Chesterton 442 Seals on Ultra Fine Grinding Mills, Gold Mineral Processing

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A customer was experiencing frequent gland failures on an Xstrata UFG 5000 Isa Mill™. Although it was a slow turning mill and low pressure, it was difficult to maintain a suitable seal with conventional gland packing. This was an acute and chronic maintenance event, impacting and causing a bottleneck in production of the plant, representing an annual downtime of more than 85 hours.


A review was undertaken of similar failure modes affecting pumps throughout the mill which was followed by close liaison with PUMPNSEAL Australia to engineer a suitable mechanical seal solution. Based on the earlier success of operating Chesterton Split seals in slurry pumps in higher head applications it was considered worth a trial. A 360mm standard version of the 442 seal was installed when the mill was scheduled for regular maintenance. The initial installation which took 2 hours eventually resulted in the elimination of further seal and bearing failures due to water contamination.

Features and Benefits of using Chesterton 442 Mechanical Seals:

  • No Failures. Seal failures reduced to zero
  • Planned 18-month maintenance program to inspect mechanical seal
  • Reduced gland water usage
  • Increased availability has provided an additional 1600oz of gold per annum
  • A sustainable unit cost saving of $2.56/oz directly in the bottleneck (revenue stream)

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