HELP NEEDED: IDA71 Hose diameter

GKAM · 30th January 2008, 19:55

Hi all,

I am 2.000km away from my IDA71 but I need to know the internal hose diameter so I can get a male P-port adaptor made. Can any IDA71 (or IDA59, IDA64 etc) owner please measure the internal diameter of the hose?

Your help would be much appreciated. Green awaits.

Thanks,
George

bythesea · 30th January 2008, 23:33

Quote: (Originally Posted by GKAM)

Hi all,

I am 2.000km away from my IDA71 but I need to know the internal hose diameter so I can get a male P-port adaptor made. Can any IDA71 (or IDA59, IDA64 etc) owner please measure the internal diameter of the hose?

Your help would be much appreciated. Green awaits.

Thanks,
George

I only have a 76 available so I can't measure the scrubber end of the hoses . At the DSV end the tube fitting the hose fits over has a smallest diameter of 1.05" and largest of 1.065"(it is slightly tapered). There is a bead at the end of the fitting to help secure the clamped hose measuring 1.085". Anyway 1.065" would probably do it assuming both ends of a 71 hose are identical.

kiwi_diver · 30th January 2008, 23:43

From original metalic soviet DSV as used on IDA-64 and AKA-60: 25mm.

GKAM · 31st January 2008, 00:10

Quote: (Originally Posted by bythesea)

I only have a 76 available so I can't measure the scrubber end of the hoses . At the DSV end the tube fitting the hose fits over has a smallest diameter of 1.05" and largest of 1.065"(it is slightly tapered). There is a bead at the end of the fitting to help secure the clamped hose measuring 1.085". Anyway 1.065" would probably do it assuming both ends of a 71 hose are identical.

OK, thanks very much !

AFAIK all the popular Soviet Rebreather rigs use the same hoses and DSV connectors except the large IDA72.

So just to confirm: The smallest internal diameter of the hose you mesured is 1.05" (i.e. 26.7mm)?

I put together a collage to show the measurement I am looking for (minus the Russian fitting). I am trying to convert the original hose to accept a male P-port connector. Depending on the internal diameter, I will go for delrin/ertalon/pvc or brass. I would like to avoid the use of a lathe for the brass option and get the part direct from Martin at TecMe...

(Thanks Martin and Dave, sorry for "borrowing" your photos

)

/GKAM

bythesea · 31st January 2008, 00:49

Quote: (Originally Posted by GKAM)

OK, thanks very much !

AFAIK all the popular Soviet Rebreather rigs use the same hoses and DSV connectors except the large IDA72.

So just to confirm: The smallest internal diameter of the hose you mesured is 1.05" (i.e. 26.7mm)?

Could not get accurate measurement of the hose with a micrometer so I measured the OD of the fitting it goes on. The smallest ID of the hose should be 1.05" so thats the ID of your fitting. When you make the p-port fitting you would want to leave a bead 1.085" at the end to help secure the hose. I checked the ID of that fitting as well and it's roughly 25mm so that probably where we get different numbers.

kiwi_diver · 31st January 2008, 01:13

Can I make a suggestion, that you ditch the original hoses and go for a larger bore loop where possible? I found the WOB a bit heavy with standard hoses. I know that there are fittings in the loop that are still only 25mm but at least they are smooth bore. The issue with the hoses is that the ribbing in them is effectively a bunch of baffles and it increases the WOB. If you fit larger bore hoses to the original fittings, you at least reduce the baffle effect. Worked for me.

GKAM · 31st January 2008, 05:03

Quote: (Originally Posted by kiwi_diver)

Can I make a suggestion, that you ditch the original hoses and go for a larger bore loop where possible? I found the WOB a bit heavy with standard hoses. I know that there are fittings in the loop that are still only 25mm but at least they are smooth bore. The issue with the hoses is that the ribbing in them is effectively a bunch of baffles and it increases the WOB. If you fit larger bore hoses to the original fittings, you at least reduce the baffle effect. Worked for me.

Yes, you are correct. I have already swapped the originals for a Ray DSV and hoses. Check out my IDA71 unit here: A. B. C.

I want to use the Russian hoses for another project with an O2 homebuilt. WOB should not be an issue at those depths.

Thx,
George

**SeaBass** · 31st January 2008, 06:13

Just my 2 cents but I would recommend throwing the russian stuff in the garbage can.

The hoses are small and the DSV is made to be used with a FFM and is too heavy (even if you get an adapter). Your better off with sewer pipe and a ball valve for a homebuild. (keep it original)

Thom

jaap · 31st January 2008, 07:11

Quote: (Originally Posted by GKAM)

Yes, you are correct. I have already swapped the originals for a Ray DSV and hoses. Check out my IDA71 unit here: A. B. C.

I want to use the Russian hoses for another project with an O2 homebuilt. WOB should not be an issue at those depths.

