Burst disks, in my view, try to correct a non-existing problem, thus adding another failure point and no benefits. As mentioned, if you expose a tank to a fire the O-ring goes long before the tank explodes. European tanks are not equipped with burst disks and we don't exactly miss them. Doubling the burst disk may correct the problem, but it doesn't address the issue directly. US and Canada, please convince your authorities that burst disks are obsolete and get rid of them! You may say J-valves are a misconceived safety precaution but this is even less useful. With most issues there's a trade-off between benefits and disadvantages -- in this case there are no practical benefits whatsoever! regards, Hans -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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