Corrosive, aggressive soil had eaten through a 35 year old ductile iron pipeline in the Port of Tampa area, causing a multitude of leaks that could not be repaired. Replacing the rotten pipe with more iron would have been costly and shortsighted. The radical environment required polyvinyl chloride (PVC) piping.
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Infrastructure is in the headlines again thanks to the Obama Administration and its strategy to help create jobs by rebuilding the nation's roads, bridges and water systems. In fact, renewed interest in infrastructure is so high the American Society of Civil Engineers (ASCE) moved up the release of its Report Card for America's Infrastructure. Unfortunately, the news was not good.
Soils with high concentrations of clay and silt can wreak havoc on construction sites, drain pipes, sewers and pumps. Users working with soils might want to consider geotextiles as a preventive maintenance alternative.
About 900 years before Newton formulated his universal gravitational theory, the Greek philosopher Aristotle espoused something different. He believed that all things had a natural place in the universe, so any object that fell to the earth did so because it had a "need" to return to its natural place. He further theorized that heavier objects would fall faster than lighter ones because they had an even greater need to return. We know now that his theory was a bit off the mark, but had he adapted it to corrosion, it could have described the process quite well.
With continuously increasing energy costs, pump manufacturers must provide energy efficient solutions for fluid transfer. Besides hydraulically optimizing current technology, manufacturers are launching a number of new, highly efficient electrical drives and powerful control systems.
Materials expand when heated and contract when cooled. Pipes are not immune to these laws of nature, so they will also expand and contract with varying temperature.
How many gallons per minute are REALLY flowing out of that pump?
With production time and cash flow at an all time premium, more companies are looking for time and cost saving alternatives to replacing slightly damaged assets.
Today's pipe stress analysis software provides engineers with a tool for designing complete piping systems and performing structural analysis in compliance with ASME and other well-known piping codes. The typical PC-based software is easy to use with spreadsheet inputs and quick reporting. It has facilitated the design to analyze iteration cycle and enabled the engineers to quickly create better and more reliable piping systems.
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Two readers responded to “Thermal Stress Affects Pipe Forces on Pumps”.
Editor's Note: Due to the high number of responses from our readers for more information regarding valve applications in "Surge Control in Pumping S
Soils with high concentrations of clay and silt can wreak havoc on construction sites, drain pipes, sewers and pumps. Users working with soils might want to consider geotextiles as a preventive maintenance alternative.
With continuously increasing energy costs, pump manufacturers must provide energy efficient solutions for fluid transfer. Besides hydraulically optimizing current technology, manufacturers are launching a number of new, highly efficient electrical drives and powerful control systems.
How many gallons per minute are REALLY flowing out of that pump?
Today's pipe stress analysis software provides engineers with a tool for designing complete piping systems and performing structural analysis in compliance with ASME and other well-known piping codes. The typical PC-based software is easy to use with spreadsheet inputs and quick reporting. It has facilitated the design to analyze iteration cycle and enabled the engineers to quickly create better and more reliable piping systems.
Consider a typical ANSI-dimensioned 1x1.5-6 pump, as discussed in the P&S August article. The performance curve showed the BEP flow at around 100 gpm. The ANSI designation 1x1.5 means that the discharge flange is 1 in and suction 1.5 in. Why and how do manufacturers select such dimensions for a particular flow rating? Why did they not select and base their performance coverage charts on a 3x4-8 size for the 100 gpm?
If any silver linings exist for the economic crisis that has gripped the United States since last summer, one is the heightened public and governmental awareness about the nation's need for infrastructure improvements-a situation that American industry had watched grow without proper attention in recent years.
Have you ever wondered why the pressure exerted by a column of liquid has absolutely nothing to do with its volume or, for that matter, the geometric shape of its container?
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The performance of a centrifugal pump with a trimmed impeller will follow the affinity laws as long as that trim is relatively small.
Standards for repair will begin with a standard for vertical turbine pumps.The pump industry is undergoing renewed interest in the technical aspects and quality of repairs.
Charlie Jackson was unaware of any centrifugal pump manufacturer that knew how to calculate hydraulic axial thrust produced within liquid ends of their pumps.
