Product Overview of the Externally Pressurized HFC‑227ea Fire Suppression System, 5.6 MPa

• Externally pressurized heptafluoropropane ( HFC-227ea ) Introduction to Fire Suppression Systems

Heptafluoropropane ( HFC-227ea ) Fire extinguishing agents are gaseous agents that extinguish fires through physical means and, to some extent, chemical means. They are characterized by being colorless, odorless, electrically insulating, and free from secondary pollution. In particular, they do not deplete the atmospheric ozone layer, thereby meeting environmental protection requirements; they are halocarbon-based. 1211、1301 An ideal substitute.

The externally pressurized HFC‑227ea fire suppression system stores the HFC‑227ea extinguishing agent in liquid form within a container, without using nitrogen for pressurization. Instead, the compressed gas that serves as the propellant for discharge is stored at a higher pressure in a separate vessel. During operation, the high-pressure propellant gas is reduced in pressure by a pressure-reducing check valve and then injected into the extinguishing-agent storage cylinder (while the cylinder’s container valve remains open). The propellant gas drives the extinguishing agent through the piping network at high velocity, delivering it to the nozzles in the protected area for discharge.

Our company manufactures externally stored, pressurized heptafluoropropane ( HFC-227ea ) The fire suppression system employs advanced technologies from both domestic and international sources, and its differential-pressure container valves, diaphragm-type container valves, and selection valves have all received high praise within the industry. The system boasts numerous advantages, including:

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         1. The delivery distance of the fire extinguishing agent has been significantly increased, with a maximum range of 150m The above is more suitable for long-distance delivery and large-space protection zones.
         2. The filling density of fire-extinguishing agent containers has been increased, with a maximum filling density of 1250Kg/m³ , which enables more efficient utilization of container volume, reduces equipment investment, and minimizes the footprint of the cylinder storage area;
         3. High nozzle inlet pressure improves the atomization of the extinguishing agent, shortens its discharge time, and enhances its fire‑extinguishing performance.

• Main Technical Parameters of the System

• System Operation Procedure Block Diagram

• System Architecture Diagram 
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     1. Unit-independent system configuration type

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      2. Configuration Type of Combined Distribution System

Main Performance Parameters

Automatic Control:

When the protected area is unoccupied, set the control mode selector switch on the gas fire‑extinguishing controller to the automatic position, placing the fire‑suppression system in automatic operation. If a fire occurs in the protected area, the fire detectors will transmit a fire signal, triggering the alarm to emit both audible and visual alerts while simultaneously issuing interlock commands to shut down all associated equipment, after which… 0 ~ 30 After a delay of several seconds, a fire‑extinguishing command is issued, activating the solenoid to open the electromagnetic container valve and release the driving gas. The driving gas flows through the drive line to open the selection valve (in a combined distribution system) and the container valve of the pressurized gas cylinder bank, thereby releasing the pressurizing gas. This pressurizing gas then opens the container valve of the extinguishing agent cylinder bank while simultaneously propelling the extinguishing agent for discharge, thus initiating fire suppression.

Electrical Manual Control:  

When personnel are working or on duty within the protected area, set the control mode selector switch on the gas fire‑extinguishing controller to the Manual position, placing the system in manual control. In the event of a fire in the protected area, pressing the emergency start button at the entrance or the start button on the gas fire‑extinguishing controller will initiate the extinguishing system and carry out fire suppression according to the procedures outlined above.

Mechanical emergency manual operation:

When a fire occurs in the protected area and the gas‑extinguishing control panel fails to issue an extinguishing command, personnel within the area should be immediately evacuated, linked equipment should be shut down, and the limit switch of the solenoid actuator on the drive‑gas cylinder assembly for that zone should first be released. Then, by pressing the manual button on top, the fire‑extinguishing system can be initiated according to the procedure described above to carry out suppression. If, at this point, the solenoid actuator fails to operate, first open the handle of the corresponding selector valve to release the pressure arm, and then individually open the container valves on the associated pressurized‑gas storage cylinders to discharge the pressurizing gas, thereby propelling the extinguishing agent and effecting fire suppression.

Delayed discrimination:

When a fire alarm is triggered, if it is determined within the delay period that activation of the fire suppression system is not required, pressing the emergency stop button or the red emergency stop button on the gas fire suppression control panel will prevent the fire suppression command from being issued.

FAQ for 5.6 MPa Externally Pressurized HFC‑227ea Fire Suppression Systems

Q: What types of facilities are suitable for an externally pressurized 5.6 MPa heptafluoropropane fire suppression system?

A: Suitable for large protected areas such as computer rooms, distribution rooms, archives, and energy storage compartments, it can extinguish Class A, B, and C fires, as well as energized electrical fires.

Q: What is the difference between an externally pressurized 5.6 MPa system and an internally pressurized heptafluoropropane system?

A: The external‑pressure fire‑extinguishing agent cylinder assembly and the driver gas cylinder are installed separately, with a storage pressure of 5.6 MPa. This configuration allows for longer delivery distances, making it well suited for large‑space protection requiring long‑distance agent delivery.

Q: What startup methods does the system support?

A: It features three activation modes—automatic, manual, and mechanical emergency—and can be connected to a fire alarm control panel to enable interlocked gas‑based fire suppression triggered by smoke and heat detectors.

Q: What does 5.6 MPa signify?

A: Refers to the rated storage pressure of the fire-extinguishing agent cylinder, which is 5.6 MPa—this is the factory‑specified storage pressure parameter for the system.

Q: What are the key considerations for system installation and construction?

A: The cylinder bank shall be installed in a dedicated cylinder room. Piping shall be pressure‑tested in accordance with applicable codes, and nozzle placement shall ensure uniform coverage of the protected area. Pipelines must be routed to avoid kinks and leaks.

Q: What items should be inspected during routine maintenance?

A: Regularly inspect the cylinder pressure gauge, cylinder valve, and pipeline fittings for leaks; verify the functionality of the alarm control equipment; and check the cylinder bank’s exterior for rust or damage.

Q: What effects does the discharge of heptafluoropropane gas have on personnel within the protected area?

A: Prior to gas discharge, an audible and visual alarm will be activated, and personnel must evacuate promptly. Entry into the protected area is prohibited during the discharge period and may only be permitted after adequate ventilation.

Q: Will the chemical spray damage precision electronic equipment?

A: Heptafluoropropane is a clean agent that leaves no particulate residue, exhibits minimal corrosivity to precision electrical equipment, and requires only brief ventilation after extinguishing a fire.

Q: Can the agent be refilled on-site after it has been released?

A: After discharge, the system must be transported back to the factory by a qualified fire‑protection contractor for inspection, recharging of the extinguishing agent, and pressure verification; on‑site refilling is not permitted.

Q: Does this system comply with fire safety acceptance requirements?  

A: The product is accompanied by a fire‑safety inspection report, complies with relevant gas‑extinguishing standards, and may participate in the project’s overall fire‑safety acceptance upon completion of installation and commissioning.