Control valves

Desuperheaters

2. Spray type desuperheater (STD)

A complete Desuperheater ready for installation, including spray nozzle, nozzle housing, thermal sleeve and flanged shell.

Thermal sleeve

Superheated

steam

Desuperheated

steam

Spray nozzle assembly

Cooling water

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

Materials

<374 °C ASME 150, ASME 300, ASME 600 + PN16, PN25, PN40 Slip-on (Weld neck optional)

374 - 525 °C ASME 150, ASME 300, ASME 600 + PN16, PN25, PN40 Weld neck (Slip-on N/A)

375 - 570 °C ASME 150, ASME 300, ASME 600, ASME 900, ASME 1500 Weld neck (Slip-on N/A)

Component

Mechanical design temperature

up to and including 425 °C

Mechanical design temperature

above 425 °C up to and including 570 °C

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 CH Issue 3

Page 3 of 9

Direct Contact Desuperheaters

4.8.4