Fire FightingMethod Statement (MOS) Hold & Witness Included PDF / Word / Excel
Fire Fighting Sprinkler Installation Method Statement Template
A Fire Fighting Method Statement (MOS) details the end-to-end procedural execution, safety hazard identification (JHA), and quality verification protocols for installing wet pipe automatic sprinkler systems, fire main risers, and zone control assemblies. Governed by NFPA 13, NFPA 14, and local civil defense regulations, this method statement covers carbon steel grooved piping fabrication, threaded pendant/upright sprinkler head installation, pipe hanger placement, and 200 psi hydrostatic acceptance testing.
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Red primer painted seamless pipes; glass bulb sprinklers undamaged and stored in original protective boxes
Mechanical QC Inspector
3.0
Fabrication
Roll Grooving of Pipe Ends & Dimensional Groove Inspection
WWS
Victaulic / Groove Spec
Groove depth and diameter verified using manufacturer groove go/no-go caliper gauge; no burrs or cracks
Pipe Fabrication Foreman & QC
4.0
Erection
Main Fire Riser & Cross Main Pipe Erection with Swivel Hangers
WWS
NFPA 13 Chapter 9
Hanger rod sizing compliant with pipe diameter; seismic sway braces installed on all mains >= 2.5 inches
Site Supervisor & QC
5.0
Valves
Zone Control Valve Assembly (OS&Y, Flow Switch & Pressure Relief)
HWW
NFPA 13 Section 8.16
Supervised butterfly or OS&Y gate valve equipped with tamper switch; water flow switch wired and tested
Fire Protection QC & Electrical QC
6.0
Sprinklers
Sprinkler Head Positioning, Spacing & Deflector Distance Below Slab
HHW
NFPA 13 Table 8.6.2.2.1
Maximum spacing 4.6m (15 ft); deflector distance 25mm to 300mm below ceiling; escutcheons flush
Fire Protection QC Inspector
7.0
Pressure Testing
Hydrostatic Pressure Test at 200 psi (13.8 bar) for 2 Hours Continuous
HHH
NFPA 13 Section 25.2
Zero allowable pressure drop; zero visible weeping or drops at any grooved, threaded, or flanged joint
Fire QA/QC, Consultant & Civil Defense
8.0
Flushing
Underground Supply Line Flushing & Flow Alarm Test
HHW
NFPA 24 Chapter 10
Flushed at maximum available flow until discharge is clean; mechanical bell alarm sounds within 60s of flow
Commissioning Team & Consultant
Role Key:HHold Point: Mandatory sign-off requiredWWitness Point: Formal notification (inspect if present)RReview: Certificate / Submittal checkSSurveillance: Continuous audit check
Applicable Standards & Codes
NFPA 13: Standard for the Installation of Sprinkler Systems
NFPA 14: Standard for the Installation of Standpipe and Hose Systems
NFPA 25: Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems
UL 199: Standard for Automatic Sprinklers for Fire-Protection Service
FM Global Property Loss Prevention Data Sheets 2-0
Common Site QA/QC Mistakes
Painting over sprinkler heads during architectural ceiling spraying, which ruins the thermal activation trigger.
Omitting seismic sway bracing on fire protection risers and feed mains in seismic categories C through F.
Performing hydrostatic testing with unlisted or uncalibrated test gauges, violating NFPA 13 audit rules.
Mounting sprinkler deflectors too far below structural ceilings or too close to air conditioning ducts, blocking water spray.
Failing to support branch lines adjacent to end sprinkler drops, causing sprinkler pipe whip during pressure surges.
Technical Frequently Asked Questions
What is the required test pressure for automatic sprinkler systems under NFPA 13?
NFPA 13 Section 25.2 mandates that all new sprinkler piping systems must be hydrostatically tested at not less than 200 psi (13.8 bar), or 50 psi above the normal operating pressure if the working pressure exceeds 150 psi, held continuously for 2 hours with zero leakage.
Can grooved couplings be used on fire protection piping?
Yes. Roll-grooved or cut-grooved couplings are fully approved and widely preferred under NFPA 13, provided the fittings and gaskets are UL-listed and FM-approved for fire protection service.
What temperature rating is standard for commercial office sprinkler heads?
Standard response pendant sprinklers in typical commercial office spaces have a red liquid bulb rated at 68°C (155°F). Higher temperature heads (79°C yellow or 93°C green) are required in plant rooms, generator rooms, and beneath skylights.
