Primary Loop Equivalent Length Calculations & Pump Selection - Dunkirk Helix VX-050 Installation, Operation & Maintenance Manual

150/200 MBH - PRIMARY LOOP EQUIVALENT LENGTH CALCULATION & PUMP SELECTION
Chart 3
Pipe Diameter
1½"
(Any pipe/fitting
larger than 1½",
count as 1½")
Total Equivalent Length of Primary
From
0
21
Note: If the heating system uses antifreeze solution 30% or higher, choose the next larger size pump listed in
this table.
Fitting
90° Elbow
45° Elbow
Tee-branch
Tee-through
Swing check valve
Lift check valve
To
20
35
A
Enter Number of
Fittings
Enter Total 1½" straight pipe length in feet
Add up numbers in column C
Total equivalent length of Primary
Multiply Total of Column C in Chart 3 by 0.15
Chart 4
Pump options (Minimum)
Grundfos
UP 26-99
UP 26-116
87
B
Equivalent Length
Multiply By
3.8
2.0
7.5
2.5
12.5
75.0
Pump Factor
Taco
Taco-0013 NRF-36 speed-3
Taco 2400-20
P/N# 240010618, Rev. E [07/2015]
C
A x B
B&G
PL-36