B09_Amd_06_33_16_00_-_Water_Utility_Storage_Tank_0006.pdf

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WATER UTILITY STORAGE TANK

SECTION 33 16 00 - WATER UTILITY STORAGE TANK

PART 1 - GENERAL

1.1 SECTION INCLUDES

A. Furnish and erect a glass-fused-to-steel bolted water storage tank, including foundation, tank structure and tank appurtenances.

1.2 RELATED REQUIREMENTS

A. Section 33 14 16 – Site Water Utility Distribution

1.3 REFERENCE STANDARDS

A. ANSI/AWWA D103-97 – Factory-Coated Bolted Steel Tanks for Water Storage

B. ANSI/NSF 61 – Drinking Water System Components

1.4 SUBMITTALS

A. Product Data: Provide data on water storage tank and tank appurtenances.

B. Shop Drawings for water storage tank.

C. Structural calculations for tank structure and foundation.

D. Manufacturer’s Certificate: Certify that products meet or exceed specified requirements.

E. Tank manufacturer’s warranty.

F. Tank manufacturer’s standard Operation and Maintenance Manual.

PART 2 - PRODUCTS

2.1 PLATES AND SHEETS

A. All steel shall be smelted and produced in the United States of America.

B. Steel plates and sheets used in the construction of the tank shell, tank floor (when supplied) and tank roof, shall comply with the minimum standards of AWWA D103, latest edition.

C. Design requirements for mild strength steel shall be ASTM A1011 Grade 30 with a maximum allowable tensile stress of 14,566 psi (100 MPa).

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D. Design requirements for high strength steel shall be ASTM A1011 Grade 50 with a maximum allowable tensile stress of 26,000 psi (179 MPa).

E. The annealing effect created from the glass coated firing process shall be considered in determining ultimate steel strength. In no event shall a yield strength greater than 50,000 psi (345

MPa) be utilized for calculations detailed in AWWA D103, Sections 3.4 and 3.5.

F. When multiple vertical bolt line sheets and plates of ASTM A1011 Grade 50 are used, the effective net section area shall not be taken as greater than 85% of the gross area.

2.2 ROLLED STRUCTURAL SHAPES

A. Material shall conform to minimum standards of ASTM A36 or ASTM A992.

2.3 HORIZONTAL WIND STIFFNERS

A. Design requirements for intermediate horizontal wind stiffeners shall be of the "web truss" type with an extended tail creating multiple layers of stiffener, permitting wind loads to be distributed around the tank.

B. Web truss stiffeners shall be of steel with hot dipped galvanized coating.

C. Rolled steel angle stiffeners are not permitted for use as intermediate horizontal wind stiffeners.

2.4 BOLT FASTNERS

A. Bolts used in tank lap joints shall be ½" - 13 UNC- 2A rolled thread, and shall meet the minimum requirements of AWWA D103, Section 2.2.

B. Bolt Material

1. SAE J429 Grade 2 (1inch bolt length)

a. Tensile Strength - 74,000 psi Min.

b. Proof Load - 55,000 psi Min.

c. Allowable shear stress with threads excluded from the shear plane - 18,163 psi Min.

2. SAE J429 Grade 5 (1 ¼ inch bolt length)

a. Tensile Strength - 120,000 psi Min.

b. Proof Load - 85,000 psi Min.

c. Allowable shear stress with threads excluded from the shear plane – 29,454 psi Min.

3. SAE J429 Grade 8 (>1 ¼ inch bolt length)

a. Tensile Strength - 150,000 psi Min.

b. 3.4.2.3.2 Proof Load - 120,000 psi Min.

c. 3.4.2.3.3 Allowable shear stress with threads excluded from the shear plane – 36,818 psi Min.

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C. Bolt Finish - Zinc, mechanically deposited.

1. 2.0 mils Min. - under bolt head, on shank and threads.

D. Bolt Head Encapsulation

1. High impact polypropylene copolymer encapsulation of entire bolt head up to the splines on the shank.

2. Resin shall be stabilized with an ultraviolet light resistant material such that the color shall appear black.

3. The bolt head encapsulation shall be certified to meet the ANSI/NSF Standard 61 for indirect additives.

E. All bolts on the vertical tank wall shall be installed such that the head portion is located inside the tank, and the washer and nut are on the exterior.

F. All lap joint bolts shall be properly selected such that threaded portions of the bolts will not be exposed to the "shear plane" between tank sheets.

G. Bolt lengths shall be sized to achieve a neat and uniform appearance. Excessive threads extending beyond the nut after torquing will not be permitted.

H. All lap joint bolts shall include a minimum of 4 splines on the underside of the bolt head at the shank in order to resist rotation during torquing.

