Data Sheet
Bulletin 74.1:T205B
4
Figure 3. Type T205B Actuator Casing Drainage
HORIZONTAL PIPELINE
VENT POINTED DOWN
DOWNSTREAM CONTROL LINE
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
Type T205B regulator may be installed in any
orientation as long as the ow through the body
matches the direction indicated by the arrow on the
body. To achieve the published capacities at low
setpoint, the spring case barrel should be installed
pointed down as shown in Figure 2. For complete
actuator casing drainage, regulator should be installed
as shown in Figure 3. To keep the vent assembly
from being plugged or the spring case from collecting
moisture, corrosive chemicals or other foreign material,
point the vent down or otherwise protect it. If an indoor
installation is required and if hazardous gas service
is used, the vent should be piped outside. External
dimensions and connections are shown in Figure 5.
Emerson Process Management Regulator
Technologies, Inc. provides an instruction manual with
every regulator shipped. Refer to this for complete
installation, operation and maintenance instructions.
Included is a complete listing of individual parts and
recommended spare parts.
Type T205B regulator has an outlet pressure ratings
that are lower than its inlet pressure ratings. Install
downstream overpressure protection if the inlet
pressure can exceed the outlet pressure rating.
Refer to the Capacity Information section and the
relief sizing coefcients in the Specication sections to
determine the required relief valve capacity.
Optional materials are available for applications
handling sour gases. These constructions comply
with the recommendations of National Association of
Corrosion Engineers (NACE) sour service standards.
The manufacturing processes and materials used by
Emerson assure that all products specied for sour
gas service comply with the chemical, physical and
metallurgical requirements of NACE MR0175-2002.
Customers have the responsibility to specify correct
materials. Environmental limitations may apply and
shall be determined by the user.
(1)
3/4 or 1 20 or 25
Gray cast iron NPT 150 10.3
WCC Carbon steel
NPT, CL150 RF,
CL300 RF or
PN 16/25/40 RF
200 13.8
CF8M/CF3M
Stainless steel
(2)
1. All flanges are welded. Weld-on flange dimension is 14 inches / 356 mm face-to-face.
2. Pipe nipples and flanges are 316 Stainless steel for flanged body assemblies.
Table 1. Body Sizes, End Connection Styles and Maximum Allowable Inlet Pressures