Addendum 4.pdf

Port of Tillamook Bay – WWTP Dechlorination and Ammonia Removal Addendum No. 4 – October 17, 2024

Port of Tillamook Bay WWTP Dechlorination and Ammonia Removal

Addendum No. 4 October 17, 2024

Modification to Plans and Contract Documents

This Addendum forms a part of the Bid Documents by amending and supplementing the original documents and Drawings. This Addendum shall be signed and included with the Bid as pre-qualification of the bid. This Addendum does not change the bid time or date.

CHANGES TO CONTRACT DOCUMENTS:

11500 POSITIVE DISPLACEMENT BLOWERS

Remove SECTION 11500 – POSITIVE DISPLACEMENT BLOWERS and replace with updated specification at the end of this document.

SHEET C5 – AMMONIA TREATMENT

Revised note for positive displacement blowers

FROM:

“INSTALL (2) HOFFMAN HLS SERIES MODEL: ES 35 /2 P POSITIVE DISPLACEMENT LOBE

BLOWER PACKAGE W/ 10HP MOTOR (ONE DUTY AND ON SPARE) OR APPROVED

EQUAL. BLOWERS PROVIDED IN OUTDOOR RATED ACCUSTICAL ENCLOSURES.

LOCATE BLOWERS ON APPROPRIATLY SIZED CONCRETE PAD PER MANUFACTURE

RECOMMENDATIONS. SEE SHEET C12 FOR DETIALS”

TO:

“INSTALL (2) ECONO-TOP SERIES 10 HP POSITIVE DISPLACEMENT BLOWERS (ONE

DUTY AND ONE SPARE) OR APPROVED EQUAL. BLOWERS PROVIDED IN OUTDOOR

RATED, ACOUSTICAL ENCLOSURES. SEE C9 FOR DETAILS. LOCATE BLOWERS ON

APPROPRIATLY SIZED CONCRETE PAD PER MANUFACTURE RECOMMENDATIONS.

SEE SHEET C12 FOR DETIALS”

ADD: INSTALL 10HP VFD BLOWER CONTROL WITHIN NEMA 4 CABINET ON THE

WESTERN EXTERIOR FACE OF THE EXISTING CHLORINATION BUILDING. INSTALL SUN

SHIELD TO LIMIT SUN EXPOSURE.

See revised plan sheet.

SHEET C12 – DETAILS 2

Revised detail sheet

REMOVE:

Hoffman Lamson Enclosure Detail

ADD:

Econo-Top Series Blower Detail

See revised plan sheet.

CLARIFICATIONS:

Port of Tillamook Bay – WWTP Dechlorination and Ammonia Removal Addendum No. 4 – October 17, 2024

There are no Clarifications to add to this addendum.

ATTACHMENTS TO THIS ADDENDUM:

• SECTION 11500 – POSITIVE DISPLACEMENT BLOWERS

• SHEET C5 AMMONIA TREATMENT

• SHEET C12 DETAILS 2

This addendum must be acknowledged and included with the Proposal.

Acknowledged By:

Signature of Proposer

Title

Name of Firm

Date

PORT OF TILLAMOOK BAY – WWTP Dechlorination and Ammonia Removal Section 11500 Project #2020-020.01 Positive Displacement Blowers

HBH Consulting Engineers, Inc. Page 1

SECTION 11500 – POSITIVE DISPLACEMENT BLOWERS

PART 1 GENERAL

1.1 SCOPE

A. Description of Work

1. Provide all labor, material and equipment to furnish and install (1) complete set(s) of positive displacement blower system(s) as specified herein and/or detailed on the drawings.

2. This specification covers the general requirements for the design, fabrication and testing of the blowers and their appurtenances.

B. Work and components included (But not limited to the following items) for each blower assembly.

1. Positive displacement blower

2. Drive unit

3. V-Belt drive

4. Flexible expansion joints

5. Drive guard

6. Common elevated structural steel base

7. Inlet filter

8. Inlet silencer

9. Discharge silencer

10. Pressure relief valve

11. Check valve

12. Discharge isolation valve

13. Pressure gauge (inlet and discharge)

14. Temperature Gauge (discharge)

17. Vibration isolation pads

18. Prime and Finish paint

19. Spare parts

HBH Consulting Engineers, Inc. Page 2

C. Related Work Specified Elsewhere

1. The provisions of this section are a direct extension of Section 15000, GENERAL MECHANICAL, and although set forth only once within the specifications shall apply equally to this section.

