Hose Length

betti154 · 11th August 2008, 23:53

Hi,

For a while now I've hand this niggly issue with my mouthpiece hoses - they won't sit straight and rest on an angle. I've moved the weights more times than I can count, with some good hose days and some bad ones.

It finally dawned on my that the length of the inhale and exhale mouthpiece hoses was not equal. The inhale is about 10mm longer, which I believe is causing the issue.

Has anyone had a similar issue?

My thoughts are to trim down the inhale hose length to make it the same size as the exhale.

thanks, damien

Bazza · 12th August 2008, 00:51

A slack jaw could be the problem

Remember its a bit like a neck seal, happy trimming ... regards Baz

betti154 · 12th August 2008, 00:58

Baz,

I should probably ask if you have spare hose in stock before doing anything

It's probably best I don't respond to the slack jaw comment.

Let's just hope it is not like Nipper's seals!

damien

Bazza · 12th August 2008, 01:11

Damien .... just about to send my last length of hose off to NZ, another unhappy little snipper.

I am sure that we can help you out though ... once you stuff up

regards Baz .... PS Nipper has passion fingers, nothing to do with the SXD Thermal Centre of Excellence.

ScubaAl · 12th August 2008, 01:58

I have been having the same problem, but trimming the hoses would be a last resort. On mind the left side of the mouth piece always seems to be higher and in fact makes it difficult to see my wrist unit.
I have turned the hoses where they screw together with some success. I also believe I have read that turning the T pieces outward helps.
I'll be following this thread with much interest, would be great to find a solution.
Al

zzzzzzzz · 12th August 2008, 02:25

Hi there,

This is an impossible task because there is never the same amount of water in the exhalation hose. With percolation, workload, breathing rate, attitude, it is impossible to balance.

The only way to get any balance is to extract the water aft of the exhale flapper where it tends to pool. Alas, this type of solution is not currently the wisdom sought by Rebreather divers.

The preferred technique is to endure the side effects and accumulation in the loop with the crazy gyrations needed to expunge it from the loop. Yes, it is medievalism.

My pump extracts it from this point. It is astounding how variable the water accumulation is.

Good luck balancing a dynamic process with static solutions. This is like doing the same thing and expecting different results.

Best,

betti154 · 26th August 2008, 23:30

ScubaAl,

I've tried (with some success) the measures you describe. Both go in the right direction, but tiny adjustments and I think I need a sledge hammer.

I threw caution to the wind and trimmed two segments off the inhale hose. This has the net result of making the hose 10mm shorter, making it 3m shorter than the other hose.

I've only done the one dive since the "adjustment", and believe I've improved the situation by 50%.

It was suggested to me that my jaw bight may be wonky, and that may the cause. This is an interesting point, and something I hope my dentist can confirm the next time I go under the drill.

ZZZZZZZZ, I'm not sure I follow your argument. Ttis might be applicable to other divers/units, but I find that I get very little water/drool in the exhale counterlung. Anything that does get in there is promptly flushed to the exhale counterlung.

regards, damien

rewrites · 27th August 2008, 11:26

The Inspo mouthpiece hoses are a nightmare for this. It has little to do with collar weight positioning or trimming the hose in my expeience. Incidentally, don't trim too much as it can affect your side-to-side head turning.

As an experiment, take off your mouthpiece loop and hold the ends in your hands so that the loop hangs in front of you with the mouthpiece facing upards. If you turn one wrist slightly, you will see instantly how much this twists the loop. Hence, connecting the loop collars to the counterlung T-pieces aligned is essential.

I find the best way is to hold the loop as above then put a small twist in BOTH sides of the loop using both hands so the mouthpiece is turned slightly toward your body (will have a natural upward inclination once connected and in your mouth). Then, connect to the T-pieces being careful to keep the same position. You can mark these positions, but I find these are still liable to change.

If in the water they are twisted, one trick is to twist the first hose collars - the oines which hold the hose locking threads - to achieve the same result. HOWEVER, be careful this does not loosen the locking threads as the loop could allow water in.

As mentioned by others, turning the T-pieces away from you can also help a lot.

Hope this helps.

