312 IAC 13-8-1
312 IAC 13-8-1 Geothermal heat pump wells
Cite as Ind. Admin. Code tit. 312, r. 13-8-1
Sec. 1. (a) This section establishes standards for drilling ground water heat pump systems that are in addition to the general requirements
for drilling a well under 312 IAC 12.
(b) If a return well is used with an open loop system, its design must provide water transmitting capacity that is at least one and one-half
(1 1/2) times the required water supply of the heat pump unit.
(c) With respect to a vertical closed loop system, boreholes must be pressure grouted from the bottom of the borehole to the ground surface
with a neat cement or high solids bentonite grout that, to enhance thermal conductivity, may contain any of the following:
(1) Sand.
(2) Graphite.
(3) Another material approved by the division.