Category Archives for Pumps

Pipe Vibrations

To minimize pipe vibrations it is necessary to design pipe runs so that the “acoustic length” of the pipe run does not create a standing wave that adds to the pressure pulsations in the system. The acoustic length is the … Continue reading

12. September 2009 by Jack
Categories: Controlling Pulsating Flow | Tags: | Leave a comment

Pulsation Dampeners

In many instances where the sizing recommendations previously discussed are used, there is not need to install dampeners to reduce liquidpulsations. However, in most instances, it is possible to further reduce pulsations and thus reduce pump maintenance costs and piping … Continue reading

12. September 2009 by Jack
Categories: Controlling Pulsating Flow | Tags: , | Leave a comment

Suction and Discharge Piping

It is absolutely imperative that the suction piping be sized to assure that the NPSH available exceeds the NPSH required by the pump. Often, this can be arranged by elevating the suction tank or by providing a lowhead centrifugal charge … Continue reading

12. September 2009 by Jack
Categories: Controlling Pulsating Flow | Tags: | Leave a comment

Centrifugal Pump Installation Consideration

Figure 11-14 shows a typical mechanical flowsheet for two centrifugal pumps installed in parallel. It is presented to illustrate some of the considerations necessary for a good pump installation. Every installation has different objectives and very few will be exactly … Continue reading

12. September 2009 by Jack
Categories: Centrifugal Pumps | Tags: | Leave a comment

Wear Rings

These are easily renewable leakage seals between the impeller or shaft and casing designed to prevent leakage from high pressure to low pressure areas. They require a difference in hardness to avoid galling, and in sandy service a flushing fluid … Continue reading

12. September 2009 by Jack
Categories: Centrifugal Pumps Bearings-Seals-Wear-Rings | Tags: | Leave a comment

Seals

Seals are necessary to prevent leakage at the point where the shaft enters the pump case. The most inexpensive seal is made of packing material that acts as a pressure breakdown device. Packing must be flexible and capable of being … Continue reading

11. September 2009 by Jack
Categories: Centrifugal Pumps Bearings-Seals-Wear-Rings | Tags: | 1 comment

Bearings

Ball bearings transmit a load from a rotating surface to a fixed surface via a series of rotating balls. They are generally inexpensive, do not require any separate lubrication system, and can be designed to be selfaligning. However, they have … Continue reading

11. September 2009 by Jack
Categories: Centrifugal Pumps Bearings-Seals-Wear-Rings | Tags: | Leave a comment

Centrifugal Submersible Pump

Description Mounting = Vertical Casing split = Radial Impeller type = Radial Mounting feet = Mounting plate No. of stages = Multiple Applications Flow conditions: High head and moderate flow rate, low NPSH available Service rating: Critical Typical uses: 1. … Continue reading

10. September 2009 by Jack
Categories: Generic Types of Centrifugal Pumps | Tags: | Leave a comment

Centrifugal API Vertical Turbine or Can Pump

Description Mounting = Vertical Casing split = Radial Impeller type = Mixed or radial Mounting feet = Mounting plate No. of stages = Multiple Applications Flow conditions: High head and high flow rate, low NPSH available Service rating: Critical Typical … Continue reading

10. September 2009 by Jack
Categories: Generic Types of Centrifugal Pumps | Tags: , | Leave a comment

Centrifugal Sump Pump

Description Mounting = Vertical Casing split = Radial Impeller type = Radial Mounting feet = Mounting plate No. of stages = Single Applications Flow conditions: Low head and moderate flow rate Service rating: Non-critical Typical uses: Primarily used to pump … Continue reading

10. September 2009 by Jack
Categories: Generic Types of Centrifugal Pumps | Tags: | Leave a comment

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