1. Available Methods are :
1. Seamless
2. Electric Welded
3. Longitudinal Seam submerged are welded (LSAW)
4. Helical seam submerged arc welded (HSAW)
2. Submarine Pipelines
1. Seamless Pipes upto and including 16”
2. LSAW Pipes 18” and above
3. Onshore Pipelines
1. Seamless pipes upto and including 8”
2. LSAW pipes 16” and above
3. HSAW Pipes 18” and above
4. EW Pipes : 4” to 18”