Attachment J.2 -Tank 967 Inspection Report.pdf

Gilbane Tanks K1002 and W0003 – Post Repair API 653 Inspections

June 19, 2019

All Pond marketing materials are printed on papers containing post-consumer recycled fibers and are FSC Certified.

June 4, 2020

Ronald J. Weiser

Project Manager ronald.j.wieser@usace.army.mil

USACE, Omaha District

Contract Number: W9128F-17-D-0016

Task Order Number: W9128F20F0026

Submittal Number: 022

Per SOW para 2.4.1 & 2.4.1.2, see attached for the following documents:

1. Savannah ANG – Tank 967 – In-Service API 653 Inspection Report (Final)

2. Savannah ANG – Tank 967 Attachment C

Respectfully submitted, Pond

Anthony E, Chinn, EIT

Program Manager | Mechanical Integrity chinna@pondco.com

678-591-5242

CC: Perrie Kreger – perrie.r.kreger.mil@mail.mil

US Army Corps of Engineers Omaha District

API 653 In-Service Inspection Report

Savannah Air National Guard Facility 967

Tank 967

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

(USACE POL-MCX)

3/24/2020

API 653 Inspection Report Savannah ANG, Georgia

Table of Contents

ACRONYMS AND ABBREVIATIONS

GENERAL SUMMARY

INSPECTION DATE

STATE REGULATIONS

PREVIOUS INSPECTION DATES

RECOMMENDED FUTURE INSPECTION DATES

GENERAL TANK INFORMATION

A. GENERAL PROJECT INFORMATION

1. API 653 IN-SERVICE (EXTERNAL) INSPECTION

2. SITE INFORMATION

B. TANK INSPECTION COMMENTS

1. TANK CONSTRUCTION

2. TANK FOUNDATION

3. CATHODIC PROTECTION

4. TANK SHELL

5. FIXED ROOF

6. TANK APPURTENANCES

7. TANK AND PIPING COATING

8. TANK PIPING SYSTEM

9. FIRE PROTECTION SYSTEM

10. SECONDARY CONTAINMENT

C. FINDINGS AND RECOMMENDATIONS

1. MANDATORY REPAIRS PER API 653, UFC 3-460-01, OR DoD AW 78-24-27 STANDARDS

2. SHORT-TERM RECOMMENDED REPAIRS

3. LONG-TERM RECOMMENDED REPAIRS

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

NEXT INSPECTION

API/OSHA ACCESS STRUCTURE REPORT

APPENDIX B: API 653 CHECKLISTS FOR TANK INSPECTIONS

APPENDIX C: PHOTOGRAPHS

ACRONYMS AND ABBREVIATIONS

AFFF Aqueous Film Forming Foam

ANG Air National Guard

API American Petroleum Institute

ATG Automatic Tank Gauge

AW Airlift Wing

BBL Barrel

CP Cathodic Protection

DFT Dry Film Thickness

DoD Department of Defense

HHLA High-High Level Alarm

HLA High Level Alarm

HLCV High Level Control Valve

IAW In Accordance With

ICCP Impressed Current Cathodic Protection

IFR Internal Floating Roof

LLA Low Level Alarm

LLLA Low-Low Level Alarm

NDT Non-Destructive Testing

NFPA National Fire Protection Association

OSHA Occupational Health and Safety Administration

PRT Product Recovery Tank

TLG Tape Level Gauge

TRV Thermal Relief Valve

UFC Unified Facilities Criteria

USACE United States Army Corps of Engineers

UTT Ultrasonic Thickness Testing

VT Visual Testing

GENERAL SUMMARY

Pond was retained by the United States Army Corps of Engineers (USACE) to provide an in-service tank inspection for Tank 967 at Savannah Air National Guard (ANG) in Savannah, Georgia.

The in-service inspection was performed 23-24 March 2020. Results of this inspection identified recommended repairs/upgrades to fully comply with applicable sections of American Petroleum Institute (API) 650/653, Unified

Facilities Criteria (UFC) 3-460-01/3-460-03, Department of Defense (DoD) standard AW 78-24-27, National Fire

Protection Association (NFPA) 407, Occupational Health and Safety Administration (OSHA) guidelines, and industry standards.

Tank 967 is a welded, steel, vertical, aboveground Jet A (F-24) storage tank. The tank was constructed by an unknown manufacturer in 1969. The tank is 31’-0” in diameter and 38’-9” high with a nominal capacity of 5,100 barrels (BBL).

Testing and inspection activities were performed in accordance with (IAW) applicable sections of API 653, 5th

Edition. This report contains a detailed account of the tank inspection, non-destructive testing (NDT) methods, and conclusions derived from the inspection and testing activities. Findings from this inspection are further detailed in

Section B – Tank Inspection Comments. Recommended repairs and upgrades identified in Section B are further classified and listed in Section C – Findings and Recommendations.

INSPECTION DATE

API In-Service (External) Inspection Date: 23-24 March 2020

Equipment Used:

Manufacturer: GE Krautkramer Ultrasonic Thickness Gauge

Model Number: DMS GO+

Calibration Method: One-Point Calibration

Manufacturer: Fischer Technologies Dry Film Thickness (DFT) Gauge

Model Number: Dual Scope MPOR

Calibration Method: Calibration to Known Thickness Standard

Manufacturer: Technidea Corporation

Model Number: ZipLevel Pro 2000

Calibration Method: Manufacturer Calibrated

Inspector(s):

Andrew D. Morrissette

Christopher R. Peterson

STATE REGULATIONS

State Regulation for API In-Service Tank Inspections: N/A

State Regulation for API Out-of-Service Tank Inspections: N/A

PREVIOUS INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: February 2011

API In-Service (External) Inspection Date: September 2016

RECOMMENDED FUTURE INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: January 2031*

API In-Service (External) Inspection Date: March 2025

*Out-of-service inspection date based on the previous in-service inspection report dated November 2016.

Andrew D. Morrissette Christopher R. Peterson

Integrity Engineer Integrity Engineer

API 653 Inspector # 80109

ASNT NDT Level I/II

GENERAL TANK INFORMATION

ITEM DESCRIPTION

Owner Georgia ANG

Location Savannah ANG

Facility Number 967

Tank Number 967

State / Country Georgia, USA

City Savannah

Inspection Date 23-24 March 2020

Tank Manufacturer Unknown

Design Standard Unknown

Date of Construction* 1969

Tank Contents Jet-A (F-24)

Tank Serial Number N/A

Tank Diameter 31’-0”

Shell Height 38’-9”

Product Height* 38’-0”

Tank Capacity 5,100 BBL (214,200 Gallons)

Foundation Concrete Ring Wall

Construction

Bottom: Lap-Welded / Double-Bottom*

Shell: Butt-Welded

Fixed Roof: Lap-Welded

Floating Roof: Aluminum Honeycomb Pan

Material

Bottom: Carbon Steel (Unknown Grade)*

Shell: Carbon Steel (Unknown Grade)

Fixed Roof: Carbon Steel (Unknown Grade)

Floating Roof: Aluminum

Cathodic Protection (CP) Impressed Current Cathodic Protection (ICCP)

Interior Coating System Epoxy*

Exterior Coating System Epoxy with Polyurethane Topcoat (Assumed)

Level Gauging Cameron Automatic Tank Gauge (ATG) and Varec Tape Level Gauge (TLG)

Overfill Protection High Level Alarm (HLA) / High-High Level Alarm (HHLA) / High-Level Control

Valve (HLCV) Float Pilot

Piping Receipt: 8-inches Carbon Steel

Main Suction: 8-inches Carbon Steel

Low Suction: 3-inches Carbon Steel

Water Draw-Off: 3-inches Carbon Steel

Level Alarms HLA/HHLA; Low Level Alarm (LLA) / Low-Low Level Alarm (LLLA)

Notes:

*Based on previous in-service inspection report dated November 2016.

