- #1
DylanW
- 22
- 0
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?
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?