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Calculate pipe thickness

  1. Mar 25, 2013 #1
    1. The problem statement, all variables and given/known data
    A 1.2m diamater steel pipe carries oil of relative density 0.822 under a head of 70m of oil. What minimum thickness of 120MPa (yield stress) steel would be required for a safety factor of 1.5?

    2. Relevant equations
    Head = pressure/rho.g
    thickness = (safety factor.Pressure.radius.)/Tensile Strength

    3. The attempt at a solution
    Okay so I worked out pressure by Pressure = head x density x gravity = 563892 Pa
    Then I worked out the thickness by (1.5 x 562492 x 0.6)/120,000,000 = 0.0042 m = 4.2mm

    Seems a bit too small to me, could someone please tell me if this is plausible or if not where I have gone wrong?
  2. jcsd
  3. Mar 25, 2013 #2
    Hey just a brainwave am I maybe supposed to use the diamater or circumference? Gives a more plausible seeming result
  4. Mar 25, 2013 #3


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    What formula are you using to calculate the stress in the pipe wall?
  5. Mar 25, 2013 #4
    I didn't think that I needed to from the research I've done. The only formula I could find for minimum thickness is the one I posted above. Am I missing something?
  6. Mar 25, 2013 #5


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    If the formula says radius, you use the radius.
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