Scrubber bypass Ida-64

robertfondren · 9th November 2007, 09:09

Does anyone know if the IDA-64 is subject to the same co2 bypass in the counterlung as the IDA-71? I've got one on order, and will be tearing it down ASAP, just trying (always) to avoid problems before they happen.
Thanks
Ps. Anybody know the interior diameter of the low-pressure hose from the 02 tank to the counterlung?

Skipbreather · 9th November 2007, 13:42

Quote: (Originally Posted by robertfondren)

Does anyone know if the IDA-64 is subject to the same co2 bypass in the counterlung as the IDA-71? I've got one on order, and will be tearing it down ASAP, just trying (always) to avoid problems before they happen.
Thanks
Ps. Anybody know the interior diameter of the low-pressure hose from the 02 tank to the counterlung?

The IDA64 has the same basic bag architecture as the IDA71, namely the exhaled gas runs inside the bag and is split at a “T” to go to two scrubber cans. The cans are then connected to the breathing circuit at the bottom of the bag on the outside. I’ve not had the bag of either of my 64s apart, but given the Russian propensity for cookie-cutter build up of gear, my bet would be that the same Achilles’ heel that has come very near to killing several divers on the 71 does indeed exist in the 64.

Dive safe,
Ken

robertfondren · 11th November 2007, 05:10

Thanks!

s. McWilliam · 31st March 2008, 06:19

March 30, 2008
Ken’s comment was an attention getter. Are you referring to the standard problem that is the second canister is no filled with O3 there is no way of replenishing the used O2 in Nitrox mode or is there some other problem with the plumbing?
Scott

Packhorse · 31st March 2008, 07:51

The problem is with the hose "T" hose that connects the exhale hose from the DSV to the 2 scrubbers. This is internal in the CL. The hose clamps can fail meaning exhailed gas can bypass the scrubbers and be pushed into the counterlung which is on the inhale side of the loop. This means the gas does not get scrubbed of CO2 and the user has no warning of what is happening.

I am working on a IDA71 and have solved the problem by using 1 scrubber and connecting it to the exhale hose externally to the lung.

osiris · 31st March 2008, 08:52

there are a number of reported methods of securing the exhalation hose inside the IDA-64 (and IDA-71). On mine, it was secured with twine, on others plastic and metal hose clamps have been reported - sometimes a mixture of all three. Reportedly, the twine bindings are "safer". The metal and plastic ones are apparently quite often in a very dangerous state, especially if the unit has been used (mine was brand new and in excellent condition but I'm replacing the fixings anyway). Best bet is to replace the internal exhalation hose and do waht Pack_horse has done, if he'll post the picture (food grade hose bypassing the C/L completely).

Packhorse · 31st March 2008, 09:13

kiwi_diver · 31st March 2008, 19:45

Quote: (Originally Posted by Packhorse)

I am working on a IDA71 and have solved the problem by using 1 scrubber and connecting it to the exhale hose externally to the lung.

Nice job Greg, you're making good progress! What did you end up using for patches and glue?

Packhorse · 31st March 2008, 23:43

I used 1.2mm thick EPDM rubber from Pararubber and aquasealed it on.
Make sure you buff up the rubber with sandpaper first. Seems to work really well.

s. McWilliam · 27th April 2008, 10:51

OK I decided to check out the plumbing in mine. At first glance I thought the chances of mouse lungs McWilliam blowing off one of the conceptions were about the same as me orally over inflating a truck tire. After a little checking I found the connections put on with twine were sound however there was also a connection with wire, and two of the wire strands were broken. This means the hose was held on with tape and friction. The IDA 72 uses a corrugated hose to do this job. If your looking for something from the world of diving that is off the shelf that does the job try a nine inch "big bore" hose. They were used on a number of buoyancy compensators. The hose is the right length to fit without kinking and has one inch diameter cuffs at each end (making it nearly a foot long) for clamping, glueing whatever and the inside diameter is as large as or larger than the hose on the rest of the system so there is nothing to impede gas flow.
Scott

9th November 2007, 09:09	#1 (permalink)
robertfondren New Member Current Rebreather/s: Ray Other Rebreather/s: Not Bought Yet Ray Join Date: Mar 2006 Location: u.s.a. Posts: 74	Scrubber bypass Ida-64 Does anyone know if the IDA-64 is subject to the same co2 bypass in the counterlung as the IDA-71? I've got one on order, and will be tearing it down ASAP, just trying (always) to avoid problems before they happen. Thanks Ps. Anybody know the interior diameter of the low-pressure hose from the 02 tank to the counterlung?
(Offline)

