By Gravett C., Dann G.

ISBN-10: 075136021X

ISBN-13: 9780751360219

ISBN-10: 0756637694

ISBN-13: 9780756637699

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6 Twin-rotor geared-screw pumps Screw pumps with two screws and an external synchronising gear can handle liquids containing small quantities of solid particles, 2 mm may be possible. Pump users have been looking for pumps which can handle mixtures of liquids and gases, two phase flow. Crude oil production, from some wells, varies considerably with water and CO2/H2S content. Centrifugal pumps can only accept approximately 15% gas percentage by volume before losing prime. Twin screw pumps have been developed to handle continuously variable mixtures from 100% liquid to 97% gas.

49 Submersible sewage handling pump suitable for both dry and submersed installation A pump which can handle crude oil, light hydrocarbon liquid fractions, sour water and natural gases is extremely useful. The pump looks like an extremely rugged version of an axial compressor. The rotor drum is of relatively large diameter and the blade height is unusually short. The rotor stages have few blades but each blade extends for 60 or 70 degrees around the circumference. The casing stages have more nozzles and resemble the high pressure nozzles from a steam turbine.

13. Typical of immersed installation pumps, at least for the larger sizes, is that the delivery connections and mounting plates are located according to each particular installation, if the total height of the pump exceeds the available height required for assembling and disassembling then the support and the delivery pipe as well as the shaft may be divided into segments. For long shafts it is necessary to fit intermediate bearings to prevent vibration and to increase critical speeds. There is a clear trend towards replacing extended shaft pumps with submersible pumps in the smaller sizes.

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Castle (DK Eyewitness Guides) by Gravett C., Dann G.

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