section 061600 – sheathing · 2015-05-05 · materials are installed in sequence and manner that...

4056 SHEATHING 061600 - 1Addendum No. 5– Dated 5/4/2015

SECTION 061600 – SHEATHING

PART 1 - GENERAL

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Condi-tions and Division 01 Specification Sections, apply to this Section.

1.2 SUMMARY

A. Section Includes:

1. Roof sheathing.

B. Related Requirements:

1. 061000 "Rough Carpentry" for plywood backing panels.

1.3 ACTION SUBMITTALS

A. Product Data: For each type of process and factory-fabricated product. Indicate component ma-terials and dimensions and include construction and application details.

1. Include data for wood-preservative treatment from chemical treatment manufacturer andcertification by treating plant that treated plywood complies with requirements. Indicatetype of preservative used and net amount of preservative retained.

2. For products receiving a waterborne treatment, include statement that moisture content oftreated materials was reduced to levels specified before shipment to Project site.

3. Include copies of warranties from chemical treatment manufacturers for each type oftreatment.

1.4 INFORMATIONAL SUBMITTALS

A. Evaluation Reports: For following products, from ICC-ES:

1. Preservative-treated plywood.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Stack panels flat with spacers beneath and between each bundle to provide air circulation. Pro-tect sheathing from weather by covering with waterproof sheeting, securely anchored. Providefor air circulation around stacks and under coverings.


PART 2 - PRODUCTS

2.1 WOOD PANEL PRODUCTS

A. Plywood: Either DOC PS 1 or DOC PS 2 unless otherwise indicated.

B. Thickness: As needed to comply with requirements specified, but not less than thickness indi-cated.

C. Factory mark panels to indicate compliance with applicable standard.

2.2 PRESERVATIVE-TREATED PLYWOOD

A. Preservative Treatment by Pressure Process: AWPA U1; Use Category UC2 for interior con-struction not in contact with the ground, Use Category UC3b for exterior construction not incontact with the ground, and Use Category UC4a for items in contact with the ground.

1. Preservative Chemicals: Acceptable to authorities having jurisdiction and containing noarsenic or chromium.

B. Mark plywood with appropriate classification marking of an inspection agency acceptable toauthorities having jurisdiction.

C. Application: Treat items indicated on Drawings and plywood in contact with masonry orconcrete or used with roofing, flashing, vapor barriers, and waterproofing.

2.3 ROOF SHEATHING

A. Plywood Roof Sheathing: Exterior, Structural I sheathing.

1. Span Rating: Not less than 24/0.2. Nominal Thickness: (Add No. 5-Dated 5/4/2015) As indicated on drawings Not less than 1/2 inch

(13 mm).

2.4 FASTENERS

A. General: Provide fasteners of size and type indicated that comply with requirements specified inthis article for material and manufacture.

1. For roof sheathing, provide fasteners with hot-dip zinc coating complying withASTM A 153/A 153M or Type 304 stainless steel.

B. Nails, Brads, and Staples: ASTM F 1667.

C. Power-Driven Fasteners: NES NER-272.

D. Wood Screws: ASME B18.6.1.


E. Screws for Fastening Wood Structural Panels to Cold-Formed Metal Framing: ASTM C 954,except with wafer heads and reamer wings, length as recommended by screw manufacturer formaterial being fastened.

1. For wall and roof sheathing panels, provide screws with organic-polymer or othercorrosion-protective coating having a salt-spray resistance of more than 800 hoursaccording to ASTM B 117.

PART 3 - EXECUTION

3.1 INSTALLATION, GENERAL

A. Do not use materials with defects that impair quality of sheathing or pieces that are too small touse with minimum number of joints or optimum joint arrangement. Arrange joints so that piecesdo not span between fewer than three support members.

B. Cut panels at penetrations, edges, and other obstructions of work; fit tightly against abuttingconstruction unless otherwise indicated.

C. Securely attach to substrate by fastening as indicated, complying with the following:

1. NES NER-272 for power-driven fasteners.2. Table 2304.9.1, "Fastening Schedule," in ICC's "International Building Code."

D. Coordinate roof sheathing installation with flashing and joint-sealant installation so thesematerials are installed in sequence and manner that prevent exterior moisture from passingthrough completed assembly.

E. Do not bridge building expansion joints; cut and space edges of panels to match spacing ofstructural support elements.

F. Coordinate sheathing installation with installation of materials installed over sheathing sosheathing is not exposed to precipitation or left exposed at end of the workday when rain isforecast.

3.2 WOOD STRUCTURAL PANEL INSTALLATION

A. General: Comply with applicable recommendations in APA Form No. E30, "Engineered WoodConstruction Guide," for types of structural-use panels and applications indicated.

B. Fastening Methods: Fasten panels as indicated below:

1. Roof Sheathing:

a. Nail or staple to wood framing.b. Screw to cold-formed metal framing.c. Space panels 1/8 inch (3 mm) apart at edges and ends.

END OF SECTION 061600

4056 VERTICAL LOOP REACTOR AND OXIDATION DITCH EQUIPMENT 463750 - 1

Addendum No. 5 – Dated 5/4/2015

SECTION 463750 - VERTICAL LOOP REACTOR AND OXIDATION DITCH EQUIPMENT

NEGOTIATED PRICE FOR VERTICAL LOOP REACTOR AND OXIDATION DITCH EQUIPMENT

- $1,730,200

NEGOTIATED PRICE FOR OXIDATION DITCH NOS. 1-3 WEATHER HOODS (AA #2) - $210,150

PART 1 - GENERAL

1.1 SCOPE OF WORK

A. Description of Work

1. Provide all labor, material and equipment to furnish and install the Vertical Loop Reactor

(VLR) and Disc Aeration Equipment as specified herein.

