Install The Drain/Vent Valve - Emerson Rosemount 2051 Reference Manual

Troubleshooting
November 2016
Table 6-7. Bolt Installation Torque Values
Bolt material
CS-ASTM-A445 Standard
316 SST—Option L4
ASTM-A-193-B7M—Option L5
ASTM-A-193 class 2, Grade B8M—Option L8
Note
If replacing the PTFE sensor module O-rings, re-torque the flange bolts after installation to
compensate for cold flow.
Note
After replacing O-rings on Range 1 transmitters 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.
6.8.4

Install the drain/vent valve

1. 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.
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 the
ground and away from human contact when the valve is opened.
60
Reference Manual
00809-0300-4101, Rev BB
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)
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)
Troubleshooting