Attachment__12_Specification_Section_33_16_15_WATER_STORAGE_STEEL_TANKS_dated_15_Feb_17.pdf

Repair/Add IMC Fire Suppression System Final Design Construction Documents

DKFX 11-1005 A/B

SECTION 33 16 15

WATER STORAGE STEEL TANKS

02/17

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN SOCIETY OF CIVIL ENGINEERS (ASCE)

ASCE 7 (2010; Change 2010; Change 2011) Minimum

Design Loads for Buildings and Other

Structures

AMERICAN WATER WORKS ASSOCIATION (AWWA)

AWWA B300 (2010; Addenda 2011) Hypochlorites

AWWA B301 (2010) Liquid Chlorine

AWWA C104/A21.4 (2008; Errata 2010) Cement-Mortar Lining for Ductile-Iron Pipe and Fittings for

Water

AWWA C105/A21.5 (2010) Polyethylene Encasement for

Ductile-Iron Pipe Systems

AWWA C110/A21.10 (2008) Ductile-Iron and Gray-Iron Fittings for Water

AWWA C111/A21.11 (2007) Rubber-Gasket Joints for

Ductile-Iron Pressure Pipe and Fittings

AWWA C115/A21.15 (2005) Flanged Ductile-Iron Pipe With

Ductile-Iron or Gray-Iron Threaded Flanges

AWWA C150/A21.50 (2008) Thickness Design of Ductile-Iron

Pipe

AWWA C151/A21.51 (2009) Ductile-Iron Pipe, Centrifugally

Cast, for Water

AWWA C500 (2009) Metal-Seated Gate Valves for Water

Supply Service

AWWA C504 (2010) Standard for Rubber-Seated

Butterfly Valves

AWWA C508 (2009) Swing-Check Valves for Waterworks

Service, 2 In. (50 mm) Through 24 In. (600

mm) NPS

Attachment #12 FA4418-17-R-0003

DKFX 11-1005 A/B

AWWA C600 (2010) Installation of Ductile-Iron Water

Mains and Their Appurtenances

AWWA C652 (2002) Disinfection of Water-Storage

Facilities

AWWA D100 (2011) Welded Steel Tanks for Water Storage

AWWA D103 (2009; Errata 2010) Factory-Coated Bolted

Steel Tanks for Water Storage

AMERICAN WELDING SOCIETY (AWS)

AWS D1.1/D1.1M (2012; Errata 2011) Structural Welding

Code - Steel

ASME INTERNATIONAL (ASME)

ASME B16.3 (2011) Malleable Iron Threaded Fittings, Classes 150 and 300

ASME B40.100 (2005) Pressure Gauges and Gauge

Attachments

ASTM INTERNATIONAL (ASTM)

ASTM A197/A197M (2000; R 2006) Standard Specification for

Cupola Malleable Iron

ASTM A320/A320M (2011a) Standard Specification for

Alloy/Steel and Stainless Steel Bolting

Materials for Low-Temperature Service

ASTM A48/A48M (2003; R 2008) Standard Specification for

Gray Iron Castings

ASTM A53/A53M (2010) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS

INDUSTRY (MSS)

MSS SP-80 (2008) Bronze Gate, Globe, Angle and Check

Valves

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 780 (2011) Standard for the Installation of

Lightning Protection Systems

NSF INTERNATIONAL (NSF)

NSF/ANSI 61 (2010a) Drinking Water System Components -

Health Effects

THE SOCIETY FOR PROTECTIVE COATINGS (SSPC)

SSPC PS 4.04 (1982; E 2004) Four-Coat White or Colored

DKFX 11-1005 A/B

Vinyl Painting System (For Fresh Water, Chemical, and Corrosive Atmospheres)

SSPC PS Guide 17.00 (1982; E 2004) Guide for Selecting

Urethane Painting Systems

SSPC Paint 104 (1982; E 2004) White or Tinted Alkyd Paint

SSPC Paint 21 (1982; E 2004) White or Colored Silicone

Alkyd Paint (Type I, High Gloss and Type

II, Medium Gloss)

