1. Screw pump parking
When the screw pump parking, should first close the discharge valve, and to stop the pump completely closed after the closure of the suspension valve.
Screw pump because of the greater length of the operating screw, the rigidity is poor, easy to cause the twists and turns, the formation of abnormal operation. It is necessary to connect to the shaft of the system; the best job is in the installation of the device, to avoid the formation of deformation of the pipeline; convergence line should be independent of the fixed, as far as possible to reduce the involvement of the pump and so on. In addition, the spare screw, in the retention of the best way to use the suspension, to avoid the formation of uneven placement.
2. Screw pump starting
Screw pump should be in the suction and exhaust valve fully open to prevent overload or suction.
Although the screw pump with dry absorption capacity, but it is necessary to avoid dry turn, avoid scratching the surface.
Start pump hypothesis requires the oil temperature is low or high viscosity, the screw pump should be in the suction valve and bypass valve in the fully open starting and allow the pump to start when the minimum load until the original motivation to reach the rated rotate speed, the bypass valve gradually closed.
When open the bypass valve, the liquid is under the throttle in the pump continuous cyclic activity, circulation and more fuel, cycle time is longer, liquid heating is also more and more serious and the pump for high temperature deformation and damage, it is necessary to attract attention.
3. Screw pump operation
Screw pump is necessary according to the established direction of operation, in order to produce a certain suction and discharge.
Pump operation, should pay attention to check the pressure, temperature and mechanical seal work. On the seal should be allowed to have trace amounts of leakage, such as leakage does not exceed 20-30 seconds / drop to normal. Assuming that the screw pump in operation noise. This is often because the temperature is too low, the oil viscosity is too high, the oil into the air, or pump coupling loss excessive wear factors.
Accurate operation ability to ensure lasting mechanical life, any machine are unable to accept overheating, remember screw pump such as the overheat will immediately suspend the operation, to avoid the formation of loss.
