Attachment J.1 - FAC 7205 API 653 OOS Insp FY17.pdf

US Army Corps of Engineers Omaha District

API 653 Out-of-Service Inspection Report

Fort Campbell Facility Number 7205 (Oasis Rapid Fuel)

Tank Number A7205

US Army Corps of Engineers Center of Expertise for Petroleum, Oils and Lubricants

(USACE POL-MCX)

7/18/2017

API 653 Out-of-Service Inspection Report Fort Campbell, KY

Table of Contents

ACRONYMS AND ABBREVIATIONS

GENERAL SUMMARY

INSPECTION DATE

PREVIOUS INSPECTION DATES

RECOMMENDED FUTURE INSPECTION DATES (CALCULATIONS SHALL BE PROVIDED)

GENERAL TANK INFORMATION

A. GENERAL PROJECT INFORMATION

1. API 653 Inspection

2. Site Information

1. Tank Construction

2. Tank Foundation

3. Tank Shell

4. Tank Appurtenances

5. Tank Coating

6. Tank Piping System

7. Fire Protection System

8. Secondary Containment

C. FINDINGS AND RECOMMENDATIONS

1. MANDATORY REPAIRS per API 653, UFC 3-460-01, or AW 78-24-27 Standards

2. REQUIRED REPAIRS to Fully Comply with API 653 or Federal, State, and Local Codes

3. RECOMMENDED REPAIRS to fully comply with UFC 3-460-01 & AW 78-24-27 Standards or as Part of Regular Maintenance

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

A.1 BOTTOM SERVICE LIFE EVALUATION

A.2 SHELL SERVICE LIFE EVALUATION

A.3 SHELL SETTLEMENT EVALUATION

A.4 ULTRASONIC UT DATA

A.5 CONTAINMENT LAYOUT DRAWING

A.6 BOTTOM LAYOUT DRAWING

A.7 SHELL LAYOUT DRAWING

A.8 ROOF LAYOUT DRAWING

A.9 OSHA ACCESS STRUCTURE REPORT

APPENDIX B: 3-D DOCUMENTATION & ANALYSIS

APPENDIX C: API 653 CHECKLISTS FOR TANK INSPECTIONS

APPENDIX D: PHOTOGRAPHS

ACRONYMS AND ABBREVIATIONS

API American Petroleum Institute

ASME American Society of Mechanical Engineers

ASNT American Society of Non-Destructive Testing

ATG 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

GENERAL SUMMARY

Summary of Inspection

An API Standard 653 Out-of-Service inspection of Tank A7205 (Facility 7205) at Fort Campbell in Fort Campbell, KY was completed on July 18, 2017. The shell service life evaluation performed as having greater than 30 years of remaining shell life under current conditions. The bottom life evaluation performed on the tank shows it as having a greater than 30 years of remaining life under current conditions. The significant findings are summarized below.

Significant Findings (overview)

The containment floor and walls have cracks and failed joint sealant; in the current condition, the containment is not in accordance with 40 CFR 112.7.

The sealant between the concrete foundation ringwall and the concrete containment floor has approximately 98.5’ of failure (almost 100%); in the current condition, the tank foundation to containment floor seal is not in accordance with 40 CFR 112.7.

The tank grounding straps (2) are bolted to a lug and have no reinforcement plates installed.

There are no independent low and low-low level alarm assembly systems in accordance with AW 78-24-27

Drawing D.12 Detail 1.

The current configuration of the high-level alarm assembly is not in accordance with AW 78-24-27 Drawing D.12

Details 2 and 3.

The current ATG gauge well system is not an ENRAF system in accordance with AW 78-24-27 Drawing D.07

Detail 4.

The current ATG water probe stilling well is not installed in accordance with AW 78-24-27 Drawing D.07 Details

5 & 7 (VITO System) The gasket seals (thru the floating roof) for the ATG gauge well, water probe, sample gauge well, and fixed roof column support are deteriorated and torn.

The product issue thermal relief valve (TRV) piping has a check valve and ball valve, both of brass construction.

The 1” TRV piping is threaded pipe and fittings.

The product issue double-block and bleed valve (DBB) does not have internal thermal relief piping.

The low suction isolation valve is a wedge type plug valve.

The Product Saver Tank is not equipped with sight glass, piping with quick disconnect fitting, and vent. It has a hand pump only, threaded piping, brass valves, and it is not grounded.

The product receipt/hydrant piping (6” & 8”) have four (4) instances of threaded vents and plugs in the current configuration.

The product receipt/hydrant piping (6” & 8”) have four (4) TRV’s installed with threaded piping and two (2) sight glass indicators. Two (2) of the TRV’s are without isolation valves.

All piping supports utilize a saddle type shoe with an oversized isolation pad which has excessive contact with the pipe where the potential for water to be held between the pad and the piping exposing the pipe surface accelerated corrosion (17 supports).

The water draw valve is a threaded angle valve construction.

The tank does not have an internal ladder installed in accordance with AW 78-24-27 Drawing D.08 Detail 2.

The roof manhole/ladder hatch is flanged with a bolted cover (no internal ladder installed) and is not constructed in accordance with AW 78-24-27 Drawing D.09 Detail 3.

The spiral stairway isn’t connected to ground with a copper grounding bar for personnel grounding in accordance with AW 78-24-27 Drawing D.11 Detail 4.

The top rail height of the stairway is not high enough (requirement: 42-inches / current: 39-inches).

The height of the mid rail is insufficient (requirement: 21-inches / current: 19.25-inches).

The stairway width is inadequate (requirement: 28-inches/ current: 24-inches).

The roof does not have a safety handrail around 100% of the perimeter.

The original name plate does not list the API 650 construction standard edition and has an incorrect height of the tank stamped on the plate.

The tank is not equipped with a 36” manhole. It currently has a 24” manhole and a 24” flush deck clean out.

The tank manhole is not equipped with manhole cover davit arm support in accordance with AW 78-24-27

Drawing D.10 Detail 3.

The tank label/marking is faded, worn, and weathered.

The Varec Mechanical Tank Gauge (MTG) float and tape were hung up at approximately the 6’ level during inspection and is not in satisfactory operational condition.

The external fixed roof coating has rust staining, chalking, and general weathering.

The external shell coating has minor rust staining, chalking, and general weathering.

The internal tank bottom coating has heavy rust staining around the center roof support column reinforcement pad junction.

