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Profile: Crown Oilfield Instrumentation specializes in the manufacture and service of drilling instrumentation. We design, develop, and build a full range of oil field instrumentation to meet the needs of the oil & gas industries. Tong line pull gauges are designed to indicate make-up or break-out torque for tool joints, drill collars, and drill string components, measuring in pounds of line pull. This system is used in applications where there are two or more sets of tongs being used with differing handle lengths. A 6” fluid-filled gauge reads the pounds of line pull from the tong handle. As the joints are made-up, the line pull is converted to hydraulic pressure within the cylinder, and sent to the gauge through the rubber hose. The gauge can then display this reading in measurements of line pull. The torque being applied can be determined by multiplying the gauge reading by the foot length of the tong handle.