S06 AMENDED Spec Section 33 16 15 07202022.pdf

33 6 15 - 1

1. Bulletin No. 1

2. SO6 RFI Responses

Department of Veterans Affairs VA Project No. 650-19-100

Providence VA Medical Center Replace Boilers in Building 10

Providence, RI 100% Corrected Construction Documents: 01/07/2022

11-01-20

SECTION 33 16 15

WATER STORAGE STEEL TANKS

PART 1 – GENERAL

1.1 DESCRIPTION

A. The following information will be shown on the project drawings:

1. Detail plans to show tank location, elevation, valve vault if required, and connection to system.

2. Accessories as depth indicator, telemetering automatic controls, protection against freezing, or other special project requirements.

3. Requirements of UFC 3-260-01 and the Federal Aviation Agency to determine if tank constitutes an obstruction and hazard to aerial navigation. If so, show pattern for orange and white painting.

4. Detail obstruction lights or beacon and intermediate lights as required.

5. Requirements for cathodic protection system, including details of anodes, anode layout, wiring connections, and rectifier (as applicable).

1.2 APPLICABLE PUBLICATIONS

A. 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.

B. AMERICAN CONCRETE INSTITUTE (ACI)

318 .................... Building Code Requirements for Structural

Concrete (ACI 318-14) and Commentary (ACI

318R-14)

C. AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AISC)

325-2017 ............... Steel Construction Manual

ASCE/SEI 7-2017 ........ Minimum Design Loads for Buildings and Other

Structures

D. AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

B16.3-2016 ............. Malleable Iron Threaded Fittings, Classes 150 and 300

B16.4-2016 ............. Standard for Gray Iron Threaded Fittings;

Classes 125 and 250

B40.100-2013 ........... Pressure Gauges and Gauge

E. AMERICAN WATER WORKS ASSOCIATION (AWWA)

B300-2018 .............. Hypochlorites

33 6 15 - 2

B301-2010 .............. Liquid Chlorine

C104/A21.4-2016 ........ Cement-Mortar Lining for Ductile-Iron Pipe and

Fittings for Water

C105/A21.5-2018 ........ Polyethylene Encasement for Ductile-Iron Pipe

Systems

C110/A21.10-2012 ....... Ductile-Iron and Gray-Iron Fittings for Water

C111/A21.11-2017 ....... Rubber-Gasket Joints for Ductile-Iron Pressure

Pipe and Fittings

C115/A21.15-2020 ....... Flanged Ductile-Iron Pipe With Ductile-Iron or

Gray-Iron Threaded Flanges

C150/A21.50-2014 ....... Thickness Design of Ductile-Iron Pipe

C151/A21.51-2017 ....... Ductile-Iron Pipe, Centrifugally Cast

C500-2019 .............. Metal-Seated Gate Valves for Water Supply

Service

C504-2015 .............. Standard for Rubber-Seated Butterfly Valves

C508-2017 .............. Swing-Check Valves for Waterworks Service, 2

In. Through 48-In. (50-mm Through 1,200-mm)

NPS

C600-2017 .............. Installation of Ductile-Iron Mains and Their

Appurtenances

C652-2019 .............. Disinfection of Water-Storage Facilities

D100-2011 .............. Welded Steel Tanks for Water Storage

D103-2009; Errata 2010; Addenda 2014) Factory-Coated Bolted Steel

Tanks for Water Storage

F. AMERICAN WELDING SOCIETY (AWS)

D1.1/D1.1M-2020 ........ Structural Welding Code - Steel

D1.3/D1.3M-2018 ........ Structural Welding Code - Sheet Steel

G. ASTM INTERNATIONAL (ASTM)

A48/A48M-2003; R 2016 .. Standard Specification for Gray Iron Castings

ASTM A53/A53M-2020 ..... Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and

Seamless

H. MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS

INDUSTRY (MSS)

SP-80-2019 ............. Bronze Gate, Globe, Angle and Check Valves

I. NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

22-2018 Standard for Water Tanks for Private Fire

Protection

33 6 15 - 3

J. NSF INTERNATIONAL (NSF)

NSF/ANSI 61-2020 ....... Drinking Water System Components - Health

Effects

K. U.S. FEDERAL AVIATION ADMINISTRATION (FAA)

AC150/5345-43-2019; Rev J Specification for Obstruction Lighting

Equipment.

