Abstract: To raise the inspecting level of crude oil metering at pump stations, it's necessary to allocateanother control system——a standard volume tube: Smith's Bidirectional Standard Volume Tube Contriol System, which had been left idle for years, was put into use for cost saving. The plant, even though part of its components had got rusted and no referencial information availabe. It became functioning again after being overhaulled, adjusted and tested based on the plan wiring obtained through investigation and study, field testing and records. Its standard volume has been up to 2 275.82 liters with the reproducibility of>0.02 percent defined in accordance with CNPC acceptance test and calibration done by Metering and Testing Research Institute, Liaoning Province. Both the sensitivity and reliability of the control system are found to meet the requirements of JJG 209-80 Inspection and Calibration Regulation.