A. GENERAL PROJECT INFORMATION

1. API 653 IN-SERVICE (EXTERNAL) INSPECTION

The in-service inspection was performed 23-24 March 2020. Results of this inspection identified recommended repairs/upgrades to fully comply with applicable sections of API 650/653, UFC 3-460-

01/3-460-03, DoD standard AW 78-24-27, NFPA 407, and industry standards.

2. SITE INFORMATION

The 165th Airlift Wing (AW) is located at Savannah/Hilton Head International Airport, Georgia. The

165th AW, which currently flies the C-130H cargo aircraft, was created after World War II in 1946. The unit was officially mobilized first for the Korean War and then again for Operation Iraqi Freedom. The

165th provides air transport for airborne forces, their equipment and supplies with delivery by airdrop or airland, and to provide strategic airlift of personnel, equipment, and supplies.

B. TANK INSPECTION COMMENTS

1. TANK CONSTRUCTION

Tank 967 is a welded, steel, vertical, aboveground Jet-A (F-24) storage tank. The tank was constructed in

1969 by an unknown manufacturer. The tank is 31’-0” in diameter and 38’-9” high with a nominal capacity of 5,100 BBL (214,200 gallons).

2. TANK FOUNDATION

Tank 967 is provided a double bottom with the original tank bottom resting on a concrete ring wall foundation. The foundation-to-walkway joint is not provided with sealant, allowing for fluid to escape in the event of a spill. The tank is provided with leak detection ports between the original and secondary tank bottom. Leak detection ports are not provided with valves or caps and are open to the atmosphere.

Leak detection ports should allow for manual opening to inspect for leaks.

A settlement evaluation was performed during the inspection. The settlement evaluation was unsatisfactory based on data collected; however, no visual signs of excessive shell stress or settlement were observed. Settlement should be monitored during future inspections.

See Appendix A for settlement results.

3. CATHODIC PROTECTION

The tank is equipped with an ICCP system for protecting the tank bottom from corrosion. According to the previous CP survey report dated July 2018, the tank is receiving adequate CP based on NACE

International -850 millivolt polarized potential criteria.

4. TANK SHELL

The tank shell is equipped with five (5) fully coated, butt-welded, steel courses. Shell plates were examined using ultrasonic thickness testing (UTT) and visual testing (VT) methods. Nine (9) UTT measurements were taken on each plate of the 1st shell course. Ten (10) UTT measurements were taken on each of the 2nd through 5th shell courses using the spiral staircase for access. UTT measurements indicated no significant signs of metal loss on shell plates.

The CP junction box is mounted on the tank shell by two (2) strut supports. The supports are not fully seal welded to the tank shell, allowing a crevice for water to collect. No crevice corrosion was observed during the inspection. There is no nameplate provided for the tank to list construction and design data.

Refer to Drawing A-1, “Shell Layout”, in Appendix A for shell plate locations and Table 1, “Shell UTT

Measurements”, in Appendix A for shell plate UTT measurements.

5. FIXED ROOF

The tank fixed roof was examined using UTT and VT methods. Five (5) UTT measurements were taken on each fixed roof plate. UTT measurements indicated no significant signs of metal loss on fixed roof plates.

The fixed roof is equipped with a partial perimeter handrail. Fixed roof full perimeter handrails provide safe access to fixed roof appurtenances and nozzles for maintenance and testing.

Refer to Drawing A-2, “Fixed Roof Layout”, in Appendix A for fixed roof plate locations and Table 2, “Fixed Roof UTT Measurements”, in Appendix A for fixed roof plate UTT measurements.

6. TANK APPURTENANCES

a. TANK SHELL

Shell nozzles were examined using UTT and VT methods. Four (4) UTT readings were taken on every nozzle larger than 2-inches, and two (2) UTT readings were taken on nozzles 2-inches or less. One (1) UTT reading was taken on each associate reinforcement pad.

Tank 967 is equipped with twenty-five (25) shell nozzle penetrations: two (2) 36-inch manways, two (2) 1 ½-inch HHLA penetrations, two (2) 1 ½-inch HLA penetrations, two (2)

1 ½-inch threaded plugs, one (1) 3-inch aqueous film forming foam (AFFF), one (1) 8-inch receipt, two (2) 1-inch threaded plugs, two (2) 1-inch HLCV float pilot penetrations, two (2)

2-inch LLA penetrations, two (2) 2-inch LLLA penetrations, one (1) 8-inch main suction, one

(1) 3-inch low suction, and one (1) 3-inch water draw-off.

Coating for each of the manways, the spiral staircase, LLA, LLLA, receipt, main suction, low suction, water draw-off, and tank chime exhibits flaking, cracking, and base metal exposure with surface corrosion. Confined space labeling at each manway is faded.

Refer to Drawing A-1, “Shell Layout”, in Appendix A for shell nozzle locations and Table 3, “Shell Nozzle/Repad UTT Measurement”, in Appendix A for nozzle and associated reinforcement pad UTT measurements.

b. FIXED ROOF

Fixed roof nozzles were examined using UTT and VT methods. Four (4) UTT readings were taken on every nozzle larger than 2-inches, and two (2) UTT readings were taken on nozzles

2-inches or less. One (1) UTT reading was taken on each associate reinforcement pad.

The fixed roof is provided thirteen (13) nozzle penetrations: two (2) 3-inch internal floating roof (IFR) anti-rotation cables, two (2) 3-inch IFR grounding cables, one (1) 8-inch Cameron

ATG, two (2) 24-inch x 24-inch inspection hatches, two (2) 4-inch scaffold supports, one (1)

24-inch center vent, one (1) 8-inch manual gauging hatch, one (1) 2-inch Varec TLG, and one

(1) 72-inch x 24-inch IFR installation hatch.

External coating on the fixed roof, IFR inspection hatch, one (1) scaffold support, manual gauging hatch, Cameron ATG, handrails, and Varec TLG exhibits areas of topcoat chalking and base metal exposure with surface corrosion. Fasteners on the manual gauging hatch exhibit corrosion.

The center vent nozzle neck exhibits through holes, allowing water ingress into the top of the

IFR pan. Tank roofs, seals, and fittings of all types must be maintained in good, weather-tight condition. Through holes are coated and corrosion at these locations is considered inactive.

The center vent is not provided with a reinforcement pad. Coating on the IFR inspection hatch, one (1) scaffold support, manual gauging hatch, Cameron ATG, handrails, and Varec

TLG exhibits topcoat checking and base metal exposure with surface corrosion. Fasteners on the manual gauging hatch exhibit corrosion. Neither of the IFR inspection hatches are equipped with a ladder for access to the topside of the IFR. Confined space labeling on the inspection hatches exhibit fading and peeling.

