Direct Low pressure system - Fire detection tube technology , FIRE SUPPRESSION SYSTEM , Electrical Panels tube based automatic fire gas suppression system
29-Nov-2025
Uninterruptible Power Supply (UPS) systems are the backbone of every mission-critical facility—data centers, telecom sites, industrial automation, hospitals, banks and IT infrastructure. As power electronics operate continuously, the risk of electrical short circuits, overheating, cable insulation failure and battery-related ignition becomes a major fire hazard.
Traditional suppression methods often fail to address cabinet-level fire outbreaks, making localized protection essential.
Tube-Based Direct Low Pressure (DLP) Fire Suppression System is the smartest and most reliable solution to protect UPS panels, battery cabinets and power electronic enclosures. This blog explains how DLP technology works, its components, benefits, installation guidelines and why it is the best choice for UPS fire safety.
A DLP (Direct Low Pressure) system is a compact, automatic fire suppression technology that uses a heat-sensitive polymer detection tube routed inside the UPS cabinet. The tube works as both fire detector and extinguishing agent delivery line, providing instant suppression exactly at the point of fire.
When high temperature builds up at any location inside the UPS, the tube bursts at that hotspot, releasing the fire-suppression agent directly onto the source—ensuring immediate localised extinguishing without damaging the entire room or equipment.
UPS cabinets contain:
High-current busbars
SMPS boards
Transformers & rectifiers
Battery strings
Control circuits
Cable joints and terminals
These components run continuously and generate heat. Even a single loose connection or dust accumulation may create sparks or arc faults. Fires inside UPS cabinets spread rapidly and are difficult to detect externally.
Tube-based DLP systems offer:
Ultra-fast response
No dependency on smoke detectors
Fire control directly on the ignition point
Protection even in small, enclosed volumes
No need for room sealing
Minimal agent use and zero residue (with clean agents)
Due to overheating, short circuit or battery failure.
Special polymer tubing softens & bursts at a preset temperature (typically 90–120°C).
The tube near the hotspot ruptures, forming a nozzle.
Clean agent exits at low pressure, instantly knocking down flames.
System can be integrated with:
Alarm panel
BMS
Remote monitoring
Auto power cutoff signals
Fire detection + discharge in one
Routes inside UPS and battery cabinets
Temperature-responsive and reliable
Stores extinguishing agent such as:
FK-5-1-12 (clean agent)
Novec-type agents
Low-conductivity suppression liquids (optional)
Monitors system health; sends alarms if pressure drops.
Ensures the tube loop is sealed and monitored.
Enables remote OR automatic activation.
Displays:
Fire
Fault
Gas release
Power failure
Shutdown relay outputs
Agent released exactly where the fire begins.
System operates purely by heat, independent of power.
Clean agents are non-conductive, residue-free and safe for live electrical equipment.
Fits inside the cabinet; no piping or room sealing required.
Simple construction reduces failure rates.
Easily installed on existing UPS cabinets without structural changes.
Uses minimal extinguishing agent compared to room flooding systems.
Control, power and inverter modules.
Prevents thermal runaway escalation.
Critical IT infrastructure.
Automation, CNC, PLC, robotics, etc.
Tube routing should cover heating components:
Busbars
Transformers
Battery terminals
Power modules
Secure tubing every 25–30 cm
Avoid sharp bends or edges
Install cylinder outside or near cabinet
Integrate with alarm / BMS for remote alert
Ensure cabinet volume is correctly calculated for agent sizing
Conduct periodic pressure checks & visual inspections
Visual inspection of tube & cylinder pressure
Ensure no mechanical damage or loose routing
Alarm testing
End-of-line pressure check
Complete system audit
Replace aged components if needed
Re-pressurization (if required)
No. Clean agents used in DLP systems are non-conductive and residue-free.
Yes, a burst occurs at the fire point. After discharge, only the tube must be replaced.
Yes, the system is fully mechanical and heat-activated.
Yes—when designed with correct tube routing and agent selection.
Typically 1–2 hours per cabinet depending on size.
Unlike traditional systems that detect smoke or heat in the room, a DLP system detects fire inside the UPS cabinet itself, using a heat-sensitive tube that bursts at the fire point and discharges agent instantly.
Yes. No electricity, sensors or human intervention is required. Fire activates the system instantly.
Typically 90°C to 140°C, depending on the selected tube material. Custom activation temperatures are also available.
Tube-based systems follow international clean agent safety standards. Certifications depend on manufacturer (UL-listed components, ISO approvals, etc.).
Fire Engineering Technology systems comply with applicable safety norms for clean agents and tube technologies.
Yes—clean agents used in DLP systems are non-conductive, safe for energized equipment, and do not cause short circuits.
No. Clean agent systems used in UPS protection are zero residue and do not harm electronics.
Activation is instant—the tube bursts the moment surrounding temperature reaches its designed limit, allowing rapid extinguishing before fire spreads.
Class C (electrical fires) and Class A (insulation/cable fires).
It is not intended for deep-seated chemical fires or open-area fires.
Yes. The agent cylinder is pre-pressurized. A pressure gauge and pressure switch continuously monitor system readiness.
A pressure drop will be detected, triggering a fault alarm (if connected to MCU), ensuring safety before the system becomes inactive.
Yes. The optional master control unit provides NO/NC relays that can signal:
UPS shutdown
Battery isolator cut-off
Main breaker trip
Local/remote alarms
Typically 5–20 seconds, depending on the cylinder size and nozzle opening.
3 to 5 years depending on environment, UV exposure, and cabinet temperature. Regular inspection is required.
Yes, the tube is flexible and customizable. It can be installed in:
Small indoor UPS
Large data-center UPS modules
Battery racks and enclosures
Telecom/equipment cabinets
No major modifications. Tube routing requires simple clamps and fittings, making it ideal for retrofit.
No. Unlike room-flooding gas systems, DLP protects only the cabinet, so room sealing is unnecessary.
A quick visual check of pressure gauge + tube condition.
If connected to MCU → automatic fault/alarm monitoring.
Yes, as long as room temperature stays below 50–55°C. The tube only bursts at high localized heat inside UPS, not ambient heat.
Fire Engineering Technology is a leading manufacturer of heat-sensing tube-based automatic fire suppression systems for electrical panels, UPS systems, battery cabinets, DG sets, CNC machines and enclosures.
Our systems are:
Precision engineered
Highly reliable
Easy to install
Tested for instant activation
Compliant with global safety practices
We provide complete solutions including design, supply, installation & AMC support.
A Tube-Based Direct Low Pressure (DLP) Fire Suppression System is the most advanced and cost-effective method to safeguard UPS systems from internal electrical fires. With ultra-fast activation, clean agent discharge and minimal maintenance, it ensures uninterrupted power and protects valuable IT infrastructure from catastrophic damage.
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