Lets do the Quick Caclulation
Inputs
Actul Flow in m3/hr ?
Design head MWC ?
Operating head MWC ?

Minimum Flow required for safer operating of the pump ?
How the by pass is maintained, using Orifice or control Valve ?
Let Boiler Steam flow rate is 31000 kg/hr

Flow
32.488 m3/hr X 1.05 (design factor) + Min. bypass flow via orifice = 40.87 m3/hr
Head
(Boiler pressure + pr. drop in system ) x 1.05 (design factor) = 207.38 MLC

SIZING PARAMETERS
Pr. Drop Flow Head Density
Flow Rate 31000 m3/hr MLC kg/m3
Working pr 18 1.75 40.87 207.38 955.317
Design Pr 20 1.75 40.87 228.38 995.331
Temp 105
Rated Flow 34
% Bypass 20

Select the pump for 40.87 m3/hr & 207MLC & 228MLC Condition

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