Quality Control
Sprinkler System Pressure Test
Perform a code-compliant hydrostatic test on the sprinkler system before concealment.
10 min Alex Kim Reviewed by Maria Delgado, Technical Reviewer, PE v1.0 · reviewed 2026-08-18
The Problem
Concealed leaks in sprinkler piping cause water damage and delay Certificate of Occupancy.
Root Causes
- Test held for insufficient time
- Missing witness from AHJ
- System not properly flushed of debris
Correct Procedure
- 1Flush the system to remove debris
- 2Isolate and hydrostatically test at 200 psi for 2 hours (per NFPA 13)
- 3Notify AHJ and general contractor to witness
- 4Log test result on the acceptance form
- 5Do not close ceilings until AHJ signs off
Discussion Questions
Use these to engage the crew and connect the lesson to today's site conditions.
- 1What pressure and duration does NFPA 13 require?
- 2Who signs the acceptance form?
Sources & Review
Author: Alex Kim (20+ yrs) · Reviewed by Maria Delgado, Technical Reviewer, PE.
Published 2024-05-14 · Last technical review 2026-08-18 · Version 1.0 · Languages: EN
AI at QST only summarizes expert-approved content and never invents safety requirements.
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