1. Q: What are the main differences between domestic and international fire protection steel pipe material standards?
A:
Domestic: GB/T 3091-2015 (galvanized welded steel pipe) and GB/T 8163-2018 (seamless steel pipe) are commonly used, with Q235B and 20# steel being the primary materials.
International: The United States uses ASTM A53 (galvanized/seamless steel pipe) and ASTM A106 (high-temperature seamless steel pipe), while Europe commonly uses EN 10255 (welded steel pipe).
For example: Domestic fire hydrant pipes often use Q235B galvanized steel pipe, while US projects may require ASTM A53 Grade B steel pipe.
2. Q: What are the differences in anti-corrosion requirements?
A:
Domestic: The galvanized layer thickness must be ≥ 60μm (GB/T 13912). Buried pipes require enhanced anti-corrosion protection (such as 3PE). Internationally: ASTM A53 requires a galvanized coating thickness of ≥ 85μm (zinc coating weight ≥ 610g/m²), while European EN 10255 may require hot-dip galvanizing plus coating.
For example, a project in the Middle East requires fire protection pipes to have a galvanized coating that complies with ASTM A153, which is thicker than the national standard.
3. Q: What are the differences between pressure ratings and test standards?
A:
In China: The hydrostatic test is 1.5 times the working pressure (GB 50974), and the design pressure is typically ≤ 2.5MPa.
Internationally: ASTM standards require higher test pressures (e.g., 1.5-2 times the working pressure) and require additional nondestructive testing (e.g., UT).
For example, the fire protection piping for an overseas petrochemical project was designed according to ASME B31.3, with a test pressure of up to 4.0MPa.
4. Q: What are the differences in connection standards?
A:
In China: Grooved connections must comply with CJ/T 156, while threaded connections refer to GB/T 7306. Internationally: The ANSI/ASME B16.5 flange standard is commonly used in the United States, while Europe tends to favor EN 1092-1 flanges.
For example: Grooved clamps are often used for DN100 pipes in China, while European projects may require EN 14420 standard clamps.
5. Q: What are the differences between the certification and acceptance processes?
A:
In China: Fire protection product CCC certification (e.g., GB 5135.11) is required, and acceptance is based on GB 50281.
Internationally: UL/FM certification is required in the United States, and CE certification (e.g., EN 10255+CPR) is required in Europe.
For example: Fire protection steel pipes exported to Australia must meet AS 1074 standards and pass WaterMark certification.
Summary (Updated August 21, 2025)
The differences between domestic and international standards primarily lie in five key areas: material, corrosion resistance, pressure rating, connection method, and certification. In practice, the selection should be based on the mandatory standards of the project's location. For example:
Domestic projects: GB standards are preferred.
Overseas projects: ASTM/EN/AS standards should be combined, and local certification requirements (such as UL or CE) should be considered.
