WATER STORAGE TANKS: INSPECTION METHODS
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1 WATER STORAGE TANKS: INSPECTION METHODS
2 Service Trucks
3 Would could go wrong? H2 Gas build-up
4 Tank Failure: 300,000 gal Auburn, MA Sidewall failure due to corrosion
5 Water Tank Styles & Design Issues:
6 Leg Tank
7 Single Pedestal
8 Fluted Column
9 Composite Elevated
10 Standpipe
11 Reservoir or Ground Storage
12 Bolted Tanks
13 Redwood Tank
14 Other Tanks
15 Leg Tank
16 House Tank
17 EFFECTIVE TANK CONDITION ASSESSMENT OVERVIEW AWWA STANDARDS WHY INSPECT? SELECTING AN INSPECTOR WHAT TO INSPECT INSPECTION FREQUENCY INSPECTION TYPES
18 AWWA Standards AWWA D100 Welded steel tanks for water storage AWWA D102 Coating steel water storage tanks AWWA C652 Disinfection of water storage facilities AWWA G Distribution Systems Operation and Management AWWA C Field Dechlorination 15
19 WHY INSPECT?
20 WHY INSPECT? AWWA M42 (1998): Chapter 9 A good, comprehensive preventive maintenance program can extend the life of an existing tank indefinitely.
21 WHY INSPECT? AWWA M42 (1998): Chapter 9 Many thousands of dollars can be saved and complaints from citizens can be eliminated if a planned approach to tank maintenance is adopted.
22 WHY INSPECT? AWWA Steel Water Storage Tanks (2010) Chapter 10, Page 381: Why have a maintenance program? The answer is simple: Preventive maintenance has been, and always will be, less expensive than crisis maintenance.
23 WHY INSPECT? DETERMINATION OF MAINTENANCE NEEDS FOR ONE OF THE WATER SYSTEMS MOST VALUABLE ASSETS: SANITARY CONDITIONS STRUCTURAL CONDITIONS SAFETY CONDITIONS COATINGS CONDITIONS SECURITY CONDITIONS
24 HOW TO SELECT AN INSPECTOR? Only organizations and individuals that are qualified and equipped to do the work should do inspections. Ask for qualifications of inspectors Request sample inspection reports Request adequate insurance certificates
25 INSPECTION CONTRACTS: Require a written contract that defines the scope of the inspection: should cover all (6) general categories provide for pressure relief valves, or portable potable pressure tanks, and all other equipment necessary to conduct a safe and thorough inspection state method of disinfection State method of field de-chlorination furnish insurance certificates naming tank owner as an additional insured
26 INSPECTION REPORTS: Report should include quality videotapes or color photographs documenting findings Report should be detailed and cover conditions under all (6) categories Report on all conditions NOT just deficiencies Provide recommendations and cost estimates
27 OWNER NOTIFICATION: Any sanitary defect, contamination, safety hazard or serious structural damage found should be reported at the time of the inspection so the facility owner can have them corrected immediately.
28 WHAT TO INSPECT: Six general categories of items on storage facilities that must be inspected: Structural Conditions Safety Conditions Sanitary Conditions Coating Systems Conditions Security Conditions General Details
29 Sanitary Conditions Roof Openings Access Hatches Low Spots on Roofs Vents Overflows
30 Sanitary Conditions: Roof Openings
31 Sanitary Conditions: Roof Openings
32 Sanitary Conditions: Roof Openings
33 Sanitary Conditions: Roof Openings
34 Sanitary Conditions: Roof Openings
35 Sanitary Conditions: Roof Openings
36 Sanitary Conditions: Roof Openings
37 Sanitary Conditions: Roof Openings
38 Sanitary Conditions: Roof Openings
39 Sanitary Conditions: Roof Openings
40 Sanitary Conditions: Access Hatches
41 Sanitary Conditions: Access Hatches
42 Sanitary Conditions: Access Hatches
43 Sanitary Conditions: Access Hatches
44 Sanitary Conditions: Access Hatches
45 Sanitary Conditions: Low Spots on Roof
46 Sanitary Conditions: Vents
47 Sanitary Conditions: Vents
48 Sanitary Conditions: Vents
49 Sanitary Conditions: Vents
50 Sanitary Conditions: Vents
51 Sanitary Conditions: Vents
52 Sanitary Conditions: Vents
53 Sanitary Conditions: Vents
54 Sanitary Conditions: Vents
55 Sanitary Conditions: Vents
56 Sanitary Conditions: Vents
57 Sanitary Conditions: Vents
58 Sanitary Conditions: Vents
59 Sanitary Conditions: Secure Vent
60 Sanitary Conditions: Overflows
61 Sanitary Conditions: Overflows
62 Sanitary Conditions: Overflows
63 Sanitary Conditions: Overflows
64 Sanitary Conditions: Overflows
65 Sanitary Conditions: Overflow
66 Overflow pipe full of dead birds
67 Sanitary Conditions: Overflows
68 Safety Conditions Regulations Appurtenances Ladders Fall Prevention Handrails Access Confined Space Radiation
69 Safety Conditions: Regulations OSHA (Occupational Safety and Health Administration) 29 CFR 1910: General Industry 29 CFR 1926: Construction Industry
70 Safety Conditions: Fixed Ladders 29 CFR Minimum design load of 200 lbs. 12 in. rung distance 16 in. minimum side rail distance 7 in 15 in. toe clearance degree pitch 15 in. clearance from centerline 30 in. headroom
71 Safety Conditions: Fall Prevention 29 CFR A fall protection system must be used when working 6 feet or more above a lower level Systems include Guardrail Systems Safety Net Systems Personal Fall Arrest Systems Positioning Device Systems Warning line Systems
72
73 Top Handrail should be 42 (+ or 3 ) to the top of the rail Mid Handrail should be 21 or midway between the toprail and the platform /2 21 Toeboard should be minimum 3 1/2
74 Safety Conditions: Fall Prevention
75 Safety Conditions: Fall Prevention
76 Safety Conditions: Fixed Ladders
77 Safety Conditions: Fixed Ladders
78 Safety Conditions: Fixed Ladders
79 Safety Conditions: Fixed Ladders
80 Safety Conditions: Fixed Ladders
81 Safety Conditions: Fixed Ladders
82 Safety Conditions: Fixed Ladders
83 Safety Conditions: Handrail Systems 29 CFR Handrail shall consist Top rail 42 tall (200 lb force) Toe board Intermediate rail No openings greater than 19 2 x2 x3/8 posts 8 intervals
84 Safety Conditions: Handrail Systems
85 Safety Conditions: Handrail Systems
86 Safety Conditions: Access 29 CFR Minimum of 22 Every building or structure. the blocking of any single means of egress due to fire or smoke, shall have at least two means of egress remote from each other,
87 Safety Conditions: Access AWWA D100 Section 7.1 Two manholes in the first ring of the tank shell Section manhole shall not be less than 12in.x18in. Section Opening above the water line Section Opening near the tank center shell manway may be substituted
88 Safety Conditions: Access
89 Safety Conditions: Access
90 FCC Issues Safety Conditions: Radiation Hazard Communications Safety Plan
91 Security Conditions: Threats Terrorist Acts Disgruntled Employees Pranks Environmental
92 Security Conditions
93 Security Conditions: Site Access
94 Security Conditions
95 Security Conditions
96 Security Conditions
97 Security Conditions
98 Security Conditions
99 Security Conditions: Bullet Hole
100 Structural Conditions Anchor bolts Foundations Wind rods Riser/Shell steel Spider Rods Roof Trusses Weld Seams
101 Structural Conditions: Anchor Bolts
102 Structural Conditions: Anchor Bolts
103 Structural Conditions: Foundations
104 Structural Conditions: Wind Rods
105 Structural Conditions: Wind Rods
106 Structural Conditions: Spider Rods
107 Structural Conditions: Roof Trusses
108 Structural Conditions: Roof Trusses
109 Structural Conditions: Roof Trusses
110 Structural Conditions: Roof Trusses
111 Structural Conditions: Roof Trusses
112 Structural Conditions: Roof Trusses
113 Structural Conditions: Roof Trusses
114 Structural Conditions: Roof Trusses
115 Structural Conditions: Weld Seams
116 Coatings Conditions Generic type and general condition Approximate percentage and type of coatings system failure Adhesion Coating System Thickness Extent of Pitting Damage Heavy Metal Presence
117 Coatings Conditions
118 Coatings Conditions
119 Coatings Conditions
120 Coatings Conditions
121 Coatings Conditions
122 Coatings Conditions
123 Coatings Conditions
124 Coatings Conditions
125 Coatings Conditions
126 Coatings Conditions
127 Coatings Conditions
128 Coatings Conditions
129 Coatings Conditions
130 Coatings Conditions
131 Coatings Conditions
132 Coatings Conditions
133 Sediment Removal
134 Sediment Removal
135 Sediment Removal
136 Sediment Removal
137 INSPECTION FREQUENCY AWWA M42: The maximum interval for periodic inspections of the tank interior should normally be 3 years. It is usually advisable to wash out the tank at the time of inspection. Page 67
138 ROV Inspection Device
139 INSPECTION FREQUENCY AWWA M42: proper inspections cannot be conducted if sediment covers the bottom of the tank. Tanks should be washed out and inspected at least every 3 years, and where water supplies have sediment problems, annual washouts are recommended. Page 88
140 TYPES OF INSPECTIONS Routine: daily/weekly Periodic: monthly/quarterly Comprehensive: 3-5 years
141 Types Of Inspections AWWA G Distribution Systems Operation and Management, Section states: The utility shall have a written inspection program outlining frequency, procedures and maintenance of records. The inspection program shall include such features as routine (daily/weekly); periodic (monthly/quarterly); and comprehensive (3-5 years) inspections.
