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Plant Engineering Calculator

Updated Sep 18, 2026

Steam Separator Sizing Calculator — Velocity, Area & Diameter

Screen a steam separator or line bore from steam mass flow, specific volume and target velocity. Returns volumetric flow, required free area and equivalent diameter.

Live calculationWorking shownPrivate in browser

Inputs

Results

Steam volume flow 0.41666667 m³/s
Required free area 0.020833333 m²
Equivalent diameter 162.8675 mm
More actions

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Formula

A=(m×v)/(3600×V); D=sqrt(4A/π).

Your calculation, step by step

These steps use the values currently entered above so the result can be checked independently.

  1. 1.Volumetric steam flow = 5000 × 0.3 ÷ 3600 = 0.41666667 m³/s.
  2. 2.Required free area = 0.41666667 ÷ 20 = 0.020833333 m².
  3. 3.Equivalent circular diameter = √(4 × 0.020833333 ÷ π) = 162.8675 mm.

How to use this calculator

  1. Enter measured or design values using the units shown beside each field.
  2. Review the live results and the substituted calculation steps before using the estimate.
  3. Check the assumptions below, then continue to a related calculator when the next engineering decision needs another model.

Worked example

At 5,000 kg/h, 0.3 m³/kg and 20 m/s, required free area is about 0.0208 m².

Assumptions and limits

  • Specific volume must match actual steam pressure/quality.
  • Vendor pressure-drop and separation-efficiency curves remain mandatory.

How to interpret the result

Treat the primary result as an engineering screening value, then use the secondary outputs to understand scale, energy or operating impact. Confirm site measurements, equipment limits and applicable standards before making a design or control change.

Questions engineers ask

Which steam specific volume should I enter?

Use specific volume at the actual separator inlet pressure and steam condition. Wetness, superheat or a pressure different from the design basis changes volumetric flow and therefore the required free area.

Does calculated diameter select the separator?

No. The diameter is a velocity/free-area screen. Confirm the manufacturer’s separation-efficiency, pressure-drop, turndown, drain and carryover limits before selection.

Why does lower target velocity increase separator size?

At fixed mass flow and specific volume, volumetric flow is fixed. Required area equals volumetric flow divided by target velocity, so lowering velocity requires more free area.

Continue the calculation

Use the next calculator in the same engineering workflow instead of restarting from search.

steam velocitysteam pipe sizingsteam trap sizing
Methodology. MAXScanner shows the governing formula, entered values and calculation outputs so the estimate is auditable. The calculator is a screening aid; assumptions and equipment-specific limits remain part of the engineering review.