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The chart below represents various system design temperature rise through the boiler along with respective flows and friction
loss. This is provided to aid in circulator selection.
Model
Friction Ft
055
1.8'
080
2.8'
110
4.3'
155
2.5'
199
3.7'
285
7'
399
9.5'
Table 5 - Temperature Rise, Friction Ft and Flow Rate
The chart below represents the combined flow rates and pipe sizes when using multiple boilers to design the manifold system for
the primary circuit. To size, simply add up the number of boilers and the required flow rates for the system design temperature.
Example: (5) 055 boilers with a design of 20°Δt degree temperature rise with each boiler having an individual flow rate of 5.3
GPM. To correctly size the manifold feeding these (5) boilers you would need a pipe size of 2".
Maximum Flow Rate
(GPM at 3 Feet per Second)
Schedule 40 Pipe Dia. (In.)
Table 6 - Multiple Boiler Manifold Piping
Figure 7 - Boiler Pressure Drop
System Temperature Rise Chart
20°Δt
Flow Rate (GPM)
Friction Ft
5.3
8.2
10.6
14.6
18.7
26.8
37.5
Multiple Boiler Manifold Piping
8
14
19
31.5
1
1 1/4
1 1/2
25°Δt
Flow Rate (GPM)
1.1'
4.2
1.9'
6.5
2.9'
8.4
1.7'
11.7
2.6'
15
4.7'
21.4
7.1'
30
45
69
93
2
2 1/2
3
3 1/2
30°Δt
Friction Ft
Flow Rate (GPM)
0.8'
3.5
1.3'
5.4
1.8'
7
1.3'
9.7
1.9'
12.5
3.5'
17.9
5.7'
25
120
150
188
4
4 1/2
5
WHL-016 Rev. 4.14.16
17
271
6
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