Paper: Fundamentals of liquid level controllers

Liquid level control is critical in the separation of gas, oil and water from the well stream. This is accomplished with the use of vessels designed to hold fluid long enough for this separation to take place. This is typically accomplished with the use of four different styles of controllers; mechanical, pneumatic, electronic and floatless. This paper will discuss the types of controllers, how they function, application for each and the different valves they operate.