Control systems Desuperheaters
4
Steam atomizing desuperheaters (SAD) A high pressure auxiliary steam supply is used to atomize the incoming water within the diffuser of the unit. The auxiliary steam pressure needs to be at least 1.5 times the desuperheater inlet pressure with a minimum pressure of 3 bar g.
Internal nozzle
Internal diffuser
Steam flow
Steam flow
Seals
Atomising steam Cooling water
4.8 5
Application - High turndown applications where auxiliary steam is available, eg ;combined pressure reducing/desuperheating stations.
Mechanical design temperature and flange rating <371 °C (<700 °F)
ASME 150, ASME 300, ASME 600 + PN16, PN25, PN40 Slip-on (Weld neck optional)
374 - 525 °C (700 - 977 °F)
ASME 150, ASME 300, ASME 600 + PN16, PN25, PN40 Weld neck (Slip-on N/A)
Materials Component
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)
Shell
ASTM A106 Grade B
ASTM A335 P11
Atomising steam branch
ASTM A106 Grade B
ASTM A335 P11
Water branch
ASTM A106 Grade B
ASTM A335 P11
Flanges
ASTM A105N
ASTM A182 F11
Nozzle
ASTM A182 F316L
ASTM A182 F11
Diffuser
ASTM A182 F316L
ASTM A182 F11
Internal housing
ASTM A350 LF2N
ASTM A182 F11
Internal seals
Soft copper
Soft copper
TI-P475-01 TES Issue 5
Page 5 of 9
Direct Contact Desuperheaters
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