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Plant Engineering Calculator

Boiler Blowdown TDS Calculator — Cycles, Blowdown Fraction & Rate

Estimate boiler-water concentration ratio and continuous blowdown requirement from feedwater TDS, target boiler TDS and steam production.

Inputs

Results

Cycles of concentration 10.00
Blowdown rate 1111 kg/h
Blowdown / steam 11.11 %
Feedwater required 11111 kg/h

Formula

cycles=TDSboiler/TDSfeed; B=S/(cycles−1).

Worked example

Feedwater at 200 mg/L and a 2,000 mg/L boiler limit gives 10 cycles and blowdown near 11.1% of steam flow in the ideal balance.

Assumptions & limits

  • Assumes dissolved solids leave mainly with blowdown and steam carryover is negligible.
  • Use site chemistry limits and boiler-water treatment guidance for actual setpoints.

FAQs

What does this Boiler Blowdown TDS Calculator calculate?

Estimate boiler-water concentration ratio and continuous blowdown requirement from feedwater TDS, target boiler TDS and steam production.

Is this suitable for final design?

Use it for transparent engineering screening and diagnostics. Verify final design or operating changes against measured site data, OEM curves and applicable standards.

Why are assumptions shown?

Plant calculations depend on operating boundaries. Explicit assumptions make scenarios auditable and prevent false precision.

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Last updated: 17 September 2026