What type of pipe connection should be used in a high-pressure, flammable, or corrosive service?

A. Threaded
B. Screwed
C. Bonded
D. Welded


A. Incorrect. If the pipe is used in low-pressure water service, a threaded joint might be appropriate because it is cheaper and easier to install.
B. Incorrect. Threaded (screwed) connections are typically used for low-pressure, nonflammable, and nontoxic service.
C. Incorrect. A bonded pipe can be welded, glued, soldered, or brazed.
D. Correct. If the pipe is to be used in high-pressure, flammable, or corrosive service, a welded joint would be a better option because it is less likely to leak than threaded joints.

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