A252 GRADE 2 Steel Pipe For Underground Gas Pipelines
When it comes to underground gas pipe installation, one of the most critical aspects is the choice of welding method to connect the pipes. Helical Submerged Arc Welding (HSAW) is a popular welding technique used to join A252 Grade 2 steel pipe in underground gas pipe installations. This method offers several advantages, including high welding efficiency, excellent structural integrity, and long-term reliability.
A252 Grade 2 steel pipe is specifically designed for use in pressure applications such as transporting natural gas. These pipes are known for their high tensile strength and corrosion resistance, making them ideal for underground gas pipeline installations. However, the welding process is critical to ensuring the overall integrity and longevity of natural gas pipelines.
Mechanical Property
| Grade 1 | Grade 2 | Grade 3 | |
| Yield Point or yield strength, min, Mpa(PSI) | 205(30 000) | 240(35 000) | 310(45 000) |
| Tensile strength, min, Mpa(PSI) | 345(50 000) | 415(60 000) | 455(66 0000) |
Product Analysis
The steel shall contain no more than 0.050% phosphorous.
Permissible Variations In Weights And Dimensions
Each length of pipe pile shall be weighed separately and its weight shall not vary more than 15% over or 5% under its theoretical weight, calculated using its length and its weight per unit length
The outside diameter shall not vary more than ±1% from the specified nominal outside diameter
Wall thickness at any point shall not more than 12.5% under the specified wall thickness
Length
Single random lengths: 16 to 25ft(4.88 to 7.62m)
Double random lengths: over 25ft to 35ft(7.62 to 10.67m)
Uniform lengths: permissible variation ±1in
One of the main advantages of spiral submerged arc welding is its high welding efficiency. This method enables high deposition rates, resulting in faster welding and increased productivity. As a result, installation of underground gas pipes can be completed in a more timely manner, minimizing disruption and downtime.
Additionally, HSAW has excellent structural integrity. The welding process creates a strong and continuous bond between A252 Grade 2 steel pipes, ensuring the pipes can withstand the external pressures and environmental conditions common in underground environments. This structural integrity is critical to safely and reliably transporting natural gas over long distances.
In addition to efficiency and structural integrity, spiral submerged arc welding provides long-term reliability. Welded joints formed using this technology offer exceptional durability and corrosion resistance, ensuring underground gas pipes remain in optimal condition over the long term. This longevity is critical to minimizing the maintenance and repair costs associated with natural gas pipelines.
Overall, the choice of welding method for joining A252 Grade 2 steel pipes in underground gas piping installations plays a vital role in the overall safety and effectiveness of the gas distribution system. Spiral submerged arc welding offers significant advantages in welding efficiency, structural integrity and long-term reliability, making it ideal for ensuring the integrity of underground gas pipelines.
In summary, the importance of A252 Grade 2 steel pipe spiral submerged arc welding in underground gas pipeline installations cannot be underestimated. This welding method offers many advantages, including high welding efficiency, excellent structural integrity, and long-term reliability. By choosing HSAW welded A252 Grade 2 steel pipe, gas pipeline installers can ensure safe and reliable natural gas transportation for years to come.
