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To transfer slurry( or mud) from drilling rig, there are various types pumps, normally we have centrifugal pump, screw pump, diaphragm pump, triplex mud pump, etc. 
There are a lot of kinds of centrifugal pump used for drilling mud system, there are horizontal centrifugal pump and vertical centrifugal pump, submersible slurry pump, water pump, etc.
Screw pump , especially single screw pump is used for feeding decanter centrifuge, it works stably than centrifugal pump, but the disadvantages are complicated maintenance, and it is easy to be damaged.
Triplex mud pump is used to transfer the mud to drilling mud system to the rig again for re-used, so it is high-pressure mud pump.
Diaphragm pump, also known as Pneumatic Diaphragm Pump, is a positive displacement pump used for drilling waste management.