When it comes to using Submerged Arc Welded (SAW) steel pipes for onshore pipe piles, several key requirements need to be considered to ensure the durability, strength, and longevity of the piles. Here are some essential requirements for SSAW Steel Pipes used in onshore pipe pile applications:

1. Material Grade:

The material used for the SSAW steel pipes should meet the specified grade requirements, typically in line with international standards such as API 5L or ASTM A252. Common grades include API 5L Grade B/X42/X52/X60 and ASTM A252 Grade 2/3.

2. Pipe Diameter and Wall Thickness:

The diameter and wall thickness of the SSAW steel pipes should be selected based on the design requirements, including load-bearing capacity, soil conditions, and pile design specifications.

3. Pipe Length:

The length of the SSAW steel pipes should be suitable for the desired pile depth and installation method, ensuring adequate penetration into the soil to achieve the required load-bearing capacity.

4. Welding Quality:

High-quality welding is crucial to ensure the integrity and strength of the SSAW steel pipes. Welding procedures should comply with industry standards and be performed by qualified welders.

5. Coating and Protection:

Consideration should be given to the coating and protection of the SSAW steel pipes to prevent corrosion and ensure long-term durability. Common coatings include fusion-bonded epoxy (FBE), bitumen, or polyethylene.

6. Mechanical Properties:

The SSAW steel pipes should possess the necessary mechanical properties, including yield strength, tensile strength, and elongation, to meet the structural requirements of onshore pipe piles.

7. Dimensional Tolerances:

The dimensions of the SSAW steel pipes should adhere to specified tolerances to ensure proper fit and alignment during pile installation and construction.

8. Non-Destructive Testing (NDT):

NDT methods such as ultrasonic testing (UT), radiographic testing (RT), and magnetic particle inspection (MPI) should be conducted to detect any defects or imperfections in the welds and steel material.

9. Quality Control and Certification:

Ensure that the SSAW steel pipes are manufactured under a quality control system that complies with relevant standards and regulations. Certifications from recognized bodies may also be required.

10. Handling and Transportation:

Proper handling and transportation practices should be followed to prevent damage to the SSAW steel pipes during storage, loading, unloading, and installation.

11. Weld Seam Quality:

The quality of the weld seam is critical for the overall integrity of the SSAW steel pipes. Ensure that the weld seam is smooth, free from defects, and meets the specified welding standards.

12. End Configuration:

The ends of the SSAW steel pipes should be properly configured to facilitate connections with other pipes or pile components. End treatments such as beveling, threading, or flanging may be required.

13. Corrosion Protection:

In onshore environments where pipes are exposed to corrosive elements in the soil or atmosphere, proper corrosion protection measures should be implemented. This can include additional coatings, cathodic protection, or corrosion-resistant materials.

14. Joint Integrity:

For applications where multiple pipes are joined together to form longer pile sections, the joint integrity is crucial. Ensure that joints are properly aligned, welded, and inspected to maintain the structural integrity of the pile.

15. Load Capacity:

The SSAW steel pipes should be selected based on their load-bearing capacity, considering factors such as the expected loads, soil conditions, and design requirements of the onshore pipe piles.

16. Installation Requirements:

Consideration should be given to the installation method of the pipe piles. Ensure that the SSAW steel pipes are designed and fabricated to withstand the installation process, including driving, jacking, or other methods.

17. Compatibility with Pile Driving Equipment:

Ensure that the SSAW steel pipes are compatible with the pile driving equipment being used for installation. The pipes should be able to withstand the stresses and forces exerted during the driving process.

18. Fire Resistance:

In certain applications where fire resistance is a concern, such as industrial facilities or areas prone to wildfires, consider using SSAW steel pipes with appropriate fire-resistant coatings or materials.

19. Environmental Considerations:

Take into account any environmental factors that may affect the performance of the SSAW steel pipes, such as exposure to chemicals, temperature variations, or seismic activity.

20. Documentation and Traceability:

Maintain detailed documentation of the manufacturing process, materials used, testing results, and certifications for each batch of SSAW steel pipes. This ensures traceability and quality control throughout the project.

By incorporating these additional requirements into the selection, design, fabrication, and installation of SSAW steel pipes for onshore pipe pile applications, construction projects can ensure the structural integrity, durability, and safety of the pile foundation system.