I am trying to get some rough calculations. We are trying to calculate the pressures on a PVC pipe that is 12" in diameter, 300 ft. underwater.
I know that at ground level we have 14.7 psi.
Every 10 meters down, you double that.
Essentially, at 300 feet below, you experience about 148 psi. of pressure pushing inwards in every direction.
Now this changes because a PVC pipe is a cylinder, basically an infinite arch. PVC pipes have pressure ratings but they are inward forcing outward, I am trying to calculate the other direction.
We are still trying to find out what kind of pipe we need when it comes to technical dimensions, (Material, temperatures, water tight, inner wall thickness, etc.)
Here are a couple calculations
Tensile Strength, psi @ 73°F 7,450 ASTM D638
Tensile Modulus of Elasticity, psi @ 73°F 420,000 ASTM D638
Flexural Strength, psi @ 73°F 14,450 ASTM D790
Compressive Strength, psi @ 73°F 9,600 ASTM D695
Izod Impact, notched ft-lb/in @ 73°F 0.75 ASTM D256
I should be able to calculate the failure point using the above and the dims of the pipe (12.75" OD, .187" average wall thickness for 12" duct pipe.) CL100 in 12" has a typical wall thickness of .311".