Download PDF by S.S. Rahman and G.V. Chilingarian (Eds.): Casing Design Theory and Practice

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Extra resources for Casing Design Theory and Practice

Sample text

2) 29 where: cry - do - di - minimal yield strength, psi. nominal outside diameter of the pipe, in. inside diameter of the pipe, in. EXAMPLE 2-1" Calculate the pipe-body yield strength for 9g5 in. 472-in. Solution: The minimum yield strength for N-80 steel: cry - 80,000 psi The internal diameter, di" di - 9 . 681in. 57 in. 2 Therefore, from Eq. ,5 % of the gauge length of the specimen. 6 %. Joint strength is the minimal tensile force required to cause the joint to fail. Formulas used to compute the joint strength are based partly on theoretical considerations and partly on empirical observation.

EXAMPLE 2-1" Calculate the pipe-body yield strength for 9g5 in. 472-in. Solution: The minimum yield strength for N-80 steel: cry - 80,000 psi The internal diameter, di" di - 9 . 681in. 57 in. 2 Therefore, from Eq. ,5 % of the gauge length of the specimen. 6 %. Joint strength is the minimal tensile force required to cause the joint to fail. Formulas used to compute the joint strength are based partly on theoretical considerations and partly on empirical observation. For API Round thread, joint strength is defined as the smaller of miniInal joint fracture force and minimal joint pullout force.

Pin a i i d Ixm. of the casing. 7: Strengths of non-API steel grades. 1t imat c Non-AP I Grade S-80 Mod. 000 * * ~ ~ . i . S. 75 s q in. C'ircumfereiitial. + Longitudinal Maxiliial ultimate tensile strrngtli of ~ ' L O . O O O psi. -* at t h e same time providing pressure containment from both net internal and external pressures. Their ability to resist tension and contain pressure depends primarily on the type of threads cut on the coupling and at the pipe ends. \ \ 7 i t l i t h e exception of a growing number of propriet ary couplings.

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