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Plant Engineering Calculator

Steam Drum Hold-Up Time Calculator — Usable Water Inventory & Ride-Through

Calculate usable drum water inventory and hold-up time from vessel geometry, usable level fraction, density and net drawdown rate.

Inputs

Results

Cylinder volume 10.60 m³
Usable water volume 2.12 m³
Usable inventory 1802 kg
Hold-up time 10.8 min

Formula

V=πD²L/4×usable fraction; t=ρV/net draw.

Worked example

A 1.5 m diameter, 6 m drum with 20% usable level band contains about 2.12 m³ usable volume before density correction.

Assumptions & limits

  • Simplified cylindrical inventory model; real drum internals reduce usable volume.
  • Do not use this screening result to override boiler protection or low-water trip requirements.

FAQs

What does this Steam Drum Hold-Up Time Calculator calculate?

Calculate usable drum water inventory and hold-up time from vessel geometry, usable level fraction, density and net drawdown rate.

Which inputs matter most?

Use measured operating data where possible and keep pressure, temperature, flow, efficiency and tariff inputs on the stated basis. Intermediate outputs make the calculation auditable.

Can I use this for final equipment selection?

Use it for engineering screening and scenario comparison. Confirm final selections against OEM curves, steam/property tables, applicable codes and project design conditions.

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Last updated: 2026-09-17