Attachment J - Tank 3040 Inspection Report.pdf

US Army Corps of Engineers Omaha District

API 653 In‐Service Inspection Report

Warfield ANG, MD Tank 2 (Facility 3040)

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

(USACE POL‐MCX)

3/27/2024

Table of Contents

ACRONYMS AND ABBREVIATIONS

GENERAL SUMMARY

STATE REGULATIONS

PREVIOUS INSPECTION DATES

RECOMMENDED FUTURE INSPECTION DATES

A. GENERAL PROJECT INFORMATION

1. API 653 Inspection

2. Site Information

B. TANK INSPECTION COMMENTS

1. Tank Construction

2. Secondary Containment

3. Tank Foundation

4. Tank Bottom

5. Tank Shell

6. Tank Floating Roof

7. Tank Fixed Roof

8. Tank Appurtenances

9. Tank Piping System

10. Fire Protection System

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 ..................................................................................... A‐1

APPENDIX B: ENGINEERING DRAWINGS ............................................................................................ B‐1

APPENDIX C: ENGINEERING DATA ..................................................................................................... C‐1

APPENDIX D: API 653 CHECKLISTS FOR TANK INSPECTIONS ............................................................. D‐1

APPENDIX E: PHOTOGRAPHS………………………………………………………………………………………………………….E‐1

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 In‐Service inspection was conducted on Tank 2 (Facility 3040) at Warfield ANG, MD.

The tank was constructed in 1985 and has undergone repairs and upgrades completed in 2015 that include (2) 8‐inch aluminum stilling wells, (1) 4‐inch stilling well, and other miscellaneous repairs. The inspection was completed on March 27, 2024. The overall service life of the tank is estimated to be greater than 20 years.

Significant Findings (overview)

Mandatory None

Required Repairs

1. The weld spacing is inadequate between the reinforcement of the 30‐inch manway and the shell‐to‐bottom weld. The weld spacing is 2.25 inches. The weld spacing should be at least three inches.

2. The expansion joint seals on the containment floor are deteriorated, which may prevent containment of product as required by 40 CFR 112.

3. Minor vegetation growth is present on the containment floor, which may prevent containment of product as required by 40 CFR 112

4. The ringwall to secondary containment floor seal has approximately 70 linear feet of deteriorated sealant.

5. The joint sealant between the tank bottom and the foundation has cracked, deteriorated, and lost seal from the concrete, which may prevent containment of product as required by 40 CFR 112.

6. The secondary containment wall expansion joints are not sealed at the top of the containment wall and have deteriorated sealant. This allows water to enter the void between the wall sections and potentially corrode the rebar.

7. There is a hairline crack in the concrete pipe support pier of the second support from the tank on the issue line and a hairline crack in the pier of the second support from the tank on the receipt line.

8. The secondary containment’s pipe penetration seals are deteriorated on the 2.5‐inch AFFF line.

9. The circumferential stairway is 28‐inches wide. The stairway has a clear width of 17‐inches at the IFR manway and a clear width of 20‐inches at the AFFF line. The minimum clear width is 26‐ inches in accordance with OSHA.

10. The roof circulation vent/ inspection hatches are not equipped with a safety chain at the mid‐ rail between the perimeter guardrail posts. Both of the circulation vent/ inspection hatches have a bolted mid‐rail blocking the hatch from opening.

11. Six of the stairway tread handrail supports are welded directly on the tank shell are on the tank weld seams. This does not meet good engineering practice and current API standard.

Recommended Repairs

1. The tank center roof vent lacks a reinforcement plate per AW 78‐24‐27 Drawing D.09 Detail 2.

2. The 30‐inch manway cover in the first shell course and the floating roof manway cover on the second shell course have only one 5/8‐inch handle not two and are hinged in lieu of davit arms per AW 78‐24‐27 Drawing D.10 Detail 3. The flush deck cleanout has no handles, hinges, or davit arms.

3. The AFFF piping and foam chamber have coating failure and are painted white. The color red is designated for fire protection systems in accordance with MIL‐STD‐161G.

4. The coating on the tank shell, nozzles, chime, AFFF piping, roof handrails, and fixed roof is deteriorated and faded, with some coating holidays.

5. The tank does not have the facility number marked on the tank.

6. The tank is not equipped with an isolation valve on the upstream side of the diaphragm control valve as recommended in AW 78‐24‐27. An isolation valve on the upstream side of the automatic valve helps when conducting maintenance on the diaphragm control valve instead of having to drain the entire fuel line.

