Electrostatic Discharges

  • Discharges in filter element

  • Discharge at a tooling machine

  • Discharge outside of the system

  • Discharges in hydraulic tank

If a low conductive fluid flows through a conventional hydraulic or lubricating oil filter element, the liquid can get highly charged due to charge separation effects. When exceeding a certain limit, the charge can suddenly be balanced by electrostatic discharges. These discharges can occur in different ways and at different points. The most obvious form is a spark discharge outside the system or in the tank. Discharges within the filter element can usually be heard by cracking noises (similar to cavitation).

Dangers from discharges

  • Burned filter element

  • Increased formation of oil degradation products

  • Interference of electronic components

  • Burned breather filters

Electrostatic discharges in the system can be very dangerous:

  • Burned or blocked filter elements
  • Increased and accelerated formation of oil degradation products (varnish) and hence increased component wear as well as shorter oil service intervals
  • Interference of electronic components
  • Deflagrations in the tank, burned breather filters


A safety concern for equipment operators and system components 

If discharges should occur external of the system, arcing can occur in open space which presents a health hazard to system operators as described in the “Technische Regel für Gefahrstoffe” (TRGS 727) Guidelines. For example, when static electricity results in discharges on the order of 12 mm in length (energy > 350 mJ) a hazard for employees exists as described in TRGS document.


Safety of the working environment is jeopardized!

The Solution: Stat-X®

By using the innovative Stat-X® element technology, you can demonstrably reduce electrostatic discharges and high oil charges even in extremely critical systems with excellent fine filtration.

Your advantages:

  • Maximum safety for employees and machine due to proven reduction of electrostatic arcing, especially under cold start conditions
  • Reduction of oil degradation products (varnish) and longer oil service intervals
  • Safe operation in explosive atmosphere
  • Reduction of unplanned downtimes
  • Reduction of maintenance costs and longer maintenance intervals
  • Maximizes the lifetime of the system

Application Examples


Discharges in hydraulic tank of an excavator:

Application examples:

  • Construction machines (excavator, wheel loader, road roller, finisher,…)
  • Agricultural machines (tractor, harvester,…)
  • Municipal machinery (road sweeper, equipment carrier,…)
  • Forestry machinery (harvester, skidder, forwarder,…)
  • Lifting and material handling (lift trucks, cranes, lifting platform,…)
  • Mining machines (dump trucks, excavator, crusher,…)


Charging in lubricating system of a steam turbine:

Application examples:

  • Combined cycle power plants
  • Gas power plants
  • Nuclear power plants
  • Hydroelectric power plants
  • Wind power plants
  • Industrial turbines


Charging in lubricating system of a turbine:

Application examples:

  • Oil and gas – offshore (HPU, compressors, subsea systems,…)
  • Oil and gas – onshore (compressors, pipeline management,…)
  • Iron and steel industry (continuous casting line, straightening systems, cutting-off machine,…)
  • Pulp and paper (wet end section, press section, dryer section,…)


Discharges at machine tool:

Application examples:

  • Machine tool
  • Forming machine
  • Injection moulding machine
  • Parts cleaning machine
  • Production systems