How to calculate the pressure of 20# seamless steel pipe

When selecting seamless steel pipe, we need to conduct pressure test on seamless steel pipe to determine whether it is suitable for our own use. The pressure of seamless steel pipe can be calculated according to fixed formula. The following is an example:

DN = 10 mm, wall thickness = 3 mm, the tensile strength of the material is σ, the pressure is P, and the outer diameter of the pipe is D.

Pipe wall thickness δ= (P*D)/ (2*σ/S), S is the safety factor;
When P is less than 7 MPa, S = 8; when P is less than 17.5 MPa, S = 6; when P is greater than 17.5 MPa, S = 4.
We choose S = 6 for safety factor, and 410MPa for tensile strength of 20# seamless steel pipe,
Therefore, the pressure that the 20# seamless steel pipe can bear P= (2*σ/S*δ)/D =(2*410/6*3)/(10+6) =26.25MPa> set 17.5, so the safety factor S = 4.
Therefore, the pressure that 20# seamless steel pipe can bear P= (2*σ/S*δ)/D =(2*410/4*3)/(10+6) =39.375MPa.

According to this formula, you can easily calculate the pressure bearing capacity of various specifications of thick wall seamless steel pipe.