The secondary containment drain basin is not in accordance with AW 78-24-27 Drawing CD.09; the containment does slope to the drain line, but there is no basin.

The secondary containment drain valve is not in accordance with AW 78-24-27Drawing CD.09; the current drain valve is an 8” carbon steel gate valve.

The center fixed roof vent is a non-flanged 8” flat head vent and is not in accordance with AW 78-24-27 Drawing

D.09 Detail 2.

The fixed roof has 2 circulation vents/inspection hatches; the number (amount) of vents is not in accordance with API Std 650 Sect.H.5.3.3, and the construction of the vents/hatches is not in accordance with AW 78-24-27 Drawing D.09 Detail 1.

There are no scaffolding cable supports installed on the fixed roof in accordance with API Std 650 Fig 5.22 and UFC 3-460-01 Table 8-1 Item (ff).

The internal piping for the fill line (receipt) is not installed in accordance with AW 78-24-27 Drawing D.08 Detail 1.

At the time of inspection, the cathodic protection system was not in operation, with minimal records of monthly testing at the rectifier.

INSPECTION DATE

API Out-of-Service Inspection Date: 18 July 2017

Equipment Used:

Ultrasonic Thickness Meter Manufacturer: General Electric Model Number: DMS 2 Calibration Method: Zeroing Procedure, Copper Coating Calibration

Procedure, and Two Point Calibration Procedure Tank Bottom Scanner Manufacturer: MFE Enterprises Model: 2412 Mark 1 Calibration Method: Sensitivity adjustment on manufacturer test plate

Tank Shell Surveying Manufacturer: Leica Model: 3D DISTO Calibration Method: Tilt sensor calibration automatically performed with unit set at < 3° and crosshairs calibration using target at a distance > 25 m

Tank Bottom Surveying Tool Manufacturer: Hilti Model: Hilti 286210 Rotating Laser PR 25 IF Calibration Method: Main & tranverse horizontal axes checks at 20 m <

6m

Inspector(s): Eric B. Ricks

PREVIOUS INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: 17 June 2008

RECOMMENDED FUTURE INSPECTION DATES (CALCULATIONS SHALL BE PROVIDED)

API In-Service (External) Inspection Date: 18 July 2022 API Out-of-Service (Internal) Inspection Date: 18 July 2027

Eric B. Ricks API 653 Inspector No. 1667

GENERAL TANK INFORMATION

ITEM DESCRIPTION

Owner Fort Campbell Location Oasis Rapid Refuel Point Facility Number 7205 Tank Number A7205 State / Country Kentucky, United States City Fort Campbell Inspection Date 07/18/2017 Tank Manufacturer Horton Tank Design Standard API 650 Date of Construction 1972 Tank Contents Jet A / F-24 Tank Diameter 30.00 Feet Shell Height 32.00 Feet Product Height 30.33 Feet Tank Capacity 169,193.61 Gallons / 4,028.39 BBL Foundation Concrete Ringwall

Construction

Bottom Lap-Welded Shell Butt-Welded Floating Roof Petrex® Aluminum Honeycomb Fixed Roof Lap-Welded

Material

Bottom Carbon Steel 283C (Assumed) Shell Carbon Steel A36 (Assumed) Floating Roof Aluminum Fixed Roof Carbon Steel 283C (Assumed)

Cathodic Protection Impressed Current

Interior Coating System Thin Film Epoxy Coating

Exterior Coating System Thin Film Epoxy Coating

Level Gauging MTS Electronic Gauging / Varec 2500 Mechanical Tape Gauge

Overfill Protection Hydraulically Operated High Level Shut-Off Valve with Dedicated Float (Set at 29.67’)

Piping Receipt 6” Carbon Steel Issue 6” Carbon Steel Low Suction 3” Carbon Steel Water Draw-Off 1.5” Carbon Steel

Level Alarms

Low-Low Level Alarm: XX (Info Requested from POL POC) Low Level Alarm: XX (Info Requested from POL POC) High Level Alarm: XX (Info Requested from POL POC) High-High Level Alarm: XX (Info Requested from POL POC)

High Level Control Shutoff: 29.67’ Type of Internal Floating Roof Petrex® Aluminum Honeycomb Sandwich Panel

A. GENERAL PROJECT INFORMATION

1. API 653 Inspection This project will perform API 653 inspections of various tanks at facilities throughout the United States.

Additional consideration is given to federal, state, and local regulations, as well as applicable military criteria and general industry standards.

An API Standard 653 Out-of-Service (Internal) inspection was performed for Tank A7205.

2. Site Information On July 20, 2017 Burns & McDonnell and our sub-consultant (InterSpec, LLC) performed an API 653 Out of Service (External & Internal) inspection of Tank A7205, located at United States Army Base Fort Campbell in Hopkinsville, Kentucky. Fort Campbell is home to the 101st Airborne Division and the 160th Special Operations Aviation Regiment.

B. TANK INSPECTION COMMENTS

1. Tank Construction Oasis Tank (FAC A-7205) is a nominal 4,028.39 bbl, 30-foot diameter by 32-foot tall, Jet A (Jet Fuel), aboveground vertical storage tank. The manufacturer’s nameplate is available and legible. The nameplate lists the tank as being constructed by Horton Tank/Chicago Bridge & Iron in 1972 to API Standard 650 under contract number 72-4611U.

2. Tank Foundation The tank rests on a concrete ringwall above the containment floor. The tank has cathodic protection, secondary containment, and bottom leak detection. The foundation was visually evaluated during the inspection for broken concrete, spalling, cracks, and vegetation against the bottom of the tank. No spalling and vegetation were present. The tank foundation to chime interface has sealant applied;

approximately 95.25 linear feet of the sealant is cracking and deteriorating. The tank foundation to containment floor interface has sealant applied; approximately 98.5 linear feet of the sealant is cracking and deteriorating. A shell settlement survey was performed during the inspection in accordance with Appendix B of API Standard 653. Settlement results are listed in Appendix A.

