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Search Petrowiki: NPSHA
...Glossary:NPSHA Net positive suction head available...
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... such as rated suction pressure, maximum suction pressure, and net positive suction head available (NPSHA). (See Hydrodynamics for information on ...NPSHA.) Once the available suction conditions have been established, the effect of the selected control s...al type selections, a particular construction style is most influenced by: * Discharge pressure * NPSHA * Fluid temperature * Space and weight limitations * Fluid shearing characteristics Hydraulic p...
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... such as rated suction pressure, maximum suction pressure, and net positive suction head available (NPSHA). (See Sec. 6.2.3 for information on ...NPSHA.) Once the available suction conditions have been established, the effect of the selected control s... general type selections, a particular construction style is most influenced by discharge pressure, NPSHA, fluid temperature, and space and weight limitations. Hydraulics deals with the mechanical propert...
Factors that have the greatest influence on the selection of the most cost-effective pump type include capacity, TDH, maintenance, viscosity, and capacity control. Within the general type selections, a particular construction style is most influenced by discharge pressure, NPSHA, fluid temperature, and space and weight limitations.
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... such as rated suction pressure, maximum suction pressure, and net positive suction head available (NPSHA). (SeeSec. 6.2.3 for information on ...NPSHA.) Once the available suction conditions have been established, the effect of the selected control s... general type selections, a particular construction style is most influenced by discharge pressure, NPSHA, fluid temperature, and space and weight limitations. Hydraulic Principles Introduction Hydrau...
Pumps are used to move fluids, which include liquids, dissolved gases, and solids. Gases include dissolved air and hydrocarbon vapors. Solids include sand, clay, corrosion byproducts, and scale. The most common types of liquids pumped in upstream operations are crude oil, condensate, lube oils, glycols, amines, and water. Each fluid has different physical properties that must be taken into consideration when sizing and selecting a pump. The most important physical properties are suction pressure, specific gravity, viscosity, vapor pressure, solids content, and lubricity. Types of Pumps A pump can be defined as "a mechanical device that adds energy to a fluid to increase its flow rate and static pressure."[1] This process can be accomplished with positive-displacement pumps or kinetic-energy pumps.
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...sary:GLI H * Glossary:HCIIP M * Glossary:MSE N * Glossary:NBR * Glossary:NPSH * Glossary:NPSHA * Glossary:NPSHR P * Glossary:Ped * Glossary:PEl * Glossary:PH * Glossary:Photoionization de...
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...d discharge piping should be arranged as symmetrically as practical so that all pumps have the same NPSHA. Back to top Series operation Series operation is used when a single pump cannot develop the to...
Centrifugal pumps are the most commonly used kinetic-energy pump. Centrifugal force pushes the liquid outward from the eye of the impeller where it enters the casing. Differential head can be increased by turning the impeller faster, using a larger impeller, or by increasing the number of impellers. The impeller and the fluid being pumped are isolated from the outside by packing or mechanical seals. Shaft radial and thrust bearings restrict the movement of the shaft and reduce the friction of rotation. Centrifugal pumps are designed with respect to the: * Number of suctions (single or double) * Number of impellers (single, double, or multistage) * Output * Impellers (type, number of vanes, etc.) Most impellers are arranged from one side only and are called single-suction design. High-flow models use impellers that accept suction from both sides and are called double-suction design. The efficiency of a centrifugal pump is determined by the impeller. Vanes are designed to meet a given range of flow conditions.Figure 1 illustrates the basic types of impellers.
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