Refer to Drawing A-2, “Fixed Roof Layout”, in Appendix A for shell nozzle locations and Table

3, “Shell Nozzle/Repad UTT Measurement”, in Appendix A for nozzle and associated reinforcement pad UTT measurements.

c. GAUGING

The tank is provided a manual gauging hatch for manual gauging and sampling operations. A

Cameron ATG system is provided for automatic tank gauging. According to facility personnel, the Cameron ATG system is in working order. DLA ATG Installation Policy requires that Tank

967 be equipped with and Enraf ATG and Vito temperature/water probe. A mechanical Varec

TLG is provided for monitoring product level from the ground. The TLG did not pass the field operability check and currently reads an inaccurate product height.

d. LEVEL ALARMS

The tank is provided with independent, shell mounted alarms in the low, low-low, high, and high-high positions as well as a HLCV float pilot for overfill protection. According to facility personnel, all level alarms and the HLCV float pilot are functioning properly. The level alarms are provided with threaded connections at the tank nozzle and on associated piping.

Threaded connections are no longer used as they are a potential leak path.

e. STAIRS AND PLATFORMS

The tank is provided a spiral staircase with one (1) upper platform for fixed roof access. The

HHLA extends into the path of the spiral staircase, allowing 24 ½-inches clearance between the appurtenance and staircase railing. OSHA mandates a minimum 26-inches clearance between appurtenances and staircase railings.

f. GROUNDING AND BONDING

The tank shell is equipped with two (2) grounding cables. Grounding cables are in good condition with no sign of damage or deterioration. AW requires a minimum of four (4) grounding lugs be installed on tanks to adequately dissipate electrical static buildup.

7. TANK AND PIPING COATING

Coating for the tank shell and piping is assumed to be an epoxy/polyurethane coating system. External tank shell coating exhibits widespread chalking, indicating the polyurethane topcoat is near the end of its life cycle. Prior to recoat, it is recommended to perform a coating condition survey, including an adhesion test, to determine whether a full recoat is required or if a topcoat reapplication will suffice. Bio-growth was observed on the tank chime coating, potentially acting as a catalyst for coating deterioration.

Piping coating exhibits widespread flaking, cracking, deterioration, and base metal exposure with surface corrosion. A full recoat of the piping system should be programmed in the near future.

8. TANK PIPING SYSTEM

Piping within the containment dike is constructed of carbon steel. Product designation labeling and flow arrows for the receipt and suction piping exhibit fading and peeling. Four (4) piping penetrations at the vertical dike wall are provided with sealant at the piping-to-penetration interface. The sealant exhibits cracking and deterioration.

Thermal relief valves (TRV) and associated crossover piping at the receipt and main suction are provided with sight flow indicators, threaded connections, and are not provided test tees. The product recovery tank (PRT) piping is provided threaded connections. Threaded connections and sight flow indicators are no longer used in this application as they are potential leak paths.

9. FIRE PROTECTION SYSTEM

For internal fire protection, an aluminum honeycomb IFR is provided. The tank is also equipped with an

AFFF system. The AFFF system is no longer needed and should be removed with approval of base civil engineering.

10. SECONDARY CONTAINMENT

Tank 967 is located within a gravel covered geotextile liner. The liner exhibits tearing, fraying, and widespread vegetation growth. The containment dike is provided with three (3) concrete sloped walls and one (1) vertical wall. A concrete walkway is provided around the tank perimeter and exhibits cracking, allowing for fluid to escape in the event of a spill. Control joints for the walkway and dike walls are not provided sealant.

C. FINDINGS AND RECOMMENDATIONS

Based on the in-service API 653 inspection of Tank 967 located at Savannah ANG in Savannah, Georgia, repair/upgrade recommendations have been identified. The following recommendations outline observations from this inspection. All repair recommendations are based on applicable sections of API

650/653, UFC 3-460-01/3-460-03, DoD Standard AW 78-24-27, NFPA 407, and industry standards.

1. MANDATORY REPAIRS PER API 653, UFC 3-460-01, OR DoD 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 be taken out of service until these repairs are completed.

No mandatory repairs are required to remove Tank 967 from service.

2. SHORT-TERM RECOMMENDED REPAIRS

Short-term repairs that directly relate to the long-term preservation of the asset. Short-term 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 may be required by federal, state and local codes or by military criteria.

2.1 Center Vent

OBSERVATION: The 24-inch center vent is not provided a reinforcement pad.

REFERENCE: API 650, Table 5.14

RECOMMENDATION: Provide the fixed roof center vent with a reinforcement pad.

2.2 Center Vent

OBSERVATION: The center vent exhibits through holes on the nozzle neck.

REFERENCE: API 653, Section 4.2.1.1; UFC 3-460-03, Section 2-4.2

RECOMMENDATION: Provide repair to the center vent nozzle neck or provide a new nozzle.

2.3 Fixed Roof Coatings

OBSERVATION: Coating on the fixed roof, IFR inspection hatch, scaffold support, manual gauging hatch, Cameron ATG, handrails, and TLG exhibits topcoat checking and base metal exposure with surface corrosion.

REFERENCE: UFC 3-460-03, Section 8-3.1

RECOMMENDATION: Provide approximately 60 ft2 of spot coating repair on the fixed roof, nozzles, and appurtenances.

2.4 Cameron ATG

OBSERVATION: Tank 967 is provided with a Cameron ATG.

REFERENCE: DLA ATG Installation Policy

RECOMMENDATION: Provide the tank with an Enraf ATG and Vito temperature/water probe.

2.5 Tank Shell Nozzles and Appurtenances Coating

OBSERVATION: External coating on Manway 1 and 2, spiral staircase, LLA/LLLA, receipt, main suction, low suction, water draw-off, and tank chime exhibits flaking, cracking, and base metal exposure with surface corrosion.

REFERENCE: UFC 3-460-03, Section 6-10.1.1

RECOMMENDATION: Provide approximately 100 ft2 of coating repair on tank shell nozzles and appurtenances.

2.6 Tank Shell Coating

OBSERVATION: External coating for the tank shell exhibits widespread chalking.

REFERENCE: UFC 3-460-03, Section 8-3.1

RECOMMENDATION: Provide a full recoat of the tank shell, approximately 4,450 ft2. Prior to recoat, perform a coating condition survey to determine if a full recoat is required or if a topcoat reapplication will suffice.

2.7 Varec TLG

OBSERVATION: The Varec TLG did not pass the field operability test and reads an inaccurate product height.

REFERENCE: UFC 3-460-03, Section 8-9.7.1

RECOMMENDATION: Repair or replace the Varec TLG.

2.8 Leak Detection Ports

OBSERVATION: Leak detection ports are currently open to the atmosphere.

REFERENCE: AW 78-24-27, Sheet D.03 Detail 2; UFC 3-460-03, Section 8-9.13.4

RECOMMENDATION: Provide caps or valves for each of the nine (9) leak detection ports around the tank perimeter. Valves or caps should be left in the normally closed position and monitored regularly IAW UFC requirements.

2.9 TRVs

OBSERVATION: TRVs and associated crossover piping at the receipt and main suction are provided with sight flow indicators, threaded connections, and not provided test tees.

REFERENCE: AW 78-24-27, Sheet D.10 Detail 4; UFC 3-460-01, Section 9-3.5.1

RECOMMENDATION: Provide standard TRV and associated crossover piping IAW AW and UFC standards.

2.10 Level Alarms

OBSERVATION: The HLA, HHLA, LLA, an LLLA are provided with threaded connections. According to facility personnel, all level alarms are functioning properly.

