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Misunderstood pump element serves to minimize mixing loss It is a common misconception in the U.S. pump industry that the function of the volute is that of a diffuser: to convert velocity into pressure. I have recently read and heard statements to this effect by centrifugal pump authorities. Igor Karassik [3] said that the “velocity is converted into pressure energy by means of a volute ...
The overhung or asymmetric style of volute is typical of designs used in the compressor industry. The chief advantage of this type of design is the ability to control the centroid of the cross-sectional area, thereby controlling the angular momentum of the volute. The other broad family of volute designs is the symmetrical style commonly used ...
The high-pressure water is released from the ends of the vanes to the pump’s volute. Traveling the path of the volute, the water is discharged at the flow and pressure as dictated by the impeller’s geometry.
If you haven’t already guessed, in my earlier example the pump cutwater is synonymous with the decision point to exit onto the off ramp. Are you getting off the interstate or are you staying on? How you approach the exit (the volute throat) affects both the traffic behind you and the entire local highway system, but how you, as the driver, approach the exit also depends on the highway design ...
Wear rings also play a significant part in another common form of wear that occurs in the volute casing side walls. One of a wear rings’ primary functions is to provide a restrictive annulus between different pressure regimes within a centrifugal pump. Because of this function, one side of the wear ring operates at higher pressure than the other.
The pump volute earns its name due to the spiral shape casing surrounding the impeller. The volute is the often forgotten, but nevertheless still critical, component in the pump. Not all volute designs are the same. The volute acts as a collection and pressure containment vessel for the liquid exiting the impeller.
Part 1 of this article appeared in the February 2022 issue of Pumps & Systems. Passing Vane Cavitation Phenomena This is a unique and specific type of cavitation caused by the impeller passing too close to the cutwater (s) on a volute-style pump, or in the case of a diffusor-style pump, the leading edge of the diffusor vanes. When the clearance between the impeller and the cutwater is too ...
The pump BEP is normally where these two “curves” intersect (in theory, these look more like straight lines than curves). Designing the impeller and casing to match each other will result in the most efficient and reliable pump. Of course, the volute inlet area has to be large enough to allow the flow required by the pump impeller. The important part is that the liquid velocity is evenly ...
Typically, grit flow rates fall into the 150 to 300 gallons per minute range resulting in a 3-inch or 4-inch pump selection. Recommended minimum volute thicknesses are 9/16 inch for 3-inch pumps and ¾ inch for 4-inch pumps. Wear plates/suction pieces for each respective design will be 1 inch or greater for 3-inch pumps and 1¼ inches for 4 ...
An effective pump troubleshooting tool will always begin with the question "When did this start?" Common conditions requiring pump troubleshooting expertise are cavitation, hydraulic imbalance, undersized shafts, and mechanical seal failure.