Which statement is correct regarding the materials allowed for piping between the vacuum pump and the source shutoff valve?

Which statement is correct regarding the materials allowed for piping between the vacuum pump and the source shutoff valve?

• A. Brass pipe
• B. Galvanized steel pipe
• C. Black steel pipe
• D. All of the above

Answer: (D)

The key idea is that the piping segment from the vacuum pump to the source shutoff valve just needs to be a reliable, leak-tight path that can handle vacuum and resist the environment. Brass, galvanized steel, and black steel all meet those requirements when installed properly and in accordance with relevant codes and standards. Brass is corrosion-resistant and seals well, galvanized steel is strong and commonly used for piping with approved fittings, and black steel is robust for gas-service use. With correct fabrication, threading or welding, and leak testing, any of these metals can be used for that portion of the vacuum system. That’s why all listed options are acceptable.

The key idea is that the piping segment from the vacuum pump to the source shutoff valve just needs to be a reliable, leak-tight path that can handle vacuum and resist the environment. Brass, galvanized steel, and black steel all meet those requirements when installed properly and in accordance with relevant codes and standards. Brass is corrosion-resistant and seals well, galvanized steel is strong and commonly used for piping with approved fittings, and black steel is robust for gas-service use. With correct fabrication, threading or welding, and leak testing, any of these metals can be used for that portion of the vacuum system. That’s why all listed options are acceptable.