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Pump Quiz--Test Your Knowledge Home Of Piranha Pumps www.piranhapumps.com |
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Piranha Pumps Are Made By: Equipment Specialties Company To Contact Us: Phone: (505) 822-0449 Fax: (505) 858-0171 Click Here For Information Request Form |
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The answer is C: Check the direction of the "start kick" to be sure that it matches the direction of the "start kick" arrow on the nameplate. If you answered B, pumps usually draw high amps in reverse rotation, but not always. On any three phase (and most single phase) electric pump, there is a 50/50 chance of connecting the pump in reverse rotation whenever electrical connections are made. Nearly all submersible pump manufacturers provide a visible indicator arrow somewhere externally on the pump. This arrow indicates either direction of rotation or direction of kick. Be careful not to confuse one with the other. A centrifugal pump connected in reverse rotation will pump water. The fact that water is flowing out your discharge is not an indication of correct rotation. A pump running in reverse rotation may have any or all of the following characteristics: draw excessive amperage, excessive motor heat, excessive impeller vibration, excessive rotor shaft deflection, excessive impeller & mechanical seal wear, and it will fail in a relatively short period of time. |
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This impeller demonstrates text book reverse rotation wear patterns. Notice the V shaped notches eroded from the back outside edges of the impeller vanes. Also the top edges of the vanes are rounded on the wrong side and there are square edges on the leading edges that should be rounded from . |
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V Shaped Notches |
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Impeller Vane Rounded On The Wrong Side |
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This is the leading side of the impeller vane where the wear should be. Notice the squared edge and the absence of wear. |
