Modifying Inspiration "T" fittings to reduce WOB

S. Marc · 1st April 2007, 07:54

Has anyone tried to reduce the length or size of the Tab located within the "T" fittings to see if it improved the WOB on an Inspo?

I know this tab is supposed to assist in diverting water and condensation into the counterlungs as opposed to the scrubber, but it looks rather restrictive to me.

I have a spare T fitting as I am using an ADV from oxycheq which if memory serves correctly does not have this tab.

Does the Meg "T" fitting have this type of tab?

Thanks,

Marc

**nigelh** · 1st April 2007, 08:47

Quote: (Originally Posted by S. Marc)

Has anyone tried to reduce the length or size of the Tab located within the "T" fittings to see if it improved the WOB on an Inspo?

I know this tab is supposed to assist in diverting water and condensation into the counterlungs as opposed to the scrubber, but it looks rather restrictive to me.

Gas flow is part of my business and it doesn't look the slightest bit restrictive to me while those corrugated hoses give me the creeps.

Secondly are you aware of WOB? I'm not so it would take a sensitive machine to measure the difference. Certainly if you just breath the hose with nothing screwed in where the T-pieces go it doesn't feel significantly different. I am surprised how little difference that great block of 'lime makes.

Sorry to be a downer....

***Decodiver*** · 1st April 2007, 10:49

I would say that they are a safety feature that should not be removed.

From memory earlier Inspirations only had them on the exhale side and then they were also introduced on the inhale side too, guess thay are there for a reason...

As Nigel says the turbulence caused by corrugated hoses is more worrying.

Cheers,

Dave Cooper.

DepthCharge · 1st April 2007, 14:57

Quote: (Originally Posted by Decodiver)

From memory earlier Inspirations only had them on the exhale side and then they were also introduced on the inhale side too, guess thay are there for a reason...

Errrrrrrrrrr........... isn't that backwards? Earlier ones has them on both exhale and inhale sides. When they came out with the ADV, the one on the inhale side disappeared. However, I maybe mistaken.

Gobfish1 · 1st April 2007, 16:22

Quote: (Originally Posted by DepthCharge)

Errrrrrrrrrr........... isn't that backwards? Earlier ones has them on both exhale and inhale sides. When they came out with the ADV, the one on the inhale side disappeared. However, I maybe mistaken.

none on the ADV side now

***Decodiver*** · 1st April 2007, 18:42

There you go then, it's been a long time since I looked......

Gobfish1 · 1st April 2007, 18:57

Quote: (Originally Posted by Decodiver)

There you go then, it's been a long time since I looked......

my box is sat on the floor right next to me ,
other than that i would not have Known,

diverklondike · 2nd April 2007, 03:13

Quote: (Originally Posted by S. Marc)

Has anyone tried to reduce the length or size of the Tab located within the "T" fittings to see if it improved the WOB on an Inspo?

I know this tab is supposed to assist in diverting water and condensation into the counterlungs as opposed to the scrubber, but it looks rather restrictive to me.

I have a spare T fitting as I am using an ADV from oxycheq which if memory serves correctly does not have this tab.

Does the Meg "T" fitting have this type of tab?

Thanks,

Marc

Are you having WOB issue with your Inspiration that is causing you to consider this??

S. Marc · 2nd April 2007, 04:30

Thanks for the input.

I am using the BI OTS lungs on a homebuild, not an inspiration, and got a chance to see the almost finished newly designed aluminum lid for the center section at the machine shop on Friday. The inhale and exhale tubes on the center section lid are just over 1 1/4 inch ID so the plan is to remove as many restrictions as I can in the breathing loop to prevent as many small ID flow paths as possible. I did not have difficulty using larger inhale and exhale tubes with the prior lid on the homebuild, but for design reasons (use of a radial scrubber as opposed to axial) I had to go with smaller diameter fittings on the head.