2. Part numbers or trade names are used in the body of this specification only to facilitate the description of the equipment and in no way implies that equipment of other approved manufacturers cannot be used.

D. Manufacturer's Experience

1. The equipment manufacturer shall have not less than twenty-five (25) successful systems of the type specified in operation for a period of minimum 10 years. The engineer may require evidence in the form of operating records from these plants to substantiate any claims concerning the ability of the equipment to perform as required.

2. The blower system shall be as manufactured by United Blower, Inc.

located in Atlanta, Georgia, USA or equal.

1.2 SUBMITTALS

A. Submit in accordance with Section 01300.

B. Shop Drawings:

1. Show layout of all equipment; including layout and erection details for all blowers; include mounting details.

C. Certification:

1. Show characteristic curves for blower(s); including pressure and brake horsepower plotted against CFM capacity for full blower range. Clearly identify the design point specified.

D. Operating and Maintenance Manuals and Drawings:

1. Manufacturer submit ( 4) sets of operating and equipment maintenance instructions and detailed drawings in accordance with Section 01730.

1.3 EQUIPMENT

MANUFACTURER'S SERVICE REPRESENTATIVE

A. General

1. See Section 15000, MECHANICAL EQUIPMENT - GENERAL for complete requirements for the Manufacturer's Service Representative.

B. Equipment Startup

1. Provide for equipment startup of (1) eight (8) hour working day(s).

HBH Consulting Engineers, Inc. Page 3

C. Operating Instructions

1. Provide for one (1) eight (8) hour working day total to instruct Plant Operators on the equipment supplied. The training period will be integrated by the owner with overall training. Trainer shall have a minimum of 3 years experience in providing blower system training. A resume and/or training outline may be required at the owner’s discretion.

1.4 GUARANTEE AND WARRANTY

A. The equipment shall be unconditionally guaranteed for a period of (24) twenty four months from the date of shipment and must meet or exceed the design criteria detailed in Part 2 - PRODUCTS and Part 4 - DATA SHEET of this Specification.

B. See Section 15000, MECHANICAL EQUIPMENT - GENERAL, for other requirements.

PART 2 PRODUCTS

2.1 DESIGN CRITERIA

A. Blower shall be positive displacement rotary type with top inlet and bottom outlet.

B. Blower shall be V-belt driven by an electric motor.

C. All bearings shall be anti-friction type rated by AFBMA standards to have a minimum B10 life of 40,000 hours at design speed and maximum radial and thrust load conditions.

D. Operating conditions and blower characteristics are provided in PART 4 - DATA SHEET of this Specification.

E. All piping shall be so installed that no weight or strain will be imposed on the blower.

F. Design point noise levels for each blower furnished shall not exceed the dbA limits indicated on the Data Sheets in Part 4 of this specification. The dbA limits listed in Part 4 are expressed as measurements taken at a distance of three feet in any direction from the blower system or from the acoustical enclosure if it is provided. The engineer must state if the noise level specified is measured in the “ROOM” or in a “FREE FIELD”. With its submittals, the contractor shall provide the engineer with the manufacturer's certification of the design point dbA level for each blower system furnished.

2.2 DESCRIPTION OF EQUIPMENT

A. Blower

1. Housing

a. Casing shall be made of high-grade, close-grained grey cast iron, annealed for stress relief and ribbed to prevent distortion. The casing shall be of one- piece construction for positive bearing alignment, with separate head plates for easy access. Casing has screwed or flanged inlet and discharge connections.

HBH Consulting Engineers, Inc. Page 4

b. Both end plates shall be bolted and pinned to the casing. End plates as an integral part of the casing will not be acceptable. Bearing fits shall be precision machined to ensure accurate positioning of the rotors in the casing. Materials of construction shall be high grade, close grained grey cast iron.

c. Gear End covers shall be bolted to the end plates. Material of construction shall be high grade, close grained grey cast iron, or aluminum.

2. Rotors and Shaft

a. The rotors shall be of the straight, bi-lobe involute type and shall operate without rubbing, liquid seals or lubrication.

b. Each rotor and shaft shall be ductile iron, integrally cast, and shall be accurately machined and ground to tolerance. Then the complete rotor assembly shall be dynamically balanced.

3. Timing Gears

a. Both rotors shall be positively timed by a pair of accurately machined, heat treated ground alloy steel, spur tooth timing gears.

