WITHIN BUILDINGS.
][2.2.3
Converters
Steam to hot water converters shall conform to FS WW-H-191 and shall have
capacity as indicated for the design conditions. The converters shall be
designed for support by separate pipe hangers, and [temperature regulator]
[vent valve] shall be provided.
]2.3
PIPING SYSTEM EQUIPMENT
2.3.1
Pumps
Provide hot water circulating pumps, FS A-A-50560, Service A. Pump casing
and flange shall be made of close-grained cast iron. Shaft shall be carbon
or alloy steel with lubricated bearings and impeller shall be bronze.
Select pumps so that the operating point on selected impeller-curve will
lie at or to the left of shutoff side of, and not more than 5 percent
below, point of maximum efficiency for impeller. Provide motors of [open]
[splash proof] [totally enclosed] type conforming to NEMA MG 1 and suitable
for electrical characteristic as indicated. Motor starters shall conform
to NEMA ICS 2 [manual] [across the line] [reduced-voltage-start]
[part-wind] [wye-delta] type with NEMA ICS 6[general purpose]
[weather-resistant] [watertight] enclosure.
2.3.2
Provide welded steel, constructed and tested hydrostatically in accordance
with ASME BPVC SEC VIII D1. Tank shall be equipped with all necessary
fittings. The tank and fittings shall be pressure rated at least equal to
the test pressure of the total system. Zinc coat the tank inside and out
after fabrication by the hot dip process ASTM A 123/A 123M.
2.3.3
External Air Separation Tanks
Provide tank constructed of steel, designed for not less than 517 kPa (gage)
75 psig, and constructed and tested in accordance with the requirements of
ASME BPVC SEC VIII D1. Provide tangential inlet and outlet connections,
flanged for sizes 65 mm 2 1/2 inches and larger. Each unit shall have an
internal design suitable for creating the required vortex and subsequent
air separation. Provide with automatic air release device and galvanized
steel strainer. Provide a blow down connection with a gate valve and piped
to nearest floor drain.
2.3.4
Backflow Preventers
**************************************************************************
NOTE: If contract specifications includes Section
15400, "Plumbing Systems" in which backflow
preventers are specified, delete this paragraph
entitled "Backflow Preventers."
**************************************************************************
Reduced pressure principle type. Furnish proof that each make,
model/design, and size of backflow preventer being furnished for the
project is approved by and has a current "Certificate of Approval" from the
[FCCCHR List] [or] [local code]. Listing of a particular make,
model/design, and size in the current [FCCCHR List] [or] [local code] will
be acceptable as the required proof.
SECTION 15185N
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