News Archive
Issue 3 March 2008
Extend your pumping capabilities…
Getting product into any pump is probably your chief pumping consideration.
If you can do this then most positive displacement pumps will handle
an extensive range of viscous products.
The pressure differential between atmosphere and the pump’s
vacuum (e.g. 14.75 PSI max) is very limited in helping us to push
high viscous product into pump’s suction.
Typically non-Newtonian fluids with high solid content, i.e. sewage
cake, tend to bridge and rat-hole; the result: starvation and cavitation
within the pump.
Pump manufactures have developed pumps with open throat suctions
and bridge breakers. Additionally these pumps often utilise a single
auger feed on the connecting rod for enhanced fill efficiency to
the pumps’ pumping chamber. These methods have proved successful
across thousands of applications and many makes of pumps; however,
as a product’s viscosity and solids content increases the
behaviour of such a fluid generally becomes increasingly difficult
to predict.
This is why, occasionally, plant engineers operating near the limit
of singular auger design pump systems on high solids or super viscous
products experience intermittent pump performance drop-off with
possible wear or breakdown consequences.
Handling the very worst of unpredictable and unforgiving products,
therefore, requires a positive pump feed system that is independent
of the pump’s speed and able to adjust to the fluids’
sensed condition at the pump’s suction. The Twin-Screw Feeder
(TSF) is designed for this demanding type of application.
Twin-Screw Feeder (TSF) from Moyno Inc.
How it works:
- The twin screw feeder has a separate drive; therefore, feed
rate is not locked into the pump’s own RPM. By using a pressure
sensor and a PID controller, stuffing pressure control can be
automated to the process for consistent feed pressure to the pump
- Your product is physically pulled down into the augers due to
the twin feed augers counter rotation. This pull-down effect is
unique to the twin augers and cannot be duplicated with a single
auger design.
- A positive stuffing pressure is also achieved: the concentric
motion of the augers allows for extremely tight tolerances with
the sidewalls creating a high tolerance pressure tube area for
maximum fill efficiency.
- Product has no opportunity to bridge - side walls to hopper
and chute are vertical - the product falls directly onto the augers.
The twin augers also create a greater width than a single auger,
plus their intermesh action generates a self-cleaning effect,
further eliminating bridging opportunity.
Need more information? Please call (0044) 023 80760000
IFAT 2008 Exhibition- Munich
Moyno Pumps have an ongoing reputation within the United States
municipal industry for providing pumping answers to some of the
most difficult water and waste applications.
Our European and American engineers look forward to discussing
your pumping applications and how unique systems, like the HS, Twin
Screw Feeder, can significantly improve pumping performance, eliminate
breakdowns and reduce your whole-life costs!
Please feel free to pre-book an appointment at our stand and, if
practical, we will ensure the relevant equipment is available for
your review. T (0044) 023 8076 0000 or email rmsales@robn.com
Please find us in the WEF Pavilion, Hall 4, Stand No 5018.
The Robbins & Myers Moyno Ltd team continues to grow in strength…
We are pleased to welcome Paul Crowley to the Southampton Technical
Sales Office. Paul brings over eighteen years’ utilities pumping,
control and systems experience and skills with him.
Having an extra person within our team with such broad, yet in-depth,
knowledge means our abilities to engineer solutions for our customers’
pumping applications grows more diverse and stronger.
Robbins & Myers Moyno Ltd, and its Moyno progressing cavity pump
range, is about true pumping solutions, best pumping performance,
longest reliability and lowest whole-life costs. If you should wish
to re-visit your pumping applications we would be more than pleased
to suggest your best options, ranging from stay-with-what-you’re-using,
subtle changes to your system, to new pump selection. It’s
free to talk! T(0044) 023 8076 0000.
Very best regards
David Johnson
Business Development Manager