WHL-016 Rev. 4.14.16
17
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.
System Temperature Rise Chart
20°Δt
25°Δt
30°Δt
Model
Friction Ft
Flow Rate (GPM)
Friction Ft
Flow Rate (GPM)
Friction Ft
Flow Rate (GPM)
055
1.8’
5.3
1.1’
4.2
0.8’
3.5
080
2.8’
8.2
1.9’
6.5
1.3’
5.4
110
4.3’
10.6
2.9’
8.4
1.8’
7
155
2.5’
14.6
1.7’
11.7
1.3’
9.7
199
3.7’
18.7
2.6’
15
1.9’
12.5
285
7’
26.8
4.7’
21.4
3.5’
17.9
399
9.5’
37.5
7.1’
30
5.7’
25
Table 5 - Temperature Rise, Friction Ft and Flow Rate
Figure 7 - Boiler Pressure Drop
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”.
Multiple Boiler Manifold Piping
Maximum Flow Rate
(GPM at 3 Feet per Second)
8
14
19
31.5
45
69
93
120
150
188
271
Schedule 40 Pipe Dia. (In.)
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
4 1/2
5
6
Table 6 - Multiple Boiler Manifold Piping
Summary of Contents for WBC 399
Page 14: ...WHL 016 Rev 4 14 16 14 Figure 6 Boiler Dimensions NOTE All Dimensions Are Approximate 055 080 ...
Page 21: ...WHL 016 Rev 4 14 16 21 Figure 9 Piping Symbol Legend ...
Page 42: ...WHL 016 Rev 4 14 16 42 Figure 33 Internal Connection Diagram ...
Page 65: ...WHL 016 Rev 4 14 16 65 Figure 37 Combustion System Replacement Parts 55 110kBTU Models ...
Page 67: ...WHL 016 Rev 4 14 16 67 Figure 39 Combustion System Replacement Parts 155 399kBTU Models ...