Unlike positive displacement (PD) meters, turbine meters are inferential-type meters that infer volumetric flow rate from the measurement of rotational movement (angular velocity) of a…

The API Manual of Petroleum Measurement Standards, Chapter 5, Section 2, provides a standard for a liquid PD meter system for custody transfer measurement. Some…

• Temperature Compensator—Temperature compensation (to provide standard volume) can be achieved by using a temperature sensor (e.g., RTD), a temperature transmitter, and a computer. This…

• Minimum and Maximum Flow Rate—Specification of the minimum flow rate is a requirement for meeting the specified linearity. Maximum flow rate is based on…

When specifying counter components, do not put excessive weight on the meter and piping. Stress due to excessive load on the meter and piping may…

• Service—The type of liquid(s) and the nature and approximate amount of abrasives and corrosives must be specified. The application (process, custody transfer, pipeline, or…

Applications for various types of PD meters are as follows. Rotary vane. The rotary vane PD meter is the most common design. It is widely…

PD meters can achieve better than ± 0.05% repeatability accuracy. Linearities of ± 0.15% to ± 0.5% are typical over flow ranges of 8:1 to…

A typical counter drive train is shown in Figure 500-24. The counter drive train consists of a gear train, a rotary shaft seal or magnetic…

Six types of internal measuring elements (Figure 500-23) are in general use. All PD meters have some clearances between moving and stationary surfaces, with differential…