7. The tank is equipped with a 3‐inch low point drain with an anti‐freeze valve instead of a DBB valve. The anti‐freeze valve is connected to a plugged cam‐lock fitting. The low point drain is approximately 20ft from the issue line and does not tie into the issue line as recommended in

AW 78‐24‐27.

8. The product saver tank is not equipped with a ground strap.

9. The tank is equipped with one 30‐inch shell manway and a 24‐inch x 24‐inch flush deck clean out approximately 180° from the shell manway. UFC 3‐460‐01 recommends two 36‐inch manholes 180° apart.

10. The tank is equipped with 4 grounding cables equally spaced around the tank. However, the ground cables are bolted to the chime instead of the grounding lugs being attached to the shell in accordance with API‐650 Section 5.8.11.3 and Figure 2.23.

11. The Varec MTG display is faded, and the supports are welded directly to the shell. The facility uses the ENRAF electronic readout for tank levels.

12. The center vent is not configured to the criteria described in AW 78‐24‐27. The vent is equipped with a 24‐inch flanged nozzle that reduces to a 12‐inch vent. The screened vent opening is 7‐ inches in length.

13. The tank is equipped with two roof circulation vents/ inspection hatches. UFC 3‐460‐01 recommends four circulation vents/ inspection hatches equally spaced around the fixed roof.

14. The shell‐mounted thermometer reads 80 degrees F, while the outdoor temperature is 45 degrees F, and the Enraf display on the fixed roof reads 45.30 degrees F.

15. The tank is not equipped with a bolted cover in the roof for installation and removal of the internal floating pan as recommended in UFC 3‐460‐01. However, there is a 30‐inch upper shell manway to access the top of the IFR.

16. The tank is not equipped with two scaffold cable supports located near the center of the tank as recommended in accordance with UFC 3‐460‐01.

17. The tank does not have a cathodic protection system for the bottom.

18. The tank does not have a bottom leak detection system.

19. The Enraf ATG and independent level alarms have different set point heights. Typically, the independent level alarm set points are referenced off of the shell height, and the electronic ATG is referenced off the stilling well’s datum plate.

20. The 6 tank shell supports for the mechanical tape gauge including 2 unistruts for the roof lighting hardware and 5 unistruts for the Enraf conduit lack reinforcement pads per AW 78‐24‐ 27 Drawing D.07 Detail 1.

21. The 3 tank shell attachments for the AFFF line lack reinforcement pads per AW 78‐24‐27 Drawing D.07 Detail 1.

22. The 10‐inch issue line has a slip‐on flange at the DBB valve. Slip‐on flanges are not permitted on new systems per UFC 3‐460‐01 9‐8 (a). Existing systems may use slip‐on flanges only when unable to use conventional weld‐neck flanges.

Inspection Date: March 27, 2024

Inspection(s) Performed: API‐653 In‐Service

Inspector(s): Kevin T. Grant

STATE REGULATIONS

API‐653 In‐Service Tank Inspections: N/A

API‐653 Out‐of‐Service Tank Inspections: N/A

NOTE: If there are no state regulations for tank inspections, N/A shall reside in‐place of the number of years between inspections. If state regulations reside, the recommended future inspections dates shall be based on whichever is more stringent between the API inspector’s calculations and the state regulations.

PREVIOUS INSPECTION DATES

API Out‐of‐Service (Internal) Inspection Date: April 2014

API In‐Service (External) Inspection Date: Unknown

RECOMMENDED FUTURE INSPECTION DATES

API Out‐of‐Service (Internal) Inspection Date: April 2034

API In‐Service (External) Inspection Date: March 2029

Signature(s):

Kevin T. Grant, API‐653 # 36109 InterSpec, LLC.

