scope:

This model specification applies to plastic piping materials (e.g., pipes, tubing, and fittings) for open- and closed-loop, horizontal and vertical, direct-buried, and submerged water-based ground-source geothermal heat exchange systems, also known as "geothermal exchange," systems, "ground-coupled" systems, or "earth energy" systems. The outdoor piping in such systems may be referred to as the "geothermal ground loop", "ground heat exchanger", "ground loop heat pump piping", and other such derivations.

This model specification also applies to so-called indoor piping for geothermal exchange systems, such as that which connects buried ground loop piping to heat pump/s which are typically located within buildings.

This model specification does not apply to indoor piping for hot- and cold-water plumbing distribution or to hydronic heating and cooling system piping. Specifications for those piping products should follow local regulations.

Ground loop field size, depth and spacing, as well as grouting specifications, are not covered within this model specification and are the responsibility of the geothermal system designer.

Note 4: This specification does not apply to refrigerant-filled direct exchange systems.