Liquid-Level Controls

Another automatic safety-control device, which also frequently performs an operational-control function, is a liquid-level controller. Technical Data used in the field explained in diploma in petroleum technology.  These devices commonly are used to control liquid levels in separators, heater theaters, storage tanks, surge tanks, accumulator vessels, metering vessels, etc. They may be used (1) to control high liquid levels to prevent running over a vessel, (2) to control low liquid levels to maintain pump submergence, (3) to control intermediate operational levels to open and close dump valves, to start and stop pumps, etc., or (4) to maintain the interface of two liquids at a given level.

There arc many types of liquid level controls. Some of the more common types of level control devices used in production equipment are float operated, pressure operated, ground-level tank gauges, electric and/or electronic, sonic, and vibration. A float-operated level switch generally consists of a spherical or cylindrical float attached to one end of a mechanical lever with either an electrical switch or a pneumatic relay on the other end. The switch or relay is located in a separate portion of the device housing and is isolated from the float area with a pressure seal. The float is displaced by the rise and/or fall of the liquid level being controlled and the motion is transmitted through the pressure seal to activate the switch/relay. A pressure level control switch may control liquid level on the basis of either differential or static pressure. The differential type devices commonly are used as a form of “pilot operated” dump valves on pressure vessels. The static pressure devices frequently are used for well shut-down service and level control in tanks Some more details of diploma in petroleum technology are as under.

 Other types of level controls are available for specific installation needs. Level controllers should be selected to provide the required function in the least complex and most reliable form. It is advantageous to select equipment that has demonstrated satisfactory application experience within the operating environment that is to be controlled. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join diploma in petroleum engineering.