Q: Which pipe grade/type is mandatory for sour service (H2S containing environments)?
A: Pipes meeting requirements for sour service, such as those with controlled hardness, sulfur content, and proven HIC (Hydrogen Induced Cracking) resistance. Standards like ISO 3183 or NACE MR0175/ISO 15156 provide guidelines.
Q: Why is galvanized welded pipe not recommended for some potable water systems?
A: Concerns over potential lead contamination from the zinc coating and zinc release into water. Alternative coatings or stainless steel (e.g., 304/316) are often used.
Q: What is a key factor in selecting ERW vs. CW (Cold Worked/Welded) pipe for mechanical applications?
A: Dimensional precision and surface finish. CW pipes offer tighter tolerances and smoother surfaces, suitable for applications like hydraulic cylinders.
Q: When would you specify an ASTM A333 grade for welded pipe?
A: For low-temperature service where impact toughness is critical. Grades like A333 Gr. 6 (-45°C) are common.
Q: What is a typical application for ASTM A513 Type 5 welded mechanical tubing?
A: It is electric resistance welded and then drawn to accurate dimensions. Common applications include automotive parts, machinery components, and furniture.
