ADDENDUM NO. 2 CITY OF SAN ANTONIO CAPITAL ...

HVAC Upgrades – International Center AAI #12-154
2.3 VORTEX SEPERATOR/PUMP SYSTEM
A. Manufacturers:
1. Lakos
2. Puroflux
3. Substitutions: As approved by Engineer prior to bid date. .
B. Supply a packaged separator system with pump, completely factory assembled. The
packaged system shall include a centrifugal vortex type separator, integral pump and
schedule 80 PVC interconnecting piping. The complete system shall be mounted on an
epoxy coated steel skid.
C. The separator shall be a dumbbell type design with a true tangential entry to ensure
proper helical flow. The separator shall have an expected solids performance rating of
98% efficient at 74 microns and larger (with a specific gravity of 2.6 or greater) on a
single pass. The unit shall be equipped with inlet/outlet gauges to monitor pressure drop
and a manual air relief valve shall be provided at the top of the vessel.
D. The separator shall be fabricated of carbon steel, rated at 150 psi working pressure
(temperature dependent). The separator vessel shall be hydro tested at 1.5 times the
design pressure and finished with a fusion bonded epoxy coating.
E. The system pump shall be a cast iron bronze fitted close couple, end suction type, sized
for the proper flow rate of the package. The pump shall be of cast iron construction and
include a cast iron pre-strainer with a perforated stainless steel basket. The pump shall be
provided with a standard efficiency TEFC motor.
F. Purging of the accumulation chamber shall be accomplished without interrupting flow or
excessive loss of system fluid.
1. The separator shall be equipped with automatic controls consisting of an
electrically actuated two-way brass ball valve with a HOA switch and solid state
purge timer mounted in the control panel.
G. The separator shall be equipped with automatic controls consisting of a motor start/stop
device with overload short circuit protection, pump HOA selector switch, mounted in a
NEMA 4X fiberglass enclosure. The unit shall have have a single point electrical
connection.
PART 3 EXECUTION
3.1 INSTALLATION
A. Provide pumps to operate at specified system fluid temperatures without vapor binding
and cavitation, are non-overloading in parallel or individual operation, and operate within
25 percent of midpoint of published maximum efficiency curve.
B. Install long radius reducing elbows or reducers between pump and piping. Support piping
adjacent to pump so no weight is carried on pump casings.
C. Install pumps on vibration isolators. Refer to Section 23 05 48.
HYDRONIC PUMPS 23 21 23 - 4