Pumping of liquids

Pumping of liquids is almost universal in chemical and petrochemical processes, The many different materials being processed require close attention to selection of materials of construction of the various pump parts, shaft sealing, and the hydraulics of the individual problems. A wide variety of types and sizes of pumps have been developed to satisfy the many special conditions found in chemical plant systems however, since all of these cannot be discussed here, the omission of some does not mean that they may not be suitable for a service. 

In general, the final pump selection and performance details are recommended by the manufacturers to meet the conditions specified by the process design engineer. It is important that the designer of the process system be completely familiar with the action of each pump offered for a service in order that such items as control instruments and valves may be properly evaluated in the full knowledge of the system. 

This chapter presents information on rating, sizing, and specifying process pumps. The emphasis will be on centrifugal pumps, which are by far the most widely used in the process industries however, applications of other types of pumps will also be discussed (see Table 3-1). 

To properly accomplish a good and thorough rat-ing/sizing of a centrifugal pump, the plant system designer should at a minimum  

understand the mechanical details required for a pump to function properly in a system. 

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Due to the nature of batch operations, transferring and charging of process materials is a common activity. This can entail gas, liquids, and/or solids handling via open equipment. This may include pumping of liquids from drums or dumping of solids from other containers into an open vessel, shoveling material into a dryer, or making temporary connections such as at hose stations. 

Pumping of liquids. Compression of gases Mixing (solids, liquids, gases possibly multiphase) Atomization, dispersion... 

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