What ASTM standard is used for piping, pipe fitting, and tubing of a low-pressure storage tank?

The ASTM standard used for piping, pipe fittings, and tubing in low-pressure storage tanks is ASTM A333. This standard specifies the requirements for seamless and welded steel pipe for low-temperature service, ensuring that the materials can withstand conditions typically associated with low-pressure applications.

ASTM A333 includes specifications for various grades of carbon and alloy steel pipe, which are suitable for use in temperatures down to -50°F, making it ideal for environments where low temperatures are a factor. This standard ensures that the materials provide adequate strength, ductility, and impact resistance, which are crucial for maintaining the integrity and safety of storage tanks under low-pressure conditions.

The other choices pertain to different applications: ASTM A123 is related to zinc (hot-dip galvanized) coatings on iron and steel products; ASTM A500 covers cold-formed welded and seamless carbon steel structural tubing; and ASTM A537 pertains to pressure vessel plates for moderate and low-temperature service, but not specifically for piping. This distinction underscores why ASTM A333 is the appropriate choice for piping in low-pressure storage tank applications.