3-D laser scanning is a relatively new technology that yields a three dimensional virtual record of a real object. The concept is simple and similar to police radar, but requires the power of modern day computers to collect and process enormous amounts of discrete data instantaneously.
Topic Sponsor
Top Pumps Articles
Pumps & Systems , July 2008
No one would think about buying a car with poor gas mileage or purchasing an inefficient refrigerator. However, companies are purchasing pumps with open-faced impellers, which result in a tremendous loss of pump performance and efficiency. The pump performance and efficiency of an open-faced impeller continues to decrease as the impeller and the pump casing begin to wear. The performance and efficiency of an open-faced impeller is a function of the clearance between the impeller face and the suction volute or plate. A five point reduction in performance on a pump that is operating at 50 percent efficiency will translate into a 10 percent loss of efficiency and will continue to decrease as the impeller and casing housing wear.
Pumps & Systems , May 2008
In trench-type wet wells, the pump intakes are placed near the bottom of a deep, narrow trench coaxial with the inlet pipe but considerably below it (see Figure 1). The closely confining walls of the trench prevent cross currents, which creates a good hydraulic environment for the pump intakes. The trench works very well for both water and wastewater. The ramp shown in Figure 1 is omitted in clear water applications, and the row of pumps starts immediately downstream from the end of the inlet pipe. Pumping stations with capacities in the range of as little as 2.5-Mgal/d to as much as 220-Mgal/d for both water and wastewater are currently in service and performing well. Some of these installations are more than 40 years old with no indication of poor or unacceptable pump performance.
"So easy that even a caveman can do it,” as stated in a popular TV commercial, could easily be used to describe today’s predictive maintenance tools because they work so well.
Cavitation is defined as the phenomenon of formation and consequent implosion of vapor bubbles in a region where the pressure of the liquid falls below its vapor pressure. Cavitation can occur in any fluid handling equipment, especially in pumps.
Editor's Note: This is the third part of a series based on Optimizing Pumping Systems: A Guide to Improved Energy Efficiency, Reliability, and Profitability, written by pump systems experts. This new guidebook continues the mission of Pump Systems Matter TM (PSM) and the Hydraulic Institute (HI) to advance knowledge on pumping systems.
A low-pressure wastewater disposal alternative offers a cost-saving installation solution for wastewater and raw sewage disposal.
Pumps & Systems , July 2008
Air operated double diaphragm pumps (AODDP) require the correct amount of pressure (PSI, pounds per square inch) and air (CFM, cubic feet per minute) to deliver the proper amount of fluid. A typical air operated diaphragm curve shows how the correct amount of pressure and CFM are required to deliver a required flow rate against a discharge head.
Latest Pumps Articles
New resin and Kevlar bulk molding compound adds strength to pump wear parts
Hydraulic Institute has been creating pump standards since 1917
Solid-body plastic AODD pumps deliver the operational ability required for challenging abrasive-handling applications.
Computer-aided engineering enables the improvement of pump hydraulic performance in power plants.
Detuning devices solve high vibration problems in power station water circulating pumps.
Choosing the right enclosure to protect pump monitoring equipment is paramount.
"So easy that even a caveman can do it,” as stated in a popular TV commercial, could easily be used to describe today’s predictive maintenance tools because they work so well.
Charlie Jackson was unaware of any centrifugal pump manufacturer that knew how to calculate hydraulic axial thrust produced within liquid ends of their pumps.
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.
The performance of a centrifugal pump with a trimmed impeller will follow the affinity laws as long as that trim is relatively small.
Industry News
Columns and Blogs
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.
