How to monitor the condition of your liquidyne shaft seal

Liquidyne can be monitored 24/7

The great advantage of the liquidyne is that it’s condition can be monitored 24/7, which means you can predict the remaining lifetime of the seal. With this advantage, you can optimize your pumping process and avoid unnecessary maintenance or sudden pump failure.

How does it work ?

The liquidyne seal was originally developed for heavy duty dredge pumps. The 3-stage vacuum is placed on the pump shaft and consists of three seals, one to retain the dirt, one to reduce the pressure and the actual seal.

The water lubricated liquidyne lip seals run over a partially grooved bush placed over the pump shaft. The helical shape of the grooves and the peripheral velocity of the bush create water flow between the grooves and the lip seal.

Over time, the grooves on the bush gradually wear down. Less water is transported over the bush and the amount of water leaving the drain decreases. By plotting this decrease in drain flow, you can measure the extent to which the seal is worn down.


How to monitor the condition of your liquidyne shaft seal?

1. Monitor the condition of the liquidyne shaft seal

Place a bucket under the drain to collect the water leaving it for about 30 seconds to a minute. Time this with your stopwatch.

2. Drain Flow

Check your liquidyne manual to know what the drain flow should be for the type of liquidyne installed on your dredgepump.

3. Maintenance

The drain flow depends on the type of liquidyne seal installed on the dredgepump. When it’s at 20% of the initial flow, maintenance is required.

Please feel free to contact us or Lagersmit if you have any questions relating to the video above or liquidyne condition based monitoring in general.

Jan Willem
Written by

Jan Willem

Lagersmit Logo Product specialist