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The Engineering Toolbar
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From Cole-Parmer
Pumping viscous liquids can present some difficult problems. When selecting a pump, fluid viscosity must always be considered. The effects of viscosity can be better understood by looking at the behavior of viscous liquids when subjected to force. Newtonian LiquidsViscosity remains constant regardless of changes in shear rate or agitation. As pump speed increases, flow increases proportionately. Liquids displaying Newtonian behavior include water, mineral oils, syrup, hydrocarbons, and resins. Products & Services
Impellers are rotating devices that force liquids, gases and vapors in a desired direction. They are widely used in pumping, blowing, and mixing applications.
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Hand pumps and foot pumps are manually operated pumps that can driven by hand or foot via a handle or lever.
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Learn more about Hand Pumps and Foot Pumps
Sump pumps are used in applications where excess water must be pumped away from a particular area. Sump pumps generally sit in a basin or sump that collects this excess water.
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Self-priming pumps create and maintain a sufficient vacuum level to draw fluid with no external assistance
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Learn more about Self Priming Pumps
Wastewater pumps are used in the collection of sewage, effluent, drainage and seepage water.
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Topics of Interest
Viscosity is the internal resistance of a fluid to flow. Water has low viscosity,
while syrup has high viscosity. When syrup is cold it is very much more viscous
than when it is hot. Viscosity is...
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When to use a centrifugal or a Positive Displacement pump ("PD Pump") is not always a clear choice. To make a good choice between these pump types it is important to understand that these two types of...
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24.1 Introduction
Lubricants minimise friction and wear in rubbing contacts by reducing metal-metal contact, removing wear debris, and carrying away frictional heat. They may also prevent rusting...
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Some fluids exhibit different apparent viscosities under different conditions.
Actually, the definition of viscosity implies that there is a fixed ratio between
shear stress and shear rate in the...
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It is very easy to forget that plastic melts are not thermally stable over long periods at, or above, melt temperature. Equally, it is as easy to forget that the molten mass is not impervious to the...
(Read More)
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