3. Tank Shell The shell is constructed of carbon steel material A36 specification. The shell is of cylindrical design, butt-welded together, consisting of four (4) courses. The shell exterior has a thin film epoxy coating system. The coating was inspected for disbonding, adhesion, deterioration, and discoloration. The shell was evaluated for remaining metal thickness utilizing ultrasonic technology. The shell is equipped with one 24” manhole and one 24” flush deck cleanout nozzle. The ultrasonic thickness measurements and thickness measurement locations (TML) are listed in the Shell Plate Thickness Measurements table in Appendix A. A shell service life evaluation performed on all shell courses shows that the shell has a remaining life of greater than 30 years under current conditions. The shell service life evaluation is shown in the Shell Service Life Evaluation table in Appendix A. Roundness, plumbness, peaking, and banding of the shell are all within the allowable tolerances of API Standard 653. The tank is stable and does not appear to be in danger of overturning or buckling due to high winds or seismic conditions.

4. Tank Appurtenances

a. Internal Floating Roof

The tank is equipped with a full surface contact aluminum honeycomb design floating roof that is fitted with primary and secondary wiper perimeter seals. The roof is supported by five (5) floating roof legs. A twelve inch square bearing plate with rounded corners is welded to the tank bottom for each floating roof leg. The primary and secondary seals are in good mechanical condition. Measured the annular space at several locations from the tank bottom, and the floating roof is determined to be properly centered inside the tank.

b. Gauging The tank is not equipped with an ENRAF ATG or a VITO water/temperature probe. The tank’s electronic gauging system is an MTS ATG that is installed through a fully slotted 10-inch carbon steel gauge well. Manual gauging may be performed through the fully slotted 10-inch aluminum stilling well. A VAREC Mechanical tape level gauge (MTG) provides back-up tank gauging; at the time of inspection, the MTG tape was hung, and the float was at approximately 7’ in height.

c. Level Alarms High and high-high level alarms are mounted on the tank exterior near the spiral stairway.

The tank is not equipped with low and low-low level alarms independent of the tank gauging system as required by UFC criteria.

d. Stairs and Platforms The tank’s fixed roof is accessible by a circumferential stairway mounted on the shell of the tank with a top platform. The stairway and platform were inspected for corrosion and structural soundness. The stairway handrail is constructed with 2 ½” angle and steel treds with a non-slip profile. The exterior coating on the spiral stairway has chalking, weathering, and minor surface rust.

e. Grounding and Bonding There are two (2) ground cables bolted to lugs on the tank shell. The grounding cables penetrate through the secondary containment floor presumably to a grounding rod. The internal floating roof is bonded to the tank shell. A copper grounding bar for personnel electric discharge is not mounted on the handrail (typically required by military criteria).

f. Cathodic Protection An impressed current system is installed for this tank; at the time of the inspection, the rectifier was not powered/operational. The latest test records found at the rectifier were conducted by Universal Rectifiers on June 21, 1995.

5. Tank Coating The tank shell, bottom, fixed roof, handrails, piping, and appurtenances are coated. The exterior coating appears to be an epoxy with a polyurethane top coat; the polyurethane top coat has weathered, and the coating is chalking due to UV exposure with rust stains bleeding through. The internal coating is in good condition; the only area of visible possible deterioration is underneath the center roof support column where the reinforcement pad has heavy rusting and staining.

6. Tank Piping System Fuel is received through 8-inch carbon steel piping (6-inches at tank) and is issued from the tank through 8-inch carbon steel pipe (6-inches at tank). The diffuser is rolled to a circular transition with a final outlet diameter of NPS 10. The product is issued from the tank through a 6-inch carbon steel pipe that extends 120-inches into the tank. The other auxiliary piping for the water draw (NPS 2) and low suction (NPS 3) are installed, and both extend to the center tank bottom sump. Inspected and evaluated each tank nozzle in accordance with API Standard 650 and 653. Identified the type and use of each shell nozzle and measured the nozzle neck thickness on all accessible shell nozzles. Evaluated all nozzles and reinforcement plates for leaks and corrosion.

7. Fire Protection System A fire hydrant was noted within 300 feet of this tank; the tank is not equipped with an AFFF system.

8. Secondary Containment The tank sits within a concrete secondary containment basin with concrete dike walls. The overall dimension of the secondary containment is 83 feet x 84.5 feet, with a sloped berm wall height of 50”. The secondary containment is equipped with a 4-inch drain line on the northwest side of the containment that is recessed into the bottom of the containment wall/containment bottom step junction and is connected to a 6-inch gate valve on the opposite side (exterior) of the containment wall, without an actual drain sump/pit. The configuration of the recessed drain line into the concrete made properly sealing the drain line for testing impossible.

40 CFR 112.7(c) states that the entire secondary containment system, “including walls and floor, must be capable of containing oil and must be constructed so that any discharge from a primary containment system ... will not escape containment before cleanup occurs.” 40 CFR 112.8(c)(2) and 40 CFR 112.12(c)(2) state that diked areas must be “sufficiently impervious to contain oil.” The purpose of the secondary containment requirement is to prevent discharges, as described in 40 CFR 112.1(b); therefore, effective secondary containment methods must be able to contain oil until the oil is cleaned up. An informal containment evaluation was conducted. The containment appears to be of sufficient size to contain a total tank loss per UFC 3-460-1, paragraph 8-14.2.1 which states, “The containment area needs to have sufficient capacity to contain the tank contents plus one foot of freeboard. If the containment has the capacity to contain the tank contents plus one foot of freeboard, the containment area is sufficient.”

The containment floor and walls were inspected for cracks, spalling, washout, and vegetation against the bottom of the tank. Approximately 172.8 linear feet of sealed cracks in the containment berm were identified. This includes 56.3 linear feet in the containment floor and 116.5 linear feet on top of the containment walking path. The epoxy sealant for the secondary containment floor/interior walls expansion and slab joints have almost 100% deterioration/failure. An approximate total of 1,817 linear feet of joint sealant failure was measured. The containment is otherwise in mostly satisfactory condition, with the exception of the discrepancies identified above. The containment floor is sloped to allow for drainage away from the tank as required by NFPA-30. The containment was visually evaluated during the inspection. The containment appears to be of sufficient size to contain a total tank loss.

C. FINDINGS AND RECOMMENDATIONS

The following information identifies the significant findings found during the tank inspection.

The tank is generally not in accordance with current military criteria for some of the tank appurtenance and piping configuration. Therefore, the recommendations are not meant to bring the tank into full compliance with UFC 3-460-01 or AW 78-24-27 standards but rather to identify these items for the owner/user’s planned upgrades, rehabilitation, and priority repairs. Mandatory repairs should be completed to assure compliance with industry standards, as well as federal or state jurisdictional requirements.

