Performance improvement, renovation and application of RMG offtake and regulating device in gas transmission station

RMG512 self-operated monitoring regulator, a key offtake device, has been widely used in China's gas transmission pipeline offtake stations. With the promotion of "centralized monitoring" production management mode in stations, higher requirements have been proposed by the control center for remote control of offtake device, so as to ensure the "one run, one hot standby" of offtake and regulating skids. The diaphragm in the main valve of the monitoring regulator should not be subject to reverse differential pressure, which is easy to cause diaphragm damage in the hot standby mode of the pressure regulating skid. Analyzing the working principle of monitoring regulator, in combination with field operation experience, the scheme was proposed for the performance improvement and renovation of RMG regulating device: an impulse line with one-way continuity function can be introduced downstream of the operating regulator, and connected to the upstream of the monitoring regulator. In this way, it becomes possible to monitor the upstream pressure rise of the regulator with the downstream offtake pressure rise, without affecting the normal operation of the pressure regulating skid. The renovation scheme effectively reduce the operation loss of standby equipment, increase the service life of diaphragm, and has no effect on the working principle of monitoring regulator. Field test and application has demonstrated its nonpotential safety hazard, low renovation cost and considerable economic benefits.