Which two methods are commonly used to join rigid lines?

• A. Welding and flanging
• B. Screwing and bolting
• C. Bending and welding
• D. Clamping and soldering

Answer: (A)

Welding and flanging are two widely recognized methods for joining rigid lines in fluid systems.

Welding creates a permanent joint by melting the materials at the point of contact, allowing them to fuse together as they cool. This method is particularly advantageous for applications requiring high strength and the ability to withstand extreme pressures and temperatures, making it suitable for various industrial applications, including pipelines and structural components.

Flanging involves joining two pieces of material by using flanges (raised edges) that are bolted together. This method allows for a more flexible assembly, as it can be disassembled without damaging the components. Flanging is ideal for situations where maintenance access is necessary or where connections may need to be made or broken frequently.

These two methods are favored for their reliability and strength in ensuring leak-free, robust connections in fluid handling systems.

In contrast, the other options present methods that may work for certain applications but are not as commonly employed for joining rigid lines specifically, particularly in high-pressure scenarios.