During this evaluation, the tank bottom was found to be in a generally serviceable condition, with no imminent risk to operation and overall integrity. However, there were several deficiencies that were noted. These noted deficiencies are listed below in no particular order, with repair recommendations.

All repairs and modifications should be performed in accordance with API standard 653, UFC 3-460-01, DoD Standard Design 78-24-27, and applicable UFGS specifications.

1. MANDATORY REPAIRS per API 653, UFC 3-460-01, or AW 78-24-27 Standards Mandatory repairs represent items that require immediate attention, in order to prevent imminent risk to system operators, equipment integrity, or the adjacent environment. The tank should remain out of service until these repairs are completed.

a. No mandatory repairs were identified for the Oasis Tank (A-2705)

2. REQUIRED REPAIRS to Fully Comply with API 653 or Federal, State, and Local Codes Required repairs represent items that should be addressed in a timely manner, in order to prevent future potential risks to system operators, equipment integrity, or the adjacent environment. These items are required by API-653 or federal, state, and local codes.

a. Secondary Containment OBSERVATION: The containment floor and walls have cracks and failed joint sealant. The foundation to containment floor junction has failed joint sealant. The foundation to tank bottom extension has failed joint sealant.

CODE REFERENCE: 40 CFR 112.7

RECOMMENDATION: Seal the cracks in the floors and walls and apply new joint sealant where it has failed.

b. Top Rail OBSERVATION: The top rail height of the ladder is not high enough (requirement: 42-inches / current:

39-inches).

CODE REFERENCE: OSHA

RECOMMENDATION: Extend the top rail height to 42 inches.

c. Mid Rail OBSERVATION: The height of the mid rail is insufficient (requirement: 21-inches / current: 19.25-inches).

RECOMMENDATION: Extend the mid rail height to 21 inches or replace current safety rail system.

d. Stairway Width OBSERVATION: The stairway width is inadequate (requirement: 28-inches/ current: 24-inches).

RECOMMENDATION: Extend the stairway width to 28-inches or replace the stairway system.

e. Spiral Stairway Initial Step OBSERVATION: The first step for the spiral stairway measured 12.75 inches off the ground. The average stair tred rise is 7 inches. This poses a safety hazard for personnel using the stairway.

CODE REFERENCE: 1910.25(c)(2) RECOMMENDATION: Install a concrete approach step at the base of the stairway to meet the stairway riser height requirments of OSHA.

f. Abandoned Mounting Plates for Internal Piping Support OBSERVATION: There are 4 rectangular 12” x 6” abandoned mounting plates for the internal piping support with squared corners.

REFERENCE: According to API Standard 653, Paragraph 9.10.3.1 “If other welded-on plates such as wear, isolation, striker and bearing plates, are to be added to tank bottoms, they shall be installed in accordance with 9.10.1 and examined in accordance with 12.1.7. For these additional welded on plates, if the lap weld spacing requirements as set forth in Figure 9-5 are not met, magnetic particle (MT) or liquid penetrant (PT) examination is required for the exposed welds or portions of welds failing to meet minimum spacing criteria. See API 653 Section 12 for acceptance requirements.” NOTE: MT or PT NDT methods require the coating removal and surface prepared as required in ASME Section V Article 6 or Article 7. These examinations may have been accomplished during the 2009 tank repair, but review of the provided documents did not indicate the testing methods performed. A close visual inspection of the welded-on plate and adjacent bottom weld did not reveal any stressed areas (indication of cracked weld, cracked coating, or capillary action effects of residues).

RECOMMENDATION: Future repair project should consider removal of these abandoned mounting plates or perform examination in accordance with 12.1.7 (requires coating removal to do MT or PT examination).

g. Tank Grounding Lug OBSERVATION: The tank grounding straps are bolted to the tank shell (mechanical joint on a coated interface) and have no reinforcement plates or grounding lug IAW AW 78-24-27 Drawing ED.02 Detail 2.

REFERENCE: AW 78-24-27 Drawing ED.02 Detail 2. (See also API 650 Section 5.8.11.3) RECOMMENDATION: Exothermically weld the grounding cables to the lug and install reinforcement at the shell in accordance with AW 78-24-27 Drawing ED.02 Detail 2. Note: if repairs are elected not to be done, the paint should be removed where the cable bolts to the lug, to provide a better connection to ground (Quantity: 2 ground connections).

h. Product Saver Tank OBSERVATION: The Product Saver Tank lacks sight glass, piping with quick disconnects (one currently installed but difficult to access), and vent. It only has a hand pump, threaded piping ,and brass valves (Quantity: 3) REFERENCE: AW 78-24-27 Drawing D.13 Detail 5 and NFPA 30, paragraph 6.5.4 RECOMMENDATION: Replace the Product Saver Tank in accordance with AW 78-24-27 Drawing D.13 Detail 5.

i. Stairway Path Restricted OBSERVATION: There is limited or restricted path on the spiral stairway due to HLA and HLV projection in towards the stairway. There is no intermediate platform. There is an approximately sixteen (16)-inch clearance between the handrail and HLA float chamber. This reduces the existing thread width.

REFERENCE: UFC 3-460-01 Section Table 8-1 item j. OSHA minimum required thread width is 22 inches (1920.25(C)(3)) RECOMMENDATION: Install an intermediate platform or rework the stairway to provide sufficient path past the HLA and HLV system.

j. IFR Pipe Penetration Gaskets

OBSERVATION: The internal floating roof stilling wells penetration gaskets have deteriorated (four gaskets).

REFERENCE: General maintenance/ manufacturer instruction and API 653 checklist item (opening in seals that will permit vapor emissions).

RECOMMENDATION: Replace the gaskets. Gaskets inside the tank nozzles shall be non-asbestos, fuel resistant composition, or preformed type.

k. Shell Manhole Cover with No Hinge or Davit Arm OBSERVATION: The shell manhole cover is not equipped with a hinge or davit arm to facilitate the handling of the manhole cover plate.

REFERENCE: API STD 650 Section 5.8.3.5 states “Shell manhole covers shall have two handles. Those covers weighing more than 34 kg (75 lb) shall be equipped with either a hinge or davit to facilitate the handling of the manhole cover plate. The davit support arm shall not be welded directly to the shell without a reinforcing plate”. Also AW 78-24-27 drawing D.10 detail 3.

RECOMMENDATION: Install shell manhole davit arm IAW with API STD 650 and AW 78-24-27 drawing D.10 detail 3.

l. Tank Name Plate Data OBSERVATION: The construction nameplate data shows an incorrect tank height.

