Fire Safety – Extinguisher Selector & Hydrant Flow

12Fire Extinguisher Selector

Select the fuel involved and the tool will recommend suitable extinguishing agents and warn against dangerous mismatches (e.g., water on a Class C electrical fire).

Fire class i

Setting

Test agent (optional — see warning)

Recommended agent

—

Pictogram cheat-sheet

A 🔥📦 Combustibles B ⛽ Liquids C ⚡ Electrical D ⚙ Metals K 🍳 Oils

13Muster Time Calculator

Approximates muster time for a single muster point: detection & reaction lag + walking time, with crowd-density slowdown. Compare against your facility's emergency-response plan target.

Facility area (m²)

Personnel on site

Average walking speed (m/s) i

Distance to muster point (m)

Detection & reaction lag (s)

Effective doorway / route width (m) i

Plan target (min)

Estimated muster time

— min

—

Walking time—

Flow-capacity time at pinch—

Detection lag—

vs. target—

—

23Hydrant Flow & Sprinkler Density

Two practical fire-water tools side-by-side. Hydrant flow: NFPA 291 pitot formula Q = 29.83·C·d²·√P (US gpm). Sprinkler: required pump flow from area-density (NFPA 13) — Q = density × area.

Hydrant flow test (NFPA 291)

Outlet diameter d (mm) 63 mm (2½″) outlet is the standard test for hydrants.

Pitot pressure P (kPa)

Coefficient of discharge C i

Flow result

— m³/h

Flow—

Status—

Sprinkler design (NFPA 13)

Hazard classification

Design area (m²)

Hose-stream allowance (L/min)

Sprinkler demand

— L/min sprinklers

Density—

Total demand (sprinkler + hose)—

Pump rating recommended—

For training purposes only. Always verify with NFPA 10 (extinguishers) and the site emergency-response plan / muster drill records.

Fire Safety Tools