Summary
The use of specific speed and the
suction specific speed for various
classes of pumps is a time-honored tra-
dition and an established method to
compare different types and groups of
pumps. Even if you don't use these defi-
nitions on a frequent basis, knowing the
derivation of each term and understand-
ing how each one relates to the unique
characteristics of pumps is an important
ability.
Until next month, work safe and
smart.
Figure 3. Chart for estimating pump efficiency.
WWJ October 2016 53
Twitter @WaterWellJournl
Ed Butts, PE, CPI, is the chief engineer at
4B Engineering & Consulting, Salem, Oregon.
He has more than 40 years of experience
in the water well business, specializing in
engineering and business management.
He can be reached at epbpe@juno.com.
DACUM Codes
To help meet your professional needs,
this column covers skills and competen-
cies found in DACUM charts for drillers
and pump installers. PI represents the
pumps chart. The letter and number
immediately following is the skill on
the chart covered by the column. This
column covers:
PIC-5
More information on DACUM and the
charts are available at
www.NGWA.org.
WWJ
