Category Archives for Instrumentation

Turbine Flow Meters

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 bladed rotor or impeller suspended in the flow stream. Two basic assumptions are necessary to … Continue reading

13. June 2018 by Juan
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PD Meter – Installation

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 of the design criteria described in the standard are applicable in non-custody transfer measurements. Figure … Continue reading

13. June 2018 by Juan
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PD Meter – Options

• 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 arrangement is the preferable method for large facilities. For remote, stand-alone LACT units, the traditional … Continue reading

13. June 2018 by Juan
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PD Meter – Fluid Data

• 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 continuous and intermittent ratings. Commonly used engineering units are gallons per minute (GPM) and barrels … Continue reading

13. June 2018 by Juan
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PD Meter – Counter

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 degrade measurement accuracy and cause fatigue. • Register Type—Specifying a register on the meter that … Continue reading

13. June 2018 by Juan
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PD Meter Design

• 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 load rack) and service (continuous or intermittent) must be known. Use the space at the … Continue reading

13. June 2018 by Juan
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PD Meters Applications

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 used for crude oil, mid-weight and heavy distillates, lube oil and additives, and chemicals of … Continue reading

13. June 2018 by Juan
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Performance Characteristics of PD Meters

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 12:1, with a normal range of 10:1. Figure 500-25 shows the accuracy of a commonly … Continue reading

13. June 2018 by Juan
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Counter Drive Train PD Meters

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 coupling, and a calibrator. The gear ratio of the gear train is chosen to convert … Continue reading

13. June 2018 by Juan
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Internal Measuring Element PD Meter

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 pressure across the clearances. Thus there will always be some fluid that bypasses the measuring … Continue reading

13. June 2018 by Juan
Categories: Flow Measurement | Comments Off on Internal Measuring Element PD Meter

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