Neck O-Rings leaking at 1200 psi?  Good thing I have a pony backup... 

Art.

	-----Original Message-----
	From:	Ingemar Lundgren
[SMTP:ingemar.lundgren@mb*.sw*.se*]
	Sent:	Tuesday, January 19, 1999 5:33 PM
	To:	Jim Cobb
	Cc:	Dave Grey; Wahoodiver@ao*.co*; artg@ec*.ne*;
Scaleworks@ao*.co*; Rubrifolia@ao*.co*; Wahoojan@ao*.co*; Tech Diver
	Subject:	Re: usefull pony bottles ( was which course&
school)



	Jim Cobb wrote:

	> This is when your tank fails catastrophically and blows you
into a
	> million pieces because you dared dive without a pony.
	>
	> Only kidding. The burst disk is a little disk of copper in
your valves
	> which is theoretically supposed to give way in the event of
	> overpressuring your tank via overfill or heat.
	>
	> In reality the disk flexes each time you fill your tank and
eventually
	> suffers a stress fracture causing all your air to depart in a
rapid
	> fashion.
	>
	> Personally I double-disk (stack two) because a burst disk at
the wrong
	> time during a deco dive could ruin your whole day.
	>
	> Europeans are lucky, due to the cool climate over there and
complete lack
	> of building fires, their valves don't need burst disks.
	>
	>

	Jim you are right burst disks are useless and dangerous.  The
fire department in
	Sweden have done tests on scuba tanks rated for 200bar (3000
psi). At 1200 bar
	(17000 psi)   they started to leak from the neck o-ring.  There
is no need for a
	burst disk what so ever.

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