The timing gears shall be mounted on tapered shafts to provide positive locking of gears and shaft.

b. Connections shall be provided for a hydraulic pump for expansion to adjust and/or remove gears.

4. Bearings

a. Each blower shaft shall be supported by cylindrical roller or ball bearings sized for a minimum of 40,000 hrs. B-10 life.

b. Drive shaft bearing is sized for an overhung V-belt drive maximum continuous operating load.

c. The bearing housing shall have a retainer providing positive containment of the bearings. Ground gear spacers shall maintain permanent rotor clearances within the blower casing.

5. Seals and Lubrication

a. The blower shall incorporate an oversized gear end oil reservoir with an adequately sized sight glass.

b. The blower shall incorporate four (4) Viton lip-type oil seals in the head plate and one (1) drive shaft Viton lip-type oil seal. All shaft surfaces in contact with sealing membranes shall be polished to reduce seal wear and risk of leakage.

HBH Consulting Engineers, Inc. Page 5

c. The timing gears and the gear end bearings shall be splash oil lubricated from oil slingers mounted on the driven shaft and dipping in oil. The drive end bearings shall be grease lubricated.

B. Base

1. The blower, motor, inlet silencer, discharge silencer, valves and instruments shall be mounted on a common elevated structural steel base using ¼” steel plates to provide sufficient stiffness to prevent any flexing. Discharge silencers are to be integral to the base frame and sufficiently supported so as to prevent any undue stresses to the blower flanges.

2. If necessary, blower feet must be shimmed to eliminate any possible blower housing distortion.

3. Manufacturer of the blower system must provide proof that the base is designed such that the system is operating well outside its natural frequencies.

C. Drive System

1. Each blower shall be equipped with an electric motor of the type and horsepower listed in part 4 - Data Sheet.

2. Motor shall be sized to accept load at pressure relief valve pop pressure without exceeding rated FLA.

3. Each blower shall be driven by a multiple V-belt drive system with a 1.4 service factor over the motor horsepower. A two-part OSHA drive guard shall be provided for each blower. Guard shall have a quick removable front, without the use of tools.

2.3 ACCESSORIES

Each blower shall be furnished with the following accessory items:

A. Fleixible Connector

1. The use of flexible hose in Viton or silicon rubber is acceptable for 4” and smaller lines. Secure heavy duty stainless steel clamps at each end. Laying length shall be at least 6”.

2. Flex connectors shall be utilized on the discharge of the discharge silencer.

3. Should source air be piped to the blower package, provide a flex connector on the intake of the intake silencer to isolate vibration.

4. Temperature rating shall be 300°F continuous.

B. Expansion Joint (5” and above)

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1. Expansion joints with a single arch molded EPDM or Viton rubber, shall be used for line sizes 5” and larger. The locations of installation shall be as described above.

2. The expansion joints shall be as manufactured by API, or equal.

C. Intake Filter

1. Each blower shall be furnished with a dry type element inlet filter complete with weather hood for outside installation.

2. Filters for blowers shall have a ( 3 ) inch flanged connection, rated at (285)

CFM.

3. Intake filters shall be as manufactured by United Blower Inc. , or equal.

4. Total pressure drop through the filter shall not exceed ( 3 )”wc.

NOTES:

1. Inlet filters must be sized at least 150% of specified inlet air flow (see part 4) for clean environments and 200% for dusty environments.

D. Inlet Silencers

1. The inlet silencers shall be of heavy-duty, welded steel construction, two chamber type (if geartip speed is below 3300 fpm), two chamber-absorptive type (if geartip speed is above 3300 fpm), with flanged connections and side outlet. The silencers shall provide attenuation suitable for critical pitch line velocity applications.

2. The inlet silencers shall be capable of handling the design flow without exceeding a 7” wc pressure drop.

3. ANSI 125/150 lb connection sizes shall be suitable to match blower and specified pipe diameters.

4. Supports: Provide one, carbon steel, clamp-type support at one end of the silencer and rigidly mount other end to the blower inlet flange. Support shall eliminate any stress on the blower flange. Provide a second support for silencers 6” and larger such that removal of the blower will not necessitate removal of the silencer.

5. The silencers shall be manufactured by United Blower Inc., or equal.

E. Discharge Silencers

1. The discharge silencers shall be of heavy-duty, welded steel construction two chamber type (if gear tip speed is below 2700 fpm), three chamber-

HBH Consulting Engineers, Inc. Page 7 absorptive type (if gear tip speed is above 2700 fpm), with flanged connections and side inlet. The silencers shall provide attenuation suitable for critical pitch line velocity applications.

2. Maximum pressure drop shall be 6” wc.

3. ANSI 125/150 lb connection sizes shall be suitable to match blower and specified pipe diameters.

4. Supports: Discharge silencers are to be integral of the base frame.

5. The silencers shall be manufactured by United Blower Inc., or equal.

F. Pressure Relief Valves

1. Provide a weighted pressure relief valve installed after the discharge silencer. This valve is to be shop tested to relieve at 1 psig above specified pressure. Provide valve equivalent to United Blower Inc. or equal.

NOTE: The motor shall be sized to accept load at pressure relief valve pop pressure without exceeding rated FLA.

G. Check Valve

1. Provide wafer, cast iron body, double disc-type check valve for mounting on blower discharge piping. Furnish valve with nickel plated internals, stainless steel spring and hinge pin and EPDM seat material.

H. Discharge Butterfly Valve

1. Provide wafer body, resilient-seated, lever-operated, tight closing butterfly valve for positively isolating the blower from the discharge manifold piping.

Furnish valve with cast iron body, ductile iron disc, 416 SS valve stem and disc screws, EPDM seat; acetal stem bushing; Buna N O-ring and stem packing, and nickel plated nodular iron 10 position lock lever handle.

I. Vibration Isolation Pads

1. Provide (2) molded, synthetic rubber and cork, vibration isolation pads for each blower, sized to fit the structural steel base.

J. Inlet Vacuum Gauge

1. Provide a differential pressure gauge to indicate pressure drop through the air filter equal to Model 2010 by Dwyer Instruments, Inc. or equal.

a. Range: 0 to 20 inches water gauge.

b. Accuracy: 2% of full scale.

c. Dial: 4½” ; 120° scale; .20 WC minor divisions or cylinder style.

d. Mounting: Vertical.

HBH Consulting Engineers, Inc. Page 8

e. Construction: Die cast aluminum case; silicone rubber diaphragm;

calibrated range spring; samarium-cobalt magnet; heli of high magnetic permeability mounted in sapphire bearings; clear plastic cover with O-ring seal and zeroing screw; litho-printed scale; red-tipped pointer with rubber pointer stops. Cylindrical style also acceptable.

f. Mount Vacuum gauge as shown in the drawings.

K. Discharge Pressure Gauge

1. Provide a liquid filled pressure gauge equal to type 1008A manufactured by Ashcroft or equal.

a. Range: 0 to 15 psig.

b. Accuracy: 2% of full scale.

c. Dial: 4” diameter; 270° scale; heavy gauge aluminum with white background and black markings; 0.25 psig minor divisions.

d. Case: Stainless steel.

e. Ring: Stainless steel.

f. Movement: Stainless Steel

g. Bourdon Tube: Phosphor bronze, large bore tubing which is silver soldered to socket and tip.

h. Connection: Forged brass 1/4" NPT black connection.

i. Mount discharge pressure gauge as shown in the drawings.

L. Discharge Temperature Gauge

1. Provide a bimetal thermometer manufactured by Ashcroft or equal.

a. Range: 50 to 300°F Series EL discharge.

b. Accuracy: 1% full span.

c. Dial: 5" diameter; 270° scale; heavy gauge stainless steel with white background and black markings; 5°F minor divisions.

d. Case: Stainless steel.

e. Ring: Stainless steel.

HBH Consulting Engineers, Inc. Page 9

f. Movement: Stainless steel.

g. Actuating Element: Type 304 stainless steel, precision rolled, fully annealed tubing.

h. Compensation: Bimetal compensator to offset ambient temperature changes in case area.

Acoustical Foam Insulated Noise Enclosure

1. General

The acoustical enclosure shall be compatible with the rotary positive displacement blower furnished in this specification section and shall comprise a complete system.

Enclosure shall be constructed to easily accommodate service and maintenance functions without dismantling of the enclosure. The enclosure shall have a minimum of three removable wall access doors appropriately placed for viewing and maintenance purposes.

In addition, enclosure shall include a removable roof panel, which will permit removal of blower and/or the motor without removal of the enclosure.

Enclosure ventilation inlet shall be mounted directly inline with motor fan such as to allow ventilation for motor cooling.

Enclosure exhaust fan shall be located away from enclosure inlet vent to create cross ventilation within enclosure for equipment cooling.

