huangyhg

pipe radial expansion due to internal pressure
i would like to calculate the increases in internal diameter and external diameter in a pipe full of water when the pipe is pressurized.
could anybody provide the formulas or advise where i can find them?
the ratio r/t is 8.625.
thanks
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the hoop stress will give you the change in length of the dianeter, which in turn gives the change in radius.
with r/t>5 hoop stress can be taken as pressure*radius/thickness
δr=pr2/et. you may want to think about thermal expansion/contraction as well.
depending on the details, there may be a minor correction for lengthwise effects as well.
if the pipe is out-of-round, it will tend to round up when pressurized.
hi philip54us
if your pipe wall is more than 1/10 of the radius which i suspect it is then you need to use thick walled cylinder theory see page 6 of this link titled "constitutive equations".
regards
desertfox
hi sorry
here's the link:-

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