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ENERGY STAR Homes Northwest
Geothermal Heat Pump Design and Installation Standards
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1.6.4 Specification of Polyethylene pipe will be by cell classification number. The
specification for PE pipe shall be as follows:
"Polyethylene pipe furnished under this specification shall be manufactured
in accordance with dimensional specifications of ASTM D-2513 or ASTM
F-714, as appropriate, using a resin having a cell classification of ######Z as
defined by ASTM D-3350. This resin shall exhibit not more than 20%
failures (F20%) when tested for 192 or more hours under ASTM D-1693,
Condition C.
1.6.5 The minimum cell classification number acceptable for polyethylene pipe is
PE3455434C or PE355434C when tested under ASTM D-3350.
1.6.6 The specification for PB pipe shall be as follows:
Polybutylene pipe furnished under this specification shall be manufactured in
accordance with ASTM Standard ASTM D-2581. The material shall be:
1.6.6.1 Either Class B (general purpose and dielectric, in colors) or Class C
(weather resistant, black in color containing not less than 2% carbon
black).
1.6.6.2. Type II (density, 0.91 to 0.92 g/cm).
1.6.6.3 Grade 1. (Low rate 0.25 to 0.75 g/10 min).
For fusible pipe, dimensional standards are given by ASTM D 2666 and
D3000.
1.7 Pipe Joining methods
1.7.1 The only acceptable method for joining buried pipe systems is by a heat
fusion process. No other method is acceptable.
1.7.2 For polyethylene pipe, butt fusion is recommended.
1.7.3 For polybutylene pipe, socket fusion is recommended.
1.8 Flushing, Purging, Pressure and Flow Testing
1.8.1 Vertical loops will be pressure tested before installation.
1.8.2 All horizontal components of the ground heat exchanger will be flushed,
pressure and flow tested prior to backfilling.
1.8.3 Heat exchangers will be tested hydrostatically at 150% of the pipe design
rating, or 300% of the system operating pressure if this value is the smaller of
the two.