REFERENCE: UFC 3-460-01, Section 8-11

RECOMMENDATION: Provide socket welded or flanged connections for the HLA, HHLA, LLA, and LLLA shell penetrations.

2.11 CP Junction Box Supports

OBSERVATION: Supports for the CP junction box are not fully seal welded to the tank shell, allowing a crevice for water to collect. This configuration can accelerate coating deterioration and corrosion. No crevice corrosion was observed at the supports.

REFERENCE: UFC 3-460-01, Section 8-11

RECOMMENDATION: Provide full seal welds at each of the CP junction box supports on the tank shell.

2.12 Tank Grounding

OBSERVATION: The tank is provided with two (2) grounding cables. AW requires that a minimum of four (4) grounding lugs are installed on tanks to adequately dissipate electrical static buildup.

REFERENCE: AW 78-24-27, Sheet ED.02; API 650, Section 5.8.11.3

RECOMMENDATION: Provide two (2) additional grounding cables for the tank.

2.13 HLCV Float Pilot

OBSERVATION: The HLCV float pilot has no means to access for regular maintenance and testing.

REFERENCE: UFC 3-460-03, Section 8-9.6.1.1

RECOMMENDATION: Provide an access platform to facilitate testing and maintenance of the HLCV float pilot.

2.14 PRT Piping

OBSERVATION: PRT piping is provided threaded connections.

REFERENCE: UFC 3-460-01, Section 9-8 (e)

RECOMMENDATION: Provide socket welded or flanged connections for the PRT piping.

2.15 Piping Coating

OBSERVATION: External coating on piping within the containment dike exhibits widespread flaking, cracking, deterioration, and base metal exposure with surface corrosion.

REFERENCE: UFC 3-460-03, Section 6-10.1.1

RECOMMENDATION: Provide a recoat of approximately 1,000 ft2 (100%) of piping within the containment dike.

2.16 Piping Dike Wall Penetrations

OBSERVATION: Four (4) piping penetrations at the vertical dike wall are provided with sealant at the piping-to-penetration interface. The sealant exhibits cracking and deterioration.

REFERENCE: UFC 3-460-01, Section 6-10.1.1

RECOMMENDATION: Provide link seals at each of the four (4) piping penetrations at the vertical dike wall.

2.17 Foundation-to-Walkway Joint

OBSERVATION: The foundation-to-walkway joint is not provided with sealant, allowing a pathway for fluid to escape in the event of a spill.

REFERENCE: UFC 3-460-03, Section 8-10.2.2 (c)

RECOMMENDATION: Provide approximately 105 linear feet of flexible, fuel-resistant, UV-resistant sealant at the foundation-to-walkway joint.

2.18 Secondary Containment Control Joints

OBSERVATION: Concrete walkway and dike sloped wall control joints are not provided with sealant.

REFERENCE: UFC 3-460-03, Section 8-10.2.1 (d); UFC -460-03, Section 8.10.2.2 (c)

RECOMMENDATION: Provide approximately 700 linear feet of flexible, fuel-resistant, UV-resistant sealant at walkway and sloped wall control joints.

2.19 Secondary Containment Cracking

OBSERVATION: Cracking was observed in the concrete walkway.

REFERENCE: UFC 3-460-03, Section 8-10.2.2 (c)

RECOMMENDATION: Provide approximately 10 linear feet of flexible, fuel-resistant, UV-resistant sealant at cracking in the walkway.

3. LONG-TERM RECOMMENDED REPAIRS

Long-term repairs that directly relate to repair/upgrade of an asset to bring it up to the current standard from the standard at time of construction. Long-term 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.

3.1 Manual Gauging Hatch

OBSERVATION: Fasteners on the manual gauging hatch exhibit general corrosion.

REFERENCE: BMP

RECOMMENDATION: Replace eight (8) fasteners at the manual gauging hatch with stainless steel fasteners and provide isolation at each fastener.

3.2 Fixed Roof Handrail

OBSERVATION: The tank fixed roof is provided with a partial perimeter handrail.

REFERENCE: AW 78-24-27, Sheet D.11 Detail 5

RECOMMENDATION: Provide a full perimeter handrail for the fixed roof.

3.3 IFR Inspection Hatch

OBSERVATION: The IFR inspection hatch does not have a ladder for access to the top side of the

IFR.

REFERENCE: AW 78-24-27, Sheet D.09 Detail 3

RECOMMENDATION: Provide a ladder of the IFR inspection hatch in order to access the top side of the

IFR.

3.4 Inspection Hatch Confined Space Labeling

OBSERVATION: Confined space labeling at each of two (2) fixed roof inspection hatches exhibits fading and peeling.

REFERENCE: UFC 3-460-01, Section 2.17 (b)

RECOMMENDATION: Replace confined space labeling at each of the two (2) fixed roof inspection hatches.

3.5 Manway Confined Space Labeling

OBSERVATION: Confined space labeling at each of two (2) shell manways is faded.

REFERENCE: UFC 3-460-01, Section 2.17 (b)

RECOMMENDATION: Replace confined space labeling at each of the two (2) shell manways.

3.6 AFFF

OBSERVATION: Tank 967 is provided with an AFFF system; however, an IFR is provided for fire protection.

REFERENCE: UFC 3-460-01, Section 2-14.2.2

RECOMMENDATION: Remove the AFFF discharge chamber and associated piping with approval of base civil engineering. If approval is not granted, coat the piping red IAW MIL-STD-

161H. Note that AFFF piping is constructed of galvanized steel and provided with threaded connections.

3.7 Tank Chime

OBSERVATION: The tank chime exhibits widespread bio-growth.

REFERENCE: BMP

RECOMMENDATION: Pressure wash the coating on the tank chime.

3.8 Tank Nameplate

OBSERVATION: The tank is not provided with a nameplate.

REFERENCE: API 650, Section 10.1

RECOMMENDATION: Provide the tank with a corrosion-resistant nameplate IAW API 650.

3.9 Spiral Staircase

OBSERVATION: Clearance between the HHLA and spiral staircase railing is 24 ½-inches, which is less than the 26-inch clearance required by OSHA.

REFERENCE: OSHA 1910.25(d)(1)

RECOMMENDATION: Extend the spiral staircase treads to allow proper clearance or provide a work platform for the HHLA.

3.10 Secondary Containment Geotextile Liner

OBSERVATION: The secondary containment geotextile liner exhibits tearing, fraying, and widespread vegetation growth.

REFERENCE: BMP

RECOMMENDATION: Repair approximately 50 square feet of tearing and fraying of the geotextile liner and remove vegetation growth from the secondary containment.

3.11 Product Labeling

OBSERVATION: Product designation labeling and flow arrows for the piping exhibit fading and peeling.

REFERENCE: UFC 3-460-01, Section 2-17

RECOMMENDATION: Provide product designation labeling and flow arrows for piping IAW MIL-STD-

161H.

