1. Q: What is the difference between API 5L and ASTM A106 in terms of primary application focus?
A: API 5L is specifically for pipeline transportation systems in the petroleum and natural gas industries. ASTM A106 is for general high-temperature/pressure service in plants, power stations, and refineries.
2. Q: Name a standard for carbon steel pipe used in piling applications.
A: ASTM A252 covers welded and seamless steel pipe piles. Common grades are Grade 2 (50 ksi yield) and Grade 3 (55 ksi yield).
3. Q: What is a common seamless pipe grade for general fluid power (hydraulic/pneumatic) applications?
A: ASTM A106 Grade B or mechanical tubing per ASTM A519 (e.g., 1020, 1026).
4. Q: Which ASTM standard covers black and hot-dipped zinc-coated (galvanized) welded and seamless steel pipe for ordinary uses?
A: ASTM A53 is the main standard, covering both black and galvanized finishes (with galvanizing per specification A153).
5. Q: How are grades typically designated in the ASTM A500 standard for structural tubing?
A: By a letter: Grade A, Grade B, Grade C, and Grade D, with increasing minimum yield strength and different testing requirements for shapes (round, square, rectangular).