Thx,
George

Hi

I'm quite convinced the ID of the IDA-71 hoses are slightly larger ID than the hoses on the IDA-76.

At least I know the barbed Inspiration threaded fitting on my very old Divematics BOV fits snugly on the IDA-71 hose. But its a pain, very hard work, almost impossible to push it on the IDA-76 hose.

Don't have the things in front of me but if my notes are not wrong the max OD (on the rim) of the DSV fitting for the IDA-76 is about 27-28 mm (the thing that the hose slides over) . The max OD on the shell/chassis hose fitting of my IDA-71 is about 29 mm.

If its any help I can measure it very late tonight if I make it home this evening.

I'm sure from experience of the Rebreather's at home that the 76 and 59 have the smallest hose ID. My 51 is slightly larger ID, or perhaps that it has only streched a little since it was made in 1954... The IDA-71 definately appear to have an even slighly larger ID (perhaps 1-2 mm?). And then of course the 72 breathing hose that has a much bigger hose/connector.

So the IDA-hoses can perhaps have slightly batch/age dependent ID and elasticity.

Anyway for O2-Rebreather diving I would not have a problem with using any IDA-hose.

Skipbreather · 31st January 2008, 18:31

All this supposing got me off my duff & I hobbled down the stairs (long story), went to the big box-‘o-hose-spares, and got a new IDA71 hose out of it’s wrapper & put the calipers to it. ID of the cuff measured 0.923 inches.

Done deal.