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

NOZZLE

SCHEDULE

NOZZLE SIZE SHELL LAYOUT

MW1 36" MANWAY

N1 1 1/2" HHLA

N2 1 1/2" HHLA

N3 1 1/2" HLA

N4 1 1/2" HLA

N5 1 1/2" THREADED PLUG

N6 1 1/2" THREADED PLUG

MW2 36" MANWAY

N7 - AFFF

N8 8" RECEIPT

N9 - THREADED PLUG

N10 - HLCV

N11 - THREADED

N12 - HLCV

N13 2" LLA

N14 2" LLA

N15 2" LLLA

N16 2" LLLA

N17 8" MAIN SUCTION

N18 3" LOW SUCTION

N19 3" WATER DRAW OFF

8'-0"

1-2

LEAK DETECTION

PORT (TYP. 9)

GROUNDING

CABLE (TYP. 2)

8'-0"

8'-0"

8'-0"

6'-6"

1-1 1-2

2-4 2-1 2-2 2-3

3-4 3-1 3-2

4-3 4-4 4-1 4-2

5-3 5-4 5-15-2

VAREC TLG

VAREC

.248"

.253"

.254" .250"

.249" .248"

.250"

.251"

MW1

N1

N2

N3

N4

N6

N5

N12

N10

N11

MW2

N13

N14

N16

N15

N8

N17

N18 N19

N7

N9

OVERFLOW

VENT (TYP. 2)

TLG SUPPORT

(TYP. 2)

ABANDONED

THREADOLET

(TYP. 4)

AFFF SUPPORT

(TYP. 6)

3-3

C O

N T

R A

C T

N

O

F I L E

A M

E

D W

N

B

Y

C K

D

B

Y

D E

S I G

N E

D

B

Y

D E

S C

R I P

T I O

N

D

2 3

C

A

B

M A

R K

A P

P R

D A

T E

F I

U M

B E

R

S I Z

E

S U

B M

I T

T E

D

B

Y

P L O

T

S

C A

L E

P

L O

T

D

A T

E

D A

T E

M A

R K

D E

S C

R I P

T I O

N

D E

L I V

E R

Y

O

R D

R

SHEET

IDENTIFICATION

D A

T E

A P

P R

SHEET OF

U S

A

R M

Y

C

O R

P S

F

E

N G

I N

E E

R S

O M

A H

A

N

E

O M

A H

A

D

I S

T R

I C

T

S A

V A

N N

A H

G

A

S A

V A

N N

H

G

T A

K

L A

Y O

U T

N T

S

N A

W F

D

W F

F

A N

S I

B a r k w a y

L a n e

S u i t e

P e a c h t r e e

C o r n e r s

G

A

P h o n e

F a x

J O

B

N

O

A D

M

A E

C

C R

P

N A

TANK INFORMATION

TANK NO.: TANK 967

MANUFACTURER: UNKNOWN

YEAR BUILT: 1969

TANK DIAMETER: 31'-0"

TANK HEIGHT: 38'-9"

NOMINAL CAPACITY: 5,100 BBL

PRODUCT: JET-A (F-24)

PRODUCT SPECIFIC GRAVITY: UNKNOWN

GPS COORDINATES: 32.11328°, -81.18876°

N A

S H

E L L

L A

Y O

U T

A-1

NOTES:

1. REFER TO TABLE 1, "SHELL UTT MEASUREMENTS", IN

APPENDIX A FOR INDIVIDUAL SHELL PLATE UTT

READINGS.

2. REFER TO TABLE 3, "SHELL NOZZLE/REPAD UTT

MEASUREMENTS", FOR NOZZLE DATA.

LEGEND:

UTT READINGXXX"

SPIRAL

STAIRCASE

NOZZLE

SCHEDULE

NOZZLE SIZE FIXED ROOF LAYOUT

N20 3" IFR ANTI-ROTATION CABLE

N21 3" IFR GROUNDING CABLE

N22 8" CAMERON ATG

N23 24" x 24" INSPECTION HATCH

N24 4" SCAFFOLD SUPPORT

N25 24" CENTER VENT

N26 8" MANUAL GAUGING HATCH

N27 24" x 24" INSPECTION HATCH

N28 4" SCAFFOLD SUPPORT

N29 2" VAREC TLG

N30 72" x 24" IFR INSTALLATION HATCH

N31 3" IFR GROUNDING CABLE

N32 3" IFR ANTI-ROTATION CABLE

N25

N23

N27

N20

N21

N22

N24

N26

N28

N29

N30

N31

N32

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

PERIMETER

HANDRAIL

CHAIN

PERIMETER HANDRAIL

SUPPORT (TYP. 7)

C O

N T

R A

F I

M

E

D W

N

B

Y

C K

D

B

Y

D E

S I G

N E

D

B

Y

D E

S C

R I P

T I O

N

D

2 3

C

A

B

M A

R K

A P

P R

D A

T E

F I

M

B E

R

S I Z

E

S U

B M

I T

T E

D

B

Y

P L O

T

S

C A

L E

P

L O

T

D

A T

E

D A

T E

M A

R K

D E

S C

R I P

T I O

N

D E

L I V

E R

Y

O

R D

SHEET

IDENTIFICATION

D A

T E

A P

P R

SHEET OF

U S

A

R M

Y

C

O R

E

N G

I N

E E

R S

O M

A H

A

N

E

O M

A H

A

D

I S

T R

I C

T

S A

V A

N N

A H

G

A

S A

V A

N N

G

T A

L A

Y O

U T

N T

S

N A

W F

D

W F

F

A N

S I

B r k w a y

L a n e

S u i

P e a c h t r e e

C o r n e r s

G

A

P h o n e

F a x

J O

B

N

O

A D

M

A E

C

C R

P

N A

TANK INFORMATION

TANK NO.: TANK 967

MANUFACTURER: UNKNOWN

YEAR BUILT: 1969

TANK DIAMETER: 31'-0"

TANK HEIGHT: 38'-9"

NOMINAL CAPACITY: 5,100 BBL

PRODUCT: JET-A (F-24)

PRODUCT SPECIFIC GRAVITY: UNKNOWN

GPS COORDINATES: 32.11328°, -81.18876°

N A

F I X

D

O

F

L A

Y O

U T

A-2

C O

N T

R A

F I

M

E

D W

N

B

Y

C K

D

B

Y

D E

S I G

N E

D

B

Y

D E

S C

R I P

T I O

N

D

2 3

C

A

B

M A

R K

A P

P R

D A

T E

F I

M

B E

R

S I Z

E

S U

B M

I T

T E

D

B

Y

P L O

T

S

C A

L E

P

L O

T

D

A T

E

D A

T E

M A

R K

D E

S C

R I P

T I O

N

D E

L I V

E R

Y

O

R D

SHEET

IDENTIFICATION

D A

T E

A P

P R

SHEET OF

U S

A

R M

Y

C

O R

E

N G

I N

E E

R S

O M

A H

A

N

E

O M

A H

A

D

I S

T R

I C

T

S A

V A

N N

A H

G

A

S A

V A

N N

G

T A

L A

Y O

U T

N T

S

N A

W F

D

W F

F

A N

S I

B r k w a y

L a n e

S u i

P e a c h t r e e

C o r n e r s

G

A

P h o n e

F a x

J O

B

N

O

A D

M

A E

C

C R

P

N A

TANK INFORMATION

TANK NO.: TANK 967

MANUFACTURER: UNKNOWN

YEAR BUILT: 1969

TANK DIAMETER: 31'-0"

TANK HEIGHT: 38'-9"

NOMINAL CAPACITY: 5,100 BBL

PRODUCT: JET-A (F-24)

PRODUCT SPECIFIC GRAVITY: UNKNOWN

GPS COORDINATES: 32.11328°, -81.18876°

N A

LEGEND:

COATING FAILURE

NOTES:

1. REFER TO TABLE 1, "SHELL UTT MEASUREMENTS", IN

APPENDIX A FOR INDIVIDUAL SHELL PLATE UTT

READINGS.

