GEWINDEVERBINDUNG VON ROHRENDABSCHNITTEN UND VERFAHREN ZU DEREN HERSTELLUNG

摘要

In an improved method of connecting threaded pipe sections to form a tubular joint (T) having proper sealing positioning at proper make-up torque, the resulting improved connection includes a first pipe section having a registry mark of a prescribed axial width at a predetermined axial position on its exterior surface, to assist in the proper axial engagement of a pin member of the first pipe section with a coupling or box member of the second pipe section. This position is principally determined from finite element analysis. This position is the same for all pin members of a similar size, grade, weight and thread form and therefore can be applied with a template. The pin member and box member are continuously threaded together up to a minimum of an empirically predetermined torque range. This torque range is predetermined by a combination of finite element analysis and experimentation of representative joints for a certain type, size, weight and grade of pipe section. If required, the range is adjusted by empirically determined friction factors to account for different platings, surface treatment and lubricants. While inexpensive, this improvement provides a simple method to visually determine on the rig floor or at the pipe rack whether the joint is properly made up to thereby provide effective sealing of the API (American Petroleum Institute) tapered threaded joint (T).