Method of assembling a wear sleeve on a drill pipe assembly
US4171560A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1978 |
| Grant date | Oct 23, 1979 |
| Priority date | — |
| Expiry date | May 11, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49888
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A steel wear belt having a prepared inner surface with an inner diameter large enough to pass over the weld upset on one end of a drill pipe tube but too small to pass over the tool joints is installed about the pipe over a prepared outer peripheral surface thereof. The belt is installed prior to one or both tool joints being welded to the tube. The belt is secured to the tube by injection molding a mounting layer of high polymer material, e.g. plastics or elastomer, preferably self bonding and thermo-set, between the prepared surfaces. There is employed a diametrally split mold disposed about the belt and wedged together by tapered end rings. The rings have inner diameters large enough so they can be removed by passing over the tool joints if they are attached to the ends of the tube before securement of the wear belt. The pipe is plastics coated internally from tool joint to tool joint. The plastics of the internal coating and the polymer of the wear belt mounting are cured. Preferably both coating and mounting are cured simultaneously at the same cure cycle times and temperatures. To that tend the pipe coating and belt mounting may both be made of phenolic or epoxy, or preferabl…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.