2. This specification covers the general requirements for the design, fabrication and installation of

a new three (3) tank VLR, and for modification of the three (3) existing oxidation ditches.

3. Scope of work includes Specification Sections 4693751 (VLR and Oxidation Ditches Biological

Process Performance Warranty), 463752 (Existing Siemens Cannibal System Control Panel

Modifications), and 468050 (Submersible Wall Pumps).

B. Work and Components Included (But Not Limited To)

1. The Equipment Manufacturer shall furnish the items listed below:

a. Aeration disc assemblies with hardware

b. Shaft assemblies

c. Shaft-mounted drive assemblies

d. Pillow block bearings with bearing seat

e. Weatherhood assemblies with related supports (additive alternate)

f. Aerator and Walkway support structure system

g. Tank-end turning vanes

h. Submersible mixers

i. Process control system

j. Stainless steel anchor bolts

k. Dissolved oxygen (DO) and oxidation reduction potential (ORP)

instruments/transmitters/sunshields

l. Submersible wall pumps (see 1.1.A.3 and Specification Section 468050)

m. Spare parts

2. Like items of equipment specified herein shall be the end products of one manufacturer in order

to achieve standardization for operation, maintenance, spare parts and manufacturer's service.

C. Related Work Specified Elsewhere:

1. The following items are specified under other sections of these specifications:



a. Cast-In-Place Concrete Section 033100

b. Precision Grouting Section 036000

c. Structural Steel Section 051200

d. Aluminum Handrails and Railings Section 055202

e. Aluminum Grating Section 055300

f. Slide Gates Section 333120

g. Channel Gates Section 333130

h. Weir Gates Section 333140

i. High Performance Paints and

Coatings - Wastewater Facilities Section 099610

j. Electrical Division 33

k. Earthwork Section 312000

l. Submersible Wall Pump Section 468050

1.2 ACCEPTABLE MANUFACTURERS

A. The Contractor shall use the following approved Manufacturer:

1. Evoqua Water Technologies of Waukesha, WI (formerly Siemens);

1.3 EXPERIENCE AND WARRANTY

A. The equipment Manufacturer shall comply with the following:

The equipment Manufacturer shall have not less than ten (10) successful years experience in the

design, construction and operation of VLR equipment at a minimum of twenty (20) different plants.

(Add No. 5-Dated 5/4/2015) Manufacturer must comply with an extended warranty valid for five (5)

years from the start-up of equipment and the performance bond as described herein equal to

100% of the equipment price.

B. (Add No. 5-Dated 5/4/2015) Not Applicable for this project. Performance Bond:

1. The performance bond shall be issued on the Manufacturer's standard form and shall be

executed by a surety named in the current list of "Companies Holding Certificates of

Authority as Acceptable Reinsuring Companies" as published in Circular 570 by the

Financial Management Service, Surety Bond Branch, US Department of the Treasury.

Bonds signed by an agent must be accompanied by a certified copy of such agent's

authority to act."

2. Manufacturer not already pre-qualified and approved by Engineer shall submit to

Contractor a Performance Bond within fifteen (15) days of the executed agreement

between Manufacturer and Contractor. The Performance Bond must adhere to the

requirements stated in 1.3.A of this Specification.

3. Manufacturer not already pre-qualified and approved by Engineer shall submit

manufacturing certificate to Engineer which indicates discs are fabricated in the United

States. Manufacturer shall also provide sample of discs to Engineer or Contractor to

verify the disc specification stated in 2.2.C.



C. Equipment Warranty:

The Equipment shall materially conform to the description in this Specification and the Contract

Documentation and shall be free from defects in design, material and workmanship, and will operate

satisfactorily. In the event the equipment fails to perform as specified, and after the Owner has given

due notice, the Contractor or Manufacturer, at their own expense, shall promptly repair or replace the

defective equipment without any additional cost to the Owner. Warranty period shall comply with

Specification Section 011400, “General Provisions”.

D. Process Performance Warranty:

The equipment manufacture shall provide a process performance warranty per specification 463751 –

VLR and Oxidation Ditch Biological Process Performance Warranty.

1.4 SUBMITTALS

A. Operating instructions, manuals and shop drawings shall be submitted in accordance with Sections

013323 and 017823.

1.5 EQUIPMENT MANUFACTURER'S SERVICE REPRESENTATIVE

A. Manufacturer's Field Service

1. The Manufacturer's mechanical field service technician shall check the installation of the

equipment, assist in the start-up, and provide training on the operation and maintenance of the

equipment. For the new equipment, a minimum of three (3) trips and eight (8) eight-hour days

shall be included for on-site checkout.

2. The Manufacturer's electrical field service technician shall check the installation of the

equipment, assist in the start-up, and provide training on the operation and maintenance of the

equipment. For the new equipment, a minimum of one (1) trip and four (4) eight-hour days shall

be included for on-site checkout.

B. Process Training

1. The Manufacturer's process engineer shall provide process training. Two (2) eight-hour process

training sessions shall be provided at startup (one trip). Additional process training shall be

conducted four (4) to six (6) weeks after the plant has begun receiving wastewater. At that time,

a review of the plant analytical and operational data will be reviewed and additional training

provided. Prior to the actual field visit, the manufacturer's process engineer will be in contact

with the plant operators to discuss operational issues including the actual process start-up. The

additional process training shall not be less than two (2) trips and a total of four (4) eight-hour

days at the site.



PART 2 - PRODUCTS

2.1 GENERAL

A. The design and layout shown on the design drawings are based on the Manufacturer listed in Section

1.2.A.1. If equipment other than that of the Manufacturer shown is submitted to the Engineer for

consideration as an equal, it shall be the responsibility of the Bidder wishing to make the substitution

to submit with the request a revised drawing of the mechanical equipment and tank layouts acceptable

to the Engineer. This revised drawing shall show the proposed location of the substitute unit, and area

required for withdrawal space of replacement or serviceable components. This drawing shall also show

clearances of adjacent equipment and service area required by that equipment.

B. Changes in civil, sanitary, architectural, structural, electrical, mechanical and plumbing requirements

for the substitution shall be the responsibility of the Bidder wishing to make the substitution. This

shall include the cost of redesign by affected designers. Any additional cost incurred by affected

subcontractors shall be the responsibility of the Bidder and not the Owner.

2.2 EQUIPMENT

A. General

1. There shall be provided, as shown on the design drawings, one biological wastewater treatment

system consisting of a new three (3) tank VLR, as well as modifications to three (3) existing

oxidation ditches as described herein.

2. The VLR shall consist of three (3) tanks, each with a dimension of 200-feet Long x 30-feet

Wide x 21-feet Side Water Depth arranged with common intermediate walls. Raw wastewater,

after entering the system, shall pass progressively through the VLR tanks in series. The effluent

from the VLR tanks is controlled by three weir gates in an integral splitter box which distributes

VLR effluent flow to the three (3) existing oxidation ditches. The three (3) existing oxidation

ditches operate in parallel with each other, and in series with the VLR. The oxidation ditch

effluent shall then be directed to the final clarifiers. The raw sewage may be introduced into any

one of the three (3) VLR tanks or to the splitter box upstream of the oxidation ditches,

depending upon the operating conditions. Recycled sludge shall be returned to the first or

second VLR tank under normal operating conditions. The flow from one aeration tank to

another shall be by displacement of the mixed liquor circulating in each basin through

submerged gates interconnecting each adjacent aeration tank. A horizontal concrete baffle will

allow flow to move in a circular direction in each aeration tank, over the baffle in the influent to

effluent direction and under the baffle in the effluent to influent direction. The underside of the

concrete baffle will allow for trapped air to come into contact with the wastewater for a longer

period of time. The displaced flow shall be equal to the volume of raw wastewater and recycled

sludge introduced into the tank.

3. All slide, channel, and weir gates shall be furnished by the Contractor.

B. Disc Aeration Equipment

1. Eight (8) 25 HP complete disc rotary aerator assemblies shall be provided for installation in the

new VLR tanks, as shown in the design drawings.



2. Each of the eight (8) 25 HP aerator assemblies installed in the new VLR tanks shall consist of

one (1) solid shaft with a total of forty (40) aeration discs installed. Each installed aerator shall

be capable of transferring 76 lb O2/hr at a maximum of 52 rpm and 17 inches of disc immersion

at standard design conditions in aeration tank 1. The Manufacturer shall submit data in the bid

to the Contractor verifying this capability.

3. Twelve (12) 40 HP complete disc rotary aerator assemblies shall be provided for installation in

the existing oxidation ditches, as shown in the design drawings.

4. Each of the twelve (12) 40 HP aerator assemblies installed in the existing oxidation ditches shall

consist of one (1) torque tube shaft with a total of fifty (50) aeration discs installed. Each

installed aerator shall be capable of transferring 110 lb O2/hr at a maximum of 55 rpm and 18

inches of disc immersion at standard design conditions. The Manufacturer shall submit data in

the bid to the Contractor verifying this capability.

5. The aerator assemblies shall be manufactured by Evoqua Water Technologies.

C. Aeration Discs

1. There shall be provided not less than three-hundred twenty (320) circular aeration discs in the

VLR. An additional six-hundred (600) circular aeration discs shall be provided for the existing

oxidation ditches, as well. All circular aeration discs shall be located as determined by the

supplier in order to provide the required oxygen requirements.

2. The discs shall be fabricated of 1/2" (13 mm) thick molded plastic compound resistant to any

corrosive action of the mixed liquor being aerated. A multiplicity of cavities and raised

triangular protrusions shall be provided in the disc to cause entrained air to be dispersed in the

mixed liquor.

3. The aeration discs will be firmly attached to the shafting by means of a shaft locating collar.

This shaft locating collar will be an integral part of the aeration discs. To enable the individual

discs to be attached, adjusted, or removed from the shafting without disturbing the shafting,

discs will be split in half sections. Bolts, washers and nuts will be 304 stainless steel.

4. Contractor shall be required to field install discs and set disc location along the shaft as required

to meet the specifications and the treatment process as determined by the Manufacturer and the

Engineer.

5. The individual discs shall be adjustable to a minimum 5" (127 mm) spacing at any location to

provide flexibility in oxygen delivery.

D. Aerator Shafting

1. Aerator shafts for the VLR tanks shall be made from solid, 6" (150 mm) diameter, SAE 1045

machine steel bar stock, turned and polished. Shaft ends shall be true concentric within 0.008"

(0.203 mm) total indicator reading. Shaft end tolerance shall be +0.000" and -0.001" (-0.025

mm).

2. For the existing oxidation ditches, the central aerator shaft/torque tube shall be made from 12¾”

outside diameter, schedule 80, steel pipe conforming to ASTM-A53, Grade B steel pipe

specifications with a wall thickness of 0.688”, and machined end flanges.

3. For the existing oxidation ditches, the shaft ends shall be one-piece ASTM-A536 (DI 66-45-12)

cast ductile iron with machined flanges matching the end flanges of the torque tube, and with

smaller diameter stub shafts machined to suit the bearings and shaft-mount drive assemblies.

Each drive stub end will have an extended shaft fitted with a key for mounting the drive

assembly.

4. Shafts/Tubes to be blast cleaned per SSPC-SP10-63. Shafts shall have two (2) coats of Sherwin



Williams, Dura-Plate 235 B67A235 Haze Gray to a finish dry film thickness of 8 to 12 mils, or

equal. Shafts shall be supplied with manufacturer’s standard paint to ensure proper fit-up

between the aeration discs and the disc aerator shaft system which provides the grip required for

this application.

