The following data will be required for sizing and selecting a right pump
S > Size of pump , liters per minute or cubic meter hour(m3/hr )
T >Total Head in the system , including NPSH available
A > Application
* feed water, dosing ,transfer, mixing etc
M > Media ~name of fluid or media to be pumped
Viscosity ,SG , Temperature ,solid content ,PH etc
* these will more or less ,help us determine the type of pump to offer
* and also the material of pump construction
P > Power . the driver of pump
* electric motor .air driven or engine driven , maybe steam driven
S > Shaft sealing . mechanical seal or gland packing
* type and material of mechanical seal/packing
* require seal flush or quenching ?
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