1. Q: What standard covers seamless pipe for refrigeration and heat exchanger service?
A: ASTM A333 covers low-temperature service, while ASTM Brome (specific for refrigerant lines) might also be used, but A333 Gr. 6 is common for ammonia systems.
2. Q: What is the difference between "Yield Strength" and "Tensile Strength" in pipe specifications?
A: Yield Strength (e.g., 240 MPa for API 5L B) is the stress at which permanent deformation begins. Tensile Strength (e.g., 415 MPa min for A106 Gr. B) is the maximum stress it can withstand while being stretched before breaking.
3. Q: Why is seamless pipe often used for "Jacketing" on insulated lines?
A: Its smooth, consistent surface and ability to be bent make it ideal for weatherproofing insulation, though welded pipe is also common for cost-saving on non-critical applications.
4. Q: What is "Hollow Bar" and how does it relate to seamless pipe?
A: Hollow bar is a thick-walled seamless mechanical tubing (like to ASTM A519) sold in random lengths, often used as feedstock for machining flanges, fittings, and sleeves, not for pressure piping per se.
5. Q: What is a critical consideration when bending seamless carbon steel pipe?
A: The minimum bend radius (typically 3-5 x OD) to avoid excessive thinning/flattening. Cold bending may require annealing afterward for severe bends or to restore properties for pressure service. The pipe's ductility (related to grade and heat treatment) is key.
