Vertical turbine pumps

American Waterworks Association (AWWA) EIOI, Deep Well Vertical Turbine Pumps... 

Change process to adjust specific gravity to design value, or throttle pump to reduce horsepower requirements. This will not correct problem with some vertical turbine pumps that have a flat horsepower-required curve. 

These motors have a lower efficiency as a result of running in liquid, causing more liquid drag and also axial thrust bearing loss, which is also a part of the motor. However, this lower efficiency of the motor is compensated by fewer mechanical and hydraulic losses in a submersible motor-pump installation, compared to a vertical turbine pump installation. 

You can only raise a column of cold water in a pipe a maximum of. S.S.9 ft with a pump in suction lift. Beyond 34 ft, the water will boil or vaporize. This is the reason why submersible pumps and vertical turbine pumps exist. I here is no limit to the distanee you can push a liquid from below, but you can only a.spirate a liquid a maximum of 34 ft from below the pump. 

Barrel or canned vertical turbine pumps can be used in-line (Piping, auxiliary booster, and low NPSH applications). 

Centrifugal pumps with diffusion vanes are called diffusion pumps or, more recently, vertical turbine pumps. Those pumps with volute casings are called volute pumps. 

The most familiar examples of one-way clutches are the bicycle freewheel, which enables the cyclist to stop pedaling without stopping the bicycle, and the non-reversing ratchet used on vertical turbine pumps. 

Where a significant lift is required such as offshore, several options are available such as a shaft driven, hydraulic drive or electrical submersible pump. Shaft driven vertical turbine pumps historically have been used extensively offshore, but recent reliability improvement with electrical submersible pumps and hydraulic drive units have been eagerly accepted as they eliminate alignment problems, topsides weight and in some instances are less complex than the right angle engine driven vertical turbine units. Hydraulic calculations for offshore pump installations must remember to account for tide and wave fluctuations. 

Submersible turbine pumps are a variety of vertical turbine pumps with the motor attached below the pumping unit. Water passes in through an intake port located between the motor and bowl assembly, then upward through the bowl stages to the surface through the pump pipe. Electric power is supplied to the motor by specially insulated wires. Submersible turbine pumps are manufactured for water supply and oil well usage by a wide variety of manufactures in sizes ranging from /3 to several hundred horsepower, and are constructed of materials suited for many chemicals. 

The three drivers recognized by the NFPA code on fire pumps are diesel, electric and steam. The diesel fire pump is the preference of most insurance companies. They have a long history of satisfactory service. These units tend to be more expensive especially when they are used with vertical turbine pumps. With vertical turbine pumps, they require a right-angled drive which significantly increases the cost. They are self-contained and do not depend on outside utilities. 

The vertical turbine pumps appear to be used for suction under lift. In reality, they are also under head because the impeller is below the water level. This can be used for suction from wells and below grade reservoirs, and are sometimes configured into can pumps. These pumps will chum at 140% of rated pressure. They can also provide 150% of volume at 65% of rated pressure. 

Vertical intake wells eonsist of a nonmetaUic casting [typically, fiberglass-reinforced pipe (FRP) or polyvinyl chloride (PVC)], proper-grade stainless steel well screen (if needed), and a stainless steel submersible or vertical turbine pump (see Fig. 3.2). These wells are usually less costly than the horizontal wells, but their yield is relatively small (typieaUy 400-4000 m /day). 

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