By Richard Beverly
Pumps are the most costly a part of a water process to function and will be very pricey to fix or change after a failure. right pump choice and operation is vital for lengthy carrier existence. This guide is in particular written to supply operators, engineers, and upkeep employees with a brief reference on deciding on, working, troubleshooting, and retaining all kinds of pumps.
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Extra info for Pump Selection and Troubleshooting Field Guide
For discussion purposes, the pump motor is assumed to operate at 1,750 rpm. Having selected a pump based on the design information discussed previously does not mean that it is the proper pump for a specific application. Pumps are often used to operate away from the design point by either throttling back to a lower flow or reducing pressure and allowing them t o run at a higher flow rate. In that case, the shape of the impeller curve may have a significant impact on the suitability of the pump to operate within the requirements of a particular system.
Pressure created by the pump can cause these bubbles to collapse, creating a knocking or tapping sound on the discharge pipe. Formation and collapse of the air bubbles can, in turn, cause pitting and excessive wear on the inlet side of the pump and impeller. Causes of cavitation include too high of a flow rate, which means the pump is operating too far to the right on its curve, or restrictions in the inlet piping, causing the pump to exceed its NPSH requirements, which can also result in overheating and pump failure.
However, grit can eventually cause them to leak, which may in turn create excessive wear and vibration. Therefore, if mechanical seals Copyright (C) 2009 American Water Works Association All Rights Reserved Pump Troubleshooting 63 are provided, a fresh water flush is recommended for the pump to help keep the seal clean and free of grit. In either case, whether using packing or mechanical seals, a frame-mounted pump should be provided with a drip shield and tubing to the nearest floor drain to keep the area clean and dry.
Pump Selection and Troubleshooting Field Guide by Richard Beverly