1. What is API 5L?
API 5L is the standard for line pipe used in oil and gas pipelines, covering ERW, LSAW, and SSAW pipes.
2. What is the difference between API 5L PSL1 and PSL2?
PSL1: Basic requirements, lower inspection.
PSL2: Stricter chemical composition, mechanical properties, and non-destructive testing (NDT).
3. What is SSAW pipe used for?
SSAW (spiral welded pipe) is mainly used for:
Water supply and drainage
Oil and gas transmission
Piling for bridges, ports, and buildings
Large-diameter low-pressure pipelines
4. What is LSAW pipe?
LSAW = Longitudinal Submerged Arc Welding. It is made from single steel plates, used for large-diameter, high-pressure pipelines.
5. What standards are commonly used for welded pipes in China?
GB/T 3091: Welded steel pipes for water supply
GB/T 9711: Oil and gas transmission pipes
SY/T 5037: General-purpose spiral welded pipes
