Fire hydrants purchased or installed shall meet or exceed all applicable
requirements and tests of ANSI and the latest revision of AWWA Standard
C-502. Fire hydrants shall be rated for a working pressure of 250
psi. Hydrants shall be of a true compression type, opening against
pressure and closing with the pressure. The main valve seat shall
be 5 1/4 inches in diameter, and be reversible in design.
Hydrants shall be a three-way design, having one five-inch storz
pumper connection and two two-and-one-half-inch NST hose nozzles.
The storz connection and hose nozzles shall thread directly into the
barrel and be field-replaceable. The operating nut shall be a one-piece
design, 1 1/2 inch pentagon in size and shape. The direction
of opening shall be left (counterclockwise). The bonnet assembly shall
be provided with an oil reservoir and lubrication system that automatically
circulates lubricant to all stem threads and bearing surfaces each
time the hydrant is operated.
Hydrants shall be of the traffic-model design, provided with a stainless
steel, torque-diverting coupling and safety flange on the lower barrel.
Hydrants shall be equipped with two drain valves which drain the barrel
when the hydrant is closed. The bronze seat ring shall thread into
a bronze drain ring.
Hydrants shall be provided through an authorized Mueller distributor,
and the Water Department reserves the right to request certification
of the ten-year factory warranty. Hydrants shall be Mueller Super
Centurion 250-Model A-423.
The Water Department reserves the right to accept only those materials
which are in full compliance with these specifications and deemed
most advantageous to its interests.
The resilient wedge gate valves (three inches to twelve inches) shall
fully comply with the latest revision of AWWA C-509, and shall be
UL-Listed and FM-approved. The valves shall be tested and certified
to ANSI/NSF 61. The valve shall have a 250 psig working pressure and
shell tested to 500 psig.
The valve shall have a nonrising stem. The stem shall be of bronze
rolled stock and shall have a forged thrust collar. Cast stems are
not acceptable. The valve shall have an arrow cast on the operating
nut showing opening direction. The direction shall be open left (counterclockwise).
The NRS valves shall be provided with a two-inch square operating
nut. The bolt that attaches the operating nut to the stem shall be
recessed into the nut so as not to interfere with valve wrench operation.
The design of the NRS valve stem shall be such that if excessive input
torque is applied, stem failure shall occur above the stuffing box
at such a point as to enable the operation of the valve with a pipe
wrench.
The valve disc and guide lugs must be fully (100%) encapsulated in
rubber material. Guide caps of acetal bearing material shall be placed
over solid guide lugs to prevent abrasion and to reduce operating
torque. All valves shall have 304 stainless steel bolts and nuts for
stuffing box and bonnet. The valves shall have internal and external
ferrous surfaces coated with a fusion-bonded thermosetting powder
epoxy coating of 10 mils nominal thickness. The coating shall conform
to AWWA C-550. Gates valves and fire hydrants shall be of the same
manufacturer. Gate valves and tapping valves shall be Mueller A-2362
series.
The Water Department reserves the right to accept only those materials
which are in full compliance with these specifications and deemed
most advantageous to its interests.
The corporation valves shall be of the ball design in sizes from
3/4 to two inches. The corporation valves shall be tested and conform
to all applicable standards, including ANSI/AWWA C-800 and ANSI/NSF
61. All corporation valves shall have a bidirectional pressure rating
of 300 psi. All corporation valves shall have a full open round flowway
equal to the nominal pipe size of the valves smallest inlet or outlet.
The ball shall be coated with a FDA-approved PTFE coating.
All brass components in contact with potable water must be made from
either brass alloys C89520 or C89833, with a maximum lead content
of 0.25% by weight.
All corporation valves shall have stems with a dual o-ring seals
to insure leak tight operation and prevent infiltration. Valve stems
which are retained with wires, pins or nuts, are not acceptable. The
valves shall have an AWWA tapered thread (CC) inlet and a compression
inlet for copper tubing.
The curb valves shall be of the ball design in sizes from 3/4 inch
to two inches. The curb valves shall be tested and conform to all
applicable standards, including ANSI/AWWA C-800 and ANSI/NSF 61. All
curb valves shall have a bi-directional pressure rating of 300 psi.
All curb valves shall have a full open round flowway equal to the
nominal pipe size of the valves smallest inlet or outlet. The ball
shall be coated with a FDA-approved PTFE coating.
All brass components in contact with potable water must be made from
either brass alloys C89520 or C89833, with a maximum lead content
of 0.25% by weight.
All curb valves shall have stems with a dual o-ring seals to insure
leak tight operation and prevent infiltration. Valve stems which are
retained with wires, pins or nuts are not acceptable. The valves shall
have a compression inlet for copper tubing.