Emerson Rosemount MultiVariable 3051SMV, Справочное руководство

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46
Reference Manual
00809-0100-4853, Rev AB
Operation and Maintenance
January 2017
Operation and Maintenance
b. If the installation requires a
1
/
2
–14 NPT connection(s), use flange adapters and four 2.88-in.
process flange/adapter bolts.
c. Hold the flange adapters and adapter O-rings in place while finger-tightening the bolts.
d. Tighten the bolts to the initial torque value using a crossed pattern. See
Table 4-1 for appropriate
torque values.
e. Tighten the bolts to the final torque value using a crossed pattern. See Table 4-1 for appropriate
torque values. When fully tightened, the bolts should extend through the top of the module
housing.
f. Torque alignment screws to 30 in-lbs. (3.4 N-m). If the installation uses a conventional manifold,
then install flange adapters on the process end of the manifold using the 1.75-in. flange bolts
supplied with the transmitter.
Table 4-1. Bolt Installation Torque Values
6. If the sensor module PTFE O-rings are replaced, re-torque the flange bolts and alignment cap screws
after installation to compensate for seating of the PTFE O-ring.
7. Install the drain/vent valve.
a. Apply sealing tape to the threads on the seat. Starting at the base of the valve with the threaded
end pointing toward the installer, apply two clockwise turns of sealing tape.
b. Take care to place the opening on the valve so that process fluid will drain toward the ground and
away from human contact when the valve is opened.
c. Tighten the drain/vent valve to 250 in-lb (28.25 N-m).
d. Tighten the stem to 70 in-lb (8 N-m).
Note
Due to the Range 1 DP Sensor's high accuracy at low pressures, extra steps are required to optimize
performance. It is necessary to temperature soak the assembly using the following procedure.
8. After replacing O-rings on DP Range 1 transmitters and re-installing the process flange, expose the
transmitter to a temperature of 185 °F (85 °C) for two hours.
9. Re-tighten the flange bolts in a cross pattern.
10. Again, expose the transmitter to a temperature of 185 °F (85 °C) for two hours before calibration.
Bolt material Initial torque value Final torque value
CS-ASTM-A449 Standard 300 in-lb (34 N-m) 650 in-lb (73 N-m)
316 SST—Option L4 150 in-lb (17 N-m) 300 in-lb (34 N-m)
ASTM-A-193-B7M—Option L5 300 in-lb (34 N-m) 650 in-lb (73 N-m)
Alloy K-500—Option L6 300 in-lb (34 N-m) 650 in-lb (73 N-m)
ASTM-A-453-660—Option L7 150 in-lb (17 N-m) 300 in-lb (34 N-m)
ASTM-A-193-B8M—Option L8 150 in-lb (17 N-m) 300 in-lb (34 N-m)