Control systems Desuperheaters
4
Distances The diagram below indicates the recommended straight length distances between the desuperheater and upstream/ downstream equipment. The distances are represented by length 'A' and 'B'. Combined pressure reducing/desuperheating station
Pressure controller
Pressure regulating control valve
B
Steam supply
Desuperheater
A
4.8 15
Temperature regulating control valve
Check valve
Cooling water
Temperature controller
Recommended distances for location of pressure and temperature sensors and equipment: Residual superheat 180 °F 90 °F 55 °F 25 °F 20 °F 9 °F (100 °C) (50 °C) (30 °C) (15 °C) (10 °C) (5 °C)
8 ft (2.4 m)
12 ft (3.7 m)
16 ft (5.0 m)
20 ft (4.9 m)
22 ft (6.7 m)
25 ft (7.6 m)
B
Downstream distance required (straight)
A
5 pipe diameters or 5 ft (1.5 m) minimum
Upstream distance required (straight)
'The greater the residual superheat, the faster the water droplets are absorbed'
TI-P475-06 CTLS Issue 4
Page 5 of 12
Desuperheater Online Program Sizing Guidance
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