JOWA PES -Propeller Shaft Earthing System
High efficiency silver tracked basic system
Remote indicator for permanent supervision
Patented continuous slip ring cleaning device
Continuous protection of propeller and bearings at moderate costs
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PES protects the exposed propeller and the shaft bearings against spark erosion damages. It serves as a short circuit between the rotating propeller shaft and the ship’s hull. High efficiency silver tracked slip rings and proven contact brushes ensure a short circuit between the rotating propeller shaft and the ship”s hull.
Several tests in the past indicate that only this material combination ensures a repeatable low conductivity in balance with longer life time. Constant contamination of silver surface increases the risk of spark erosion due to bad contact. Usually the system must be checked every week for cleanliness. Due to low staff and high work load onboard the Slip ring Cleaning Device continuously prevents increase of the residual potential and keeps PES in safe condition over long time.
The effectiveness of PES must continuously be controlled to keep the propeller protected. The remote indicator displays permanently by a two-coloured display about the present condition of the system.