Emerson Rosemount 2051 Reference Manual page 106

Troubleshooting
September 2020
3. Tighten the bolts to the initial torque value using a crossed pattern. See
4. Using same cross pattern, tighten bolts to final torque values seen in
Example
Table 6-6: 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.
6.7.4 Installing drain/vent valve
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
106
• 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-inch bolts to mount securely to the
coplanar flange. For gauge pressure configurations, use two 2.88-inch
bolts and two 1.75-inch bolts.
a) Manifold:
• Contact the manifold manufacturer for the appropriate bolts and
procedures.
for appropriate torque values.
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)
Rosemount 2051 Pressure Transmitter
Reference Manual
00809-0100-4107
Table 6-6
Table 6-6.
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)