READ AND REMOVE THIS PAGE BEFORE PLACING
THE SPECIFICATION SECTION IN THE CONTRACT

* * * * * * * * * *

DIVISION 13:  SPECIAL CONSTRUCTION

SECTION 13209 ‑ WATER STORAGE TANKS

USE:	Furnishing and installing above ground steel water storage tanks, and other appurtenances necessary to complete the storage tanks.  This section does not specify flammable liquid storage tanks.

NOTES TO SPECIFIER:

A.	Options within paragraphs are identified by enclosure in brackets; blank spaces enclosed by brackets [      ] provide for information to be inserted, as appropriate to individual projects.

B.	TO AVOID CONFLICTING REQUIREMENTS AND COSTLY MISTAKES, the specifier must edit (delete, substitute or add to the text).  The remaining paragraphs must be renumbered.

C.	DELETE FOR FINAL COPY: Notes to the Specifier, located between lines of asterisks; all [brackets], underlining, boldface, and italics within the paragraphs; and this page.  (Open Reveal Codes [alt F3] to do this accurately).

D.	To Edit “(Footer B)”: (Corel 8).  ENTIRE FOOTER SHOULD BE BOLDED.  Click in the footer and delete the “Project Name (ftr B)” text and replace it with the Name Of The Project (upper/lower case).  Replace date with current MM/YY (WITHOUT BRACKETS). 

E.	The Guide Specifications are intended to be continuously reviewed and revised.  User’s technical comments are appreciated.  Also, other related or similar specifications that are written “from scratch” that could benefit others, or other questions can be sent to NSTC A/E Group, ST-110 or call (303) 987-6851.

F.	DESIGN NOTES:

Use of a steel water storage tank is a decision that should be made only after careful consideration of alternatives (concrete, fiberglass, plastic, glass-fused steel, etc.).  AWWA D 100 is a very comprehensive standard which addresses all aspects of welded steel water storage tanks.  Designers should be familiar with this standard, and use additional references to specific provisions as appropriate.

Consider freezing potential, and damages that could result from ice layer movement in the tank.  Corrosion protection is part of the design and installation of any steel water storage tank.  This includes an appropriate paint system, as well as cathodic protection.  It is suggested that painting be addressed in a separate section in division 9, separately from other painting requirements of the project.  The interior paint for any potable eater storage tank should be listed by the National Sanitation foundation as approved for use in contact with potable water.

Cathodic protection should be designed in consideration of the characteristics of the water to be stored, as well as the environment in which the tank will reside.  Either sacrificial aanode (using magnesium anode) or impressed current systems can be used.  Sacrificial anode systems are generally simpler to design, and often consist of anodes, electrically bonded to the tank, suspended into the water.  Most cylindrical tanks should have at least three such anodes evenly spaced at a distance of one-third the tank radius from the sides, extending about halfway into the depth of the contained water.

1.	DRAWING DATA REQUIRED: Drawings should indicate the desired tank configuration, including only those specific details and dimensions required beyond the conformance with standards in the specification.  Examples include minimum and maximum water surface elevations, pipe penetration locations, connecting pipe and valve configuration, clearances from existing structures or other site features, and types of foundation.  A site plan which establishes horizontal location and shows all connected lines, including drain and overflow piping is also needed.

REVISIONS OF THIS SECTION:
CSI format, editorial changes 9/99
Metric: 3/00
Technical Update: 3/00

SECTION 13209

WATER STORAGE TANKS

PART 1:  GENERAL

1.1	SUMMARY

A.	Section Includes:  [Furnishing] [and] [Installing] [Installing with] [Government‑furnished property] [Contractor‑furnished and Government‑furnished property] [elevated] steel water storage tanks, and other appurtenances necessary to complete the storage tanks.

