The Experts below are selected from a list of 12 Experts worldwide ranked by ideXlab platform
Stan Shiels - One of the best experts on this subject based on the ideXlab platform.
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Chapter 23 – Overlooked key areas of centrifugal pump maintenance
Stan Shiels on Centrifugal Pumps, 2020Co-Authors: Stan ShielsAbstract:Publisher Summary This chapter addresses four principle areas of centrifugal pump maintenance—replacement of mechanical seals and maintenance of seal peripherals, replacement of rolling element bearings, impeller clearance adjustments and impeller replacement, and pump-driver alignment and coupling care. Many of today's centrifugal pump mechanical seals are supplied in cartridge form. The areas of prime importance when a seal repair or replacement is performed, if a satisfactory length of service is to be realized are—seal cavity checks for perpendicularity, concentricity, shaft run-out and Throat Bushing clearance; and cleanliness of seal flush piping and seal peripherals. Further, impeller clearances are essentially the clearances that exist between the impeller rotating surfaces and the parts of the pump casing in close proximity to these surfaces. In addition, the two areas of pump maintenance that are often overlooked during pump overhaul, or during cleaning of a suction strainer that requires removal of a spool piece—adjustment for pump growth due to temperature in hot service and the need to re-align after a piping disturbance. Many large companies have developed maintenance standards for repair of equipment, including pumps.
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The importance of running clearances in centrifugal pumps
World Pumps, 1997Co-Authors: Stan ShielsAbstract:Abstract All centrifugal pumps must have clearance between the stationary pump casing and the rotating element. In single stage pumps this clearance is limited to the clearance between the impeller surfaces and the casing, and the clearance between the seal cavity (or stuffing-box) Throat Bushing and the shaft. There are a number of close tolerance clearances which, if altered, will change one or more of a pump's characteristics.
L.c. Chang - One of the best experts on this subject based on the ideXlab platform.
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Can pump maintenance problems be solved by engineered modifications
Oil & Gas Journal, 1991Co-Authors: R.e. Allen, L.c. ChangAbstract:Engineered solutions for vertical can-pump maintenance problems reduced maintenance costs and high production losses, and eliminated replacement costs. The vertical can pumps shown were installed in a major waterflood operation in California. Ten vertical pumping systems were installed at three locations in the field. Each system included a booster pump and an injection pump connected in series and mounted on a common concrete support base. Source- well water pressure was increased from less than 100 psig to 3,000 psig by the two-pump system. During the first 4 1/2 years of operating the pumping systems, excessive failures were experienced. Motor bearing failures, seal failures, Throat-Bushing failures, and deep erosion of the pump shaft in the Throat Bushing area were presenting a nightmare maintenance program. Average motor thrust bearing life was only 2-4 weeks. Seals and Throat Bushings were failing every 4 weeks. This paper illustrates a typical Throat-Bushing failure. These failures led to replacement of the pump shafts as well as the Bushings due to severe scoring of the shafts.
R.e. Allen - One of the best experts on this subject based on the ideXlab platform.
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Can pump maintenance problems be solved by engineered modifications
Oil & Gas Journal, 1991Co-Authors: R.e. Allen, L.c. ChangAbstract:Engineered solutions for vertical can-pump maintenance problems reduced maintenance costs and high production losses, and eliminated replacement costs. The vertical can pumps shown were installed in a major waterflood operation in California. Ten vertical pumping systems were installed at three locations in the field. Each system included a booster pump and an injection pump connected in series and mounted on a common concrete support base. Source- well water pressure was increased from less than 100 psig to 3,000 psig by the two-pump system. During the first 4 1/2 years of operating the pumping systems, excessive failures were experienced. Motor bearing failures, seal failures, Throat-Bushing failures, and deep erosion of the pump shaft in the Throat Bushing area were presenting a nightmare maintenance program. Average motor thrust bearing life was only 2-4 weeks. Seals and Throat Bushings were failing every 4 weeks. This paper illustrates a typical Throat-Bushing failure. These failures led to replacement of the pump shafts as well as the Bushings due to severe scoring of the shafts.
W.e. Bill Forsthoffer - One of the best experts on this subject based on the ideXlab platform.
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Pump flush system overview
Forsthoffer's Rotating Equipment Handbooks, 2020Co-Authors: W.e. Bill ForsthofferAbstract:This chapter presents an overview of pump flush system. Pump flush systems use the same fluid phase as the process to meet their objectives. They utilize a liquid, as in the case of gas seal systems which utilize the compressor process gas or external source of gas. As pump flush systems utilize a liquid, they tend to be simpler than liquid seal systems in compressor applications. The function of a pump flush system is to continuously provide cool clean flush fluid to the specified points at the correct pressure, temperature, and flow rate. The inner seal chamber consisting of the single mechanical seal and the Throat Bushing, actually comprise a double seal with respect to the flush liquid. This is because the flush liquid has two paths that are through the seal and through the Throat Bushing. Conceptually, this seal configuration is exactly the same as that of a mechanical contact seal in a compressor application. The mechanical contact seal represents the inboard seal, and the Throat Bushing represents the outboard seal. The internal components of the flush system depend on the particular seal configuration.