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This is a multi-part message in MIME format. ------=_NextPart_000_0085_01C122BA.DDCDD480 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thom, I would suggest that cost is a pretty poor reason not to go to an iso = manifold. You can get the Sea Elite for only $169.96 from Divers Supply. = If you don't use a manifold you will need 2 SPGs which will be about = 1/2 the cost of the manifold. So you are only talking about $100 = difference. The advantage of the ISO manifold is that it will, in the case of a = regulator free flow, allow you to save and utilize your entire gas = supply by shutting down the offending post. In the case of a tank to = valve o-ring failure, you will be able to isolate 1/2 your gas and use = it. Independent doubles increase task loading significantly by requiring you = to switch back and forth between tanks every 300-500 psi so the pressure = remains balanced so in the event of a failure you still have somewhere = near half of your remaining gas in the other tank. It further = complicates matters when it comes to your long hose, which most use on = the reg that they pass off to their buddy for an OOA situation. Since = you are switching back and forth, long hose, short hose long hose short = hose, when your buddy has an OOA what do you give him, what's in your = mouth or what is parked????? Or do you use 2 long hoses???? If so how = do you store them??? In an OOA emergency this should be autonomic = response, not require a decision. Dave Dalton =20 ----- Original Message -----=20 From: Thom Hadfield=20 To: techdiver@aquanaut.com=20 Sent: Saturday, August 11, 2001 7:51 PM Subject: Doubles? Being new to tech diving and looking at different gear configurations = I have developed a question? If I go to doubles for deeper and longer = dives but do not use a manifold (cost) what are the major drawbacks? I = would assume the major draw back would be if the right tank and the left = reg went bad at the same time? not being to isoloate one tank off and = using a different reg? Would I assume this would be an acceptible risk = while diving with a buddy. Or are their other reasons that I am just not = seeing at the moment. Thom ------=_NextPart_000_0085_01C122BA.DDCDD480 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 5.50.4522.1800" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial>Thom,</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>I would suggest that cost is a pretty poor = reason not to=20 go to an iso manifold. You can get the Sea Elite for only $169.96 from = Divers=20 Supply. If you don't use a manifold you will need 2 SPGs which = will be=20 about 1/2 the cost of the manifold. So you are only talking about $100=20 difference.</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>The advantage of the ISO manifold is that it = will, in the=20 case of a regulator free flow, allow you to save and utilize your entire = gas=20 supply by shutting down the offending post. In the case of a tank to = valve=20 o-ring failure, you will be able to isolate 1/2 your gas and use=20 it.</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>Independent doubles increase task loading = significantly by=20 requiring you to switch back and forth between tanks every 300-500 psi=20 so the pressure remains balanced so in the event of a failure you = still=20 have somewhere near half of your remaining gas in the other tank. It = further=20 complicates matters when it comes to your long hose, which most use on = the reg=20 that they pass off to their buddy for an OOA situation. Since you = are=20 switching back and forth, long hose, short hose long hose short hose, = when your=20 buddy has an OOA what do you give him, what's in your mouth or what is=20 parked????? Or do you use 2 long hoses???? If so how do you store=20 them??? In an OOA emergency this should be autonomic = response, not=20 require a decision.</FONT></DIV> <DIV><FONT face=3DArial></FONT> </DIV> <DIV><FONT face=3DArial>Dave Dalton </FONT></DIV> <BLOCKQUOTE dir=3Dltr=20 style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV> <DIV=20 style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B>=20 <A title=3Dthom.hadfield@ho*.co* = href=3D"mailto:thom.hadfield@ho*.co*">Thom=20 Hadfield</A> </DIV> <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A = title=3Dtechdiver@aquanaut.com=20 href=3D"mailto:techdiver@aquanaut.com">techdiver@aquanaut.com</A> = </DIV> <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, August 11, 2001 = 7:51=20 PM</DIV> <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Doubles?</DIV> <DIV><BR></DIV> <DIV><FONT face=3DArial size=3D2>Being new to tech diving and looking = at different=20 gear configurations I have developed a question? If I go to doubles = for deeper=20 and longer dives but do not use a manifold (cost) what are the major=20 drawbacks? I would assume the major draw back would be if the right = tank and=20 the left reg went bad at the same time? not being to isoloate = one tank=20 off and using a different reg? Would I assume this would be an = acceptible risk=20 while diving with a buddy. Or are their other reasons that I am just = not=20 seeing at the moment.</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial = size=3D2>Thom</FONT></DIV></BLOCKQUOTE></BODY></HTML> ------=_NextPart_000_0085_01C122BA.DDCDD480-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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