2.2.2
Systems Supply
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NOTE: Supply shall include sufficient carbon
dioxide to meet requirements for the largest hazard,
calculated IAW NFPA 12, plus 91 kg 200 pounds for
hose reels (if provided), plus 100 percent reserve.
If the total requirement, including reserve, does
not exceed 908 kg 2000 pounds, use a high pressure
system. If the hose reels are located remote from
the other hazards, it may be more economical to
supply the hose reels from separate high pressure
storage near the hose station. Calculate size of
tank to determine the area required for its
installation. Final sizing of tank shall be done by
the Contractor's system calculations.
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Provide an approved low-pressure (2068 kPa (gage)300 psig) refrigerated
carbon dioxide storage tank, complete with full charge of carbon dioxide,
and necessary components and appurtenances. Calculate size of tank to
include sufficient carbon dioxide for the hazard requiring the largest
volume of carbon dioxide [plus 136 kg 300 pounds for hose reels], plus 100
percent reserve supply. In the event this calculated amount falls between
available sizes of tanks, provide next largest tank. Supply [underfloor]
[and] [room total] flooding systems [and] [local application systems] [and]
[hand hose reel stations] from this tank.
2.3
PIPE AND FITTINGS
2.3.1
Pipe
Hot-dipped galvanized, threaded end connections; Schedule 80 for continuous
pressure piping between storage tank and selector valves, [and between
selector valves and hand hose stations] and Schedule 40 for piping not
under continuous pressure.
a.
ASTM A 53, Type E (electric-resistance welded, Grades A or B) or
Type S (seamless, Grades A or B).
b.
ASTM A 106, Grades A or B.
2.3.2
Threaded Fittings
ASME B16.11, hot-dipped galvanized, for continuous pressure pipe fittings
between storage tank and selector valves, [and between selector valves and
hand hose stations] and ASME B16.3, Class 150, hot-dipped galvanized, for
pipe fittings not under continuous pressure.
2.4
PIPING ACCESSORIES
2.4.1
Escutcheon Plates
Provide one piece or split hinge type metal plates for piping passing
through floors, walls, and ceilings in exposed spaces. Provide polished
stainless steel plates or chromium-plated finish on copper alloy plates in
finished spaces. Provide paint finish on metal plates in unfinished
spaces. Securely anchor plates in place with setscrews or other approved
SECTION 13962N
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