Calculate Steel Pipe Thickness for Oil Transportation | Safety Factor 1.5

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Discussion Overview

The discussion revolves around calculating the minimum thickness of a steel pipe required for transporting oil, considering a specific yield stress and safety factor. It involves applying relevant equations and assessing the plausibility of the calculated thickness.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant presents a calculation for the minimum thickness of a steel pipe based on given parameters, resulting in a thickness of 4.2mm.
  • Another participant questions the plausibility of the calculated thickness, suggesting that it seems too small.
  • A participant raises a question about the formula used to calculate stress in the pipe wall, indicating a potential oversight in the approach.
  • One participant asserts that the formula specifies using the radius for calculations, implying that the initial approach may have been correct.

Areas of Agreement / Disagreement

The discussion contains multiple viewpoints regarding the calculation method and the appropriateness of the thickness result. There is no consensus on the correctness of the approach or the final thickness value.

Contextual Notes

Participants express uncertainty about the formula's application and whether the diameter or radius should be used in the calculations. There are unresolved questions about the stress calculation and its implications for the minimum thickness.

Who May Find This Useful

This discussion may be useful for students or professionals interested in engineering calculations related to pipe design, particularly in the context of fluid transportation and material strength considerations.

DylanW
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1. Homework Statement
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. Homework 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?
 
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Hey just a brainwave am I maybe supposed to use the diamater or circumference? Gives a more plausible seeming result
 
What formula are you using to calculate the stress in the pipe wall?
 
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?
 
If the formula says radius, you use the radius.
 

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