Q: What welding methods are recommended for API 5L X65 seamless pipe?
A: Shielded metal arc welding (SMAW), gas metal arc welding (GMAW), or submerged arc welding (SAW) with low-hydrogen electrodes are recommended, following preheat and interpass temperature controls.
Q: What are the hardness limits for ASTM A335 P91?
A: Hardness should not exceed 250 HBW or 265 HV for ASTM A335 P91 to prevent cracking in high-temperature service.
Q: How is ASTM A179 seamless tube used in heat exchangers?
A: ASTM A179 (low-carbon steel) is used for heat exchanger and condenser tubes due to its good thermal conductivity and ability to be bent or expanded.
Q: What are the dimensional tolerances for API 5L X42 seamless pipe?
A: Dimensional tolerances per API 5L include outer diameter (±0.75%), wall thickness (+12.5%/-10%), and length as specified, typically ±0.5 inches.
Q: What non-destructive testing is required for ASTM A106 Gr. B?
A: ASTM A106 requires hydrostatic testing, and non-destructive testing like ultrasonic or eddy current may be specified for critical applications.