REFERENCE: API STD 650 Section 10.1 RECOMMENDATION: Install a corrected tank nameplate IAW API 650 10.1

3. RECOMMENDED REPAIRS to fully comply with UFC 3-460-01 & AW 78-24-27 Standards or as Part of Regular Maintenance Recommended repairs represent items that should be addressed in a timely manner, in order to prevent future potential risks to system operators, equipment integrity, or the adjacent environment.

a. External Piping Supports OBSERVATION: The pipe supports utilize a saddle type shoe with an oversized isolation pad which has excessive contact with piping. Water could be held between the pad and piping exposing the pipe surface to accelerated corrosion. (17 supports) CODE REFERENCE: AW 78-24-27 Drawing CD.13 and UFC 3-460-01 Section 9-3.2.

RECOMMENDATION: Provide inverted tee style pipe supports per AW 78-24-27 Drawing CD.13

b. Low-Level Alarm Assembly OBSERVATION: The tank is not equipped with an independent low-level alarm CODE REFERENCE: AW 78-24-27 Drawing D.12 Detail 1.

RECOMMENDATION: Install a low and low-low level alarm assembly IAW AW 78-24-27 Drawing D.12 Detail 1

*NO PHOTOS OF THIS FINDING

c. High and High-High Level Alarm OBSERVATION: The current configuration utilizes thread unions and fittings; cannot manually test each alarm in this configuration.

CODE REFERENCE: AW 78-24-27 Drawing D.12 Detail 2 RECOMMENDATION: Install a High and High-High level alarm system IAW AW 78-24-27 Drawing D.12 Detail 2

d. Tank Manholes OBSERVATION: The tank currently has one 24-inch manhole, one 24-inch flush deck, and no manhole on the second shell course for floating roof access.

CODE REFERENCE: UFC 3-460-01 Table 8-1 Item (f) RECOMMENDATION: Replace existing shell manholes and install new floating roof access manhole on second shell course IAW AW 78-24-27 Drawing D.10 Detail 3

e. Tank Labels and Markings OBSERVATION: The current tank MIL Standard labels/markings are weathered and faded (Quantity:

2).

CODE REFERENCE: UFC 3-460-01 Section 2-18 b RECOMMENDATION: Install new labels.

f. Tank External Coating OBSERVATION: The exterior coating on the tank shell, roof, and appurtenances is faded, weathered, and has chalking with rust bleeding through.

CODE REFERENCE: API 652

RECOMMENDATION: Grit blast and recoat the tank shell, roof, and appurtenances IAW API Standard 652 and NACE recommended practices.

g. Internal Tank Coating OBSERVATION: The interior tank bottom coating has heavy surface rust underneath the center roof support column at the base plate junction.

CODE REFERENCE: API 652

RECOMMENDATION: Lift the fixed roof support column from the base plate; grit blast and recoat IAW API Standard 652 and NACE recommended practices.

h. Cathodic Protection OBSERVATION: The current cathodic protection impressed current rectifier is not powered/operational and testing records are not up to date.

CODE REFERENCE: API 651

RECOMMENDATION: Repair/replace the current rectifier/cathodic protection system.

i. Containment OBSERVATION: The current secondary containment drain system does not have a basin or port eccentric plug valve.

CODE REFERENCE: AW 78-24-27 Drawing CD.09 RECOMMENDATION: Install a containment drain basin and valve IAW AW 78-24-27Drawing CD.09.

j. Center Roof Vent OBSERVATION: The current center roof vent is an 8-inch non-flanged with a flat head.

CODE REFERENCE: AW 78-24-27 Drawing D.09 Detail 2 RECOMMENDATION: Replace current vent IAW AW 78-24-27 Drawing D.09 Detail 2.

k. Fixed Roof Circulation Vent/Inspection Hatches OBSERVATION: There are currently 2 circulation vents/inspection hatches on the fixed roof; the vents are installed to current military standards.

CODE REFERENCE: AW 78-24-27 Drawing D.09 Detail 1,UFC 3-460-01 Table 8-1 Item (h), and API 650 Section H.5.2.2.

RECOMMENDATION: Replace the current vent hoods and install 2 additional vents IAW AW 78-24-27 Drawing D.09 Detail 1 and UFC 3-460-01 Table 8-1 Item (h).

l. Fixed Scaffolding Cable Supports OBSERVATION: There are currently no scaffolding cable supports on the fixed roof.

CODE REFERENCE: API 650 and UFC 3-460-01 Table 8-1 Item (ff) RECOMMENDATION: Install two scaffolding cable support on the fixed roof IAW API 650 Figure 5.22 and UFC 3-460-01 Table 8-1 Item (ff).

*NO PHOTO OF THIS FINDING

m. Fixed Roof Manhole/Ladder Hatch OBSERVATION: The current roof manhole/ladder hatch is a flanged and bolted hatch; there is no internal ladder at this access hatch.

CODE REFERENCE: AW 78-24-27 Drawing D.09 Detail 3 RECOMMENDATION: Modify the existing manhole/ladder hatch or install new; install internal access ladder. IAW AW 78-24-27 Drawing D.09 Detail 3.

n. Fixed Roof Perimeter Guardrail OBSERVATION: The fixed roof has 2 partial perimeter guardrails.

CODE REFERENCE: AW 78-24-27 Drawing D.11 Detail 5, API Std 650 Table 5.17 and OSHA 29 CFR 1910.29 RECOMMENDATION: Install a perimeter guardrail around the circumference of the fixed roof IAW AW 78-24-27 Drawing D.11 Detail 5, API Std 650 Table 5.17 and OSHA 29 CFR 1910.29.

o. Auto Tank Gauge ENRAF System OBSERVATION: The auto tank gauging (ATG) system is manufactured by MTS, the fixed roof nozzle assembly is not to MIL standards, and the stilling well is 8-inch carbon steel.

CODE REFERENCE: AW 78-24-27 Drawing D.07 Detail 4 and UFC 3-460-01 Table 8-1 Items (p) and (r) RECOMMENDATION: Remove current ATG system and install IAW AW 78-24-27 Drawing D.07 Detail 4 and UFC 3-460-01 Table 8-1 Items (p) and (r).

p. ATG Water Probe VITO System OBSERVATION: The auto tank gauge water probe(ATG) system fixed roof nozzle assembly is not to MIL standards, the stilling well is 2-inch aluminum, and the internal well terminates approximately 33 inches above the rim of the sump.

