Chemical Engineering March 2016 - 33

for immersed bearings, providing
indefinite dry-run capability and dependable
operation. These pumps,
which are available in corrosionresistant
thermoplastics, are specified
for applications in which brief
or long-term stoppages of fluid may
occur, as well as for applications in
which regulations prohibit draining
tanks from the bottom.
Ease of maintenance
" Processors need to be able to keep
their processes running as close to
continuously as is possible, so there
is a strong push in the industry for
pumps with low lifetime costs, easyto-maintain
designs and extremely
low downtime, " says John Dean,
NPa Business Field manager for
Chemical, Pulp and Paper with Netzsch
North america (Exton, Pa.; www.
netzsch-pumps.com).
To decrease downtime and simplify
maintenance, Netzsch offers Full
Service-In-Place, or FSIP, versions of
its rotary lobe and progressing cavity
pumps. " For a long time, progressing
cavity pumps had to be detached
from their outlet piping to be serviced,
but with the FSIP design, all parts of
our NEMO progressing cavity pumps
can be maintained or replaced without
disturbing the piping. "
additionally, the company's Tornado
T2 rotary lobe pump (Figure 3)
was developed with the FSIP concept.
The T2 has the same operating
concept as other rotary lobe pumps,
but instead of featuring elastomer
lobes that wear out quickly and require
time-intensive repair or replacement,
the T2 features an elastomer
housing liner and steel lobes. " The
design change reduces maintenance
frequency, " says Dean. " Because the
pump can be fully serviced through
its front cover and features a timing
belt instead of timing gears to eliminate
the need for oil changes, the T2
can provide more uptime than other
rotary lobe pumps. "
Withstand harsh environments
" One of the biggest challenges when
supplying pumps into the chemical
processing industry is the ability to
provide pumps and materials that
will last, given the chemicals and
chemical concentrations of these
demanding applications, " says William
Parry, manager of engineering
with CECO Environmental's Global
Pump Solutions Group (Cincinnati,
Ohio; www.cecoenvironmental.
com). " Pumps need to survive in
process conditions that may include
high concentrations of sulfuric acids,
high concentrations of basic solutions
and a range of other corrosive
or destructive environments. "
The answer to this issue is in the
use of specialty materials. " Often,
non-metallic pumps are the only solution
in these environments, " says
Parry. The company's Fybroc fiberglass-reinforced
pumps are offered
in multiple resins for a broad range of
applications to solve corrosion problems.
They feature high-quality and
high-purity vinyl ester/epoxy resins to
meet a range of corrosion-resistant
applications. Offerings include pumps
with synthetic veil for resistance to
hydrofluoric acid, materials to handle
moderate to heavy abrasives, special
catalyst systems for handling strong
bleaches, special resin systems to
meet u.S. Food and Drug admin.
(FDa) specifications and secondgeneration
epoxy resins for certain
acid and solvent combinations.
High temperatures are often another
consideration when selecting
utility pumps for CPI applications.
" Typically in chemical applications we
aren't pumping water, " explains Keith
Grgurich, director of sales with BJM
Pumps (Old Saybrook, Conn.; www.
bjmpumps.com). " Rather, it's liquids
that have a high volatility or they are
hot or they have a very high specific
gravity. any of these conditions support
using a pump end that's down
in the liquid rather than on top, so we
have had to perfect the use of a submersible
pump for use in chemical
environments, and what we've come
up with is a high-endurance, hightemperature
submersible pump. "
BJM's Fahrenheit pumps can operate
in environments where the liquid
is up to 200°F, and are available
in both cast iron and stainless steel.
The innovation comes from the design
of the motor, which is protected
by double mechanical seals. The
lower seal is made of silicon carbide/
silicon carbide and the upper seal
is made of carbon/ceramic. an adChemiCal
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Circle 4 on p. 90 or go to adlinks.chemengonline.com/61493-04
33
0302201616
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