SECTION 11396 VERTICAL TURBINE MIXERS - DECHLORINATION CHAMBER

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


SECTION 11396 VERTICAL TURBINE MIXERS - DECHLORINATION CHAMBER


PART 1 GENERAL

1.1 WORK INCLUDED

A. Mixer: M-6-4-1.

B. Major components included with, but not limited to:
1. Motor.
2. Mechanical drive.
3. Propeller and shafts.
4. Spare parts and special tools.

1.2 SYSTEM DESCRIPTION

A. The mixer shall continuously mix the contents of the Dechlorination Chamber.

1.3 REFERENCES

A. ASTM A 36 - Structural steel.

B. ASTM A 48 - Gray iron castings.

C. AGMA Section 218.01 - Rating the pitting resistance and bending strength of spur and helical and involute gear teeth.

D. AGMA Section 390.03 - Single and double-reduction helical gearing speed reducers.

E. AFBMA Std: 9 - Load ratings and fatigue life for ball bearings.

F. AFBMA Std: 11 - Load ratings and fatigue life for roller bearings.

1.4 DESIGN REQUIREMENTS

A. Physical Conditions:
1. Tank Dimensions:
a. Length, ft: 10.0.
b. Width, ft: 10.0.
c. Side wall height, ft: 18.5.
d. Side water depth, ft: 13.0.
2. Tank volume, gal: 9,700.
3. Liquid level variation, ft: 3.0
4. Tank contents: Final effluent.

B. Mixing Requirements:
1. Mix sodium bisulfite solution with final effluent.

1.5 SUBMITTAL

A. Shop Drawings: Submit under provisions of Section 01300, including the following:
1. Complete assembly and installation drawings.
2. Descriptive information on material and equipment furnished.
3. Electric motor data.
4. Testing data and reports to show full compliance with specifications.

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. Philadelphia Mixing, Palmyra, PA, 3800 Series.

B. Lightnin, Rochester, NY, Model 73-Q-10.

C. Or Equal.

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.

2.3 METAL FABRICATION

A. Metal parts as described herein conforming to Section 05500.

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

2.4 EQUIPMENT

A. Motor:
1. Motor nameplate horsepower: 10 HP.
2. Type drive: Constant speed.
3. Nominal (synchronous) motor rpm: 1800 rpm.
4. Service factor: 1.15.
5. Enclosure: TEFC.
6. Power: 460 volt, 3 phase, 60 Hz.

7. 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.

B. Mechanical Drive:
1. Consisting of primary and final gear reduction units and conforming to the detailed requirements herein.
2. Primary reduction gearing: Helical gearing.
3. Final reduction gearing: Spiral bevel gearing.
4. Gearbox configuration: Right angle.
5. Service factor: 2.0 or greater.
6. Bearing life: Minimum L-10a of 100,000 hours.
7. Lubrication: Oil bath with oil dam.
8. Gear cases: Cast iron ASTM A48, Class 40B housings, enclosing all gears, sealed.
9. Bearings: Shall be anti-friction type ball, roller, or tapered roller bearings. Pressed-on type or sliding, journal type bearings are not acceptable.
10. All drives, lubrication and support equipment shall be readily accessible from the top of the drive.

C. Propellers and Shafts:
1. Construction: 316 stainless steel.
2. Propeller type: 43” Pitched Blade Turbine 4/45, adjustable 12” above nominal off bottom spacing.
3. Shaft:
a. Diameter, in: 3 or greater.
b. Length, in: 160, measured from base pad to center line of impeller agitator shaft.
c. Maximum output speed, rpm: 84.

D. Spare Parts and Special Tools:
1. Special tools: All special tools required for equipment, maintenance or disassembly.

2.5 FINISHING

A. Shop and Field Painting: Conform to Section 09900, System No. 6 except stainless steel. Verify compatibility of shop prime and field paint.

2.6 INSTRUMENTATION AND CONTROL.

A. Overload Temperature Sensor:
1. Motors to be provided with Klixon bimetal opening contact type overload temperature sensor in each phase winding.
2. Sensors shall open when motor temperature exceeds manufacture recommended operation temperature and shall automatically reset when motor temperature reaches safe operating temperature.
3. Sensors to be connected in series, with each sensor located in the hottest spot of the phase windings.

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.

3.2 MANUFACTURER'S SERVICES

A. Provide manufacturer's services under provisions of Section 01445.

B. Minimum Service Requirements:
1. Installation: As required for proper installation.
2. Start-up and field testing: One half 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