SECTION 11317
SUBMERSIBLE DIRECT DRIVE AXIAL FLOW PUMPS - GENERAL
PART 1 GENERAL
1.1 SECTION INCLUDES
A. Mixed Liquor Recycle Pumps:
1. Mixed Liquor Recycle Pump No. 1: P-3-1-5.
2. Mixed Liquor Recycle Pump No. 2: P-3-2-5.
3. Mixed Liquor Recycle Pump No. 3: P-3-3-5.
B. Denitrified RAS Pumps:
1. Denitrified RAS Pump No. 1: P-3-8-5.
2. Denitrified RAS Pump No. 2: P-3-8-6.
C. Major components, including:
1. Pump and motor.
2. Mounting system.
3. Instrumentation and control.
1.2 SYSTEM DESCRIPTION
A. See Detail Pump Specifications at the end of this Section.
1.3 DESIGN REQUIREMENTS
A. See Detail Pump Specifications at the end of this Section.
1.4 SUBMITTALS
A. Shop Drawings: Submit under provisions of Division 1, including the following:
1. Complete assembly and installation drawings.
2. Descriptive information on material and equipment furnished.
3. Electric motor data.
4. Complete performance curves showing:
a. Capacity.
b. Head.
c. Efficiency.
d. Brake horsepower requirements.
e. Variable speed performance curves.
B. Submit operation and maintenance manuals under provisions of Division 1.
C. Submit certificates of proper installation and operator training under provisions of Division 1.
1.5 DELIVERY, STORAGE AND HANDLING
A. Deliver, store and handle the equipment under the provisions of Division 1.
PART 2 PRODUCTS
2.1 MANUFACTURER
A. Xylem Flygt, Pewaukee, WI.
B. Or approved equal. (See Schedule A in bid form for engineer’s designated alternate.)
2.2 GENERAL
A. All equipment shall be the end product of one system manufacturer. The manufacturer shall be responsible for the complete system including all items covered herein.
B. Pumps shall be integral-design, close-coupled, submersible type. The pump shall be capable of handling raw, fine-screened sewage. All components capable of continuous submerged operation to a depth of 130 feet.
2.3 METAL FABRICATION
A. Furnish metal parts described herein conforming to Section 05500.
B. Plates and Structural Members: Type 316 stainless steel.
C. Anchor bolts, bolts, nuts and washers: Type 316 stainless steel.
2.4 PUMP
A. Motors:
1. Motor nameplate horsepower: See Design Requirements in Detailed Specifications.
2. Type drive: Variable speed.
3. 460 VAC, three phase, 60 Hz.
4. Moisture resistant Class H insulation.
5. Continuous duty, 30 starts per hour.
6. Enclosure: Submersible.
7. Motor shall be inverter duty rated and meet NEMA MG1, Part 31.
8. The motor shall have NEMA B starting torque and low starting current. The motor shall not be overloaded beyond the nameplate rating under any normal conditions encountered.
9. The motor shall have temperature sensors embedded in motor windings.
10. The motor shall have moisture sensors located within the stator chamber.
B. Electrical Power and Signal Cable:
1. Type: Water proof.
2. Power cord entry to pump: Protected with a compression fitting followed by sealed terminal board with permanently affixed binding posts.
3. Length (each): Contractor shall coordinate power and signal cable length.
C. Pump Construction:
1. Pump case:
a. Pump motor housing: Gray cast iron ASTM A-48, Class 30 inner stator base with outer 316L stainless steel jacket.
b. Case seals: External mating parts machined and sealed with a double set of nitrile rubber O-rings.
c. Exposed fasteners: 316 series stainless steel.
2. Bearings: Roller and angular contact bearings with a rated minimum B10 life of 100,000 hours.
3. Shaft seals: Two sets of mechanical seals with tungsten carbide/tungsten carbide seal face rings for both the inner and outer seals.
4. Propeller:
a. Construction material: 316 stainless steel.
b. Type: Three-vane, dynamically balanced, non-clogging backswept design.
5. Pump connection to discharge pipe: 316 stainless steel.
6. Lifting and support cable: Stainless steel.
7. Mounting brackets: 316 stainless steel, minimum 2 required.
8. Sliding brackets: 316 stainless steel.
2.5 ACCESSORIES
A. Guide Bars:
1. Number of guide rails per pump: 2.
2. Construction: 2-inch Schedule 40 316 stainless steel.
3. Include all mounting hardware, including upper and lower guide brackets, and anchor bolts.
4. Include cable holder for pump electric cable.
5. Include non-sparking bushing on moving parts.
B. Discharge flange adapters:
1. Number of flange adapters per pump: 1.
2. Provide a flange adapter suitable for connection to discharge piping, as shown on drawings.
2.6 FINISHING
A. Shop and Field Painting: Conform to Section 09900, and the following requirements:
1. Verify compatibility of shop prime and field paint.
2. Finish all non-stainless steel and reinforced fiberglass surfaces with System No. 2, Submerged Metal – Sewage.
2.7 INSTRUMENTATION AND CONTROL
A. Pump Control Sensors:
1. Moisture Detectors: Provide in motor stator chamber.
a. Upon the moisture sensors sensing moisture in the stator chamber, the controls shall shut down the pump, indicate pump fail alarm, and activate the remote common fail.
2. Temperature Sensors: Provide thermal switches for each phase in pump motor.
a. Upon the temperature sensors sensing a high temperature in the motor stator, the controls shall shut down the pump, indicate pump fail alarm, and actuate the remote common fail. Automatically reset when temperature returns to normal.
3. Provide moisture and motor high temperature protection relay(s) to provide separate moisture and high temperature signals for each pump. Supervision relays shall be mounted in respective MCC.
a. Relay power supply to be 120 VAC.
PART 3 EXECUTION
3.1 INSTALLATION
A. In accordance with Drawings, shop drawings and manufacturer's instructions.
3.2 MANUFACTURER'S SERVICES
A. Provide manufacturer's services under the provisions of Division 1.
B. Minimum service requirements:
1. Installation: As required for proper installation.
2. Start-up and field testing: Four trips, one half day on site per trip.
3. Operator training: One half day on site.
C. Service to Repair Defective Work: Provide one-year warranty period under the provisions of General Conditions.
END OF SECTION
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