Upgrading Pump Capacity

The things you mention will all be in the picture. A critical item not yet mentioned is the NPSH_a of the system vs NPSH_r of the new pump at the the new flow rate.

What type, flow, hp or kw, and connection sizes are both pumps?

appreciate your comments

both pumps will be same type which is vertical multi stage centrifugal pump. The new proposed pump will be rated at higher flow/head (17 m3/h, 152 m).

with respect to NPSHr the charactistic curve of the pump is not having this curve. i am ignooring this because the pump will be running under positive suction head. hope my assumption is correct.

Any feed back from you regarding calculation of NPSHa and NPSHr will be appreciated.

• A primary parameter is the ability of the piping to withstand the higher discharge pressure without rupture.
• What about relief valve sizing for the higher flow?
• Any bursting discs downstream?
• Higher flow and pressure requires higher power, which is the product of the two:
• Is the electrical supply sufficient?
• Is the motor cable correctly sized?
• What about motor overload protection and circuit protection co-ordination for both this and other circuits conencted to the distribution point?