Does anyone know if the Meg uses these tabs in the "T" pieces for water diversion (I have no idea of what they are actually called)

Prior diving using the old lid on this homebuilt was with the lungs mounted so that the T pieces on the BI lungs were slightly forward of my shoulder so very little water/condensation entered the scrubber when diving. I realize that this tap is probably designed to allow condensation to drip downwards into the lung.

The design of the radial I am in the process of finalizing is an out in one, with a large water trap in the bottom of the can that can be varied depending on the size of the scrubber being used and the spacer below it, so it should be able to tolerate a significant amount of water or condensation if there are any issues.

Marc

***jradomski*** · 2nd April 2007, 05:42

Quote: (Originally Posted by S. Marc)

Does anyone know if the Meg uses these tabs in the "T" pieces for water diversion (I have no idea of what they are actually called)

.

Marc

yes both t pieces

1st April 2007, 07:54	#1 (permalink)
S. Marc RBW Member Current Rebreather/s: Classic Kiss MK 15.X Other Rebreather/s: Not Bought Yet Join Date: Dec 2005 Posts: 204	Modifying Inspiration "T" fittings to reduce WOB Has anyone tried to reduce the length or size of the Tab located within the "T" fittings to see if it improved the WOB on an Inspo? I know this tab is supposed to assist in diverting water and condensation into the counterlungs as opposed to the scrubber, but it looks rather restrictive to me. I have a spare T fitting as I am using an ADV from oxycheq which if memory serves correctly does not have this tab. Does the Meg "T" fitting have this type of tab? Thanks, Marc
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1st April 2007, 08:47	#2 (permalink)
nigelh New member Current Rebreather/s: Inspiration Vision Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Mar 2005 Location: Brighton, Sussex, UK Posts: 883	Re: Modifying Inspiration "T" fittings to reduce WOB Quote: (Originally Posted by S. Marc) Has anyone tried to reduce the length or size of the Tab located within the "T" fittings to see if it improved the WOB on an Inspo? I know this tab is supposed to assist in diverting water and condensation into the counterlungs as opposed to the scrubber, but it looks rather restrictive to me. Gas flow is part of my business and it doesn't look the slightest bit restrictive to me while those corrugated hoses give me the creeps. Secondly are you aware of WOB? I'm not so it would take a sensitive machine to measure the difference. Certainly if you just breath the hose with nothing screwed in where the T-pieces go it doesn't feel significantly different. I am surprised how little difference that great block of 'lime makes. Sorry to be a downer.... __________________ nigelh
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1st April 2007, 10:49	#3 (permalink)
*Decodiver* Administrator Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,194	Re: Modifying Inspiration "T" fittings to reduce WOB I would say that they are a safety feature that should not be removed. From memory earlier Inspirations only had them on the exhale side and then they were also introduced on the inhale side too, guess thay are there for a reason... As Nigel says the turbulence caused by corrugated hoses is more worrying. Cheers, Dave Cooper. __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
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1st April 2007, 14:57	#4 (permalink)
DepthCharge New Member Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Home Build Join Date: Mar 2005 Location: upstate NY Posts: 234	Re: Modifying Inspiration "T" fittings to reduce WOB Quote: (Originally Posted by Decodiver) From memory earlier Inspirations only had them on the exhale side and then they were also introduced on the inhale side too, guess thay are there for a reason... Errrrrrrrrrr........... isn't that backwards? Earlier ones has them on both exhale and inhale sides. When they came out with the ADV, the one on the inhale side disappeared. However, I maybe mistaken. __________________ Later, John It's better to beg forgiveness than ask permission
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1st April 2007, 16:22	#5 (permalink)
Gobfish1 RBW Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Join Date: Apr 2005 Location: Manchester UK Posts: 409	Re: Modifying Inspiration "T" fittings to reduce WOB Quote: (Originally Posted by DepthCharge) Errrrrrrrrrr........... isn't that backwards? Earlier ones has them on both exhale and inhale sides. When they came out with the ADV, the one on the inhale side disappeared. However, I maybe mistaken. none on the ADV side now __________________ Steve G Apparently not the only gay diver in the village http://drinkingliberally.org/blogs/o...nzee-glock.gif http://www.scubatunes.com/audio/vol01/mp3/HiTech.mp3
