Control valves
Desuperheaters
Detailed example 2 (continued)
A Spirax Sarco Size 10 spray type desuperheater has been selected. The maximum cooling water pressure required is 9.79 bar g and
there is a negligible steam-side pressure drop.
Spirax Sarco Spray Type Desuperheater Data Sheet
v2.0
1
Client :
Spirax-Sarco Limited
Client Project Ref :
2
Client's Ref :
DETAILED EXAMPLE 2
Plant Location :
3
Spirax Sarco Ref :
STD00519
Equip. Item No. :
4
Description :
Size 10 Spray Type Desuperheater
No. OFF :
1
5
Unit Ref :
Size STD250CS6F0
Operation :
6
Drawing No. :
DESTD00519-1
Serial No. :
7
Unit Size :
10
8
INLET CONDITIONS
Case 1
Case 2
Case 3
CONDITIONS UPSTREAM OF LET-DOWN VALVE
2
9
Flowrate (kg/hr)
25000
18000
8500
Case 1
Case 2
Case 3
10
Pressure (bar g)
5
5
5
11
Temperature ( °C)
350
350
350
12
13
COOLING MEDIUM
Case 1
Case 2
Case 3
4
14
Flowrate (kg/hr)
3733
2678.8
1269.2
15
Pressure (bar g)
9.79
7.48
5.55
16
Temperature ( °C)
25
25
25
17
18
Medium -
Water
19
DISCHARGE CONDITIONS
Case 1
Case 2
Case 3
3
20
Pressure (bar g)
5
5
5
21
Temperature ( °C)
163.9
163.9
163.9
22
Flowrate (kg/hr)
28733
20687.8
9769.2
23
24
MATERIALS OF CONSTRUCTION
Nozzle Housing
Carbon Steel ASTM A 350
LF2
25
Main Body
Carbon Steel ASTM A 106 Grade B
Flanges
Carbon Steel ASTM A 105
26
Water Branch
Carbon Steel ASTM A 106 Grade B
Gaskets
Soft Copper
27
Thermal Sleeve
Stainless Steel ASTM A312 TP316L
Spray Nozzle
Stainless Steel
28
29
MECHANICAL DESIGN
Steam
Water
CONNECTION DETAILS
30
Side
Side
Size
Rating
31
Max.Design Pressure (bar g)
10
30
Inlet Steam
10
300 LB
32
Max. Design Temperature ( °C)
374
374
Discharge Steam
10
300 LB
33
Internal Corrosion Allowance
(mm)
1.5
1.5
Cooling Medium
2
300 LB
34
Mechanical Design Code -
ASME B31.3
Flange Type
ASME B16.5 Slip-On
35
Welding Standard -
To Code
36
External Surface Finish -
High Temp. Silicone Aluminium
37
Weight (kg)
180
38
39
DIMENSIONS
40
A ("NB)
10
41
B (mm)
430
42
C (mm)
250
43
D (mm)
800
44
E (mm)
1050
Note: Letters refer to Drawing
0
Issued for sizing only
PDA
22/01/2010
Rev
Description
By
Date
Checked
Date
TI-P475-06 CH Issue 3
Page 11 of 12
Desuperheater Online Program Sizing Guidance
4.8.22
