Turbine seal

Monitor power loss and seal health

Purpose

  • Monitor key loss for turbine performance for all production states. 
  • Monitor damage / wear for turbine seal. 
  • (Monitor inflow to cooling basin.) 

 

Reduce downtime caused by damage and corrective maintenance. Improve ability to do preventive maintenance.  

Signals / measurements

Inputs

Quality

How​

Leakage flow turbine upper seal  

1 Hz

Flash counter of the unit’s energy meter.​
Protocol (MQTT etc.)aggr

Atmospheric pressure 

Pressure turbine inlet 

20-200Hz​

Pressure sensor 4-20mA​

Pressure / level turbine outlet 

20-200Hz​

Pressure sensor 4-20mA​

Temperature turbine flow outlet 

Temperature Leakage flow 

Pressure Leakage flow (at temperature measurement) 

Results

Results

Plot 1: Total power loss upper seal 

Plot 2: Power loss due to upper seal leakage flow 

Plot 3: Power loss due to heating of / friction forces on upper seal leakage flow. 

(Plot 4: Total power loss turbine upper / lower seals) 

Technical summary

The upper turbine seal is typically the seal that can be monitored. Lower seal leakage flows tend to exit directly to the draft tube cone making it infeasible to measure this flow.  

Anomalies in water flow and / or temperatures can indicate damaged seals where rotating and stationary components of the seal have come into contact.  

It is not uncommon that upper seal leakage flow is reused for unit cooling. Monitoring of the turbine seal also provides insights into such units’ supply of cooling water. 

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