Coatings Specification 6-1-2023.pdf

Coating System 1

SECTION 09900

COATING SYSTEMS FOR STEEL WATER STORAGE TANKS

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Coatings systems for interior and exterior water tanks and associated piping and appurtenances.

1.2 RELATED SECTIONS – NOT USED

1.3 REFERENCES

A. ANSI/NSF 61 - Drinking Water System Components - Health Effects.

B. ASTM D 16 - Terminology Relating to Paint, Varnish, Lacquer, and Related Products.

C. AWWA C 652 - Disinfections of Water-Storage Facilities.

D. AWWA D 102 - Painting Steel Water Storage Tanks.

E. SSPC-SP 6/NACE 3 - Commercial Blast Cleaning.

F. SSPC-SP 10/NACE 2 - Near-White Metal Blast Cleaning.

G. SSPC-SP 11 - Power Tool Cleaning to Bare Metal.

1.4 DEFINITIONS

A. Definitions of Painting Terms: ASTM D 16, unless otherwise specified.

B. Dry Film Thickness (DFT): Thickness of a coat of paint in fully cured state measured in mils (1/1000 inch).

1.5 SUBMITTALS

A. Not used.

B. Product Data: Submit manufacturer's product data for each coating, including generic description, complete technical data, surface preparation, and application instructions.

C. Color Samples: Submit manufacturer’s color samples showing full range of standard colors.

D. Manufacturer’s Quality Assurance: Submit manufacturer’s certification that coatings comply with specified requirements and are suitable for intended application.

Coating System 2

E. Applicator’s Quality Assurance: Submit list of a minimum of 5 completed projects of similar size and complexity to this Work. Include for each project:

1. Project name and location.

2. Name of owner.

3. Name of contractor.

4. Name of engineer.

5. Name of coating manufacturer.

6. Approximate area of coatings applied.

7. Date of completion.

F. Warranty: Submit manufacturer’s standard warranty.

1.6 QUALITY ASSURANCE

A. Manufacturer’s Qualifications:

1. Specialize in manufacture of coatings with a minimum of 10 years successful experience.

2. Able to demonstrate successful performance on comparable projects.

3. Single Source Responsibility: Coatings and coating application accessories shall be products of a single manufacturer.

B. Applicator’s Qualifications:

1. Experienced in application of specified coatings for a minimum of 5 years on projects of similar size and complexity to this Work.

2. Applicator's Personnel: Employ persons trained for application of specified coatings.

C. Pre-application Meeting: Convene a pre-application meeting on the first day of production before start of application of coating systems. Require attendance of parties directly affecting work of this section, including Contractor, Engineer, applicator, and manufacturer’s representative. Review the following:

1. Environmental requirements.

2. Protection of surfaces not scheduled to be coated.

3. Surface preparation.

4. Application.

5. Disinfections.

6. Repair.

7. Field quality control.

8. Cleaning.

9. Protection of coating systems.

10. One-year inspection.

11. Coordination with other work.

1. D. Provide Manufacture 15-year warranty against color and gloss The exterior finish shall not exhibit loss of gloss in excess of 24 units as measured by a gloss meter in accordance with ASTM D523-89 with 60 degree geometry.

Coating System 3

1.7 DELIVERY, STORAGE, AND HANDLING

A. Delivery: Deliver materials to site in manufacturer's original, unopened containers and packaging, with labels clearly identifying:

1. Coating or material name.

2. Manufacturer.

3. Color name and number.

4. Batch or lot number.

5. Date of manufacture.

6. Mixing and thinning instructions.

B. Storage:

1. Store materials in a clean dry area and within temperature range in accordance with manufacturer's instructions.

2. Keep containers sealed until ready for use.

3. Do not use materials beyond manufacturer’s shelf life limits.

C. Handling: Protect materials during handling and application to prevent damage or contamination.

1.8 ENVIRONMENTAL REQUIREMENTS

A. Weather:

1. Air and Surface Temperatures: Prepare surfaces and apply and cure coatings within air and surface temperature range in accordance with manufacturer’s instructions.

2. Surface Temperature: Minimum of 5 degrees F (3 degrees C) above dew point.

3. Relative Humidity: Prepare surfaces and apply and cure coatings within relative humidity range in accordance with manufacturer’s instructions.

4. Precipitation: Do not prepare surfaces or apply coatings in rain, snow, fog, or mist.

5. Wind: Do not spray coatings if wind velocity is above manufacturer’s limit.

B. Ventilation: Provide ventilation during coating evaporation stage in confined or enclosed areas in accordance with AWWA D 102.

C. Dust and Contaminants:

1. Schedule coating work to avoid excessive dust and airborne contaminants.

2. Protect work areas from excessive dust and airborne contaminants during coating application and curing.

3. Prior to exterior painting the tank shall be completely contained with an SSPC Class 1 enclosure to prevent local contamination with blast media, dust, and coating over-spray. The Contractor shall control temperature, relative humidity, and dust levels within the enclosure to meet the coating manufacturer’s recommended limits during surface preparation and painting operations.

Coating System 4

PART 2 PRODUCTS

2.1 MANUFACTURER

Tnemec Company, Inc., is listed as the standard of excellence. Substitutions shall be considered but must be approved by Engineer prior to bid deadline. Offers for substitutions will not be considered which decrease film thickness, solids by volume or the number of coats to be applied or which propose a change from the generic type of coating specified herein. All substitutions shall include complete test reports to comply with specified performance criteria. Paint application shall be in strict accordance with manufacturer's printed instructions except that coating thickness specified in paint schedule herein shall govern.

2.2 COATING SYSTEMS PERFORMANCE

Interior Coating

Coating manufacturer shall submit certified documentation that interior coating in contact with potable water has been certified in accordance with the National Sanitation Foundation Standard No. 61. Meets zinc-rich primer requirements of AWWA D102-03 Standard for Inside System No. 5 and Outside system No.6.

A. Galvanic Protection:

Method: Primer applied to SSPC SP10 Near White Blast Clean hot rolled carbon steel.

Requirement: The average measured potential of primer is -878 mille-volts.

B. Adhesion:

Method: ASTM D 4541(TTM-34) Type V Positester Requirement: Not less than 2,083 psi (14.36 MPa) adhesion, average of three trials.

C. Prohiesion Method: TTM-80 Prohiesion Cabinet Testing.

Requirement: No blistering, cracking, rusting or delamination of film. No more than 1/64” creepage at scribe after 15,000 hours.

Exterior Coating

Primer:

A. Same as interior performance for primer

Finish A. ASTM D 1014 (AAMA 2604-98). South Florida marine exposure.

Series 700 HydroFlon exceeds the exterior weathering requirements of the American Architectural Manufacturers Association (AAMA) 2604-98 standard.

B. Per ASTM D4141, Method C (EMMAQUA) No blistering, cracking or chalking. No less than 98% gloss retention, no more than 1 unit gloss loss and no more than 0.18 DEHunter color change after 2,000 MJ/m2 (88,095 MJ/m2 total) EMMAQUA exposure.

C. Per ASTM D4141, Method C (EMMAQUA):

No blistering, cracking or chalking. No less than 84% gloss retention, no more than

Coating System 5

13 units gloss loss and no more than 0.41 DEHunter color change after 3,500 MJ/m2 (128,951 MJ/m2 total) EMMAQUA exposure.

2.4 COATING SYSTEM FOR EXTERIOR STEEL

Exterior Field – (**NOTE Below) A. Primer: All blasted areas shall receive one coat of Tnemec Series 91H2O or 94H20 at

2.5 to 3.5 mils dry film thickness.

B. Stripe Coat: Brush and or roller apply Tnemec Series 27FC at 3-5 mils on all outside corners including flanges, brackets, supports, ladder rungs, welds, laps, edges. Include nuts, bolts and any other irregular surfaces.

C. Intermediate Coat: Tnemec Series 1095 EnduraShield at 3 to 5 mils dry film thickness.

D. Finish Coat: Tnemec Series 701 at 2 to 3 mils dry film thickness

Minimum dry film thickness shall be 7.5 mils non-stripe coated areas and 10.5 mils on stripe coated areas.

**NOTE: Number of coats shown above are based on spray application. If applied by roller or brush, additional coats may be necessary to achieve the required film thicknesses and satisfactory hiding with the finish color.

2.5 ACCESSORIES

A. Coating Application Accessories:

1. Accessories required for application of specified coatings in accordance with manufacturer’s instructions, including thinners.

2. Products of coating manufacturer.

PART 3 EXECUTION

3.1 EXAMINATION

A. Examine areas and conditions under which coating systems are to be applied. Notify Engineer of areas or conditions not acceptable. Do not begin surface preparation or application until unacceptable areas or conditions have been corrected.

3.2 PROTECTION OF SURFACES NOT SCHEDULED TO BE COATED

A. Protect surrounding areas and surfaces not scheduled to be coated from damage during surface preparation and application of coatings.

