2.3.4.4
Flow Control Balancing Valves
Copper alloy or cast iron body, copper alloy, or stainless internal working
parts, and integral pointer that indicates the degree of valve opening.
Valves shall be suitable for 862 kPa (gage) 125 psi at 87.8 degrees C 190
degrees F hot water. Valve shall function as a service valve when in fully
closed position. Valve body shall have factory-installed tappings for
differential pressure meter connections for verification of pressure
differential across valve orifice. Meter connections shall have positive
check valves or shutoff valves. Each valve shall have metal tag showing the
liters per second gallons per minute flow for each differential pressure
reading.
2.3.4.5
Backflow Prevention Assemblies
Provide reduced pressure principle type backflow prevention assemblies
which are approved by and have a current "Certificate of Approval" from the
FCCCHR List. Listing of the particular make, model/design, and size in the
current FCCCHR List will be acceptable as the required proof.
2.4
GROUND HEAT EXCHANGER PIPING SYSTEM
Provide polyethylene [or polybutylene] pipe and fittings for the
underground portions of the ground heat exchanger. Use of polyvinyl
chloride (PVC) pipe and fittings is not permitted.
2.4.1
Polyethylene Pipe
Pipe shall be manufactured from virgin high density polyethylene extrusion
material in accordance with ASTM D 2513 with PE345434C or PE355434C cell
classification and UV stabilizer of C, D, or E as specified in ASTM D 3350.
Provide ASTM D 3035 pipe with a standard dimension ratio (SDR) of 11.0 for
pipe less than 32 mm 1.25 inches diameter. Provide ASTM D 2447, Schedule
40 or ASTM D 3035 pipe with a minimum SDR of 13.5 for pipe 32 mm 1.25 inches
diameter or greater, and a minimum SDR of 17.0 for pipe 75 mm 3 inches
diameter or greater. Provide ASTM D 3035 pipe in vertical bores greater
than 60 m 200 feet deep with a SDR of 11.0.
**************************************************************************
NOTE: Polybutylene pipe is not available in the
Continental United States. This product is used in
Europe.
**************************************************************************
[2.4.2
Polybutylene Pipe
Pipe shall be manufactured from virgin polybutylene extrusion material in
accordance with ASTM D 2581, Type II, Grade 1, Class B or C. Provide ASTM
D 2666 pipe with a minimum SDR of 13.5 for pipe 50 mm 2 inches diameter or
less. Provide ASTM D 3000 pipe with a SDR of 11.0 for pipe greater than 50
mm 2 inches diameter. Provide ASTM D 3035 pipe in vertical bores greater
than 60 m 200 feet deep with a SDR of 11.0.
]2.4.3
Fittings
Provide ASTM D 3261 butt and saddle fusion fittings and ASTM D 2683socket
fusion fittings manufactured in accordance with ASTM D 2513. Barbed
fittings and hose clamps are not permitted in polyethylene [or
polybutylene] pipe systems.
SECTION 15741N
Page 24
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