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?
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Good suction piping design must eliminate air entrainment in the liquid, minimize friction loss, provide straight and uniform flow at the pump inlet and avoid excessive forces due to pipe strains at the pump.
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.
Reducing the causes of friction and choosing the proper pump will increase efficiency and cost-savings.
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
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?
Two readers responded to “Thermal Stress Affects Pipe Forces on Pumps”.
Two decades ago, EST Associates, Inc. started operations in Needham, Mass., to provide the New England area with environmental sampling and related monitoring services.
Last month, we discussed applications of low head axial flow pumps ("Field Testing: Theory vs. Reality," Pumping Prescriptions, May 2007). Knowing your system is very important for these types of units. For example, consider a recent application where neglecting the system caused problems.
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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
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?
Two decades ago, EST Associates, Inc. started operations in Needham, Mass., to provide the New England area with environmental sampling and related monitoring services.
Last month, we discussed applications of low head axial flow pumps ("Field Testing: Theory vs. Reality," Pumping Prescriptions, May 2007). Knowing your system is very important for these types of units. For example, consider a recent application where neglecting the system caused problems.
We will start with the basic formulas to calculate the velocity through the pipe of a given inside diameter D, and flow, Q.
New heat activated epoxy-based materials are now being used to repair leaking and corroded pipe work when operations are unable to shut down.
Industrial processes that manufacture, transfer, and distribute a variety of liquefied natural gases, from propane to oxygen to ammonia, require components to protect both the piping system and the pipe supports from the extremely cold temperatures. Pipe supports and piping that are not insulated may become brittle and crack, posing high risk to the piping and structural components.
This past summer I received a suggestion from a Pumps & Systems reader to discuss siphons and their effect on pump head and pipeline flow. If you are like me, your first experience with one of these devices probably led to your first - and hopefully last - taste of gasoline. The siphon is an example of a natural and extremely simple machine that we take advantage of daily.
Polyurethane coating technology is commonly chosen for demanding exterior applications such as bridges, stadiums and other large structures. When maintenance was required inside the Hammond Water Filtration Plant in Hammond, Ind., a moisture-cured polyurethane system proved the only way to coat more than 35,000- sq ft of piping and valves.
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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.
