Emerson Rosemount 1199, Reference Manual, Page: 45 / 104

3.13 RTW remote threaded type seals
Figure 3-16: RTW Threaded Seal
B
D
A. Upper housing
B. Diaphragm
C. Lower housing or flushing ring
D. Connection to transmitter
Note
A lower housing is always required for the RTW type seal.
Table 3-4: RTW Upper Housing Torque Values
Material (nuts and bolts) Bolt thread size MWP (psi) Torque
CS and SST 3/8–24 NF 1500
(1)
23 ft-lb
CS 3/8–24 NF 2500 23 ft-lb
SST 3/8–24 NF 2500 23 ft-lb
CS 3/8–24 NF 5000 53 ft-lb
SST ½ –20 NF 5000 50 ft-lb
CS ½ –20 NF 10000 105 ft-lb
(1) 1500 psi MWP RTW’s are only available on 4.1-in. diaphragm sizes.
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 threaded connection.
Standard NPT torque values for the size threads in the lower housing should be applied
here.
Reference Manual Installation
00809-0100-4002 May 2020
Rosemount DP Level 45