Conn. Agencies Regs. § 25-128-39c - Closed-loop geothermal system piping
(a) The only
acceptable materials for the underground portion of a closed-loop geothermal
system are as follows:
(1) Copper, that has a
cathodic protection system;
(2)
High density, polyethylene extrusion compound having a cell classification of
PE 345434c or PE 355434c with an ultraviolet stabilizer of C, D or E as
specified in American Society for Testing and Materials ("ASTM") standard
D-3350 with the following exception: This material shall exhibit zero (0)
failures when tested for one hundred ninety-two (192) hours or more under ASTM
standard D-1693, condition C, as required in ASTM standard D-3350. This
material shall maintain a one hundred sixty (160) pounds per square inch
("psi") hydrostatic design basis at 73.4 degrees Fahrenheit per ASTM standard
D-2837, and shall be listed in PPI TR4 as a PE 3408 piping formulation;
and
(3) Those materials approved by
the department in consultation with the Department of Public Health and the
Department of Energy and Environmental Protection.
(b) The only acceptable methods for joining
sections of buried geothermal piping are as follows:
(1) For copper piping assemblies, by the use
of brazed joints;
(2) For
polyethylene piping assemblies, by use of the heat fusion process in accordance
with the pipe manufacturer's specifications, or by use of mechanical stab
fittings approved by the International Ground Source Heat Pump Association
("IGSHPA"; and
(3) For piping made
of materials approved pursuant to subsection (a)(3) of this section, by the use
of those methods approved by the department in consultation with the Department
of Public Health and the Department of Energy and Environmental
Protection.
(c) All
geothermal systems shall be pressure tested with water, air, or an inert gas to
a minimum of one hundred fifty (150) per cent above the heat pump
manufacturer's operating specifications for a minimum period of thirty (30)
minutes before being put into service. Any system found to leak shall be
repaired or replaced and then retested before being put into service.
Notes
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