Q: What is the weld seam inspection standard for API 5L X80 welded pipe? A: API 5L X80 welded pipe must undergo non-destructive testing (NDT), including ultrasonic testing (UT) for weld seam integrity, radiographic testing (RT) for internal defects, and pressure testing to ensure no leakage.
Q: What is the material of ASTM A333 Grade 3 welded pipe? A: ASTM A333 Grade 3 is a carbon steel welded pipe with a minimum yield strength of 276 MPa, designed for low-temperature service (minimum -101°C), suitable for cryogenic storage and transportation pipelines.
Q: Can GB/T 9711.2 Grade L360 welded pipe be used for high-pressure oil pipelines? A: Yes, GB/T 9711.2 Grade L360 (equivalent to API 5L X52) has a minimum yield strength of 360 MPa, which meets the requirements of high-pressure oil transmission pipelines (pressure ≥10 MPa).
Q: What is the maximum length of API 5L welded pipes? A: API 5L welded pipes are usually supplied in lengths of 6 meters, 12 meters, or 18 meters. Custom lengths can be produced according to customer requirements, but the maximum length is generally not more than 24 meters.
Q: What is the difference between hot-dip galvanized and electro-galvanized GB/T 3091 welded pipes? A: Hot-dip galvanized pipes have a thicker zinc coating (86-100 μm) and better corrosion resistance, suitable for outdoor and underground applications. Electro-galvanized pipes have a thinner coating (10-30 μm) and are used for indoor low-corrosion environments.
