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FIR-04 · Fire & life safety · review-required

Dry-pipe sprinkler system

Dry-pipe systems hold pressurized gas in piping until sprinkler operation releases the valve; they are not the same as preaction.

How it works

Use gas pressure to hold a dry-pipe valve closed until an operated sprinkler reduces pressure enough for water admission.

Where it fits

Reference comparison for environments where freezing or another approved condition drives dry piping.

Where it breaks

Dry pipe is selected merely to avoid water above IT equipment or is described as detection-controlled preaction.

Tradeoff register

  • Keeps water out of piping during normal state
  • Introduces valve and gas supervision
  • Water delivery sequence differs from wet pipe

Interactive teaching model

This card connects to the fire lab. Its output is a bounded calculation or an illustrative directional model, not measured site data or a commissioned design result.

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Source register

These sources support the teaching summary. Use current standards, site engineering and authority approval for real work.

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