What is the connection method for underground HDPE materials in GSHP systems?

In ground source heat pump (GSHP) systems, the connection method for underground high-density polyethylene (HDPE) materials is through fusion welding. This method involves heating the ends of the HDPE pipes until they melt and then fusing them together as they cool, creating a strong and leak-proof joint.

Fusion welding is particularly advantageous for HDPE due to the material's properties; it provides a seamless connection that maintains the integrity and flexibility of the pipes, which is critical in underground installations where movements due to soil shift or thermal expansion and contraction are common.

Mechanical compression fittings, while used in other piping systems, do not provide the same level of durability and leak-proof capabilities for HDPE in the underground setting. Soldering is not applicable as it is a method primarily used for metal pipes, and threaded connections can compromise the integrity of the connection in underground applications due to soil movement and pressure. Thus, fusion welding is the most reliable and effective method for connecting HDPE materials in GSHP systems.