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P a g e 6 8 • D R I - S T E E M D e s i g n G u i d e

D R I - S T E E M D e s i g n G u i d e • P a g e 6 9

maximum lift of 2.5' (0.76 m). Do not attempt lifts in excess of 5'

(1.5 m).

• Steam trap. When lifting condensate, use an inverted bucket type

steam trap. Float and thermostatic (F&T) traps are more prone

to water hammer damage with a flooded trap, which may occur

when lifting condensate.

• Pipe size. The size of the vertical portion of the piping should be

" (DN15) pipe thread.

• Check valve (swing type). Install a low-pressure differential swing

check-valve adjacent to the trap. This will prevent backflow of

condensate into the humidifier during periods of little or no

steam pressure. Failure to do so could result in the accumulated

backflow discharging from the humidifier when steam pressure is

resumed. Spring type check-valves are not recommended as they

can reduce pressure available for condensate lifts.

Eliminating excess heat from pressurized steam-jacketed

humidifiers

In some applications with steam-jacketed humidifiers, the heat

given off by the steam-heated tube (not the sensible heat of the

steam) may be undesirable. While relatively insignificant in a single-

tube unit (usually a rise of less than 2 °F [1 °C]), it can be much

greater in a closely-spaced, multiple-tube installation. This can be

dealt with in several ways:

1. Manually turn off the steam supply valve during nonhumidifying

periods.

2. Insulate the tube exterior. (Note that this enlarges the tube

profile, causing additional resistance to airflow.)

3. Provide an automatic shut-off valve for the jacketing steam

circuit in addition to the modulating control valve. This

Humidier isolation valve

Modulating control valve

Figure 68-1:

Single humidifying steam path

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DriSteem Vaporstream Especificaciones Pagina 72