B.	Related Sections:

******************************************************************************
LIST ITEMS OF WORK THAT MIGHT LOGICALLY BE FURNISHED AND INSTALLED UNDER THIS SECTION, BUT INSTEAD ARE SPECIFIED IN ANOTHER SECTION.  THIS ARTICLE IS RARELY REQUIRED.
******************************************************************************

1.2	SYSTEM DESCRIPTION

******************************************************************************
MODIFY BELOW PARAGRAPH WHEN REQUIRED BY THE CORROSIVE NATURE OF STORED WATER, LACK OF PROPER MAINTENANCE FACILITIES, OR BY CLIMATIC CONDITIONS. 
******************************************************************************

	A.	Design Requirements:  The design fabrication, and erection of the [elevated] tank shall be according to the applicable requirements of AWWA D 100.  Earthquake design shall be for seismic zone [___].  The elevated tank shall be designed for a basic wind speed of [___] km ([___] miles) per hour in accordance with ASCE 7 or designed in accordance with AWWA D 100 wind load design, whichever provides the greater pressure.  [The elevated tank shall be designed for a snow load of [    ]psf ([    ] Pa).

1.3	SUBMITTALS

A.	General:  Submittals shall be according to [Section 01009 ‑ General Information and Requirements.]  [Section 01331 ‑ Submittal Procedures.] and  [Section 01331 ‑ Certificates.]

B.	Manufacturer's Literature:  Submit three copies of manufacturer's descriptive data for the tank, including accessories, components, and interior and exterior coating systems to be used.

C.	Shop Drawings:  Submit three copies of shop drawings for foundations and shop drawings of catalog cuts of the steel tank to be used on this project.  Shop drawings shall show types, sizes, and locations of all panels, members and accessories, metal gauges, welded joints, and other construction details.  Standard welding symbols as recommended by the AWS shall be used.  Provide metallurgical information on the steel used in the tank system.

D.	Certificates of Conformance:  Submit three copies of written certification from the supplier of the following Contractor‑furnished items to be used on this project that they conform to the requirements of this specification section:
1.	Tank
2.	Piping and Fittings
3.	Valves; Gate, Check, [and Altitude]
4.	Pressure Gauge
5.	Interior Coating System
6.	Exterior Coating System
7.	Work was inspected in accordance with AWWA D 100, Section 11.  This shall meet the requirements of Section 11.2.1 and also cover the hydrostatic test.

F.	Design Analyses and Calculations:  Submit three copies of the structural design loading conditions used for the design of entire tank including the foundation.

1.3	QUALITY ASSURANCE

A.	Failure Criteria:  Not limited to the following:
1.	Evidence of leakage
2.	Malfunctioning valves
3.	Blockage of piping
4.	Contamination of water rendering it not potable
5.	Misalignment or settlement of tank structure

1.4	DELIVERY, STORAGE, AND HANDLING

A.	Storage:  Items which are subject to deterioration by exposure to the elements must be stored off the ground, in a well‑drained location, protected from the weather, and accessible for inspection and handling.

1.5	MAINTENANCE

A.	Touch‑Up Paint:  Furnish 1 gallon (3.8 liters) each of inside and outside paint for field touch‑up for each tank furnished.

PART 2:  PRODUCTS

2.1	MATERIALS

A.	Tank:  The steel water storage tank shall be fabricated from materials as shown on the drawings and according to AWWA D 100.

B.	Accessories:  Attached valve pit, access parts and other accessories shall be constructed as shown on the drawings.

C.	Pipes:  ASTM A 153; appurtenant pipes 4 inches (100 mm) in diameter or larger shall be welded steel; pipes smaller than 4 inches (100 mm) in diameter shall be galvanized steel.

D.	Fittings:  ASTM A 153 or ASTM B 633, for threaded pipe.

E.	Check Valves:  AWWA C 508, horizontal swing check valve, flanged ends, and composition to metal seat.

F.	Small Valves:  ASTM B 62 for valves, 2 inches (50 mm) and smaller.

G.	Concrete and Reinforcing Steel:  For foundations, valve vaults, pipe supports and blocking shall conform to the requirements of [Section 03306 - Minor Concrete.]  [Section 03310 ‑ Structural Concrete.]

