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Quick Installation Guide
00825-0100-4101, Rev EA
June 2010
Rosemount 2051
6
STEP 1 CONTINUED...
Figure 2. Torque values for the flange and flange adapter bolts
D. O-rings with Flange Adapters
WARNING
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.
Bolt Material Head Markings Initial Torque Final Torque
Carbon Steel (CS) 300 in.-lbs. 650 in.-lbs.
Stainless Steel (SST) 150 in.-lbs. 300 in.-lbs.
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.
B7M
316
316
316
SW
316
STM
316
R
B8M
Rosemount 3051S / 3051 / 2051 / 3095
Rosemount 1151
Flange Adapter
O-ring
Flange Adapter
O-ring
PTFE Based
Elastomer
PTFE
Elastomer
4101_QIG_RevEA.fm Page 6 Tuesday, June 29, 2010 9:26 AM