DriSteem Vaporstream Especificações descarregar pdf (Página 70)

P a g e 6 6 • 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 7

P i p i n g a s t e a m i n j e c t i o n s y s t e m

Take off branch lines from the top of the

steam main, preferably at a 45° angle,

although vertical 90° connections are

acceptable

45°

Pitch main "

per 10' (0.2%)

Pitch humidier branch 1/2"

per 10' (0.4%) if distance

from main to humidier is

less than 10' (3.3 m)

Piping same size as

humidier inlet strainer

To humidier.

Inlet strainer must

be within 3' (1 m)

of humidier

Humidier isolation valve

12" (305 mm) minimum

4" (100 mm) minimum

Blowdown valve by installer

Condensate return

Branch

steam

trap

by installer

Branch trap recommended

if distance from

main to humidier is

greater than 10' (3.3 m)

Insulate piping

If pipe is 4" (DN100)

or larger, size drip for

50% of the condensate

load at start-up. If pipe

is less than 4" (DN100),

size drip for 25% of

the condensate load at

start-up.

Automatic

warm-up:

28" (711 mm) minimum.

Supervised warm-up:

1.5 × pipe diameter,

8" (203 mm) minimum.

Blowdown valve

by installer

Condensate return

End of main

steam trap

by installer

Insulate piping

Figure 66-1:

Piping from boiler to humidifier

Pressurized steam piping guidelines

• Size piping in accordance with ASHRAE recommendations.

• The humidifier’s steam supply should be taken off the top of the

steam main (not the side or bottom) to ensure the driest steam.

The main should be dripped and trapped (in accordance with

ASHRAE recommendations).

• The humidifier steam trap(s) must drain by gravity to the return

main having little or no back pressure. If condensate cannot drain

by gravity, then it must be elevated to the return main (see the

next page for instructions).

• If steam pressure is < 15 psi (103.4 kPa), use float and

thermostatic (F&T) traps for the humidifier.

• If steam pressure is >15 psi (103.4 kPa), use inverted bucket traps

for the humidifier.

• If lifting condensate, use an inverted bucket trap. See drawings

and instructions on the next page.

• Condensate from unavoidable heat loss in the distribution

system must be removed promptly to eliminate water hammer,

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DriSteem Vaporstream Especificações Página 70

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