Or. Admin. R. 690-240-0043 - Construction Standards
(1) If
permanent casing is needed in a ground source heat pump boring, it shall meet
the standards set out in OAR 690-210-0190 through 690-210-0220 for steel and
plastic.
(2) Site specific
conditions shall be assessed to determine the best method and materials to be
used for sealing the boring annulus to protect the groundwater resource and
that method shall meet the standards set out in OAR 690-210-0300 through
690-210-0360 for sealing wells.
(3) The diameter of the borehole for cased
and uncased ground source heat pump borings shall allow placement of the heat
exchange loop and grout pipe to the bottom of the boring as follows:
(a) For installation of a 3/4 inch loop, the
diameter of the borehole shall be a minimum of 4 inches;
(b) For installation of a 1 inch loop, the
diameter of the borehole shall be a minimum of 4 1/2 inches; and
(c) For installation of a 1 1/4 inch loop,
the diameter of the borehole shall be a minimum of 5 inches.
(4) The type of sealing material
used shall be compatible with the heat exchange loop material and permanent
casing material used in the construction of the boring.
Notes
Stat. Auth.: ORS 536.027, 537.780
Stats. Implemented:
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