Emerson Rosemount 2051 Quick Start Manual page 6

Quick Start Guide
Table 1. Torque Values for the Flange and Flange Adapter Bolts
Bolt material
Carbon Steel (CS)
Stainless Steel (SST)
1.5 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 is square)
D. Elastomer (profile is 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.
6
Head markings
316
316
R
Rosemount 3051S/3051/2051
B7M
B8M
316
STM SW
316 316
A
C
D
October 2016
Initial torque Final torque
300 in-lb 650 in-lb
150 in-lb 300 in-lb
B