Centrifugal Pumps

Internal recirculation in centrifugal pumps - A pump operating at lower capacity than design limits can suffer from recirculation which occurs internally in the pumps. When the capacity of a pump is reduced by throttling (or as a result of an increase in system head), a secondary flow called recirculation begins. All impellers have a critical capacity at which recirculation occurs.
Cavitation in centrifugal pumps-

Foundation and Base Plates for pumps - Proper foundation reduces vibration levels, which in turn leads to increase in Mean Time Between Failures (MTBF), extends lifetime of mechanical seals and bearings and reduces total life cycle cost. Pumps have to be properly secured to their base plates, which in turn have to be well-bonded to the underlying foundation. Nowadays, this bonding is usually achieved with the use of epoxy grout.
Mechanical Seals for Pumps: common types - Mechanical seals are devices which keep or seal the pumped fluid in the pump casing, thus avoiding leakages and costly loss of pumped product. Different types of pump mechanical seals are discussed in this article with brief description of how the pump mechanical seals work.
Different types of pumps mechanical seal piping plans are detailed in API 682 or ISO 21049 standards.Mechanical seals for pumps: types of piping plans for single seals-  Most common types of pump seal piping plans for single seals.Mechanical seals for pumps: types of piping plans for double seals - Most common types of pump seal piping plans for double seals.
Operation and Maintenance of centrifugal pumps -
Typical pump start-up procedures
Pump Priming, How to prime pumps and self priming pumps
Pump cavitation, causes and effects and how to prevent cavitation

Self Priming pump
Piping in pump suction - use of eccentric reducers depending on straight length of pump suction piping -Eccentric reducers are typically installed at the centrifugal process pump suction nozzles in order to facilitate proper transition from the the larger diameter suction piping and to avoid accumulation of vapors near the pump suction nozzle.
Theory and Equations for centrifugal pump systems-

Typical centrifugal pump datasheet - When issuing a Request for Quotation (RFQ) for centrifugal pumps, it is strongly advisable that a detailed pump datasheet is included. A datasheet including as much information as possible will save the pump manufacturer-supplier considerable time from having to browse through tens or even hundreds of pages of specifications in order to find the necessary information in order to provide the best quotation in a timely manner.
Miscellaneous design tips -


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