2.5 SEALANTS

A. The lap joint sealant shall be a one component, moisture cured, polyurethane compound. The sealant shall be suitable for contact with potable water and shall be certified to meet ANSI/NSF

Additives Standard 61 for indirect additives.

B. The sealant shall be used to seal lap joints and bolt connections and edge fillets for sheet notches and starter sheets. The sealant shall cure to a rubber-like consistency, have excellent adhesion to the glass coating, low shrinkage, and be suitable for interior and exterior use.

C. Sealant curing rate at 73°F (23°F ) and 50% RH.

1. Tack-free time: 6 to 8 hours.

2. Final cure time: 10 to 12 days.

D. Neoprene gaskets and tape type sealer shall not be used.

2.6 GLASS COATING

A. Surface Preparation

1. Sheets shall be steel grit-blasted on both sides to the equivalent of SSPC SP-10 (Near–

White Metal Blast Cleaning).

2. The surface anchor pattern shall be not less than 1.0 mil.

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B. Sheet Edges

1. After initial sheet preparation, all full height vertical wall sheets and all rectangular shaped floor sheet edges are round and glass coated. Sheet edges must be rounded by grinding to allow the glass to cover the sheet edge in the same matter as the flat portion of the sheet and per profile Porcelain Enameling Institute Technical Manual PEI-101 to enable the same glass coating to be applied to all four sides of the sheet and ensure full encapsulation of the sheet edges with a minimum thickness of 5 mils of vitrium glass coating.

C. Cleaning

1. After fabrication and prior to application of the coating system, all sheets shall be thoroughly cleaned by a caustic wash and hot rinse process followed immediately by hot air drying.

2. Inspection of the sheets shall be made for traces of foreign matter, soil particles, grease or rust.

D. Coating

1. A base coat of glass frit containing nickel oxide shall be applied to both side of the sheet.

2. A second coat of milled Pahoehoe brown glass shall be applied to both sides of the sheets.

3. A third coat of glass shall be applied to all interior sidewall and floor sheet surfaces which must be a titanium dioxide reinforced mixture, white glass. The specified coating shall be

Aquastore Vitrium. An acceptable alternate three coat system must be submitted for approval prior to the bid.

4. The same glass coating as applied to the exterior sheet surfaces shall be applied to the exposed edges.

5. The sheets shall then be fired at a minimum temperature of 1500° F (816° C) in strict accordance with the manufacturer's ISO 9001 quality control procedures, including firing time, furnace humidity, temperature control, etc.

6. The interior coating process for sidewall sheets and floor must be a 3 coat process. The interior color shall be white. The exterior color shall be Pahoehoe Brown.

7. The dry film interior coating thickness shall be 10.0 to 18.0 mils minimum.

8. The dry film exterior coating thickness shall be 7.0 to 15.0 mils minimum.

E. Factory Inspection

1. The manufacturer’s quality system shall be ISO 9001 certified and refer to ISO

(International Organization for Standardization) for the following testing and procedures.

2. Chemical Resistance of Glass Coating

a. Frits shall be individually tested in accordance with pertinent sections of ISO 28706-

1:2008.

3. Factory Holiday Test

a. A dry volt test using a minimum of 1100 volts is required.

b. Frequency of the test shall be every sheet. Any sheet registering a discontinuity on the interior surface or floor shall be rejected.

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4. Measurement of Glass Thickness

a. Glass thickness shall be measured using an electronic dry film thickness gage

(magnetic induction type) approved by CST Storage. The thickness gage shall have a valid calibration record.

b. The thickness of the glass shall be between 10.0 and 18.0 mils.

5. Measurement of Color

a. The exterior color of the sheets shall be measured using a colorimeter approved by

CST Storage. The colorimeter shall have a valid calibration record.

b. The color must fall within the tolerance specified by CST Storage, else the panel shall be rejected.

6. Impact Adherence Test

a. The adherence of the glass coating to the steel shall be tested in accordance with ISO standards. Any sheet that has poor adherence shall be rejected.

7. Fishscale Test

a. The glass coating shall be tested in-house for fishscale by placing the full size production sheets in an oven at 400º F for one hour. The sheets will then be examined for signs of fishscale. Any sheet exhibiting fishscale shall be rejected and all sheets from that gage lot will be similarly tested.

F. Packaging

1. All sheets that pass Factory Inspection and Quality Control checks shall be protected from damage prior to packing for shipment.

2. Heavy paper or plastic foam sheets shall be placed between each panel to eliminate sheet-to-sheet abrasion during shipment.

3. Individual stacks of panels will be wrapped in heavy mil plastic and steel banded to special wood pallets built to maintain the roll-radius of the tank panels and minimize contact or movement of finished panels during shipment.

