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Why Pumps Need Pressure Gauges
Published:2013-12-30 10:54:31    Text Size:【BIG】【MEDIUM】【SMALL
In many pump applications, pressure gauges are not used to monitor the equipment and process flow. The operator has no idea if the pump is functioning as designed or as needed for the application. Before long, the pump may become a high-maintenance item. Why do so many pumps operate without proper monitoring?

A set of digital pressure gauges will indicate if a pump is healthy or sick. How? The gauges will show the pressure differential between the suction nozzle and the discharge. That differential should match the psi for which the pump was designed, its best efficiency point.

Investing in the right instrumentation to keep pumps up and running is worth it, especially when considering the cost of down time.

For example, if the pump was designed for 80 feet of head, it should be outputting 34.6 psi (80 feet / 2.31 = 34.6 psi) above the suction pressure. If the digital gauge at the suction nozzle reads zero, then the discharge pressure gauge should read 34.6. If the suction gauge reads 25 psi, the discharge gauge should read 59.6 psi. If the discharge pressure is not right, either the system or the pump needs to be adjusted to run optimally. This will prevent many problems—including cavitation—helping the pumps’ bearings and mechanical seals last for many years. Before end users can make the right changes to their pumps, first they need to understand how well the pump is operating. Good pressure gauges can provide this knowledge.

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