CODE REFERENCE: AW 78-24-27 Drawing D.07 Detail 3 and AW 78-24-27 Drawing D.07 Detail 5 RECOMMENDATION: Install an ATG Water Probe VITO System IAW AW 78-24-27 Drawing D.07 Detail 3 and AW 78-24-27 Drawing D.07 Detail 5.

q. Varec Mechanical Tank Gauge OBSERVATION: At the time of inspection, the Varec Mechanical Tank Gauge (MTG) float head was stuck at approximately 7’ height, and the tape was hung. Base personnel were able to free the float head while the tank was empty. During tank refueling, after inspection, the float head became stuck/nonmoving again.

CODE REFERENCE: Good engineering practices/maintenance RECOMMENDATION: Remove the float head and tape assembly; check for kinks, twist and/or tears in tape. Repair or replace the tape Varec MTG IAW AW 78-24-27 Drawing D.07 Detail 1

r. Product Issue DBB Valve OBSERVATION: The product issue DBB valve does not have internal thermal relief piping.

CODE REFERENCE: AW 78-24-27 Drawing D.10 Detail 4 RECOMMENDATION: Provide manufacturers safety bleed internal relief for the valve when closed IAW AW 78-24-27 Drawing D.10 Detail 4.

s. Product Issue Thermal Relief Valve (TRV) Piping OBSERVATION: The product issue TRV piping has a check valve an ad ball valve, both of brass construction; the 1” TRV piping is threaded pipe and fittings CODE REFERENCE: AW 78-24-27 Drawing D.10 Detail 4 RECOMMENDATION: Install TRV piping and components IAW AW 78-24-27 Drawing D.10 Detail 4.

t. Product Receipt/Hydrant Piping OBSERVATION: The product receipt/hydrant (6” and 8”) piping has four instances of threaded vents and plugs in use.

CODE REFERENCE: AW 78-24-27 Drawing D.10 Detail 4, API 570 and Good engineering practices RECOMMENDATION: Replace the threaded components with socket welded fittings and flanged valves.

u. Product Receipt/Hydrant Piping OBSERVATION: The product receipt/hydrant (6” and 8”) have four TRV’s installed with threaded piping and two sight glass indicators. Two of the TRV’s are without isolation.

CODE REFERENCE: AW 78-24-27 Drawing D.10 Detail 4.

RECOMMENDATION: Provide welded/flanged TRV piping IAW AW 78-24-27 Drawing D.10 Detail 4.

v. Containment Piping OBSERVATION: All pipe coatings appear to have a maintenance coat applied but without proper surface preparation. While coated at this time, the coating will not last.

CODE REFERENCE: API 652, NACE recommended practices and API 570 RECOMMENDATION: Planning for new pipe coatings in the future should be considered.

w. Water Draw Valve OBSERVATION: The water draw valve is a threaded angle valve.

CODE REFERENCE: UFC 3-460-01 Section 3-6-7.3 (a) RECOMMENDATION: Install a DBB valve for tank isolation IAW UFC 3-460-01 Section 3-6-7.3 (a).

x. Low Suction Valve OBSERVATION: The low suction valve is a wedge type plug valve.

CODE REFERENCE: UFC 3-460-01 Section 3-6-7.3 (a) RECOMMENDATION: Install a DBB valve for tank isolation IAW UFC 3-460-01 Section 3-6-7.3 (a).

y. High Level Shut off Assembly OBSERVATION: The current configuration of the high-level alarm assembly is assembled with threaded fitting and unions and is not in accordance with AW 78-24-27 Drawing D.12 Details 2 and 3.

There is limited access space on the spiral stairway due to the HLA and HLV projecting in towards the stairway and there is no intermediate platform. There is approximately 14-inches clearance between the handrail and the float chamber CODE REFERENCE: AW 78-24-27 Drawing D.12 Details 2 and 3, OSHA 1910 (C) (3).

RECOMMENDATION: Properly install and configure the high-level alarm system in accordance with AW 78-24-27. Install an intermediate platform or rework the stairway to proide space to pass the HLA and HLV system.

z. Spiral Stairway Grounding OBSERVATION: The spiral stairway isn’t connected to ground with a copper grounding bar for personnel grounding CODE REFERENCE: AW 78-24-27 Drawing D.11 Detail 4.

RECOMMENDATION: Install a copper ground bar at the base of the spiral stairway IAW AW78-24-27 Drawing D.11 Detail 4.

aa. Internal Product Issue Piping OBSERVATION: The current configuration of the internal product issue piping is not installed with miter joints to allow the pipe to follow the slope of the tank bottom. There are no internal flanges. The anti-vortex plate is not round and is larger than 2x the diameter of the piping.

CODE REFERENCE: AW 78-24-27 Drawing D.08 Detail 4 RECOMMENDATION: Consider installing new product issue piping IAW AW 78-24-27 Drawing D.08 Detail 4.

bb. Internal Product Receipt Diffuser Piping OBSERVATION: The current configuration of the internal product issue piping is not installed with miter joints to allow the pipe to follow the slope of the tank bottom. There are no internal flanges, there is only 1 pipe support, the pipe does not transition from round to oval (round at opening now) and the bottom of the pipe is approximately 12.5 inches above the tank bottom.

CODE REFERENCE: AW 78-24-27 Drawing D.08 Detail 1 RECOMMENDATION: Consider installing new product receipt diffuser piping IAW AW 78-24-27 Drawing D.08 Detail 1.

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

A.1 BOTTOM SERVICE LIFE EVALUATION

A.2 SHELL SERVICE LIFE EVALUATION

A.3 SHELL SETTLEMENT EVALUATION

A.4 ULTRASONIC UT DATA

A.5 CONTAINMENT LAYOUT DRAWING

A.6 BOTTOM LAYOUT DRAWING

A.7 SHELL LAYOUT DRAWING

A.8 ROOF LAYOUT DRAWING

A.9 OSHA ACCESS STRUCTURE REPORT

Where:

MRT = minimum remaining thickness at the end of the in-service period of operation, in inches.

O r = in-service interval of operation (years to next internal inspection), in years; not to exceed that allowed by 6.4.2.

t o = original plate thickness, in inches.

RT bc = minimum remaining thickness from bottom side corrosion after repairs, in inches.

Rt ip = minimum remaining thickness from internal corrosion after repairs, in inches.

