AS 2118
Fire Sprinkler Block Plans
A fire sprinkler block plan is a schematic diagram that documents the layout of a building's automatic sprinkler system. It shows installation zones, zone valve positions, hazard classifications, sprinkler types and pipe routing — essential information for fire brigades, maintenance technicians and certifiers.
What is a sprinkler block plan?
A sprinkler block plan provides a simplified overview of an automatic fire sprinkler system. It identifies installation zones, valve locations, alarm valve sets, hazard classifications (OH, OHx, EH), sprinkler types deployed in each area, and the relationship between zones. It is not a design drawing — it is an operational reference document.
Why do you need one?
AS 2118 requires documentation of the sprinkler system that enables effective maintenance and emergency response. Fire brigades use the block plan to understand zone layout and locate isolating valves. Maintenance technicians use it during AS 1851 routine servicing. Certifiers and auditors reference it when assessing compliance.
What AS 2118 requires
The block plan should show: alarm valve set locations, zone valve positions, installation boundaries, hazard classification for each zone, sprinkler types (upright, pendent, sidewall, ESFR, etc.), pipe runs (schematic), floor level references, and any monitored connections.
Common problems we solve
Sprinkler systems are frequently modified without documentation being updated. Common defects include: hazard classifications that no longer reflect building use, plans showing removed or relocated valves, no documentation of system extensions, and buildings with no sprinkler block plan at all.
Frequently Asked Questions
What hazard classifications must be shown?
The block plan should identify the hazard classification for each zone — Ordinary Hazard (OH1, OH2, OH3), Extra Hazard (EH1, EH2), or special commodity-specific classifications per AS 2118.
Do you cover pre-action and deluge systems?
Yes. We document all sprinkler system types including wet pipe, dry pipe, pre-action and deluge installations.
What if our racking layout has changed?
Changes to racking height or storage configuration can change the required hazard classification and sprinkler design. We assess the current condition and update the block plan to reflect reality.
How is this different from the sprinkler design drawing?
A design drawing shows pipe sizes, head spacing calculations and hydraulic parameters for construction. A block plan is a simplified operational document showing system layout and zones for maintenance and emergency response.