SSPC Paint 25 (1997; E 2004) Zinc Oxide, Alkyd, Linseed

Oil Primer for Use Over Hand Cleaned

Steel, Type I and Type II

SSPC AB 3 (2003; E 2004) Ferrous Metallic Abrasive

SSPC Guide 6 (2015) Guide for Containing Surface

Preparation Debris Generated During Paint

Removal Operations

SSPC SP 10/NACE No. 2 (2007) Near-White Blast Cleaning

U.S. DEPARTMENT OF DEFENSE (DOD)

MIL-DTL-24441 (2009; Rev D) Paint, Epoxy-Polyamide, General Specification for

MIL-DTL-24441/19 (2009; Rev C) Paint, Epoxy-Polyamide, Zinc

Primer, Formula 159, Type III

MIL-DTL-24441/20 (2009; Rev B) Paint, Epoxy-Polyamide, Green Primer, Formula 150, Type III

MIL-PRF-23236 (2009; Rev D) Coating Systems for Ship

Structures

MIL-PRF-6855-F Class 2, Oil Resistant Grade 50

Neoprene-1/4" thick

UFC 3-310-04 (2007; Change 1) Seismic Design for

Buildings

U.S. FEDERAL AVIATION ADMINISTRATION (FAA)

FAA AC 150/5345-43 (2006; Rev F) Specification for

Obstruction Lighting Equipment

1.2 SYSTEM DESCRIPTION

Submit certification by an independent third-party organization that all interior coating and materials that come in contact with the potable water comply with NSF/ANSI 61. Submit a certificate signed by a registered professional engineer, providing the following information:

a. Description of the structural design loading conditions used for the design of entire tank including the foundation as well as the structural design method and codes used in establishing the allowable

DKFX 11-1005 A/B

stresses applied in the design.

b. A statement verifying that the safety features, including ladder, perimeter guardrail and hand rail on top of each tank have been checked by an experienced safety engineer specializing in OSHA, state and local safety regulations.

c. A statement verifying that the detail drawings have been checked by experienced engineers specializing in hydraulic structures to determine that they agree with the design calculations in member sizes, dimensions, and fabricating process as prescribed by applicable

ACI and AWWA standards.

1.2.1 Design and Construction Standards

The design, fabrication, and erection of the reservoir shall be in accordance with the applicable requirements of AWWA D100 or AWWA D103 except as modified herein. Earthquake design shall be in accordance with

UFC 3-310-04 and ASCE 7-05 for seismic parameters. Submit Design Analyses and Calculations. Structural stiffening is to be welded to the interior of each tank to maintain roundness when the tank is subjected to wind and seismic loads." Fourth sentence: after "required" add: "however, 1/8 inch thick sheet steel additional thickness for structural strength, not less than 6 linear inches around each hole through the tank wall, is required. No additional thickness for corrosion allowance will be required. Design metal temperature shall be 195 degrees F. The reservoir shall be designed for a peak wind speed of 125 mph and live roof of 20 psf.

1.2.2 Welding

Qualification of welding procedures, welders, and welding operators shall be in accordance with Section 8.2 of AWWA D100, AWS D1.1/D1.1M and UFGS 05

51 33 METAL LADDERS. Radiographs shall be taken after assembly of the tank on all four sides of each plate and documented in a report. Report shall be submitted to the Contracting Officer and shall include a layout or sketch indicating the locations of radiographs with respect to edge of each plate and the inspector's acceptance record for each radiograph. All weld defects shall be repaired.

1.2.3 Welded Steel Reservoir or Tank

The reservoir shall have a storage capacity of 150,000 gallons. The reservoir shall have shell height and diameter as will meet the requirements for the 150,000 gallon capacity. The reservoir shall be of welded construction and have a watertight, domed roof, with no openings except properly constructed vents, manholes, hand holes, overflows, risers, drains, and fittings for cathodic protection equipment, water level indicating devices, and the like.

