Stud Tensioners

Tensioners for pre-stressing big studs

KMT's McCartney Hydraulic Stud Tensioners extend the performance of large studs, such as those used on hyper compressor cylinders and large block valves, by pre-stressing. Tensioners can be supplied for 32mm / 1.25” and larger, providing tensioning forces up to 124,700 kg (275,000 lbs.).

The Stud Tensioner Unit is self-contained and portable, needing only plant air of 6.9 BarG / 100 PSIG. A simple push button controls the flow of plant air to a one or two stage diaphragm pump, which in turn supplies hydraulic fluid to each of the tensioning heads. Hydraulic pressures of up to 12,000 PSIG (827 BarG) is adequate to torque even the largest stud bolts. Custom “dial indicators” monitor stud stretch, insuring precise results. A small 1-gallon (3.8 l) hydraulic reservoir located along side the diaphragm pump provides for flooded suction. Each tensioning head is supplied with a hydraulic hose of adequate length for easy positioning.

Large air and hydraulic pressure gages provide easy monitoring of each tensioner cylinder while a hydraulic relief valve insures safe operation.