By Lev Nelik
Written by way of one of many world's most popular gurus and teachers on pumps, this quantity covers the layout, software and troubleshooting for progressing hollow space pumps, downhole pumps and mudmotors. there isn't any different quantity supplying this type of finished, easy-to-understand and hands-on insurance of those forms of pumps. As they develop into increasingly more usual within the petrochemical undefined, and different industries, wisdom in their layout and alertness turns into an increasing number of vital for the engineer.
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Additional resources for Gulf Pump Guides: Progressing Cavity Pumps, Downhole Pumps And Mudmotors
Sample text
This is different from a lead, which is an axial distance between two adjacent lobes. For example, for a five-lobed stator, there are five leads per one pitch. You could not, therefore, insert a rotor into a stator and "thread it in," as you would for a screw and a nut. The profile geometries of a rotor and a stator are made differently from those of screws and nuts. The center of a screw always stays lined up with the center of a matching nut, but the center of a rotor changes its position along its axis.
They are essentially rotor/stator sections, driven via a long drive shaft (in sections), or by a submersible motor. Power sections (which are actually pumping sections for downhole pumps) are supplied unthreaded by the subvendors, for subsequent completion by the "string" manufacturer. This commercial practice is part of a tradition, history, and culture in the oil industry dating back many years. PC pumps have a low "lobe ratio" (to be discussed in detail in Chapter 4), such as 1:2 (a one-lobed rotor inside of a two- lobed stator), although 2:3 lobe ratio designs have recently been introduced.
A single lobe rotor inside a two-lobed stator); there are some 2:3 ratio pump designs, but those are rare. Mudmotors, on the other hand, are usually multilobe designs with lobe ratios as high as 9:10. Since the stator of the 1:2 ratio design has two lobes, all previously derived formulas for multilobe cases apply to it. However, a rotor cross section is different. , d^ = D m ). A major diameter does not exist in the same sense as for multilobe configurations, where the major and minor diameters are in the same crosssectional plane.