1.2.4 Sizing of Reservoir

Section 6 of AWWA D100 or Section 4 of AWWA D103.

1.2.5 Tank Coating

The Contractor that performs surface preparation or painting applications must be certified to either ISO 9001 or SSPC QF 1 and AAPC QS 1 prior to contract award and remain certified while accomplishing all surface preparation or coating applications. All primer, intermediate coat and

DKFX 11-1005 A/B

topcoat materials shall be supplied by one supplier, delivered in unopened containers with unbroken seals and labels showing designated name, specification number, color, directions for use, manufacturer name, date of manufacture, all legible and intact at time of use. All tank interior and exterior surfaces and surface mounted items detachable by removal of fasteners, such as hinges, walkways, screws and bolts shall be prepared to accept/hold paint by abrading to near white metal. Final depth of anchor profile shall be 2-4 mils. Spot blast or wire brush any joints or crevices or hard to reach surfaces to create near white metal. (Contractor shall install a "hold-primer" on all near white metal surfaces, in order to prevent flash rust from forming prior to painting.) Joints or crevices in tank surface shall be filled with joint sealant material (TT-S-00230, Type

II, Class B or equal) designed for joints or crevices in a steel tank surface. Ensure joint sealant material has cured prior to painting.

1.2.5.1 Coating Method

No open spray painting, including airless and dry fall methods are allowed. Apply paint with rollers, brushes or use a complete containment system that does not allow airborne paint particles out of the containment. Painting the interior of the tank is painting in a confined space and all the precautions and equipment necessary for painting in a confined space shall be followed by the contractor, specifically AF STD

9125.

1.2.5.2 Coating Specifications

Apply surface coatings when the tank steel temperature is between 50 and

140 degrees Fahrenheit. The prime coat shall be epoxy polyamide, MIL-DTL-24441/19 (Formula 159, Type III). The intermediate coat shall be epoxy polyamide, MIL-DTL-24441/31 (Formula 152, Type IV, white, tinted to

FED STD 595, color number 27778. The topcoat shall be MIL-PRF-85285, Type

II, gloss beige FED STD 595 color number 27769. Paint defects such as runs, drips, sags, holidays or over sprays shall be repaired. Coating materials for all interior tank surfaces that will be in normal contact with fire suppression water shall conform to NSF/ANSI 61. Certification shall be provided by an independent third-party organization that all interior coatings and materials, that come in contact with fire suppression water comply with NSF/ANSI 61.

1.2.5.3 Tank Bottom and Tank Chime

In addition to the above surface coating, the bottom of the tank and the tank chime shall be coated with self-adhering, self healing gelatinous anti-corrosion coating (Polyguard ReactiveGel or equivilant in gel or spray form). Gaps up to ¼ inch may be filled with 2 component urethane caulking.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL

PROCEDURES:

SD-02 Shop Drawings

Tank Installation; G

SD-03 Product Data

DKFX 11-1005 A/B

System Description

Foundations

SD-06 Test Reports

Tank Installation

Testing of Valves and Piping

SD-07 Certificates

System Description

Foundations

1.4 DELIVERY, STORAGE, AND HANDLING

Deliver paint in unopened containers with unbroken seals and labels showing designated name, specification number, color, directions for use, manufacturer, and date of manufacture, legible and intact at time of use.

Handle and store water storage tank systems, components, and parts to prevent distortions and other damage that could affect their structural, mechanical, or electrical integrity. Replace damaged items that cannot be restored to original condition. Store items subject to deterioration by exposure to elements, in a well-drained location, protected from weather, and accessible for inspection and handling.

PART 2 PRODUCTS

2.1 MATERIALS

Provide materials conforming to the following requirements:

2.1.1 Steel

Section 2 of AWWA D100 or Section 2 of AWWA D103.

2.1.2 Shop Fabrication

Section 9 of AWWA D100 or Section 7 of AWWA D103.

2.1.3 Ductile-Iron Pipe

Pipe for fluid conductors, except for overflow pipe, shall be ductile-iron pipe and shall be either of the following:

2.1.3.1 Bell-and-Plain End Pipe

AWWA C150/A21.50 and AWWA C151/A21.51, for not less than 150 psi working pressure, unless otherwise shown or specified. Joints shall be push-on or mechanical-joint conforming to AWWA C111/A21.11. Pipe shall be cement mortar lined in accordance with AWWA C104/A21.4. Linings shall be standard thickness.

2.1.3.2 Flanged Pipe

Flanged pipes shall conform to the applicable portions of AWWA C110/A21.10, AWWA C115/A21.15 and AWWA C151/A21.51, for not less than 150 psi working pressure, unless otherwise shown or specified. Pipe shall have flanged ends in accordance with AWWA C115/A21.15. Pipe shall be cement mortar

DKFX 11-1005 A/B

lined in accordance with AWWA C104/A21.4. Linings shall be standard thickness.

2.1.4 Specials and Fittings (except for overflow pipe)

2.1.4.1 Ductile-Iron with Bell-and-Plain End

AWWA C110/A21.10 and AWWA C151/A21.51 for not less than 150 psi working pressure, unless otherwise shown or specified. Specials and fittings shall be cement mortar lined in accordance with AWWA C104/A21.4. Linings shall be standard thickness.

2.1.4.2 Ductile-Iron with Flanged Ends

AWWA C110/A21.10 and AWWA C151/A21.51 for not less than 150 psi working pressure unless otherwise shown or specified. Fittings shall have flanged ends in accordance with AWWA C110/A21.10. Specials and fittings shall be cement mortar lined in accordance with AWWA C104/A21.4. Linings shall be standard thickness.

2.1.4.3 Fittings for Screw-Joint Pipe

Malleable-iron, galvanized, 150 psi, ASTM A197/A197M, threaded ends, ASME B16.3.

2.1.4.4 Joints Inside Valve Chamber

All joints inside the valve chamber shall be flanged.

2.1.4.5 Cathodic Protection

After painting, each tank shall be provided with all fittings and components for a cathodic protection system including a direct current power source, a long life anode and wiring between the power source and the anode and wiring between the tank wall and the anode. Provide four (4) equally spaced grounding lugs welded to base of tank on the chime.

2.1.5 Valves

2.1.5.1 Gate Valves

Gate valves shall be opened by turning counterclockwise. Valves 3 inches and larger shall be iron body, brass mounted, conforming to AWWA C500.

Valves smaller than 3 inches shall be all bronze and shall conform to

MSS SP-80, Type 1, class 150. Valves 3 inches or larger located in valve chambers shall be equipped with hand-operating wheels and shall be flanged.

2.1.5.2 Butterfly Valves

Butterfly valves shall be opened by turning counterclockwise. Valves shall conform to AWWA C504. Body and disc shall be cast iron, conforming to

ASTM A48/A48M. Shaft shall be 18-8 stainless steel. Resilient seat shall be bonded to the valve body. Butterfly valves shall be stainless steel to rubber seated, tight closing type.

2.1.5.3 Check Valves

Check valves shall be of the horizontal swing-check type, suitable for the purpose and the operating conditions. The body shall be iron and shall

Repair/Add IMC Fire Suppression System DKFX 11-1005 A/B have a removable gate assembly and a cover removable for inspection. The gate, gate seat, shaft, gate studs, and nuts shall be bronze or other suitable alloy. Valves shall conform to AWWA C508.

2.1.6 Pressure Gauge

Pressure gauge of the direct-reading type, equipped with a shutoff cock, shall be provided, in the valve chamber, on the tank side and on the discharge side of the check or altitude valve. Gauges shall have 6 inch dials, shall be stem mounted, and shall conform to ASME B40.100. Accuracy of gauges shall be Grade A or better. Gauges shall be calibrated in psi in not more than 2 psi increments from 0 to 50 psi in excess of the normal operating pressure at the tank.

2.1.7 Water Level Indicator

Contractor to provide a water level indicator reporting to the Fire Pump monitoring system.

