EN
Wet, Dry and Gas Fire Extinguishing Systems Inspection
Periodic inspection of wet, dry and gas fire extinguishing systems: sprinkler-hydrant lines, pump sets, cylinder banks and functional tests. Signed reports.
Periodic inspection of wet, dry and gas fire extinguishing systems covers sprinkler and hydrant lines, foam systems and gas extinguishing groups such as FM-200, CO₂ and Novec 1230. Pressure and supervisory checks, pump performance trials, detector integration and nozzle/cylinder integrity are tested at least annually by authorised engineers. The purpose is to prove with measurements that a system that must act in the first minutes of a fire will really work at that moment.
System Types and Inspection Focus
- Wet sprinkler: Alarm valve, jockey-main-electric-diesel pump set, pressure switches, unsprayed and free sprinkler heads, line pressure and end test valve flow verification.
- Dry pipe system: Air pressure monitoring of the pipe, leakage and flow (evacuation) switch; critical in freezing warehouses.
- Gas system: Cylinder weighing (fill level check), selector valve, delay-detection dialogue, room enclosure (leakage) test and emergency stop button function.
- Foam and hydrant: Tank foam concentrate proportioning, completeness of cabinet contents, hydrant valve-strength and reach control.
What the Annual Controls Include
- Pump set: weekly and monthly diesel-jockey trials and annual full-capacity performance curve measurement; suction-discharge gauges and pressure drop evaluation.
- Line and network pressure measurement; flow verification at the end test valve.
- Detection-gas release dialogue: zone detectors with delay time, auto-manual changeover and acoustic-optical alarm test.
- Cylinder bank: leak monitoring by weighing or pressure reading; scheduling cylinders due for hydrostatic re-qualification.
- Obstructions: stacked load/rack control above nozzles and detectors (the most frequent field non-compliance).
Legislation and Standards
Inspection periods are fixed by the Regulation on Protection Against Fire in Buildings and the maintenance-testing duty of Law No. 6331. Technical references: TS EN 12845 and NFPA 25 for sprinkler design and maintenance, the TS EN 15004 series for gas systems, NFPA 12 / TS EN 1089-3 for CO₂ and TS EN 12845 / NFPA 20 for fire pumps. Per the regulation, extinguishing systems are checked and reported at least once a year by authorised engineers; pump performance tests repeat at defined periods.
Risks and Operator Recommendations
The most frequent findings: a zone valve left locked closed, rack load above a nozzle, the main pump cycling unnecessarily because the jockey cannot match a hidden leak, and uncontrolled openings in gas protected rooms. Falling air pressure on a dry system may signal a cracked pipe — the alarm must never be silenced. Shift-based visual checks of cabinets and hydrants, combined with the annual report, secure a full score in audits. Post-rectification test records must be kept as closure evidence.
Outcome
At the end of the annual trial, a signed report with measured values and a rectification plan is issued. Extinguishing systems sit in our Periodic Inspection of Installations group. For the detection side see Fire Detection and Alarm Systems and for portables Portable Extinguishers; contact us for a quotation.
FAQ on Wet, Dry & Gas Fire Extinguishing Inspection
Water systems (sprinkler wet-dry-pre-action-deluge, indoor and outdoor hydrant, foam), gas suppression (inert gas, clean agent, CO2) and dry powder applications. The control documents that the system is not only present but working and ready: water source-pumping, pressure-flow, nozzle-pipe integrity, release-detection chain, cylinder pressure-fill state and scenario verification.
Under the Fire Buildings Regulation and Law No. 6331, fire installations run annual periodic control; with NFPA 25 (water maintenance), TS EN 12845 (sprinkler) and EN 12094 (gas control devices) practice the water side stages into annual-three-five-ten yearly trials. Gas cylinders are weighed and leak-checked per the manufacturer calendar (usually half-year to year); integrated scenario tests with the detection system are planned separately.
Pump-jockey set automatic start-pressure-flow test and operating point control, main valves and post-indicator valve positions, sprinkler endpoint and last station trials, wet alarm test valve with staged line drain, pipe hanger-vibration and corrosion observation; on gas: selector valve-nozzle-pipe network, staged delay-automatic-manual discharge-evacuation announcement, cylinder weighing (fill and leak percentage limit), fuse-membrane state, pressure switch settings and room enclosure integrity test. The scenario — detection-announcement-door-damper-suppression chain — is tried end to end.
A left-closed main valve, dead jockey or electric pump, blocked-painted-bent sprinkler head, missing spare head stock, cylinder under charge limit, disabled zone with strapped detector, mis-set delay-alarm microswitch and a room failing the enclosure test: these show the system is in a faulty, unreliable state. The report issues level tags and a timed correction plan; critical gaps are notified to the operator in writing for insurance and fire authorities.