Control valves

Desuperheaters

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

regulating

control valve

Pressure controller

B

Desuperheater

Steam supply

A

Non return valve

controller

Cooling water

Temperature

Residual superheat

B Downstream distance required (straight)

A Upstream distance required (straight)

2.5 m

100 °C

50 °C

30 °C

15 °C

3.7 m

5.0 m

6.25 m

6.8 m

The greater of 5 pipe diameters or 1.5 m

10 °C

5 °C

7.5 m

Temperature regulating

control valve

Recommended distances for location of pressure and temperature sensors and equipment:

TI-P475-06 CH Issue 3

Page 5 of 12

'The greater the residual superheat, the faster the water droplets are absorbed'

Desuperheater Online Program Sizing Guidance

4.8.16