When applicable, enclosure sub-frame shall be designed so that completed blower package is mounted to sub-frame and enclosure is installed over blower package and fastened to sub-frame mounts. Sub-frame shall also have four anchor bolt mounts and have provisions for easy lifting by fork lift.

2. Materials and Construction

The acoustical enclosure shall be as manufactured by United Blower, Inc.

A. Acoustical Panel Construction

1. All panels shall be constructed as follows:

Material: Galvanized G-90 steel, powered coated exterior. Outer skin: 18 GA. Thickness.

B. Acoustical insulation: each panel assembly shall be completely filled with polyester foam acoustical insulation with PSA backing. Acoustical insulation shall have the following physical properties:

Density (per ASTM D3574-856 test A) 4lb./c.f. 2 Thermal Conductivity (per ASTM C177) BTU/HR., Ft., °F/in. .25 Tensile Strength (per ASTM D3574-86 test E) 20 PSIG Heat Resistance (per ASTM D3574-86 test K) 70% after 22 hours day heat again@ 140°C

HBH Consulting Engineers, Inc. Page 10

Humidity Resistance (per ASTM D3574-86 test J) 70% after 6 hours steam autoclave @

Service Temperature -40°F to 275°F (325°F intermittent)

Flammability MVSS 302, UL-94 HFI, and FAR 25.853(b) Chemical Resistance, excellent for the following fluids: water, petroleum, solvents, and alkalis

C. Each panel shall have two lifting handles to ease removal and a minimum of four lift and twist fasteners to secure the removable panels in the frame fasteners shall be Zinc plated.

(Zinc is a compatible with aluminum, galvanized and carbon steel).

D. Frame: The frame rails shall be made of 2” square extruded aluminum with two 1” lips to be utilized as panel shoulders. The rails shall be connected together to create the outer shape of the enclosure with the use of cast aluminum end connectors. The end connectors shall have three protrusions that slide into each adjoining frame rail. Each protrusion shall have a polyurethane strip on one side to ensure a tight fit with the adjoining frame rail. The frame rails shall be secured in place to the end connectors with two low profile Tec screws.

E. Weather Hoods: The inlet ventilation and exhaust fan openings shall be covered with an acoustical foam insulated weather hood. The outer skin of the weather hood shall be made from the same material as the panel walls. In addition, the inner surface shall be lined with 2” acoustical foam in the same manner as the rest of the panels.

F. Sub-Frame (if applicable): Constructed with 3/16" steel base plate and four 3/8" anchor bolt mounting plates. Outer frame is made of 2" x 3" x 1/4" angle end members and 3" x 2" x 11 GA side members. Fork lift tubes are to be 6" x 3" x 11 GA and also serve as blower package mount. Cavities between outer members and fork lift tubes are filled with the same acoustical foam material used in enclosure walls. 2" x 2" x 1/4" angles are welded in each corner for mounting to enclosure frame. Top cavity of sub-frame is covered with an 11 GA galvanized steel oil drip pan.

3. Performance

Noise levels measured at three feet from the enclosure with one blower in operation using 1” foam lined panels, shall be reduced 5 to 7 dBA decibels on average (compared to same blower package with no noise enclosure). Noise levels should reduce 14-18 dBA at 3 feet when upgrading to 2” foam, as measured on the “A” scale of a standard sound level meter at slow response. For attenuation of 18-22 dBA at 3 feet, provide 2” mineral wool covered by a galvanized metal perforated cover. Noise levels are determined by octave band analysis, the equivalent A-weighted sound level shall be computed as set fourth in 29 CFR 190.95 (a).

4. Accessories

Provide enclosure cooling with a 120VAC high volume exhaust fan thermostatically controlled.

Fan shall be fed external 15 amp 120VAC power. The fan shall be protected with a solid state starter/breaker set at max 5 amps. Cooling shall limit the temperature rise in the enclosure to 20°F above ambient.

2.4 TESTING

A. Factory Testing

1. After assembly, blower system shall be factory lubricated, aligned and operationally tested. Run time on each blower shall be at least one hour after

HBH Consulting Engineers, Inc. Page 11 which each blower shall be rechecked for alignment and tension of V-belts and adjusted if necessary. If adjustments are made, the blower(s) shall be restarted and run an additional 15 minutes, shut down and rechecked again.