1.3 SUBMITTALS

Submit the following, in accordance with Section 01 33 23 SHOP DRAWINGS, PRODUCT DATA AND SAMPLES:

A. Manufacturer's Qualifications

1. The manufacturer and installer must demonstrate a minimum 10 years of experience in the manufacturing and construction of ground supported steel water storage tanks. Manufacturer must be able to demonstrate experience through the design and construction of at least 5 completed projects of similar type and size with references with current position, address, and contact information.

B. Provide certified manufacturer's design analysis, detail drawings, and foundation design analysis by an authorized licensed engineer in the geographical area where construction will take place, having a minimum

4 years of experience as an engineer knowledgeable in design and analyses of steel storage tanks and its foundations.

C. Submit a certificate signed by a registered professional engineer, providing the following information:

1. Description of the structural design loading conditions used for the design of entire tank including the foundation.

2. Description of the structural design method and codes used in establishing the allowable stresses and safety factors applied in the design.

3. A statement verifying that the structural design has been checked by experienced engineers specializing in hydraulic structures.

4. 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 AWWA, ACI, and other applicable standards.

D. Welding Qualifications

1. Qualification of welding procedures, welders, and welding operators must be in accordance with Section 8.2 of AWWA D100 or AWWA D103

33 6 15 - 4 and AWS D1.1/D1.1M and AWS D1.3/D1.3M.

E. Tank Coating System Certifications

1. Coating materials for interior applications and all other materials which will be in normal contact with potable water must conform to

NSF/ANSI 61. Certification by an independent third-party organization that all interior coatings and materials that come in contact with potable water must comply with NSF/ANSI 61 must be provided.

PART 2 - PRODUCTS

2.1 SYSTEM DESCRIPTION

A. Design Requirements

1. The design, fabrication, and erection of the welded steel water storage tank must be in accordance with the requirements of AWWA

D100 or AWWA D103 and ASCE 7-16. Submit design analyses and manufacturer's technical literature.

B. The following data and information are supplied as a basis for design and erection of the tank and appurtenances:

1. Tank Capacity and Dimensions

a. Top Capacity Level (TCL) 22.5 foot2

b. Bottom Capacity Level (BCL) 1 foot

c. Diameter 20 foot2

d. Tank Height (Maximum) 24 foot2

e. Top of Foundation Elevation 12 inch

2. Seismic Design Criteria

a. Seismic Risk Category IV

b. Seismic Importance Factor, Ip 1.5

c. Site Class D

d. Ss - 0.091

e. S1 - 0.055

3. Design Wind Loading

a. Design Wind Speed, V 123 mph (Ultimate)

b. Gust Factor, G 0.85

c. Importance Factor 1.0

d. Exposure Category C

4. Roof Design Loading

a. Roof Live Load 20

b. Ground Snow Load 15

C. Ground-Supported Flat Bottom Water Storage Tank

33 6 15 - 5

1. Water Storage Steel tank shall be all-welded construction of the most economical design. All members of structural steel or of reinforced concrete shall be designed to safely withstand the maximum stresses to which they may be subjected during erection and operation. Sizing and design of welded steel elevated tank must be in accordance with Section 4 of AWWA D100.

a. The minimum operating capacity of the storage tank will be

50,000 US gallons. 2

b. The tank diameter will be 20 feet. 2

c. The height of the tank from top of foundation to High Water

Level and alarm, shall be 22.5 feet. 2

d. Top of foundation elevation, see structural and civil drawings.2

e. The existing ground elevation, see structural and civil drawings.2

f. The finished ground elevation, see structural and civil drawings.2

2. The minimum thickness for any part of the structure shall be 3/16 inch for parts not in contact with water and 1/4 inch for parts in contact with water.