StP r = maximum rate of corrosion not repaired on the top side, in inches per year. StP r =

0 for coated areas of the bottom. The expected service life of the coating must equal or exceed O r to use StP r = 0.

UP r = maximum rate of corrosion on the bottom, in inches per year. To calculate the corrosion rate, use the minimum remaining thicknesses after repairs. Assume a linear rate based on the age of the tanks. UP r = 0 for areas that have effective cathodic protection.

MRT

(inches)

0.1

0.05

0.05

Note: For areas of a bottom that have been scanned by the magnetic flux leakage (or exclusion) process, and do not have effective cathodic protection, the thickness used for calculating UPr must be the lesser of the MFL threshold or the minimum thickness of corrosion areas that are not repaired. The MFL threshold is defined as the minimum remaining thickness to be detected in the areas inspected. The MFL unit used for scanning the bottom does not have a threshold set point. This unit visually displays all anomalies. The confidence level of this unit diminishes greatly for underside pitting/corrosion that is less than 0.04 inches in depth, based on company experience.

Areas of bottom side corrosion that are repaired should be evaluated with the corrosion rate for the repaired area unless the cause of corrosion has been removed. The evaluation is done by using the corrosion rate of the repaired area for UP r , and adding the patch plate (if used) thickness to the term "minimum of RT bc or RT ip ".

NOTE: The engineering data used to calculate the in-service interval of operation (O r ) assumes the tank remains in the same service and all corrosion rates remain constant.

Bottom Service Life Evaluation

Tank Bottom/Foundation Design

Tank bottom/foundation design with no means for detection and containment of bottom leak

Tank bottom/foundation design with means to provide detection and containment of bottom leak

Applied tank bottom reinforced lining, > 0.05 in. thick, in accordance with API RP 652

MRT =

Or = to RTip RTbc

Present Condition:

1) In-Service Interval of Operation (years to next internal inspection)

Yes Yes Yes Yes

MRT = 0.1 inches

RT ip = 0.25 inches

RT bc 0.23 inches

StP r = 0 inches/year

UP r = 0.000444 inches/year

Therefore, the in-service interval of operation (years to next internal inspection) is:

Bottom Service Life Evaluation

Containment of Bottom:

Bottom Leak Detection:

Cathodic Protection:

Bottom Coated:

O r = 292.7 years

*The MFL unit used for scanning the bottom does not have a threshold set point. This unit visually displays all anomalies. The confidence level of this unit diminishes greatly for underside pitting/corrosion that is less than 0.020 inches in depth, based on company experience. No significant underside corrosion was detected.

Therefore, RT bc is established at 0.355 inches (original thickness of 0.375 inches minus 0.020 inches).

0.23 - 0.1 0 + 0.000444

**Since StP r = 0 and UP r = 0; use StP r + UP r = 0.0002 inches/year for calculation purposes.

= O r

Present Condition:

Bottom Service Life Evaluation

2) Projected Thickness Chart and Graph

Year Thickness MRT

1972 0.250 0.1 2017 0.230 0.1 2022 0.228 0.1 2027 0.226 0.1 2037 0.221 0.1 2047 0.217 0.1

*based on same service and corrosion rates.

Nominal:

Current Lowest Remaining Thickness:

Anticipated Thickness (5 yrs)*:

Anticipated Thickness (10 yrs)*:

Anticipated Thickness (20 yrs)*:

Anticipated Thickness (30 yrs)*:

0.000

0.050

0.100

0.150

0.200

0.250

0.300

1972 1979 1986 1993 2000 2007 2014 2021 2028 2035

In ch es

Year

Projected Thickness Graph

Thickness MRT t min = minimum acceptable shell thickness for each course, in inches; however, t min shall not be less than 0.1 inch for any tank course.

t nom = nominal shell thickness, in inches.

t act = current measured shell thickness, excluding pits and corrosion, in inches.

t prev = previous measured shell thickness, excluding pits and corrosion or t nom , in inches.

D = nominal diameter of the tank, in feet.

H = height from the bottom of the shell course under considerations to the established maximum liquid level, in feet.

H c = calculated safe fill height, in feet, for the current product.

G = specific gravity of the contents.

Y = specified minimum yield strength of the plate; use 30,000 pounds per square inch if not known

(N/A for riveted tanks).

T = smaller of the specified minimum tensile strength of the plate or 80,000 pounds per square inch;

use 55,000 psi if not known (N/A for riveted tanks).

S = The maximum allowable stress, in pounds per square inch. For welded tanks, use the smaller of

0.80Y or 0.429T for the bottom and the second course or the smaller of 0.88Y or 0.472T for all other courses. For riveted tanks, use S =21,000 psi. For elevated temperatures above 200OF, the maximum allowable stress shall be the smaller of 2/3 the minimum yield strength multiplied by the M-factor (M) of API Standard 650 Appendix M or the product design stress value listed in Table M-1a or M-1b of API Standard 650.

E = original joint efficiency for the tank. Use Table 4-2 from API Standard 653 if original E is unknown; E =1.0 when evaluating the retirement thickness in a corroded plate, when away from welds or joints by at least the greater of one inch or twice the plate thickness. For riveted tanks, use E =1.0 for shell plates when greater than 6 inches from rivets; use the value of E from API Standard 653 Table 4-3 when within 6 inches of rivets.

L r = remaining life of the shell, in years.

C r = shell corrosion rate, in inches per year.

I ut = inspection interval for the next ultrasonic inspection, in years (not to exceed 15 years).

I v = inspection interval for the next visual external inspection, in years (not to exceed 5 years).

DY = years between the previous measured shell thickness (t prev ) and the current measured shell thickness (t act ), in years.

The maximum inspection intervals are determined by the most restrictive shell course in regard to the remaining life and the corrosion rate calculations for each shell course using the following formulas:

Shell Service Life Evaluation tmin = 2.6(H−1)DG

SE

Lr = tact − tmin Cr

Cr = tprev − tact Y Iut = tact − tmin

2Cr Iv = tact − tmin

4CrΔ

1) Minimum Required Thickness

D = 30 feet G = 0.87

DY = 45 years

Course No.

