Chemical Engineering August 2022 - 41

operating range that is immune to
changing fluid and system conditions.
Furthermore, a wide flow and
pressure range is achievable, potentially
over a smaller equipment model
range, optimizing asset flexibility.
Internal-gear pumps
Today's advanced magnetically coupled
internal-gear pumps (Figure 3)
have a simple design that features
only seven main components. The
heart of the design is a bearing-tobearing
support system that eliminates
leaks. The pump's short spindle
also overcomes the challenges
that are inherent in pump technologies
with longer spindles, namely the
impact of overhung loads that can
lead to premature wear and failure.
Also, unlike centrifugal pumps that
rely on cantilevered bearings, internal
gear pumps have a symmetrical shaft
support, which eliminates shaft deflection
during operation, resulting in
less maintenance and downtime.
Another standout feature of some
magnetically coupled gear pumps is
a single-liquid-chamber design that
improves liquid circulation through
the coupling area. This results in longer
magnet life, lower operating temperatures
and more efficient cleaning
and flushing processes. By comparison,
some gear-pump designs feature
a long, tortuous flow path, which
can raise the temperature of the liquid
as it is being transferred to levels that
can compromise magnet life.
So, now the decision involves a
choice between PD seal-less magdrive
sliding vane and seal-less
mag-drive internal gear pumps.
Table 1 provides some representative
operating information to compare
sliding-vane and internal-gear
technologies, which operators can
use to select the best option for their
specific applications.
Recent advancements in seal-less
sliding vane and internal gear pump
technology provide new functionality,
reliability and flexibility for CPI facilities.
These pump designs are leakfree
and help eliminate pervasive pain
points of legacy technologies that
have been used in CPI applications.
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CHEMICAL ENGINEERING WWW.CHEMENGONLINE.COM
220705 L2201286-Chemical Engineering - adv. - 206.4x142.9mm EN.indd 1
SCAN THIS CODE FOR
MORE INFORMATION
age new options that combine leakfree,
seal-less performance with the
inherent operational advantages that
positive-displacement sliding and
gear pumps possess.
■
Edited by Mary Page Bailey
Author
Geoff VanLeeuwen is the director
of products and applications
for Blackmer and PSG (1809 Century
Avenue SW, Grand Rapids, MI
49503; Phone: 1 (616) 2411611;
Email: geoff.vanleeuwen@
psgdover.com; Website: www.
blackmer.com). He has worked at
Blackmer since 2014 and held
previous roles at Sargent & Lundy
and Innotec. VanLeeuwen is a Licensed Professional
Engineer in Illinois and Michigan. He holds a B.S. in mechanical
engineering from Calvin University and an M.S.
in energy engineering from the University of Illinois Chicago,
along with an M.B.A. from Grand Valley State
University.
Michael Coburn is the product
manager for EnviroGear and PSG,
(1815 S. Meyers Road, Oakbrook
Terrace, IL 60181; Email: michael.
coburn@psgdover.com; Phone:
1-909-422-1731; Website: www.
psgdover.com/envirogear). Coburn
has worked at PSG for five years,
and has over 15 years of experience
in engineering. He holds B.S.
and M.S. degrees in mechanical engineering.
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AUGUST 2022
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Chemical Engineering August 2022

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