3. The tank roof shall be designed as per the project drawings. All interior lap joints will be sealed by means of caulking or continuous seal welding. The interior lap joints shall be defined to include roof plate laps. If roof is supported by rafters, the rafter shall be welded to the roof plates as required structurally.

Any unwelded rafter to plate joints shall be sealed by caulking.

The minimum thickness for roof plates not in contact with water will be 3/16”.

D. Foundation

1. Foundation design and construction must be in accordance with

Section 13 of AWWA D103 and ACI 318.

2. The foundation design must be based on recommendations provided in the Geotechnical investigation included with the Contract Document.

2.2 MATERIALS

A. Provide materials conforming to the following requirements:

1. Steel

a. Comply with design requirements of Section 2 of AWWA D100 or

33 6 15 - 6

Section 2 of AWWA D103 and AISC 325.

b. Standing seam shell and roof insulation panels to be in accordance with NFPA 22. 2

2. Shop Fabrication

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

3. Ductile-Iron Pipe

a. Pipe, fittings, joints and couplings for fluid conductors, except for overflow pipe, must be ductile-iron pipe and must be either of the following:

1) Bell-and-Plain End Pipe

b. AWWA C150/A21.50 and AWWA C151/A21.51, for not less than 1035 kPa 150 psi working pressure, unless otherwise shown or specified.

c. Joints must be push-on or mechanical-joint conforming to AWWA

C111/A21.11 with pressure rating equivalent to that of the pipe.

d. Provide standard thickness cement mortar lined in accordance with AWWA C104/A21.4.

4. Flanged Pipe

a. Flanged pipes must conform to the applicable portions of AWWA

C110/A21.10, AWWA C115/A21.15 and AWWA C151/A21.51, for not less than 1035 kPa 150 psi working pressure, unless otherwise shown or specified.

b. Pipe must have flanged ends in accordance with AWWA C115/A21.15

c. Provide standard thickness cement mortar lining in accordance with AWWA C104/A21.4.

5. Specials and Fittings (except for overflow pipe)

a. Ductile-Iron with Bell-and-Plain End

1) AWWA C110/A21.10 and AWWA C151/A21.51 for not less than 1035 kPa 150 psi working pressure, unless otherwise shown or specified. Provide standard thickness cement mortar lining in accordance with AWWA C104/A21.4.

6. Ductile-Iron with Flanged Ends

a. AWWA C110/A21.10 and AWWA C151/A21.51 for not less than 1035 kPa

150 psi working pressure unless otherwise shown or specified.

b. Fittings must have flanged ends in accordance with AWWA

C110/A21.10.

c. Provide standard thickness cement mortar lining in accordance with AWWA C104/A21.4.

33 6 15 - 7

7. Steel Piping

a. Pipe, ASTM A53/A53M, Standard Weight, zinc-coated for not less than 1035 kPa 150 psi working pressure unless otherwise shown or specified.

b. Fittings, ASME B16.4, Class 125, zinc coated; or ASME B16.3, Class 150, zinc coated, threaded.

8. Joints Inside Valve Chamber

a. All joints inside the valve chamber must be flanged.

9. Valves

a. Provide all valves from one manufacturer.

10. Gate Valves

a. Gate valves must be opened by turning counterclockwise. Valves

80 mm 3 inches and larger must be stem type with joint ends compatible for the adjoining pipe conforming to AWWA C500.

b. Valves smaller than 80 mm 3 inches must be all bronze and must conform to MSS SP-80, Type 1, class 150. Valves 80 mm 3 inches or larger located in valve chambers must be equipped with hand-operating wheels and must be flanged.

11. Rubber-Seated Butterfly Valves

a. Rubber-seated butterfly valves must be opened by turning counterclockwise.

b. Valves must conform to AWWA C504.

c. Body and disc must be cast iron, conforming to ASTM A48/A48M.

