Dispersion Tube Installation - VAPORSTREAM VLC Installation Instructions And Maintenance Operations Manual

Dispersion Tube Installation with Condensate Drain
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 pre-
vent sags or low spots. When this is not possible due
to duct elevation or an obstruction, alternate arrange-
ments 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 VAPOR-
STREAM VLC, as shown in figure 10-2, with an air
®
vent. This method requires a water seal and an air
gap to prevent back pressure from the VLC chamber.
Excessive back pressures imposed on the humidi-
fier 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 m,
consult factory for special recommendations.
Figure 9-1: Single Tube
A
A
Ø "B" (TYP)
Ø 15 mm
85 mm
DN 8 (¼") Coupling

DISPERSION TUBE INSTALLATION

65
mm
A
A
85 mm
Movable Duct Plate (Can be mounted within limits of 65 mm.)
Hard Piping (when used)
• Hard piping should have a minimum of DN 40 (1 ½").
• A minimum pitch of 165 mm/m back to the humidifier
must be maintained.
• 90° elbows are not recommended; use two 45° elbows
one foot 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
• Mount dispersion tubes pitched as stated above.
• Tubelets must discharge perpendicular to air flow.
• Return line piping material must be suitable for 100°C
water.
Min. Condensate Drain Line Sizing
• One or two tubes: DN 20 (¾").
• Three or more tubes: DN 25 (1").
Table 9-1: Dispersion Tube Capacities
Capacity
Without With
Ø Tube
Drain Drain
38 mm 13 Kg/h 26 Kg/h
50 mm 26 Kg/h 39 Kg/h
Insertion Length
165 mm/m Pitch
10 mm/m Pitch
DN 15 (½") Stainless Steel (conden-
sate drain)
A B
85 mm 40 mm
130 mm 50 mm
Mounting Nut
Pre-molded High
Temperature Resin Steam Tubelets
Mounting Nut
OM-351
9