Water Tank Inspection Standards & Guidelines

Transcription

1 Water Tank Inspection Standards & Guidelines Penni Snodgrass Sales and Marketing Manager

2 American Water Works Association (AWWA) National Fire Protection Association (NFPA)

3 AWWA D (retired) Inspecting and Repairing Steel Water Tanks, Standpipes, Reservoirs, and Elevated Tanks, for Water Storage First Edition 1953 Reaffirmed without revision in 1986 Withdrawn December, 1998 Currently undergoing complete revision

4 AWWA D101 Inspection of Water Tanks and Related Facilities Committee Chair Chip Stein, TIC

5 How AWWA Standards are Developed

6 AWWA Standards are not Specifications Endorsement Recommendation

7 Standards vs Specs Standards - minimum technical requirements ( i.e. the what ) Specifications the contractual relationships ( i.e. when and by whom and through standards and supplemental requirements the what )

8 AWWA Standards are Guidelines Solid Base Frequently cited in project specifications A reliable source of information

9 Standards-Making Process Standards Committee Producer Group Consumer Group General Interest

10 Standards-Making Process Committee Consensus Sent to Standards Council, if approved Published for Review and Comment Sent to Executive Committee Published start the process all over

11 Committee Consensus Standards Council Five-Year Review/Revision Publish Public Review and Comment Executive Committee

12 What s Happening in the D101 Committee??

13 Types of Structures Clearwells Concrete Tanks Bolted Tanks Membrane Covered Reservoirs Stainless Steel Tanks (bolted and welded) Filter Beds Hydropneumatic Tanks (operating at less than 15 psi) Clarifiers Current Market Demand

14 Proposed Foreword Stated Purpose of Standard Asset Management Approach Goal of Sustainability References to C652, D100, D102, D103, D107, D110

15 Proposed Section A Elements of Facilities Nomenclatures Elements

16 Proposed Section B Inspection of New Construction Soils/Geotech Documentation/Work-In-Process Evaluation Reporting Inspections specific to type of construction Welding Concrete Placement Coatings

17 Proposed Section C Inspection of Existing Structures Frequency Coatings Structural Sanitary Safety Tank and Site Security Reporting Requirements

18 Inspection Methods Underwater Tank Evaluation In-Service Cleaning, as it relates to the inspection of the structure Rafting Commentary Checklist - advantages and disadvantages of Dive, ROV, and Drained Methods Commentary - Owner Specify Motivation for having Tank Inspected

19 Accessories Cathodic Protection Mixing Systems

20 Proposed Section D Inspection of Existing Tank Rehabilitation Submittal Review Appurtenance and Welding Repairs Repairs Surface Preparation Emission and Overspray Containment Air Monitoring Environmental and Personnel Air Safety Coating Application Ventilation during Coating Application Documentation/Work-In-Process Evaluation Reporting Punch Lists

21 Proposed Section E First Anniversary Evaluation Minimum requirements for how this evaluation should be conducted and reported Type Drained, ROV, Dive Disinfection Reporting

22 Proposed Section F Qualifications Engineering Firm Experience Insurance Licensed Engineer Inspector Experience Climbing Ability Association Certifications (NACE, SSPC)

23 Proposed Appendices Bibliography Organizations Cold Weather Operation of Water Tanks Cellular Antennas Considerations Site Selection Tank Style Analysis Tank Sizing Considerations Sample Inspection Forms Inspection Certifications and Associations Commentary

24 AWWA M42 Steel Water-Storage Tanks First Edition 1988 Latest Revision 2012 Frequency (3 to 5 years) Inspector Qualifications Inspection Scope AWWA D101 Referenced in Appendix C Revision Chair, Chip Stein, TIC

25 Steel Water Storage Tanks Published by McGraw Hill in conjunction with AWWA Technical Editor Steve Meier Chapter Author Chip Stein Chapter Author Jennifer Coon

26 NFPA 25 (2017) Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems Frequency Daily Heating System Weekly Water Temperature Monthly Water Level Quarterly Tank Exterior, Support Structure, Catwalks/Balconies, Ladders, Site Annually Expansion Joints, Coatings Interiors 3 years vs 5 years

27 NFPA and AWWA Differences Frequency Site Evaluation (combustible storage, brush, fire exposure hazard) NFPA addresses all types of tank construction NFPA requirements not found in AWWA Holiday Detection Underbottom Ultrasonic Testing (or Coupon Removal) Vacuum-Box Testing of Floors (NFPA 22)

28 Questions?