When China National Petroleum needed reliable level measurement of their oil field mud tanks, they turned to Flowline. Mud tanks collect and separate solid materials such as sand and other aggregates from drilling fluids. These rectangular metal tanks have agitated compartments that precipitate solids from fluid as it passes from one compartment to the next. The tanks fill quickly and are susceptible to clogging. Rig operators stand on top of them and use high power water hoses to blast material blockages, and level measurement is critical to alert them of problems before they become spills. CNP required intrinsically safe, non-contact level measurement due to the coating nature of fluid, coupled with the presence of methane gas. For this reason, Flowline suggested the use of our EchoTouch ultrasonic level sensor installed over each mud tank compartment in a mobile stand. Hundreds of ultrasonic sensors provide reliable level data to the SCADA, which in turn, controls the tank process and alarms. Flowline is reliable level measurement.