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Fire Hydrant Systems
Fire Hydrant System Components and How They Work
From water tank to nozzle, understanding hydrant components helps building owners maintain them properly.
6 min read · 03 Nov 2026 · Tim Teknis Jaslindo
A fire hydrant system delivers pressurised water to firefighting points inside and around a building. Its components work as one system.
Main components
- Water source (reservoir/tank): a dedicated firefighting water reserve.
- Pump room: usually a jockey pump (maintains system pressure), an electric main pump, and often a diesel pump as backup during power loss.
- Pump control panel: starts pumps automatically on pressure drop.
- Piping and valves: carry water to every outlet.
- Hydrant boxes / hose reels: indoors, holding hose and nozzle.
- Hydrant pillars: in the yard, for larger hose lines.
- Siamese connection: inlet for fire brigade appliances to boost supply.
How it works, briefly
Opening a hydrant valve drops network pressure. The jockey pump tries to restore it; if the drop continues, the main pump starts automatically and supplies high-pressure water.
Why maintenance matters
A small leak, a seized valve or a panel left out of auto mode can make the system fail exactly when it is needed. Regular pump function tests and pipe network checks are essential.
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