2.2	FABRICATION

A.	Volume and Size of Tank:  [Elevated steel tank] [Skid-mounted horizontal tank] [Steel standpipe] [Steel ground storage reservoir] shall have a minimum active volume of [    ] gallons ([    ] cubic meters).  High water level shall be at elevation [    ,] with top of foundations at elevation [    ].  Range between high and low water level shall be approximately [    ] feet ([    ] m). [Elevations shall be as shown].

B.	Elevated Steel Tank:  AWWA D 100 for fabrication.  Tank shall have an ellipsoidal or spheroidal top and bottom.  Construct tank support tower of tubular sections.  Thoroughly brace tower with horizontal struts and diagonal tie.  Tower columns may be vertical or inclined as the design may require.  Main column splices shall be located at the intersection of the centerline of the struts.  Weld splice plates to hold members in line and to transmit tension or shearing stresses to which the members may be subjected.  Make connections between tank and columns to distribute the load over the column sections and the shell of the tank.  [Provide a balcony at least 2 feet (600 mm) wide and a structural‑steel handrailing at least 42 inches (1050 mm) high around the balcony.  Make balcony floor plates at least 1/4‑inch (6 mm ) thick and punch or drill for drainage].  

C.	[Steel Standpipe:]  [Steel Ground Storage Reservoir:]  [Skid-Mounted Horizontal Tank:]  Shall have a standard shell height and diameter that meet the requirements for selected capacity and high water elevation according to AWWA D 100.

D.	Accessories:  AWWA D 100, section 7 for [steel standpipe] [steel ground storage reservoir] with the following additions or modifications.  Safety devices are required.  Pipe connections shall be [    ]inches ([    ]) mm in diameter for inlet, [    ]inches ([    ]) mm in diameter for outlet, and [    ]inches([    ]) mm in diameter for draining of tank.  Overflow shall be [stub] [to ground] of [    ]inches ([    ]) mm in diameter.  Vent connection shall be [     ]inches ([    ]) mm.  A manhole cover on top of the tank will provide access to the inside of the tank.

E.	Tank Openings:  See Work Data Sheet.

******************************************************************************
Delete information when corrosion protection is not required. 
******************************************************************************

F.	Corrosion Protection:  Shall be sacrificial anodes or other corrosion protection as recommended by the tank manufacturer.

******************************************************************************
Several options for surface preparation and paint systems are available.  Check references closely and use coating manufacturer’s representatives for information as appropriate.  Attention to coating volatile organic compounds and toxicity is also important.
******************************************************************************

G.	Shop Painting:
1.	After sand blasting, paint shall be applied on the inside of the tank before oxidation occurs.  Maximum time between sand blasting and painting shall be 24 hours.  Surface preparation and painting the inside of tank shall conform to NSF 61 and SSPC Manual, Good Painting Practices, Volume 1, Chapter 14. [Use formula 151, with white or blue finish coat.  Use contrasting color for each coat.][Use commercially available polyamide epoxy system.]  
2.	Surface preparation and painting of the outside of tank shall be in conformance with SSPC Manual, Good Painting Practices, Chapter 14, Volume 1.

H.	Heating:  In cold climates, water tanks that serve fire systems and those where the daily consumption is small will be provided with heating facilities according to NFPA 22.  The size of the heating system may be reduced by an amount commensurate with the W (Btu per hour) input from makeup water during periods of minimum consumption. However, the heating facility will be capable of maintaining the coldest water in the tank at a minimum temperature of 42 degrees F.  (6 degrees C).  (Do not provide frostproof casings in lieu of heat for large riser tanks.

