Sunday, August 11, 2024

Head calculation

 Hss = Static suction head

Hst = Static Head

Hsl = Suction head losses

Hsm = Manometric suction head

Hsd = Static delivery Head

Hm = Manometric Head

Hdm = Manometric Delivery Head

Hdl = Delivery Head losses

V square/2g = Kinetic energy

Hf = Friction losses


Manometric Head, Hm = Manometric Delivery Head, Hdm - Manometric suction head, Hsm

Manometric suction head, Hsm = Manometric Delivery Head, Hdm - Manometric Head, Hm

Static Head, Hst = Static delivery Head, Hds - Static suction head,  Hss

Manometric Delivery Head, Hdm = Static delivery Head, Hds + Delivery Head losses, Hdl

Manometric suction head, Hsm = Static suction head, Hss - Suction head losses, Hsl - Vs square/2g

Manometric Head, Hm = Static Head, Hst + Suction head losses,, Hsl + Vs square/2g









Saturday, August 10, 2024

Comparison between Dynamic pump and Positive displacement pump

Comparison between Dynamic pump and Positive Displacement Pump :

Dynamic Pump

Positive Displacement Pump 

High flow rate pump

Low Flow rate pump

Low Pressure pump

High Pressure pump

Steady flow

 Pulsating flow

Relief valve not needed

Relief valve needed

Less noise

More noise

High speed

Low speed

High efficiency for low head

Low efficiency for low head

Mostly utilize for fluid transfer

Mostly utilize for fluid power

Course strainer(filter)

Fine Flow filter

Flow control valve used

Flow control valve cant be used

NRV needed at discharge and sometime at suction    

NRV needed at discharge side only

Uniform torque

Torque not uniform

Installation easy

Installation difficult 

Flowrate varies with change in pressure

Flowrate constant with change in pressure

Low initial cost

High initial cost

Low maintenance cost

High maintenance cost




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