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399 MBH - PRIMARY LOOP EQUIVALENT LENGTH CALCULATION & PUMP SELECTION
These charts are valid for piping diagrams on pages 14 & 18
Instructions:
1.
Pipe diameter determines pump size. Smaller the diameter of pipe, larger the pump. 399 Mbh boiler can be piped in
1¼" pipe. Use charts 1-2 to determine pipe size and respective pump size.
2.
Fill in chart using the 1¼" section first. Then consult chart 3 for pump selection.
3.
Pump size may be decreased by decreasing equivalent length of pipe. Use larger diameter pipe as primary loop to
decrease equivalent length. Use charts 2 or 3.
Note: The Figure below are based on industry average. Consult valve/fitting manufaturer for exact equivalent length or for
fittings not shown below.
Chart 1
Pipe Diameter
1¼"
(Any pipe/fitting
larger than 1¼",
count as 1¼")
For 399MBH Boiler
(This boiler must be piped with a primary loop)
Fitting
90° Elbow
45° Elbow
Tee-branch
Tee-through
Swing check valve
Lift check valve
A
Enter Number of
Fittings
Enter Total 1¼" straight pipe length in feet
Add up numbers in column C
Total equivalent length of Primary
79
B
Equivalent Length
Multiply By
3.1
1.7
6.3
2.1
10.4
62.5
Pump Factor
P/N 240010943, Rev. C [09/07/2016]
C
A x B
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