2.3	SOURCE QUALITY CONTROL

******************************************************************************
DETERMINE IF SHOP TESTING IS REQUIRED.  WHEN IT IS, THEN DETERMINE WHETHER THE GOVERNMENT OR THE CONTRACTOR IS GOING TO PERFORM THE REQUIRED TESTING AND EDIT ACCORDINGLY.
******************************************************************************

A.	Testing:  [The Government will perform the required testing, recording, and distributing of the results.]  [The Government will make arrangements for a certified independent testing laboratory to perform the required testing, recording, and distributing of the results.]  [Conduct the performance and acceptance tests according to Section 4 of AWWA C 600.]  [Furnish necessary equipment, labor, and materials to conduct the testing.  Testing shall be conducted in the presence of the Contracting Officer.]  [Arrange for a certified independent testing laboratory, according to the requirements of Section 01458 - Testing Laboratory Services, to perform the required testing, recording, and distributing of the results.]

B.	Radiographic Inspection:  Shop fabricated steel storage tanks shall have radiographic inspection of weld joints.  Perform the inspection according to the requirements of AWWA D 100, section 11, Inspection and Testing.
1.	Personnel performing radiographic inspection shall be qualified according to SNT-T-1A.  Only individuals qualified NDT Level II, or NDT Level I working under an NDT level II shall perform testing.
2.	Unacceptable welds shall be repaired according to the AWS D 1.1 at no additional cost to the Government.
3.	Furnish radiographic test reports and film to the Contracting Officer.  Repair welds determined to be unacceptable on the basis of the test results.
4.	When a weld is unacceptable on the basis of a visual inspection, additional radiographs shall be made of that weld.  When the weld is unacceptable, the Contractor shall pay the cost of the additional radiograph and repair.
5.	After acceptance of the structure, the radiographs and written reports will become the property of the Government.

PART 3:  EXECUTION

3.1	PREPARATION

A.	Clearing and Grubbing:  Shall be performed according to Section 02231 ‑ Clearing and Grubbing.

B.	Foundations:  Construct foundations [including foundation design] according to AWWA D 100 for the general type of foundation indicated.

3.2	INSTALLATION

A.	Placement:  Install the tanks according to the manufacturers' instructions and these specifications and drawings.  Consult and comply with local codes.  Failure to follow these installation instructions may result in tank failure.
1.	Tanks should not be dropped, rolled or impacted.  Chock the tanks until ready for installation.
2.	Use installed lift lugs to lift tank.  Guide the tank with guidelines.  Do not use chains or cables around the tanks.  When tanks have to be moved, they must be set on smooth ground free of rocks and foreign objects and rechocked.  Capacity of lifting equipment should be checked before installation.  When tanks are dropped or impacted after initial test, retest tanks and soap areas of impact to check for tank damage.  When damage has occurred, do not attempt repairs.  Contact the area tank sales representative for further instructions.
3.	When the tank has been installed and tested for leakage, paint areas needing touch‑up.  Paint piping exterior to the tank above ground in the same manner as the tank.

B.	Piping:  AWWA C 600, Sections 1 and 3 and Section 02514 - Site Water Distribution.

3.3	FIELD QUALITY CONTROL

******************************************************************************
DETERMINE WHETHER THE GOVERNMENT OR THE CONTRACTOR IS GOING TO PERFORM THE REQUIRED TESTING AND EDIT ACCORDINGLY.
******************************************************************************

A.	Testing:  [The Government will perform to required testing, recording, and distributing of the results.]  [The Government will make arrangements for a certified independent testing laboratory to perform the required testing, recording, and distributing of the results.]  [Conduct the performance and acceptance tests of the [____________________].  Furnish necessary equipment, labor, and materials to conduct the testing.  Testing shall be conducted in the presence of the Contracting Officer.]  [Arrange for a certified independent testing laboratory, according to the requirements of Section 01458 - Testing Laboratory Services, to perform the required testing, recording, and distributing of the results.

