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Water Tank Inspection Standards &

GuidelinesPenni Snodgrass

Sales and Marketing ManagerTank Industry Consultants

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American Water Works Association

(AWWA)

National Fire Protection

Association

(NFPA)

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AWWA D101-53 (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First Edition – 1953 Reaffirmed without revision in 1986 Withdrawn – December, 1998 Currently undergoing complete revision

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AWWA D101Inspection of Water Tanks and

Related Facilities

Committee Chair – Chip Stein, TIC

How AWWA Standards are Developed

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AWWA Standards are not…

Specifications Endorsement Recommendation

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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”)

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AWWA Standards are…

Guidelines Solid Base Frequently cited in project specifications A reliable source of information

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Standards-Making Process

Standards Committee

Producer Group Consumer Group General Interest

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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

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Standards Council

Publish

CommitteeConsensus

PublicReview and Comment

ExecutiveCommittee

Five-Year Review/Revision

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What’s Happening in the D101 Committee??

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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

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Proposed Foreword

Stated Purpose of Standard Asset Management Approach Goal of Sustainability References to C652, D100, D102, D103,

D107, D110

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Proposed Section AElements of Facilities

Nomenclatures Elements

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Proposed Section BInspection of New Construction

Soils/Geotech Documentation/Work-In-Process Evaluation

Reporting Inspections specific to type of construction

♦Welding♦Concrete Placement♦Coatings

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Proposed Section CInspection of Existing Structures

Frequency Coatings Structural Sanitary Safety Tank and Site Security Reporting Requirements

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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

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Accessories

Cathodic Protection Mixing Systems

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Proposed Section DInspection 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

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Proposed Section EFirst Anniversary Evaluation

Minimum requirements for how this evaluation should be conducted and reported Type – Drained, ROV, Dive Disinfection Reporting

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Proposed Section FQualifications

Engineering Firm♦Experience♦Insurance♦Licensed Engineer

Inspector♦Experience♦Climbing Ability♦Association Certifications (NACE, SSPC)

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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

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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

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Steel Water Storage Tanks

Published by McGraw Hill in conjunction with AWWA

Technical Editor – Steve Meier Chapter Author – Chip Stein Chapter Author – Jennifer Coon

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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

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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)

Questions?

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