2.5
[BOOSTER] [AND] [CIRCULATING] PUMPS
**************************************************************************
NOTE: If silicone based fluids are used, rotary
pumps should be used to avoid seepage problems.
**************************************************************************
[FS A-A-50560, in-line centrifugal] [FS A-A-50562 non-self-priming,
horizontally mounted, centrifugal] [FS A-A-50561, rotary] [; pump styles as
indicated]. Provide flanged inlets and outlets, mechanical seals, flexible
couplings, and electric motors. Select pumps to operate not more than 5
percent below and on the shut-off side of the maximum efficiency point of
the impeller curve. Provide bronze or cast iron body construction, bronze
or stainless steel fitted.
2.6
COMPRESSION TANKS
ASME BPVC SEC VIII, steel construction with ASME label for 862 kPa (gage)
125 psig working pressure. Hot-dip galvanize interior and exterior
surfaces of tanks after fabrication. Provide cast iron or steel saddles or
supports. Provide tanks with drain, fill, air charging and system
connections, and liquid level gage.
2.7
SOLAR STORAGE TANKS
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NOTE: Small mixing pumps and shrouds to enhance
tube bundle heat exchanger performance in the tanks
are an exception and should be used only where
required. The corrosive nature of some water
supplies may require copper lining. For better
stratification (hot water on the top, cold water on
the bottom), vertical solar tanks should be used. Up
to 18,950 liters 5,000 gallon capacity, solar
storage tanks may be unpressurized, internally
stainless-steel-lined, factory insulated, and
covered with enamel steel outer jackets for indoor
applications or fiberglass jackets for outer and
underground applications. Solar storage tanks, if
intended for an usable life in excess of 5 years,
should not be pressurized. Unpressurized stainless
steel tanks should last in excess of 20 years; other
unpressurized tanks should last up to 15 years;
pressurized steel tanks with copper heat exchangers
may last only 3 to 8 years, due to galvanic
corrosion. Recommend 122 liters 3 gallons of
storage capacity for each square meter foot of
collector surface facing the sun.
**************************************************************************
Except as modified herein, FS F-T-2907; [stone lined (cement lined)] [glass
lined] [stainless steel] [Type 18-8 stainless steel lined] [or] [baked-on
phenolic] steel tank with ASME label for [862 kPa (gage)] [125 psig]
[_____]. Do not use baffles or perforated pipes in tank construction. For
the steel tank, include [collector loop heat-exchanger bundle] [and]
[domestic hot water] [and] [space heating] heat-exchanger bundle.
SECTION 13610N
Page 14
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