142 EFFECTIVE TANK CONDITION ASSESSMENT SUMMARY AWWA STANDARDS WHY INSPECT? SELECTING AN INSPECTOR WHAT TO INSPECT INSPECTION FREQUENCY INSPECTION TYPES
143 What Robotics offers Lower Cost Lower Risk Time savings Tanks remain ONLINE and Operational
144 Robots vs. Divers Decisions men make Liability/Safety Time efficiency
145
146 What do we inspect? Sediment What depth of sediment should be cleaned?
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149 What do we inspect? Sediment Tank Structure Floors: Tell a bigger story than simply how dirty it is
150
151
152 What do we inspect? Sediment Tank Structure Ceilings Concrete problems / Steel tank problems
153 What do we inspect? Sediment Tank Structure Floors Ceilings Pipes, ladders, columns, hatches, vents and screens
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157 What do we inspect? Sediment Tank Structure Floors Ceilings Pipes, ladders, columns, hatches, vents and screens Cathodic protection and less metal in tanks
158
159 What do we inspect? Sediment Tank Structure Floors Ceilings Pipes, ladders, columns, hatches, vents and screens Cathodic protection and less metal in tanks Specific Requests...
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165 Common Problems Need to cut locks due to lost keys Structure failure Coating failures
166
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168 Common Problems Need to cut locks due to lost keys Structure failure Coating failures Concrete cracks
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178 Common Problems Need to cut locks due to lost keys Structure failure Coating failures in steel tanks Concrete cracks Animals Hatch minimums & other tank designs
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182 Wrap Up Robotic Solution = Lower Cost Lower Risk Time savings Tanks remain ONLINE and Operational
183 Chemical Cleaning for Water Storage Tanks Kevin Barnes Utility Service Co, Inc 15 Dec 2011
184 CHEMICAL CLEANING OF THE STORAGE TANK Removal of Bio-film from all tank surfaces: Reduces disinfectant demand Reduces risk of nitrification Reduces risk of DBP formation 2011 Utility
185 CHEMICAL CLEANING OF THE STORAGE TANK Washout inspection involves sediment removal and pressure washing of tank surfaces followed by disinfection in accordance with AWWA C652 Pressure washing and the disinfection process will NOT kill and remove the bio-film on interior tank surfaces Failure to remove the bio-film leaves a major source of disinfectant demand in the tank which simply regenerates during the summer months A low pressure NSF 60 certified chemical application can remove all biological growth from the tank as well as the mineral staining typically associated with the bio-film 2011 Utility
186 CHEMICAL CLEANING OF THE STORAGE TANK In addition to the impact on disinfectant demand, bio-film and Fe/Mn stain removal makes inspection and repairs to failures in the coating much easier and more thorough Maintaining the integrity of the coating is vital and will minimize biological re-growth by eliminating those anchor sites where colonization occurs Our experience has shown a direct correlation between interior coating surface roughness and bio-film growth 2011 Utility
187 Organic Deposits on Tank Interior 2011 Utility
188 Organic Deposits on Tank Interior 2011 Utility
189 Bio Film on Tank Interior 2011 Utility
190 Bio-film in Storage Vessels 2011 Utility
191 CHEMICAL CLEANING OF THE STORAGE TANK PRESSURE WASHING ALONE WILL NOT REMOVE BIO-FILM, which is an ongoing source for chlorine consumption and DBP production 2011 Utility Service Company, Inc.
192 Bio-film removal process Before During 2011 Utility After
193 Bio-film Removal 2011 Utility
194 Bio-film Removal 2011 Utility
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