More than Just Paint TEXAS PUBLIC WORKS ASSOCIATION AUSTIN, TEXAS

Transcription

1 More than Just Paint TEXAS PUBLIC WORKS ASSOCIATION AUSTIN, TEXAS Charles Kucherka, P.E. June 25, 2015

2 Tank Rehabilitation Pre Design 30% Submittal 90% Submittal Bid and Construction Phases

3 Pre Design TCEQ Annual Reports Active Engineering Experienced Inspector Looking for: Regulatory Requirements Structural Condition Capacity of Appurtenances Existing Coatings Site Challenges

4 Pre Design Regulatory Requirements TCEQ or State Agency Is Rehab. Maintenance? AWWA OSHA? Ladders Hatches Confined Space Entry

5 Pre Design Structural Condition and Capacities Structural Condition Capacities Vents Overflows

6 Pre Design Existing Coatings Type of Coatings Condition Assessment

7 Pre Design Soils and Coatings with Heavy Metals Lead, Cadmium and Chromium Lead 5,000 PPM or 0.5% by weight OSHA Lead Paint Total Lead TCLP Test Soils SPLP Test Sampling Plan Prevailing Winds Drainage Patterns Manways

8 Pre Design Site and Construction Challenges Space for Construction Surrounding Structures OHE Pump Stations & Facilities

9 Coating & Rehab Specifications The Basics Choose Your Words Wisely If you want it, specify it Reference Standards Specifically Meetings and Schedules Inspection Owner Standardization

10 Design Specifications Coatings AWWA D102 Standard for Coating Steel Water Storage Tanks Interior & Exterior Systems Best? Project Goals Budget? Coating Manufacturers Specify: Coating by Name and Manufacturer Minimum & Maximum Mils per Coat Color (contrasting) Logos

11 Design Specifications Surface Preparation How clean the steel is Typical for Rehabs NACE No. 2/SSPC SP 10, Near White Metal Blast Cleaning NACE No. 3/SSPC SP 6, Commercial Blast Cleaning SSPC SP 3, Power Tool Cleaning Weld Preparation Abrasives

12 Specifications Containment/Dehumidification SSPC Technology Guide 6 Guide for Containing Surface Prepartion Debris Generated During Paint Removal Operations TCEQ 30 TAC Chapter Abrasive Blasting of Water Storage Tanks Performed by Portable Operations Job Specific and Must be Specified Ventilation Dehumidification

13 Construction Soils and Coatings with Heavy Metals SSPC Technology Update No. 7 Sampling During Construction Sampling Protection During Construction Post Construction SSPC Technology Guide No. 7 Disposal Chain of Custody

14 Bid Form Expect the Unexpected Supplementary Items Rafter Replacement Floor Plate Replacement Grinding Pit Filling Seam Welding Misc. Steel (ton)

15 Design Away from Corrosion Avoid Skip Welding Inaccessible or hard to reach areas Gaps Overlaps (roof plates) Angles Dissimilar Metals API 653 Tank Insp., Repair

16 Design Antennas & Electrical SCADA & Communication Conduit Routing

17 Design Cathodic Protection AWWA Standard D104 NACE SP0388 Cathodic Protection for Water Storage Tanks Coordinate with Owner Performance Specification

18 Construction Inspection Small Things Big Problems Coatings failures and the corrosion that follows can: Cost money..a lot of it. Cause structural failures Accelerate maintenance schedules Special Training NACE Coating Inspector Program How Often Resident Representation Hold Point Inspection

19 Construction Inspection Environmental Testing Inspector should be checking: No. 1 and No. 2 Substrate Surface & Ambient Air Temperature Relative Humidity & Dew Point Wind Speed Sound Level Meter? How Often? Tools Thermometer (Infrared or Magnetic) Digital Hydrometer or Sling Psychrometer Wind Speed Monitor Digital Sound Level Meter

20 Construction Inspection Surface Prep. and Profile Inspector should be checking: Prepared steel per SSPC/NACE level specified Anchor Profile Weld Preparation Steel Conditions Tools SSPC VIS 1 Dry Abrasive Blast Cleaning SSPC VIS 3 Hand and Power Tool Cleaning NACE SP0178 Plastic Weld Comparator Replica Tape or Digital Profile Gauge

21 Construction Inspection Coating Application Weather and Changes Temperature Coatings and Thinners Environmental Controls Application Method Inspector should be: Verifying coatings Documenting lot numbers Verifying wet mils Tools Wet Film Thickness Gauge Dry Film Thickness Gauge

22 Construction Inspection Final SSPC PA 2 Measurement of Dry Coating Thickness with Magnetic Gages Total Dry Film Thickness Inspector should: Document Holidays Document Mil Readings Tools Dry Film Thickness Gauge Holiday Tester Cathodic Protection

23 THANK YOU! Charles Kucherka, P.E. Freese and Nichols, Inc. Phone: