Material selection and quality inspection requirements for fire protection pipes

Fire pipes are mainly made of carbon steel. ‌

Steel pipes for fire protection mainly include seamless steel pipes and welded steel pipes. Its material is generally carbon steel, alloy steel or stainless steel. Among them, carbon steel refers to steel with a carbon content of less than 2.11%. It is a common material, has good processing and welding properties, and is relatively cheap; alloy steel has some alloying elements added, such as chromium, molybdenum, etc., and has more Good corrosion resistance and high temperature performance; stainless steel is steel with high corrosion resistance, but it is more expensive.

The material selection of fire pipes mainly considers its corrosion resistance, pressure resistance, aging resistance and other characteristics. ‌Carbon steel is one of the commonly used materials for fire pipes because of its good mechanical properties and corrosion resistance. ‌‌In addition, ‌the choice of fire pipes also involves specific usage scenarios and design requirements. ‌For example, fire foam pipes have no clear requirements for materials. ‌As long as they can prevent rust, they can be carbon steel, ‌galvanized pipes, etc. . ‌The flexible connecting pipe of the fire smoke exhaust fan is made of a variety of high-performance metal-organic materials and inorganic materials, ‌with high fire resistance, ‌acid and alkali resistance, ‌pressure resistance, and ‌aging resistance. ‌Fire-fighting plastic-coated steel pipe is also a commonly used fire-fighting water supply pipe. ‌It uses carbon steel such as Q235B or Q345B as the base material. ‌It is coated with polyethylene, ‌polypropylene and other polymer materials inside and outside, ‌it has excellent Corrosion resistance and fluid transfer properties. ‌

Although aluminum steel is also a feasible material, when it comes to the selection of fire pipes, carbon steel has become a more common choice due to its superior mechanical properties and corrosion resistance. ‌The design and material selection of the fire protection system need to consider a variety of factors, ‌ including the diameter of the pipe, ‌ connection method, ‌ pressure rating and whether special anti-corrosion treatment is required, ‌ to ensure the safety and reliability of the fire protection system.

Material selection and quality inspection requirements for fire protection pipes:

Physical testing requirements for fire pipe materials:
1. Appearance inspection: The tested pipes should have a smooth surface, no damage, no obvious deformation, and no defects such as cracks, burrs, obvious burning, etc.
2. Dimensional inspection: The dimensions of fire-fighting pipes should comply with relevant standards, and the length error should not exceed 10mm.
3. Heat resistance stability test: Fire pipes should be able to withstand long-term high temperature stability.
4. Impact resistance and tensile strength testing: Fire pipes should meet relevant performance requirements such as strength, impact resistance and low temperature resistance.

Mechanical testing requirements for fire pipe materials:
1. Axial tensile performance test: The tensile strength of fire-fighting pipes should meet the relevant performance indicators specified in the standard.
2. Bending strength and elastic modulus test: Fire pipes should be able to withstand the specified bending strength and elastic modulus.
3. Short-term strength test: Fire-fighting pipes should meet the relevant requirements for withstanding the specified load and specified temperature in a short period of time.

Chemical testing requirements for fire pipe materials:
1. Component analysis: The material components used in fire-fighting pipes should comply with relevant standards.
2. Chemical resistance performance test: Fire pipes should be able to withstand the erosion and corrosion of chemicals with specified concentrations.

Special testing requirements for fire pipe materials:
1. Fracture toughness and thermal stability test: Fire pipes should meet the specified fracture toughness and thermal stability.
2. Flame retardant performance test: Fire pipes should have good flame retardant properties.

To sum up, the fire pipe material testing requirements cover physical, mechanical, chemical and other performance indicators to ensure the reliability and safety of fire pipes. When purchasing fire-fighting pipes, it is necessary to refer to relevant standards and regulations for testing to improve fire safety levels while ensuring quality.

Read more: Quality requirements for fire-fighting pipe fittings