47
STEAM INJECTION INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
NOTES:
1. To avoid metal fatigue, allow for thermal expansion of dispersion tubes.
2. Dashed lines indicate provided by installer; right-hand discharge shown.
3. Drawing represents a left-hand discharge.
4. Slightly better mixing with less visible vapor travel occurs when discharged steam blows against the airflow, rather
than with the airflow. Therefore,
when using noninsulated steam jackets in a horizontal airflow
, position dispersion
tubelets (steam orifices) so that they face into the airflow.
If the dispersion tube has an insulated jacket, the discharged steam must blow with the airflow to avoid
condensation that may occur when discharged steam contacts the cooler insulated jacket. Therefore,
when using
insulated steam jackets in a horizontal airflow
, position dispersion tubelets so that they discharge steam with the
airflow, and also add 24" (610 mm) to the non-wetting absorption distance.
5. Center tube assembly within duct height.
6. If steam pressure is less than or equal to 15 psi (103.4 kPa), use float and thermostatic (F&T) traps for the
humidifier.
If steam pressure is greater than 15 psi (103.4 kPa), use inverted bucket traps for the humidifier.
If lifting condensate, use an inverted bucket trap and check valve regardless of steam pressure. (see Figure 12-1)
7. See the previous page for face width and face height dimensions.
8. See “Pressurized steam piping guidelines” on Pages 10 – 13.
OM-7480
Field piping
MINI-BANK HUMIDIFIER
Escutcheon plates fit around
tubes. Secure and seal
moveable escutcheon plates
(plates can be mounted
within limits of 1½” [38
mm]).
Separator trap
Valve
Face width
Separator
1/2" pipe
thread
(DN15) inlet
Level
Condensate returns
10-32 (M5) tapped
hole to attach
dispersion end to
duct
12"
(305 mm)
min.
Dispersion tube
Union
1.5"
(38 mm)
Install strainer within 3' (1 m)
from humidifier. Piping
downstream from strainer
should be same size as
strainer.
3/4" pipe
thread (DN20)
From steam
source
12" (305 mm) min.
4" (100 mm) min.
Face height
Steam jacket trap
1/2” Pipe thread (DN15) steam jacket inlet
Isolation
valve
(by others)
4" (100 mm) min.
1/2" pipe thread (DN15)
FIGURE 47-1: MINI-BANK HUMIDIFIER IN A DUCT HORIZONTAL AIRFLOW