85
50/75/100 MBH - PRIMARY LOOP EQUIVALENT LENGTH CALCULATION & PUMP SELECTION
Chart 3
A
B
C
Pipe Diameter
Fitting
Enter Number of
Fittings
Multiply By
Equivalent Length
A x B
1¼"
(Any pipe/fitting
larger than 1¼",
count as 1¼")
90° Elbow
1.875
45° Elbow
1
Tee-branch
3.75
Tee-through
1.25
Swing check valve
6.25
Lift check valve
37.5
Enter Total 1¼" 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 0.088
Pump Factor
Chart 4
Total Equivalent Length of 3/4"
Pipe Loop, L, ft.
Pump options (Minimum)
From
To
Grundfos
Taco
B&G
0
15
UP 15-42
Taco-008
NRF-22
16
40
UP 26-64
Taco-0014
NRF-45 speed-3
41
80
UP 26-99
Taco-0013
NRF-36 speed-3
Note:
If the heating system uses antifreeze solution 30% or higher, choose the next larger size pump listed in
this table.
PN 240011342 Rev. E [05/31/2018]
