Control systems Desuperheaters
4
2. Spray type desuperheater (STD) A complete Desuperheater ready for installation, including spray nozzle, nozzle housing, thermal sleeve and flanged shell.
Thermal sleeve
Desuperheated steam
Superheated steam
Spray nozzle assembly
Cooling water
4.8 3
Standard STD has welded spray nozzle assembly. Item shown above is STD with removable spray nozzle.
Applications: - Relatively constant load handling duties. - Dumping steam application. - Control of downstream temperature not critical.
Mechanical design temperature and flange rating <371 °C (<700 °F)
ASME 150, ASME 300, ASME 600 + PN16, PN25, PN40 Slip-on (Weld neck optional)
371 - 427 °C (700 - 800 °F) 424 - 570 °C (795 - 1058 °F)
ASME 150, ASME 300, ASME 600 + PN16, PN25, PN40 Weld neck (Slip-on N/A)
ASME 150, ASME 300, ASME 600, ASME 900, ASME 1500 Weld neck (Slip-on N/A)
Materials
Mechanical design temperature up to and including 427 °C (800 °F)
Mechanical design temperature above 427 °C (800 °F) up to and including 570 °C (1058 °F)
Component
Shell
ASTM A106 Grade B
ASTM A335 P11
Water branch
ASTM A106 Grade B
ASTM A335 P11
Flanges
ASTM A105N
ASTM A182 F11
Spray nozzle
ASTM A182 F316L
ASTM A182 F11
Nozzle holder
ASTM A350 LF2N
ASTM A182 F11
Thermal sleeve
ASTM A312 TP316L
ASTM A335 P11
TI-P475-01 TES Issue 5
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Direct Contact Desuperheaters
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