pressure meter, valved pressure taps, and bar stock needle valves. Venturi
flow nozzle shall have threaded bronze ends for pipe sizes up to 50 mm 2
inches and flanged ends for pipe sizes 65 mm 2-1/2 inches and above.
Venturi length shall not be less than 1.6 times the pipe size. Venturi
shall be selected to read differential pressure corresponding to 0.5 to 1.5
times the system flow rate. Venturi shall have an accuracy of plus or
minus 1 percent of the range. Meter shall have an accuracy of plus or
minus 2 percent of the full scale range.
2.8.5
Sight Flow Indicators
Sight flow indicators shall consist of a clear glass window or cylinder and
a nonferrous or 316 stainless steel body and impeller. Indicator shall
have threaded ends for pipe sizes up to 50 mm 2 inches and flanged ends for
pipe sizes 65 mm 2-1/2 inches and above. Maximum operating pressure shall
be no less than 862 kPa 125 psi. Maximum operating temperature shall be no
less than 121 degrees C 250 degrees F.
2.9
PAINTING AND FINISHING
Equipment and component items, when fabricated from ferrous metal and
located inside the building, shall be factory finished with the
manufacturer's standard finish.
PART 3
EXECUTION
3.1
INSTALLATION
3.1.1
Collector Subsystem
3.1.1.1
Collector Array
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NOTE: TM 5-804-2 discusses installation design
guidelines for solar collector arrays. The tilt
angle of the collectors off horizontal should be
near the site latitude within plus or minus 10
degrees. Items to be shown on the drawings with
regard to the installation of the array must include:
a. Tilt angle of collectors from horizontal
b. Elevation of bottom or back of collectors off of
flat or pitched roof
c. Location and elevation of piping with regard to
array supply and return.
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Solar collector array shall be installed at the tilt angle, orientation,
and elevation above roof as indicated. [For installation on flat roofs
with rack type collector mounting or for ground mounted collectors, bottom
of collector shall be a minimum of 450 mm 18 inches from roof or ground
surface.] [For mounting on pitched roofs, back of collectors shall be
installed a minimum of 50 mm 2 inches above roof surface.] Each solar
collector shall be removable for maintenance, repair, or replacement.
Solar collector array shall not impose additional loads on the structure
beyond the loads scheduled on the structural drawings.
SECTION 13600A
Page 23
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