NPDC – Waitara Milliscreen Refurbishment

NPDC – Waitara Milliscreen Refurbishment

Contract Value: $100K

Contact our Infrastructure Engineering team today!

Reece Lloyd

Reece Lloyd


E: reece.lloyd@maxtarr.co.nz
M: 027 455 5576


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Nick Reid


E: nick.reid@maxtarr.co.nz
M: 027 324 3114

Mask Group 21

Dylan Buckingham


Contact our Industrial team today!

Mask Group 9

Max Tarr

Executive Director

E: max.tarr@maxtarr.co.nz
M: 027 495 2468

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Jonathan Hogg

Industrial Manager

E: Jonathan.hogg@maxtarr.co.nz
M: 027 444 2054


Michael Hoggard

Project Manager

Contact our Commercial team today!

Dean Berendt

Dean Berendt

Commercial Manager

E: dean.b@maxtarr.co.nz
M: 022 639 3644


Andrew Tokley

Project Manager
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Tony Boerboom

Fire & Security Supervisor

E: tony.boerboom@maxtarr.co.nz
M: 027 497 5697

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NPDC engaged Max Tarr to initially undertake a condition assessment of an older Rotoshear Milliscreen at their Waitara Wastewater Pump Station that had been out of service for a few years. We completed the inspection and provided a condition assessment and recommendations for bringing the screen back into service. Included in our recommendations were some improvements to be made to their 2 other newer Contrashear Milliscreens to get the incoming flows balanced and allow for easier maintenance on the sparge spray system. NPDC then engaged us to undertake our recommended works which included the improvements to the Contrashear Milliscreen.

The work comprises the following components:

  • Site Inspection, condition reporting and improvement recommendations for the Rotoshear Milliscreen and Contrashear Milliscreen
  • Removal of Rotoshear Milliscreen and transport back to our Palmerston North Workshop
  • Design and fabrication of new support frame based on existing frame.
  • Design and manufacture new trunnion wheels
  • Replace front and rear drum ends and repair wedgewire drum
  • Replace drive motor and gearbox including new chain and sprockets
  • Supply and install new automatic oiler system
  • Replace drum stabiliser
  • Replace sparge spray nozzles and repair sparge covers
  • Lower internal weir level
  • Reinstall Rotoshear Milliscreen

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