Sprinkler System
A sprinkler system is automatic fire suppression: water-charged piping with heat-activated heads that open individually directly over a fire, controlling it within minutes without any human action, designed to IS 15105 under NBC 2016 Part 4.
Why it matters on an MEPF project
Sprinklers are the difference between a machine fire and a building fire, and the code knows it: NBC 2016 Part 4 mandates them by occupancy, height and area — high-rises, most large commercial buildings, and storage/industrial occupancies beyond thresholds. Contrary to cinema, heads open one at a time where heat reaches them; the "all heads at once" deluge is a different, special-hazard system.
Design to IS 15105 is hazard-based: light, ordinary and high-hazard classifications set design density, coverage per head and water demand. Storage occupancies are the trap — racking height and commodity class can push a "simple warehouse" into demanding design territory, which is exactly where under-designed systems get exposed.
How it's specified in practice
| Parameter | Typical / working position | Governing reference |
|---|---|---|
| Hazard classification | Light / ordinary / high hazard — sets density and demand | IS 15105 |
| Head activation | Individual heads open at rated temperature (commonly 68 °C class for ordinary occupancies) | IS 15105 |
| Coverage per head | Per hazard class and head type | IS 15105 |
| Water supply | Dedicated pumps + tank share sized for sprinkler demand duration | IS 15105 / NBC 2016 Part 4 |
Common mistakes
- Classifying a racked warehouse as ordinary hazard because it "is just storage".
- Heads obstructed by later ducting, lighting or racking — coverage exists on the drawing only.
- No flow-switch zoning, so the alarm panel cannot say which area is discharging.
- Painting heads during fit-outs — a painted head is a dead head.
Related on this site
Frequently asked
Do sprinklers cause massive water damage when one machine catches fire?
Only the heads over the fire open — typically one to a handful — discharging far less water than the fire brigade would need if the fire grew. The water-damage myth comes from films, not from IS 15105 systems.
Which buildings must have sprinklers in India?
NBC 2016 Part 4 mandates them by occupancy, height and area — high-rise buildings and large/higher-hazard occupancies broadly. Your exact obligation comes from the occupancy tables; our Fire NOC checker gives a first answer in a minute.
Standards referenced: IS 15105 · NBC 2016 Part 4