Which specification covers seamless copper water tube?

• A. ASTM B 251
• B. NFPA 25
• C. ASTM B 88
• D. ASTM B 813

Answer: (C)

Seamless copper water tube for potable water distribution is defined by a standard that ensures the tube is manufactured without welds, with the right dimensions and wall thickness to handle residential water pressure and to be compatible with typical soldering/brazing connections. The standard that covers this application is ASTM B88, which specifies seamless copper water tube used in potable water systems, including the physical properties and tolerances needed for reliable sprinkler piping.

The other references don’t apply to seamless copper water tube for potable water in sprinkler systems: one is aimed at copper tubing for air conditioning and refrigeration, another is a maintenance standard for fire protection systems rather than a material specification, and the remaining standard covers copper tubing intended for different uses than potable water. Thus, ASTM B88 is the correct specification for seamless copper water tube in this context.