Many pump challenges were overcome, deficiencies
eliminated, and improvements made through
Albemarle and the OEM working together.
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GREAT PUMPS. GREAT PEOPLE.
At this time, we decided internally
to seek other pump alternatives through
other technologies, such as mag-drive
pumps, since there were several successful installations of mag-drive pumps in
the same corrosive liquid service. Upon
deciding to seek other alternatives
for pumps, the Albemarle purchasing
group notified the OEM there would
be no further upgrades of their pump
line since they were not supporting
the needed improvements in their own
product line.
A new product manager at the
OEM was taking the reins of the PFA
lined pump and apparently did not
appreciate the problems or the historical
difficulties with their older product line.
Finally, after several more meetings with
the OEM’s management team and the
Albemarle corporate purchasing team,
the new impeller design was rolled out
to the rest of the product line by the
OEM.
Short Lived Success with the OEM
As the dust cleared from solving the
root causes of the impeller problems
with the recesses in the balance holes,
it became apparent that the mechanical seals on the pumps were also having
issues. In one instance, the pump completely stopped pumping. When it was
torn down and analyzed, the entire
inner metal core was corroded away by
the process fluid.
After examining the possible causes
of failure, the O-ring to shaft seal was
suspected as the main area of concern.
Other pump impellers were inspected
and found to have a large gap between
the shaft and the PFA lining shoulder at
the bottom of the O-ring groove. The
gap was so wide on some impellers that
the O-rings supplied by the seal vendor
would simply slide down between
the shaft and the lining into the gap,