9th November 2007, 13:42	#2 (permalink)
Skipbreather WAY past the barber pole 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: 528	Re: Scrubber bypass Ida-64 Quote: (Originally Posted by robertfondren) Does anyone know if the IDA-64 is subject to the same co2 bypass in the counterlung as the IDA-71? I've got one on order, and will be tearing it down ASAP, just trying (always) to avoid problems before they happen. Thanks Ps. Anybody know the interior diameter of the low-pressure hose from the 02 tank to the counterlung? The IDA64 has the same basic bag architecture as the IDA71, namely the exhaled gas runs inside the bag and is split at a “T” to go to two scrubber cans. The cans are then connected to the breathing circuit at the bottom of the bag on the outside. I’ve not had the bag of either of my 64s apart, but given the Russian propensity for cookie-cutter build up of gear, my bet would be that the same Achilles’ heel that has come very near to killing several divers on the 71 does indeed exist in the 64. Dive safe, Ken __________________ "Entropy RULES! Enjoy the interim."
(Offline)

11th November 2007, 05:10	#3 (permalink)
robertfondren New Member Current Rebreather/s: Ray Other Rebreather/s: Not Bought Yet Ray Join Date: Mar 2006 Location: u.s.a. Posts: 74	Re: Scrubber bypass Ida-64 Thanks!
(Offline)

31st March 2008, 06:19	#4 (permalink)
s. McWilliam New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2008 Location: Canada Posts: 2	Re: Scrubber bypass Ida-64 March 30, 2008 Ken’s comment was an attention getter. Are you referring to the standard problem that is the second canister is no filled with O3 there is no way of replenishing the used O2 in Nitrox mode or is there some other problem with the plumbing? Scott
(Offline)

31st March 2008, 07:51	#5 (permalink)
Packhorse Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jan 2008 Location: Auckland New Zealand Posts: 100	Re: Scrubber bypass Ida-64 The problem is with the hose "T" hose that connects the exhale hose from the DSV to the 2 scrubbers. This is internal in the CL. The hose clamps can fail meaning exhailed gas can bypass the scrubbers and be pushed into the counterlung which is on the inhale side of the loop. This means the gas does not get scrubbed of CO2 and the user has no warning of what is happening. I am working on a IDA71 and have solved the problem by using 1 scrubber and connecting it to the exhale hose externally to the lung. __________________ There are no stupid questions, but there are a LOT of inquisitive idiots.
(Offline)

31st March 2008, 08:52	#6 (permalink)
osiris Custom Title Allowed! Current Rebreather/s: Inspiration Classic Sport Kiss Home Build Other Rebreather/s: Home Build Join Date: Feb 2006 Location: Auckland Posts: 230	Re: Scrubber bypass Ida-64 there are a number of reported methods of securing the exhalation hose inside the IDA-64 (and IDA-71). On mine, it was secured with twine, on others plastic and metal hose clamps have been reported - sometimes a mixture of all three. Reportedly, the twine bindings are "safer". The metal and plastic ones are apparently quite often in a very dangerous state, especially if the unit has been used (mine was brand new and in excellent condition but I'm replacing the fixings anyway). Best bet is to replace the internal exhalation hose and do waht Pack_horse has done, if he'll post the picture (food grade hose bypassing the C/L completely).
(Offline)

31st March 2008, 09:13	#7 (permalink)
Packhorse Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jan 2008 Location: Auckland New Zealand Posts: 100	Re: Scrubber bypass Ida-64 __________________ There are no stupid questions, but there are a LOT of inquisitive idiots.
(Offline)

31st March 2008, 19:45	#8 (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: Scrubber bypass Ida-64 Quote: (Originally Posted by Packhorse) I am working on a IDA71 and have solved the problem by using 1 scrubber and connecting it to the exhale hose externally to the lung. Nice job Greg, you're making good progress! What did you end up using for patches and glue? __________________ Ray. == Latitude 36 South, where the deeper you dive, the warmer it gets! ==
(Offline)

31st March 2008, 23:43	#9 (permalink)
Packhorse Custom Title Allowed! Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Jan 2008 Location: Auckland New Zealand Posts: 100	Re: Scrubber bypass Ida-64 I used 1.2mm thick EPDM rubber from Pararubber and aquasealed it on. Make sure you buff up the rubber with sandpaper first. Seems to work really well. __________________ There are no stupid questions, but there are a LOT of inquisitive idiots.
(Offline)

27th April 2008, 10:51	#10 (permalink)
s. McWilliam New Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2008 Location: Canada Posts: 2	Re: Scrubber bypass Ida-64 OK I decided to check out the plumbing in mine. At first glance I thought the chances of mouse lungs McWilliam blowing off one of the conceptions were about the same as me orally over inflating a truck tire. After a little checking I found the connections put on with twine were sound however there was also a connection with wire, and two of the wire strands were broken. This means the hose was held on with tape and friction. The IDA 72 uses a corrugated hose to do this job. If your looking for something from the world of diving that is off the shelf that does the job try a nine inch "big bore" hose. They were used on a number of buoyancy compensators. The hose is the right length to fit without kinking and has one inch diameter cuffs at each end (making it nearly a foot long) for clamping, glueing whatever and the inside diameter is as large as or larger than the hose on the rest of the system so there is nothing to impede gas flow. Scott
(Offline)

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