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from pvho-1
for a standard round flat viewport
thickness greater than or equal to .5
inch
t/dia greater than or equal .125
design pressure * cf of six = critical
pressure
do= dia outside
di=dia inside of seat
do/di >or = 1.25 for a 1000 ft depth design the t/di greater than or
equal to.25 ie a two inch thick view port will have a max di of 8 and and be 10
inch do
for a 500 ft depth design the t/di greater
than or equal to.195 ie a two inch thick view port will have a max di
of 10.25 and and be 13 inch do
for a 250 ft depth design the t/di greater
than or equal to.165 ie a two inch thick view port will have a max di
of 12.12 and and be 15.15 inch do
i hope that this helps
rick m |