The small diameter of the casing in which these pumps must be run severely limits design options. Length must be substituted for diameter to achieve the needed characteristics, and the motor design of the electric submersible pump barely resembles its surface counterpart. Single-motor assemblies range up to 32 ft (9.8 m) in length, and when power requirements exceed that of a single motor, two or more motors are assembled in tandem. The pumps must use many stages in order to gain the required head. The smallest-diameter pump—3.75-in (95.2-mm) OD—has 166 stages in an overall length of 12 ft (3.7 m). In deeper wells, two or more of these units can be assembled in tandem to gain the needed head. Manufacturers catalog pump combinations with as many as 400 stages. Table 6 gives typical data on the more common sizes. The numbers in the table are not limits, and manufacturers have available both smaller and larger sizes than those shown.

Survival Treasure

Survival Treasure

This is a collection of 3 guides all about survival. Within this collection you find the following titles: Outdoor Survival Skills, Survival Basics and The Wilderness Survival Guide.

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