J.2_Scott-Fac 8733-Post Repair-Final-2022.pdf
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About this file
This document is an API 653 Repair Inspection Report for Tank Number 33 at Scott Air Force Base, prepared by the US Army Corps of Engineers Omaha District on 25 May 2022. The comprehensive report details 21 specific repair and maintenance actions performed on the tank, including installing a new second bottom with cathodic protection, replacing spiral stairs, modifying water draw-off and piping systems, replacing thermal relief and grounding systems, installing new level alarms, providing stilling wells, and performing a hydrostatic test. The tank, constructed in 1952 and containing jet fuel (F-24), underwent extensive modifications to ensure its continued safe operation, with the inspection concluding that the tank is suitable to return to service. The next in-service inspection is scheduled for May 2027, with ultrasonic thickness measurements to occur in April 2035, in accordance with API 653 standards.
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US Army Corps of Engineers Omaha District
API 653 Repair Inspection Report – Final
Scott Air Force Base
Tank Number 33
US Army Corps of Engineers Center of Expertise for Petroleum, Oils and Lubricants
(USACE POL-MCX)
25 May 2022
Table of Contents
ACRONYMS AND ABBREVIATIONS
SUITABILITY FOR SERVICE MEMORANDUM
GENERAL TANK INFORMATION
TANK REPAIRS
1. Provide New Second Bottom
2. Remove and Replace Spiral Stairs
3. Remove and Replace Water Draw-Off System
4. Replace Thermal Relief System
5. Provide Scaffold Supports
6. Replace Grounding Systems
7. Provide Davit Arms
8. Add Mechanical Tape Gauge IFR Weight
9. Replace Roof Access Manway
10. Repair Roof Perimeter Inspection Hatches
11. Modify the Low Suction Line
12. Modify the Receipt Line
13. Modify the Issue Line
14. Replace Level Alarms
15. Provide Stilling Wells
16. Provide Pipe Product Labeling
17. Replace Pipe Crossover Stairs
18. Provide Tank Data Plate
19. Remove and Patch Tank Overflows
20. Perform Hydrostatic Test
21. Repair Coatings
APPENDIX A: BOTTOM PLATE THICKNESSES
APPENDIX B: ENGINEERING DRAWINGS
ACRONYMS AND ABBREVIATIONS
API
ASME
ASNT
ATG
American Petroleum Institute
American Society of Mechanical Engineers
American Society of Non-Destructive Testing
Automatic Tank Gauge
BBL Barrel
CFR Code of Federal Regulations
CP Cathodic Protection
DFT Dry Film Thickness
HLA High Level Alarm
HLCS High Level Control Shutoff
HHLA High-High Level Alarm
LLA Low Level Alarm
LLLA Low-Low Level Alarm
MFL Magnetic Flux Leakage
MT Magnetic Particle Testing
NACE National Association of Corrosion Engineers
NDT Non-Destructive Testing
NFPA National Fire Protection Association
PSI Pounds per Square Inch
PT Penetrant Testing
P/V Pressure/Vacuum
RP Recommended Practice
PST Product Saver Tank
RT Radiography Testing
TML Thickness Measurement Location
TRV Thermal Relief Valve
UFC Unified Facilities Criteria
UFGS Unified Facilities Guide Specifications
ULS Ultra-Low Sulfur
UT Ultrasonic Testing
VT Visual Testing
SUITABILITY FOR SERVICE
MEMORANDUM
STORAGE TANK NO. 33
Out-of-Service API 653 Tank Inspection and Repair
Contract No. W9128F-16-D-0028, Delivery Order No. W9128F21F0157 Scott Air Force Base, Illinois
Tank 33 was inspected 25 May 2022. An API 653 Repair Inspection was performed by Darrin Laughlin. This tank report is an Appendix to the original API 653 tank report.
On this date 25 May 2022, the tank is in suitable condition for return to service.
Mandatory Repairs
No mandatory repairs were required.
Other Repairs and Maintenance
1. Provide new second bottom
2. Remove and replace spiral stairs
3. Remove and replace water draw-off system
4. Replace thermal relief system
5. Provide scaffold supports
6. Replace grounding systems
7. Provide davit arms
8. Add mechanical tape gauge IFR weight
9. Replace roof access manway
10. Repair roof perimeter inspection hatches
11. Modify the low suction line
12. Modify the receipt line
13. Modify the issue line
14. Replace level alarms
15. Provide stilling wells
16. Provide pipe product labeling
17. Replace pipe crossover stairs
18. Provide tank data plate
19. Remove and patch tank overflows
20. Perform hydrostatic test
21. Repair Coatings
Inspection Intervals
The next In-Service Inspection should occur in 5 years (May 2027) and the next UT thickness measurements should occur in 12 years (April 2035) in accordance with API 653.
The next Out-of-Service inspection should occur in 10 years (May 2032) per API 653 to establish corrosion rates for the new tank bottom.
This storage tank suitability for service evaluation has been completed in accordance with the requirements of API Standard 653, 5th Edition, Addendum 2, May 2020.
Prepared by:
Darrin A Laughlin US Tank Inspection Manager AmSpec API 653 Certified Inspector No. 29230
GENERAL TANK INFORMATION
ITEM DESCRIPTION
Owner U.S. Air Force
Location Scott Air Force Base
Tank Number 33
State / Country Illinois / USA
City St. Clair County
Inspection Date 5/19/22
Tank Manufacturer Graver Tank and Manufacturing Co.
Design Standard API 12C (Assumed)
Date of Construction 1952
Tank Contents Jet Fuel (F-24)
Tank Diameter 35’ 0”
Shell Height 27’ 10”
Product Height 23’ 4”
Tank Capacity 4,238 Barrels
Foundation Concrete Ringwall
Construction
Bottom 5/16”-Inch Lap-Welded Carbon Steel Plate
Shell Five butt-welded shell courses
Floating Roof Petrex Aluminum Floating Pan
Fixed Roof Supported Cone Roof
Material
Bottom Unknown Carbon Steel
Shell Unknown Carbon Steel
Floating Roof Aluminum honeycomb
Fixed Roof Unknown Carbon Steel
Cathodic Protection Impressed Current
Interior Coating System Thin Film Epoxy
Exterior Coating System Epoxy/Polyurethane
Level Gauging Enraf ATG, Shand & Jurs Auto-gauge, 6” Vito water bottom probe, 8” manual gauge well
Overfill Protection High and High-High Level Alarms
Piping Receipt 8” Carbon Steel
Issue 10” Carbon Steel
Low Suction 4” Carbon Steel
Water Draw-Off 2”/1” Carbon Steel
Level Alarms Low-Low Level Alarm: 2’ 3-1/2” Low Level Alarm: 3’ 1-1/2" High Level Alarm: 21’ 2-1/2” High-High Level Alarm: 22’ 0-1/2”
Type of Internal Floating Roof Aluminum Honeycomb
TANK REPAIRS
1. Provide New Second Bottom
OBSERVATION: New second bottom installed with liner and cathodic protection.
2. Remove and Replace Spiral Stairs
OBSERVATION: New spiral stairs installed and grounded.
3. Remove and Replace Water Draw-Off System
OBSERVATION: New water draw-off piping and valves installed.
4. Replace Thermal Relief System
OBSERVATION: New thermal relief system installed on issue, receipt and low suction lines.
5. Provide Scaffold Supports
OBSERVATION: Scaffold cable supports installed.
6. Replace Grounding Systems
OBSERVATION: New grounding lugs installed.
7. Provide Davit Arms
OBSERVATION: Davit arms installed on shell manways.
8. Add Mechanical Tape Gauge IFR Weight
OBSERVATION: Mechanical tape gauge remains in place, and a weight was installed on the
IFR.
9. Replace Roof Access Manway
OBSERVATION: New roof access hatch installed.
10. Repair Roof Perimeter Inspection Hatches
OBSERVATION: New galvanized chains installed at mid-rail height.
11. Modify the Low Suction Line
OBSERVATION: Internal flange installed and low suction line tied into suction line.
12. Modify the Receipt Line
OBSERVATION: Internal flange installed, diffuser modified, supports replaced, and
13. Modify the Issue Line
OBSERVATION: Issue piping extended, anti-vortex plate installed, supports replaced.
14. Replace Level Alarms
OBSERVATION: New high, high-high, low and low-low level alarms installed.
15. Provide Stilling Wells
OBSERVATION: New 8” and 6” aluminum stilling wells installed.
16. Provide Pipe Product Labeling
OBSERVATION: New pipe product labeling installed within the containment area.
17. Replace Pipe Crossover Stairs
OBSERVATION: Pipe crossover stairs replaced with galvanized stairs.
18. Provide Tank Data Plate
OBSERVATION: New tank data plate was installed. Data Plate has yet to be mounted to the shell bracket.
19. Remove and Patch Tank Overflows
OBSERVATION: Overflows over stairs and shell nozzles removed and patched.
20. Perform Hydrostatic Test
OBSERVATION: Hydrostatic test was successfully performed after API 653 repairs were completed.
21. Repair Coatings
OBSERVATION: New internal coatings applied to roof, shell, bottom, and appurtenances.
External coatings touched up as needed.
APPENDIX A: BOTTOM PLATE THICKNESSES
Plate Number Plate Locations Plate
Type Nominal Thicknes
Point Number
1 2 3 4 5
1 Sketch A 0.3125 0.313 0.317 0.315
2 Sketch E 0.3125 0.315 0.317 0.319 0.312 0.314
3 Sketch B 0.3125 0.319 0.314 0.316
4 Sketch E 0.3125 0.314 0.313 0.317 0.312 0.313
5 Middle E 0.3125 0.306 0.311 0.313 0.310 0.310
6 Middle E 0.3125 0.306 0.311 0.311 0.312 0.313
7 Sketch E 0.3125 0.311 0.312 0.314 0.315 0.314
8 Sketch E 0.3125 0.308 0.307 0.310 0.307 0.307
9 Middle E 0.3125 0.315 0.312 0.313 0.312 0.310
10 Middle E 0.3125 0.314 0.317 0.316 0.322 0.326
11 Sketch E 0.3125 0.319 0.316 0.313 0.305 0.305
12 Sketch E 0.3125 0.315 0.317 0.313 0.313 0.311
13 Middle E 0.3125 0.316 0.313 0.324 0.318 0.318
14 Middle E 0.3125 0.316 0.318 0.317 0.314 0.317
15 Sketch E 0.3125 0.311 0.316 0.316 0.312 0.319
16 Sketch C 0.3125 0.320 0.317 0.319
17 Sketch E 0.3125 0.309 0.306 0.308 0.307 0.307
18 Sketch D 0.3125 0.326 0.327 0.316
Note: The lowest UT measurements are in RED, and the highest UT measurements are in GREEN for each plate location (Sketch, Middle, and Annular)
APPENDIX B: ENGINEERING DRAWINGS
| Scott AFB - Tank 33 |
| Tank 33 Layout1 (1) |
| Tank 33 Layout1 (2) (1) |
| Tank 33 Layout1 (3) (1) |
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