GENERAL TANK INFORMATION

ITEM DESCRIPTION

Owner Air National Guard

Location Warfield ANG

Facility Number 3040

Tank Number 2

State / Country Maryland, United States

City Middle River

Inspection Date March 27, 2024

Tank Manufacturer Witherup Fabrication & Erection/ Erected by Summit City Construction

Design Standard API Standard 650 7th Edition

Date of Construction 1985

Tank Contents Jet Fuel (F‐24)

Tank Serial Number NA

Tank Diameter 31’ 0”

Shell Height 42’ 3”

Product Height 7’ 8”‐ 10/16

Tank Capacity 5,000 Barrels (210,000 Gallons)

Foundation Concrete Ringwall

Construction

Bottom Lap‐Welded

Shell Butt‐Welded (Cylindrical)

Floating Roof Bolted and Sealed

Fixed Roof Lap‐Welded

Material

Bottom Carbon Steel

Shell Carbon Steel, A‐36

Floating Roof Aluminum

Fixed Roof Carbon Steel

Cathodic Protection None

Interior Coating System Thin Film Epoxy/Polyurethane

Exterior Coating System Thin Film Epoxy/Polyurethane

Level Gauging ENRAF ATG

Overfill Protection Hydraulically Operated Control Valve

Piping

Receipt 6" Stainless Steel

Issue 10" Stainless Steel

Low Suction 3" Carbon Steel with Stainless Steel Flange

Water Draw‐Off 2" to 1"

2" Carbon Steel Flange to 1" Stainless Steel

Level Alarms & Controls

Description ENRAF ATG Independent

High‐High Level Alarm: 35’ 04‐10/16" 36’ 09‐00/16"

High‐Level Alarm: 31’ 07‐15/16" 35’ 03‐00/16"

Low‐Level Alarm: 5’ 07‐01/16" 4’ 09‐00/16"

Low‐Low Level Alarm: 1’ 10‐06/16" 3’ 09‐00/16"

High‐Level Control Shut‐off: 36’ 00‐00/16"

Type of Internal Floating Roof

Aluminum Skin Pan with Pontoons

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 In‐

Service inspection was performed for Tank 2 (Facility 3040).

2. Site Information

On March 27, 2024, InterSpec, LLC performed an API 653 In‐Service inspection of Tank 2

(Facility 3040), located at the Warfield ANG Base in Middle River, MD.

B. TANK INSPECTION COMMENTS

1. Tank Construction

Tank 2 is a nominal 210,000 gallon (5,000 barrel), 31’ 0” diameter by 42’ 3” tall, F‐24 Jet fuel, aboveground vertical storage tank. The tank was constructed in 1985 and has undergone repairs and upgrades in 2015 by CAPE Environmental, Inc. that included (2) 8‐inch aluminum stilling wells, (1) 4‐inch stilling well, and other miscellaneous repairs as displayed by a nameplate.

2. Secondary Containment

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. The secondary containment area consists of concrete floor and concrete vertical walls. An informal containment evaluation was conducted. The containment appears to be of sufficient size to contain a total tank loss per UFC 3‐460‐01 Section 8‐14.2.1, “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 secondary containment area appears to be properly graded to drain water away from the tank in accordance with NFPA 30.

3. Tank Foundation

The tank rests on a concrete ringwall. The original construction of the tank foundation consists of a liner and oil sand. The tank does not have a cathodic protection system. The tank does not have a bottom leak detection system. The tank is equipped with eight anchor bolts equally spaced around the tank. The ringwall is coated, and a limited visual evaluation was conducted during the inspection for broken concrete, spalling, cracks, and vegetation against the bottom of the tank. Site personnel noted the surrounding area has a high water table, and water seeps into the containment from underneath the tank bottom. The tank bottom‐to‐ringwall sealant was inspected. A soft pliable blue sealant has been applied between the tank bottom and the ringwall.

4. Tank Bottom

The bottom was not evaluated.

5. Tank Shell

The shell is constructed of A‐36 carbon steel material. The shell is a cylindrical design, butt‐ welded together, consisting of six (6) courses. The shell exterior has a thin film epoxy coating system. The coating was inspected for disbonding, adhesion, deterioration, and discoloration; it is in unsatisfactory condition. The tank appears to be stable and does not appear to be in danger of overturning or buckling due to high winds or seismic conditions.

6. Tank Floating Roof

The tank is equipped with an internal floating roof. The floating roof is an aluminum skin pan with pontoon type design.

7. Tank Fixed Roof

The fixed roof is a self‐supported cone roof constructed of A‐36 carbon steel material. The fixed roof is lap‐welded together consisting of 14 plates fillet‐welded to the shell. The roof has areas of standing water causing minor coating failure. The fixed roof has an epoxy coating system on the exterior. The coating was inspected for disbonding, adhesion, deterioration, and discoloration; it is in unsatisfactory condition.

8. Tank Appurtenances

Note: The following table is an overview of the appurtenance status regarding UFC‐3‐460‐01 and AW 78‐24‐78 standards and does not reflect API standards, federal regulations, state regulations, and/or local regulations.

Overview of Appurtenance

Item Appurtenance

Installed Fully or Partially

Meets Current Design

Standards

A. Manhole

1. 36‐inch manhole located above the IFR high leg position. ☒ ☐

2. At least two (2) fixed roof manholes. ☒ ☐

3. At least two (2) 36‐inch shell manholes. ☐ ☐

4. A bolted cover in the fixed roof for installation of IFR. ☐ ☐

B. Inspection Hatches

1. At least of four (4) 24‐inch square inspection hatches on fixed roof with IFR (min. spacing 32 feet).

C. Ladder/Stairs

1. Internal ladders with internal floating roofs. ☐ ☐

2. Access to high level shut‐off and alarms. ☒ ☒

D. Level Alarms An individual automatic level alarm system, independent of the gauging device or system. Include high, high‐high, low and low‐low level alarms. On aboveground tanks: provide a means to manually test each alarm sensor to ensure system operability without a full tank; locate level alarm equipment for ready access from ground level, stairway platforms, or roof access.

1. High‐High Level Alarm ☒ ☒

2. High Level Alarm ☒ ☒

3. Low Level Alarm ☒ ☒

4. Low‐Low Level Alarm ☒ ☒

E. Vents

1. Open atmospheric vents with weather hoods and bird screens. ☒ ☐

2. Emergency relief venting (a floating roof or frangible joint may be used to fulfill emergency relief requirements).

F. Gauge/Gauge Hatch/Stilling Wells

1. A mechanical liquid level gauge. ☒ ☒

2. Automatic Tank Gauging (ATG) (ENRAF fuel level & VITO water level systems).

3. One 10‐inch roof flanged nozzle with an 8‐inch aluminum, fully slotted, stilling well for ATG near the edge of the roof near the top of the stairway platform for fuel level ATG.

4. One 8‐inch roof flanged nozzle with a 6‐inch aluminum, fully slotted, stilling well for temperature and water bottom sensor, as close to or in the tank sump as possible for water level ATG.

5. One 10‐inch roof nozzle and an aluminum, slotted stilling well for gauging and sampling.

G. Piping Connection

1. Receipt Line ☒ ☐

Overview of Appurtenance

Item Appurtenance

Installed Fully or Partially

Meets Current Design

Standards

2. Low Suction Line ☒ ☐

3. Issue Line. ☒ ☒

H. Overfill Protection

1. Overfill protection with a hydraulically operated diaphragm control valve.

I. Water Draw‐Off

1. Water draw‐off system. ☒ ☒

J. Ball Joints

1. Ball joints on pipes to relieve strain caused by tank settling or seismic activity or other means.

K. Cable Supports

1. On the fixed roof of all tanks, provide two scaffold cable supports ☐ ☐

a. Water Draw‐Off System

1) Water Draw‐Off Line: The water draw‐off piping consists of 1‐inch stainless steel piping. The line has a 2‐inch double‐block and bleed valve at the shell.

2) Product Saver Tank: The product saver tank (PST) is constructed of stainless steel.

The PST is equipped with a gooseneck vent but is not grounded.

b. Low Suction System

The tank is equipped with a 3‐inch low suction/low point drain. The 3‐inch nozzle has an anti‐freeze valve and is not tied into the issue line.

c. Issue Line

The 10‐inch issue line is stainless steel. The line is protected from overpressure with a thermal relief system. The thermal relief system consists of 1‐inch welded stainless steel piping and fittings.

d. Receipt Line

The 6‐inch receipt line is stainless steel. The line is protected from overpressure with a thermal relief system. The thermal relief system consists of 1‐inch welded stainless steel piping and fittings.

e. Automatic Tank Gauging (Fuel Level)

The tank is equipped with an ENRAF system for electronic fuel level gauging. The system is installed in an 8‐inch slotted aluminum stilling well.

f. Automatic Tank Gauging (Water Level)

The tank is equipped with an ENRAF VITO system for electronic water level gauging.

The system is installed in a 4‐inch slotted aluminum stilling well. This stilling well is located near the sump.

g. Mechanical Tank Gauging

The tank is equipped with a VAREC mechanical tape level gauge for mechanical fuel level gauging. The system is in functional condition, but the display is faded.

h. Tank Sampling\Manual Gauging

The tank is equipped with an 8‐inch aluminum slotted stilling well for sampling and manual gauging.

i. Level Alarms\High Level Shut‐Off

The ENRAF system provides low, low‐low, high, and high‐high level alarms. The tank is equipped with independent low, low‐low, high, and high‐high level alarms.

The high level alarm assembly and high level shut‐off assembly are accessible from the circumferential stairway. The piping consists of 1‐inch welded stainless steel piping.

j. Ladder and Platforms

The tank’s fixed roof is accessible by a circumferential stairway mounted on the shell of the tank. The circumferential stairway has platforms for the upper manhole and at the fixed roof. The floating roof is accessible by the upper shell manhole located on the circumferential stairway.

k. Grounding

The tank has four (4) grounding straps equally spaced around the circumference of the tank chime.

l. Anchoring

The tank has eight (8) anchor chairs equally spaced around the circumference of the tank.

9. Tank Piping System

Fuel is received and issued by trucks.

10. Fire Protection System

The fire department provides fire protection. The tank is equipped with a 2.5‐inch AFFF line, and two fire hydrants are near the tank along the accessway.

C. FINDINGS AND RECOMMENDATIONS

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

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.

None

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

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. These items may be required by federal, state and local codes, or by military criteria.

a. Manway Reinforcement Plate Weld Spacing

OBSERVATION: The weld spacing is inadequate between the reinforcement of the 30‐inch manway and the shell‐to‐bottom weld. The weld spacing is 2.25 inches. The weld spacing should be at least three inches.

CODE REFERENCE: API‐650 Figure 5.6 and Section 5.7.3

RECOMMENDATION: Magnetic particle (MT) examination must be performed on the affected welds of the manway and the shell‐to‐bottom weld. Note: MT examination will be required on all future inspections unless modified. Modify the reinforcement pad of the manway in accordance with API‐653 Section 9.7 to meet the minimum weld spacing at the next Clean Inspect Repair (CIR) project. (Quantity: 1)

b. Containment Floor Expansion Joint Seals Deteriorated

OBSERVATION: The expansion joint seals on the containment floor are deteriorated, which may prevent containment of product as required by 40 CFR 112.

CODE REFERENCE: 40 CFR Sections 112.8(c)(2) and 112.12(c)(2), and UFGS 32 01 19.61

RECOMMENDATION: Remove the deteriorated expansion joint sealant and apply new sealant in accordance with UFGS 32 01 19.61. (Quantity: 30 LF).

c. Vegetation in Containment

OBSERVATION: Minor vegetation growth is present on the containment floor, which may prevent containment of product as required by 40 CFR 112.

CODE REFERENCE: 40 CFR 112.7(c), 40 CFR 112.8(c)(2), 40 CFR 112.12(c)(2), 40 CFR 112.1(b)

RECOMMENDATION: Remove the vegetation growth from the containment and seal the cracks or expansion joint. (Quantity: 4 SF)

d. Foundation to Secondary Containment Sealant

OBSERVATION: The ringwall to secondary containment floor seal has approximately 70 linear feet of deteriorated sealant.

CODE REFERENCE: 40 CFR 112.1(B), 40 CFR 112.8(C)(2), 40 CFR 112.12(C)(2), and

UFC 3‐460‐01 Section 8‐14.2.1.

RECOMMENDATION: Replace the deteriorated expansion joints between the ringwall and secondary containment floor in accordance with UFGS 32 01 19.61.

(Quantity: approximately 70 linear feet)

e. Foundation to Bottom Sealant

OBSERVATION: The joint sealant between the tank bottom and the foundation has cracked, deteriorated, and lost seal from the concrete, which may prevent containment of product as required by 40 CFR 112.

CODE REFERENCE: 40 CFR Sections 112.8(c)(2) and 112.12(c)(2), and UFGS 32 01 19.61.

RECOMMENDATION: Replace the sealant between the bottom of the tank and the foundation. (Quantity: approximately 10 LF)

f. Expansion Joints in the Secondary Containment Walls

OBSERVATION: The secondary containment wall expansion joints are not sealed at the top of the containment wall and have deteriorated sealant. This allows water to enter the void between the wall sections and potentially corrode the rebar.

CODE REFERENCE: 40 CFR 112.1(B), 40 CFR 112.8(C)(2), 40 CFR 112.12(C)(2), and

UFC 3‐460‐01 Section 8‐14.2.1.

