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Hate to be a heart breaker but might be onto the information im looking
for. Been talking to the engineers at work and one of which has a clue as to
where i might find the design specs
on a vacuum chamber they designed a few years back and the technical info
to be able to calculate hull thickness. As far as repairing frp and weeping
hulls, this sounds more like a poor construction using old polyester resins not
the epoxy vinyl ester that is commonly used on todays pressure vessels. OK
here is some insight on frp pipe, 24" dia. 3/4" wall frp pipe is rated for 100
psi internal pressure, test pressure is 150 psi, max test pressure is 225
psi.
There is a 10 x's safety margin on the pipe pressure and DOW claims their
resins achieve a 16 x's safety margin and yes they do take into consideration
constant pulsing and hammering of the pipe as well as temps of 180' and
chemicals that would eat your steel subs alive. (no offense to steel
lovers) For those that think frp will give them greater styling
advantages, this is only true for ambient subs shape will still play an
important role on a 1 ATM sub in frp. When i get the information for
calculating thickness for a vacuum chamber I will share it freely with
those that love composites.....
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