Emerson Rosemount 1199, Reference Manual

Page: 40 / 104

3.10 RCW remote flanged seal - ring type joint (RTJ)
gasket surface
Figure 3-13: RCW Flanged Remote Seal RTJ and Flushing Connection Ring
D
A. Upper housing
B. Diaphragm
C. Lower housing or flushing ring
D. Stud bolts
Note
A lower housing is always required for the RCW type seal.
Table 3-3: RCW Upper Housing Torque Values
Material (nuts and bolts) Bolt thread size Class Torque
SST 3/8–24 NF 150/300/600 lb 23 ft-lb
CS 3/8–24 NF 150/300/600 lb 23 ft-lb
(1)
SST ½ –20 NF 900/1500 lb 50 ft-lb
CS ½ –20 NF 900/1500/2500 lb 105 ft-lb
(1) 53 ft-lb for 4.1-in. diaphragm size.
Note
This is the specification for connecting the remote seal to the lower housing, not the
torque specification for the lower housing onto the process flanged connection. The lower
housing bolts should be torqued to the applicable flange requirements.
3.10.1 4.1-in. (104 mm) diaphragm diameter option
The standard diaphragm size for the RCW remote flanged seal with RTJ gasket surface is
2.4-in. A larger, 4.1-in. (104 mm), diaphragm size is offered for small spans to reduce
temperature error when taking process measurements.
Installation Reference Manual
May 2020 00809-0100-4002
40 Rosemount DP Level