Controls 4 Steam UK Limited


Steam Boiler Calculator

Total Dissolved Solids (TDS) and Oxygen Contents Calculator  

You can also fill the online forms here:

Compare Actual with Ideal

  1. Input Boiler details
  2. Adjust Load % to suit operating conditions
  3. Input actual hourly feedwater temperature
  4. Input pump settings for the oxygen scavenger
  5. Click on the Recalculate bar

Compare the results:

  • If you are under dosing oxygen treatment your boiler is at risk.
  • Overdosing increases TDS blowdown wasting fuel and money.

Boiler Pressure Bar (G) :
Boiler Max Evaporation Rate :
Feed TDS (mg/l) :
Boiler Target TDS (see BS2486) (mg/l) :
Historical TDS(from records) (mg/l) :
Boiler Capacity (Litres) :
Cost of Fuel per Unit :
Calorific Value of Fuel (MJ/Unit) :
Operational Days per year :
Boiler Efficiency :

(Calorific Value is per unit eg. Gas = 39MJ/M3, HFO = 43MJ/Kg)


Boiler Load vs Time
 Load, % 
 01 
 01 
 01 
 01 
 01 
 01 
 20 
 50 
 70 
 80 
 80 
 80 
 80 
 80 
 80 
 80 
 70 
 30 
 20 
 01 
 01 
 01 
 01 
 01 
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23


Time, Hr


Load, %


Feed Temperature, °C



Feedwater Temperature vs Time
 Feedwater Temperature, % 
 95 
 95 
 95 
 95 
 95 
 95 
 90 
 90 
 85 
 85 
 80 
 80 
 80 
 80 
 80 
 80 
 85 
 85 
 85 
 90 
 95 
 95 
 95 
 95 
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23





Oxygen Control Pump Data

Oxygen Scav pump stroke rate :
Oxygen Scav pump stroke length :
Oxygen Scav pump max discharge l/hr :
Oxygen Scav max. pump rate :
Oxygen Scav concentration


Ideal Blowdown 6.1%Ideal B/down/day 5361.3 Kg
Historic Blowdown 8.7%Historic B/down/day 7914.3 KgExcess B/down 2189.7 Kg
  Fuel loss/DAY in excess B/Down = 43.9 Units
  Fuel loss/YEAR in excess B/Down = 8776.3 Units
  Fuel COST/YEAR in excess B/Down = £2632.9
O2 dissolved in feed water 221.8 gms/dayOx Scav required = 17741.6 gms
  Excess Oxygen Scavenger dosed/Year = -2908.3 L
  UNDER DOSING OXYGEN SCAVENGER
 Actual Dosed = 3200.0 gms/dayPotential Metal loss/DAY = 424.1 gms
  Potential Metal loss/YEAR = 84.8 Kg


Hourly Oxygen Scavenger Analysis – Blue (Left) Dosed (Pump settings), Red (Right) calculated requirement from Feed & Boiler Conditions
 Quantity 
0.13 0.01
0.13 0.01
0.13 0.01
0.13 0.01
0.13 0.01
0.13 0.01
0.13 0.27
0.13 0.68
0.13 1.34
0.13 1.54
0.13 1.92
0.13 1.92
0.13 1.92
0.13 1.92
0.13 1.92
0.13 1.92
0.13 1.34
0.13 0.58
0.13 0.38
0.13 0.01
0.13 0.01
0.13 0.01
0.13 0.01
0.13 0.01
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

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Page updated 30th Jun 2014, 08:50

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