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Control systems Desuperheaters
Pressure / temperature limits Spirax Sarco desuperheaters are bespoke products, individually designed to meet user defined process conditions. Mechanical design pressure and mechanical design temperature limitations are stated on the desuperheater data sheet available from our online sizing software. These limits are also stated on the product nameplate. Pressure / temperature ratings for these products will be in accordance with ASME B16.5-1996 or EN 1092-1:2013 as appropriate. Available types Spray type desuperheaters A simple type of in-line desuperheater with cooling water injected into the centre of the unit via an atomizing nozzle sprayed in the direction of the steam flow. Spirax Sarco spray type desuperheaters are available in two options:-
1. Spray nozzle desuperheater (SND) The assembly is designed for mounting on a suitable flanged branch on the steam pipework. A thermal sleeve installed downstream of the unit is recommended.
Applications: - Relatively constant load handling duties. - Retrofitting a desuperheater to an existing steam line (steam line and thermal sleeve by others). - Large steam lines where an STD could be cost prohibitive.
Steam flow
4.8 2
Simple spray nozzle type desuperheater (SND)
Mechanical design temperature and flange rating <371 °C (<700 °F)
ASME 150, ASME 300, ASME 600, ASME 900, ASME 1500 + PN16, PN25, PN40, PN63 and PN100 Slip-on ASME 150, ASME 300, ASME 600, ASME 900, ASME 1500 + PN16, PN25, PN40, PN63 and PN100 Weld neck
371 - 427 °C (700 - 800 °F) 424 - 570 °C (795 - 1058 °F)
ASME 150, ASME 300, ASME 600, ASME 900, ASME 1500 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)
Pipe
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
TI-P475-01 TES Issue 5
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Direct Contact Desuperheaters
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