Pump System Design
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#5 Pump System Design
#5 Pump System DesignSteve HubbsMarch 2014
Static WaterLevel~140SYSTEM HEAD = 140
Static WaterLevel~140Pump pressure = 54 psiPump OFF~15Pressure
gauge reads:(140-15)/2.31 = 54 psiSYSTEM STATIC HEAD = 140
Static WaterLevel~140Hydraulic Grade Line @ 150 gpmPump pressure
= 72 psiPump ON150 gpm42f = 0.002083 (100/c)1.852 q1.852/dh4.8655
=> 42 pipe friction loss=HfL = total line length (3000 feet)c=
roughness of pipe wall (140 for PVC)q= flow through the pipe (150
gpm)dh = pipe diameter (4 inches)520Pressure gauge
reads:(187-20)/2.31 = 72 psiSYSTEM HEAD = 42+140+5= 187
Static WaterLevel~140Hydraulic Grade Line @ 250 gpmPump pressure
= 101 psiPump ON250 gpm109Hf = 10910SYSTEM HEAD=109+140+10 =
259Pressure gauge reads:(259-25)/2.31 = 101 psi25
L = total line length (3000 feet)c= roughness of pipe wall (140
for PVC)q= flow through the pipe (250 gpm)dh = pipe diameter (4
inches)SANTIAGO NEW WELL-15 HPLine length = 3000Line
Size6inchgpmHfdrdwnTSH ft10032516715062817425015351903302540205Line
Size4inchgpmHfdrdwnTSH
ft100202518515042282102501093528333018240362
8Static WaterLevel~150Hydraulic Grade Line @ 175 gpmPump ON56NEW
SANTIAGO WELL4 inch Supply LineSystem Head = 236~30Pressure gauge
reads:(226-45)/2.31 = 78 psiHf = 56 ~15L = total line length (3000
feet)c= roughness of pipe wall (140 for PVC)q= flow through the
pipe (175 gpm)dh = pipe diameter (4 inches)f = 0.002083
(100/c)1.852 q1.852/dh4.8655
Static WaterLevel~150Hydraulic Grade Line @ 240 gpmPump ON13NEW
SANTIAGO WELL6 inch Supply LineSystem Head = 196~33Pressure gauge
reads:(196-48)/2.31 = 64 psiHf = 13 ~15L = total line length (3000
feet)c= roughness of pipe wall (140 for PVC)q= flow through the
pipe (240 gpm)dh = pipe diameter (6 inches)f = 0.002083
(100/c)1.852 q1.852/dh4.8655
REFERENCESPump Motor and Head Loss calculations Total pumping
head (system performance curve)Hazen-Williams
formulashttp://www.engineeringtoolbox.com/hazen-williams-water-d_797.htmlAdd
~10% for fittings or calculate separately if pipe is long and
fittings are few.System Curves and Pump Performance Curves (from
Engineering in a
Box)http://www.engineeringtoolbox.com/pump-system-curves-d_635.htmlMotor
horsepower neededSizing the motor:
http://www.engineeringtoolbox.com/pumps-power-d_505.htmlPump
Efficiency (typically 60% efficient, so make sure to include in
motor
sizing.http://www.engineeringtoolbox.com/best-efficiency-point-bep-d_311.html
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