9
Capacity
Tube Without With A B
Dia. Drain Drain
25 mm 4.5 kg/h N/A 80 mm 25 mm
40 mm 13 kg/h 26 kg/h 80 mm 38 mm
50 mm 26 kg/h 38 kg/h 125 mm 50 mm
MOUNTING METHODS
Dispersion Tube Installation with
Condensate Drain
(over 13 kg/h per dispersion tube)
Vapor Hose
When a vapor hose and stainless steel dispersion tube
are used, they should be pitched back to the humidifier.
A minimum slope of 165 mm/m (with no “low spots”) is
recommended. Vapor hose should be supported to
prevent sags or low spots. When this is not possible
due to duct elevation or an obstruction, alternate
arrangements should be used as shown in figure 15-1
or 15-2.
Any condensate that forms in the vapor hose must be
removed. Preferably, it should be returned to an open
drain with a water seal of sufficient height to contain the
duct static pressure, as shown in figure 10-1.
The condensate can also be returned to the VLC, as
shown in figure 10-2, with an air vent. This method
requires a water seal and an air gap to allow conden-
sate to flow back into the VLC chamber.
Excessive back pressures imposed on the humidifier
may lead to dispersion tube(s) spitting, lost water seals,
or leaking gaskets. When the distance between the
humidifier and the dispersion tube(s) exceeds 3 metres,
consult factory for special recommendations.
Rigid Piping (when used)
•Vapor piping should have a minimum I.D. of 40 mm.
•A minimum pitch of 165 mm/m back to the humidifier
should be maintained.
•90°elbows are not recommended; use two 45°
elbows 300 mm apart instead.
•Thin-walled tubing will heat up faster and cause less
start-up loss than heavy-walled pipe.
•Insulating the rigid piping will reduce output loss due
to condensation.
Tube Mounting
•Tubes without condensate return lines, mount
dispersion tube with outboard end 165mm/m
higher than supply end (Example A).
•Tubes with condensate return lines, mount
dispersion tube level (Example B).
•Best vapor absorption occurs when dispersion tube
discharges against the air flow.
•Return line piping material must be suitable for
100°C water.
Minimum Condensate Drain Line Sizing
•One or two tubes: 20 mm I.D.
•Three or more tubes: 25 mm I.D.
Figure 9-1: Single Tube
10 mm O.D. (condensate drain)
Movable Duct Plate (Can be mounted within limits of 60 mm.)
¼" Nipple
80 mm
15 mm Dia.
"B" Dia. (TYP)
A
A
A60
mm
165 mm/m Pitch
Level or 20 mm/m Pitch
Mounting Bracket
Pre-moldedHigh
Temperature Resin Steam Tubelets
Insertion Length
OM-351
Table 9-1: Dispersion Tube Capacities
A
80 mm
ExampleA
ExampleB
Mounting Bracket
