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Mounting the steam pipe(s)
team pipes should be positioned as shown in
S
figures 4-8
following, allowing a minimum rate
of fall back to the unit of 12% to allow the free
flow of condensate back to the humidifier. If
the above fall is not possible, then condensate
separators must be fitted.
I
The position of the steam pipe in a duct system
relative to other items such as bends, filters,
heat exchangers, etc., is critical. The steam
pipe must not be located closer to such items
than the steam absorption distance. Further
information and design guidance on absorption
distances is given in
Steam pipe do's
• Do obtain the project / design engineers
instructions and drawings for the chosen
location of the steam pipe including the
position relative to the top and bottom of
the duct (or sides if the airflow is vertical).
• Do check if an alternative slope has been
specified for the steam pipe.
• Do use a bracket / lug on 54mm dia. steam
pipes for extra support.
• Do use Vapac steam hose or well insulated
copper pipe.
• Do keep the steam hose / pipe as short as
possible (a maximum length of 4 metres is
recommended; use less than 2 metres for
maximum efficiency).
• Do use the full height available between the
unit and steam pipe to provide the maximum
slope (minimum of 12-20%) for condensate
to drain back to the steam cylinder (or down
to a condensate separator). Always provide a
continuous slope.
• Do provide adequate support to prevent
sagging of the steam hose by either
fitting pipe clips every 300-500mm or by
supporting straight lengths on cable trays or
in heat resistant plastic pipe.
• Do ensure radius hose bends are fully
supported to prevent kinks developing when
in service.
Page No 18 of 80
Vapac, Virtuoso VE Humidifier, Installation Manual, EN 2024-01, D301474 Iss 0
figures 8 and 9
following.
• Do add extra insulation to steam hose /
pipe for longer runs (2m - 5m) and in cold
ambient conditions so as to avoid excess
condensate and a reduction in delivered
output.
• Do have a vertical rise off the unit of at least
300mm.
Steam pipe don'ts
• Don't allow steam hose to develop kinks or
sags as this will cause condensate pockets.
• Don't include horizontal runs or 90° elbows
in the steam line.
• Don't install a stop valve (e.g. a manual
isolating valve, a solenoid valve, etc.) in the
steam line.
Model
VE
VE
05
09
35mm
1
1
dia pipe
54mm
-
-
dia pipe
Duct
+ 2000 / - 600 Pa
pressure
Table 2 - Steam pipe requirement
35mm Dia Pipe
Duct Width B (mm)
320-470
470-620
620-770
770-920
920-1070
1070-1200
54mm Dia Pipe
Duct Width B (mm)
700-950
950-1450
1450+
Table 3 - Steam pipe selection
VE
VE
VE
VE
18
30
45
60
1
-
-
-
-
1
1
2
In Duct Length L (mm)
300
450
600
750
900
1050
In Duct Length L (mm)
650
900
1400
VE
90
-
2
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