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1.12.1 General Requirements
1.12.1.1 Gas quality
The meter shall as a minimum requirement, operate with any of the normal range natural
gas composition mixtures specified in AGA Report No.8, this includes relative density
between 0.554 (pure methane) and 0.87.
1.12.1.2Temperature measurement
Coriolis flow meters should operate over a temperature range of –40 to 200F (-40 to 93C).
However, in extreme ambient environment, appropriate measures such as providing shade
to reduce impact of direct sunlight to the meter should be considered. A thermowell should
be installed upstream of the Coriolis sensor for temperature verification purposes
1.12.1.3 Pressure measurement
The location of the pressure measurement should be made near the sensor. The pressure
tap can be located either upstream of the sensor.
1.12.1.4 Vibration and Electrical noise
Coriolis meter package should be installed far away from vibration sources like
compressors, pumps, generators and electrical noise such as electromagnetic interference.
1.12.1.5 Piping Configuration
The following components should be provided in the piping design: Isolation block valves,
Pressure, blow down port and thermowell port. The pipe-works must be aligned and
properly supported to minimize stress due to pressure, weight and temperature.
1.12.1.6 Mounting
a. The sensor should be properly mounted, supported and aligned with the inlet and outlet
flanges. A spool piece should be used in place of the meter to align pipe-work during the
construction phase.
b. The Coriolis transmitter shall be mounted to ensure easy access to communication
equipment, displays and keypads. The Coriolis meter may have the transmitter mounted to
the sensor or mounted remotely.
1.12.2 Orientation
The sensor tubes should be positioned in such a way that the possibility of heavier
components, such as condensate, settling in the vibrating portion of the sensor is
minimized.
1.12.3 Minimum Performance Requirements
The following minimum performance requirements shall be met by the meter, as supplied
directly from the manufacturer, prior to making any calibration factor adjustments based
on an independent third-party flow calibration of the meter.
Repeatability:
+ 0.35% of reading for Qt < Qi < Qmax
+ 1.0% of reading for Qmin < Qi < Qt

Where
Qt is the transitional mass flow rate.