways to attach the medium pressure hoses to the rig.

We ended up cutting the tubes from feeding the O2 into the exhale t-piece, and the line to the ADV.

Then we got some brass compression fittings (an imperial size which is a tad smaller than 8mm) from tube to 1/4 NPT male. Screw another 1/4 NPT female to 1/4 inch barb fitting to that male and push on the flexible hose from your O2 or diluent regulator.

I got fed up with permanently fixed plumbing very quickly, and had a BC quick-connect silver soldered to the 1/4 NPT male end, so now it's plug-and-play-ala-Dave :-D

Thanks Dave, that was a great tip!

rgds
monty

Corallaro · 5th June 2007, 10:44

Hi

for my IDA-71 i reuse all its pieces in different combination
i cut the rigid clamp of hose connectors of external unit that i don't use to take the connector.

and i make compound hoses 3/8 unf - russian (reused)
i have in my town a vendor that can make rigid clamp for hoses for scuba

so i solve all connections

only to fill the IDA tank i make an adapter from din e/o oxygen to ida

and only in this case use a teflon ring

Giovanni

jaap · 5th June 2007, 14:49

Hi

The one in the lower right corner (LP-hose) is sealed via the radial o-ring that can be seen, much like the seal on the hose connection that goes into a normal scuba second stage.

The lower left one (HP-fitting right?) has a face typ gasket. At least on the filling ports I have that look like that (but they also have a non return valve).

The upper left one is for the gauge right? I think the cupper gasket that can be seen makes the seal.

The upper right one I'm unsure of but it might be a conical metal to metal seal.

Mossyback · 11th June 2007, 21:58

Hi Guys,

I've been away for a few days so I'm a little tardy in replying.

Thanks to Dave, Monty, Giovanni and JAAP for your replies.

It's all becoming a little clearer now. I've gone back and re-read Dave's conversion and I think I'll remove the Nitrox plug-in, cut the two tubes and use the fittings and stuff as Dave suggests and shown in Monty's post. I like the quick disconnect concept.

Giovanni, I'm not sure if I understand you. Were you able to re-use the Russian fittings and put them on new hoses?

I now know how to replace the LP hoses as Dave has indicated in his posts. I think I'll build the KISS manual add device from Dave's recent post since I'm taking it all apart anyway.

On the HP side there's still the problem of the weird fitting on the end of the SPG. I'd like to replace that hose. If I can re-use the fittings on both ends then the problem would be solved.

Hank

Corallaro · 12th June 2007, 07:15

Yes Hank, but only in LP system not in HP...
the only mod that i make in HP line is replace T piece of external 1.3 litres tank (that i place instead of the original internal 1 liter) with the T piece of original internal tank with your gauge and hp hose so to have an internal 1,3 litres diluent tank

Giovanni

Mossyback · 12th June 2007, 17:28

Quote: (Originally Posted by Corallaro)

Yes Hank, but only in LP system not in HP...
the only mod that i make in HP line is replace T piece of external 1.3 litres tank (that i place instead of the original internal 1 liter) with the T piece of original internal tank with your gauge and hp hose so to have an internal 1,3 litres diluent tank

Giovanni

Hi Giovanni,

O.K. Now I understand. I'll stick to the LP system for now.

Hank

Corallaro · 12th June 2007, 18:23

see my mods of diluent line
a little solded homemade manifold with two outs, one for manual diluent valve and other for wings/autoair
Giovanni

Mossyback · 13th June 2007, 12:52

Quote: (Originally Posted by Corallaro)

see my mods of diluent line
a little solded homemade manifold with two outs, one for manual diluent valve and other for wings/autoair
Giovanni

The photos are a great help. Thanks, Giovanni.

5th June 2007, 02:58	#2 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Evolution Megalodon rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,907	Re: Help with Fittings - IDA-71 Most of the seals are metal to metal. When you end up really converting the rig, you'll just cut the tubes and use metric tube to SAE fittings and can then use standard hardware. Dave __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com
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5th June 2007, 14:49	#5 (permalink)
jaap Normal people worry me Current Rebreather/s: Classic Kiss Other CCR RB80 / Clone Ray Other SCR Home Build Other Rebreather/s: Other CCR RB80 / Clone Ray Other SCR Home Build Join Date: Jun 2005 Location: Stockholm Sweden Posts: 473	Re: Help with Fittings - IDA-71 Hi The one in the lower right corner (LP-hose) is sealed via the radial o-ring that can be seen, much like the seal on the hose connection that goes into a normal scuba second stage. The lower left one (HP-fitting right?) has a face typ gasket. At least on the filling ports I have that look like that (but they also have a non return valve). The upper left one is for the gauge right? I think the cupper gasket that can be seen makes the seal. The upper right one I'm unsure of but it might be a conical metal to metal seal. __________________ My initials: JAAP
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11th June 2007, 21:58	#6 (permalink)
Mossyback Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Mar 2007 Location: Southern Ontario, Canada Posts: 109	Re: Help with Fittings - IDA-71 Hi Guys, I've been away for a few days so I'm a little tardy in replying. Thanks to Dave, Monty, Giovanni and JAAP for your replies. It's all becoming a little clearer now. I've gone back and re-read Dave's conversion and I think I'll remove the Nitrox plug-in, cut the two tubes and use the fittings and stuff as Dave suggests and shown in Monty's post. I like the quick disconnect concept. Giovanni, I'm not sure if I understand you. Were you able to re-use the Russian fittings and put them on new hoses? I now know how to replace the LP hoses as Dave has indicated in his posts. I think I'll build the KISS manual add device from Dave's recent post since I'm taking it all apart anyway. On the HP side there's still the problem of the weird fitting on the end of the SPG. I'd like to replace that hose. If I can re-use the fittings on both ends then the problem would be solved. Hank __________________ "Be the kind of person your dog thinks you are."
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12th June 2007, 07:15	#7 (permalink)
Corallaro IDA-71,IDA-76,NaubosAR90 Current Rebreather/s: Other CCR Other Rebreather/s: Not Bought Yet Other CCR Join Date: Oct 2006 Location: Italia - Sicilia Posts: 248	Re: Help with Fittings - IDA-71 Yes Hank, but only in LP system not in HP... the only mod that i make in HP line is replace T piece of external 1.3 litres tank (that i place instead of the original internal 1 liter) with the T piece of original internal tank with your gauge and hp hose so to have an internal 1,3 litres diluent tank Giovanni
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12th June 2007, 17:28	#8 (permalink)
Mossyback Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Mar 2007 Location: Southern Ontario, Canada Posts: 109	Re: Help with Fittings - IDA-71 Quote: (Originally Posted by Corallaro) Yes Hank, but only in LP system not in HP... the only mod that i make in HP line is replace T piece of external 1.3 litres tank (that i place instead of the original internal 1 liter) with the T piece of original internal tank with your gauge and hp hose so to have an internal 1,3 litres diluent tank Giovanni Hi Giovanni, O.K. Now I understand. I'll stick to the LP system for now. Hank __________________ "Be the kind of person your dog thinks you are."
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13th June 2007, 12:52	#10 (permalink)
Mossyback Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Mar 2007 Location: Southern Ontario, Canada Posts: 109	Re: Help with Fittings - IDA-71 Quote: (Originally Posted by Corallaro) see my mods of diluent line a little solded homemade manifold with two outs, one for manual diluent valve and other for wings/autoair Giovanni The photos are a great help. Thanks, Giovanni. __________________ "Be the kind of person your dog thinks you are."
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