B.	Radiographic Inspection:  Radiographically inspect weld joints on field fabricated steel storage tanks.  Perform the inspection according to the requirements of AWWA D 100, section 11, Inspection and Testing.
1.	Personnel performing radiographic inspection shall be qualified according to ASNT-TC1A.  Only individuals qualified NDT Level II, or NDT Level I working under an NDT Level II shall perform testing.
2.	Repaired unacceptable welds according to the AWS D 1.1 at no additional cost to the Government.
3.	Furnish radiographic test reports and film to the Contracting Officer.  Repair welds determined to be unacceptable on the basis of the test results.
4.	When a weld is unacceptable on the basis of a visual inspection, additional radiographs shall be made of that weld.  When the weld is unacceptable, the Contractor shall pay the cost of the additional radiograph and repair.
5.	After acceptance of the structure, the radiographs and written reports shall become the property of the Government.

C.	Air Test:  Before placing tank in the excavation, provide an above ground air test according to the manufacturers instructions or the following: Introduce air into the tank to create an internal pressure of 3 to 5 psig while a soap solution is applied to weld seams.  No evidence of air leakage shall be observable at weld seams, and no pressure loss of 1.0 psi or more shall occur during and 8-hour test period, without introduction of additional air.

******************************************************************************
NORMALLY, CATHODIC PROTECTION SHOULD BE ADDRESSED AS A DESIGN SPECIFIC TO THE TANK, THE CHEMISTRY OF WATER IT WILL STORE, AND THE ENVIRONMENT TO WHICH IT WILL BE SUBJECTED.
******************************************************************************

3.4	CATHODIC PROTECTION

A.	Requirements:  Provide(s) evenly spaced, [12] pound magnesium anode, suspended from the top of the tank at a distance of one-third the tank radius from the sides, extending below the water surface, electrically bonded to the tank.

3.5	CLEANING

******************************************************************************
CHOOSE ONE OF THE FOLLOWING OPTIONS:
AWWA C 652 COVERS THREE METHODS FOR DISINFECTION.  TYPICALLY, ONLY ONE METHOD WILL BE USED FOR A GIVEN STORAGE FACILITY DISINFECTION, BUT COMBINATIONS OF
THE METHODS MAY BE USED.  THE THREE METHODS ARE:
1.  CHLORINATION OF THE FULL STORAGE FACILITY SUCH THAT THE END OF THE APPROPRIATE RETENTION PERIOD THE WATER WILL HAVE A FREE CHLORINE RESIDUAL OF NOT LESS THAN 10 MG/L.
2.  SPRAYING OR PAINTING OF ALL STORAGE FACILITY WATER CONTACT SURFACES WITH A SOLUTION OF 200 MG/L AVAILABLE CHLORINE.
3.  CHLORINATION OF FULL STORAGE FACILITY WITH WATER HAVING A FREE CHLORINE RESIDUAL OF 2 MG/L AFTER 24 HR.
******************************************************************************

A.	Disinfection:  [Disinfect tank and connecting lines according to AWWA C 652, [Method 1] [Method 2] [or] [Method 3].  After disinfection, flush tank and connecting lines and dispose of chlorinated water in accordance with AWWA C 651 [and according to Section 02512 - Disinfection of Water Distribution].

******************************************************************************
OBSTRUCTION LIGHTING MAY BE REQUIRED ON ELEVATED TANKS.  THE FOLLOWING PARAGRAPH CAN BE DELETED FOR OTHER TYPES.
******************************************************************************

3.6	OBSTRUCTION LIGHTING

A.	Requirements:  Provide obstruction lighting as indicated.  Place wiring in rigid conduit and threaded conduit fittings.  Control obstruction lighting by a [time switch] [photo-electric control] enclosed in a cast metal weatherproof housing located approximately  6-feet (1.8 m) above the ground on [standpipe] [one of the tower legs].  Perform electrical work in accordance with NFPA 70.
PART 4:  MEASUREMENT AND PAYMENT

4.1	METHOD OF MEASUREMENT

******************************************************************************
WHEN A "LUMP SUM" CONTRACT IS USED, DELETE THE TITLE PART 4:  MEASUREMENT AND PAYMENT, AND BOTH ARTICLES FROM THIS SECTION.  MEASUREMENT AND PAYMENT WILL BE ADDRESSED IN PART 4 OF SECTION 01009 OR SECTION 01010.