RECOMMENDATION: Replace the deteriorated expansion joints in the secondary containment walls in accordance with UFGS 32 01 19.61. (Quantity: 40 LF)

g. Hairline Cracks in Concrete Pipe Support Piers

OBSERVATION: There is a hairline crack in the concrete pipe support pier of the second support from the tank on the issue line and a hairline crack in the pier of the second support from the tank on the receipt line.

CODE REFERENCE: UFGS 03 30 00.

RECOMMENDATION: Repair all hairline cracks in the concrete pipe support piers per UFGS 03 30 00. (Quantity: Approximately 1 LF)

h. Secondary Containment Pipe Penetration Seals

OBSERVATION: The secondary containment’s pipe penetration seals are deteriorated on the 2.5‐inch AFFF line.

CODE REFERENCE: 40 CFR 112.1(B), 40 CFR 112.8(C)(2), 40 CFR 112.12(C)(2), and

UFC 3‐460‐01 Section 8‐14.2.1.

RECOMMENDATION: Replace the deteriorated sealant around the pipe penetrations.

Consider configuring the concrete wall penetrations in accordance with AW 78‐24‐27 Drawing CD.08. (Quantity: 1 pipe penetration)

i. Circumferential Stairway Clearance

OBSERVATION: The circumferential stairway is 28‐inches wide. The stairway has a clear width of 17‐inches at the IFR manway and a clear width of 20‐inches at the AFFF line. The minimum clear width is 26‐inches in accordance with OSHA.

CODE REFERENCE: OSHA 29 CFR 1910.25(d)(1)

RECOMMENDATION: Provide widened stairs/platform at the location of the upper shell manway and the AFFF line to provide adequate clearance between the tank appurtenances and the spiral stairway handrail in accordance with OSHA. (Quantity: 1 circumferential stairway handrail)

j. Perimeter Guard Rail on Fixed Roof

OBSERVATION: The roof circulation vents/ inspection hatches are not equipped with a safety chain at the mid‐rail between the perimeter guardrail posts. Both of the circulation vents/ inspection hatches have a bolted mid‐rail blocking the hatch from opening.

CODE REFERENCE: OSHA 29 CFR 1910.29 Figure D‐11, AW 78‐24‐27 Drawing D.09

RECOMMENDATION: Install a galvanized chain between the perimeter guard rail posts at vents as a removeable, intermediate rail with one end welded to post and one end hooked to the other post to satisfy OSHA and current applicable standards. (Quantity: 2 mid‐rail chains)

k. Shell Attachment and Spacing (Circumferential Stairway Tread Supports) Not per

Code

OBSERVATION: Six of the stairway tread handrail supports are welded directly on the tank shell and are on the tank weld seams. This does not meet good engineering practice and current API standard.

CODE REFERENCE: API 650 Section 5.8.1.2 “Permanent attachments may be welded directly to the shell with fillet welds having a maximum leg dimension of 13 mm (1/2 in.). The edge of any permanent attachment welds shall be at least 75 mm (3 in.) from the horizontal joints of the shell and at least 150 mm (6 in.) from the vertical joints, insert‐plate joints, or reinforcing‐plate fillet welds.”

RECOMMENDATION: The tank has demonstrated a history of service without failure at the welds, but routine Magnetic Particle Inspection should be included as part of the inspection program until future upgrades are made (particularly after seismic events or after any abnormal tank condition). The stairway treads can be mounted to a reinforcement pad that is seal‐welded to the shell meeting the spacing requirement of API Std. 653. (Quantity: 6)

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. Fixed Roof Center Vent without Reinforcement

OBSERVATION: The tank center roof vent lacks a reinforcement plate per AW 78‐24‐27

Drawing D.09 Detail 2.

CODE REFERENCE: AW 78‐24‐27 Drawing D.09 Detail 2.

RECOMMENDATION: Add a reinforcement plate per AW 78‐24‐27 Drawing D.09 Detail 2.

(Quantity: 1)

b. Shell Manway Handles and Hinges

OBSERVATION: The 30‐inch manway cover in the first shell course and the floating roof manway cover on the second shell course have only one 5/8‐inch handle not two and are hinged in lieu of davit arms per AW 78‐24‐27 Drawing D.10 Detail 3. The flush deck cleanout has no handles, hinges, or davit arms.

CODE REFERENCE: AW 78‐24‐27 Drawing D.10 Detail 3

RECOMMENDATION: Replace the first shell course manway cover and second shell course floating roof manway cover with those with two handles and davit arms per AW 78‐24‐27 Drawing D.10 Detail 3. (Quantity: 2)

c. Improper Color for AFFF Line

OBSERVATION: The AFFF piping and foam chamber have coating failure and are painted white. The color red is designated for fire protection systems in accordance with MIL‐STD‐

161G.

CODE REFERENCE: MIL‐STD‐161G and UFGS 09 97.13.27

RECOMMENDATION: Mechanically clean and recoat the AFFF pipping and foam chamber in accordance with UFGS 09 97.13.27. Ensure all coloring and banding meets the criteria described in MIL‐STD‐161G and UFGS 09 97.13.27. (Quantity: approximately 75 SF)

d. Coating Failure on Tank Shell, Nozzles, Chime, AFFF Piping, Roof Handrails, and Fixed

Roof

OBSERVATION: The coating on the tank shell, nozzles, chime, AFFF piping, roof handrails, and fixed roof is deteriorated and faded, with some coating holidays.

CODE REFERENCE: UFC 3‐460‐03 Section 8‐3.1 and UFGS 09 97.13.27

RECOMMENDATION: Mechanically clean and recoat the tank shell, nozzles, chime, AFFF piping, roof handrails, and fixed roof in accordance with UFGS 09 97.13.27 (Exterior Coating of Steel Structures). (Quantity: approximately 5,500 square feet)

e. Tank Markings

OBSERVATION: The tank does not have the facility number marked on the tank.

CODE REFERENCE: UFC 3‐460‐01 Section 2‐17(b), MIL‐STD‐161

RECOMMENDATION: Replace the existing banding with easily discernible painted numbers and letters indicating the Tank number, Facility number, “No Smoking” on Class 1 tanks, and “Confined Space” on the Roof Manhole/Ladder Hatch in addition to the requirements stated in MIL‐STD‐161. (Quantity: 2 sets of labels)

f. Product Receipt Line

OBSERVATION: The tank is not equipped with an isolation valve on the upstream side of the diaphragm control valve as recommended in AW 78‐24‐27. An isolation valve on the upstream side of the automatic valve helps when conducting maintenance on the diaphragm control valve instead of having to drain the entire fuel line.

CODE REFERENCE: AW 78‐24‐27 Drawing D.12 Detail 3

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, consider installing an isolation valve on the upstream side of the diaphragm control valve as recommended in AW 78‐24‐27. (Quantity: 1 isolation valve)

g. Low Suction Line

OBSERVATION: The tank is equipped with a 3‐inch low point drain with an anti‐freeze valve instead of a DBB valve. The anti‐freeze valve is connected to a plugged cam‐lock fitting.

The low point drain is approximately 20ft from the issue line and does not tie into the issue line as recommended in AW 78‐24‐27.

CODE REFERENCE: UFC 3‐460‐01 Table 8‐1(z), AW 78‐24‐27 Drawing G.05

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, install a new low suction line that meets the criteria of

UFC3‐460‐01 and AW 78‐24‐27. (Quantity: 1 low suction line)

h. Product Saver Tank

OBSERVATION: The product saver tank is not equipped with a ground strap.

CODE REFERENCE: AW 78‐24‐27 Drawing D.13 Detail 5

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, install a ground strap on the product saver tank in accordance with AW 78‐24‐27. (Quantity: 1 ground strap)

i. Second Manhole

OBSERVATION: The tank is equipped with one 30‐inch shell manway and a 24‐inch x 24‐inch flush deck clean out approximately 180° from the shell manway. UFC 3‐460‐01 recommends two 36‐inch manholes 180° apart.

CODE REFERENCE: UFC 3‐460‐01 Table 8‐1(f) and AW 78‐24‐27 Drawing D.10 Detail 3

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, provide two 36‐inch shell manholes with manhole covers supported by davits in accordance with AW Standard 78‐24‐27 Drawing D.10

Detail 3. (Quantity: two 36‐inch manholes)

NOTE: Although UFC 3‐460‐01 recommends 36‐inch manholes, the risk of damaging the tank must be taken into account. See UFC 3‐460‐01 Section 12‐3.2 for further detail when considering an increase in manhole sizes.

j. Tank Grounding

OBSERVATION: The tank is equipped with 4 grounding cables equally spaced around the tank. However, the ground cables are bolted to the chime instead of grounding lugs attached to the shell in accordance with API‐650 Section 5.8.11.3 and Figure 2.23.

CODE REFERENCE: UFC 3‐460‐01 Table 8‐1(q) and AW Standard 78‐24‐27 Drawing

D.07 Detail 1.

