Instruction Manual
D103643X012
DFA Desuperheater
August 2013
4
Installation
WARNING
Always wear protective gloves, clothing, and eyewear when performing any installation operations to avoid personal
injury.
Personal injury or equipment damage caused by sudden release of pressure may result if the desuperheater is installed
where service conditions could exceed the limits of the pressure class noted on the nameplate. To avoid such injury or
damage, provide a relief valve for over pressure protection as required by government or accepted industry codes and
good engineering practices.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
Table 2. Desuperheater Connection Size
Design
Steam Line Size, NPS
Steam Line Connection
Size, NPS
ASME Pressure Rating Raised-Face Flange(1)
DFA
8 - 60
3 or 4
CL150-2500
1. Other standard flanges and connections are also available.
Table 3. Available Valve Connections
Valve Inlet Size, NPS
ASME Pressure Rating Raised-Face
Flange(2)
Connection
Inlet
(1,2,3)
Outlet
(1,2)
1,1-1/2, and 2
CL150-2500
RF, RTJ, BW, and SW
RF
1. End connection style abbreviations: RF-Raised Face, RTJ-Ring Type Joint, BW-Butt weld, SW-Socket Weld.
2. EN (or other valve body material) ratings and end connections can usually be supplied; consult your Emerson Process Management sales office.
3. Socket weld available on NPS 1, 1-1/2, and 2 only.
Table 4. Fisher DFA Dimensions
DESUPERHEATER BODY FLANGE
(1)
E
INLET CENTERLINE TO OUTLET FLANGE FACE
(2)
F
INLET FLANGE FACE TO OUTLET CENTERLINE
(2)
Size, NPS
Pressure Rating
mm
Inches
mm
Inches
3 and 4
CL150-1500
152
6
229
9
CL2500
178
7
241
9.5
1. The NPS 4 DFA requires a 4.00 inch minimum mounting I.D. Contact your Emerson Process Management sales office for NPS 3 DFA minimum mounting I.D.
2. For different centerline to flange face distances Contact your Emerson Process Management sales office.
Table 5. Fisher DFA Installation Dimensions
DESUPERHEATER
BODY FLANGE SIZE,
NPS
(“D” DIMENSION)
PIPE LINE
(“B” DIMENSION)
INSERTION LENGTH
(“T” DIMENSION)
T-HEIGHT
Size, NPS
mm
Inch
mm
Inch
3 and 4
8
332
13.00
222
8.75
10
358
14.25
222
8.75
12
384
15.25
222
8.75
14
400
15.75
222
8.75
16
425.4
16.75
222
8.75
18
451
17.50
216
8.50
20
477
17.75
222
8.75
22
502
17.75
222
8.75
24
527
17.75
222
8.75
30
600
17.63
219
8.63
