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Reference Manual
00809-0200-4101, Rev AA
July 2008
2-13
Rosemount 2051
Flange Bolts
The 2051 is shipped with a Coplanar flange installed with four 1.75-in. (44
mm) flange bolts. See Figure 2-6 and Figure 2-7 on pages 2-14 and 2-14.
Stainless steel bolts are coated with a lubricant to ease installation. Carbon
steel bolts do not require lubrication. No additional lubricant should be applied
when installing either type of bolt. Bolts are identified by their head markings:
Bolt Installation
Only use bolts supplied with the 2051 or provided by Emerson Process
Management as spare parts. When installing the transmitter to one of the
optional mounting brackets, torque the bolts to 125 in-lb. (0,9 N-m). Use
the following bolt installation procedure:
1. Finger-tighten the bolts.
2. Torque the bolts to the initial torque value using a crossing pattern.
3. Torque the bolts to the final torque value using the same
crossing pattern.
Torque values for the flange and manifold adapter bolts are as follows:
Table 2-3. Bolt Installation
Torque Values
Carbon Steel (CS) Head Markings
B7M
B8M
F593_*
Stainless Steel (SST) Head Markings
* The last digit in the F593_ head marking
may be any letter between A and M.
316
See “Safety Messages” on page 2-1 for complete warning information.
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 L5 300 in.-lb (34 N-m) 650 in.-lb (73 N-m)
ASTM-A-193 Class 2, Grade
B8M—Option L8
150 in.-lb (17 N-m) 300 in.-lb (34 N-m)