Example Pump Sizing Calculation - FAFCO Connected Tube CT Series Installation Manual

APPENDIX B — Pump Sizing

Example Pump Sizing Calculation

Example Table 1: Head Loss Calculation Table for 2" PVC Fittings
Fitting Used
45° Elbow
90° Elbow
Sweep
Tee's
Total Fitting Equivalent Length (ft)
Feet of Straight Piping Used (ft)
Equivalent Sys Straight Pipe Length (ft)
Panel Eq. Head
Loss (ft)
System Dynamic
Head Loss
Calculation
Vertical Head Loss (ft)
Head Loss in other Pool Equipment (ft)
Total Head Loss (ft)
Total Head Loss (psi)
Example Table 2: Head Loss at Flow Rates in 2" PVC
Flow Rate (GPM) Head Loss/ft Piping (ft) Flow Rate (GPM) Head Loss/ft Piping (ft)
0
4.5
8
10
15
20
25
30
35
40
2" PVC Acceptable for Flow Rate 2" PVC Not Recommended for Flow Rate
Equivalent Pipe Length
Head Loss of Fitting (ft)
Box A
2.7
Box B
8.5
Box C
3.6
Box D
12
# Panels on Roof/# Rows
/
Box P
8 2
System Flow Rate (GPM)
2
(#Panels*0.1GPM/ft ea.)
Box S
38.4
(round to 40)
0.000
0.0005
0.001
0.002
0.004
0.008
0.010
0.017
0.018
0.028
Quantity Used
Box E
8
Box F
18
Box G
0
Box H
3
Box M
Box N
Box O
Average Bank Size
Box Q
(Box P result)
4
Head Loss/ft Piping (ft)
(from System Flow Rate)
Box T (Table A2 from box S)
0.028
Box V
Box W
32 (
Box X
85 FT
Box Y
36 PSI
45
50
55
60
65
70
75
80
85
90
Totals
Box I
= 22
Box J
= 153
Box K
= 0
Box L
= 36
(I+J+K+L)
211
(total pipe length used)
80
291
Pressure Drop (ft)
Box R
(Box Q*5.1 ft ea. panel)
20.4
Total Dynamic Head Loss (ft)
Box U
8.1
(Pump to top header height)
24
(Losses for filter, heater, etc.)
)
~14 psi
(R+U+V+W)
(X*0.43)
0.036
0.043
0.053
0.060
0.070
0.079
0.091
0.102
0.114
0.126
®
(A*E)
(B*F)
(C*G)
(D*H)
(M+N)
(T*O)
29