shaft earthing device pdf

Propeller Shaft Earthing System PES advantages are :+ + + + high efficiency silver tracked basic system remote indicator for permanent supervision continuous protection of propeller and bearings at moderate costs patented continuous slip ring cleaning device

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via a sliding contact to the wheel set shaft, Our earthing contacts o er good protection equipment companies in the world with more.

Shaft earthing device marine A turning propeller is electrically insulated from the hull by the lubricating oil film in the bearings. Electrical potential is generated between the shaft and the hull. As a result the cathodic protection of the ship will not protect the propeller.

What if Reading Exceeds 50mV (As Per Makers Manual) – Clean surface of slip ring, Remove Brushes from brush holders if u use electric instrument 

Required equipment to comply: • BWCM System. • Water in Oil sensor. • Shaft Earthing Device. • Computerised Planned Maintenance System.

5 MAINTENANCE OF SHAFT-GROUNDING SYSTEMS 1. Always keep the system clear of dust, grease and water. 2. When cleaning the silver bands of grease and dust, a Metal cleaner should be used. 3. When polishing the silver bands, use the glass brush, which is delivered with the system. Never use abrasive cloth, file or othe r abrasives. 4.

Checking the earthing device must be done when the shaft is rotating at sea and should be carried out once a month. Release the earthing brushes from their 

Trouble can be avoided and cathodic protection extended to the propeller if the shaft is properly earthed with a shaft earthing system. The effectiveness of the system should ensure a maximum contact resistance of no greater than 0,001 ohms for water filled bearing and 0,01 ohms for an oil filled bearing.

We recommend installing the shaftline earthing device in as dry, warm, well-ventilated, and easy-to-access environ-ment as possible, preferably close to the engine. If a shaft generator is installed, install the device forward of the gen-erator, i.e. between the generator and the engine flywheel. When installing and maintaining the device

Even on ships fitted with ICCP or sacrificial anode systems, propeller shaft bearings are vulnerable to corrosion. This is because turning shafts are 

Checking the earthing device must be done when the shaft is rotating at sea and should be carried out once a month. Release the earthing brushes from their co ntact with the slip ring; this should give high pulsating voltages of 100- 400 mV reading on the meter. This indicates that the measuring circuit is in order.

A propeller shaft earthing (PSE) system must be installed to avoid damage to the propulsion machinery which results in excessive maintenance 

US 5,454,724 A discloses an electrical machine having an input shaft and an earthing device for electrically earthing the input shaft, the earthing device having a sliding contact for making contact with the input shaft. A disadvantage of this is that the earthing device has a comparatively high resistance, and therefore electrostatic charges on the input shaft are opposed by a comparatively

A rotating body consisting of a rotating shaft and bearings inevitably generates voltage and current. The potential difference between the bearing and the 

This brushgear is connected direct to the Condition Monitor Unit. SHAFT BONDING SHAFT MONITORING (Optional) 1 SLIPRING - Copper/Silver Track TENSION BANDS & CLAMPS - S.S. 4 SINGLE BRUSH HOLDER BRUSH - 1 X 80% AG. INSULATED SPINDLE 2 DOUBLE BRUSH HOLDER BRUSHES - 2 X 80% AG. MOUNTING SPINDLE - S.S. 5 CONDITION METER 3

Shaft Earthing Solutions specialises in the field of shaft earthing for turbines, compressors, pumps, power generators and ship propellors. We supply shaft current and voltage monitors, Sohre shaft riding brushes and also offer on site testing services and training programmes. Our monitors are widely used in both hazardous and non-hazardous

Furthermore, because the grounding brushes also are the coupling point of rotor earth fault protection, reduced grounding functionality can cause false earth 

When the shaft earthing set is working properly, the mV-meter should indicate a value below 50mV. Exceeding the 50mV means malfunction of the PSE system, which may be related to filthy or worn parts, or incorrect installation. Additionally the monitoring set can be supplied with a 4-20mA converter that offers an additional alarm function.