Emerson Rosemount 3051 Quick Start Manual page 7

August 2016
Table 2. Torque Values for the Flange and Flange Adapter Bolts
Bolt material
Carbon Steel (CS)
Stainless Steel (SST)
O-rings with flange adapters
Failure to install proper flange adapter O-rings may cause process leaks, which can result in death or
serious injury. The two flange adapters are distinguished by unique O-ring grooves. Only use the
O-ring that is designed for its specific flange adapter, as shown below:
A. Flange adapter
B. O-ring
C. PTFE-based profile (square)
D. Elastomer profile (round)
Whenever the flanges or adapters are removed, visually inspect the O-rings. Replace them if there
are any signs of damage, such as nicks or cuts. If you replace the O-rings, re-torque the flange bolts
and alignment screws after installation to compensate for seating of the PTFE O-ring.
Head markings
316
316
R
Rosemount 3051S/3051/2051
B7M
B8M
316
STM SW
316 316
A
B
C
D
Quick Start Guide
Initial torque Final torque
300 in-lb 650 in-lb
150 in-lb 300 in-lb
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