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• # How can I calculate the overpressure?

Discussion in 'Calculations' started by robin72, Jun 23, 2010.

1. ### robin72Guest

Hi all,Could you tell me how I can calculate the overpressure in 2" pipe API 5L X52 which cause blown up of the pipe by 50%.

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3. ### ConnectUTSActive Member

Joined:
Sep 2009
Posts:
35
0
Re: how I can calculate the overpressure

Woodcousa.com has the technical information on API 5L X52 pipe

The materials properties are listed on http://www.woodcousa.com/line_pipe_properties.htm

The dimensional properties of the pipe are listed on http://www.woodcousa.com/pipe_schedule.htm

The hoop stresses in the pipe are given by the equation

s = pr/2t

p = internal pressure
t = wall thickness of pipe

The theoretical 150 percent burst pressure can then be calculated with s =150 percent of ultimate tensile strength

p = 2st/r

4. ### rushinpatelActive Member

Joined:
Apr 2011
Posts:
25
0
Re: how I can calculate the overpressure

there are two type of stress are produce in pipe due to over pressure in it,

(1) hoop stress
(2) longitudional stress

hoop stress(6h)=(pd/2t),

from above eqn.
we find internal pressure p=[(6h)*(2t)*]/[d]
where p=pressure inside the pipe(n/mm^2),
t=thick.of pipe(mm)
d=inside dia of pipe(mm),

longitudional stress(6h)=(pd/4t),

from above eqn.
we find internal pressure p=[(6h)*(4t)*]/[d]
where p=pressure inside the pipe(n/mm^2),
t=thick.of pipe(mm)
d=inside dia of pipe(mm),

but for safe design you go with longitudional stress and as per my thought it is safe design comperativaly hoop stress,