The discharge of a fire suppression system is the moment everything — the design, engineering, installation and maintenance — actually happens. Understanding what occurs at each stage helps operators, safety managers and procurement teams understand what they’re actually buying.
Stage 1: Fire Detection
In an LHD system, MusterWire reaches its rated temperature and sends an electrical signal to the alarm panel. In an LOP system, the pneumatic tube ruptures under heat, causing a pressure drop the panel senses. Either way, the panel receives a concrete signal and responds.
Stage 2: Alarm and Shutdown
The alarm panel enters fire mode. The audible alarm sounds first, before discharge, giving the operator a brief window to react. Simultaneously, the shutdown relay closes — cutting engine operation and reducing ongoing ignition risk.
Stage 3: Agent Discharge
The panel triggers the cylinder valve. Nitrogen pressure forces foam concentrate through the discharge network to all pre-positioned nozzles simultaneously. For SAG, the electrical activation signal triggers the chemical reaction and aerosol fills the protected enclosure. For IPS, the signal triggers dry powder discharge.
Stage 4: Event Logging
The alarm panel logs the activation event with timestamp data: detection input, activation time, discharge confirmation. This record supports post-incident review and compliance documentation.
After Discharge: What Needs to Happen
Recommissioning Requirements
The cylinder must be replaced or refilled, detection wire and nozzles inspected, and any component exposed to fire or discharge agent checked. The system must be recommissioned by a competent person per AS5062:2022 before returning to service.
Frequently Asked Questions
Seconds from detection to active discharge. Alarm, shutdown, then agent release in rapid sequence — faster than any manual response.
Yes. All nozzles activate together when the cylinder valve releases.
False activation requires the detection element to genuinely trigger. Continuous panel monitoring detects faults before they cause unintended discharge.
Cylinder recharge, component inspection and recommissioning by a competent person per AS5062:2022.
Know your system will perform when it matters
Talk to Muster about system commissioning, maintenance and post-discharge support.