4. Shipment from the factory will be by truck, hauling the tank components exclusively.

PART 3 - EXECUTION

3.1 FOUNDATION

A. The tank foundation is a part of this contract and shall be installed by the tank contractor.

B. The tank foundation shall be designed by the manufacturer to safely sustain the structure and its live loads.

C. Tank foundation design shall be based on the soil bearing capacity as determined by geotechnical analysis performed by a licensed soils engineer.

D. Embedded starter shall be 19” or 25” as determined by manufacturer.

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E. Slot Mount concrete footing is not acceptable.

3.2 TANK FLOOR

A. Glass Coated Bolted Steel Floor

1. Bolted steel panels shall be either placed over a 3 inch compacted sand base contained by a steel or concrete ring wall, or a non-extruding and resilient bituminous type filler meeting the requirements of ASTM D1751 if set on a concrete slab.

2. A plastic encapsulated nut shall be used to cover the bolt threads exposed on the inside of the floor. The plastic encapsulation shall be NSF compliant.

3. Leveling of the starter ring shall be required and the maximum differential elevation within the ring shall not exceed 1/8 inch, nor exceed 1/16 inch within any 10 feet of length.

B. Concrete Floor

1. The floor design is of reinforced concrete with an embedded glass coated steel starter sheet per the manufacturer's design and in accordance with AWWA D103 latest edition, Sec

11.4. Slot Mount style foundation is not acceptable.

2. Leveling of the starter ring shall be required and the maximum differential elevation within the ring shall not exceed 1/8 inch, nor exceed 1/16 inch within any 10 feet of length.

3. A leveling plate assembly consisting of two anchor rods and a slotted plate shall be used to secure the starter ring, prior to encasement in concrete. Installation of the starter ring on concrete blocks or bricks, using shims for adjustment, is not permitted.

4. Place one butyl rubber elastomer waterstop seal on the inside surface of the starter ring below concrete floor line. Place one bentonite impregnated water seal below the butyl rubber seal. The materials shall be installed in accordance with tank manufacturer's instructions.

3.3 SIDEWALL STRUCTURE

A. Field erection of the glass-coated, bolted-steel tank shall be in strict accordance with the procedures outlined in the manufacturer's erection manual, and performed by an authorized dealer of the tank manufacturer, regularly engaged in erection of these tanks, using factory trained erectors.

B. Specialized erection jacks and building equipment developed and manufactured by the tank manufacturer shall be used to erect the tanks.

C. Particular care shall be taken in handling and bolting of the tank panels, structural members, and appurtenances to avoid abrasion of the coating system. Prior to a liquid test, all surface areas shall be visually inspected by the CO.

D. An electrical leak test shall be performed during erection using a wet sponge 9 volt leak detection device. All electrical leak points found on the inside surface shall be repaired in accordance with manufacturer's published touch up procedure.

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E. No backfill shall be placed against the tank sidewall without prior written approval of the tank manufacturer. Any backfill allowed shall be placed according to the strict instructions of the tank manufacturer.

3.4 ROOF

A. Tanks with diameters of 14 to 31 feet shall include a radially sectioned roof fabricated from glass

- coated, bolted steel panels, as produced by the tank manufacturer, and shall be assembled in a similar manner as the sidewall panels utilizing the same sealant and bolting techniques, to assure a weather tight assembly. The roof shall be clear - span and self-supporting. Both live and dead loads shall be carried by the tank walls. The roof shall be of a rolled knuckle design, with no rolled angle connection between sidewall and roof panels. The manufacturer shall furnish a roof opening which shall be placed near the outside tank ladder and which shall be provided with a hinged cover and a hasp for locking. The opening shall have a clear dimension of at least 24 inches in one direction and 15 inches in the other direction. The opening shall have a curb at least

4 inches in height, and the cover shall have a downward overlap of at least 2 inches, or a gasketed weather-tight cover in lieu of the 4 inch curb and 2 inch overlap.

B. Roofs for tanks greater than 31 feet in diameter shall be constructed of non-corrugated triangular aluminum panels which are sealed and firmly clamped in an interlocking manner to a fully triangulated aluminum space truss system of wide flange extrusions, thus forming a dome structure.

1. The dome shall be clear span and designed to be self-supporting from the periphery structure with primary horizontal thrust contained by an integral tension ring.

2. The dome and tank shall be designed to act as an integral unit. The tank shall be designed to support an aluminum dome roof including all specified live loads.

