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Despite their simplicity, centrifugal pumps often experience repeat failures that even seasoned maintenance and reliability professionals have trouble preventing. This four-part series explains the reasons behind repeat pump failures and uses a real-world field example involving boiler feedwater pumps.

Most homes built before 1970 are connected to a sewer through a gravity sewer system. A gravity sewer system collects wastewater from homes and transports it to a collection line by allowing gravity to force the flow. Collection lines are pipes that are installed at a slope to keep both water flowing and solids in suspension.

The Jordan, Knauff & Company (JKC) Valve Stock Index was up 9 percent during the last 12 months, staying under the broader S&P 500 Index, which was up 13.1 percent. The JKC Pump Stock Index was up 19.1 percent for the same time period.1

The waterfalls in the National September 11 Memorial & Museum cascade forever.

To eternity.

When facilities—whether paper mills, refineries, or chemical or waste treatment plants—decide to implement pump system improvements, the first question is always the same: Where to begin?

Rural wastewater utilities rarely, if ever, consider upgrading to an automated control system. Obtaining funding approval in ever-tightening budgets has always been a hurdle, but the real barrier is the lack of information technology support.

Power factor (PF) is an important component of an alternating current (AC) circuit, but understanding its actual effect can be difficult. Why is PF mysterious to many of us? It has to do with the way it is explained.

Several years ago, the Environmental Protection Agency (EPA) began an initiative to control excessive nitrogen and phosphorus pollution entering the Gulf of Mexico through watersheds. Although phosphorus and nitrogen are nutrients needed for aquatic plant and algal growth, excess amounts can have damaging effects. Farming states were under pressure to restore their surface water quality.

Life-cycle cost calculations for wastewater installations can produce huge savings over time for wastewater companies. The life-cycle costs summarize the total cost of a wastewater installation, and the pump system plays a major role. It is the key element to ensuring the installation’s long-term cost-effectiveness.

A multistage BB5 diffuser machine in oil transfer service in the Middle East had been in operation for many years without problems. After a routine maintenance strip down and rebuild, the pump experienced a high thrust bearing temperature of 105 C, which caused it to alarm and shut down. The temperature range had previously been 75 C to 85 C.

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Columns

Power factor (PF) is an important component of an alternating current (AC) circuit, but understanding its actual effect can be difficult. Why is PF mysterious to many of us? It has to do with the way it is explained.

In past “Pumping Prescriptions” columns this year, I have discussed the procedure of piping size selection when given the process flow requirement and how this affects the pump’s power consumption. In this column, two computer calculation tools will be detailed.

A reciprocating power pump, as depicted in Figure 1, is a displacement machine. It has characteristics that are different than a centrifugal pump.

Blogs

The global water crisis claims 5,500 lives each day—more than war, natural disasters, AIDS or hunger. It is a sobering problem but not an impossible one to solve.

Beautiful, inspiring, even haunting—these are some of the words that describe the National 9/11 Memorial fountains in New York.

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