Yawana Dive
Regular Diver
Diving the Solomon Islands
Posts: 45
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Post by Yawana Dive on Jun 12, 2021 11:09:20 GMT -8
Thanks snark3 That kinda confirms what I’ve got on mine.
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Post by nikeajax on Jun 12, 2021 11:28:23 GMT -8
Andrew, I wouldn't suggest anything that wasn't safe! JB
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Post by SeaRat on Jun 12, 2021 11:32:07 GMT -8
OK guys as promised I put my Hydro Twin I on some tanks today. Tank 1 2200 PSI - IP 105 Tank 2 1300 PSI - IP 130 Tank 3 200 PSI - IP 160 As you can see from the swing, you should set the IP at about 500 psig tank pressure, so that it breaths well at low tank pressure. Too high with a tilt valve will cause it to be a bit harder to breathe. John
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Yawana Dive
Regular Diver
Diving the Solomon Islands
Posts: 45
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Post by Yawana Dive on Jun 12, 2021 11:35:39 GMT -8
Oh, I’m sure of that JB! I just didn’t want to lose or damage something. Out here in the wilderness it’s so damn hard to replace stuff.
And these diaphragm regs are an unfamiliar beast to me. I have more experience with piston regs, the logic of which makes far more sense to me.
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Post by nikeajax on Jun 12, 2021 11:40:48 GMT -8
OK guys as promised I put my Hydro Twin I on some tanks today. Tank 1 2200 PSI - IP 105 Tank 2 1300 PSI - IP 130 Tank 3 200 PSI - IP 160 As you can see from the swing, you should set the IP at about 500 psig tank pressure, so that it breaths well at low tank pressure. Too high with a tilt valve will cause it to be a bit harder to breathe. John Tank pressure @ 500-PSIG, not IP, I hope! Yer likely to get a BANG outta things! JB
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Post by SeaRat on Jun 12, 2021 16:57:54 GMT -8
Oh, I’m sure of that JB! I just didn’t want to lose or damage something. Out here in the wilderness it’s so damn hard to replace stuff. And these diaphragm regs are an unfamiliar beast to me. I have more experience with piston regs, the logic of which makes far more sense to me. To really understand vintage diving regulators, you need to understand the diphragm regulators. That is the original design of the Cousteau-Gagnan regulator's first stage, unbalanced diaphragm. Fred Roberts, in his book, Basic Scuba, said it best. Here's his description of diaphragm regulators, first unbalanced, then balanced. Diaphragm 1st Stage Roberts by John Ratliff, on Flickr Diaphragm 1st Stage 002 by John Ratliff, on Flickr The last sentence is on the next page, and so here it is: "...chamber and the pressure affected side of the diaphragm, regardless of configuration." John
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