11th August 2008, 23:53	#1 (permalink)
betti154 New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Sep 2006 Location: Sydney Posts: 67	Hose Length Hi, For a while now I've hand this niggly issue with my mouthpiece hoses - they won't sit straight and rest on an angle. I've moved the weights more times than I can count, with some good hose days and some bad ones. It finally dawned on my that the length of the inhale and exhale mouthpiece hoses was not equal. The inhale is about 10mm longer, which I believe is causing the issue. Has anyone had a similar issue? My thoughts are to trim down the inhale hose length to make it the same size as the exhale. thanks, damien __________________ Damien Siviero http://damiensivero.com
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12th August 2008, 00:51	#2 (permalink)
Bazza New Member Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution rEvo Other CCR Dolphin Other Rebreather/s: Prism Topaz Sport Kiss Classic Kiss MK 15.X rEvo Other CCR Dolphin Join Date: Feb 2005 Location: Australia Posts: 174	Re: Hose Length A slack jaw could be the problem Remember its a bit like a neck seal, happy trimming ... regards Baz
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12th August 2008, 00:58	#3 (permalink)
betti154 New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Sep 2006 Location: Sydney Posts: 67	Re: Hose Length Baz, I should probably ask if you have spare hose in stock before doing anything It's probably best I don't respond to the slack jaw comment. Let's just hope it is not like Nipper's seals! damien __________________ Damien Siviero http://damiensivero.com
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12th August 2008, 01:11	#4 (permalink)
Bazza New Member Current Rebreather/s: Inspiration Classic Inspiration Vision Evolution rEvo Other CCR Dolphin Other Rebreather/s: Prism Topaz Sport Kiss Classic Kiss MK 15.X rEvo Other CCR Dolphin Join Date: Feb 2005 Location: Australia Posts: 174	Re: Hose Length Damien .... just about to send my last length of hose off to NZ, another unhappy little snipper. I am sure that we can help you out though ... once you stuff up regards Baz .... PS Nipper has passion fingers, nothing to do with the SXD Thermal Centre of Excellence.
(Offline)

12th August 2008, 01:58	#5 (permalink)
ScubaAl RBW Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss Join Date: Feb 2007 Location: Bloomington, Minnesota Posts: 52	Re: Hose Length I have been having the same problem, but trimming the hoses would be a last resort. On mind the left side of the mouth piece always seems to be higher and in fact makes it difficult to see my wrist unit. I have turned the hoses where they screw together with some success. I also believe I have read that turning the T pieces outward helps. I'll be following this thread with much interest, would be great to find a solution. Al
(Online)

12th August 2008, 02:25	#6 (permalink)
zzzzzzzz RBW Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Dec 2006 Location: Earth Posts: 120	Re: Hose Length Hi there, This is an impossible task because there is never the same amount of water in the exhalation hose. With percolation, workload, breathing rate, attitude, it is impossible to balance. The only way to get any balance is to extract the water aft of the exhale flapper where it tends to pool. Alas, this type of solution is not currently the wisdom sought by Rebreather divers. The preferred technique is to endure the side effects and accumulation in the loop with the crazy gyrations needed to expunge it from the loop. Yes, it is medievalism. My pump extracts it from this point. It is astounding how variable the water accumulation is. Good luck balancing a dynamic process with static solutions. This is like doing the same thing and expecting different results. Best, __________________ z
(Offline)

26th August 2008, 23:30	#7 (permalink)
betti154 New Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Join Date: Sep 2006 Location: Sydney Posts: 67	Re: Hose Length ScubaAl, I've tried (with some success) the measures you describe. Both go in the right direction, but tiny adjustments and I think I need a sledge hammer. I threw caution to the wind and trimmed two segments off the inhale hose. This has the net result of making the hose 10mm shorter, making it 3m shorter than the other hose. I've only done the one dive since the "adjustment", and believe I've improved the situation by 50%. It was suggested to me that my jaw bight may be wonky, and that may the cause. This is an interesting point, and something I hope my dentist can confirm the next time I go under the drill. ZZZZZZZZ, I'm not sure I follow your argument. Ttis might be applicable to other divers/units, but I find that I get very little water/drool in the exhale counterlung. Anything that does get in there is promptly flushed to the exhale counterlung. regards, damien __________________ Damien Siviero http://damiensivero.com
(Offline)

27th August 2008, 11:26	#8 (permalink)
rewrites RBW Member Current Rebreather/s: Inspiration Vision Other Rebreather/s: Inspiration Classic Inspiration Vision Evolution Join Date: Sep 2005 Location: Cornwall, UK Posts: 91	Re: Hose Length The Inspo mouthpiece hoses are a nightmare for this. It has little to do with collar weight positioning or trimming the hose in my expeience. Incidentally, don't trim too much as it can affect your side-to-side head turning. As an experiment, take off your mouthpiece loop and hold the ends in your hands so that the loop hangs in front of you with the mouthpiece facing upards. If you turn one wrist slightly, you will see instantly how much this twists the loop. Hence, connecting the loop collars to the counterlung T-pieces aligned is essential. I find the best way is to hold the loop as above then put a small twist in BOTH sides of the loop using both hands so the mouthpiece is turned slightly toward your body (will have a natural upward inclination once connected and in your mouth). Then, connect to the T-pieces being careful to keep the same position. You can mark these positions, but I find these are still liable to change. If in the water they are twisted, one trick is to twist the first hose collars - the oines which hold the hose locking threads - to achieve the same result. HOWEVER, be careful this does not loosen the locking threads as the loop could allow water in. As mentioned by others, turning the T-pieces away from you can also help a lot. Hope this helps. __________________ Always running with scissors ~8~ Last edited by rewrites : 27th August 2008 at 11:29.
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