The Experts below are selected from a list of 9 Experts worldwide ranked by ideXlab platform
John Griffith - One of the best experts on this subject based on the ideXlab platform.
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multistage pump efficiency gains through the elimination of the Seal Chamber Pressure equalization line
2004Co-Authors: Trey Maxwell, John GriffithAbstract:The majority of horizontally split multistage pumps were designed when packing was the only cost effective method of Sealing the pumpage from atmosphere. As a result, even modern pumps employ a stuffing box Pressure equalization line (balance line) to lower stuffing box Pressures. This technique of Pressure equalization has a major drawback: reduced pump efficiency. The work that is done on the fluid that is throttled back to suction through the balance line is lost and acts to reduce the useful work done by the pump. While this was an acceptable compromise in the 1950s, it is now a true waste of very expensive electrical power. The modern solution to this problem is to eliminate the balance line and apply a correctly specified mechanical Seal to the high Pressure side of the pump. This paper serves to show that, with careful consideration of the effects of balance line removal, pump life can be maintained and efficiency gains achieved.
Trey Maxwell - One of the best experts on this subject based on the ideXlab platform.
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multistage pump efficiency gains through the elimination of the Seal Chamber Pressure equalization line
2004Co-Authors: Trey Maxwell, John GriffithAbstract:The majority of horizontally split multistage pumps were designed when packing was the only cost effective method of Sealing the pumpage from atmosphere. As a result, even modern pumps employ a stuffing box Pressure equalization line (balance line) to lower stuffing box Pressures. This technique of Pressure equalization has a major drawback: reduced pump efficiency. The work that is done on the fluid that is throttled back to suction through the balance line is lost and acts to reduce the useful work done by the pump. While this was an acceptable compromise in the 1950s, it is now a true waste of very expensive electrical power. The modern solution to this problem is to eliminate the balance line and apply a correctly specified mechanical Seal to the high Pressure side of the pump. This paper serves to show that, with careful consideration of the effects of balance line removal, pump life can be maintained and efficiency gains achieved.
Angel Custodio - One of the best experts on this subject based on the ideXlab platform.
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Basic pump principles
Know and Understand Centrifugal Pumps, 2003Co-Authors: Larry Bachus, Angel CustodioAbstract:This chapter explains the basic principles and the working mechanism of a pump. This chapter also discusses the Pressure displacement (PD) pumps and the centrifugal pumps. Pumps are used to transfer liquids from low-Pressure zones to high-Pressure zones. PD pumps perform work by manipulating the available space inside the pump. Centrifugal pumps perform work by manipulating the velocity of the fluid as it moves through the pump. The details about the mode of measuring Pressure and atmospheric Pressure, absolute Pressure, gauge Pressure, vacuum, pump head, and specific gravity are also discussed in the chapter. Each entity is explained with the formula for measuring the same and the relation. The Pressures inside the pump, namely, suction Pressure, discharge Pressure, Seal Chamber Pressure are also explained. Head versus Pressure principle is explained with the help of diagrammatic representation. In this chapter, one can also study the total head, suction head, discharge head, and suction lift. The footnotes of two authors explain the vacuum and confusion regarding head versus Pressure that exists between maintenance people and the pump manufacturer. Each concept is explained using appropriate diagrammatic representations, which help comprehend the basic principles of pump with ease.
W.e. Bill Forsthoffer - One of the best experts on this subject based on the ideXlab platform.
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8 – Mechanical Seals
Forsthoffer's Rotating Equipment Handbooks, 2020Co-Authors: W.e. Bill ForsthofferAbstract:Publisher Summary This chapter discusses the function and types of mechanical Seals. Mechanical Seals are commonly specified for centrifugal pump applications. The mating faces of each member perform the Sealing. The mating surface of each component is highly polished and they are held in contact with a spring or bellows which results in a net face loading closure force. The amount of heat generated at the Seal face is a function of the face loading and friction coefficient, which is related to material selection and lubrication. The simple Seal system incorporates an orifice in the flush line from the pump discharge to the mechanical Seal. Its purpose is to limit the injection flow rate to the Seal and to control Pressure in the Seal Chamber. An indication of some causes of Seal failures can be obtained while the Seal is operating. Tandem mechanical Seals are used in applications where the pumped fluid is toxic and/or flammable. They consist of two mechanical Seals. The primary Seal is flushed by any selected Seal flush plan. The back-up Seal is provided with a flush system incorporating a safe, low flash point liquid. The chapter discusses the high temperature product flush system which is desirable to maintain the required margin between liquid vapor Pressure and Seal Chamber Pressure.
Larry Bachus - One of the best experts on this subject based on the ideXlab platform.
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Basic pump principles
Know and Understand Centrifugal Pumps, 2003Co-Authors: Larry Bachus, Angel CustodioAbstract:This chapter explains the basic principles and the working mechanism of a pump. This chapter also discusses the Pressure displacement (PD) pumps and the centrifugal pumps. Pumps are used to transfer liquids from low-Pressure zones to high-Pressure zones. PD pumps perform work by manipulating the available space inside the pump. Centrifugal pumps perform work by manipulating the velocity of the fluid as it moves through the pump. The details about the mode of measuring Pressure and atmospheric Pressure, absolute Pressure, gauge Pressure, vacuum, pump head, and specific gravity are also discussed in the chapter. Each entity is explained with the formula for measuring the same and the relation. The Pressures inside the pump, namely, suction Pressure, discharge Pressure, Seal Chamber Pressure are also explained. Head versus Pressure principle is explained with the help of diagrammatic representation. In this chapter, one can also study the total head, suction head, discharge head, and suction lift. The footnotes of two authors explain the vacuum and confusion regarding head versus Pressure that exists between maintenance people and the pump manufacturer. Each concept is explained using appropriate diagrammatic representations, which help comprehend the basic principles of pump with ease.