Control systems Desuperheaters
4
Detailed example 2 (continued) A Spirax Sarco Size 10 spray type desuperheater has been selected. The maximum cooling water pressure required is 140 psi g (9.65 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 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
2
12 13
COOLING MEDIUM
Case 1
Case 2 2678.8
Case 3 1269.2
14 Flowrate (kg/hr) 15 Pressure (bar g) 16 Temperature ( °C)
3733 9.79
4
7.48
5.55
25
25
25
4.8 21
17 Medium -
Water
18 19
DISCHARGE CONDITIONS
Case 1
Case 2
Case 3
20 Pressure (bar g) 21 Temperature ( °C) 22 Flowrate (kg/hr)
5
5
5
3
163.9 28733
163.9
163.9
20687.8
9769.2
23 24
MATERIALS OF CONSTRUCTION
Nozzle Housing
Carbon Steel ASTM A 350 LF2 Carbon Steel ASTM A 105
25 Main Body 26 Water Branch 27 Thermal Sleeve
Carbon Steel ASTM A 106 Grade B Carbon Steel ASTM A 106 Grade B Stainless Steel ASTM A312 TP316L
Flanges Gaskets
Soft Copper
Spray Nozzle
Stainless Steel
28 29 30
MECHANICAL DESIGN
CONNECTION DETAILS
Steam
Water
Side
Side
Size
Rating 300 LB 300 LB 300 LB
31 Max.Design Pressure (bar g) 32 Max. Design Temperature ( °C)
10
30
Inlet Steam
10
374
374 1.5
Discharge Steam 10 Cooling Medium 2
33 Internal Corrosion Allowance (mm) 1.5
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) 41 B (mm) 42 C (mm) 43 D (mm) 44 E (mm)
10
430 250 800
1050Note: Letters refer to Drawing
0 Issued for sizing only
PDA
22/01/2010
Rev Description
By
Date
Checked
Date
TI-P475-06 CTLS Issue 4
Page 11 of 12
Desuperheater Online Program Sizing Guidance
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