SECTION 11314 SCREW IMPELLER DRY PIT CENTRIFUGAL PUMPS-GENERAL

This spec was part of the Des Plaines, IL River WRF project tat bid Feb 26, 2015.

SECTION 11314 SCREW IMPELLER DRY PIT CENTRIFUGAL PUMPS-GENERAL


PART 1 GENERAL

1.1 SECTION INCLUDES

A. Screw Impeller Dry Pit Centrifugal Pumps:
1. Fermented Sludge Pumps:
a. Fermented Sludge Pump No. 1: P-7-17-1.
b. Fermented Sludge Pump No. 2: P-7-17-2.
2. Filtrate Return Pumps:
a. Filtrate Return Pump No. 1: P-7-18-1.
b. Filtrate Return Pump No. 2: P-7-18-2.

B. Major components included, but not limited to:
1. Pump and motor.
2. Mounting system.

1.2 SYSTEM DESCRIPTION

A. See Detailed Pump Specification at the end of this section.

1.3 REFERENCES

A. ASTM International:
1. ASTM A 48 - Gray Iron Castings.
2. ASTM A 108 - Steel Bars, Carbon, Cold-Finished, Standard Quality.

B. AISI C1141 - Steel Standard.

C. American Bearing Manufacturers Association (ABMA):
1. ABMA Std: 9 - Load Ratings and Fatigue Life for Ball Bearings.
2. ABMA Std: 11 - Load Ratings and Fatigue Life for Roller Bearings.

1.4 DESIGN REQUIREMENTS

A. See Detailed Pump Specifications at the end of this section.

1.5 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.

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.

1.6 DELIVERY, STORAGE AND HANDLING

A. Deliver, store and handle the equipment under the provisions of Division 1.


PART 2 PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. WEMCO, “Hidrostal”, Salt Lake City, UT.

B. Hayward Gordon, Buffalo, NY.

C. Or Equal.

2.2 GENERAL

A. All equipment shall be the end product of one pump system manufacturer. The manufacturer shall be responsible for the complete system including all items covered herein and in the Detailed Pump Specifications.

2.3 METAL FABRICATION

A. Furnish metal parts described herein conforming to Section 05500.

B. Anchor bolts, fasteners, nuts, and washers: 316 stainless steel.

2.4 EQUIPMENT

A. Motor:
1. Furnish motor compatible with the driven equipment herein. Motors shall be furnished as specified in Section 11338, and shall conform to the detailed requirements herein:
a. Motor nameplate horsepower: See Detailed Pump Specifications.
b. Type drive: Variable speed.
c. Nominal (synchronous) motor rpm: 1800 rpm.
d. Motor mounting: Horizontal.
e. Enclosure: TEFC.
f. Power: 460 volt, 3 phase, 60 Hz.
g. 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.

h. Motor shall be inverter duty rated and meet NEMA MG1, Part 31.
i. The motor shall have temperature sensors embedded in the windings.

B. Mechanical Drive:
1. Type: Direct drive, with flexible spacer coupling and OSHA approved guard.

C. Pump Construction:
1. Pump volute, back plate suction piece:
a. Construction: Close-grained cast iron ASTM A48 CL30.
b. Provide inspection port and drain in the volute casing of pumps with 5- inch suctions or larger.
c. Suction and discharge flanges: ANSI, 125 pound bolt circles.
2. Suction liner:
a. Construction material: 450 Brinell Hi-Chrome Iron ASTM A 532 CL III Type A.
b. Geometry: Conical with an internal spiral groove.
c. Provide as an independently replaceable part.
3. Impeller:
a. Construction material: Nodular iron or ductile iron.
b. Type: Combination positive displacement screw and single vane centrifugal with rear pump-out vanes.
c. Balancing: Dynamically and statically balanced.
d. Geometry: Conical.
e. Impeller clearance adjustment: External adjustment, which can advance retract and lock the position of the suction liner, with not more than three regulating screws.
4. Seals:
a. Type: Flushless, double mechanical seal, John Crane Type 21.
b. Lubrication: Oil bath.
c. Retainer, spring and driver band: Stainless steel.
d. Bellows: Buna-N.
5. Bearing housing:
a. Construction: Cast iron ASTM A48 CL30.
b. Type: Back, pull out design.
6. Shaft: Steel with a removable 420 stainless steel shaft sleeve in packing area.
7. Shaft bearings:
a. Pump side bearing-type: Radial single row roller bearing, AFBMA Std. 11.
b. Motor side bearing: Thrust double row ball bearings and a single row roller bearing, AFBMA 9 and AFBMA 11.
c. Lubrication: Grease.
d. Bearing life: B-10 life of 50,000 hours AFBMA 9 and AFBMA 11.

D. Pump Base:
1. Construction: Minimum 3/8-inch thick fabricated steel.
2. Provide common pump and motor mounting.
3. Provide grout holes.
4. Factory mount complete pumping unit including motor, and pump.

2.5 ACCESSORIES

A. Gauge Connections:
1. Provide 3/8-inch NPT tapped and plugged suction and discharge gauge connections on the pump nozzles or flanges.
2. When unable to install in pump, tap adjacent discharge and/or suction piping as shown on the Drawings.

2.6 FINISHING

A. Shop and Field Painting: Conform to Section 09900, System No. 5. Verify compatibility of shop prime and field paint.


PART 3 EXECUTION

3.1 INSTALLATION

A. In accordance with Drawings, shop drawings and manufacturer's instructions.

B. Level bases and grout with non-shrinking grout.

C. Align pump and drive.

D. Eliminate any strain from piping.

3.2 MANUFACTURER'S SERVICES

A. Provide manufacturer's services under provisions of Division 1.

B. Minimum Service Requirements:
1. Installation: As required for proper installation.
2. Start-up and field testing: One day on site.
3. Operator training: One half day on site.

C. Service to Repair Defective Work: Provide during one-year warranty period under the provisions of General Conditions.


END OF SECTION