Cameron Scanner 2000 microEFM, Руководство пользователя по оборудованию

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Section 2 Scanner
®
2000 microEFM
Measuring Natural Gas via a Turbine Meter
Best Practices
The Scanner 2000 microEFM calculates gas flow through a turbine meter in accordance with AGA-7 and
API 21.1 industry standards. For optimum performance, ensure that the turbine and Scanner 2000 installation
complies with the industry recommendations listed below:
• Install the turbine flowmeter in the meter run such that there are 10 nominal pipe diameters upstream and
five nominal pipe diameters 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
five pipe diameters upstream of the meter.
• Where an RTD is used to facilitate compensated gas measurement from a gas turbine meter, locate the
RTD within five pipe diameters downstream of the meter outlet and upstream of any valve or flow restric -
tion.
Installation Procedure—Remote Mount to a Turbine Meter
A Scanner 2000 can be mounted remotely and connected to a gas turbine meter for measuring gas in
accordance with AGA-7 calculations. Figure 2.7, page 39 , shows an installation in which the pressure input
is provided by the integral MVT. Alternatively, if an optional expansion board is installed in the Scanner
2000, an external explosion-proof pressure transducer can be used to supply the pressure. See Installation
Procedure—Direct Mount to a Turbine Meter (CSA Compliant), page 40 , for more information.
The setup of the meter run and plumbing configurations can vary widely, depending upon the challenges
existing on location.
WARNING HAZARDOUS AREA USE. The Scanner 2000 is certified for hazardous area use only when
installed in accordance with applicable standards and local wiring practices. Carefully
review Hazardous Area Installations, page 27, to determine specific installation require -
ments (cable glands, conduit seals, signal cable, RTD, etc.).
To connect the Scanner 2000 to a turbine meter, perform the following steps:
1. Verify that the flowmeter and magnetic pickup are installed in the flow line.
2. Mount the Scanner 2000 to a 2-in. pipe or to a flat, vertical surface using bolts and the mounting holes in
the enclosure.
3. Bolt a 3-valve flange-by-NPT manifold (as recommended by Cameron) to the Scanner 2000 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 pres -
sure to both sides of the MVT. Use a suitable compound or tape on all threaded process connections.
CAUTION Do not use Teflon
®
tape on the threads of the union, adapter, or pipe plugs. Use of
Teflon
®
tape will void the explosion-proof rating of the instrument.