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
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Readings of ”0” when the shaft is turning at sea, indicates a defective mV-meter or loose or broken cable connections. Checking the earthing device must be done.
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SHAFT EARTHING DEVICE. Without Amplifier. This system is a precautionary measure installed in order to reduce the electrical potential between the.
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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.
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Measure electrical contact between slip ring and shaft at least monthly to reveal any concealed corrosion. If resistance exceeds 5 mΩ: Overhaul the slip ring. •
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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.
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employs some of the best electrical equipment and hull units available, Shaft Earthing System With this system the bearings of the tail shaft.
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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.
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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.
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The shaft earthing assembly comprises a pair of high silver content / graphite compound brushes mounted in balanced brush holder, running on a copper slip ring with solid silver inlay track. Each brush holder has a adjustable spring tensioner which is supplied preset to the minimum, and results in a pressure of 225g/cm2.
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A propeller shaft earthing (PSE) system must be installed to avoid damage to the propulsion machinery which results in excessive maintenance
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800 series available with AEGISTM shaft grounding rings. The encoder need to be pre-prepared with a special encoder shaft in order to permit the mounting of a SGR. As the SGR is somewhat subject to wear are they always mounted outside the encoders enclosure [Figure 5] and can therefore easily be replaced. Thus preventing cur-
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PDF CONE CRUSHER CH SERIES CH440. CONE CRUSHER CH SERIES CH440 Nominal capacities MTPH Chamber EC C MC M MF F EF CSS 110-130 95-110 - - - - - SH 185 155 125 100 75 65-80 -38 TS 215 175 140 110 85 70-85 -42 Max motor power (kW) 220 220 220 220 220 220 - Ecc. hammer mill wearing plate used in hammer mill shaft sleeve adapter hp200 insulation
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Figure 1: Illustration of shaftline earthing device arrangement (courtesy http://www.horizonlines.com/ots/aa%20D8%20Service%20Letters/SL2008-498.pdf.
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It is advisable to use two earthing devices for the shaft of the main engine. One for earthing purpose and the other to connect with the
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What if Reading Exceeds 50mV (As Per Makers Manual) – Clean surface of slip ring, Remove Brushes from brush holders if u use electric instrument
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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.
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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.
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The earthing system is the basis for the safe function of every electrical system and its protection devices. It ensures operation and protects people against
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