Shaft must be 18-8 stainless steel.

d. Resilient seat must be bonded to the valve body.

e. Butterfly valves must be stainless steel to rubber seated, tight closing type.

f. Flanged-end valves are required in valve chamber.

g. Provide a union or sleeve-type coupling in the chamber to permit removal.

12. Check Valves

a. Check valves must conform to AWWA C508 and be of the horizontal

b. swing-check type, suitable for the purpose and the operating conditions. The body must be cast iron with flanged ends with pressure rating equivalent to that of the connecting pipe.

13. Altitude Valve

a. The supply to the tank must be controlled by a one-way 3 inch altitude valve, automatic in operation and accurately set to

33 6 15 - 8 prevent overflow of the tank.

b. The valve must have flanged ends and a heavy cast iron body, must be bronze fitted with renewable cups and seats, and must be designed without metal-to-metal seats.

c. The valve must be cushioned when opening and closing to prevent water hammer or shock.

d. Valves must be provided with a travel indicator to determine operating position.

e. All necessary repairs and/or modifications other than replacement of the main valve body must be made possible without removing the valve from the pipeline.

14. Pressure Gauge

a. Pressure gauge of the direct-reading type, equipped with a shutoff cock, must be provided, in the valve chamber, on the tank side and on the discharge side of the check or altitude valve.

b. Gauges must have 150 mm 6-inch dials, must be stem mounted, and must conform to ASME B40.100.

c. Accuracy of gauges must be Grade A or better.

d. Gauges must be calibrated in kPa and psi psi in not more than10 kPa and psi 2 psi increments from 0 to

e. 350 kPa and 0 to 50 psi 0 to 50 psi in excess of the normal operating pressure at the tank.

15. Joint Sealants and Gaskets

a. The lap joint sealant must be a one component, moisture cured, polyurethane compound in accordance with Section 4.10 of AWWA

D103. The sealant must be suitable for contact with potable water must comply with NSF/ANSI 61.

b. Neoprene gaskets and tape type sealer must not be used in liquid contacting surfaces.

2.3 ASSEMBLIES

The following tank accessories and assemblies must be coordinated for the specific type of tank being specified. Other components may need to be included based on service, maintenance, and operational needs of the facility. Adequate accessibility must be provided to the exterior of the tank for maintenance, inspection and painting. This may include items such as walkways, safety railing, tie-off anchors for scaffolding or rope inspections. Adequate access, ventilation, and supporting accessories to

33 6 15 - 9 the interior of tank must be provided to facilitate tank maintenance, inspection, painting, and for sanitizing and cleaning for environmental contamination such as Legionella.

A. Tank Accessories

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

Additional requirements for accessories are as follows:

a. External 4” steel Riser

B. Roof Hatches

1. Provide two access hatches 180 degrees apart on the roof of the tank.

2. One hatch must be 30-inch diameter and allow access from the roof to the interior of the tank.

3. The hatch will be hinged and equipped with a hasp for locking. The hatch cover must have a 2-inch downward edge.

4. The second hatch will be 24-inch diameter and flanged with a removable cover so constructed that an exhaust fan may be connected for ventilation during inspection, maintenance, painting, and cleaning operations.

5. The openings must have a minimum 4-inch curb

C. Tank Vent

1. Clog resistant tank vent must be centrically located on the tank roof above the maximum weir crest elevation.

2. The vent must conform to Section 5.5 or 7.5 of AWWA D100 or Section

7.7 of AWWA D103.

3. The tank vent must have an intake and relief capacity sufficient to ensure that excessive pressure or vacuum, either entering or leaving the tank, will not be developed during maximum flow rate.

4. The vent will be tank manufacturer's standard mushroom type constructed with corrosion resistant screen to prevent the ingress of wind driven debris, insects, birds and animals. The vent must be designed to ensure fail-safe operation in the event that screen frosts over or otherwise clogged and the bottom of the screen must be sufficiently elevated for snow consideration in the area.

