Submerged Arc Welded (SAW) steel pipes are commonly used in various industries for transporting fluids and gases. These pipes are manufactured by forming and welding a steel strip into a tube, which can be produced in different grades according to the API 5L standard. Here are some applications of SAW steel pipes with different API 5L levels:

1. API 5L Grade A, B, X42: These lower-strength grades are typically used for conveying water, oil, and gas in both the oil and natural gas industries. They are suitable for general-purpose applications where the requirements for strength and corrosion resistance are not as stringent.

2. API 5L Grade X52, X56: These intermediate-strength grades are commonly used in offshore and deepwater oil and gas pipelines. They are also suitable for transportation of natural gas and oil in various environments, including harsh conditions.

3. API 5L Grade X60, X65: These high-strength grades are often used in pipelines for transporting oil and gas in challenging environments such as deep-sea drilling, arctic regions, and areas with high pressure and high temperature conditions. They are also used in pipeline projects that require high strength and resistance to corrosion and cracking.

4. API 5L Grade X46: This intermediate-strength grade is commonly used in pipelines for the transportation of natural gas, oil, and petrochemicals. It is suitable for applications where moderate strength and good weldability are required.

5. API 5L Grade X70: This high-strength grade is frequently utilized in the construction of long-distance pipelines for oil and gas transmission. It is well-suited for applications requiring a higher level of strength and toughness to withstand the operating conditions.

6. API 5L Grade X80: Known for its high-strength properties, the X80 grade is often employed in challenging environments such as deep-sea pipelines and regions with extreme temperatures. It is suitable for applications where both strength and resistance to corrosion are critical.

7. API 5L Grade X100: This ultra-high-strength grade is used in specialized applications that demand exceptional strength and performance characteristics. It is typically found in projects where the pipeline needs to withstand very high pressures and harsh operating conditions.

8. API 5L Grade X120 and Beyond: Grades like X120 and higher are designed for specific projects that require exceptional strength and durability. These grades are utilized in applications where extreme conditions, high pressures, and corrosive environments are prevalent, ensuring the pipeline's reliability and longevity.

SAW steel pipes manufactured to different API 5L levels cater to a wide range of applications in the oil and gas industry, petrochemical sector, and various infrastructure projects. The selection of the appropriate grade relies on factors such as the nature of the transported material, operating conditions, environmental factors, and regulatory requirements. By choosing the right API 5L grade for SAW steel pipes, engineers and project managers can ensure the integrity and performance of the pipeline system throughout its service life.