HTP EL-80 - Page 25

25
LP- 293 REV. 9.2.14
The chart below represents the various system design temperature rise through the boiler along with their respective flows and friction
loss, which will aid in circulator selection.
The chart on the following page 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) EL-220 Boilers® with a design of 20°Δt degree temperature rise with each boiler having an individual flow rate of 22 GPM.
To correctly size the manifold feeding these (5) boilers you would need a pipe size of 4”.
MULTIPLE BOILER MANIFOLD PIPING
Flow Rate (GPM)
16
22
24
30
32
33
40
44
45
48
50
55
60
66
75
80
85
88
90
100
110
Pipe Dia. (Inches)
2
2
2
2
2
2½
2½
2½
2½
2½
2½
2½
2½
2½
3
3
3
3
3
3
4
Table 6
Figure 10
MULTIPLE BOILER MANIFOLD PIPING
Flow Rate (GPM)
120
132
150
160
170
179
200
210
239
240
250
255
300
340
350
400
425
510
595
680
Pipe Dia. (In.)
4
4
4
4
4
4
4
4
5
5
5
5
5
5
5
5
5
6
6
6
Table 7
0
1
2
3
4
5
6
0 50 100 150 200 250
Pipe Diameter Size (Inches)
Combined Boiler Water Flow (GPM)
Multiple Boiler Manifold Piping
Flow Rate
23
GPM
24 GPM
25 GPM
26 GPM
27 GPM
28 GPM
29 GPM
30 GPM
31 GPM
32 GPM
33 GPM
34 GPM
35 GPM
36 GPM
37
GPM
38 GPM
39 GPM
EL-80
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
EL-110
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
EL-150
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
EL-220
21’
23’
24’
*
*
*
*
*
*
*
*
*
*
*
*
*
*
EL-299
EL-301
16.5’
18’
20’
22’
24’
26’
29’
33’
36’
*
*
*
*
*
*
*
*
EL-399
*
*
*
12.9’
13.6’
14’
15.7’
17’
18’
19.4’
21’
22.5’
26’
28’
31’
34’
39’
Table 4 – NOTE: *Do not operate boiler at these flow settings as it will damage the heat exchanger or related components.
Table 5
SYSTEM TEMPERATURE RISE CHART
Model
20°Δt
25°Δt
30°Δt
Ft / Friction
Flow Rate
Ft / Friction
Flow Rate
Ft / Friction
Flow Rate
EL-80
17’
8 GPM
10’
6.6 GPM
7’
5.3 GPM
EL-110
25’
11 GPM
17’
9.1 GPM
12’
7.3 GPM
EL-150
27’
15 GPM
17’
12.5 GPM
12’
10 GPM
EL-220
19’
22 GPM
13’
18.3 GPM
12’
14.6 GPM
EL-299
EL-301
29’
29 GPM
18’
24.5 GPM
13’
20 GPM
EL-399
39’
39 GPM
19’
32.5 GPM
13’
26 GPM