Cameron Scanner 3100 EFM - Measuring Natural Gas via a Turbine Meter; Remote Mount to a Turbine Meter

Measuring Natural Gas via a Turbine Meter
Best Practices
The Scanner 3100 calculates gas ow through a turbine meter in accordance with AGA 7 and API MPMS Chapter 21.1
industry standards. For optimum performance, ensure that the turbine and Scanner 3100 installation complies with the
industry recommendations listed below:
• Install the turbine owmeter in the meter run such that there are 10 nominal diameters of straight pipe upstream
and 5 nominal diameters of straight pipe downstream of the meter. Both inlet and outlet pipe should be of the same
nominal size as the meter.
• Straightening vanes are recommended for eliminating swirl conditions. If used, they should be installed 5 diameters
of straight pipe upstream of the meter.
• Where an RTD is used to facilitate compensated gas measurement from a gas turbine meter, locate the RTD within 5
diameters of straight pipe downstream of the meter outlet and upstream of any valve or ow restriction.
Remote Mount to a Turbine Meter
A Scanner 3100 can be mounted remotely and connected to a gas turbine meter for measuring gas in accordance with
AGA 7 calculations. Figure 2.11, page 42 shows an installation in which the pressure input is provided by the integral
MVT. The setup of the meter run and plumbing congurations can vary widely, depending upon the challenges existing
on location.
WARNING—HAZARDOUS AREA USE. The Scanner 3100 is certied for hazardous area use only when
installed in accordance with applicable standards and local wiring practices. Carefully review Hazardous
Area Precautions, page 27 to determine specic installation requirements (cable glands, conduit seals,
signal cable, RTD, etc.).
To connect the Scanner 3100 to a turbine meter, perform the following steps:
1. Verify that the owmeter and magnetic pickup are installed in the ow line.
2. Mount the Scanner 3100 to a 2-in. pipe using the mounting bosses on the side of the enclosure and a Cameron pole
mount kit. See Pole-Mounting the Scanner 3100, page 30 for detailed mounting instructions.
3. Bolt a 3-valve ange-by-NPT manifold (as recommended by Cameron) to the Scanner 3100 MVT sensor. Position
the manifold so that all valves are accessible from the front of the instrument.
4. Connect the pressure port of the turbine meter to either manifold process port with tubing. The unused pressure port
can be used as a “vent” as required. Always leave the equalizer valves open to allow pressure to both sides of the
MVT. Use a suitable compound or tape on all threaded process connections.
CAUTION Do not use Teon tape on the threads of the union, adapter, or pipe plugs that may be installed in
the enclosure. Use of Teon tape will void the explosion-proof rating of the instrument.
5. Remove the plug from the conduit opening in the top of the Scanner 3100 enclosure, route the turbine signal cable
through the opening, and connect it to the terminal board. A wiring diagram for the turbine input is provided in Fig-
ure 3.7, page 60. For hazardous areas, review Hazardous Area Precautions, page 27.
6. Install the RTD assembly in the thermowell. Remove the plug from the other conduit opening in the top of the Scan-
ner 3100 enclosure, route the RTD assembly cable through the conduit opening in the top of the Scanner 3100, and
connect it to the terminal board. A wiring diagram for the RTD assembly is provided in Figure 3.6, page 59. For
hazardous areas, review Hazardous Area Precautions, page 27.
7. Zero the static pressure and recalibrate, if required. See the Scanner 3100 Web Interface User Manual for complete
instructions. See also Zero Offset (Static Pressure or Differential Pressure), page 51, Differential Pressure Calibra-
tion and Verication, page 53, and Static Pressure Calibration and Verication, page 52.
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Scanner 3100 EFM Section 2