Cameron Scanner 3100 EFM - Measuring Natural Gas via a Differential Pressure Meter

Table 2.2—Industry Standards for Meter Installation
Meter Type Standard Description
Turbine
Meter
AGA 7, Section 7 Installation of gas turbine meters to include ow direction, meter orientation,
meter run connections, internal surfaces, temperature well location, pressure
tap location, and ow conditioning
Illustrations of recommended installation congurations
Environmental considerations, the use of other devices to improve meter
performance, and precautionary measures
This specication applies to axial-ow turbine ow meters for measurement
of natural gas, typically 2-in. and larger bore diameter, in which the entire gas
stream ows through the meter rotor.
API MPMS Chapter
21.1, Section 1.7
Installation of electronic gas measurement devices and associated
communications, gauge/impulse lines, and cabling
API MPMS Chapter
21.1, Section 1.8
Requirements for calibrating and verifying the accuracy of electronic gas
measurement devices
API MPMS 5,
Section 3
Description of unique installation requirements and performance
characteristics of turbine meters in liquid hydrocarbon service (This section
does not apply to the measurement of two-phase uids.)
ISO 5167, Part 1 Installation of orice plates inserted into a circular cross-section conduit
running full
Limitation of pipe size and Reynolds number
ISO 5167 is applicable only to ow that remains subsonic throughout the
measuring section and where the uid can be considered single-phase. It is
not applicable to the measurement of pulsating ow. It does not cover the use
of orice plates in pipe sizes less than 50 mm (2 in.) or more than 1,000 mm
(39 in.), or for pipe Reynolds numbers below 5,000.
Measuring Natural Gas via a Differential Pressure Meter
Best Practices
For best measurement accuracy, ensure that the meter run complies with the following AGA 3 and ISO 5167 guidelines,
as applicable:
• Do not place unit near vents or bleed holes that discharge corrosive vapors or gases.
• Consider the orientation of the meter run when determining the best position for mounting the Scanner 3100.
– If the Scanner 3100 is mounted to a horizontal pipeline, make sure process connections are at the top of the line,
and mount the Scanner 3100 above the pressure connections at the pipe.
– If the Scanner 3100 is mounted to a vertical pipeline, install the sensor above the differential pressure source
connections, or install a condensate (drip) pot to prevent the accumulation of liquid in interconnecting tubes.
Slope all tubing upward at least 1 in./LF to avoid liquid entrapment.
• Mount the Scanner 3100 as near level as possible such that the operator has a clear view of the LCD and can access
the keypad easily when the enclosure cover is removed. The location should be as free from vibration as possible.
• Ensure the high port of the sensor (marked H) is connected to the upstream side of the meter run.
• Flow should remain subsonic throughout the measuring section and should be single phase.
• Pipe diameters (D) should be between 2 in. (50 mm) and 39 in. (1,000 mm) per ISO 5167; or greater than 2 in. (50
mm) per AGA 3.
• Pipe Reynolds numbers must be above 5,000.
• d (orice diameter) must be greater than or equal to 0.45 in. (11.5 mm).
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Scanner 3100 EFM Section 2