Types of oil and gas pipe

Types of oil and gas pipe
1. Seamless steel pipe: diameter range of Ø6mm ~ Ø660mm, common specifications below Ø406mm, Ø406mm above specifications require heat flaring rolling. Seamless steel pipe common defects are too large wall thickness deviation, poor surface quality, scale, folding and so on.
2. LSAW steel pipe: diameter range of Ø406mm ~ Ø1625mm, the minimum wall thickness is generally 6mm, and the quality is relatively good. LSAW pipe forming quality is better than spiral submerged arc welded pipe, pipe weld length for SSAW pipes of the same length is larger than the LSAW pipe length.
3. SSAW steel pipe: diameter range of Ø273mm ~ Ø1625mm, maximum wall thickness is usually 20mm, due to the molding process, there is a large residual stress in the spiral submerged arc welded pipe, and its quality is relatively lower than LSAW steel pipe.
4. ERW steel pipe: diameter range of Ø152mm ~ Ø660mm, maximum wall thickness is generally not more than 19mm, its quality is relatively lower than LSAW steel pipe, common defects are weld groove-like cracks, excessive burning, pins type weld, gray spot and so on. Due to the size limitations of seamless steel pipe and ERW steel pipe, LSAW and SSAW are adopted when the tube diameter is relatively large.