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Title: Avoid self-priming centrifugal pump

Abstract

The self-priming horizontal centrifugal pump becomes known to its operator either as a good pump or a bad pump. The latter is usually replaced by another type of pump, even though a properly specified self-priming centrifugal pump might have been a good choice. Use of the guidelines described in this article are intended to help in the purchase and installation of a good pump. Self-priming centrifugal pumps are used for removing liquids from below grade sumps or pits that may also contain solids, fibers and/or muck. Alternate pumps for this service include submersible pumps, vertical turbine pumps and positive displacement pumps. These alternate pumps do not pass solid particles as large as self-priming pumps do without damage. Positive displacement pumps are not normally cost-effective when pumping liquid at rates in excess of 500 gallons per minute in low-head applications. Vertical and submersible pumps must be removed when cleaning of the pump is required. Self-priming pumps are easily cleaned by opening the access plates without moving the pump; and they cost less than the other types.

Authors:
Publication Date:
Research Org.:
Sea Lion Chemical Inc., Texas City, TX
OSTI Identifier:
6679185
Alternate Identifier(s):
OSTI ID: 6679185
Resource Type:
Journal Article
Resource Relation:
Journal Name: Hydrocarbon Process.; (United States); Journal Volume: 66:1
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; CENTRIFUGAL PUMPS; DESIGN; PETROLEUM REFINERIES; CLEANING; COMPARATIVE EVALUATIONS; COST; FLOW RATE; OPERATION; PRESSURE DEPENDENCE; PUMPING; RECOMMENDATIONS; RELIABILITY; SPECIFICATIONS; INDUSTRIAL PLANTS; PUMPS 020400* -- Petroleum-- Processing

Citation Formats

Reeves, G.G. Avoid self-priming centrifugal pump. United States: N. p., 1987. Web.
Reeves, G.G. Avoid self-priming centrifugal pump. United States.
Reeves, G.G. Thu . "Avoid self-priming centrifugal pump". United States. doi:.
@article{osti_6679185,
title = {Avoid self-priming centrifugal pump},
author = {Reeves, G.G.},
abstractNote = {The self-priming horizontal centrifugal pump becomes known to its operator either as a good pump or a bad pump. The latter is usually replaced by another type of pump, even though a properly specified self-priming centrifugal pump might have been a good choice. Use of the guidelines described in this article are intended to help in the purchase and installation of a good pump. Self-priming centrifugal pumps are used for removing liquids from below grade sumps or pits that may also contain solids, fibers and/or muck. Alternate pumps for this service include submersible pumps, vertical turbine pumps and positive displacement pumps. These alternate pumps do not pass solid particles as large as self-priming pumps do without damage. Positive displacement pumps are not normally cost-effective when pumping liquid at rates in excess of 500 gallons per minute in low-head applications. Vertical and submersible pumps must be removed when cleaning of the pump is required. Self-priming pumps are easily cleaned by opening the access plates without moving the pump; and they cost less than the other types.},
doi = {},
journal = {Hydrocarbon Process.; (United States)},
number = ,
volume = 66:1,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1987},
month = {Thu Jan 01 00:00:00 EST 1987}
}
  • A series of self-priming centrifugal pumps was awarded Top Honors in the process pump category of the 1982 Chemical Processing Vaaler competition because the judges were favorably impressed by the high operating efficiency over a wide range of flow conditions, and the easy-to-service design that reduces overall operating costs. The self-priming pumps also offer certain advantages over conventional vertical or submerged pumps in wet pit service. Features for up to 75% operating efficiency include a unique hydraulic design to eliminate the need for close tolerances, a smooth-walled volute casing to minimize friction loss and drag, and a multi-vane open impellermore » that will handle solids up to 1 1/4'' in diameter. The pump can handle varying loads with very little loss of efficiency.« less
  • Integrally-geared, centrifugal compressor packages can provide reliable, efficient and economical operation in process and plant air applications, if properly specified and used. Most compressor packages built today are of very high quality, but the manufacturer, as well as the user, must know and understand the requirements needed for the application. Attention must be paid to the correct selection of compressor design, as well as the choice of options and accessories. Auxiliary components can significantly affect overall utility, performance and efficiency. Methods of avoiding problems during specification and selection, and identifying and correcting some of these problems after installation, are discussed.
  • The transients during startup of a pressure-swing adsorber (PSA) lead to material and energy losses. A dynamic mathematical model is developed to analyze the PSA process to elucidate the conditions under which losses may be minimized. It is based on an ideal binary mixture comprised of components that have linear isotherms. A processing alternative that virtually eliminates losses is suggested. The alternative is formulated by considering the PSA process as a specific type of parametric pump. It follows intuitively that, as in an ordinary pump, the parametric pump will commence operation at steady-state if it is primed. In the casemore » of PSA, that amounts to purging the initial adsorber contents with the less strongly adsorbed component. Illustrations are provided of both single-bed and dual-bed processes. For a specific gas mixture and adsorbent, the effect of varying the ratio of the high and low pressures that occur in a cycle is examined. Results indicate that there is a significant advantage in priming the single-bed version because of the surge tank, which promotes backmixing. There is still an advantage in priming the dual-bed version, however, despite the absence of backmixing.« less