I N S T R U C T I O N S
For the installation and maintenance of DS1525 - DS1550 -
DS2525 - DS2550 desuperheaters
IMI0030E.doc
Rev.4 20/08/12
20090 SEGRATE (MI)- via E.Fermi
EMAIL:
TEL.(02) 269912.1 - FAX.(02) 2692.2452
Page 10 of 17
The minimum length of tube required downstream varies according to application and is specified in the
respective quote. This length without bends is necessary to prevent erosion caused by drops of water
deposited on the walls of the pipes, the valves and the fittings, and is normally a minimum of 4, 6 m
(a straight length of pipe is not generally necessary upstream). The distance that separates the
desuperheater from the temperature sensor is between 12 and 15 m, although the specific distance for
the application is generally specified in the quote.
Longer distances ensure complete evaporation of the water at lower vapour speeds. The temperature
sensor must be positioned in the top half of the pipe. Avoid fitting branches of the vapour pipe between
the desuperheater and the sensor (see Fig. 3).
1) Temperature sensor
2) Temperature transmitter
3) Temperature control
4) H.T. Desuperheater
5) Air regulator filter
6) Safety valve
7) Filter
8) Check valve
9) Flange
10) Pneumatic positioner
Fig. 3
The unit can be fitted on either horizontal or vertical pipes. The direction of water injection must
correspond to the direction of vapour flow. The desuperheater can be fitted at 90° to the vapour pipe,
regardless of direction of flow. The possible variations are illustrated in Fig. 4. If installed horizontally, the
unit must be mounted with a weight-compensation system.
Fig. 4