5. Shafting shall be capable of withstanding all dead, live, and radial loads imposed on them.

6. For the existing oxidation ditches, shaft/torque tube and shaft ends shall be field assembled by

the contractor.

7. For the existing oxidation ditches, baffle discs of Type 304 stainless steel shall be provided at

each end of the aeration assembly per Manufacturer recommendation.

E. Bearings

1. Each shaft shall be supported by self-aligning, grease lubricated, roller bearings with split

pillow block housings. Housings shall be cast iron coated for extreme harsh environment

corrosion protection par Manufacturer’s standard coating system.

2. Each pillow block will have double row spherical roller bearings and single (far end) or double

(non-expansion end) locking collars (depending on bearing size). Each locking collar will have

two (2) setscrews. Bonded elastomeric, triple-lip contact seals with flingers that rotate with the

shafting shall be provided to insure positive sealing against contaminants. The seals shall be

designed for operation in a moisture laden environment and will seal effectively, even with up to

+/- 1 degree of misalignment.

3. Minimum L-10 bearing life will be 200,000 hours.

F. Drive (Shaft-mounted)

1. The drive mechanism for each aerator assembly shall consist of a single speed motor and a shaft

mounted AGMA Class II helical gear reducer sized for 24 hour continuous operation with

allowance for moderate shock loads. The motor and reducer shall be fully suitable for outdoor

service and exposure to the atmosphere encountered, and will be coated for corrosion protection

according to the manufacturer’s standards.

2. A torque arm shall be provided to secure the reducer in position. Power transmission between

the motor and reducer shall be by means of belts and sheaves, and shall be protected by an

OSHA-acceptable guard. Guard shall be fabricated from commercial quality steel, and coated

for corrosion protection according to the drive manufacturer's standards. For the VLR tanks,

each drive shall be supplied with belts and sheaves to produce a maximum aerator speed of 52

rpm. For the existing oxidation ditches, each drive shall be supplied with belts and sheaves to

produce a maximum aerator speed of 55 rpm.

3. Motors shall be 25 and 40 HP, respectively, TEFC, 1800 RPM, 460-volt, 3-phase, 60 Hz,

squirrel cage, induction type, NEMA Design B, with Class F insulation and a 1.15 service

factor. All motors shall be compatible with variable frequency drive (VFD) controller (inverter

ready duty for a 4:1 turndown), and shall be premium efficiency design. Each motor shall be

horizontally mounted on an adjustable base to facilitate belt tensioning. Motor bearings shall be

grease lubricated. Motors shall be provided with motor winding thermostats for automatic

shutdown of motor upon motor overheating. Space heaters are not required for this application.

If the motors will be installed within 18” of the top of the basin wall, they shall be suitable for

use in Class I, Division 2, Group C and D hazardous locations, as well as all accessories.

G. Aerator and Walkway Support Structure System



1. Structural supports shall be provided by the Manufacturer to span the VLR tanks and existing

oxidation ditches, as shown on the design drawings.

2. For the new VLR tanks, provisions shall be made with the structural supports for mounting the

disc aerator assemblies and weather hoods, as well as the submersible mixers. Additional

grating supports for VLR tank shall be provided by the Manufacturer as required at each end of

the support structures for access to the aerator equipment, as shown on the design drawings.

Additional support structure shall be provided by the Manufacturer as required for walkways

spanning the VLR tank as shown on the design drawings.

3. For the existing oxidation ditches (if Additive Alternate #2 is Selected), provisions shall be

made with the structural supports for mounting the weather hoods and the access

walkways/catwalks that are adjacent to the weather hoods. Each structure shall also include

multiple grating support members to be attached to the existing walkway/bridge and to the hood

support closest to the walkway/bridge. Where no adjacent walkway/bridge is available, an

additional support structure spanning the tank shall be provided. The grating support members

for these conditions shall be installed between the support structures. These members shall

provide support for a horizontal access platform/catwalk adjacent to the weather hoods. The

access platform/catwalk grating/planking shall be provided by the installing contractor. The

support members shall be fabricated from commercial quality steel, and shall be coated for

corrosion protection according to this proposal.

4. All supports shall be designed to withstand all forces incurred during normal operation.

Supports shall be fabricated from commercial quality steel and coated via hot-dip galvanizing

for corrosion protection according to this specification.

5. All Structural supports shall be hot-dip galvanized per ASTM A123.

6. All handrail, grating, access ladders and/or stairs, safety chains, etc. shall be provided by

Contractor. Installing contractor shall be required to drill and/or tap holes as required to mount

the handrail and grating to the aerator and walkway support structures. Mounting hardware for

the grating and handrail shall also be provided by installing Contractor. Grating and handrail

shall be aluminum.

H. Weather Protection (Base Bid for VLR tanks and additive alternate for existing oxidation ditches)

1. Weather hoods with support structures shall be provided to prevent the aeration discs from icing

in cold weather, as well as spray propagation.

2. Hoods shall be constructed of 3/16" (4.76 mm) thick fiberglass with dimensions sufficient to

assure clearance between the rotating aeration disc and shafting, and the hood. Support

structures shall be galvanized steel. Hold down latches shall be provided to prevent uplift due to

wind.

3. The weatherhood shall withstand 100 mph (161 km/hr) wind load and 40 lb/sq ft (195 kg/sq

meter) snow load without deforming or failing.

4. Fiberglass used in the construction of the weatherhood assembly shall have the following

properties:

Tensile Strength, average = 12,000 psi

Flexural Strength, average = 20,000 psi

Flexural Modulus, average = 900,000 psi

Glass Content, average = 25%-28%

5. Hoods shall be hinged and of sufficiently light weight such that hood sections can be raised

manually. Support bars shall be provided with self-locking pins at each end to prop the hood in



a raised position and prevent uplift due to wind. Each raised hood section shall provide

accessibility to aerator to facilitate addition, removal, or relocation of discs.

6. Hoods shall include fixed fiberglass end panels designed to provide splash protection. Neoprene

seals shall be attached to the end panels to prevent water from moving along the shaft to the

bearing.

7. All installation and assembly hardware shall be 304 stainless steel.

I. Wall Seal Plates (for existing oxidation ditches only)

1. Seal plates with related gaskets and anchors shall be provided for each aerator where the shaft

passes through the walls to help prevent entrance of liquid into the bearing and drive areas.

2. Seal plate assemblies shall consist of an aluminum splash/seal plate. A minimum of ¼”

neoprene gasket shall be used between any surfaces. Seal plates and splash guards will include

stainless steel assembly hardware, anchors and neoprene gaskets or spacers to prevent galvanic

corrosion between stainless steel hardware and aluminum materials.

3. Components for the seal plate assemblies shall be shipped loose for field assembly and

installation by the Contractor in accordance with the manufacturer’s instructions, and design

drawings.

4. Neoprene seals shall also be provided for installation between the concrete and the seal plate,

and where the shaft passes through the plate.

5. Dimensions shown on design drawings require field verification.

J. Tank-end Turning Vane

1. An upper tank-end turning vane shall be provided for the end of each VLR tank downstream

from the disc aerators.

2. Turning vanes shall be mounted at or near the maximum water level designed to divert the flow

direction in the basin under the horizontal baffle and help maintain flow velocity.

3. Turning vanes and mounting brackets shall be fabricated from commercial quality steel, and

coated with hot-dip galvanized per ASTM A123 for corrosion protection.

4. Stainless steel assembly and anchoring hardware shall also be provided.

K. Submersible Mixers

1. Two (2) submersible mixers shall be provided for mounting on the access bridge in the first

VLR tank as shown on the Contract Drawings. Mixers shall be EMU model TR216.72-4/8 or

equal. Each mixer shall be capable of the following performance:

Minimum Propeller Diameter, inches (mm) 63 (1600)

Number of Propeller Blades 2

Maximum Propeller Speed, rpm 72

Minimum Flow, gallons per minute (m³/s) 34,000 (2.15)

Minimum Thrust, pounds force, lbf (N) 521 (2300)

Maximum Motor Speed, rpm 1800



Maximum Nominal Motor HP per unit 5.6

Maximum Power Consumption at rated duty, hp 5.2

Minimum Motor Reserve at rated duty, % 30

Minimum Submergence, maximum value in feet (mm) 2.6 (800)

2. MIXER HOUSING

a. All major components of the mixing unit (i.e. stator housing, seal housing, and cable

entry) shall be manufactured from close-grained ASTM A48 Class 35 or higher

(GG25) cast iron.

3. PROPELLER

a. Propellers shall be manufactured from polyester resin reinforced by laminated sheets of

fiberglass (GFK). No welded steel or stainless steel propeller shall be accepted.

b. The propeller shall have a swept-back profile and at least 2 blades. The propeller

blades shall be thicker on the leading edge than the trailing edge and thicker towards the

hub than at the tip to allow the propeller to free itself from rags as it turns. The blades

shall be smooth, finished throughout, and shall be free from sharp edges.

c. Propellers shall be statically and dynamically balanced.

d. Propellers shall be slip fit and securely held to the shaft by a stainless steel washer and

bolt assembly that is enclosed in a separate hub chamber. The hub chamber is fitted

with an O-Ringed cap that seals the entrance of the propeller hub chamber device. The

output shaft shall be splined to mate with the matching spline insert of stainless steel

that forms the hub of the propeller.

4. PROPELLER SHAFT

a. The shaft connecting the propeller to the gear reducer shall be constructed of AISI 329

(1.4462) stainless steel.

b. Minimum propeller shaft diameter (D), measured at the outermost bearing shall be:

2.75 inches (70 mm).

c. The propeller shaft shall be supported such that the length (L) from the outermost

bearing to the hub of the propeller shall not exceed 3.87 inches (98.35 mm). The shaft

overhang ratio of the distance from the bearing to the hub of the propeller (L) divided

by diameter of the shaft at the bearing (D) shall not exceed 1.5.

5. BEARINGS

a. Each mixer shall be furnished with a minimum of four (4) sets of bearings spaced to

minimize shaft deflection to offer maximum bearing life. At a minimum, at least one

set of the bearings shall be of double row design. Designs with fewer than four (4) sets

of bearings shall not be allowed.

b. A minimum of two sets of bearings shall support the propeller shaft (shaft from gear

box to the propeller). Designs where the propeller shaft is supported solely by the



gearbox shall not be acceptable.

c. Mixer shaft overhang and bearing design shall provide a minimum B10 life of 100,000

minimum at design point.

d. Bearings shall be sealed, grease lubricated and maintenance-free.

6. MECHANICAL SEALS

a. Each submersible mixer shall be provided with two separate seal chambers. The inner

chamber shall be located between the dry stator chamber and the gear reduction

chamber and shall contain a minimum of 1.1 liters of oil. The outboard seal chamber

shall be located between the gear reduction chamber and the outside of the mixer at the

hub of the propeller and shall contain a minimum of 1.0 liters of oil.

b. Each seal chamber shall be provided with an independent set of mechanical seals and a

lip seal running in an oil bath. The inboard set of seals shall be mounted in the

chamber between the motor and gearbox. The outboard set of seals shall be mounted

between the gearbox and the propeller.

c. Each mechanical seal set shall be provided with solid sintered silicon carbide seal face

material on both the stationary and rotating components. Both the inboard mechanical

seal set and the outboard mechanical seal set shall be silicon carbide.

d. The outboard mechanical seal shall be protected from debris, rags and stringy materials

by an AISI 304 stainless steel deflection ring. Designs without a stainless steel

deflection ring shall not be acceptable.

e. The metal components of the mechanical seal case shall be constructed of AISI 304

stainless steel.

f. A moisture sensor probe shall be furnished in both of the seal oil chambers of each

mixer. Each sensor shall be wired to the control panel and shall activate an alarm light

upon seal failure. This alarm light shall indicate the seal failure location, either inboard

or outboard. See Electrical Drawings for detailed control schematic.

g. The outboard seal sensor probe shall be externally located and accessible for

maintenance without the need to disassemble the mixer for service or replacement.

7. GEAR REDUCER

a. The motor shall drive the submersible mixer propeller through a two stage planetary

gear reduction drive system that locates the motor shaft in line with the propeller shaft.

Each stage shall be independent and contain a separate keyed sun gear and three

planetary gears as described below.

b. The motor shaft shall be fitted with a keyed sun gear that uses high efficiency straight

cut teeth to engage the planetary gear section.

c. The sun gear system shall be custom matched to the planetary gear system to allow for

propeller speed changes in the field by a simple exchange of the sun gear and the

planetary gear plate.

d. The planetary gear section shall consist of three identical gears mounted on a stainless

steel backing plate designed to withstand 100% lock stress from the propeller without

gear or bearing damage.

e. Each planetary gear shall be supplied with precision needle bearings, which are

lubricated by the gear lubricant in the gear chamber. The gear chamber shall contain a

minimum of 0.6 liters of oil.

f. There shall be a minimum of three planetary gears spaced 120 degrees around the



central sun gear.

g. The planetary gear section shall be easily removed and shall be interchangeable with

other ratios and for simplified spare parts inventory.

h. The planetary gear section shall also engage a ring gear mounted in the outer surface of

the gear chamber which shall cause the motor rotation to also rotate the planetary gear

plate which shall be fitted to the output propeller shafting by the use of a straight

splined connection.

i. The planetary gear plate shall be retained on the output propeller shaft by the use of a

snap ring and snap ring groove in the output shaft.

j. The planetary design shall be designed such that with regular oil changes, no further

maintenance should be required during the life of the submersible mixer in the

installation. The gears shall have a minimum L-10 life of not less than 100,000 hours at

the rated duty.

k. Gear oil changes shall be easily made using external stainless steel pipe plugs that are

sealed via nylon washers.

l. Standard 80 to 90-weight gear oil either normal or synthetic shall lubricate the gear

section.

8. SUBMERSIBLE MOTORS

a. Each mixer shall be furnished with a squirrel cage, induction motor enclosed in a

watertight housing suitable for use and compatible with all variable frequency drive

systems.

b. The motors shall be air-filled and constructed with moisture resistant NEMA Class F

insulation and Class F slot liners and constructed to NEMA B design standards. The

copper wound stator shall be dipped in epoxy enamel and hardened to withstand a

temperature of 155 degrees Centigrade as defined in NEMA Standard MG-1. Each

winding phase or layer shall be laced with Class F glass lined paper. The use of cable

ties to restrain windings shall not be allowed. The rotor shall be statically and

dynamically balanced after fabrication. The rotor shall utilize aluminum amortisseur

bars and short circuit rings. The constructed motor shall be certified for continuous

duty with a service factor of 1.15. Motor voltage shall be 460-volt, 3-phase, 60 Hz.

c. Motors shall be capable of sustaining 15 starts per hour (unlimited starts with VFD) at

an ambient temperature of 40°C.

d. Motors shall be capable of uninterrupted operation with a voltage drop of 10%.

e. Thermal switches shall be furnished to monitor stator temperatures. The stator shall be

equipped with two (2) thermal switches. Thermal switches shall automatically

de-energize the motor when its temperature exceeds a preset limit as recommended by

the manufacturer. See Electrical Drawings for detailed control schematic.

f. Option: The motor shall bear the FM (Factory Mutual) explosion-proof label certifying

its use in a Class 1, Division 2, Groups C & D hazardous location.

g. The manufacturer's nameplates shall be engraved, laser etched or stamped on stainless

steel and fastened to the motor casing.

9. SHAFTS

a. Motor shafts shall be AISI 420 (1.4021) stainless steel. Carbon steel shafts or shafts

with sleeves of any type are not acceptable. The shaft shall be one piece construction

without joints or stubs attached.



b. Minimum shaft diameter shall be 1-3/8 inches (35 mm) at the double bearing motor

shaft bearing.



10. POWER AND CONTROL CABLES

a. Power and control cables shall be furnished with sufficient length to run un-spliced

from the mixer to the NEMA 4X junction box (handrail-mounted) as shown on the

Contract Drawings and as specified herein. Submersible cables shall be converted to

single conductors within the junction box via power terminal blocks (see Electrical

Drawings for details). Sealing connectors (Class I, Division 2 listed) shall be provided

for cables entering the junction box.

b. The cables for each mixer motor shall pass through the galvanized cast iron strain relief

component and then through a series of stainless steel disks and Buna-n grommet that

is sandwiched between the disks to control compression of the grommet. The cable

entry design shall be of the type recommended in the Factory Mutual Research

Corporation specifications for Explosion Proof Certification. The entry shall be

comprised of the cast iron fitting that will include the Buna-N strain relief grommet

coupled with a poured conductor section. In the poured section, only Factory Mutual

approved sealant shall be used to wick into each conductor strand that has the

insulation removed in this area to provide a positively leak proof seal for the power and

sensor cords.

