O2 Clean IDA-76

JamesG · 8th June 2007, 22:47

Hi all,

I've recently acquired one these escape rebreathers and soon hope to have some shallow fun with it. Perhaps one of you can advise me ... did you strip the whole thing down to make sure the important bits were O2 clean, i.e. the on/off lever valve and bottles etc. With the bottles and the narrow necking between the cascades how can you be sure the tanks are properly dried if washed and won't corrode ..... or did you just assume they were ready to go?

Thanks

James

jaap · 11th June 2007, 02:23

Quote: (Originally Posted by JamesG)

Hi all,

I've recently acquired one these escape rebreathers and soon hope to have some shallow fun with it. Perhaps one of you can advise me ... did you strip the whole thing down to make sure the important bits were O2 clean, i.e. the on/off lever valve and bottles etc. With the bottles and the narrow necking between the cascades how can you be sure the tanks are properly dried if washed and won't corrode ..... or did you just assume they were ready to go?

Thanks

James

Hi

Its not really intended just as an escape Rebreather, but anyway.

I would not attempt to rinse the cascade. Use them as they come...or ditch the little cascade.

Its really easy to put the connector of your choice on the feed to the demand valve. This can be done in a destructive way by cutting the hose or by replacing the whole hose at it connection to the demande valve ("European 1/4" fitting) inside the bag. Or by making an adapter (using the small emergency bottle valve as a part if you wish) to fit the regular hose connector to feed any gas that way.

There are also other ways involving keeping the small regulator and switch but replacing/adding on to the cascade.

Or simply add a drysuit addition valve to the lung. If you don't want to cut a hole in the bag you can start by removing the OPV. That hole is perfect for an Apeks drysuit valve. That is if you feel OK about not having an OPV.

Anyway I don't worry about the cascade blowing up. Funny thing is its not even illegal to not care to much about that here where I live since cylinders of <1 liter volume are exempt from hyrdro testing ;-)

Me and friends have a total of five IDA-76s and none of them blew up the first time they got filled with O2 :-)

Anyway good luck! And don't forget to read some of the other IDA-76 related threads ( I would for example strongly suggest to remove the T on the inhale side)

JamesG · 11th June 2007, 12:48

Jaap

Thanks for the info, I was beginning to think my question was too newbie in nature! When I wrote escape I meant that this one was originally designed to escape from tanks that had stalled as a result of their snorkel breaching when they crossed rivers! - a frightening experience I'm sure!

I shall read the other threads as well and I will definetley look at disconecting the T piece inside the lung. I also noticed that inside the scrubber there is a bulkhead to separate the two sides do you think initially this was to contain O3 on one side and sodalime on the other .. or just for flow properties.

Thanks for the help

James

jaap · 12th June 2007, 15:01

Quote: (Originally Posted by JamesG)

Jaap

Thanks for the info, I was beginning to think my question was too newbie in nature! When I wrote escape I meant that this one was originally designed to escape from tanks that had stalled as a result of their snorkel breaching when they crossed rivers! - a frightening experience I'm sure!

I shall read the other threads as well and I will definetley look at disconecting the T piece inside the lung. I also noticed that inside the scrubber there is a bulkhead to separate the two sides do you think initially this was to contain O3 on one side and sodalime on the other .. or just for flow properties.

Thanks for the help

James

OK

I have the manual for it and had two russians read it with me. I would say its also used for std light army diving, say for inspecting engineering work and such. With 50% in the cascade and "O3" in the scrubber the max depth and time is 40 m for 15 min! I guess the pO2 can be quite funky... With 100% in the cascade its 10m for 60min. Of course this is by Russian safety standards...

According to the manual there is also a special scrubber that can take prefabricated blocks for "O3".

On the regular scrubber it has two serial compartments they are not in parallell like the scrubbers on the IDA-71. So I don't quite get how one could use "O3" in only one of them and not risk getting a pretty odd O2 production profile.

The serial compartments is actually quite handy. For me its enough to load only one of them for some easy shallow diving of less than one hour.

Corallaro · 12th June 2007, 15:53

This is my modded IDA-76 with IDA-71 1 liter tank
in this mode i can make the "washing of counterlung" with O2 (in italian "lavaggio del sacco polmone") with no problem of gas
Giovanni

Corallaro · 12th June 2007, 16:40

With new cover

Giovanni

Mikel-Deko · 12th June 2007, 16:57

Hi
You don't have underwater pictures or even better a video???

Anyway, very good job.

Best

Mikel

Corallaro · 12th June 2007, 17:27

Only pre or post dive photos of a previous mod (only a hose gauge)
as FFM i use an IDA-71 FFM with dump valve under the chin..
Giovanni

JamesG · 13th June 2007, 09:20

Jaap

Thanks for the extra info, I'm sure it would have been perfect for light engineering works and the like. With regard to the internal workings was there anything else you would not have found out without reading the manual.

Also have you weighed how much sofnalime you managed to get into one of the compartments?

Giovanni

That is a work of art, looks very professional!

Cheers

James

**Dave Sutton** · 13th June 2007, 23:41

Quote: (Originally Posted by Corallaro)

This is my modded IDA-76 with IDA-71 1 liter tank
in this mode i can make the "washing of counterlung" with O2 (in italian "lavaggio del sacco polmone") with no problem of gas
Giovanni

"Purging the counterlung" for the technical english language lesson of the day!

Nice work as usual! I expect nothing less from the LDSOH Italia!

