AURORA MODELS 481-483-485 Section 910 Page 61

ENGINEERING SPECIFICATIONS Date April 2003

Supersedes Section 910 Page 61
CENTRIFUGAL FIRE PUMPS Dated June 1994

Furnish and install where shown on plans__________________ (A) AURORA MODEL 481 HORIZONTAL BASE MOUNTED size ____-481-
Aurora Fire Pump System(s) complete with pump, driver, controller and ____ horizontal split case, bronze fitted, SINGLE STAGE, double suction
accessories. The pumping unit shall be listed by Underwriters' Laboratories, centrifugal pump.
Inc. and/or shall be fully approved by the Associated Factory Mutual Fire
Insurance Companies, where applicable. The pumping unit shall meet all (B) AURORA MODEL 485 HORIZONTAL BASE MOUNTED size ____-485-
requirements of the National Fire Protection Association Pamphlet No.20. The ____ horizontal split case, bronze fitted, TWO STAGE, single suction,
Fire Pump shall be designed to deliver__________________G.P.M. centrifugal pump.
when operating at__________________PSIG. The pump shall also
deliver not less than 150% of rated capacity at a pressure not less than 65% The driver shall be a horizontal, foot mounted, open drip-proof (or T.E.F.C.),
of rated pressure. The shut off pressure shall not exceed 140% of rated ball bearing type, AC, induction, squirrel cage motor: wound for ____ volts,
pressure. Suction pressure is__________________PSIG. The pump 3 phase, 60 (50) Hertz. The motor shall be of such capacity that 115% of the
shall operate at a maximum synchronous speed full-load ampere rating shall not be exceeded at any condition of pump load.
of__________________ R.P.M. Locked rotor current shall not exceed the values specified in NFPA Pamphlet
No.20.
The Fire Pump shall be (one of the following):

Pentair Water
Section 910 Page 62 AURORA MODELS 481-483-485
Date April 2003 ENGINEERING SPECIFICATIONS
Supersedes Section 910 Page 62
Dated June 1994 CENTRIFUGAL FIRE PUMPS

Pump and motor shall be mounted on a common baseplate of steel (or All pumps where the suction pressure is expected to average 40 P .S.I. or
optional with drip rim). Pump and motor shall be checked for alignment after below, shall be provided with a lantern ring connected to the pressure side of
the pump base has been installed and grouted in place. the pump by a cored passage in the parting flange of the pump. Stuffing
boxes shall be equipped with split bronze packing glands designed for easy
C. AURORA MODEL 483 VERTICAL BASE MOUNTED size ____-483-____ removal for packing inspection and maintenance.
vertical splitcase, vertical mounted, bronze fitted, SINGLE STAGE double
suction, centrifugal pump. The fire pump unit shall include the following accessories, as required by
NFPA standards (depending on the conditions under which the pumps are to
The driver shall be a vertical, open drip-proof (or T.E.F.C.), ball bearing type, be installed).
AC, induction, squirrel cage "P" face motor: wound for ____ volts, 3 phase,
60 (50) Hertz. The motor shall be of such capacity that 115% of the full-load 1. Flow metering device _____
ampere rating shall not be exceeded at any condition of pump load.
Locked rotor current shall not exceed the values specified in NFPA Pamphlet 2. Eccentric tapered suction reducer _____
No.20.
3. Concentric tapered discharge increaser _____
The mounting feet of the pump shall be machined perpendicular to the shaft.
The pump shall be bolted to an extra heavy cast iron drip rim ring base. The 4. Discharge tee _____
top of the pump shall be machined to receive the motor mounting bracket.
The mounting bracket shall be machined with registered fits to align pump 5. Base elbow _____
and motor.
6. Hose valves _____
Casings shall be of cast iron having a minimum tensile strength of 35,000
P.S.I. Bearing housing supports, and suction and discharge flanges shall be 7. Caps and chains _____
integrally cast with the lower half of the casing. Removal of the upper half of
the casing must allow the rotating element to be removed without 8. Hose valve header _____
disconnecting the suction and discharge flanges.
9. Blind flange _____
Impellers shall be of the enclosed type and shall be of vacuum cast bronze.
Impellers shall be dynamically balanced, keyed to the shaft, and held in place 10. Pressure gauges X
_____
with threaded shaft sleeves.
11. Main relief valve (mandatory for engine drives) _____
The pump shaft shall be made of SAE 1045 Steel or equal, accurately
machined to give a true running rotating element. Shaft shall be protected by 12. Circulation relief valve X
_____
bronze sleeves which are key locked and threaded so that the sleeves
tighten with the rotation of the shaft. An o-ring shall seal between the 13. Relief cone - enclosed (mandatory for engine drives) _____
impeller hub and the shaft sleeve to protect the pump shaft.
14. Automatic air release valve X
_____
Pump shall be equipped with renewable bronze casing rings so designed that
hydraulic pressure will seat them against a shoulder in the pump case around 15. Splash shield (electric drive only) _____
the full periphery of the wearing ring. The wearing rings will be locked by
dowelling to prevent rotation. The rotating element uses heavy duty grease 16. Balldrip valve _____
lubricated ball bearings and shall be equipped with water slingers. Bearing
housings shall be so designed to flush lubricant through the bearing. 17. Coupling guard X
_____

Pentair Water
 AURORA MODELS 481-483-485 Section 910 Page 63
ENGINEERING SPECIFICATIONS Date April 2003
Supersedes Section 910 Page 63
CENTRIFUGAL FIRE PUMPS Dated October 1983

