General Regulations Regarding Heptafluoropropane

　　The heptafluoropropane fire suppression system is a well-known gaseous fire-extinguishing system widely used in the market. Today, we’ll discuss several key regulations and requirements that must be observed during the installation and construction of heptafluoropropane systems—primarily to enhance everyone’s awareness of gas-based fire safety, after all, the heptafluoropropane system itself involves a chemical substance.

　　1. What are the regulations regarding heptafluoropropane? When installing a gaseous fire suppression system, make sure to prepare the following technical documents:

　　1. Construction design drawings, design specifications, operation and maintenance manuals for the system and its key components, as well as installation guides.

　　2. Product certificates of system components such as container valves, selector valves, check valves, nozzles, and valve actuators are issued based on inspection reports from the National Quality Supervision, Inspection, and Testing Center. Additionally, fire-suppression agent delivery pipelines and their associated pipeline accessories must be accompanied by factory inspection reports and certificates of conformity.

　　3. For products used in the system that cannot be re-inspected—such as safety diaphragms—production factories must provide an inspection report and certificate of conformity for the same batch of products.

　　II. Construction of the gas fire suppression system shall proceed only after the following conditions are met:

　　1. The conditions set for the protected area and fire extinguishing agent storage cylinders comply with the design specifications.

　　2. The system components and main materials are fully available, and their varieties, specifications, and models must all meet the design requirements.

　　3. The embedded parts and holes required by the system meet the design specifications.

　　III. Before the installation of the gas fire suppression system, perform the following inspections on system components:

　　1. Visual inspection reveals no obvious deformation or damage; the surface coating remains intact, and the interface threads and flange sealing surfaces show no signs of damage.

　　2. For products in the system that cannot be re-inspected—such as safety diaphragms—production factories must provide an inspection report and certificate of conformity for the same batch of products. Additionally, gas check valves among the selector valves, cylinders, check valves, high-pressure hoses, and valve actuation devices must come with both hydrostatic pressure test reports and tightness test reports. The installation of the gaseous fire suppression system must strictly follow the design construction drawings and relevant technical documents; no unauthorized changes are permitted during the process. Each nozzle must deliver the designed flow rate, pressure, and spray duration as specified. If modifications are necessary, they can only proceed after obtaining approval from the original design authority.

　　Fourth, prepare construction records as required by the "Code for Construction and Acceptance of Gas Fire Extinguishing Systems," and also complete intermediate acceptance records for concealed areas such as underfloor spaces and above ceilings in the protected zones.

　　Fifth, in addition to complying with the provisions of the "Code for Construction and Acceptance of Gas Fire Extinguishing Systems," the fabrication of manifold pipes, installation of valves and high-pressure hoses, as well as the fabrication and installation of pipelines and supports, along with pipeline purging, testing, and painting, must also adhere to the relevant regulations outlined in the current national standard, "Code for Construction and Acceptance of Industrial Metal Pipelines."

　　Sixth, considering that this project is located within an underground station—thus falling under the category of underground structures—we must address the unique characteristics of such environments, including high humidity, susceptibility to condensation and water seepage, and poor ventilation. Therefore, during equipment installation and pipeline laying, construction should be tailored specifically to these conditions.

　　1. Pipeline installation should adjust the pipe slope according to the humidity levels of each room: generally, pipes in drier rooms should slope toward more humid rooms, while pipes in already humid rooms should slope toward even larger, more humid areas. The pipe slope should be maintained at around 5°.

　　2. Seal both ends of the conduit, and use fire-resistant sealing material at the wire exit point to prevent external moisture from entering the conduit. The sealing material has both soft and hard properties, allowing it to be easily removed when replacing the wiring.

　　3. All junction boxes and conduits shall use galvanized pipes, and each module box must be sealed during installation. Customized module boxes and terminal boxes equipped with sealing rubber rings will be used throughout the construction process.

　　4. Pipelines, pipeline equipment, various module boxes, terminal boxes, and alarm controllers must undergo rust removal treatment.