CO₂ Suppression
High-density CO₂ protection for unoccupied spaces
Overview
A carbon dioxide (CO₂) system suppresses fire by rapidly diluting oxygen (asphyxiation). It is preferred for unoccupied or controlled-evacuation machinery, generator, turbine and flammable-liquid spaces. Because of its asphyxiant effect, alarm, delay and manual lock-off measures are mandatory in occupied areas. A-Pro designs to TS ISO 6183 and NFPA 12.
How it works
Oxygen Dilution
Lowers ambient oxygen to a level that stops combustion; effective on deep-seated fires.
Non-Conductive & Residue-Free
Does not harm electrical installations and leaves no residue after discharge.
High/Low-Pressure Storage
Large-volume protection via cylinder banks (high pressure) or refrigerated tank (low pressure).
Safety Sequence
Pre-discharge alarm, time delay and manual lock-off safeguard personnel.
Our delivery process
- 01
Survey & Risk Analysis
Site assessment of volume, personnel access and hazard class.
- 02
Concentration & Time Calculation
TS ISO 6183 / NFPA 12 based CO₂ quantity and hold time.
- 03
Storage Selection
High-pressure cylinder bank or low-pressure tank selection and layout.
- 04
Nozzle & Pipe Design
Total flooding or local application nozzle layout and pipe sizing.
- 05
Safety & Cause/Effect
Pre-discharge alarm, delay, manual lock-off and ventilation shutdown integration.
- 06
Testing & Commissioning
Scenario testing, acceptance and personnel training at handover.
Maintenance & periodic inspection
As CO₂ systems hold high pressure, periodic inspection is critical; A-Pro offers a maintenance contract.
- Cylinder/tank weight and pressure check
- Hose, manifold and nozzle inspection
- Pre-discharge alarm and delay test
- Manual lock-off and warning signage check
- Ventilation shutdown and damper integration test
Frequently asked questions
Is CO₂ used in occupied spaces?+
Due to its asphyxiant effect, direct total flooding is not recommended in occupied spaces; where used, alarm, time delay and manual lock-off are mandatory. It is generally preferred for unoccupied spaces.
How does CO₂ suppress?+
It dilutes ambient oxygen to a level that stops combustion (asphyxiation) and partly cools; effective on deep-seated fires.
Where is it preferred?+
For turbine/generator enclosures, flammable-liquid booths, machinery rooms and unoccupied process equipment.
Difference from clean agents?+
CO₂ is inert and low-cost but asphyxiant; FM200/NOVEC are clean agents with wide safety margins for occupied spaces.
Is there residue after discharge?+
No. CO₂ is residue-free and non-conductive; however the space must be safely ventilated after discharge.
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