Category: Pumps

Pipe Vibrations

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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 total overall length from endpoint to endpoint including all elbows, bends, and straight pipe runs. …

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Pulsation Dampeners

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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 vibration with the use of pulsation dampeners. Dampeners are recommended for all major multipump installations, …

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Suction and Discharge Piping

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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 pump to feed the reciprocating pump. If the NPSH available is too low, valve breakage …

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Centrifugal Pump Installation Consideration

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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 like this one. The suction piping is sized for about 2-3 ft/sec and the discharge …

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Seals

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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 compressed for proper operation. Packing material may be made of flexible metallic strands with graphite …

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Bearings

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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 limited ability to handle thrust, high loads, or high speeds. Roller bearings transmit load from …

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Centrifugal Sump Pump

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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 water or hydrocarbons from shallow pits or compartments

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