1. 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, thus meeting environmental protection requirements; they are halocarbons. 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:

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, reduces the discharge time, and enhances its fire‑extinguishing performance.

1. Main Technical Parameters of the System 

III. Block Diagram of the System Operation Procedure 

IV. System Architecture Diagram

Unit-independent system configuration type

1. Configuration Type of Combined Distribution System
2. Main system components 
3. Fire extinguishing agent cylinder assembly 
   1. Structure 

The fire-extinguishing agent cylinder assembly consists of the extinguishing agent and its container, a container valve, and an initiating device.

Installation (pilot valve), safety relief device, fire-extinguishing agent sampling port,

It consists of a siphon, a liquid-level alarm device, a pressure-reducing valve, and other components.

(As shown in the figure.)

1. Main Performance Parameters 

1. Purpose 

The extinguishing agent cylinder assembly is the primary component used for storing and releasing the extinguishing agent.

1. Fire Extinguisher Cylinder Assembly Fire Extinguishing Agent Leak Inspection 

Use the liquid-level alarm device to inspect the fire-extinguishing agent cylinder assembly for leaks: when the actual liquid level height in the cylinder assembly, converted to weight, falls below the nominal filling weight. 5% At that time, the alarm device emits both audible and visual alerts: the yellow light flashes while the buzzer sounds an alarm. Following an alarm, the cause must be promptly identified, and measures to prevent further leakage should be implemented. The extinguishing agent should also be replenished without delay to avoid system failure due to agent loss.

1. Operation and Maintenance Instructions 

During transportation, the fire‑extinguishing agent cylinder assembly must not be laid on its side, and the pressure‑reducing valve, container valve, or connecting pipelines must not be used as points of force application or handholds. During installation, the cylinder assembly and any protruding components on it must not be used as climbing aids or footholds; furthermore, all connecting pipelines must be kept intact and undamaged. The ambient temperature at which the fire‑extinguishing agent cylinder assembly is stored must be within… 0 ~ 50 °C Within the scope.

1. Safety Precautions 

Store in a cool, well-ventilated, dry place, away from sources of ignition and heat, and protect from direct sunlight.

FAQ for Externally Pressurized HFC‑227ea Fire Suppression Systems, 4.2 MPa

Q: What types of facilities are suitable for an externally pressurized 4.2 MPa heptafluoropropane fire suppression system?  

A: Suitable for medium- to large-sized protected areas such as computer rooms, distribution rooms, archives, and energy storage compartments; capable of extinguishing Class A, B, and C fires, as well as energized electrical fires.

Q: What is the difference between 4.2 MPa and 5.6 MPa external‑pressure HFC‑227ea systems?

A: The two systems have different rated storage pressures; the 4.2 MPa system operates at a lower pressure, offers moderate delivery distances, places less demand on pipeline pressure ratings, and requires different selection of accompanying fittings.

Q: What are the different activation modes of an externally pressurized heptafluoropropane fire suppression system?  

A: It features three activation modes—automatic, manual, and mechanical emergency—and can be integrated with a fire alarm control panel. The system is triggered to discharge via interlock with smoke and heat detectors.

Q: What does 4.2 MPa mean?

A: Refers to the rated storage pressure of 4.2 MPa for the fire-extinguishing agent cylinder, which is the factory‑specified design parameter for the agent storage pressure of this system model.

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

A: The cylinder assembly is installed in a dedicated cylinder room, and the piping is pressure‑tested in accordance with applicable standards. Nozzles are strategically positioned to ensure complete coverage of the extinguishing agent, and all pipe joints are properly sealed to prevent leakage.

Q: What items should be checked during routine inspections and maintenance?

A: Regularly check the pressure gauge readings on the cylinders, inspect cylinder valves and pipeline fittings for leaks, verify the alarm control equipment, and examine the cylinder bank for signs of rust or deformation.

Q: What are the effects of a heptafluoropropane discharge on personnel within the protected area?

A: Prior to system discharge, an audible and visual alarm will activate, and personnel must evacuate promptly. Entry into the protected area is strictly prohibited during discharge; access is permitted only after thorough ventilation.

Q: Will the chemical spray damage precision electronic equipment?

A: Heptafluoropropane is a clean agent that leaves no particulate residue and exhibits extremely low corrosivity, making it safe for sensitive electrical equipment in server rooms; after extinguishing, simply ventilate the area.

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

A: On-site refilling is not permitted. After discharge, the cylinders must be returned to a qualified fire‑safety organization for inspection, recharging of the extinguishing agent, and pressure adjustment.

Q: Can this system meet the requirements for fire safety project acceptance?

A: The product is accompanied by a fire‑safety inspection report and complies with relevant gas‑extinguishing standards. Upon completion of installation and commissioning, it can be integrated with the protected area to facilitate overall fire‑safety acceptance.