SERIES 390 

MULTI-STAGE VERTICAL, IN-LINE CENTRIFUGAL PUMPS 

 

 

PART I - GENERAL 

 

1.01 DESCRIPTION 

 

 The Contractor shall furnish materials, equipment and labor to 
furnish, install and test the pumping system complete with the pumps, 
motors, mounting bases, piping, valves and appurtenances, as indicated 
on the contract drawings and as herein specified. 

 

1.02 INSTALLATION 

 

 The Contractor shall insure that the pumps and motors are 
properly installed with no pipe strain transmitted to the pump casing. 

 

1.03 RESPONSIBILITY 

 

 To assure a properly integrated and compatible system, all 
equipment described in this section shall be furnished by the Pump 
Manufacturer, who shall assume full responsibility for the proper 
operation of the pumps and associated equipment. 

 

1.04 SUPERVISION 

 

 The Contractor shall arrange for the Pump Manufacturer to 
provide a factory-trained representative as required for the purpose of 
supervising installation, start-up, final field acceptance testing, and 
providing instruction to the owner's operating personnel in the proper 
operation and maintenance of the equipment in this section. 

 

1.05 REFERENCE STANDARDS 

 

 The work in this section is subject to the requirements of 
applicable portions of the following standards: 

 

 Hydraulic Institute Standards 

 IEEE Standards 

 NEMA Standards 

 OSHA Rules and Regulations 

 

 

PART II - PRODUCTS 

 

2.01 GENERAL DESCRIPTION 

 

 The pump shall be a multi-stage vertical in-line centrifugal 
pump, Aurora Pump Model 394 or pre-approved equal. Pre-approval must 
be obtained a minimum of ten days before bid date. 

 

2.02 MATERIALS OF CONSTRUCTION 

 

 Upper Casing..................AISI 304 Stainless Steel Wetted & 
ASTM 48 Class 35 


 Lower Casing..................AISI 304 Stainless Steel Wetted 
with ASTM 48 Ductile Iron Flange Rings 

 Coupling......................Aluminum, Steel or Cast Iron 
(Horsepower Dependent) 

 

2.03 CASING 

 

 The lower casing will be of the in-line design with ANSI 250 lb. 
flanged suction inlet and discharge outlet. The upper casing shall 
have be machined to NEMA C-face motor register. The pump design shall 
allow for maintenance of pump internal components without disturbing 
the suction and discharge piping. 

 

2.04 IMPELLERS 

 

 The impellers shall be of the enclosed type, stamped stainless 
steel construction. 

 

2.05 STUFFING BOX 

 

 The stuffing box shall provide an adequate area for internal 
recirculation of the pumped fluid around the sealing medium. 

 

2.06 MECHANICAL SEAL 

 

 Shaft sealing shall be accomplished by means of a high 
temperature/high pressure mechanical seal with a Silicon Carbide seat, 
carbon washer, EPDM elastomers, and AISI 316 stainless steel metal 
parts. 

 

2.07 SHAFT 

 

 The pump shaft shall be rigidly coupled to the motor shaft. The 
shaft and impellers shall be grooved/formed to prevent rotation of the 
impeller relative to the shaft without the use of a separate key. 

 

2.08 SUCTION/DISCHARGE FLANGES 

 

 The lower casing shall be fitted with ANSI 250# suction & 
discharge flanges. Suction & discharge flanges shall be constructed of 
ductile iron and be of a slip ring design to allow for easy piping 
assembly. 

 MOTOR 

 

 The motor shall conform to the latest NEMA standards, and shall 
have the following characteristics: 

 

 Enclosure..................Open Drip Proof/TEFC 

 Number of Phases...........Single/Three 

 Cycles.....................60 Hz 

 Voltage....................115/208/230/460 volt 

 Speed......................3500 RPM 

 Horsepower.................? hp 

 

 Each motor shall have a sufficient horsepower rating to operate 
the pump at any point on the pump's head-capacity curve without 
overloading the nameplate horsepower rating of the motor regardless of 


service factor. The motor shall have a minimum service factor of 1.15. 
The service factor is reserved for variations in voltage and frequency. 

 

 

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.........................1.25 in, minimum 

 Suction Size...........................1.25 in, minimum 

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

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

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

 Rotative Speed.........................3500 RPM, maximum 

 Shut-off Head..........................459 ft, minimum 

 Driver Horsepower......................2.21 hp, minimum 

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

 

3.02 INSPECTION AND FACTORY TESTS 

 

 Each unit shall be hydrostatically tested after pump assembly. 

 

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. 

 

NOTES: 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.