Emerson Rosemount 3051CF Series Reference Manual page 108

Troubleshooting
July 2020
3. Tighten the bolts to the initial torque value using a crossed pattern.
4. Using the same cross pattern, tighten bolts to final torque values seen in
Table 6-1: Bolt Installation Torque Values
Bolt material
CS-ASTM-A445 Standard
316 SST—Option L4
ASTM-A-19 B7M—Option L5
ASTM-A-193 Class 2, Grade B8M—Option L8
Note
If you replaced the PTFE sensor module O-rings, re-torque the flange bolts after
installation to compensate for cold flow of the O-ring material.
Note
For Range 1 transmitters, after replacing O-rings and re-installing the process flange,
expose the transmitter to a temperature of 185 °F (85 °C) for two hours. Then re-tighten
the flange bolts in a cross pattern and again expose the transmitter to a temperature of
185 °F (85 °C) for two hours before calibration.
See Safety messages
6.4.4 Install drain/vent valve
Complete the following steps to reinstall the drain/vent valve in the Rosemount 3051
Transmitter.
Procedure
1. Apply sealing tape to the threads on the seat. Starting at the base of the valve with
2. Tighten the drain/vent valve to 250 in.-lb. (28.25 N-m).
3. Take care to place the opening on the valve so that process fluid will drain toward
108
b. Hold the flange adapters and adapter O-rings in place while installing (in
the desired of the four possible process connection spacing
configurations) using four 2.88-in. bolts to mount securely to the
coplanar flange. For gage pressure configurations, use two 2.88-inch
bolts and two 1.75-in. bolts.
• Manifold: Contact the manifold manufacturer for the appropriate bolts and
procedures.
See Table 6-1 for appropriate torque values.
for complete warning information.
the threaded end pointing toward the installer, apply five clockwise turns of sealing
tape.
the ground and away from human contact when the valve is opened.
Initial torque value
300 in.-lb (34 N-m)
150 in.-lb (17 N-m)
300 in.-lb (34 N-m)
150 in.-lb (17 N-m)
Reference Manual
00809-0100-4774
Table 6-1.
Final torque value
650 in.-lb (73 N-m)
300 in.-lb (34 N-m)
650 in.-lb (73 N-m)
300 in.-lb (34 N-m)
Rosemount 3051