Illinois Plumbing Code Practice

Every joint in plastic piping shall be made with approved fittings by either:

1. solvent-welded or fusion-welded connections

2. compression fittings

3. approved insert fittings

4. metal clamps and screws of corrosion-resistant material

The correct answer is: metal clamps and screws of corrosion-resistant material

The correct practice for joining plastic piping within the Illinois Plumbing Code specifies the use of approved fittings, particularly through methods that ensure a strong and watertight connection. Solvent-welded or fusion-welded connections are widely accepted for this purpose, as they create a unified bond that retains the integrity of the pipe system. When dealing with connections in plastic piping, it’s essential to use methods designed for the specific type of plastic being utilized. Solvent welding involves using a chemical that softens the plastic surfaces, allowing them to fuse together once the solvent evaporates. Fusion welding uses heat to melt the joints, resulting in a solid connection once cooled. While compression fittings and approved insert fittings can be valid for certain applications, they do not provide the same level of structural integrity as solvent or fusion welding for plastic pipes. Compression fittings rely on mechanical pressure to hold joints together and may not perform as reliably in all situations. Using metal clamps and screws, while potentially applicable in some other contexts, does not meet the standards for plastic piping connections. These fasteners can lead to potential leaks and do not form the consistent seal required for plastic systems, thereby jeopardizing the integrity of the plumbing system. Therefore, the best methods for making joints in plastic piping within