[PSUBS-MAILIST] Fiberglass Hull

[djackson99@aol.com]

I know  it's an old  topic but I have mostly ignored the previous post regarding fiberglass because I never thought I was going to give it a second thought.  ...wrong again.

1) Did anyone ever come up with a way to calculate even a ball-park working depth given all, or at lease some of the variables for fiberglass construction?  If so can you point me in that direction?

2) I know that the externally loaded working psi for a non-reinforced cylinder is lower than  it's internal working psi.  That makes even more scene to me when thinking about the alignment and tensile strength of glass or carbon fibers compared to their compression strength.  However it seems that there would be a ratio that could be used to estimate the reduction in loading ability.  Would that be true?  For example if pipe section is rated for 1000psi, could it's external load psi rating be stated as x% lower, say 20% lower, based on the type of material?

Thanks --Doug J

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