Strength in slotted pipe

[odi]

We have a 7" 32# 13% Cr L-80 casing that we want to cut slots into. The dimentions of the slots will be :
Width: 1,5 mm - 4 mm
Length: 63 mm

My question is, many slots pr. ft could I make to keep the same compression and tensile strength in this casing joint?

Have someone out there done calculations for such?

Thanks
Odi

 

[John3p]

With steel, yield strength in compression and tension will be virtually equal. The strength of the pipe itself is a function of the material's yield strength and the pipe's cross sectional area (assuming straight, constant diameter pipe). If you reduce the area in any way (i.e. decreasing wall thickness or removing sections) then the stress will increase inversely. This is fundamental to measuring strengths and stresses: Force per unit area (psi = pounds per square inch). Reduce the "square inch" and you reduce the "pounds" of force the material can withstand without yielding. A well defined problem is half solved.

 

[John3p]

I got so wrapped up in the fundamentals that I failed to address your question:

>My question is, many slots pr. ft could I make to keep the >same compression and tensile strength in this casing joint?

Answer: It is impossible to remove portions of the pipe and keep the same tensile strength.

Additionally, my comment about compressive and tensile strengths being equal applies only when the geometries are the same. A well defined problem is half solved.