Columns and Blogs

Since its Nov. 27 meeting, the Organization of Petroleum Exporting Countries (OPEC) has witnessed even more turbulence in the oil market. Prices have dipped as low as little more than $60 per barrel.

Decreasing oil prices have put many companies and countries on edge this month, especially among the members of the Organization of Petroleum Exporting Countries (OPEC).

Last year, “Reduce Thrust and Extend Bearing Life” (Pumps & Systems, December 2013) discussed the benefits and some potential pitfalls of adjusting the axial clearance of American National Standards Ins

For those of you old enough to remember Lawrence Welk, you’ll notice that the title of this brief column is the final quote from his show’s closing song. I am still a loyal fan of his reruns today.

For nearly 22 years, Pumps & Systems has been the leading technical magazine for pump users worldwide, delivering the most comprehensive pumping information across all the process industries.

In my last column (Pumps & Systems, October 2014), I explained that a capacitor’s current is totally out of phase with that of a motor’s magnetizing current.

I received a lot of feedback on my column “How Much Energy Do Pipes Remove?” in the September issue of Pumps & Systems.

Who determines where pressure gauges are located in a pump system? How close to the pump should they be, and what happens if these rules are not followed?

I hope that my last column (Pumps & Systems, September 2014) provided a clearer definition of power factor and how it can be calculated.

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.

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 my July 2014 column, I demonstrated that three-phase voltage variation can significantly affect several alternating current (AC) motor characteristics. If that variation is large, it can also reduce motor life.

When the pump selection process starts, the required flow of the is often the only known variable for an application. For example, a system must move 2,000 gallons per minute (gpm) from a holding tank to another tank or process.

In my June column on pump and motor testing, I said that three-phase voltage variation and unbalance can have a significant effect on motor insulation life. Voltage variation is defined as the difference between the motor nameplate voltage and the incoming source voltage.

One of the supposed advantages of centrifugal pumps when compared to positive displacement pumps is their ability to operate across a wide flow range.

My last two columns (Pumps & Systems, April and May 2014) explained how pump suction behavior depends on how suction pressure is redu

In last month’s column (Pumps & Systems, May 2014), the drawdown analysis portion of the pump and motor field test spreadsheet was reviewed.

As anyone in the Reliant Center could tell you, the oil and gas industry continues to grow. This year’s attendance of 108,300 broke an Offshore Technology Conference (OTC) record.

All pumps should be tested regularly, but wastewater pumps are at the top of the list because they are especially susceptible to changing system conditions.

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.

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