Plans, Specifications, and Applicable Codes and Standards
Know which document governs
Installation is governed by NFPA 13 (sprinklers), NFPA 14 (standpipes), NFPA 20 (fire pumps), NFPA 24 (private mains), NFPA 25 (inspection, testing, and maintenance), and NFPA 72 (detection and alarm), plus the locally adopted building and fire codes. The AHJ has the final say. When the project specification is stricter than the code, follow the more restrictive requirement; when the specification conflicts with the code, ask before installing - never guess.
Working plans
Before installation, submit working plans drawn to scale showing supply data, occupancy classification, pipe sizes and routing, hanger and brace locations, head locations and spacing, hydraulic calculations, and the details of the water supply. Plans must be approved before work starts, and changes in the field require revised plans. A hydraulic design information sign and an owner's certificate of inspection and testing are part of the deliverable package.
What exam questions probe
- The difference between a code requirement, a specification, and a manufacturer's listing - the most restrictive governs.
- Who approves plans (the AHJ).
- Which document covers maintenance (NFPA 25), which covers installation (NFPA 13).
- Whether an as-built or record drawing is required at completion.
Worked example
A drawing shows 3 in. main where the calculation used 4 in. Pipe size is a design parameter, not a field convenience: installing 3 in. invalidates the calculation, so the field change must be routed back through plan review and approval before it is installed.