Positive-Displacement Meters.

A positive displacement meter, regardless of specific type, consists of two primary elements: a stationary case and a mobile element, which acts to isolate within the case fixed volume of fluid each cycle of operation. Technical Data used in the field explained in diploma in petroleum technology.   The mobile element may be a rotor with sliding vanes, rotatable vanes, or rotatable buckets. It may be two rotors that mesh somewhat similarly to two helical or cycloid gears as they rotate. The mobile element may be a disk that notates about a carlike follower in three-dimensional motion or a cylinder that oscillates about a cam follower in two-dimensional motion. Or, finally, the mobile element could be a conventional piston such as that found in a power pump.

Most positive-displacement meters are, in fact, closely akin to positive-displacement pumps. Positive-displacement meters rapidly became the standard for ACT use. The positive-displacement meter provided a less costly and less complex facility than the positive-volume meter. In addition, the positive displacement meter provides a means to drive samplers and/or net oil computers with signals on a small increment of volume that is more compatible with automatic qualitative measurement requirements. Some more details of diploma in petroleum technology are as under.

Care must be exercised in the installation design for a  positive-displacement meter. All free gas must be removed upstream to avoid spinning the meter, which would cause erroneous readings and, possibly, damage to the meter. For greatest accuracy, a constant flow rate should be maintained through the meter and at a rate at least 15% or greater of the rated capacity of the meter. Standards for calibration frequency, methods, etc., are set forth in API Std. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join diploma in petroleum technology