2. The blower supplier shall notify the Engineer at least (5) days before any testing occurs. The Engineer will notify the supplier within three days of such notice, if the engineer and/or owner wish to witness this operational run testing of the blower system.

3. A report on each blower system, signed by an officer of the company, shall be furnished with the O&M manuals giving as a minimum the following readings taken at/or near the end of the one hour run time:

- Amperage draw, per leg.

- Voltage draw, per leg.

- Pressure.

- Housing surface temperatures of motor bearings, blower bearings, and blower discharge air.

- Noise level in dbA measured at 3 ft from the blower system in (6) locations.

- Vibration levels in in/sec of blower and motor bearing housing in horizontal, vertical and axial direction and in (6) locations on the common base.

2.5 SHIPPING

A. All equipment supplied in this section, with the exception of instruments, check valves and butterfly valves, shall be assembled as one unit at the factory and shipped as one unit.

2.6 PAINTING

A. Shop paint assembly frame, blower, silencers, motor, and sliding motor base separately and then assemble using grade 5 zinc plated hardware.

1. Preparation:

Remove weld splatter; grind smooth sharp edges and welds, contour to rounded shape, and pressure (2000 psig) clean with grease/oil removing solvent.

2. Primer Coat:

Apply one coat at 3 to 4 mils DFT equivalent to Tnemec Series 37 Chem.

Prime.

3. Finish Coat:

Apply one coat of 2 to 3 mils DFT equivalent to Tnemec Series 73 Endura Shield III Polyurethane.

HBH Consulting Engineers, Inc. Page 12

4. Touch Up Paint:

Provide one can of finish coat paint for touch ups after installation of the blower package.

2.7 SPARE PARTS

A. The Contractor shall deliver the following spare parts for each blower system.

1. One ( 1 ) set of blower bearings.

2. One ( 1 ) set of blower gaskets and seals.

3. One ( 1 ) set of V-belts

4. One ( 1 ) set of filter elements for each blower supplied.

5. Sufficient oil for One ( 1 ) change for each blower.

All of the above parts shall be provided as spare parts and shall be packaged for potential long-term, dry storage.

PART 3 - EXECUTION

3.1 INSTALLATION

A. Equipment shall be installed in accordance with Section 15000 MECHANICAL

EQUIPMENT- GENERAL, and in accordance with the manufacturer's recommendations to provide a complete installation.

B. All piping shall be supported to prevent exerting undue forces and moments on the blower flanges. Single arch expansion joints shall be furnished to isolate the blower package from the piping system. All blowers with 8-inch diameter discharge flange or larger MUST have an expansion joint between blower flange and discharge silencer flange.

C. Each blower unit will be installed on a flat and level concrete pad, suitable for supporting the dead weight of the unit. Vibration isolation pads must always be placed between concrete pad and common base legs.

D. All piping and fittings to mount the specified instruments must be provided by the blower system manufacturer.

E. If required all blower oil drains must be piped away from the blower to easily drain oil.

F. The blower manufacturer will furnish the services of a factory-based engineer to check the installation of the blower system and make any field adjustments necessary to insure proper mechanical operation. The blower system manufacturer will submit, to the contractor, a written report certifying that the equipment has been satisfactorily installed and lubricated. See also item 1.4.

3.2 ELECTRICAL CONNECTIONS AND CONTROLS

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A. Electrical motor controls, instrumentation, power and instrumentation wiring and conduits will be provided by the Electrical Contractor under Division , ELECTRICAL.

PART 4 - DATA SHEET

4.1 DATA SHEET NO. 1

A. Number of Blower assemblies: (2) units.

B. Location: Wastewater Treatment Lagoons

C. Blower Characteristics:

1. Air Flow - (285) SCFM at 14.7 psia, 68°F, and 36% relative humidity.

2. Discharge Pressure - (4.6) psig

3. Local Conditions - (100) feet elevation, inlet air temp (100) °F and (60)% relative humidity.

4. Maximum Allowable Blower Gear Tip Speed

5. Maximum Design Brake Horsepower – (7.8) BHP

6. Maximum Average Noise Level (90) dbA measured at (6) locations at a distance of 3 ft. from the blower system. Noise level will be measured in a "free-field".

