Liquid ring vacuum pump for degasser
There are two main reasons for the use of liquid ring vacuum pump in degasser. One is to suck the gas-invading mud from mud tank to the top of degasser to form a thin layer flow on baffle, cone or funnel. The other is to exhaust both the gas released from the degasser tank and the air entered. Vacuum pumps can also generate a pressure to discharge gas through a slender waste gas pipeline.
Start the liquid ring vacuum pump, working for a minute or two after the situation in the degasser tank. Both the inlet and outlet pipelines suck the mud to the same height. Before the mud in the inlet pipe rises enough to enter the top tip and begin to flow, the mud level in the vacuum tank will lift the floating ball to open the valve in the vacuum pipeline to prevent further increase of the vacuum. Therefore, it must be noted that the jet pump should be started at the same time or before starting the vacuum pump. In this way, the jet pump can keep the mud level in the vacuum tank low, keep the float ball in a proper position, keep the vacuum pump connected with the degassing tank, so that the vacuum in the tank can be increased enough to suck the mud from the inlet pipeline to the top compartment and start to flow.
It is very important to ensure that the float always works properly to prevent the mud level in the tank from rising and entering the vacuum pump through the pipeline. A dehydrator is installed on a vacuum pipeline. It is usually used to collect swallow vapor from hot mud and condense it into a liquid at its bottom. When the deaerator is turned off, water can be released. The upper part of the dehydrator is equipped with a float ball with a safety valve. If the water vapor condensation or the liquid level of the vacuum tank is too high to allow the mud to enter the dewaterer, the float ball will close the passage to the vacuum pump. When the safety valve on the upper part of the dehydrator leaks and the mud enters the vacuum pump, the cylinder block, piston ring and bearing will be grinded. If this happens, the vacuum pump must be dismantled and thoroughly cleaned. If the safety valve is stuck and open, a large amount of mud will flow through the safety valve, damaging the valve, piston and pull rod. The oil level will rise when the mud propeller enters the crankcase. This is also a sign that the valve has failed.