HRSG Feed Water Pump

Yes.

yes you can how ever its advised to cross check and match pressure drop with gate valve and select and match with globe valve.

crm

Yes........if the valve is on the discharge side of the pump and you wish to regulate flow.......it is ideal...........if you do not wish to regulate flow, don't bother, you are better off leaving it as a gate valve (you achieve unrestricted flow).......if I remember correctly, the resistance created by a globe valve is equivalent to a length of 100' of straight pipe.

I am assuming that the valve is on the discharge side of the pump.

Just as a matter of interest, do not use a gate valve to regulate flow, they are designed to be isolating valves only.

I hope defintely you will have a standby pump for the Feed water application.If one pumptrips other has to start and makeup for the water. Hence normally we will not throttle the valve and keep full open.( full closed for isolation). hence operation point of view Globe valve is not recommended. If gate valve is not available, use Globe valve with tag ( KEEP FULL OPEN OR FULL CLOSE) for emergency.Hope the standby pump has AUTO START provision.

Take care of the physical dimensions & pressure drop values.

If physical dimensions are O.K, pressure drop will not be problem as design margin will be present (practical sense)