D. Overflow

1. The overflow for the tank must consist of an overflow weir box and outside drop pipe, adequately supported and capable of discharging at a rate of 150 gpm with 6 inches of head, without the water level exceeding 22.75 feet or 53,400 gal. 2

33 6 15 - 10

2. The overflow pipe must be steel, ASTM A53/A53M or equal, and must terminate 300 to 600 mm 1 to 2 feet above grade not to be obstructed by snow or ground clutter and must be fitted with a flapper valve or course corrosion-resistant screen to prevent ingress of animals and insects.

E. Shell Access Manholes

1. Number, type, location, and size of manholes must be as shown on the drawings.

F. Pipe Connections

1. Number, type, location, load, and size of pipe connections must be as shown on the drawings.

2. Inlet pipe connections to extend 23’-5” 2 above tank bottom and must be provided with deflectors as shown on the drawings. Maintain a minimum 12” air gap between the fill outlet and the overflow weir.

3. Outlet pipe connections to extend 12 inches above tank bottom and must be provided with vortex breakers.

4. Pipe connections to the tank must include a flexible coupling outside the tank to allow for differential movement.

5. Pipe connections through the shell must include protection from freezing and vandalism.

6. Piping must allow for differential movement when the tank is filled and drained. Special flexible, extendable connections must be provided for tanks subject to seismic loads.

G. Ladders, Platforms, and Safety Devices

1. Ladders, platforms, and safety devices must be provided in accordance with Sections 7.4 of AWWA D100 or Sections 7.4 and 7.5 of AWWA D103.

2. Location of ladders must be as shown on the drawings. Sections 7.4 of AWWA D100 and Sections 7.4 and 7.5 of AWWA D103 represent the minimum requirement.

3. In addition, safety cage, rest platforms, roof platforms, roof ladder handrails, and other safety devices must be provided as required by federal or local laws or regulations.

H. Tank Level and Temperature Sensor

1. Provide (3) full height, rigid, combination temperature / level sensors.

2. Level accuracy: +/- 1/4”.

3. Temperature accuracy: +/- 1.0 Deg. F.

33 6 15 - 11

4. Communications to boiler plant control system: RS485 MODBUS.

I. Railing

1. Provide a structural steel railing with a top rail 1050 mm 42 inches above tank with an intermediate rail halfway between. Guard rail must be capable of withstanding a force of 888 N 200 pounds applied in any direction.

2. Extend guard rail the entire circumference of tank except where access openings are required. Openings should be with a gate which closes automatically.

2.4 COATINGS

A. Tank Coating System for Welded Tanks

1. Provide interior and exterior coating systems conforming to Section

09 91 00 PAINTING.

2.5 TANK HEATING

A. Provide tank heating to protect the tank from freezing in accordance with NFPA 22 Chapter 16 Water Tank Heating. Maintain water temperature at or above 5.6 degrees C (42 degrees F) at all times.

B. Electric Heat: Nickel chromium, electric-resistance elements, helix wound, factory-wired with time delay for element staging, and overcurrent and overheat protective devices.

C. A minimum of (2) heating elements are required, each capable of maintaining the tank above 42 Deg. F with an outside temperature of -10 Deg. F.

D. Standing seam shell and roof insulation panels to be 0.024” stucco embossed aluminum painted silver with polyester paint, per NFPA 22.1

2.6 CONCRETE WORK

A. Concrete work must conform to Section 03 30 00 CAST-IN-PLACE.

2.7 CHLORINE

A. 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

A. Foundations for the tank must be constructed of concrete, reinforced where necessary, and designed in accordance with Sections 12 and 13.7 of AWWA D100 or Sections 13 and 14.5 of AWWA D103 for earth with a

33 6 15 - 12 bearing value of MPa psf, at elevation 1351 ft., and constructed in conformance with the applicable requirements of Section 03 30 53 CAST-

IN-PLACE CONCRETE (SHORT FORM) unless specified otherwise.

3.2 EXCAVATING, FILLING, AND GRADING

A. Excavating, filling, and grading must conform to applicable requirements of Section 31 20 00 EARTHWORK.

3.3 LIGHTNING PROTECTION

A. Lightning protection must be provided, conforming to Section 26 41 00

FACILITY LIGHTNING PROTECTION.

3.4 TANK INSTALLATION

A. Submit detailed erection drawings, before proceeding with any fabrication.

B. Complete drawings with details of steel, piping and valve installation, and concrete work, and of the assembling of items required for the total installation.

C. Use standard welding symbols in accordance with AWS D1.1/D1.1M and AWS

D1.3/D1.3M.

D. Details of welded joints referenced on the drawings must be included.

E. Tank installation must be in accordance with the following requirements:

F. Welding

1. Section 8 of AWWA D100 or AWWA D103 and AWS D1.1/D1.1M and AWS

D1.3/D1.3M.

G. Erection

1. Section 10 of AWWA D100 or AWWA D103 and in accordance with manufacturer's procedures using factory trained and certified erectors.

H. Inspections and Testing

1. Tank inspection and testing must be in accordance with Section 11 of AWWA D100 AWWA D103.

2. 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.

3. Final hydrostatic and leak tests must be performed before painting of welded tanks.

3.5 PIPING INSTALLATION (EXCEPT FOR OVERFLOW PIPING)

A. General Guidelines

1. Where details of fabrication or installation are not shown on the

33 6 15 - 13 drawings, installation must conform to Section 1 and 4 of AWWA

C600.

B. Testing of Valves and Piping

1. After the tank has been erected and the valves and piping installed, and before field painting is begun, the valves and piping must be hydrostatically tested in accordance with Section 5 of AWWA C600.

2. Submit each coating manufacturer's technical data, application instructions, Safety Data Sheets (SDS), and certificate for compliance for VOC content.

3. Submit 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 covering the hydrostatic test and certifying that the work was inspected in accordance with Section 11.2.1 of AWWA D100.

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

C. Pipe Lining and Coating of Underground Ductile-Iron Piping

1. Polyethylene encasement in accordance with AWWA C105/A21.5 of underground ductile-iron piping must be provided in addition to cement-mortar lining.

D. Plugging Ends

1. Cap or plug pipe ends left for future connections as directed.

3.6 PAINTING AND COATING OF TANK

A. Each coating manufacturer's tank coating system technical data, application instructions, SDS, and certificate for compliance for VOC content must be submitted to the Contracting Officer.

B. Application, curing time, mixing and thinning of the coating materials must be in strict accordance with the manufacturer’s instructions.

C. The use of thinners must not alter the required minimum dry thickness or adversely affect the VOC content.

D. Exterior Surfaces (Welded Tanks)

1. Provide an exterior coating system conforming to Section 09 91 00

PAINTING.

33 6 15 - 14

E. Interior Surfaces (Welded Tanks)

1. All interior surfaces and all interior components of the tank shall be zinc metallized, and all exterior surfaces of the tank and any additional surfaces not previously designated shall be aluminum metallized after construction and testing.

3.7 DISINFECTION

The ground supported tank and connecting lines thereto must be disinfected with chlorine before being placed in operation.

A. Tank

1. After coating system has been cured, inspected, and approved cured, rinse tank with potable water. After flushing, the tank must be disinfected in accordance with AWWA C652. Thoroughly disinfect and sterilize the tank and connecting piping with a chlorine and hypochlorite solution as required by AWWA C652. Following a contact period of 24 hours, flush the system with clean water until the residual chlorine content is not greater than that of the water supply. All valves in water line being disinfected shall be opened and closed several times during the 24 hour period. Hypochlorite material shall comply with Fed Spec O-C-114 or Fed Spec O-S-602, grade B.

B. 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 5 of AWWA

C652.

C. The tank will not be accepted until satisfactory bacteriological results have been obtained.

D. Piping

1. The valves and piping must be disinfected in accordance with

Section 33 10 00 WATER UTILITIES.

3.8 DEMONSTRATION AND TRAINING

A. Provide services of manufacturer’s technical representative for four hours to instruct VA Personnel in operation and maintenance of the system.

--- END ---