11. GUIDE RAIL SYSTEM

a. A guiderail system shall be provided that is fixed in place and uses a stainless steel

base bolted to the floor and trusss shaped support to hold the mixer in a fixed position.

The guide rail shall consist of a 4” x 4” Type 304 stainless steel tube and have a length

of 20 ft.

b. The bottom assembly shall be bolted to the floor of the tank, and provide support for

the guide pipe. It shall also include a hole to accept the guide pipe bottom plug. The

bottom console and guide pipe shall be constructed of AISI 304Ti stainless steel.

c. The assembly shall be strong enough to support the weight of the mixer, the guide pipe

and the mixer preload force. The assembly shall be positioned in such a manner so as

to prevent the mixer blade tips from hitting the basin floor. The mixer support shall be

constructed of AISI 304Ti stainless steel.

d. The upper guide holder assembly shall secure the system to the tank edge or platform.

It shall also provide the lateral support for the guide pipe. The assembly shall contain a

location to secure the electrical motor cable holder.

e. Mixer support frame (including angular adjustment brackets) shall be manufactured

from: AISI 304Ti Stainless Steel as detailed in the submersible mixer tabulated data

listing above.

12. HOIST (CRANE) ASSEMBLY:

a. A hoist system shall be used for lifting and lowering of the mixer on the guide rail

during installation and maintenance. The system shall be capable of 360 degree-

rotation. Each hoist assembly shall be rated at a minimum of 500 pounds. All crane and

receiving boxes shall be constructed of AISI 304 stainless steel. The sleeves and the

bearings in the receiving box shall be constructed of Nylon (PA).



L. Process Control Systems

1. The process control system shall contain all interlocks, alarm functions and motor control as

required for operation of the system. It shall be manufactured by Evoqua Industry, Inc., or equal.

2. Control System Function

a. The system shall be designed to monitor oxidation reduction potential (ORP) in the

VLR tanks and dissolved oxygen (DO) in the existing oxidation ditches, and control

oxygen delivery based on the ORP, DO and process objectives. Oxygen shall be

controlled by varying the speed of the VFD controlled disc aerators.

b. Plant influent flow shall be monitored and the point of application of the influent shall

be adjusted during high flow events to enter the Stormflow mode of operation and

prevent solids loss in the clarifiers. Control system shall control operation of

electrically actuated valves on influent line to switch between normal and storm flow

modes of operation.

c. Nitrate recycle pumps shall be controlled by VFDs and a flow meter to flow pace with

the influent flow. Nitrate recycle flow shall be monitored.

d. RAS pumps shall be controlled by VFDs and a flow meter to flow pace with the

influent flow. RAS flow shall be monitored.

e. VLR Recirculation pumps (typical of 2) shall be controlled by VFD’s.

f. VLR Submersible mixers (typical of 2) shall be controlled via full voltage, non-

reversing motor starters. On-Off control via the VLR control system.

g. Diversion Valves (typical of 4 – IFM Valve No.1A, 1B, 2A, and 2B) shall be

controlled via full open-full close actuator. Open-Close control via the VLR control

system.

h. Diversion Valve shall be controlled via full open-full close actuator. Open-Close

control via the VLR control system.

i. Owner shall supply a dedicated phone line and or high speed VPN (virtual private

network) connection for remote monitoring and or engineering support of the process

control system.

j. All of these functions shall be incorporated in a single package from the provider of the

VLR and disc aerator equipment. Any Motor Starters and/or VFDs, Motor Starter

Equipment, and Motor Control Centers shall be provided by the Electrical Contractor.

k. Control system shall allow operation of plant as an A2O, UCT standard, or UCT

modified process.

3. Control Panel

a. Design and construction shall conform to the latest edition of the NEC. There shall be a

main power on/off switch for the control system rated for the voltage and current

required. Individual branch circuit breakers shall be provided as required.

b. The panel shall incorporate a Programmable Logic Controller (PLC) for accomplishing

the control logic. The PLC shall be capable of online program editing without stopping

the process control system. A minimum of 16k of memory shall be provided for user

program. The system shall include battery backed program memory as well as an

EEPROM for program backup. The PLC processor shall be an AB ControlLogix, or

equal.



c. The PLC shall allow analog inputs of the 4-20 mA type and shall be provided for the

following signals:

(1) 1st VLR Tank ORP

(2) 2nd VLR Tank ORP

(3) 3rd VLR Tank ORP

(4) Oxidation Ditch #4A Tank dissolved oxygen

(5) Oxidation Ditch #4B Tank dissolved oxygen

(6) Oxidation Ditch #4C Tank dissolved oxygen

(7) Influent Flow (Total flow of both force mains)

(8) RAS Flow

(9) Nitrate Recycle Flow

(10) Feedback from each of the connected VFD's (20 aerator drives, 4 RAS

pumps, 4 Nitrate recycle pumps, 2 VLR Recirculation pumps)

d. The PLC shall provide analog outputs of the 4-20 mA type and shall be provided for

the following:

(1) Nitrate Recycle Pump VFD Speed Control (typical of 4)

(2) RAS Pump VFD Speed Control (typical of 4)

(3) Oxidation Ditch Disc Aerator VFD Speed Control (typical of 12)

(4) VLR Disc Aerator VFD Speed Control (typical of 8)

(5) VLR Recirculation Pump VFD Speed Control (typical of 2)

e. The PLC shall contain analog inputs/outputs of the 4-20 mA type and shall be provided

as per design drawings. See I-0-600 series drawings for all required analog

inputs/outputs required to/from the PLC.

f. Digital I/O shall be provided as per design drawings. See I-0-600 series drawings for

all required digital inputs/outputs required to/from the PLC.

g. An Operator Interface shall be provided for entering selected functions and operating

variables. The Operator Interface shall be an Evoqua Comfort Panel 1500, or equal.

