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Never had a failure The question of independents versus manifolded doubles seems to rise=20 repeatedly (but has importance for newcomers). Since there are seals at either end of the crossover bar and hopefully an= =20 isolation valve in the bar, in the event of a bar failure you close the=20 afore mentioned valve just as you would if a failure ocurred at a tank=20 valve. This presupposes the bar fail at only one end such as with a=20 blown o-ring. If you hit the bar hard enough to rupture both ends while=20 in the water then you are doing something that deserves to screw you like= =20 reckless scotering. Sam Frushour On Tue, 27 Aug 1996, Lars Hektor wrote: > Date: Tue, 27 Aug 1996 21:44:56 +-200 > From: Lars Hektor <swedish_deep@gl*.se*> > To: 'Techdiver' <techdiver@terra.net> > Subject: Dual manifold with isolator valve safe? >=20 > I have been giving the following question some thought.... >=20 > On a dual manifold with isolator valve. The tankpressure will always be o= n the cross-over bar, no matter which valve is being closed. What will happ= en in the event of a malfunction of the isolator valve that results in a le= ak or fast gas loss. As I can=20 see it, all gas will more ore less rapidly, be lost and there is nothing th= at can be done to prevent it. > Personally I=B4m using independent doubles instead of the dual manifold. = This will of course give an extra number of regulator switches and some add= ed gas management. But on the other hand you will not have to isolate any v= alve in the case of a freeflow,=20 certainly you will the loose the "side" that malfunctions, but it can never= effect the other, hopefully still working bottle. In combination with the = thirds rule and equalization (through regulator changes), I feel this is a = very safe system. I know that=20 a large number of very experienced divers are relying on the dual-manifol. = So my question is, how is this problem being addressed and secondly have an= yone had a malfunction as described above. >=20 > Regards, Lars > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. >=20
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