Pressing Onward: A Dewatering Blog

4 Signs Your Dewatering System Needs Maintenance

By Michael Stock

One of the best ways to handle maintenance issues is to be proactive, always keeping an eye out for warning signs indicating that your dewatering system's performance might not be up to snuff.

We asked our dewatering experts for some of the most common signs that a dewatering system needs maintenance, and here is what they said...


1. hydraulic issues or leaks

The hydraulic system is one of the core elements of any filter press.

The ability to build and maintain proper hydraulic pressure levels is a key characteristic of a well-functioning filter press. If your filter press is not able to do this, that is a sure-fire sign that it needs maintenance. A lack of hydraulic pressure might be caused by clogged valves or valves with incorrect settings.

If you are experiencing issues with your hydraulic system, it could also mean the hydraulic oil needs to be changed. Our experts recommend doing this once a year or every 2,000 operating hours.

The video below is a demo of our very own Dr. D changing the oil on a J-Press unit.


2. plate shifting issues

A properly functioning filter press should be able to discharge dry filter cakes at the end of each cycle without any problem. If your press can not do this, it might be experiencing issues with the plate shifting system, which controls the movement of individual filter plates.

These issues will look a bit different depending if your plate shifting system is semi-automatic or fully automatic. Trouble with the hydraulic system is often the cause of the plate shifting system issues.


3. controls issues

Filter press controls and their complexity can vary depending on the type of press and how it is used, but typical control steps include:

  • Feeding pump on/off
  • Positioning valves for the correct flow orientation
  • Drying or washing of filter cakes
  • Opening and closing of the press
  • Plate shifting
  • Offline cleaning functions

Because many filter press functions are interlinked and sequential, a controls issue can stop a press mid-cycle or even prevent it from starting at all. A majority of controls issues happen because switches, sensors or individual component controllers are not working correctly.

There are a few controls issues that can be repaired by a skilled maintenance technician. However, our dewatering experts recommend having one of our technicians repair the problem. The repairs can either be done remotely (for some issues) or at your facility.


4. poor performance

There are a few things that could fall under the umbrella of poor dewatering system performance, such as:

  • Low throughput
  • Slow press cycles
  • Sloppy filter cakes

These could be warning signs of a number of issues and might require some further investigation. Resolving these issues might be a simple as cleaning a dirty filter cloth (in the case of sloppy filter cakes) or could require a more in depth fix like replacing a part.

If you have any questions our technicians are always here to help, and can even come out to your facility to take a look at your Evoqua dewatering system. 


Want to learn more about filter press maintenance?

Check out our past blog 5 Most Common Dewatering Service Issues and How to Fix Them or download our free guide - FAQ's for Filter Press Process, Operations and Maintenance.

DOWNLOAD NOWHave questions?  Contact us today!


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