Plate Specification

Course Height (feet)

Product Height (feet) (H )

Maximum Allowable

Stress (psi) (S )

Joint Efficiency

(E )

Minimum Acceptable Thickness (inches) (t min )

Previous Measured Thickness (inches) (t prev )*

Current Measured Thickness (inches)

(t act ) 1 A36 8 32 24,900 0.85 0.1 0.1875 0.177 2 A36 8 24 24,900 0.85 0.1 0.1875 0.198 3 A36 8 16 27,400 0.85 0.1 0.1875 0.186 4 A36 8 8 27,400 0.85 0.1 0.1875 0.182

*The t prev values were based on t nom .

Shell Service Life Evaluation

0.000

0.050

0.100

0.150

0.200

0.250

1 2 3 4

In ch es

Course

Thickness Graph tprev tact tmin

Shell Service Life Evaluation

2) Corrosion Rate, Remaining Life and Inspection Intervals

Course No.

Corrosion Rate

(in./yr) (C r )

Remaining Life

(years) (L r )

Next Visual

Inspection (years)

(I v )

Next Ultrasonic Thickness Inspection

(years) (I ut )

1 0.00023 330 5 15 2 0.0002* 490 5 15 3 0.00003 2580 5 15 4 0.00012 670 5 15

Note: The engineering data used to calculate in-service period of operation (Remaining Life) assumes the tank remains in the same service and all corrosion rates remain constant. The maximum safe fill height for the tank is not limited other than by the established maximum operating liquid level and any other appurtenance such as overflow, vents, or firefighting system.

0.00000

0.00005

0.00010

0.00015

0.00020

0.00025

1 2 3 4 5 6

In ch es P er Y ea r

Course

Course Corrosion Rate Graph

Corrosion Rate

3) Projected Thickness Chart and Graph

Course #1:

Year Thickness tmin 2017 0.177 0.1 2022 0.176 0.1 2027 0.175 0.1 2037 0.172 0.1 2047 0.170 0.1

*based on same service and corrosion rates.

Course #2:

Year Thickness tmin 2017 0.198 0.1 2022 0.197 0.1 2027 0.196 0.1 2037 0.194 0.1 2047 0.192 0.1

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)* Anticpated Thickness (20 yrs)* Anticpated Thickness (30 yrs)*

Current Thickness:

Current Thickness:

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)* Anticpated Thickness (20 yrs)* Anticpated Thickness (30 yrs)*

0.000

0.050

0.100

0.150

0.200

2017 2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047

In ch es

Year

Course #1 Projected Thickness Graph

Thickness tmin

0.000

0.050

0.100

0.150

0.200

0.250

2017 2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047

In ch es

Year

Course #2 Projected Thickness Graph

Thickness tmin

Course #3:

Year Thickness tmin 2017 0.186 0.1 2022 0.186 0.1 2027 0.186 0.1 2037 0.185 0.1 2047 0.185 0.1

Course #4:

Year Thickness tmin 2017 0.182 0.1 2022 0.181 0.1 2027 0.181 0.1 2037 0.180 0.1 2047 0.178 0.1

Anticpated Thickness (20 yrs)* Anticpated Thickness (30 yrs)*

Anticpated Thickness (20 yrs)* Anticpated Thickness (30 yrs)*

Current Thickness:

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)*

Current Thickness:

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)*

0.000

0.050

0.100

0.150

0.200

2017 2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047

In ch es

Year

Course #3 Projected Thickness Graph

Thickness tmin

0.000

0.050

0.100

0.150

0.200

2017 2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047

In ch es

Year

Course #4 Projected Thickness Graph

Thickness tmin

S max = maximum permissible out-of-plane deflection, in feet.

L = ΠD /N = arc length between measurement points, in feet.

D = tank diameter, in feet N = number of survey points.

Y = yield strength, in pounds per square inch (psi).

E = young's modulus, in pounds per square inch (psi) H = tank height, in feet

D = 30 feet N = 8 L = 3.14(30)/8 = 11.78 feet Y = 30,000 psi E = 29,000,000 psi H = 32 feet L 2 = 138.7913 square feet

11(138.7913)(30,000) 2(29,000,000)(32)

1) Maximum Permissible Out-of-Plane Deflection Calculation

S max = = 0.0247 feet

Shell Settlement Evaluation

𝑆𝑆𝑚𝑚𝑚𝑚𝑚𝑚 =

11𝐿𝐿2𝑌𝑌

2𝐸𝐸𝐸𝐸

|S i | = U i - (1/2U i-1 + 1/2U i+1 )

|S i | = magnitude of the calculated out-of-plane deflection, in feet.

U i = Out-of-Plane settlement of point "i ", in feet

(+) when above cosine curve (-) when below cosine curve

Point Actual Curve Fit U i U i+1 U i-1 S i |S i | 1 4.333333 4.345537 -0.012204 0.020833 0.000000 0.000000 0.022621 2 4.375000 4.375000 0.000000 -0.012204 -0.071129 -0.071129 0.041667 3 4.333333 4.404463 -0.071129 0.000000 -0.041667 -0.041667 0.050296 4 4.375000 4.416667 -0.041667 -0.071129 -0.029463 -0.029463 0.008629 5 4.375000 4.404463 -0.029463 -0.041667 0.000000 0.000000 0.008629 6 4.375000 4.375000 0.000000 -0.029463 0.071129 0.071129 0.020833 7 4.416667 4.345537 0.071129 0.000000 0.020833 0.020833 0.060713 8 4.354167 4.333333 0.020833 0.071129 -0.012204 -0.012204 0.008629

1) Out-of-Plane Deflection Calculation

Shell Settlement Evaluation

Shell Settlement Graph

Shell Settlement Evaluation

4.32

4.34

4.36

4.38

4.4

4.42

2 3 4 5 6 7 8 1

F ee t

Data PointsShell Settlement

Optimum Cosine Curve

Min. Settlement at (Pt 1)

Max. Settlement at (Pt 7)

1 2 3 4 5

1 0.248 0.225 0.251 NA NA A

2 0.256 0.249 0.246 0.253 0.250 A 3 0.251 0.254 0.248 0.260 0.247 C

4 0.259 0.252 0.251 NA NA C

5 0.253 0.249 0.257 0.248 0.257 E 6 0.256 0.261 0.259 0.248 0.254 E 7 0.249 0.255 0.253 0.250 0.251 E

8 0.259 0.260 0.256 NA NA B

9 0.251 0.247 0.253 0.258 0.255 B

10 0.248 0.254 0.250 0.251 0.247 D

11 0.252 0.252 0.249 NA NA D

Bottom Plate Thickness Measurements

NOTE: The lowest UT measurements are in…