| 摘要 |
In the joinder of successive sections of pipe or casing, as in oil well applications, the quality of the joinder during makeup is measured by sensing actual bearing pressure. A deformation resistant member such as a chain having solely point contact engagement with the pipe collar includes a short sensor section deformable within its yield limits and is wrapped about the collar in the mid-region of its threaded portion. As the pipe is threaded into the collar, bearing forces exerted on the collar are measured by strain gauges in terms of the extension of the sensor section. The non-yielding character of the chain and its transverse span provide both an integration of the circumferential deformation within the band of interest and a substantial mechanical gain at the sensor section. Temperature sensors responsive to the temperatures of the collar, pipe and deformable section generate signals for circuits that are used to compensate for thermal effects, so that accurate readings are obtained under field conditions.
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