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1st April 2007, 18:42	#6 (permalink)
*Decodiver* Administrator Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jan 2005 Location: Geneva Posts: 2,194	Re: Modifying Inspiration "T" fittings to reduce WOB There you go then, it's been a long time since I looked...... __________________ CCR/OC Trimix Instructor Trainer CCR Training to Mixed Gas in Switzerland, France, UK & Germany on Megalodon/COPIS-Megalodon/KISS/Sport KISS/Ouroboros/rEvo/Inspiration/Evolution/Sentinel www.zerogravitydiving.com Rebreather World Terms & Conditions
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1st April 2007, 18:57	#7 (permalink)
Gobfish1 RBW Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Join Date: Apr 2005 Location: Manchester UK Posts: 409	Re: Modifying Inspiration "T" fittings to reduce WOB Quote: (Originally Posted by Decodiver) There you go then, it's been a long time since I looked...... my box is sat on the floor right next to me , other than that i would not have Known, __________________ Steve G Apparently not the only gay diver in the village http://drinkingliberally.org/blogs/o...nzee-glock.gif http://www.scubatunes.com/audio/vol01/mp3/HiTech.mp3
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2nd April 2007, 03:13	#8 (permalink)
diverklondike RBW Member Current Rebreather/s: Inspiration Classic Other CCR Other Rebreather/s: Inspiration Classic Other CCR Join Date: Oct 2005 Location: Delaware, USA Posts: 1,714	Re: Modifying Inspiration "T" fittings to reduce WOB Quote: (Originally Posted by S. Marc) Has anyone tried to reduce the length or size of the Tab located within the "T" fittings to see if it improved the WOB on an Inspo? I know this tab is supposed to assist in diverting water and condensation into the counterlungs as opposed to the scrubber, but it looks rather restrictive to me. I have a spare T fitting as I am using an ADV from oxycheq which if memory serves correctly does not have this tab. Does the Meg "T" fitting have this type of tab? Thanks, Marc Are you having WOB issue with your Inspiration that is causing you to consider this??
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2nd April 2007, 04:30	#9 (permalink)
S. Marc RBW Member Current Rebreather/s: Classic Kiss MK 15.X Other Rebreather/s: Not Bought Yet Join Date: Dec 2005 Posts: 204	Re: Modifying Inspiration "T" fittings to reduce WOB Thanks for the input. I am using the BI OTS lungs on a homebuild, not an inspiration, and got a chance to see the almost finished newly designed aluminum lid for the center section at the machine shop on Friday. The inhale and exhale tubes on the center section lid are just over 1 1/4 inch ID so the plan is to remove as many restrictions as I can in the breathing loop to prevent as many small ID flow paths as possible. I did not have difficulty using larger inhale and exhale tubes with the prior lid on the homebuild, but for design reasons (use of a radial scrubber as opposed to axial) I had to go with smaller diameter fittings on the head. Does anyone know if the Meg uses these tabs in the "T" pieces for water diversion (I have no idea of what they are actually called) Prior diving using the old lid on this homebuilt was with the lungs mounted so that the T pieces on the BI lungs were slightly forward of my shoulder so very little water/condensation entered the scrubber when diving. I realize that this tap is probably designed to allow condensation to drip downwards into the lung. The design of the radial I am in the process of finalizing is an out in one, with a large water trap in the bottom of the can that can be varied depending on the size of the scrubber being used and the spacer below it, so it should be able to tolerate a significant amount of water or condensation if there are any issues. Marc
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2nd April 2007, 05:42	#10 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,115	Re: Modifying Inspiration "T" fittings to reduce WOB Quote: (Originally Posted by S. Marc) Does anyone know if the Meg uses these tabs in the "T" pieces for water diversion (I have no idea of what they are actually called) . Marc yes both t pieces __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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