2. REFER TO TABLE 2, "FIXED ROOF ULTRASONIC

THICKNESS READINGS", IN APPENDIX A FOR INDIVIDUAL

ROOF PLATE UTT READINGS.

API-653 APPENDIX B SHELL SETTLEMENT EVALUATION

(para. B.2.2.4)

Report No Client Inspector Vessel Date Savannah ANG

Tank 967 USACE Andrew Morrissette (POND) Tank 967 04/08/2020

Base Elev Max Elev Elev

FT 1.510 1.625 0.115 R^2 = 0.545

IN 18.120 19.500 1.380

MorrissetteA Snapshot

(para. B.2.2.5) Report No. Client Inspector Vessel Date

Savannah ANG Tank 967 USACE Andrew Morrissette

(POND) Tank 967 4/8/2020

Base Elev Max Elev Elev

FT 1.510 1.625 0.115

IN 18.120 19.500 1.380

Report No.: Savannah ANG Tank 967

D H Roof Type 1st Crs Plt Spec Y E K

31 38.8 F Unknown 30000 29000000 10.500

Where:

D = Tank Diameter, in ft H = Tank Height, in ft Roof Type: F = fixed, O = Open Y = Yield strength of shell 1st course , in pounds per Sq.Inch (psi) E - Young's modulus, in pounds per Sq.Inch (psi) K = factor from table in B.3.2.2 (API-653 App. B) PE2 = Predicted elevation (for secondary evaluation), in ft Sarc = the effective settlement arc length, see B.2.2.5.1, in ft Si = out-of-plane settlement, in inch Smax = Maximum allowed out-of-plane settlement, in inch (min(K*Sarc*(D/H)*(Y/E), 4.0)

Point Elevation PE2 Sarc Si Smax Results

1 1.510 0 1.604 24.3 1.128 0.211 UNSAT

2 1.583 45 1.583 36.5 0.000 0.317 SAT

3 1.563 90 1.576 36.5 0.160 0.317 SAT

4 1.563 135 1.570 36.5 0.080 0.317 SAT

5 1.563 180 1.563 36.5 0.000 0.317 SAT

6 1.510 225 1.584 36.5 0.884 0.317 UNSAT

7 1.542 270 1.604 36.5 0.748 0.317 UNSAT

8 1.625 315 1.625 24.3 0.000 0.211 SAT

PetersonC Text Box The maximum measure out-of-plane deflection is 1.128 inches and maximum allowable deflection is 0.211 inches; therefore, the tank is not within API 653 acceptable limits. The allowable deflection of the tank is not accurately represented by the above analysis due to the small size of the tank which results in a small arc length. No visual settlement was identified during the inspection. It is recommended to monitor the tank settlement during future inspections.

SHELL MINIMUM THICKNESS CALCULATIONS

Tank Shell Minimum Thickness and Remaining Life Calculations Date 04/08/2020

File No. Report No. Client Tank No. Temp. (degF) Initials

3776 Savannah ANG Tank

USACE Tank 967 Andrew Mo tmin = 2.6(H-1)DG

SE

Where:

H = The height above the bottom of the course of study to the maximum liquid level height of the product, in ft. For corroded or pitted areas, H = the height from the bottom of the corroded or pitted area to the maximum liquid level height of the product, in ft.

tmin = The calculated minimum acceptable shell thickness, in inch (cannot be less than

0.10 inch for any course). The minimum acceptable shell thickness allowed by API-653 and STI-SP001 for tank size, in inch .

D = Nominal diameter of tank, in ft.

G = Highest specific gravity of the contents (including test water if tank will, or may, be tested in the future).

S = Maximum allowable stress, in psi. For welded tanks; use the smaller of 0.80Y of 0.429T for bottom and second course or the smaller of 0.88Y or 0.472T for all other courses. For riveted tanks; S = 21000 psi. For STI Tank Inspections S = 26000 psi (E = 1)

Y = Specified minimum yield strength of the plate, in psi; use 30000 psi if not known (N/A for riveted tanks).

T = The smaller of the specified minimum tensile strength of the plate or 80000 psi; use 55000 psi if not known (N/A for riveted tanks).

E = Original joint efficiency for the tank. For welded tanks; use API-653, Table 2-1 ; use 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 greater than 1 inch away from rivets; use the value of E from API- 653 Table 2-1 when within 1 inch of rivets. For STI Tank Inspections E = 1 where S = 26000 psi.

D (ft) 31 G 0.84 E 0.85 Fill Height (ft) 38.0

Material Crs H (ft) H (ft) S (psi) tmin (inch) Course 1 Unknown 6.50 38.0 23600 0.125 Course 2 Unknown 8 31.5 23600 0.103 Course 3 Unknown 8 23.5 26000 0.100 Course 4 Unknown 8 15.5 26000 0.100 Course 5 Unknown 8 7.5 26000 0.100

SHELL REMAINING LIFE CALCULATIONS

Tprev is based on UTT readings from the previous in-service inspection report dated November 2016.

Tank Shell Minimum Thickness and Remaining Life Calculations Date 04/08/2020

File No. Report No. Client Tank No. Temp. (degF) Initials

3776 Savannah ANG Tank

USACE Tank 967 Andrew Mo

Ca = tact-tmin = Remaining Corrosion Allowance (inch) Cr = tprev-tact / Y = Corrosion Rate (inch/Yr) RL = Ca / Cr = Remaining Life (year)

Y = 4 = Tank age (year)

Where:

Ca = Remaining corrosion allowance of the shell course under consideration, in inch.

Cr = Corrosion rate of the shell course under consideration, in inch per year.

FHc = Calculated fill Height = (SEtact/2.6DG+1) + (product height below course of interest), in ft.

tact = Minimum thickness measurement of the shell course under consideration, as recorded at the time of inspection, in inch.

tmin = minimum required thickness of shell course, at the maximum allowable fill height, in inch.

tprev = previous thickness measurement of shell course under consideration, as recorded at last inspection or nominal thickness if no previous thickness measurements, in inch.

RL = Estimated remaining life of the shell course under consideration, in year.

Y = Time span between thickness readings or age of the tank if nominal thickness is used for tprev, in year.

tprev tact tmin Ca Cr RL FHc Course 1 0.261 0.258 0.125 0.133 0.0008 177 77.44 Course 2 0.267 0.262 0.103 0.159 0.0013 127 85.13 Course 3 0.252 0.251 0.100 0.151 0.0003 604 97.43 Course 4 0.260 0.268 0.100 0.168 0.0000 >40 110.98 Course 5 0.258 0.254 0.100 0.154 0.0010 154 114.41

AST ATMOSPHERIC STORAGE TANK FIXED ROOF EVALUATION

MINIMUM THICKNESS, REMAINING LIFE, PRESSURE CALCULATIONS

Date 04/08/2020

File No Report No Client Inspector Tank No Temp(degF)

Savannah ANG Tank

USACE

Andrew Morrissette

(POND)

Tank 967

Where;

Ca = remaining corrosion allowance of the tank component under consideration, in inch (t act - t min).