WHEN NOT A "LUMP SUM" CONTRACT, SELECT APPLICABLE PHRASES; USE THE "NO MEASUREMENT" PHRASE WHEN NONE OF THE PAY ITEMS IN THIS SECTION ARE INCLUDED IN THE BID SCHEDULE.
******************************************************************************

A.	Units:  The work described in this section will [not be measured for payment.]  [be measured and paid for] [on a lump sum basis.]  [per each tank.]

4.2	BASIS OF PAYMENT

******************************************************************************
WHEN NOT A "LUMP SUM" CONTRACT, SELECT APPLICABLE PHRASES; USE THE "NO DIRECT PAYMENT" PHRASE WHEN NONE OF THE PAY ITEMS IN THIS SECTION ARE INCLUDED IN THE BID SCHEDULE.

WHEN NOT A "LUMP SUM" CONTRACT AND PAYMENT IS TO BE MADE UNDER THIS SECTION, SELECT APPLICABLE PAY ITEMS.  DO NOT CHANGE PAY ITEM NUMBER.  WHEN GOVERNMENT‑FURNISHED PROPERTY IS SPECIFIED FOR PAY ITEMS, THE LETTER SUFFIX GF WILL BE ADDED AFTER THE PARENTHESIS OF THE ITEM NUMBER.
******************************************************************************

A.	Payment:  [No direct payment for the work described under this section will be made.  Consideration for this item shall be included in the bid price for other items of the Contract.]  [Prices and payment will be full compensation for the work described in this section.  Payment will be made under:]

Pay Item                                    		Pay Unit

13209(01)  Elevated Steel Water Storage Tank. . . . . . . . . Lump Sum
		13209(02)  Elevated Steel Water Storage Tank. . . . . . . . . Each
		13209(10)  Steel Standpipe. . . . . . . . . . . . . . . . . . Lump Sum
		13209(11)  Steel Standpipe. . . . . . . . . . . . . . . . . . Each
		13209(20)  Steel Ground Water Storage Tank  . . . . . . . . . Lump Sum
		13209(21)  Steel Ground Water Storage Tank  . . . . . . . . . Each

END OF SECTION

WORK DATA SHEET

for

SECTION 13209 ‑ WATER STORAGE TANKS

Number of tanks required:

Drawings:  This Work Data Sheet shall be used in conjunction with Drawing
No.                                .

Length of tank:

	       ft       inches (L:       m) 

Inside Diameter D1     ft       inches: (      mm)

Outside Diameter D2:      ft       inches (       mm)

Capacity of tank:         gallons (         liters )

Tank Openings:  (Drawing No. 13205‑l)

1.	Opening A					5.	Opening E
  
  Opening size: 					  Opening size:
      inches (     mm)			       inches (     mm)
  Detail:						  Detail:
  Distance 'D':					  Distance ‘D’:
  Remarks:						  Remarks:

2.	Opening B					6.	Opening F

  Opening size:  					  Opening size:
      inches (     mm)				      inches (     mm)
  Detail:						  Detail:
  Distance 'D':					  Distance ‘D’:
  Remarks:						  Remarks:

3.	Opening C					7.	Opening G

  Opening size:  					  Opening size:
      inches (     mm)				      inches (     mm)
  Detail:						  Detail:
  Distance 'D':					  Distance ‘D’:
  Remarks:						  Remarks:

4.	Opening D

  Opening size:
      inches (     mm)
  Detail:
  Distance 'D':
  Remarks:

Note:  When openings are not required, list opening and use phrase "Not Required."  When several tank projects are included, the tabular format may be more appropriate.  (01/28/97)