Red Seal Gasfitter — Class A Practice Exam

Which type of fittings are typically used in gas piping systems?

1. Insulated fittings

2. Threaded, welded, or flanged fittings

3. Plastic fittings

4. Soldered fittings

The correct answer is: Threaded, welded, or flanged fittings

In gas piping systems, the fittings that are primarily used are threaded, welded, or flanged fittings. These types of fittings are specifically designed to ensure leak-proof connections and can withstand the pressures involved in gas distribution. Threaded fittings are common in metallic pipe systems as they provide a strong joint and allow for easy disassembly if needed. Welded fittings create a permanent bond between pipes, offering high strength and reliability, which is essential in gas applications where leakage poses serious safety risks. Flanged fittings provide a secure and accessible connection point between sections of piping, facilitating maintenance and repairs. The other options do not generally fit the requirements for gas piping systems. Insulated fittings, while important in other contexts, are not standard for gas piping where the focus is on pressure integrity and safety. Plastic fittings, although used in specific low-pressure applications, are not suitable for gas due to their potential to degrade and fail under high temperatures and pressures associated with gas systems. Soldered fittings, often used in plumbing systems, are also not appropriate for gas applications due to their reliance on a melting point that may not withstand the demands of a gas system. Thus, the use of threaded, welded, or flanged fittings is essential to maintain the integrity and safety of