UTICA BOILERS OLSSV-050 Installation, Operation & Maintenance Manual page 85

50/75/100 MBH - PRIMARY LOOP EQUIVALENT LENGTH CALCULATION & PUMP SELECTION
Chart 3
Pipe Diameter
1¼"
(Any pipe/fitting
larger than 1¼",
count as 1¼")
Total Equivalent Length of 3/4"
Pipe Loop, L, ft.
From
0
16
41
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
15
40
80
A
Enter Number of
Fittings
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
Chart 4
Pump options (Minimum)
Grundfos
UP 15-42
UP 26-64
UP 26-99
85
B
Equivalent Length
Multiply By
1.875
1
3.75
1.25
6.25
37.5
Pump Factor
Taco
Taco-008
Taco-0014 NRF-45 speed-3
Taco-0013 NRF-36 speed-3
P/N# 2400010616, Rev. F [10/26/2015]
C
A x B
B&G
NRF-22