The American School of Gas Measurement Technology (ASGMT) has been at the forefront of Flow Measurement training since its inception in 1966. Over the years, ASGMT has evolved to encompass comprehensive training in both gas and liquids measurement. With a commitment to excellence, ASGMT now offers an extensive curriculum comprising over 115 lecture classes, complemented by 48 Hands-On Product Training sessions led by industry experts.


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January 12, 2002

Throughout the oil and gas industry, there stems the need for accurate, economical measurement of process fluids. Orifice metering satisfies most flow measurement applications and is the most common flow meter in use today. The orifice meter, sometimes called the head loss flow meter, is chosen most frequently because of its long history of use in many applications, versatility, and low cost, as compared to other flow meter available. The orifice meter consists of a primary element and secondary element(s). The primary element includes a section of straight run pipe with a constrictive device, most commonly and orifice plate, which causes change in energy. The energy changes in the form of a loss in static pressure and increased velocity through the orifice. The secondary element senses the change in pressure, or differential pressure. This differential pressure combined with correction factors for the primary device and physical characteristics of the fluid being measured allows computation of rate of flow. Proven flow factors and established procedures convert the differential pressure into flow rate. These factors and/or coefficients are based on measurable dimensions of the primary device, such as the pipe inside diameter and the orifice bore diameter, along with the physical properties of the fluid being measured, such as specific gravity, density, and viscosity

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