how pump selection are doing and by what specification need to see for industry uses?

Answer 1

You have to consider type of liquid to be handled,cost of liquid(mech.seal/gland type),corrosion factor so that MOC of wetted parts can be selected,head,capacity -so that power can be calculated,application-high/low flow-high head/low head,Available NPSH WITH RESPECT TO temperature.

FACTORS AFFECTING PUMP SELECTION:
Pump and system characteristic curves
Required flow and system head
Pumping duty point
Pump materials
NPSH.
CENTRIFUGAL PUMP APPLICATIONS To be kept in mind:
Pumping arrangements
Single pump operation
Pumps with continuously falling characteristic
curves
Pumps with rising and falling characteristic
curves
Identical pumps operating in parallel
Pumps of different size operating in parallel
Pumps operating in series.