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Premium member Presentation Transcript Pump types : Pump types Slide 2: 10 100 1000 10000 100000 10 1 10 100 100 1000 1000 1000 10000 10000 100000 10000 CAPACITY m3/hr PRESSURE lb/in2 APPROXIMATE UPPER LIMIT OF PRESSURE AND CAPACITY BY PUMP CLASS RECIPROCATING CENTRIFUGAL ROTARY PRESSURE bar CAPACITY US gal/min 1 10 1 Pumps applications : Pumps applications When to use Positive Displacement Pumps : When to use Positive Displacement Pumps Comparison Between Rotary and Centrifugal Pumps : Comparison Between Rotary and Centrifugal Pumps Centrifugal Pumps : Centrifugal Pumps Back pull out horizontal Pump Main features of the centrifugal pumps : Main features of the centrifugal pumps Simple in construction Compact and less weight of pump per unit quantity pumped Easy maintenance and smooth operation Continuous flow High speed of rotation can be achieved Single Stage Centrifugal pump : Single Stage Centrifugal pump Multistage Centrifugal pump : Multistage Centrifugal pump Reciprocating Pumps : Reciprocating Pumps Plunger pump Diaphragm Pump Features of the reciprocating pumps : Features of the reciprocating pumps Positive displacement of liquid High pulsation caused by sinusoidal motion of the piston High volumetric efficiency High starting torque External gear pump : External gear pump Rotary pumps Internal Gear pump : Internal Gear pump Screw pump : Screw pump Progressive Cavity pumps : Progressive Cavity pumps Other rotary pumps : Other rotary pumps Sliding vane pump Swinging vane pump Three lobe pump Main features of rotary pumps : Main features of rotary pumps Positive displacement Self priming Fairly constant discharge Less vibration Weight per unit flow is less compared to recip type Less no. of parts, making it less complicated CENTRIFUGAL PUMP COMPONENTS : CENTRIFUGAL PUMP COMPONENTS Casing types : Casing types Impeller types Performance curve of centrifugal pump : Performance curve of centrifugal pump Operating point Capacity BHP Efficiency BHP Efficiency Total Head Pump curve System curve Pumps maintenance : Pumps maintenance Breakdown or Run-to-Failure Maintenance Preventive or Time-Based Maintenance Predictive or Condition-Based Maintenance Pro-Active Maintenance Breakdown maintenance : Breakdown maintenance Basic philosophy• allow machinery to run to failure• repair or replace damaged equipment when obvious problems occur Advantages• works well if equipment shutdowns don’t affect production and if labor and material costs don’t matter Disadvantages• unplanned/”crisis management” maintenance activities• unexpected production interruptions• must have high parts inventory to react quickly• most inefficient maintenance operation Preventive Maintenance : Preventive Maintenance Basic philosophy• schedule maintenance activities at predetermined time intervals• repair or replace damaged equipment before obvious problems occur Advantages• works well for equipment that does not run continuously and personnel have enough knowledge, skill and time to perform the preventive maintenance work Disadvantages• scheduled maintenance may be done too early or too late• reduced production due to potentially unnecessary maintenance• possibility of diminished performance through incorrect repair methods Slide 24: Predictive maintenance Basic philosophy• schedule maintenance activities when mechanical or operational conditions warrant• repair or replace damaged equipment before obvious problems occur Advantages• works very well if personnel have enough knowledge, skill and time to perform the predictive maintenance work• repairs to equipment can be scheduled in an orderly fashion• allows some lead-time to purchase materials for the necessary repairs Disadvantages• improper condition assessment may actually increase maintenance work• requires procurement of equipment and training of in-house personnel Slide 25: Proactive maintenance Basic philosophy• utilizes predictive/preventive maintenance techniques with root cause failure analysis to detect and pinpoint the precise problems, combined with advanced installation and repair techniques, including potential equipment redesign or modification to avoid or eliminate problems from occurring Advantages• works extremely well if personnel have enough knowledge, skill and time to perform all of the required activities• repairs to equipment can be scheduled in an orderly fashion and improvements can be made to reduce or eliminate potential problems from occurring• allows some lead-time to purchase materials for the necessary repairs• substantially increases production capacity Disadvantages• requires extremely knowledgeable employees in preventive, predictive and prevention/ pro-active maintenance practices• requires procurement of equipment and training of in-house personnel or outsourcing this work to a knowledgeable contractor to perform duties Important terms in centrifugal pumps : Important terms in centrifugal pumps NPSH Cavitation Specific speed / Suction specific speed BEP Affinity laws Axial / Radial thrust API standards You do not have the permission to view this presentation. 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