2.1.8 Lightning Resistance

Tank to be constructed per NFPA 780, Chapters 3 and 4 so as to receive a lightning strike without damage.

2.2 ASSEMBLIES

2.2.1 Tank Accessories

Section 7 of AWWA D100 or Section 5 of AWWA D103 and as specified.

Additional requirements for accessories are as follows:

2.2.1.1 Pipe Connections

Section 7 of AWWA D100 and Section 5 of AWWA D103 represent the minimum requirements. Inlet pipe connections to extend 12 inches above tank bottom and shall be provided with deflectors. Outlet pipe connections to extend

24" above tank bottom and shall be provided with vortex breakers.

2.2.1.2 Overflow

The overflow for the tank shall consist of an overflow weir and outside drop pipe, adequately supported. The overflow pipe shall be steel, ASTM A53/A53M or equal, and shall terminate 1 to 2 feet above grade and shall be fitted with a flapper valve or screen to prevent ingress of animals and insects.

2.2.1.3 Vent

The vent shall be welded to the tank roof near the apex. Vent will be tank manufacturer's standard type mushroom vent with aluminum bird screen. The free area of the vent shall be sized 50 percent in excess of the pump-in rate and pump-out rate. Screening for vent shall conform to Section 5.7.2 of AWWA D100 or Section 5.7.2 of AWWA D103 which ensures fail-safe operation in the event that screen frosts over and the bottom of the screen shall be sufficiently elevated for snow consideration in the area.

2.2.1.4 Ladders and Safety Devices

Ladders and safety devices shall be provided in accordance with Sections

Repair/Add IMC Fire Suppression System

DKFX 11-1005 A/B

7.4 and 7.5 of AWWA D100 or Sections 5.4 and 5.5 of AWWA D103. Sections 7.4 and 7.5 of AWWA D100 and Sections 5.4 and 5.5 of AWWA D103 represent the minimum requirement. In addition, safety cage, rest platforms, roof ladder handrails, and other safety devices shall be provided as required by federal or local laws or regulations. The ladder for each tank shall be oriented or installed so that the ladders are located in close proximity to each other, to allow maintenance technicians easy access to either tank.

2.2.1.4.1 Guardrail Around Top Of Each Tank

A 42 inch high guardrail shall be installed completely around the perimeter of each tank dome, constructed of 1.5 inch diameter steel pipe, an intermediate guardrail at 21 inches high, with a 4 1/2 inch high steel toe-board, with removable, 1/4 inch thick steel raised diamond plate

(non-slip surface) steps, having an opening at the ladder, allowing easy access from the ladder to the tank dome. The removable steps and step supports are to be designed so as not to include pockets or depressions for rain to accumulate, to allow the steps to be quickly/easily removed for painting, and meet all safety requirements. The guardrail is to withstand

200 pounds load applied in any direction and comply with OSHA 29 CFR

1910.27 and all federal, state and local regulations. All bolts, hasps, or hinges shall be ASTM A320/A320M (Type 304 stainless steel).

2.2.1.5 Scaffold Cable Support

Provision shall be made for the attachment of a scaffold cable support at the top of the roof on welded tanks.

2.2.1.6 Roof Walkway

Install a 24" wide steel walkway extending from the ladder completely across the dome or top of the tank. The sides of the walkway are to have a

42" high handrail constructed of 1.5 inch diameter steel pipe, have an intermediate handrail at 21 inches high, with 4 1/2 inch high toe-board, and with removable, 1/4 inch thick steel raised diamond plate (non-slip surface) steps. The roof walkway is to extend between the two manholes, so that each manhole is within easy reach of the roof walkway. A 36 inch wide opening is to be provided in each side of the handrail, one opening adjacent to each manhole. The roof walkway is to be designed and constructed so as not to have pockets or depressions for rain to accumulate and to allow steps to be quickly and easily removed for painting, and meet all safety requirements. The handrail is to withstand 200 pounds load applied in any direction and comply with OSHA 29 CFR 1910.27 and all federal, state and local regulations. Construction of the roof walkway shall meet AWWA, OSHA, Federal, State and local base requirements and this specification. All bolts, hasps or hinges shall be ASTM A320/A320M (Type

304 stainless steel).

2.2.1.6.1 Manholes In Top Of Each Tank

Each of the two manholes are to be 36" in diameter, and located, one on each side of and adjacent to the walkway, one manhole at 45 degrees and one at 225 degrees (as viewed from the top of the tank, with the ladder at 180 degrees). Each manhole is to have a hinged cover, gasketed (conforming to

MIL-PRF-6855), lockable, with the hinge located on the side toward the ladder. All manhole bolts, hasps hinges shall be ASTM A320/A320M (Type 304 stainless steel).

Repair/Add IMC Fire Suppression System

2.2.1.6.2 Hand Holes In Top Of Tank

Adjacent to each of the two openings in the handrail (on the opposite side from each manhole), install two 6" diameter hand holes, one at 12" directly out from the walkway, and one at 72" directly out from the walkway, each hand hole is to have a hinged cover, gasketed (gasket conforming to

MIL-PRF-6855), lockable, with the hinge located on the side towards the ladder. All hand hole bolts, hasps, hinges shall be ASTM A320/A320M (Type

304 stainless steel).

2.2.1.7 Coating for Welded Tanks

Prepare and paint two (2) new 150,000 gallon Fire Suppression Water Tank assemblies:-interior, exterior, manholes, access ladder, all fittings for cathodic protection, water level indicator, roof walkway, as well as tank chime and tank bottom (interior and exterior).

2.2.2 Anchors for Reservoirs

The following requirements shall be met:

a. An adequate number of anchors designed to prevent overturning of the reservoir when empty shall be installed. If anchor bolts are used, the nominal diameter shall not be less than one inch, plus a corrosion allowance of at least 1/4 inch on the diameter. If anchor straps are used, they shall be pre-tensioned before welding to the tank shell.

b. The anchor bolts shall be a right angle bend, hook, or plate washer, while anchor straps shall have only a plate welded to the bottom. The anchors shall be inserted into the foundation to resist the computed uplift.

c. Attachment of anchors to the shell shall not add significant localized stresses to the shell. The method of attachment shall consider the effects of deflection and rotation of the tank shell.

Anchors shall not be attached to the tank bottom. Attachment of the anchor bolts to the shell shall be through stiffened chair-type assemblies or anchor rings of adequate size and height.

2.3 CONCRETE WORK

Concrete work shall conform to Section 03 30 53 MISCELLANEOUS CAST-IN-PLACE

CONCRETE.

2.4 CHLORINE

AWWA B300 for hypochlorites or AWWA B301 for liquid chlorine, mixed with water to give the solutions required in AWWA C652.

PART 3 EXECUTION

3.1 FOUNDATIONS

Foundations for the welded steel fire suppression water tank shall be constructed of concrete; reinforced, and designed in accordance with

Section 12 of AWWA D100 or Sections 11 and 8.5 of AWWA D103 and constructed in conformance with the applicable requirements of Section 03 30 53

MISCELLANEOUS CAST-IN-PLACE CONCRETE, except as shown or specified herein.

Repair/Add IMC Fire Suppression System

An AWWA D100 Type 1 or an AWWA D103 Type 1 or Type 2 foundation shall be provided for the reservoir. Factor of safety on overturning of reservoir under design wind load shall be 1.33 minimum. The 4" thick, concrete base provided for each tank is to have the outer 12" of the base diameter tapered up to 6" thick at the periphery, to provide overturning stability.

3.1.1 Earthquake Drains

In accordance with Specification 00 31 36,(the February 20, 2012 letter, second paragraph, 10th sentence), install eight (8) ten inch diameter earthquake drains in the tank foundation, spaced 45 degrees apart, located on a 14' diameter circle, to be installed after the concrete pilings. Each earthquake drain is to be drilled 20 foot deep into the tank foundation, a drain pipe inserted into the hole, the pipe filled with open graded number

4 stone per SCDOT Standard Specifications. Falling weight impact hammers or water jetting are not to be used to form the hole for each earthquake drain. The pipe installed in each earthquake drain is to have slot type perforations, and an annular corrugated interior and exterior, meeting the requirements of ASTM F-405, SCS 806, ASTM D3350 Cell Class 324420C, ASTM

D1248 Type III, Class C, Category 4, Grade P33. Splices in the pipe are to be made so as to maintain concentricity and continuity of the pipe.

Earthquake drain locations are to be numbered and recorded on the as built drawings. Each earthquake drain provides a drainage path for excess pore water pressure deep within the tank foundation.

3.1.2 Drain Pipes

Install four (4), three inch diameter drain pipes under each tank, extending from near the center of the tank bottom (90 degrees apart) out through the concrete foundation ring wall, to allow any surface water accumulation beneath the tank to escape by gravity. Install mastic seal caulk around each pipe extending through the concrete foundation ring wall.

Each drain pipe to be fitted with a flapper valve or screen to prevent ingress of animals and insects.

3.2 EXCAVATING, FILLING, AND GRADING

Excavating, filling, and grading shall conform to the applicable requirements of Section 31 23 00.00 20 EXCAVATION AND FILL.

3.3 TANK INSTALLATION

Submit detail and erection drawings, before proceeding with any fabrication. Complete drawings with details of steel, pipe, and concrete work, and of the assembling of items required for the total installation.

Use standard welding symbols as recommended by the American Welding

Society. Details of welded joints referenced on the drawings shall be included. Tank installation shall be in accordance with the following requirements:

3.3.1 Welding

Section 8 of AWWA D100 or Section 6 of AWWA D103.

3.3.2 Erection

Section 10 of AWWA D100 or Section 8 of AWWA D103.

Repair/Add IMC Fire Suppression System

3.3.3 Inspections and Testing

Tank inspection and testing shall be in accordance with Section 11 of

AWWA D100 or Section 9 of AWWA D103. Mill and shop inspections are not required. Perform the radiographic inspections of the welded tank shell, the hydrostatic test and the vacuum box leak test of the tank bottom. No leaks are permitted. Potable water will be provided by JB CHS at the base's expense for hydrostatic testing of each of the two 150K gallon water storage tanks. Arrangements for an acceptable time to draw water for this purpose is to be coordinated with the JB CHS Fire Services Department (ph:

843-963-3777). After the hydrostatic test has been completed, the contractor is to test the water to ensure it has not been contaminated, if not, then the water may be discharged into the storm drainage system at a flow rate not to exceed 5 feet per second, so as not create erosive velocities at the system discharge. Final hydrostatic and leak tests shall be performed before painting of welded tanks.

3.4 PIPING INSTALLATION (EXCEPT FOR OVERFLOW PIPING)

3.4.1 General Guidelines

Where details of fabrication or installation are not shown on the drawings, installation shall conform to Section 1 and 3 of AWWA C600.

3.4.2 Testing of Valves and Piping

After the reservoir has been erected and the valves and piping installed, and before field painting is begun, the valves and piping shall be hydrostatically tested in accordance with Section 4 of AWWA C600. Submit each coating manufacturer's technical data, application instructions, Material Safety Data Sheets (MSDS), and certificate for compliance for VOC content. Submit copies of the following test results:

a. Manufacturer's mill test reports for plate material.

b. Mill and shop inspections by a commercial inspection agency.

c. After acceptance of the structure, the radiographic film and test segments.

d. At the conclusion of the work, a written report prepared by the Contractor covering the hydrostatic test and certifying that the work was inspected in accordance with Section 11.2.1 of

AWWA D100.

Replace with sound material any defective material disclosed by the pressure test; the test shall be repeated until the test results are satisfactory.

3.4.3 Polyethylene Encasement of Underground Ductile-Iron Piping

Polyethylene encasement of underground ductile-iron piping shall be provided in addition to asphaltic coating in accordance with AWWA C105/A21.5.

