What type of copper tube is specified for use with Category 3 positive pressure gases?

The correct choice pertains to ASTM B819, which specifies the requirements for copper tubing suitable for use with Category 3 positive pressure gases. This type of tubing is designed to withstand the conditions typically associated with transporting fuels and gases under pressure, ensuring safety and reliability in various applications.

ASTM B819 copper tube is important for installations where the integrity of the gas transport system is crucial, as any failure could lead to significant safety hazards. The specifications within ASTM B819 outline the necessary material properties, dimensions, and performance characteristics that ensure the tubing can handle the pressure and type of gases involved.

Using the right specification is essential in construction and installation processes to comply with industry safety standards and minimize risks. The other choices refer to different ASTM standards that are not specifically intended for Category 3 positive pressure gases, which is why they are not appropriate for this application.