Cameron Scanner 3100 EFM - Page 45

3. Mount a set of pipe tees (which serve as condensate pots) typically on either side of the Scanner 3100 at an elevation
above the process connections of the Scanner 3100 MVT (for proper drainage). They should be a considerable dis-
tance (see Best Practices, page 42) 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 ttings 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.
6. Route any additional inputs/outputs or COM connections, etc. through the conduit opening in the side of the Scanner
3100. For hazardous areas, review Hazardous Area Precautions, page 27.
Note To prevent ttings 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 Scanner 3100 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 lled
with water.
8. To eliminate air bubbles, ll the cold legs with water or other ll uid from the lowest point in the system, typically
the MVT, using the following steps:
a. Open the blowdown valve or remove the lling 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
tting 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 uid up the legs.
d. Connect a hand pump or funnel to the tting.
e. Pour ll 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 ll liquid is visible at the top and no air bubbles
can be seen.
g. Remove the tting from the vent of the MVT and quickly replace the vent screw and tighten.
h. Close the blowdown valve or replace the lling 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. Perform a manifold leak test as described on page 51.
11. Verify the zero offset, if required (and other calibration points, if desired). See the Scanner 3100 Web Interface User
Manual for complete instructions. See also Zero Offset (Static Pressure or Differential Pressure), page 51, Static
Pressure Calibration and Verication, page 52, and Differential Pressure Calibration and Verication, page 53.
IMPORTANT Do not put the Scanner into operation until the valves are positioned properly so that pressure is
supplied to both sides of the MVT. For instructions on proper valve positions, see
Placing the Scanner into Operation, page 54.
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Scanner 3100 EFM Section 2