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This is a multi-part message in MIME format. ------=_NextPart_000_0006_01BD0BC0.4FCB6CC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I can't recall who mentioned that normal welding O2 regs don't supply = enough pressure for surface supplied O2, but that statement is false.=20 (For surface supplied gas) To calculate the pressure to be delivered from the surface for any gas = you multiply your depth in feet by .445 and then for depths under 60 = feet you add 50 psi and anything over 60 feet you add 100 psi. So for = twenty feet you would need the line to be pressurized to about 60 psi, = the reg however loads to 90 - 110 psi so load it to that amount and you = will have plenty of O2 even if you decide to add 100psi instead of 50 = psi. With regards to using welding hoses, I would check first to ensure that = they do not contain Toluene in the rubber as a lot of rubber hoses do. = Toluene is leeched out of rubber hoses by air and can be toxic to a = diver. For surface supplied gases I use a floating commercial diving = hose called Aqualite which is good to -40 degrees celsius. The advantage = of a floating hose is that excess hose does not droop down deeper than = the diver affecting gas delivery or risking entanglement. You will find that a welding O2 reg that loads to 90 psi will deliver = enough gas to two resting decompressing divers at 20 feet. Richard Hayward HD Diving Services=20 23 Montgomery Avenue Sault Ste. Marie, Ontario, Canada P6B 1M4 Phone (705) 949-3431 Fax (705) 949-1580 ------=_NextPart_000_0006_01BD0BC0.4FCB6CC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> <HTML> <HEAD> <META content=3Dtext/html;charset=3Diso-8859-1 = http-equiv=3DContent-Type> <META content=3D'"MSHTML 4.71.1712.3"' name=3DGENERATOR> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT color=3D#000000 size=3D2>I can't recall who mentioned that = normal welding=20 O2 regs don't supply enough pressure for surface supplied O2, but that = statement=20 is false. </FONT></DIV> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV> <DIV><FONT color=3D#000000 size=3D2>(For surface supplied = gas)</FONT></DIV> <DIV><FONT color=3D#000000 size=3D2>To calculate the pressure to be = delivered from=20 the surface for any gas you multiply your depth in feet by .445 and then = for=20 depths under 60 feet you add 50 psi and anything over 60 feet you add = 100 psi.=20 So for twenty feet you would need the line to be pressurized to about 60 = psi,=20 the reg however loads to 90 - 110 psi so load it to that amount and you = will=20 have plenty of O2 even if you decide to add 100psi instead of 50=20 psi.</FONT></DIV> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV> <DIV><FONT color=3D#000000 size=3D2>With regards to using welding hoses, = I would=20 check first to ensure that they do not contain Toluene in the rubber as = a lot of=20 rubber hoses do. Toluene is leeched out of rubber hoses by air and can = be toxic=20 to a diver. For surface supplied gases I use a floating commercial = diving hose=20 called Aqualite which is good to -40 degrees celsius. The advantage of a = floating hose is that excess hose does not droop down deeper than the = diver=20 affecting gas delivery or risking entanglement.</FONT></DIV> <DIV> </DIV> <DIV><FONT color=3D#000000 size=3D2>You will find that a welding O2 reg = that loads=20 to 90 psi will deliver enough gas to two resting decompressing divers at = 20=20 feet.</FONT></DIV> <DIV><FONT color=3D#000000 size=3D2></FONT> </DIV> <DIV><FONT color=3D#000000 size=3D2>Richard Hayward</FONT></DIV> <DIV><FONT color=3D#000000 size=3D2>HD Diving Services </FONT></DIV> <DIV><FONT color=3D#000000 size=3D2>23 Montgomery Avenue</FONT></DIV> <DIV><FONT color=3D#000000 size=3D2>Sault Ste. Marie, Ontario, = Canada</FONT></DIV> <DIV><FONT color=3D#000000 size=3D2>P6B 1M4</FONT></DIV> <DIV><FONT color=3D#000000 size=3D2>Phone (705) 949-3431</FONT></DIV> <DIV><FONT color=3D#000000 size=3D2>Fax (705) = 949-1580</FONT></DIV></BODY></HTML> ------=_NextPart_000_0006_01BD0BC0.4FCB6CC0-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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