Emerson Process Management 2051 manual Install the Drain/Vent Valve, Rosemount, Reference Manual

Rosemount 2051

Reference Manual

00809-0200-4101, Rev AA July 2008

a. Coplanar Process 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.

•Install the four 1.75-in. flange bolts by finger tightening them to the flange.

Table 5-11. Bolt Installation Torque Values

b. Coplanar Process Flange with Flange Adapters:

•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 the four configurations, use four 2.88-in. bolts. For gage pressure configurations, use two 2.88-in. bolts and two 1.75-in. bolts.

c. Manifold:

•Contact the manifold manufacturer for the appropriate bolts and procedures.

3.Tighten the bolts to the initial torque value using a crossed pattern. See Table 5-11 for appropriate torque values.

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	300 in-lb. (34 N-m)	650 in-lb. (73 N-m)
L5
ASTM-A-193 Class 2, Grade	150 in.-lb (17 N-m)	300 in.-lb (34 N-m)
B8M—Option L8

Install the Drain/Vent Valve

NOTE

If you replaced 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.

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.

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