9
Multiple Manifolds
Multiple Manifolds
– See Page 7 for required pipe sizes and dimensions of manifolds with pipe adapter.
Piping Multiple Manifolds
– Figure 9-3 below shows the standard installation of reduced size manifold. Note the steam
jacketing is trapped separately and the steam discharge is into a tee, not a cross. A cross will
cause uneven steam distribution from manifold to manifold.
When same size manifolds (as the
separator) are used, the piping can
eliminate the drain trap from the
manifold jacket. Note that steam now
discharges into an elbow, not a cross,
and that the manifold steam jackets
are not trapped separately.
Note:
The humidifier steam inlet is
below the bottom manifold. If the
bottom manifold is below the
humidifier inlet, piping should be as in
Figure 9-3.
Note:
When steam supply pressure is
less than 10 psig and total length of
manifolds is greater than 20 feet, trap
manifolds separately as shown in
Figure 9-3.
Chart 9-1. Header Size of Manifold Piping Out of Humidifier
Separator
Minimum
Suggested
Size
Pipe Size
Header Size
90
1
/
2
"
3
/
4
"
91
1
/
2
"
2"
92/1200
3
/
4
"
2
1
/
2
"
93/1300
1"
3"
94/1400
2"
5"
Humidifier discharge piping, even with reduced sized
manifolds must be as shown.
Figure 9-2. Manifold Pipe Adaptor
Figure 9-1. Pipe Connection at Humidifier
Figure 9-3. Piping of Reduced Size Manifolds
Figure 9-4. Piping of Same Size Manifold When All Manifolds Are Above Humidifier Inlet
