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Section 2 Scanner

2000 microEFM

Measuring Steam via a Differential Pressure Meter

Note This section contains installation guidelines for orice and cone meters. If installing the Scanner 2000

with an averaging pitot tube meter, refer to manufacturer instructions for installation.

Best Practices

The Scanner 2000 calculates steam ow in accordance with IF-97, AGA-3, and ISO-5167 industry standards.

For optimum performance, ensure that the installation complies with the following industry recommendations:

Condensate pots

• A condensate pot for a small-volume transducer like the Scanner 2000 MVT can be a simple pipe tee,

oriented so that one port extends downward (into the cold leg), the opposite port extends upward and is

closed by a pipe cap or blowdown valve, and the tee extends horizontally into the hot leg.

• The pots should be the highest point in the system.

• The pots should be mounted at the same level, and one or both should be adjustable vertically to remove

zero shifts in the differential pressure measurement.

Hot legs

• Hot legs should be large diameter (3/8 in. or 1/2 in., if possible)

• Hot legs should be as short as possible. If these sections must be more than 1 ft. in length, insulate them.

• Elbows and bends should not form any traps in which liquid can accumulate.

• Hot legs should be sloped along their entire length to allow liquids to drain back into the pipe.

Cold legs

• Cold legs should enter the multi-variable sensor through its side ports.

• Cold legs should be a minimum of 2 ft in length to allow proper convection cooling and should be run

horizontally with a slope of approximately 1 inch per foot to allow air bubbles to oat up into the pots.

• Elbows and bends should not form any traps for air bubbles.

• Cold legs should be lled with a suitable antifreeze. Dibutyl phthalate is recommended.

Antifreeze

• Dibutyl phthalate (DBP) has the following advantages over glycol antifreeze:

– DBP doesn’t mix with water, and so doesn’t become dilute over time; its specic gravity doesn’t shift.

– It is slightly denser than water, so it will stay in the pot permanently.

– It is non-ammable.

– It is much less toxic than glycol.

– It is available from industrial suppliers.

Valves

• Use only full-opening block valves that are rated for steam service.

• Use only blowdown valves that are rated for steam service. Periodic blowdowns are recommended for

preventing buildup of scale.

Cameron Scanner 2000 microEFM User Manual

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