Rtw Remote Threaded Type Seals - Emerson Rosemount 1199 Reference Manual

Reference Manual
00809-0100-4002
3.13

RTW remote threaded type seals

Figure 3-16: RTW Threaded Seal
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)
CS and SST
CS
SST
CS
SST
CS
(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.
Rosemount DP Level
Bolt thread size MWP (psi)
3/8–24 NF 1500
3/8–24 NF 2500
3/8–24 NF 2500
3/8–24 NF 5000
½–20 NF 5000
½–20 NF 10000
Installation
D
B
Torque
(1)
23 ft-lb
23 ft-lb
23 ft-lb
53 ft-lb
50 ft-lb
105 ft-lb
May 2020
45