The panel shall use Evoqua Simatic WinCC Flexible HMI software, or equal.

h. An emergency stop button shall be provided to disable all outputs and stop all drives in

an emergency.

i. Where used, operator lights and switches shall be industrial duty, rated NEMA 4X, and

be 30.5mm nominal size. Pilot lights shall be of the push to test type. Relays supplied

shall be industrial plug-in type, minimum DPDT, with contacts rated for 10 amps.

Timers shall be multi-range, multi-function, industrial plug-in type. All wiring in the

control panel shall be in wire-ways or suitably tie-wrapped to provide for neat

appearance. All wires which connect outside the panel shall terminate on NEMA rated

terminals.

j. Operator Interface shall use green to indicate start/on and red to indicate stop/off.

k. The Main Control Panel shall be NEMA 12 enclosed and located within Electrical

Building No.2.

l. Communication with the Plant SCADA System shall be provided. The Supplier shall

coordinate with the Instrumentation Contractor to establish the communications

between the Main Control Panel and the Plant PCIS. The Supplier shall coordinate

with the Systems Integrator to establish status functions, as shown on the I-0-600 series

Contract Drawings, between the Main Control Panel and the PCIS. The Main Control



Panel PLC shall be provided with communication option or connection to an Ethernet

Switch shall be provided by the Supplier.

4. Instruments

a. Three (3) dissolved oxygen probes and mounting kit shall be supplied. The probes

shall be Hach LDO (part no. 5790000), or equal. One (1) SC200 transmitter shall be

supplied for each probe. The probe handrail mounting kit shall be constructed of

aluminum and located as shown on the Manufacturer’s submittal drawings. They shall

have a 4-20 mA output for transmission of the signal to the PLC.

b. Three (3) ORP probes and mounting hardware shall be supplied. The probe shall be

Hach (part no. DRD1R5), or equal. One (1) SC200 transmitter shall be supplied for

each probe. The probe handrail mounting kit shall be constructed of aluminum and

located as shown on the Manufacturer’s submittal drawings. They shall have a 4-20

mA output for transmission of the signal to the PLC.

5. Control Programming

a. The aeration control program will control using a system approach. Oxygen delivery to

the entire process will be determined using all sensor inputs rather than each sensor

control aerators in discrete reactors.

b. The ORP and DO control will be based upon Evoqua Water Technologies “Variable

Set Point” control, or equal.

M. Anchor Bolts

1. All anchor bolts shall be stainless steel adhesive-type, furnished by the Manufacturer, and set

with proper projection by the Contractor in accordance with approved, certified drawings

furnished by the Manufacturer.

N. Painting

1. Bearing base plates shall be blast cleaned per SSPC-SP10 followed by one (1) factory applied

coat of Sherwin Williams Dura-Plate 235 epoxy to 4 to 6 mils DFT, or equal. Finish painting

shall be done in the field by the installing contractor after equipment installation and alignment.

2. Exposed machined surfaces - solvent wiped followed by one (1) coat of shop preservative.

3. Non ferrous materials stainless steel, aluminum, and galvanized surfaces unpainted.

4. Reducers, motors, base plates, guards and other related drive components shall be coated per the

manufacturer's standards at the factory.

5. Bearings and couplings – manufacturer’s standard coating at the factory.

6. Support structures for access walkways, equipment mounting structures, upper turning vanes,

and splash shield mounting brackets shall be hot-dip galvanized per ASTM A123.

7. Provide balance of painting and surface preparation per High Performance Paints and Coatings

– Wastewater Facilities, Section 099610.

8. Contractor to provide field touch-up panting of items that were finish painted at the factory.

Contractor to use same coating for touch-up (same manufacturer, product number, and dry film

thickness) as original factory coating.



O. On-Site Equipment Storage

1. Aeration Discs:

Store discs in the containers in which they are shipped. Do not stack containers more than two

(2) high. If stored outside, the containers should be placed on dry, level surface with adequate

drainage. Cover containers to protect discs from prolonged exposure to the sun. Store away

from any area which could expose them to flame or sparks (i.e., welding torch-cutting, etc.).

2. Central Shafts:

Store shafting in the same manner as shipped. Store on dry, level surface with adequate

drainage.

3. Drives and Bearings:

Store inside (if reasonably possible) or cover to protect from elements.

P. Spare Parts

1. Twelve (12) Complete Disc Assemblies

2. One (1) of each type and size of Bearing (Fixed and Floating)

3. One (1) set of Drive Belts and Sheaves for each drive size

4. One (1) set of O-rings for each mixer size

5. One (1) set of seals and bearings for each mixer size

PART 3 - EXECUTION

3.1 INSTALLATION

A. The Contractor shall install the VLR / Oxidation Ditch System as shown on the design drawings.

B. Equipment shall be installed in accordance with GENERAL MECHANICAL REQUIREMENTS and

in accordance with the Manufacturer's recommendations to provide a complete installation.

C. The Contractor shall level, align shafting, install drives, aeration discs and weather hoods/splash

shields in accordance with the Manufacturer's drawings and installation manual.

D. Support structures and disc aerator components are to be off-loaded and installed in the tankage by

means of a crane and suitable rigging. Rigging is to include a spreader beam or load leveler, slings,

etc., and is not provided by the Manufacturer. Special care must be taken to prevent damage to the

equipment and any protective coatings. Off-loading and installation will be accomplished in

accordance with Manufacturer instructions.



3.2 ELECTRICAL CONNECTIONS AND WIRING

A. Wiring and conduits for electrical power, control and instrumentation will be provided by the Electrical

Contractor under Division 33 - Electrical.

END OF SECTION 463750

section 061600 – sheathing · 2015-05-05 · materials are installed in sequence and manner that...

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