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  • How can I calculate the overpressure?

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

    1. robin72

      robin72 Guest

      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. ConnectUTS

      ConnectUTS Active Member

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      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
      r= inside radius of pipe
      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. rushinpatel

      rushinpatel Active Member

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      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,
       

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