Residential Pressure Drop Calculation Worksheet
Job/Client Name __________________________________ GSC Technician __________________________________
Loop Description __________________________________________________________________________________
Total Trench/Bore ____________________________________________________ Number of Circuits ____________
Antifreeze __________________________________________________________ Minimum Loop Temperature _____
a. WF Unit #1 __________@ ___ gpm _________ft. of hd. x_________temp. corr. factor =___________ft. of hd.
1
b. Hose Kit ____________@ ___gpm _________ft. x ______________ft. of hd./100 ft. =____________ft. of hd.
c. Inside Piping _________@ ___gpm _________ft. x ______________ft. of hd./100 ft. =____________ft. of hd.
(Flow Center to Unit) Pipe Size
TOTAL Unit #1
a. WF Unit #2 __________@ ___ gpm _________ft. of hd. x_________temp. corr. factor =___________ft. of hd.
b. Hose Kit ____________@ ___gpm _________ft. x ______________ft. of hd./100 ft. =____________ft. of hd.
c. Inside Piping _________@ ___gpm _________ft. x ______________ft. of hd./100 ft. =____________ft. of hd.
2
3
(Flow Center to Unit) Pipe Size
TOTAL Unit #2
____________ft. of hd.
Unit TOTAL (Largest of Total Unit #1 and Unit #2)
____________ft. of hd.
Inside Supply
Return Piping(to FC) _________@ ___gpm ________ft. x __________ft. of hd./100 ft. =____________ft. of hd.
Pipe Size
4
Outside Supply
& Return Piping _________@ ____gpm _________ft. x ____________ft. of hd./100 ft. =____________ft. of hd.
Pipe Size
5
Circuit Piping __________@ ____gpm _________ft. x ___________ft. of hd./100 ft. =______________ft. of hd.
6
Fittings (Add 2 ft. of hd. for every 10 fittings)
Pipe Size
TOTAL SYSTEM PRESSURE DROP
The purpose of the following formulas
is to generate 3 points on the system
performance curve.
___________ft. of hd.
Total gpm= ______________
Total pressure drop= _________ft. of hd.
Grundfos Pump Curve - UP26 - 99
70
Point 1
Total gpm = 3 gpm per ton = _______
Total pd = pd of the system = _______
60
UP26-99 SINGLE
50
Point 3
Total gpm 3 = 1.33 x gpm = _______
Total pd 3 = 2 x pd =
_______
Point 1 is generated from the design
flow need and the pressure drop (pd)
associated with this particular piping
system. Points 2 and 3 are generated
from point 1.
HEAD (FEET)
UP26-99 DOUBLE
Point 2
Total gpm 2 = .667 x gpm = _______
Total pd 2 = .5 x pd =
_______
40
30
20
10
0
0
5
10
15
20
25
30
35
FLOW (GPM)
NOTE: If using pumps other than shown, refer to the manufacturer’s performance data
. for those pumps
1
RESIDENTIAL EARTH LOOP PRESSURE DROP CALCULATION AND PUMP SIZING MANUAL
FCM Flow Center Pump Curve
- 2 Pumps
Other Pump
Performance Curves
SuperBrute XL UPS60-150, Two in Series
100
HEAD (FEET)
80
3
60
2
40
1
20
0
0
10
20
30
40
50
60
FLOW (GPM)
©2010 WaterFurnace International, Inc., 9000 Conservation
Way, Fort Wayne, IN 46809-9794. WaterFurnace has a policy of
continual product research and development and reserves the
right to change design and specifications without notice.
Manufactured by
WaterFurnace International, Inc.
9000 Conservation Way
Fort Wayne, IN 46809
www.waterfurnace.com
TR1544EW
2
05/10