SERIES 530 

SINGLE STAGE SUMP PUMPS 

 

 

1.0 GENERAL 

 

The contractor shall furnish (and install as shown on the plans) Aurora 
Model 531 Simplex centrifugal sump pump size 1.5x2x11 of ?(bronze 
fitted) (all bronze) (all iron) (stainless steel) construction. Each 
pump shall have a capacity of US gpm at ft total head, with a 
temperature of 60 °F, 1 specific gravity. The units shall be designed 
for a sump depth of ? feet and shall be furnished an ? (above the floor 
discharge terminating at the baseplate with a threaded connection) 
(below the floor discharge terminating with a threaded pipe 
connection). 

 

2.0 BASEPLATE 

A steel baseplate ?(oval) (round) (square) (simplex) (simplex with 
oval) (simplex with oval and manhole) (duplex with ovals and manhole) 
will be provided. 

 

2.1 CASING 

The pump casing and bearing cover shall be cast of iron. The casing is 
to be provided with ? wearing rings held securely in place by means of 
a press fit. 

 

2.2 STRAINER 

A strainer of sufficient size shall be bolted to the pump casing. 

 

2.3 IMPELLER 

The impeller is of the ?(enclosed) (semi-open) standard type and shall 
be constructed of (vacuum cast bronze) (cast iron). The impeller is to 
be dynamically balanced and keyed to the pump shaft. 

 

2.4 COLUMN PIPE 

The column pipe must be with a minimum diameter of ? " having machined 
tongue and groove joints to insure shaft alignment. 

 

2.5 BEARINGS/SLEEVE 

A pump bearing will be located directly above the impeller and shall be 
of the ?(bronze sleeve) (graphitar) (cutless rubber) (filled Teflon) 
(relief) type. Line bearings must be provided with a setting of 6'-2" 
and one bearing or each additional 5' of setting thereafter. All 
standard sleeves, throttle or relief pump and line bearings must be 
?(grease) (oil) (water) lubricated through separate Nylon tube 
lubrication lines terminating at the baseplate. 

 

2.6 MOTOR PEDESTAL 

The motor pedestal is to be of cast iron, two piece construction, 
fitted with a sealed thrust ball bearing located 6" above the 
baseplate. 

 

2.7 STUFFING BOX 

A packed stuffing box complete with lantern ring and split gland shall 
be provided for gas-tight construction. 

 

2.8 BEARING COLLAR/GREASE SEAL 


The ball bearing collar will be arranged to allow external axial 
adjustment of the shaft and impeller. Grease seals shall be provided 
to retain grease and to prevent contamination of the vertically mounted 
ball bearing. A grease fitting will be provided to allow regreasing of 
the bearing. 

 

2.9 FLOAT 

The pump shall be controlled by an enclosed (heavy duty) (water tight 
and explosion resisting) (heavy duty with built in overload protection) 
(explosion proof) type float operated switch 6" above the baseplate 
high density Polyethylene float and float rod. A flexible bellow will 
provide gas-tight construction. 

 

3.0 MOTOR 

The pumps are to be driven by and flexible coupled to a standard "HP" ? 
H.P., ? volt, 60 cycle, 1200 R.P.M., ? vertical electric motor. 

 

PART III - PERFORMANCE 

 

3.01 CONDITIONS OF SERVICE 

 

The following conditions of service shall be strictly adhered to: 

 

 Number of Units.................... ? 

 Type of Drive...................... ? (variable or constant) 

 Discharge Size, minimum............ 1.5 in 

 Suction Size, minimum.............. 2 in 

 Sphere Size, minimum............... ? in 

 Design Capacity.................... US gpm 

 Design Head........................ ft 

 Efficiency at Design, minimum...... %, 

 Rotative Speed, maximum............ 1150 RPM 

 Shut-off Head, minimum............. 53.9 ft 

 Driver Horsepower, minimum......... 2.1 hp 

 NPSHR at Design, maximum........... ft 

 Secondary Capacity................. ? US gpm (at maximum RPM) 

 Secondary Head..................... ? ft (at maximum RPM) 

 

3.02 INSPECTION AND FACTORY TESTS 

 

A. The Engineer shall have the right to inspect or witness test any 
material or equipment to be furnished, under this section, prior to 
their shipment from point of manufacture. The Engineer shall be 
notified at least ten (10) working days in advance of any testing in 
order to exercise or waive the right to witness any testing. 

 

B. Each centrifugal wastewater pump furnished under these 
specifications shall be tested at the factory in accordance with the 
latest edition of the Hydraulic Institute Standards for both 
hydrostatic pressure and performance. Certified copies of all test 
reports shall be submitted to the Engineer for approval prior to 
shipment. 

 

C. Each pump shall be tested at the full load speed of the respective 
driver for head, capacity, brake horsepower and efficiency from shut-
off to 150% of design capacity. In addition, for variable speed units, 
one (1) pump of each service shall be tested at the minimum design 


conditions plus three (3) equally spaced speeds between the minimum and 
maximum conditions. 

 

D. Tests on all motors shall be conducted in accordance with IEEE 
Standards. All test results shall be submitted to the Engineer for 
approval prior to shipment. 

 

1. Each motor shall be given a short commercial test which includes 
the following: 

 a. No load running current 

 b. High potential 

 c. Winding resistance 

 

3.03 INSTALLATION AND ACCEPTANCE TESTS 

 

A. The pumping units shall be installed in accordance with the 
instructions of the manufacturer and as shown on the drawings by the 
Contractor. 

 

B. Installation shall include furnishing the required oil and grease 
for initial operation. The grades of oil and grease shall be in 
accordance with the manufacturer's recommendations. 

 

C. Furnish the services of an authorized factory representative to 
inspect the final installation, perform initial start-up and supervise 
the field acceptance tests of the equipment. 

 

D. Field acceptance testing shall be conducted after the installation 
of all equipment has been completed and the equipment operated for an 
initial period to make all necessary adjustments and corrections. Each 
pumping unit shall be tested to determine satisfactory operation and 
compliance with these specifications in the presence of the Engineer or 
his representative. Testing shall be conducted for a sufficient time to 
demonstrate compliance and satisfactory operation. All expenses for 
conducting the field acceptance tests shall be borne by the Contractor. 

 

NOTES: Teflon is a registered trademark of E.I. DuPont. 

 

 Additional information is available from any Aurora Pump 
authorized distributor. 

 

 Aurora Pump reserves the right to make revisions to its products 
and their specifications without notice.