STAND FOR TESTING OF THREADED JOINTS OF OIL-GRADE DRILL PIPES Russian patent published in 1994 - IPC

FIELD: well drilling. SUBSTANCE: stand consists of two supports, hydraulic jack, screwed together pipes plugged at their ends, piping system and recording instruments. Supports are made in form of vertical plates connected to each other by, at least, two ties provided with means for changing intervals between plates. Each plate has two holes. Mechanism for producing axial load has hydraulic cylinder with extension and located between plates. Rod of bending mechanism has oval hole to receive extension. EFFECT: higher efficiency due to provision of testing drill pipes of various type-sizes and length with application of bending and tensioning forces simultaneously. 5 dwg