Emerson Rosemount 3051S FOUNDATION Series - Page 6

March 2018
6
Quick Start Guide
1.5 O-rings with flange adaptors
Table 1. Torque Values for the Flange and Flange Adaptor Bolts
Bolt material Head markings Initial torque Final torque
Carbon Steel (CS) 300 in-lb 650 in-lb
Stainless Steel
(SST)
150 in-lb 300 in-lb
Failure to install proper flange adaptor O-rings may cause process leaks, which can result in death or
serious injury. The two flange adaptors are distinguished by unique O-ring grooves. Only use the
O-ring that is designed for its specific flange adaptor, as shown below:
A. Flange adaptor
B. O-ring
C. PTFE based (profile is square)
D. Elastomer (profile is round)
Whenever the flanges or adaptors 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.
B7M
316
316
316
SW
316
STM
316
R
B8M
A
B
C
Rosemount 3051S/3051/2051/4088
D