Installing Drain/Vent Valve - Emerson Rosemount 2051 Reference Manual

Reference Manual
00809-0100-4107, Rev CA
2. Install the process connection. Possible options include:
a. Coplanar process flange:
—
—
b. Coplanar process flange with flange adapters:
—
—
c. Manifold:
—
3. Tighten the bolts to the initial torque value using a crossed pattern. See
appropriate torque values.
4. Using same cross pattern, tighten bolts to final torque values seen in
Table 6-5. Bolt Installation Torque Values
Bolt material
Carbon steel–ASTM-A445 Standard
316 stainless steel–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.
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.
6.5.4

Installing 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 five clockwise turns of sealing tape.
2. Tighten the drain/vent valve seat 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.
Troubleshooting
Hold the process flange in place by installing the two alignment screws to finger tightness (screws
are not pressure retaining). Do not overtighten as this will affect module-to-flange alignment.
Install the four 1.75-in. flange bolts by finger tightening them to the flange.
Hold the process flange in place by installing the two alignment screws to finger tightness (screws
are not pressure retaining). Do not overtighten as this will affect module-to-flange alignment.
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-in. bolts and two 1.75-in.
bolts.
Contact the manifold manufacturer for the appropriate bolts and procedures.
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)
Troubleshooting
July 2017
Table 6-5 on page 83 for
Table 6-5 on page 83.
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)
83