shall be cold-sprung and installed where indicated. Pipe guides shall be
provided as indicated. Expansion joints shall not be used in system piping.
3.1.3.6
Valves
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NOTE: Calibrated balancing valves are required at
the outlet of each bank in addition to the ball
valve required at this outlet. If the
reverse-return piping strategy is properly adhered
to, this valve may prove unnecessary. It is
specified, however, to allow the array to be flow
balanced in the event of improper construction or
modification of the array at some later time. The
ball valves are required to enable the array to be
disconnected for maintenance or repair. Check
valves at pump discharges are required to prevent
back flow into pumps and are required on the
collector loop to prevent fluid cooled in the
collectors at night from migrating around the loop
to the heat exchanger.
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Valves shall be installed at the locations indicated and where required for
the proper functioning of the system. Valves shall be installed with their
stems horizontal or above. Gate or ball valves shall be installed at the
inlet and outlet of each bank of internally manifolded collectors.
Calibrated balancing valves with integral pressure taps shall be installed
at the outlet of each bank and at the pump discharge. Final setting for
each valve shall be marked on each valve. Ball valves shall be installed
with a union immediately adjacent. Gate valves shall be installed at the
inlet and outlet of each pump and also at the inlet and outlet of each heat
exchanger. A check valve shall be installed at pump discharges.
Discharges of relief valves shall be piped to the nearest floor drain or as
indicated on system drawings.
3.1.3.7
Foundations
Concrete foundations or pads for storage tanks, heat exchangers, pumps, and
other equipment covered by this specification shall be constructed in
accordance with manufacturer's recommendations and be a minimum of 150 mm 6
inches high with chamfered edges.
3.1.3.8
Grooved Mechanical Joints
Grooves shall be prepared according to the coupling manufacturer's
instructions. Grooved fittings, couplings, and grooving tools shall be the
products of the same manufacturer. Pipe and groove dimensions shall comply
with the tolerances specified by the coupling manufacturer. The diameter
of grooves made in the field shall be measured using a "go/no-go" gauge,
vernier or dial caliper, narrow-land micrometer, or other method
specifically approved by the coupling manufacturer for the intended
application. Grooved width and dimension of groove from end of pipe shall
be measured and recorded for each change in grooving tool setup to verify
compliance with the coupling manufacturer's tolerances. Grooved joints
shall not be used in concealed locations.
SECTION 13600A
Page 27
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