Dave

8th June 2007, 22:47	#1 (permalink)
JamesG New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2005 Location: UK Posts: 8	O2 Clean IDA-76 Hi all, I've recently acquired one these escape rebreathers and soon hope to have some shallow fun with it. Perhaps one of you can advise me ... did you strip the whole thing down to make sure the important bits were O2 clean, i.e. the on/off lever valve and bottles etc. With the bottles and the narrow necking between the cascades how can you be sure the tanks are properly dried if washed and won't corrode ..... or did you just assume they were ready to go? Thanks James
(Offline)

11th June 2007, 02:23	#2 (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: O2 Clean IDA-76 Quote: (Originally Posted by JamesG) Hi all, I've recently acquired one these escape rebreathers and soon hope to have some shallow fun with it. Perhaps one of you can advise me ... did you strip the whole thing down to make sure the important bits were O2 clean, i.e. the on/off lever valve and bottles etc. With the bottles and the narrow necking between the cascades how can you be sure the tanks are properly dried if washed and won't corrode ..... or did you just assume they were ready to go? Thanks James Hi Its not really intended just as an escape Rebreather, but anyway. I would not attempt to rinse the cascade. Use them as they come...or ditch the little cascade. Its really easy to put the connector of your choice on the feed to the demand valve. This can be done in a destructive way by cutting the hose or by replacing the whole hose at it connection to the demande valve ("European 1/4" fitting) inside the bag. Or by making an adapter (using the small emergency bottle valve as a part if you wish) to fit the regular hose connector to feed any gas that way. There are also other ways involving keeping the small regulator and switch but replacing/adding on to the cascade. Or simply add a drysuit addition valve to the lung. If you don't want to cut a hole in the bag you can start by removing the OPV. That hole is perfect for an Apeks drysuit valve. That is if you feel OK about not having an OPV. Anyway I don't worry about the cascade blowing up. Funny thing is its not even illegal to not care to much about that here where I live since cylinders of <1 liter volume are exempt from hyrdro testing ;-) Me and friends have a total of five IDA-76s and none of them blew up the first time they got filled with O2 :-) Anyway good luck! And don't forget to read some of the other IDA-76 related threads ( I would for example strongly suggest to remove the T on the inhale side) __________________ My initials: JAAP
(Offline)

11th June 2007, 12:48	#3 (permalink)
JamesG New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2005 Location: UK Posts: 8	Re: O2 Clean IDA-76 Jaap Thanks for the info, I was beginning to think my question was too newbie in nature! When I wrote escape I meant that this one was originally designed to escape from tanks that had stalled as a result of their snorkel breaching when they crossed rivers! - a frightening experience I'm sure! I shall read the other threads as well and I will definetley look at disconecting the T piece inside the lung. I also noticed that inside the scrubber there is a bulkhead to separate the two sides do you think initially this was to contain O3 on one side and sodalime on the other .. or just for flow properties. Thanks for the help James
(Offline)

12th June 2007, 15:01	#4 (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: O2 Clean IDA-76 Quote: (Originally Posted by JamesG) Jaap Thanks for the info, I was beginning to think my question was too newbie in nature! When I wrote escape I meant that this one was originally designed to escape from tanks that had stalled as a result of their snorkel breaching when they crossed rivers! - a frightening experience I'm sure! I shall read the other threads as well and I will definetley look at disconecting the T piece inside the lung. I also noticed that inside the scrubber there is a bulkhead to separate the two sides do you think initially this was to contain O3 on one side and sodalime on the other .. or just for flow properties. Thanks for the help James OK I have the manual for it and had two russians read it with me. I would say its also used for std light army diving, say for inspecting engineering work and such. With 50% in the cascade and "O3" in the scrubber the max depth and time is 40 m for 15 min! I guess the pO2 can be quite funky... With 100% in the cascade its 10m for 60min. Of course this is by Russian safety standards... According to the manual there is also a special scrubber that can take prefabricated blocks for "O3". On the regular scrubber it has two serial compartments they are not in parallell like the scrubbers on the IDA-71. So I don't quite get how one could use "O3" in only one of them and not risk getting a pretty odd O2 production profile. The serial compartments is actually quite handy. For me its enough to load only one of them for some easy shallow diving of less than one hour. __________________ My initials: JAAP
(Offline)

12th June 2007, 16:57	#7 (permalink)
Mikel-Deko RBW Member Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Other CCR Join Date: Jul 2005 Location: Basque Country -Sp- Posts: 476	Re: O2 Clean IDA-76 Hi You don't have underwater pictures or even better a video??? Anyway, very good job. Best Mikel __________________ Mikel-Deko Basque Country www.olatu.net "DIR is the nanny state for divers who cannot think on their own" Ron Micjan
(Offline)

13th June 2007, 09:20	#9 (permalink)
JamesG New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jun 2005 Location: UK Posts: 8	Re: O2 Clean IDA-76 Jaap Thanks for the extra info, I'm sure it would have been perfect for light engineering works and the like. With regard to the internal workings was there anything else you would not have found out without reading the manual. Also have you weighed how much sofnalime you managed to get into one of the compartments? Giovanni That is a work of art, looks very professional! Cheers James
(Offline)

13th June 2007, 23:41	#10 (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: O2 Clean IDA-76 Quote: (Originally Posted by Corallaro) This is my modded IDA-76 with IDA-71 1 liter tank in this mode i can make the "washing of counterlung" with O2 (in italian "lavaggio del sacco polmone") with no problem of gas Giovanni "Purging the counterlung" for the technical english language lesson of the day! Nice work as usual! I expect nothing less from the LDSOH Italia! Dave __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com
(Offline)

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode