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Selecting a Well Pump
Brian Gongol
DJ Gongol & Associates, Inc.
February 2, 2018
Iowa Water Well Association Annual Conference
Altoona, Iowa
[Part 1] Categories
Vertical turbine pumps
Submersible turbine pumps
[Part 2] Basic constraints
Flow
Head
Physical shape and size
Laws of physics
[Part 3] Other limitations
Power
Hydraulic thrust
Downthrust
Shaft elongation
[Part 4] Additional considerations
Power source
Discharge head
Lubrication
Part 1: Categories
1.1 When to choose a vertical turbine
Default option for wells
Motor accessible for maintenance and repair
Alignment maintenance is accessible
Upper bearings are accessible
Alternate power options are available
1.2 When to choose a submersible turbine
Extremely deep wells
Crooked wells
Sites with surface fooding problems
Highly noise-sensitive applications
Extreme surface site constraints
High risk of vandalism
Horizontal pipeline boosters
Part 2: Basic constraints
2.1. Flow
Usually the one "given" in advance
Floor is usually set by demand
Ceiling is usually set by well capacity
2.2. Head
Combination of static and dynamic factors
Static: Water level to pump discharge
Static factors: Drawdown at rated fow
Dynamic factors: Friction inside column
Wild card: Desired pressure at discharge head
Simple if a fxed discharge at a fxed elevation
More complex: Multiple destinations
More complex: Multiple fows
More complex: Varying pressures
2.3. Physical shape and size
Size of hole available
Straightness of the drilled well
Larger diameters mean lower friction loss
Generally seek the most generous size that fts
Constraints at grade level: Footprint
Constraints at grade level: Overhead
2.4. Laws of physics
Do the bowls ft?
Is minimum submergence achieved?
Is sufcient NPSH available?
Is the total head less than the bowl's limits?
Part 3: Other limitations
3.1. Power
Hydraulic efciency
Drive (motor) efciency
Proper grounding is essential
Sizing for non-overloading power
Motor cooling: Above-grade
Motor cooling: Submersible
3.2. Hydraulic thrust
Multiply total head by thrust factor
3.3. Downthrust in three easy calculations
(a) Hydraulic thrust
(b) Weight per stage times number of stages
(c) Weight per foot of shaft times length
Downthrust = (a) + (b) + (c)
3.4. Shaft elongation
Shaft & column stretch due to hydraulic thrust
Impellers must not rub against bowls
Net elongation = column - shaft elongation
Elongation is proportional to thrust
Elongation inversely proportional to shaft area
Bigger shafts mean less elongation
4.1. Power source
Vertical turbine: Usually weather-protected
Premium efciency motors now dominant
Rate engines carefully for demand
4.2. Discharge head
Determined by column, header, and driver size
Cast discharge heads usually start cheaper
High horsepowers require fabricated heads
VFD operations require fabricated heads
4.3. Lubrication
Open lineshaft (usually)
Pumped fuid provides the lubrication
Closed lineshaft is usually lubricated by oil
Finally...
Certifcations
NSF-61 for safe use in drinking water
ISO 9001 for quality control
Hydraulic Institute for performance standards
Materials
No-lead is here to stay
Sometimes stainless steel makes sense
Questions?

Thank you for your attention!

Brian Gongol

DJ Gongol & Associates

515-223-4144

brian@gongol.net

@djgongol on Facebook and Twitter

www.gongol.net or www.djgongol.com
Credits

Saturn from NASA

https://www.nasa.gov/jpl/cassini/pia18295

Bedrock aquifers from Iowa Geological Survey

https://www.iihr.uiowa.edu/igs/silurian-devonian-aquifer/

San Francisco real estate (retrieved Feb. 1, 2018):

https://www.trulia.com/real_estate/San_Francisco-California/market-trends/

Drawdown graph and photo of well in a parking lot from USGS

https://pubs.usgs.gov/sir/2010/5212/pdf/sir2010-5212.pdf

Many photos, drawings, and engineering data items were supplied courtesy of
National Pump Co. for the purposes of this presentation

Other photos and illustrations are the original work of the author and all rights
are reserved

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