3. Materials:

a. Triangulated dome frame struts: AA6005A-T6 aluminum.

b. Structural frame node plates: 0.375 inch nominal thickness, AA6061-T6 aluminum,

c. Triangular dome panels: 0.050 inch nominal thickness, AA3003-H16 aluminum

Sheet.

d. Triangular skylight panels, (if specified): nominal thickness of ¼ inch thick clear acrylic or polycarbonate.

e. Perimeter tension/compression ring: AA6005A-T6 aluminum.

f. Fasteners: AA2024-T4 aluminum or austenitic series 300 stainless steel as required by the manufacturers design.

g. Sealant: Silicone, conforming to Federal Specification TT-S-00230.

h. Gaskets: Silicone, conforming to Federal Specification ZZ-R-765, Class 2, Grade

50 or equal or Neoprene conforming to ASTM C509-00.

i. Dormers, doors, and hatches: AA6061-T6, AA6005A-T6,AA5086-H34 or AA5052-

H36 aluminum, 0.090inch nominal thickness.

4. Supplier shall be CST Covers of Lenexa, Kansas or approved equal.

C. Roof Vent

1. A properly sized vent assembly in accordance with AWWA D103 shall be furnished and installed above the maximum water level of sufficient capacity so that at maximum design

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rate of water fill or withdrawal, the resulting interior pressure or vacuum will not exceed

½ inch water column.

2. The overflow pipe shall not be considered to be a tank vent.

3. The vent shall be constructed of aluminum such that the hood can be unbolted and used as a secondary roof access.

4. The vent shall be so designed in construction as to prevent the entrance of birds and/or animals by including an expanded aluminum screen (½ inch) opening. An insect screen of

23 to 25 mesh polyester monofilament shall be provided and designed to open should the screen become plugged by ice formation.

3.5 APPURTENANCES

A. Pipe Connections

1. Where pipe connections are shown to pass through tank panels, they shall be field located, saw cut, (acetylene torch cutting or welding is not permitted), and utilize an interior and exterior flange assembly. Tank shell reinforcing shall comply with AWWA D103 latest edition. A single component urethane sealer shall be applied on any cut panel edges or bolt connections.

2. Overflow piping shall be four inches diameter schedule 80 PVC, seamless aluminum tubing, or FRP.

B. Outside Tank Ladder

1. An outside tank ladder shall be furnished and installed as shown on the submittal drawings.

2. Ladders shall be fabricated of aluminum and utilize grooved, skid-resistant rungs.

3. Safety cage and step-off platforms shall be fabricated of galvanized steel. Ladders shall be equipped with a hinged lockable entry device.

C. Access Doors

1. One bottom access door shall be provided as shown on the submittal drawings in accordance with AWWA D103.

2. The manhole opening shall be a minimum of 24 inches in diameter. The access door (shell manhole) and the tank shell reinforcing shall comply with AWWA D103 latest edition, Sec. 5.1.

D. Identification Plate

1. A manufacturer's nameplate shall list the tank serial number, tank diameter and height, and maximum design capacity. The nameplate shall be affixed to the tank exterior sidewall at a location approximately 5 feet from grade elevation in a position of unobstructed view.

E. Cathodic Protection

1. A passive cathodic protection system shall be designed and supplied by the tank manufacturer based upon information supplied by the CO.

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3.6 FIELD TESTING

A. Hydrostatic

1. Following completion of erection and cleaning of the tank, the structure shall be tested for liquid tightness by filling tank to its overflow elevation.

2. Any leaks disclosed by this test shall be corrected by the authorized dealer in accordance with the manufacturer's recommendations.

3. Water required for testing shall be furnished by the Owner at the time of tank erection completion, and at no charge to the tank erector. Disposal of test water shall be the responsibility of the Contractor.

3.7 DISINFECTION

A. Standards

1. The tank structure shall be disinfected at the time of testing by chlorination in accordance with AWWA Standard C652-02 "Disinfection of Water Storage Facilities" as modified by the tank manufacturer.

2. Disinfection shall not take place until tank sealant is fully cured.

3. Acceptable forms of chlorine for disinfection shall be:

a. Liquid chlorine as specified in AWWA C652-02.

b. Sodium hypochlorite as specified in AWWA C652-02.

4. Acceptable methods of chlorination shall be:

a. Chlorination method 1 as outlined in AWWA C652-02 Section 4.3.

b. Chlorination method 2 as outlined in AWWA C652-02 Section 4.3.

c. Chlorination method 3 as outlined in AWWA C652-02 Section 4.3.

5. Acceptable application methods shall be:

a. Chemical feed pump.

b. Spraying, brushing, or painting of all water-contact surfaces.

3.8 WARRANTY

A. The tank manufacturer shall include a warranty for the tank materials and coating. As a minimum, this warranty shall provide assurance against defects in material or workmanship for the period of 1 year and corrosion of the glass coated surface for the period of 5 years.

END OF SECTION 33 16 00