TerryAllen
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Can anyone tell me where I can find suppliers, preferably in the Middle East, for breathing bellows to be used in my rebreather?
Breathing Bellows?
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MrConclusion
Contributor
Quoted from http://www.portup.com/~dfount/drfpascr.htm
McMaster-Carr sells a range of neoprene-coated nylon bellows ranging from 1 3/4" O.D. to 12" O.D. If I could find a suitable tube for the main housing (approximately 7" I.D.), I'd use the 6 3/4" O.D. X 5" I.D. bellows for the outer bellows. This would need to be about 9" long to give a maximum counterlung volume (my vital capacity) 4 liters. An inner bellows measuring 3" O.D. X 2" I.D. would give a discharge ratio of about 17%. An 8" X 6" outer bellows would allow a shorter counterlung (at about 6 1/2") and would give a choice of 3 1/2" X 2 1/2" or 3" X 2" inner bellows for a discharge ratio of 18% or 12%.
That's www.mcmaster.com
They're a very serious operation, and I'm almost sure that they either have international shipping, or can arrange it with a customs agent.
McMaster-Carr sells a range of neoprene-coated nylon bellows ranging from 1 3/4" O.D. to 12" O.D. If I could find a suitable tube for the main housing (approximately 7" I.D.), I'd use the 6 3/4" O.D. X 5" I.D. bellows for the outer bellows. This would need to be about 9" long to give a maximum counterlung volume (my vital capacity) 4 liters. An inner bellows measuring 3" O.D. X 2" I.D. would give a discharge ratio of about 17%. An 8" X 6" outer bellows would allow a shorter counterlung (at about 6 1/2") and would give a choice of 3 1/2" X 2 1/2" or 3" X 2" inner bellows for a discharge ratio of 18% or 12%.
That's www.mcmaster.com
They're a very serious operation, and I'm almost sure that they either have international shipping, or can arrange it with a customs agent.
O2BBubbleFree
Contributor
MrConclusion:
I remember reading several years ago (I think on the AARG site) a recommendation to stay away from neoprene in the loop, as it is too good a host for bacteria, and really hard to keep clean. Have you found this to be a problem?
Edit: I noticed that the next paragraph on the page you quoted states:
Dan's Rebreather Brainstorms:
MrConclusion
Contributor
3dent,
You are probably right. I am no expert on this, I just remembered seeing this *possible* source of *possibly acceptable* breathing bellows, and wanted to pass it along.
Maybe McMaster-Carr also has non-neoprene bellows? Perhaps if one could find out who the manufacturer of the neo-bellos is, then they might be able to special order some non-neo products?
I have no idea, but it was the only "starting point" I could think of. I am NOT recommending or condemning the use of these products - that's WAY outside my area of knowledge.
You are probably right. I am no expert on this, I just remembered seeing this *possible* source of *possibly acceptable* breathing bellows, and wanted to pass it along.
Maybe McMaster-Carr also has non-neoprene bellows? Perhaps if one could find out who the manufacturer of the neo-bellos is, then they might be able to special order some non-neo products?
I have no idea, but it was the only "starting point" I could think of. I am NOT recommending or condemning the use of these products - that's WAY outside my area of knowledge.
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