Sensia 3300 EFM, Installation, Operation & Maintenance Manual

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3. Mount a set of pipe tees (which serve as condensate pots) typically on either side of the MVT at an elevation above
the process connections of the MVT (for proper drainage). They should be a considerable distance (4 ft) from the
sensor ports, but as close as possible to the pressure taps on the meter.
4. Install a pipe cap or a blowdown valve that is rated for steam service at the top of each pipe tee. A blowdown valve is
recommended when the steam passing through the meter is known to be dirty.
5. Install tubing and fittings to connect the high-pressure and low-pressure taps of the DP meter to the pipe tees. This
section is typically referred to as the hot legs of the installation, as this section of tubing encounters steam at its
highest temperature. Install a shut-off valve near the high and low ports of the DP meter. Use a suitable compound or
tape on all threaded process connections.
Note: To prevent fittings from turning and/or to avoid putting tension on stainless steel tubing, use a backup wrench to
attach stainless steel tubing to shut-off valves, or sensor ports.
CAUTION Whenever possible, locate the hot legs of a steam installation behind the MVT safely out of the
operator’s normal reach. This will help prevent accidental burns.
7. Install tubing to connect the high-pressure and low-pressure process connections of the block manifold to the pipe
tees installed in step 3. This tubing section is typically referred to as the
cold legs
of the installation, since it is filled
with water.
8. To eliminate air bubbles, fill the cold legs with water or other fill fluid from the lowest point in the system, typically
the MVT, using the following steps:
a. Open the blowdown valve or remove the filling plug from one of the pipe tees/condensate pots.
b. Open the equalizer and bypass/block valves on the block manifold. Ensure the vent valve is closed.
c. Remove the corresponding (high pressure or low pressure) vent screw from the side of the MVT and insert a
fitting to allow connection of a hand pump or funnel. If a funnel is used, attach a length of Tygon tubing that is
long enough to elevate the funnel well above the condensate pot to force the fluid up the legs.
d. Connect a hand pump or funnel to the fitting.
e. Pour fill liquid into the funnel or pump it into the cold leg, tapping the cold leg occasionally to dislodge any
bubbles.
f. Observe the pipe tee/condensate pot and stop pouring when the fill liquid is visible at the top and no air bubbles
can be seen.
g. Remove the fitting from the vent of the MVT and quickly replace the vent screw and tighten.
h. Close the blowdown valve or replace the filling plug from one of the pipe tees/condensate pots.
i. Repeat steps a through h for the other cold leg.
9. To eliminate an offset of the differential pressure reading, open the equalizer valves on the block manifold, remove the
caps from the seal pots, and adjust either seal pot vertically to bring the water levels to the exact same elevation.
10. Follow guidelines outlined in MVT manual to perform a manifold leak test.
11. Wire outputs or COM connections from the MVT to the inputs or COM connections on the back of the Scanner
3300.
12. Verify the zero offset (and other calibration points), if required.
CAUTION Do not put the MVT into operation until the valves are positioned properly so that pressure is sup-
plied to both sides of the transducer.
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Scanner 3300 EFM Section 2