PE can also be joined using

• A. Mechanical fittings
• B. Soldering
• C. Gluing with solvent cement
• D. Heat fusing

Answer: (D)

When joining polyethylene pipe used in propane systems, heat fusion is the preferred method because it creates a joint that is effectively part of the pipe itself. By heating the pipe ends to a molten state and then pressing them together, the material fuses into one continuous piece as it cools. This produces a joint with the same strength, flexibility, and pressure rating as the pipe, minimizing leaks and failure points.

Soldering is a technique for metals and wouldn’t provide a reliable bond with PE. Gluing with solvent cement is typical for PVC pipes, not PE, and wouldn’t meet gas-piping standards. Mechanical fittings can be used in some PE systems, but heat fusion offers a uniform, durable joint that is widely accepted and often required for propane piping.