Basic T piece makeup

**jepuskar** · 23rd December 2006, 23:01

Ok, I'm new so here is a basic question on T pieces using the APD Evolution as an example.

When you exhale it travels in the hose to a T piece....your exhaled breath then goes into the exhalation bag and back up to the stack. My question is on the physical makeup of the T piece on the inside. Externally I can see it is a T, but internally?

Thank you.

Jason

Chris · 24th December 2006, 01:00

Hi Jeps
I dont have an Evo, but here is the guts of a Meg T piece.
Basically the section you see inside in the middle forms a kind of wall between the two sides, this acts as a water trap so any water in the breathing hoses is forced into the lungs and does not continue round the loop. you can then (depending on the CCR) purge the water from the lungs, in the Megs case by using the OPV that is located near the bottom of the lung

Cheers
Chriso

**jepuskar** · 24th December 2006, 01:04

Thanks Chris....I've read about the EVO's watertraps at the T pieces, and you would think that would make sense...but noooooooooo...it takes your pictures.

If that stop wasnt there the water could go straight to the scrubber bypassing the inhale bag.

Chris · 24th December 2006, 01:31

Quote: (Originally Posted by jepuskar)

If that stop wasnt there the water could go straight to the scrubber bypassing the inhale bag.

Yep thats the plan.
There are lots of different ways to do it as you can see the PRISM for example does not use a T piece at all but instead the loop to and from the mouth enters the lung in the front, but the loop to the head enters and exits from the back of the lung.

Cheers
Chriso

**jepuskar** · 24th December 2006, 02:28

Ahh the PRISM, Chriso....your favorite rebreather.

Chris · 24th December 2006, 02:40

Quote: (Originally Posted by jepuskar)

Ahh the PRISM, Chriso....your favorite rebreather.

No comment, its Christmas

Does anyone have photos of the other OTS CCR's Optima , Vision Inspo/Evo did they change from the classic?

Would be nice to see them all side by side.

Cheers
Chriso

silent running · 24th December 2006, 04:40

Jason, Chris's pix are good for understanding how the T pcs do their job. Incidentally, you can see from the Prism px that the ADV/dil add is right next to the inhale port, which gives you direct access to clean gas, it's the only CCR that has this placement. It's also the only one that places the manual O2 and dil add buttons in very different parts of the CLs-dil add up high right by inhale hose and O2 add down at the bottom and on the side of the exhale CL. Makes them hard to get mixed up in an emergencey. More excelent design...

23rd December 2006, 23:01	#1 (permalink)
jepuskar NA Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Aug 2005 Location: Chicago, IL Posts: 396	Basic T piece makeup Ok, I'm new so here is a basic question on T pieces using the APD Evolution as an example. When you exhale it travels in the hose to a T piece....your exhaled breath then goes into the exhalation bag and back up to the stack. My question is on the physical makeup of the T piece on the inside. Externally I can see it is a T, but internally? Thank you. Jason
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24th December 2006, 01:04	#3 (permalink)
jepuskar NA Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Aug 2005 Location: Chicago, IL Posts: 396	Re: Basic T piece makeup Thanks Chris....I've read about the EVO's watertraps at the T pieces, and you would think that would make sense...but noooooooooo...it takes your pictures. If that stop wasnt there the water could go straight to the scrubber bypassing the inhale bag.
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24th December 2006, 02:28	#5 (permalink)
jepuskar NA Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Aug 2005 Location: Chicago, IL Posts: 396	Re: Basic T piece makeup Ahh the PRISM, Chriso....your favorite rebreather.
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24th December 2006, 02:40	#6 (permalink)
Chris Go Nude Or Go Home Current Rebreather/s: Megalodon Other Rebreather/s: Inspiration Classic Megalodon Prism Topaz Sport Kiss Join Date: Feb 2005 Location: Perth, Western Australia Posts: 607	Re: Basic T piece makeup Quote: (Originally Posted by jepuskar) Ahh the PRISM, Chriso....your favorite rebreather. No comment, its Christmas Does anyone have photos of the other OTS CCR's Optima , Vision Inspo/Evo did they change from the classic? Would be nice to see them all side by side. Cheers Chriso __________________ Megalodon Sorb and Sensors whilst in Australia www.divetub.com.au Diving & Photography @ www.uwphotog.com
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24th December 2006, 04:40	#7 (permalink)
silent running Mature mouth breather Current Rebreather/s: Prism Topaz Other Rebreather/s: Join Date: Jun 2005 Location: U.S.A. Brooklyn, New York Posts: 1,814	Re: Basic T piece makeup Jason, Chris's pix are good for understanding how the T pcs do their job. Incidentally, you can see from the Prism px that the ADV/dil add is right next to the inhale port, which gives you direct access to clean gas, it's the only CCR that has this placement. It's also the only one that places the manual O2 and dil add buttons in very different parts of the CLs-dil add up high right by inhale hose and O2 add down at the bottom and on the side of the exhale CL. Makes them hard to get mixed up in an emergencey. More excelent design...
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