Diligent 🎓🦺 inspection Evaluators and Rotary Connect🪝 "For Lead Mechanical Engineers"
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Diligent 🎓🦺 inspection Evaluators and Rotary Connect🪝 "For Lead Mechanical Engineers"
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Diligent 🎓🦺 inspection Evaluators and Rotary Connect🪝 "For Lead Mechanical Engineers"
16 July 2023 21:46
Q. When we need pump in parallel and pump in series?
Pumps !!
A. If we need a higher discharge flow(Q) we have to go
pump in parallel.
If we need a higher head (H) we need to go for pump in series. Q. What factors are considered when designing a pump?
A.Flow rate, pressure, temperature, viscosity, and the characteristics of the fluid being pumped.
Q. What is the purpose of a volute in a centrifugal pump?
A. To convert the kinetic energy of the fluid into pressure.
Q. What is the purpose of a diffuser in a centrifugal pump? A. To convert the high velocity, low pressure fluid leaving the impeller into high pressure, low velocity fluid.
Q. What is the purpose of pump curves? A. To provide information on a pump's performance, including flow rate, head, and power consumption.
Q. What is pump priming? A. The process of removing air or gas from the pump and
suction piping prior to startup.
Q. What are the different methods of pump priming? A.Manual priming, automatic priming, and self-priming.
Q. What is the difference between a pump curve and a system curve ?
A.A pump curve shows the pump's performance
characteristics, while a system curve shows the relationship
between flow rate and head for the entire piping system. Q. What is the purpose of pump impeller trimming? A. To adjust the pump's flow rate and head by trimming the
impeller diameter bu using affinity laws equations.
Q. What is pump shut-off head? A. The maximum head that a pump can produce when
flow rate is zero.
Q. What is the purpose of a pump seal flush?
A. To cool and lubricate the pump seal, and to prevent the
buildup of solids or gases that can damage the seal.
Q. What is the purpose of pump selection criteria? A. To ensure that the selected pump is appropriate for the application, including flow rate, pressure, temperature, and the characteristics of the fluid being pumped.
Q. What is the difference between a constant speed pump
and a variable speed pump?
A.A constant speed pump operates at a fixed speed, while a variable speed pump can adjust its speed to maintain a constant flow rate or pressure.
Q. What is pump suction lift?
A. The vertical distance between the pump centerline and the liquid surface in the suction vessel.
Q. What factors affect pump suction lift? A.Atmospheric pressure, fluid density, and friction losses in the suction piping.
Q. What is the difference between total head and dynamic head? A.Total head is the sum of static head and dynamic head,
while dynamic head is the head required to friction in the piping system. overcome
Q.How is pump efficiency calculated?
A.Pump efficiency =(output power / input power) x 100%
Q. When do you use a gear pump?
A.Is commonly used for handling higher viscosity liquid.
Q. Why balanced opposed rotor arrangement perfered ? A. To reduce the residual unbalanced thrust.
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