Pumps: Rotary Positive Displacement Types

Describe the general operation of a progressive cavity pump. Describe the general operation of a two-screw pump. Describe the general operation of an external gear pump and an internal gear pump. Describe the general operation of a lobe pump. Describe the general operation of a sliding vane pump and a flexible vane pump. Describe the general operation of a tubing pump. Describe procedures involved in starting up a rotary positive displacement pump. Describe procedures involved in shutting down a rotary positive displacement pump. Explain the purpose of a relief valve.