NOV Degasser Operation Manual

Document number Revision Page

M9251 5 15 of 56

Operation Operation 1. Turn the vacuum pump on. The vacuum created inside the vessel draws the fluid into the degasser just as a person draws soda into their mouth through a straw. The level in the vessel rises until the float valve depresses the three-way valve, and the vacuum pump draws suction from the atmosphere rather than the vessel. At this point, the vacuum in the degasser is just holding the fluid in the unit. 2. Open the centrifugal pump suction valve, close the pump discharge valve and start the pump. 3. Slowly open the centrifugal pump discharge valve until it is fully open. This supplies the needed pressure to the jet pump and pulls the degassed mud from the unit. Note: On units supplied with two (2) vacuum pumps, make sure that one of the pumps is isolated before turning on the other pump. Operating the degasser with both vacuum pumps will not lead to improved performance. Refer to drawing titled "DG-10 w/ Dual Vacuum Pump Assembly A20510 rev. 0" on page 44 for the vacuum pump flow diagram.

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