B. Immediately remove coatings that fall on surrounding areas and surfaces not scheduled to be coated.

Coating System 6

3.3 SURFACE PREPARATION OF STEEL

A. Prepare steel surfaces in accordance with manufacturer’s instructions.

3.4 SURFACE PREPARATION (SHOP)

B. Exterior Metal Surfaces:

All surfaces shall be sandblasted in strict accordance with SSPC SP6 Commercial Blast Cleaning.

3.5 SURFACE PREPARATION (FIELD)

A. Exterior Metal Surfaces:

All welded and abraded areas shall receive a blast cleaning in accordance with SSPC SP10 Near White Blast Cleaning.

B. Fabrication Defects:

1. Correct steel and fabrication defects revealed by surface preparation.

2. Remove weld spatter and slag.

3. Round sharp edges and corners of welds to a smooth contour.

4. Smooth weld undercuts and recesses.

5. Grind down porous welds to pinhole-free metal.

6. Remove weld flux from surface.

C. Ensure surfaces are dry.

D. Interior: Remove visible oil, grease, dirt, dust, mill scale, rust, paint, oxides, corrosion products, and other foreign matter in accordance with SSPC-SP 10/NACE 2.

E. Exterior: Remove visible oil, grease, dirt, dust, mill scale, rust, paint, oxides, corrosion products, and other foreign matter in accordance with SSPC-SP 6/NACE 2.

F. Abrasive Blast-Cleaned Surfaces: Coat abrasive blast-cleaned surfaces with primer before visible rust forms on surface. Do not leave blast-cleaned surfaces uncoated for more than 8 hours.

3.6 APPLICATION

A. Apply coatings in accordance with manufacturer's instructions.

B. Mix and thin coatings, including multi-component materials, in accordance with manufacturer’s instructions.

C. Keep containers closed when not in use to avoid contamination.

D. Do not use mixed coatings beyond pot life limits.

E. Use application equipment, tools, pressure settings, and techniques in accordance with manufacturer’s instructions.

Coating System 7

F. Uniformly apply coatings at spreading rate required to achieve specified DFT.

G. Apply coatings to be free of film characteristics or defects that would adversely affect performance or appearance of coating systems.

H. Stripe paint with brush critical locations on steel such as welds, corners, and edges using specified epoxy finish coat.

3.7 REPAIR

A. Damaged Materials: Repair or replace damaged materials and surfaces not scheduled to be coated.

B. Damaged Coatings: Touch-up or repair damaged coatings. Touch-up of minor damage shall be acceptable where result is not visibly different from adjacent surfaces. Recoat entire surface where touch-up result is visibly different, either in sheen, texture, or color.

C. Coating Defects: Repair in accordance with manufacturer’s instructions coatings that exhibit film characteristics or defects that would adversely affect performance or appearance of coating systems.

3.8 FIELD QUALITY CONTROL

A. Inspector’s Services:

1. Verify coatings and other materials are as specified.

2. Verify surface preparation and application are as specified.

3. Verify DFT of each coat and total DFT of each coating system are as specified using wet film and dry film gauges.

4. Coating Defects: Check coatings for film characteristics or defects that would adversely affect performance or appearance of coating systems.

a. Check for holidays on interior steel immersion surfaces using holiday detector.

5. Report:

a. Submit written reports describing inspections made and actions taken to correct nonconforming work.

b. Report nonconforming work not corrected.

c. Submit copies of report to Engineer and Contractor.

B. Manufacturer’s Field Services: Manufacturer’s representative shall provide technical assistance and guidance for surface preparation and application of coating systems.

3.9 CLEANING

A. Remove temporary coverings and protection of surrounding areas and surfaces.

3.10 PROTECTION OF COATING SYSTEMS

A. Protect surfaces of coating systems from damage during construction.

3.11 ONE-YEAR INSPECTION

A. Owner will set date for one-year inspection of coating systems.

Coating System 8

B. Inspection shall be attended by Owner, Contractor, Engineer, and manufacturer’s representative.

C. Repair deficiencies in coating systems as determined by Engineer in accordance with manufacturers instructions.

PART 4 GENERAL

4.1 CONTRACTOR GUARANTEE

A ten (10) year guarantee which commences on the date of acceptance against failure of all coatings shall be provided. Failure of any coating during the guarantee period shall be repaired by the Contractor who shall absorb all costs related to the repair of the coating.

4.2 RIGHT OF REJECTION

The Owner shall have the right to reject all material or work that is unsatisfactory, and require the replacement of either or both at the expense of the Contractor.

4.3 PROTECTION OF WORK

The Contractor shall be responsible for any and all damage to his work or the work of others during the time his work is in progress.

END OF SECTION