water tank inspections and coatings · 2018-04-03 · insure sanitary conditions of the tank...
TRANSCRIPT
Water Tank Inspections and Coatings
Presented by Bob Radwan
Core Industrial LLC
AGENDAIntroductionTank DesignsSanitaryStructuralSafetySecurityCoatings
Insure sanitary conditions of the tank
Provide for short-term and long-term planning
Determine scope of work for renovation
After major events.
Powerful storms
Major line breaks that cause sudden emptying of tanks.
Unauthorized access of tank or tank sites.
Obvious signs of compromised sanitary conditions.
Why?- Inspect your tank
Leg Tank
Single Pedestal
Fluted Column
Composite Elevated
Standpipe
Ground Storage
Riveted TanksShotgun or Witch Hat
Glass Line Tank
Foundation Problems
Incompatible coating systems
Not protecting concrete foundation
Antenna installs
Safety liability
Costly Tank Issues
Don’t Let a Small Problem Become a BIG ONE….
Five general categories of items on storage facilities that mustbe inspected: Sanitary Conditions
Structural Conditions
Safety Equipment Conditions
Coating Systems Conditions
Security
Technical Guidance: Inspection Items
Inspection Frequency
Washout Inspection
AWWA M42 “Tanks should be washed out and inspected at least once every 3 years, and where water supplies have sediment problems, annual washouts
are recommended.”
Roof Openings
Access Hatches
Low Spots
Vents
Overflows
Cleanouts or Hydrants
Sanitary Conditions
Sanitary Conditions
Sanitary Conditions
Sanitary Conditions
Sanitary Conditions
Sanitary Conditions
Sanitary Conditions
Roof Openings
Sanitary Conditions
Access Hatches
Low Spots
Vents
Vents
Vents
Vents
Vents
Vents
Overflows
Overflows
Overflows
Foundations
Anchor Bolts
Anchor Bolts
Wind Rods
Wind Rods
Regulations
Appurtenances Ladders
Fall Prevention
Handrails
Access
Confined Space
Radiation
Safety Equipment Conditions
OSHA (Occupational Safety and Health Administration)
29 CFR 1910
29 CFR 1926
Regulations
Fixed Ladders
Fixed Ladders
Interior Ladder
Security Issues
Security Issues
Security Conditions
Coating SystemsYou get what you pay for!
Coating Systems
Coating Systems
Coating Systems
Coating Systems
Coating System
Coating System
Ice Damage to Tank Shell
Structure
Drive-byTwice per week
Walk Around
Once/twice per month
Visual Inspection
Annual
ROV Inspection
Diver Inspection
Dry Inspection
2-3 years
Inspection Frequency
ROV Inspection
Diver Inspection
Standards and Guides
- AWWA D-100-11 – Welded Carbon Steel Tanks for Water Storage
- AWWA D-102-14 – Coating Steel Water Storage Tanks
- SSPC – The Society for Protective Coatings (Steel Structures Painting Council)
- NACE – National Association of Corrosion Engineers
- ANSI, NSF, UL, EPA, OSHA, etc.
- State and Local Regulations
ENVIRONMENTAL STANDARDS AND REGULATIONS
- VOC’s (Volatile Organic Compounds)
- HAP’s (Hazardous Air Pollutants)
- NSF/ANSI International Std. 61
Specification ConsiderationsEnvironmental ConditionsTime of yearAbility to take out of service
Site ConsiderationsCoastalIndustrial Surrounding Properties
Desired Life Expectancy Difficulty to PaintRedundancy
Surface Preparation StandardsMost Common Blast Standards
- SSPC-SP5/NACE 1 White Metal Blast-Removal of everything. 0% Staining allowed
- SSPC-SP10/NACE 2 Near White Metal Blast-Removal of everything. 10% Staining allowed
- SSPC-SP6/NACE 3 Commercial Blast-Removal of everything. 33% Staining allowed
- SSPC-SP7/NACE 4 Brush-Off Blast-Removal of all LOOSE debris, paint, rust, etc.
FULL FIELD SURFACE PREPARATION
- Imparts angular vs. peened surface profile
- Eliminate oils, greases, mud and other contaminants on the surface from fabrication, transportation and job site staging prior to coating
- Eliminates carbon deposits left from blasting with steel abrasive
- Prime coats becoming hardened and chalked due to extended exposure to UV
Blast Media
Shop Blasted and Primed Tank
SEAM TREATMENT
