Casing Burst Pressure Calculation

This article is one of 22 article which explain in detail the casing design calculations. Casing Burst Pressure Calculation is a major aspect in casing design calculations as the burst loads on the casing must be evaluated to ensure the internal yield resistance of the pipe is not exceeded. The burst load is the force applied by the fluid inside the casing which acts to rupture the pipe in the absence of external pressure. you can easily do your casing burst pressure table on excel sheet by using below equation.

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These loads are normally caused by mud hydrostatic pressure inside the casing and perhaps some surface pressure. Fluids on the outside of the casing, called back-up fluids, supply a hydrostatic pressure that helps resist pipe burst.

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The resulting effective burst pressure is the internal pipe pressure minus the external pressure.  Burst conditions are established and the least expensive pipe that will satisfy the burst pressure is tentatively selected.

The API Casing burst pressure Calculation

Casing Burst pressure calculation is given by simple equation:

Where:
Ym: is the minimum yield strength of the pipe
t : is the wall thickness in inches.
De: is the outer diameter in inches.

Example:

Calculate the burst rating for 7” 23# J-55 casing.

Solution: 

From Table 2, Ym for J-55 casing is 55,000 psi.  The ID of 7” 23# casing in 6.377”, therefore,

Casing burst pressure related papers

Burst Strength of Tubing and Casing Based on Twin Shear Unified Strength Theory

Abstract: Numerical and experimental comparisons show that the new burst strength model is much closer to the real burst values than that of other models. The research results provide an important reference to optimize the tubing and casing design of deep and ultra-deep wells