By S.S. Rahman and G.V. Chilingarian (Eds.)
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Extra info for Casing Design Theory and Practice
Internal pressure, psi. internal radius of casing, in. 5:3) 50 For small A0, s i n ( A 0 / 2 ) ~ A0/2, and Eq. 54) ri For a thin-walled cylinder with a high nominal diameter to thickness ratio and at equal to cry, the yield strength of the pipe material, Eq. 54 can be expressed as follows: 1 where: do - t - Pb -- outside diameter of the cylinder, in. cylinder wall thickness, in. burst pressure rating of the material, psi. 55 is identical to Barlow's formula for thick-walled pipe which is derived using the membrane theory for symmetrical containers.
As the thread height of a particular thread shape increases, the likelihood of jumpout failure decreases; however, the critical material thickness under the last engaged thread decreases. Lead" Lead is defined as the distance from one point oi1 the thread to the corresponding point on the adjacent thread and is measured parallel to the thread axis. Pitch Diameter: Pitch diameter is defined as the diameter of all imaginary cone that bisects each thread midway between its crest and root. Threaded casing connections are oft eii rat ed according to their joint efficiency and sealing characteristics.
Internal diameter of the box under the last perfect thread, in. ~2) Foj = ~ '4~ ( dpin ~ - d~) where" dji dpi,~ = internal diameter of the joint, in. external diameter of the pin under the last perfect thread, in. Details of the formulas used to compute joint strength are presented in API Bul. 5C2 (1987) and API Bul. 5C3 (1989). Axial tension results primarily from the weight of the casing string suspended below the casing hanger or below the joint of interest. Other tensional loads can arise due to bending, drag, shock load, and pressure testing of casing string.