Cr = corrosion rate of the tank component under consideration, in inch per year (t prev - t act / Y).

oz = unit of measurement, (weight, in ounces, per square inch), (16 oz per pound) psi = unit of measurement, (weight, in pounds, per square inch) RL = estimated remaining life of the tank component under consideration, in year (Ca / Cr).

t act = actual thickness measurement of the tank component under consideration, as recorded at the time of inspection, in inch.

t min = minimum required thickness of tank component, at the design MAWP at the design temperature (200 degF for atm AST's), in inch (greater of psi/wt or 0.090").

t nom = design nominal thickness of tank component under consideration, in inch.

t prev = previous thickness measurement of the tank component under consideration, as recorded at last inspection or nominal thickness if no previous thickness measurements, in inch.

t yn = thickness of the tank component under consideration at the next inspection at twice the calculated corrosion rate, in inch (t act - (2*Cr*Yn).

wt = weight of plate per cubic inch.

wc = unit of measurement, (height, in inch, of water column bearing on 1 Sq.Inch area), (27.7 wc per pound) Y = time span between thickness readings or age of the tank component if tnom is used for tprev, in year.

Yn = estimated time span to next inspection of the tank component under consideration, in year.

ROOF PLATES - REMAINING LIFE

Y t prev (inch) t act (inch) t min (inch) Cr (inch/Yr) Ca (inch) RL

4 0.187 0.185 0.090 0.00050 0.095 190

MorrissetteA Snapshot

TABLE 1 - SHELL UTT MEASUREMENTS

Fixed Roof

Shell

Course

Plate 5-1 Plate 5-2 Plate 5-3 Plate 5-4

.241 .266 .260

.241 .257 .255

.241 .265 .256

.253

Avg. .254

Circumferential Weld C5

Shell

Course

Plate 4-1 Plate 4-2 Plate 4-3 Plate 4-4

.267 .270 .267

.269 .266 .268

.270 .268 .266

.267

Avg. .268

Circumferential Weld C4

Shell

Course

Plate 3-1 Plate 3-2 Plate 3-3 Plate 3-4

.254 .255 .251

.255 .255 .249

.243 .253 .248

.246

Avg. .251

Circumferential Weld C3

Shell

Course

Plate 2-1 Plate 2-2 Plate 2-3 Plate 2-4

.261 .264 .260

.265 .264 .260

.267 .259 .261

.260

Avg. .262

Circumferential Weld C2

Shell

Course

Plate 1-1 Plate 1-2

.270 .272 .272 .250 .252 .250 .251 .256 .250 .257 .255 .257

.272 .272 .274 .253 .256 .249 .254 .257 .249 .259 .257 .257

.271 .271 .274 .252 .253 .250 .253 .256 .249 .259 .252 .253

Avg. .272 .252 .253 .256

Circumferential Weld C1

Thickness represented in inches.

Average shell course 1: .258”

Average shell course 2: .262”

Average shell course 3: .251”

Average shell course 4: .268”

Average shell course 5: .254”

TABLE 2 – FIXED ROOF UTT MEASUREMENTS

Plate 1 Plate 2 Plate 3 Plate 4 Plate 5

.183 .183 .177 .178 .179 .177 .182 .179 .182 .179

.186 .181 .180 .183 .182

.184 .186 .184 .182 .178 .178 .183 .181 .181 .181

Avg. .184 .180 .178 .182 .181

Plate 6 Plate 7 Plate 8 Plate 9 Plate 10

.179 .188 .183 .185 .191 .192 .196 .195 .190 .193

.181 .182 .195 .195 .198

.181 .182 .180 .181 .193 .192 .196 .195 .187 .190

Avg. .182 .182 .193 .195 .192

Plate 11 Plate 12 Plate 13 Plate 14 Plate 15

.183 .184 .181 .182 .184 .183 .186 .194 .180 .180

.185 .184 .184 .195 .178

.183 .187 .181 .183 .184 .181 .188 .195 .178 .180

Avg. .184 .182 .183 .192 .179

Plate 16

.189 .188 .191 .194 .188

Avg. .190 Thickness represented in inches.

Average fixed roof: .185”

TABLE 3 - NOZZLE / REPAD UTT MEASUREMENTS

Nozzle Nozzle Size

(Diameter or Width/Height)

Repad Shape

Repad Size (W X H)

Repad Thickness

Nozzle Thickness H1 H2

Nozzle Location (Measured circumferentially from Manway 1)

Notes

0⁰ 90⁰ 180⁰ 270⁰

MW1 36" B 73" .260 .362 .362 .353 .364 3'-4" 2'-0" 0'-0" Manway

N1 1 ½" - - - TH TH TH TH 4'-9 ¾" 4'-9" 36'-6" HHLA

N2 1 ½" - - - TH TH TH TH 3'-4" 3'-2 ¼" 36'-6" HHLA

N3 1 ½" - - - TH TH TH TH 4'-1 ¼" 4'-1 ½" 39'-8" HLA

N4 1 ½" - - - TH TH TH TH 2'-6 ½" 2'-5 ¾" 39'-8" HLA

N5 1 ½" - - - TH TH TH TH 1'-6" 1'-5 ¼" 41'-2" Threaded Plug

N6 1 ½" - - - TH TH TH TH 2'-6 ½" 2'-5 ¾" 41'-2" Threaded Plug

MW2 36'' B 73" .284 .363 .359 .360 .363 3'-4" 2'-0" 49'-4" Manway

N7 - - - - - - - - - - 57'-7" AFFF

N8 8" B 19" .248 .485 .496 .483 .494 1'-5 ½" 1'-1 ½" 60'-11" Receipt

N9 - - - - TH TH TH TH - - 64'-11" Threaded Plug

N10 - - - - TH TH TH TH - - 64'-11" HLCV Float Pilot

N11 - - - - TH TH TH TH - - 64'-11" Threaded Plug

N12 - - - - TH TH TH TH - - 64'-11" HLCV Float Pilot

N13 2" - - - TH TH TH TH 5'-4" 5'-3" 73'-9" LLA

N14 2" - - - TH TH TH TH 3'-8" 3'-7" 74'-5" LLA

N15 2" - - - TH TH TH TH 1'-10" 1'-9" 78'-1" LLLA

N16 2" - - - TH TH TH TH 3'-4" 3'-3" 79'-0" LLLA

N17 8" B 19" .255 .499 .474 .477 .489 1'-10" 1'-5 ½" 87'-5" Main Suction

N18 3" B 11" .258 .303 .281 .304 .299 0'-10" 0'-8 ½" 89'-3" Low Suction

N19 3" - 11" .257 .292 .292 .306 .281 0'-9 ½ “ 0'-8" 91'-8" Water Draw-off

N20 3" B 9" Obstr. TH TH TH TH Fixed Roof IFR Anti-Rotation Cable

N21 3" B 9" Obstr. TH TH TH TH Fixed Roof IFR Grounding Cable

N22 8" B 18" .234 .320 .340 .311 .312 Fixed Roof Cameron ATG

N23 24" x 24" - - - .246 .245 .246 .244 Fixed Roof Inspection Hatch

N24 4" B 9" .381 Obstr Obstr Obstr Obstr Fixed Roof Scaffold Support

N25 24" - - - .181 .176 .183 .176 Fixed Roof Center Vent

N26 8" B 24" .251 .318 .332 .327 .335 Fixed Roof Manual Gauging Hatch

N27 24" x 24" - - - .219 .220 .220 .220 Fixed Roof Inspection Hatch

N28 4" B 9" .380 Obstr Obstr Obstr Obstr Fixed Roof Scaffold Support

N29 2" - - - TH TH TH TH Fixed Roof Varec TLG

N30 72" x 24" - - - .383 .381 .382 .382 Fixed Roof IFR Installation Hatch

N31 3" B 9" Obstr. TH TH TH TH Fixed Roof IFR Grounding Cable

N32 3" B 9" Obstr. TH TH TH TH Fixed Roof IFR Anti-Rotation Cable

Thickness measurements are in inches. Obstr.: Obstruction sue to inaccessibility or due to coating thickness

H1 = Centerline of pipe to edge of tank chime TH = Threaded

H2 = Edge of tank or chime to toe weld of reinforcement pad or nozzle Repad shapes:

TABLE 4 – SHELL DFT MEASUREMENTS

External Shell Coating Thickness

Average Standard Deviation Number of Readings Minimum Maximum

10.41 1.628 20 7.218 13.52

Roof Coating Thickness

Average Standard Deviation Number of Readings Minimum Maximum

10.74 1.223 15 8.027 12.55

Thicknesses are represented in mils.