3.4.4 Plugging Ends

Pipe ends left for future connections shall be capped or plugged as directed.

Repair/Add IMC Fire Suppression System

3.5 PREPARATION OF TANK WELDS

All sharp exterior steel edges, as well as deep/sharp interior corners/crevasses on the entire tank assembly and tank attachments, shall be worked to a rounded radius of not less than 1/8 inch. Smooth off any weld irregularities, weld spatter and sharp exterior edges (using a grinder or equivalent) then spot blast the weld irregularities, interior corners and crevasses. If deep/sharp interior corners/crevasses require additional material to comply with the rounded radius of 1/8 inch, weld material shall be added.

3.5.1 Thoroughly Clean Tank Surfaces

Remove oil, grease, dirt, oose particles and any other foreign material from the steel tank surfaces interior and exterior, roof walkway, manholes, access ladder, cathodic protection and water level indicator fittings as well as tank chime and inside/outside surfaces of tank bottom (per

SSPC-SP10 ISO8501-1 Sa 2.5).

3.5.2 Abrasive Blasting

Abrasive-blast all surfaces (including all welds) interior and exterior, to near white metal by using a mixture of water, abrasive and rust inhibitor using the Farrow System www.farrowsystem.com; or equivalent). Final profile in all steel surfaces shall be 2-4 mils anchor depth to allow complete adhesion of coating to the steel surface. Note that high pressure water jetting, sanding or grinding will not create the 2-4 mil deep sharp angular surface profile anchor in the steel surface that is necessary for proper adhesion of the coating. The contractor shall document (by taking photos, testing, recording results of daily samples) that the abrasive blast material is free of arsenic, beryllium, cadmim, cobalt, lead, mercury, rhodium, silver, tellurium, thallium, uranium or contamination as a result of improper handling.

3.5.3 Capture Blast Material

Contractor shall completely capture the abrasive material, water, dust, paint/rust particles and all material generated during the abrasive blasting procedure. Contractor is responsible for documenting the handling, storage, testing and disposal of all material collected.

3.5.4 Surface Coating

All surface coatings applied to the tank (Universal Amine Epoxy Coating PPG

AMERCOAT 240 having dry film thickness of 4-12 mils, or equal) shall be from the same manufacturer and shall be designed for use together for application on a steel tank. Paint defects such as runs, drips, sags, holidays or over sprays shall be repaired. Apply all coatings with rollers, brushes or a method that does not create airborne paint particles. No spray painting (including airless and dry fall methods) is allowed. Apply surface coatings when the tank steel temperature is between

50 and 140 degrees Fahrenheit. Color of final exterior coat shall be Air

Force Beige (Federal Std 595-37769).

3.5.5 Tank Bottom/Tank Chime

After application and curing of the surface coatings (per paragraph 3.5.1.2 above), the bottom exterior of the tank shall be buttered with self-adhering, self healing gelatinous anti-corrosion coating (Polyguard

Repair/Add IMC Fire Suppression System

Reactive Gel or equivalent) to provide long term corrosion protection for the tank bottom that is to be in continuous contact with the reinforced concrete foundation. After the tank is secured to the concrete foundation, gaps between the periphery of the tank bottom/chime and the concrete foundation shall be filled with 2 component urethane caulking (note that

Polyguard Reactive Gel is not appropriate in that location, since gel will not remain in place when exposed to weather).

3.6 BOLTED TANKS

Bolted tanks are not permitted on this project.

3.7 DISINFECTION

The reservoir and connecting lines thereto shall be disinfected with chlorine before being placed in operation.

3.7.1 Tank

The reservoir shall be disinfected in accordance with AWWA C652. After the chlorination procedure is completed and before the storage facility is placed in service, the Contracting Officer will collect samples of water in properly sterilized containers for bacteriological testing from the full facility in accordance with Section 7 of AWWA C652. The tank will not be accepted until satisfactory bacteriological results have been obtained.

3.7.2 Piping

The valves and piping shall be disinfected in accordance with Section

33 11 00 WATER DISTRIBUTION.

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