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Steam Trap Sizing and Steam Loss — online

How big a trap does this drip leg need, and what does one that fails open cost you every year?

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Sheet

Yellow cells are inputs; orange cells are choices; blue cells choose the unit. Select or hover over an input to see its help in the box below the toolbar. The sheet is the same as the Excel tool (USD 39) — the Guide, method and references are in the Excel file.

Input help: select an input to see what it means and which units it takes.

What this steam trap sizing and steam loss calculator does

Size a steam trap for a drip leg, process heater or known load, estimate the steam, fuel and cost lost by a trap that fails open, and see the payback of repairing the traps in your survey.

  • Condensate load three ways. A steam line drip leg, a process heater or exchanger from its duty, or a load you already know.
  • Required trap capacity. With a safety factor by trap type or your own, plus capacity and pressure classes as screening aids.
  • Back pressure and flash. Differential pressure, back-pressure ratio and flash steam fraction at the trap discharge, with a warning when back pressure is high.
  • Cost of a trap failed open. Steam loss from the seat orifice by the isentropic or Napier method, cross-checked, with the annual steam, fuel and cost.
  • Survey table for 20 traps. Failure rate, total loss, cost of the repair programme, annual saving and payback.
  • What-if tables. Repair the worst traps first, and a worn seat orifice at larger sizes, with ranked findings and three charts.

How it was checked

149 cases against an independent IAPWS-IF97 Python model: every combination of trap type, load basis, loss method and cost basis, random inputs, US and British units and 54 edge cases; more than 6,900 values agree to better than 1E-9.

Related

Questions

Is the steam trap sizing and steam loss calculator free?

You can enter and check all your data free. The full results, findings and printable sheet are unlocked with a 3-run pack (USD 9), a monthly subscription to all online tools (USD 15) or a yearly one (USD 99).

Are the results the same as the Excel tool?

Yes. The online tool runs the formulas of the Steam Trap Sizing and Steam Loss Excel workbook and was checked cell by cell against the Excel file.