The Fire Pump motor control shall be U .L. Listed and/ or F.M. Approved, where than____degrees F.
applicable. It shall be completely assembled, wired and tested by the control The engine shall be of the self-contained open type mounted on a suitable
manufacturer before shipment from the factory, and shall be labeled "Fire Pump base with the following minimum accessories, plus any others that may be
Controller." The controller shall be located as close as practical and within sight of necessary by local requirements.
the motor. The controller shall be so located or protected that it will not be injured
by water escaping from the pump or connections. The controller shall be of the 1. Dual battery set sized to NFPA Pamphlet No.20 requirements with
combined manual and automatic, (across-the-line) (primary resistor) (partwind) electrolyte shipped in separate containers, rack and cables X
_____
(limited service) (wye delta) type, and shall be complete with:
2. Dual battery charger of proper type for batteries used (included in U.L.
1. Disconnect switch - externally operable, quick-break type. Listed/F.M. Approved controller) X
_____

2. Circuit breaker - time delay type with trips in all phases set for 300% of X
3. Electric starter with suitable generator and voltage regulator _____
the motor full-load current. The interrupting capacity of circuit breaker shall
be____asymmetrical amperes. 4. Engine water pump X
_____

3. Motor starter - across-the-line type capable of being energized 5. Heat exchanger cooling system X
_____
automatically through the pressure switch or manually by means of an
externally operable handle. 6. Water cooled or ceramic blanketed exhaust manifold X
_____

4. Pressure switch set to cut in at____p.s.i.g. and out at____p.s.i.g. 7. Lubricating oil pump and filter X
_____

5. Running period timer - set to keep motor in operation, when started 8. Speed governor X
_____
automatically, for a minimum period of one minute for each 10 HP motor
rating, but not to exceed 7 minutes. 9. Fuel injection system X
_____

6. Pilot lamp - to indicate circuit breaker closed and power available. 10. Air cleaner X
_____

7. Ammeter test link and voltmeter test studs. 11. Stubshaft X

_____

8. Alarm relay - to energize an audible or visible alarm through an 12. Fuel Pump X
_____
independent source of power to indicate circuit breaker open or power failure.
13. Engine Jacket Pre-heater X
_____
9. Manual selection station - a two position station shall be provided on the
enclosure marked " Automatic" and "Non-automatic." 14. Oil Emersion Heater X
_____

10. Means shall be provided on the Controller to operate an alarm signal 15. Proper instrument panel complete with engine run warning light, water
continuously while the pump is running. temperature gauge, oil pressure gauge, ammeter, totalizing type tachometer
and hour meter X
_____
Control equipment shall meet all requirements of NFPA No.20.
16. Commercial Grade Muffler X
_____
ENGINE DRIVE
17. Cooling water line for the engine heat exchanger assembly X
_____
The Fire Pump shall be driven by a U .L. Listed and F.M. Approved diesel
engine. The engine shall conform to the requirements of NFPA Pamphlet 18. Flexible exhaust connectors X
_____
No.20 and be approved for Fire Pump use. The rated speed shall not exceed
____RPM and shall develop ____ H.P. to drive the pump. Reserve H.P. All engine wiring for automatic operation shall terminate in a proper junction
shall be as stipulated in Pamphlet No.20 when the unit is operating box to permit field connection to a separate control panel.
at____ft. above sea level in an ambient temperature not greater

Pentair Water
Section 910 Page 64 AURORA MODELS 481-483-485
Date April 2003 ENGINEERING SPECIFICATIONS
Supersedes Section 910 Page 64
Dated October 1983 CENTRIFUGAL FIRE PUMPS
FUEL SYSTEM Starting the engine by a fire alarm relay, deluge valve relay, or remote push-
button station shall be included in the controller circuit.
A suitable fuel system for the diesel engine shall be furnished. It must be in
accordance with NFPA Pamphlet No.20, and shall include a____gallon In the event the pump, engine and control are in an unattended area, a
above surface storage tank. Flexible fuel connectors, combination vent-flash remote alarm panel shall be furnished as per NFPA Pamphlet No.20.
arrestor and fill cap shall be included.
TESTS
AUTOMATIC ENGINE CONTROL PANEL
The pump and electric motor (or engine) shall be thoroughly shop-tested by
The automatic engine control panel shall be approved for fire pump service the respective manufacturers as required by NFPA Pamphlet No.20. The
and shall meet the requirements of NFPA Pamphlet No. 20. The panel shall control panel shall also be tested as a unit. All such tests shall be conducted
be of the floor-mounted type, and enclosed in a moisture and dust tight prior to shipment.
housing. A combination manual and automatic type controller with "Manual-
Off-Automatic" selector switch shall be provided also, a 115 volt single phase The pump, driver, controller and all accessories shall be purchased under a
power failure relay or a pressure switch, which will (when the system drops unit contract. The pump shall be given a complete performance test with
to ____psig) activate all electrical circuits to automatically start the engine. POSITIVE SUCTION PRESSURE. A certified performance curve shall be
prepared and submitted. Pumps shall also be hydrostatically tested to twice
Should the engine fail to start after the required cranking cycles, the the shut off pressure, but in no case less than 250 lbs. per sq. inch.
controller shall disconnect the starting circuit and activate an alarm system
using lights and buzzer or bell. "Low oil pressure" and "high jacket-water In the case of diesel drives, the pump manufacturer shall perform a second
temperature" shall also be indicated by a suitable alarm system. The engine pump operational test as a unit with the job engine. Test data shall be
shall not shut down if either of these conditions occurs during an operating furnished.
cycle.
The pump manufacturer shall assume unit responsibility and shall provide the
The engine shall be started automatically by the controller at least once a services a factory trained representative to supervise and/or be available to
week and operate a minimum of 30 minutes. An appropriate timing conduct final field acceptance tests.
arrangement shall determine the day and hour of this test.

Pentair Water