2. Types and characteristics
Spiral pipes can be divided into many types according to different welding methods and materials:

1. Single-sided welded spiral pipe: only welded on one side, suitable for general fluid transportation and structural pipes.

2. Double-sided welded spiral pipe: welded on both sides, with higher strength and sealing, suitable for high-pressure fluid transportation and structural engineering and other fields.

3. Ordinary spiral steel pipe: It is the most common type of spiral steel pipe, with simple manufacturing process and low cost, suitable for general demand occasions.

4. Welded spiral steel pipe: It has good welding performance and strength, and is widely used in high-pressure fluid transportation, structural engineering, pile foundation support and other fields.

5. Double-sided submerged arc spiral steel pipe: It is a high-end product with good corrosion resistance and pressure resistance. It is mainly used in important engineering projects, offshore platform construction and other high-demand environments.

6. Corrosion-resistant spiral steel pipe: Made of special anti-corrosion materials, it is suitable for chemical industry, marine engineering, sewage treatment and other fields with high corrosion resistance requirements.

7. Low-temperature spiral steel pipe: It is mainly used for transportation in low-temperature environments, with good low-temperature toughness and cold resistance, and is widely used in liquefied natural gas, liquid nitrogen transportation and other fields

3. Performance and Use
Spiral pipes have high strength and corrosion resistance, can withstand high pressure and high temperature, and are therefore widely used in various fields:

1. Petroleum and natural gas industry: used for long-distance transportation of petroleum and natural gas, as well as gathering and transportation pipelines of oil fields and gas fields.

2. Energy and power: used for cooling water systems, steam and flue gas emission systems of thermal power plants, etc.

3. Civil engineering: Spiral steel pipes are often used in foundation pit support, bank protection engineering, geological exploration and other fields, with good compressive resistance and stability.

4. Infrastructure engineering: Spiral steel pipes can be used in infrastructure construction such as urban drainage systems, sewage treatment plants, and water supply projects.

5. Pressure vessels: Spiral pipes are often used to manufacture pressure vessels, such as boilers, reactors, etc., which can withstand high temperature and high pressure working environments.

6. Boiler construction: Spiral pipes can be used to manufacture the heating surface and shell of boilers, which can ensure the normal operation of boilers under high temperature and high pressure environments.

7. Construction: Spiral pipes are also widely used in the construction field, such as drainage pipes for high-rise buildings, underground water conservancy and municipal sewage pipes.

8. Transportation: Spiral pipes are also widely used in transportation construction such as roads, railways, bridges, etc., and can be used as drainage pipes for bridges, tunnels, subways, underground passages, etc.