I stick to max 80psi which has a good safety factor vs the pipe rating
(4" @220psi in my launcher). Very cold weather and knocking it around
when brittle or anytime is certainly to be avoided. An alternative is
to buy schedule 80, McMaster sells sch 80 PVC in 5 foot lengths. The
pressure rating for 3" is 370psi and 4" 320psi. Then the end fittings
should also be sch 80.
A friend once (young = stupid) made a firecracker out PVC pipe. Note
that PVC doesn't show on xrays, so small bits were still erupting from
his skin 20 years later. Fortunately no eye damage.
Grant KZ1W
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