Ken

30th January 2008, 19:55	#1 (permalink)
GKAM digital nomad Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Greece Posts: 252	HELP NEEDED: IDA71 Hose diameter Hi all, I am 2.000km away from my IDA71 but I need to know the internal hose diameter so I can get a male P-port adaptor made. Can any IDA71 (or IDA59, IDA64 etc) owner please measure the internal diameter of the hose? Your help would be much appreciated. Green awaits. Thanks, George __________________ Stay #
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30th January 2008, 23:33	#2 (permalink)
bythesea New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Nov 2006 Location: W.Mass, USA Posts: 74	Re: HELP NEEDED: IDA71 Hose diameter Quote: (Originally Posted by GKAM) Hi all, I am 2.000km away from my IDA71 but I need to know the internal hose diameter so I can get a male P-port adaptor made. Can any IDA71 (or IDA59, IDA64 etc) owner please measure the internal diameter of the hose? Your help would be much appreciated. Green awaits. Thanks, George I only have a 76 available so I can't measure the scrubber end of the hoses . At the DSV end the tube fitting the hose fits over has a smallest diameter of 1.05" and largest of 1.065"(it is slightly tapered). There is a bead at the end of the fitting to help secure the clamped hose measuring 1.085". Anyway 1.065" would probably do it assuming both ends of a 71 hose are identical.
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30th January 2008, 23:43	#3 (permalink)
kiwi_diver Alias - Ray Mansell Current Rebreather/s: Other SCR Other Rebreather/s: Other SCR Join Date: Aug 2007 Location: Auckland, New Zealand Posts: 157	Re: HELP NEEDED: IDA71 Hose diameter From original metalic soviet DSV as used on IDA-64 and AKA-60: 25mm. __________________ Ray. == Latitude 36 South, where the deeper you dive, the warmer it gets! ==
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31st January 2008, 00:10	#4 (permalink)
GKAM digital nomad Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Greece Posts: 252	Re: HELP NEEDED: IDA71 Hose diameter Quote: (Originally Posted by bythesea) I only have a 76 available so I can't measure the scrubber end of the hoses . At the DSV end the tube fitting the hose fits over has a smallest diameter of 1.05" and largest of 1.065"(it is slightly tapered). There is a bead at the end of the fitting to help secure the clamped hose measuring 1.085". Anyway 1.065" would probably do it assuming both ends of a 71 hose are identical. OK, thanks very much ! AFAIK all the popular Soviet Rebreather rigs use the same hoses and DSV connectors except the large IDA72. So just to confirm: The smallest internal diameter of the hose you mesured is 1.05" (i.e. 26.7mm)? I put together a collage to show the measurement I am looking for (minus the Russian fitting). I am trying to convert the original hose to accept a male P-port connector. Depending on the internal diameter, I will go for delrin/ertalon/pvc or brass. I would like to avoid the use of a lathe for the brass option and get the part direct from Martin at TecMe... (Thanks Martin and Dave, sorry for "borrowing" your photos ) /GKAM __________________ Stay #
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31st January 2008, 00:49	#5 (permalink)
bythesea New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Nov 2006 Location: W.Mass, USA Posts: 74	Re: HELP NEEDED: IDA71 Hose diameter Quote: (Originally Posted by GKAM) OK, thanks very much ! AFAIK all the popular Soviet Rebreather rigs use the same hoses and DSV connectors except the large IDA72. So just to confirm: The smallest internal diameter of the hose you mesured is 1.05" (i.e. 26.7mm)? Could not get accurate measurement of the hose with a micrometer so I measured the OD of the fitting it goes on. The smallest ID of the hose should be 1.05" so thats the ID of your fitting. When you make the p-port fitting you would want to leave a bead 1.085" at the end to help secure the hose. I checked the ID of that fitting as well and it's roughly 25mm so that probably where we get different numbers. Last edited by bythesea : 31st January 2008 at 00:52.
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31st January 2008, 01:13	#6 (permalink)
kiwi_diver Alias - Ray Mansell Current Rebreather/s: Other SCR Other Rebreather/s: Other SCR Join Date: Aug 2007 Location: Auckland, New Zealand Posts: 157	Re: HELP NEEDED: IDA71 Hose diameter Can I make a suggestion, that you ditch the original hoses and go for a larger bore loop where possible? I found the WOB a bit heavy with standard hoses. I know that there are fittings in the loop that are still only 25mm but at least they are smooth bore. The issue with the hoses is that the ribbing in them is effectively a bunch of baffles and it increases the WOB. If you fit larger bore hoses to the original fittings, you at least reduce the baffle effect. Worked for me. __________________ Ray. == Latitude 36 South, where the deeper you dive, the warmer it gets! ==
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31st January 2008, 05:03	#7 (permalink)
GKAM digital nomad Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Greece Posts: 252	Re: HELP NEEDED: IDA71 Hose diameter Quote: (Originally Posted by kiwi_diver) Can I make a suggestion, that you ditch the original hoses and go for a larger bore loop where possible? I found the WOB a bit heavy with standard hoses. I know that there are fittings in the loop that are still only 25mm but at least they are smooth bore. The issue with the hoses is that the ribbing in them is effectively a bunch of baffles and it increases the WOB. If you fit larger bore hoses to the original fittings, you at least reduce the baffle effect. Worked for me. Yes, you are correct. I have already swapped the originals for a Ray DSV and hoses. Check out my IDA71 unit here: A. B. C. I want to use the Russian hoses for another project with an O2 homebuilt. WOB should not be an issue at those depths. Thx, George __________________ Stay #
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31st January 2008, 06:13	#8 (permalink)
SeaBass Thom Susko Current Rebreather/s: Megalodon Ray Home Build Other Rebreather/s: Not Bought Yet Ray Home Build Join Date: Jul 2006 Location: San Clemente, CA Posts: 232	Re: HELP NEEDED: IDA71 Hose diameter Just my 2 cents but I would recommend throwing the russian stuff in the garbage can. The hoses are small and the DSV is made to be used with a FFM and is too heavy (even if you get an adapter). Your better off with sewer pipe and a ball valve for a homebuild. (keep it original) Thom
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31st January 2008, 07:11	#9 (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: 451	Re: HELP NEEDED: IDA71 Hose diameter Quote: (Originally Posted by GKAM) Yes, you are correct. I have already swapped the originals for a Ray DSV and hoses. Check out my IDA71 unit here: A. B. C. I want to use the Russian hoses for another project with an O2 homebuilt. WOB should not be an issue at those depths. Thx, George Hi I'm quite convinced the ID of the IDA-71 hoses are slightly larger ID than the hoses on the IDA-76. At least I know the barbed Inspiration threaded fitting on my very old Divematics BOV fits snugly on the IDA-71 hose. But its a pain, very hard work, almost impossible to push it on the IDA-76 hose. Don't have the things in front of me but if my notes are not wrong the max OD (on the rim) of the DSV fitting for the IDA-76 is about 27-28 mm (the thing that the hose slides over) . The max OD on the shell/chassis hose fitting of my IDA-71 is about 29 mm. If its any help I can measure it very late tonight if I make it home this evening. I'm sure from experience of the Rebreather's at home that the 76 and 59 have the smallest hose ID. My 51 is slightly larger ID, or perhaps that it has only streched a little since it was made in 1954... The IDA-71 definately appear to have an even slighly larger ID (perhaps 1-2 mm?). And then of course the 72 breathing hose that has a much bigger hose/connector. So the IDA-hoses can perhaps have slightly batch/age dependent ID and elasticity. Anyway for O2-Rebreather diving I would not have a problem with using any IDA-hose. __________________ My initials: JAAP Last edited by jaap : 31st January 2008 at 07:15.
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31st January 2008, 18:31	#10 (permalink)
Skipbreather Reads the fine print Current Rebreather/s: Megalodon Home Build Other Rebreather/s: Not Bought Yet MK 15.X Home Build Join Date: Mar 2005 Location: Chicago, Illinois, USA Posts: 555	Re: HELP NEEDED: IDA71 Hose diameter All this supposing got me off my duff & I hobbled down the stairs (long story), went to the big box-‘o-hose-spares, and got a new IDA71 hose out of it’s wrapper & put the calipers to it. ID of the cuff measured 0.923 inches. Done deal. Ken __________________ "Entropy RULES! Enjoy the interim."
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