7. Drive Motor(s)

a. Designed, manufactured, and tested in accordance with the latest revised edition of NEMA MG-1. The motor shall be a squirrel cage induction type, single-speed, horizontally mounted. The motors shall conform to the following:

Synchronous Speed 1800 RPM

Voltage, Phase, & Frequency 460 volts, 3 phase, 60 Hz Insulation Class F

Enclosure TEFC

Service Factor 1.15

Duty Cycle Continuous

Ambient Temperature Rating 40 degrees C

Starting Method Full voltage, across the line

Bearing Lubrication Manufacturer's standard

Bearing Life 50,000 hours rating life as defined by AFBMA standards

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Nominal full load efficiency Meets NEMA Premium

Inverter Ready: Must meet NEMA MG1 Part 31for VFD applications

b. Accessories: (Space Heater) (Winding Temperature Detector)

8. Acceptable blower models are:

- United Blower Inc. model (UBI 407).

- OR Approved Equal

PART 5 – SPECIAL PROVISIONS

5.1 MEASUREMENT AND PAYMENT

A. Furnish materials and provide work in this Section as a portion of the lump sum price for the Attached Growth Systems as stated on the Bid Form. No separate payment will be made for work in this Section.

END OF SECTION

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EXISTING CHLORINE CONTACT

CHAMBER:500 LF OF 21-INCH PIPE

ENTEX FLOATING WAVTEX

MODULES FOR AMMONIA

TREATMENT OR PRE-APPROVED

EQUAL

LAGOON

CELL 1

LAGOON

CELL 2

3" FLOATING AIR LINE (ALFAGOMMA

FLOATING HOSE, TYPE T202AA) OR

APPROVED EQUAL

INSTALL CONCRETE POSTS TO

MOORE THE WAVTEX MODULES

INTO PLACE. SEE C14 FOR DETAIL.

50.6

50.0

5.0

3.0

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CHLORINATION BUILDING

ABANDONED INFLUENT STRUCTURE

DEMOLISH AND REMOVE TO ALLOW

VEHICLE ACCESS TO BLOWERS

10.0

7.5

MOORING

CABLES (TYP)

8.0

6" HDPE

HEADER

PIPE

INSTALL MOORING

CABLE POSTS (TYP). SEE

DETAIL ON SHEET C14

NOTE:

INSTALL 10HP VFD BLOWER CONTROL WITHIN NEMA 4

CABINET ON THE WESTERN EXTERIOR FACE OF THE

EXISTING CHLORINATION BUILDING. INSTALL SUN SHIELD

TO LIMIT SUN EXPOSURE.

INSTALL ECONO-TOP SERIES 10 HP POSITIVE DISPLACEMENT BLOWERS (ONE DUTY

AND ONE SPARE) OR APPROVED EQUAL. BLOWERS PROVIDED IN OUTDOOR RATED,

ACOUSTICAL ENCLOSURES. SEE C9 FOR DETAILS. LOCATE BLOWERS ON

APPROPRIATELY-SIZED CONCRETE PAD PER MANUFACTURE RECOMMENDATIONS.

SEE SHEET C12 FOR DETALS

Docusign Envelope ID: E59A6337-A45A-460D-ADBF-3D6A913B2032

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TILLAMOOK COUNTY, OR

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WWTP DECHLORINATION AND AMMONIA IMPROVEMENTS

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AMMONIA TREATMENT

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MCC

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ADDENDUM 4

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MCC

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ADDENDUM 1

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MCC

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ADD JAIL STEP SYSTEM AND PUMP STATION ABANDONMENT

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OREGON

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EXPIRES

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AMMONIA TREATMENT

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( IN FEET )

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GRAPHIC SCALE

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1. ALL NAMED BRANDS ARE INTENDED TO BE AN INDICATION OF SPECIFIED FUNCTION AND QUALITY. ALL ITEMS TO BE CONSIDERED "OR APPROVED EQUAL"

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ECONO-TOP SERIES BLOWER DETAIL

ACO MODEL: OT-45 SODIUM BISULFATE (SBS) TANK

EASYPRO 3 WATER SAMPLING STATION

NOTE:

Docusign Envelope ID: E59A6337-A45A-460D-ADBF-3D6A913B2032

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TILLAMOOK COUNTY, OR

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WWTP DECHLORINATION AND AMMONIA IMPROVEMENTS

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DETAILS 2

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MCC

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ADDENDUM 4

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MCC

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ADDENDUM 1

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1. ALL NAMED BRANDS ARE INTENDED TO BE AN INDICATION OF SPECIFIED FUNCTION AND QUALITY. ALL ITEMS TO BE CONSIDERED "OR APPROVED EQUAL"