Basic Boiler Calculations | Feed water Flow | Blow Down | Make Up | Condensate

Basic Boiler Calculations

Feedwater = Make up + Condensate Return

Feedwater Flow (FWF) = Steam Make + Blowdown(BD)

Feedwater Flow (FWF) = Steam Make + Steam Make Cycles -1

Blowdown = Steam make Cycle-1  or = FWF Cycles 

% Blowdown = as a % of FWF Cycles

Condensate Return is also expressed as % of FWF

If Condensate Return = 60% Make up = 40%

% Condensate + % Make up = 100% = FWF

As the boiler water cycles of concentration increase then the feedwater flow and the steam make approach the same number

Calculate the feedwater composition (impurities) from make up and condensate analysis below