TABLE 5 – SHELL SETTLEMENT MEASUREMENTS

Point Arc Length

(ft.)

Tank Chime (ft.)

1 0.00 1.510

2 12.17 1.583

3 24.35 1.563

4 36.52 1.563

5 48.69 1.563

6 60.87 1.510

7 73.04 1.542

8 85.22 1.625

Settlement points were measured clockwise from MW1.

The listed data should be used in future API inspections for comparison.

NEXT INSPECTION

The interval between tank inspections (both internal and external) should be determined by the tank service history.

Inspection intervals can be adjusted based on known corrosion rates. Corrosion rates can only be determined when a comparison is made between UTT measurements taken over an interval of time. In this case, corrosion rates were determined using thicknesses provided by the internal inspection report dated November 2016 and UTT measurements taken during this inspection. Listed below are recommended inspection intervals:

1. Routine In-service Inspection

Facility personnel shall perform a visual inspection of the tank exterior surfaces and associated piping. Gross defects, leaks, shell distortions, signs of settlement, and corrosion should all be monitored along with the foundation condition (including tank chime-to-foundation joint), coating, and appurtenances.

a. Interval: Monthly

2. External Visual Inspection

Formal visual external inspection shall be performed by an API certified inspector every five (5) years or RCA/4N years (where RCA is the difference between the measured shell thickness and the minimum required thickness and

N is the shell corrosion rate), whichever is less. Based on the review of shell thickness measurements, the 5-year interval will govern the next external visual inspection. This inspection includes inspection requirements listed in a routine in-service inspection as well as a visual inspection of the tank grounding system.

b. Interval: Five (5) years; March 2025

3. External Visual Inspection with Ultrasonic Thickness Testing

An API certified inspector with the assistance of an NDT examiner shall perform this inspection. UTT measurements shall be taken to verify thickness of the tank shell and associated components. Obtained UTT measurements are used to determine corrosion rates and remaining life of the tank shell. UTT measurements of shell plates can be performed with the tank in service and scheduled at a maximum interval of fifteen (15) years or RCA/2N, whichever is less.

Based on shell thickness measurements and corrosion rates, the recommended interval for this inspection is fifteen

(15) years.

c. Interval: Fifteen (15) years; March 2035

4. Internal Inspection

An API certified inspector with the assistance of an NDT examiner shall perform this inspection. This inspection consists of verifying that the tank bottom is not severely corroded and/or leaking, identifying and evaluation tank bottom settlement, and inspection requirements listed in both external visual inspections. The next out-of-service

API 653 inspection is based on recommendations from the previous in-service inspection report dated November

2016.

d. Interval: February 2031

API/OSHA ACCESS STRUCTURE REPORT

API/OSHA Stairway Data API Required OSHA Required

Handrail Actual (in) Min (in) Max (in) Min (in) Max (in) Pass/Fail

Height: 33 30 34 30 38 Pass

Width: 34 28 N/A 22 N/A Pass

APPENDIX B: API 653 CHECKLISTS FOR TANK INSPECTIONS

Tank In-Service Inspection Checklist

Item Completed

X

C.1.1 Foundation

Measure foundation levelness and bottom elevations (see Appendix A for extent of measurements). X

C.1.1.1 Concrete Ring a Inspect for broken concrete, spalling, and cracks, particularly under backup bars used in welding butt-welded annular rings under the shell.

X b Inspect drain openings in ring, back of water draw basins and top surface of ring for indications of bottom leakage.

X c Inspect for cavities under foundation and vegetation against bottom of tank. X d Check that runoff rainwater from the shell drains away from tank. X e Check for settlement around perimeter of tank. X

C.1.1.2 Asphalt X a Check for settling of tank into asphalt base which would direct runoff rain water under the tank instead of away from it.

N/A b Look for areas where leaching of oil has left rock filler exposed, which indicates hydrocarbon leakage. N/A

C.1.1.3 Oiled Dirt or Sand

Check for settlement into the base which would direct runoff rain water under the tank rather than away from it.

N/A

C.1.1.4 Rock a Presence of crushed rock under the steel bottom usually results in severe underside corrosion. Make a note to do additional bottom plate examination (ultrasonic, hammer testing, or turning of coupons) when the tank is out of service.

N/A

C.1.1.5 Site Drainage a Check site for drainage away from the tank and associated piping and manifolds. X b Check operating condition of the dike drains. X

C.1.1.6 Housekeeping

Inspect the area for buildup of trash, vegetation, and other inflammables buildup. X

C.1.1.7 Cathodic Protection a Review cathodic protection potential readings. X

C.1.2 Shells

C.1.2.1 External Visual Inspection a Visually inspect for paint failures, pitting, and corrosion. X b Clean off the bottom angle area and inspect for corrosion and thinning on plate and weld. X c Inspect the bottom-to-foundation seal, if any. X

C.1.2.2 Internal (Floating Roof Tank)

Visually inspect for grooving, corrosion, pitting, and coating failures. X

C.1.2.3 Riveted Shell Inspection a Inspect external surface for rivet and seam leaks. N/A b Locate leaks by sketch or photo (location will be lost when shell is abrasive cleaned for painting). N/A c

Inspect rivets for corrosion loss and wear.

N/A

Tank In-Service Inspection Checklist Continued

Item Completed

X d Inspect vertical seams to see if they have been full fillet lap-welded to increase joint efficiency. N/A e If no record exists of vertical riveted seams, dimension and sketch (or photograph) the rivet pattern:

number of rows, rivet size, pitch length, and note whether the joint is butt-riveted or lap-riveted.

N/A

C.1.2.4 Wind Girder (Floating Roof Tanks) a Inspect wind girder and handrail for corrosion damage (paint failure, pitting, corrosion product buildup), especially where it occurs at tack-welded junction, and for broken welds.

N/A b Check support welds to shell for pitting, especially on shell plates. N/A c Note whether supports have reinforcing pads welded to shell. N/A

C.1.3 Shell Appurtenances

C.1.3.1 Manways and Nozzles a Inspect for cracks or signs of leakage on weld joint at nozzles, manways, and reinforcing plates. X b Inspect for shell plate dimpling around nozzles, caused by excessive pipe deflection. X c Inspect for flange leaks and leaks around bolting. X d Inspect sealing of insulation around manways and nozzles.