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, provide four grounding lugs that meet the criteria described in AW 78‐24‐27 Drawing ED.02 Details 1 and 2. (Quantity: 4 grounding lugs)

k. Mechanical Tape Gauge

OBSERVATION: The Varec MTG display is faded, and the supports are welded directly to the shell. The facility uses the ENRAF electronic readout for tank levels.

CODE REFERENCE: UFC 3‐460‐01 Table 8‐1(q) and AW Standard 78‐24‐27 Drawing

D.07 Detail 1.

RECOMMENDATION: If system upgrades are deemed appropriate for this tank system, have the Varec mechanical tape gauge serviced in accordance with manufacturer’s recommendations and meet the design criteria described in AW 78‐24‐27 Drawing

D.07 Detail 1. IF the MTG is no longer being used by the facility, consider removing the mechanical tape gauge. (Quantity: 1 Varec MTG display)

l. Roof Center Vent

OBSERVATION: The center vent is not configured to the criteria described in AW 78‐24‐27.

The vent is equipped with a 24‐inch flanged nozzle that reduces to a 12‐inch vent. The screened vent opening is 7‐inches in length.

CODE REFERENCE: AW 78‐24‐27 Drawing D.09 Detail 2

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, install a center vent that meets the criteria described in

AW 78‐24‐27 Drawing D.09 Detail 2. (Quantity: 1)

m. Roof Circulation Vents / Inspection Hatches

OBSERVATION: The tank is equipped with two roof circulation vents/ inspection hatches.

UFC 3‐460‐01 recommends four circulation vents/ inspection hatches equally spaced around the fixed roof.

CODE REFERENCE: UFC 3‐460‐01 Table 8‐1(h), AW 78‐24‐27 Drawing D.09 Detail 2

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, provide four roof circulation vents/inspection hatches that meet the criteria described in AW 78‐24‐27 Drawing D.09 Detail 2. (Quantity: 4)

n. Shell‐Mounted Thermometer

OBSERVATION: The shell‐mounted thermometer reads 80 degrees F, while the outdoor temperature is 45 degrees F, and the Enraf display on the fixed roof reads 45.30 degrees

F.

CODE REFERENCE: Good engineering practice

RECOMMENDATION: Calibrate or replace the shell‐mounted thermometer. (Quantity: 1)

o. Pan Installation Hatch

OBSERVATION: The tank is not equipped with a bolted cover in the roof for installation and removal of the internal floating pan as recommended in UFC 3‐460‐01. However, there is a 30‐inch upper shell manway to access the top of the IFR.

CODE REFERENCE: UFC 3‐460‐01 Table 8‐1(g), AW 78‐24‐27 Drawing D.08 Detail 2

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, install a pan installation hatch on the fixed roof in accordance with the pan manufacturer’s requirements. (Quantity: 1 internal floating roof pan hatch)

p. No Scaffold Cable Supports

OBSERVATION: The tank is not equipped with two scaffold cable supports located near the center of the tank as recommended in accordance with UFC 3‐460‐01.

CODE REFERENCE: API‐650 Figure 5.22 and UFC 3‐460‐01 Table 8‐1(jj)

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, install two scaffold cable supports in accordance with

API‐650 Figure 5.22 (Quantity: 2)

q. Cathodic Protection System

OBSERVATION: The tank does not have a cathodic protection system for the bottom.

CODE REFERENCE: UFC 3‐460‐01 Sections 12‐8 and AW 78‐24‐27 Drawings ED.01 ‐ ED.04

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, install a cathodic protection system that meets the criteria described in UFC 3‐460‐01 and AW 78‐24‐27. (Quantity: 1 cathodic protection system)

r. Bottom Leak Detection

OBSERVATION: The tank does not have a bottom leak detection system.

CODE REFERENCE: UFC 3‐460‐01 Sections 12‐7

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, install a bottom leak detection system that meets the criteria described in UFC 3‐460‐01 and AW 78‐24‐27. (Quantity: 4 leak detection ports)

s. Liquid Level Alarm Set Points

OBSERVATION: The Enraf ATG and independent level alarms have different set point heights. Typically, the independent level alarm set points are referenced off of the shell height, and the electronic ATG is referenced off the stilling well’s datum plate.

CODE REFERENCE: Good Engineering Practice

RECOMMENDATION: Consider having the Enraf ATG system and shell mounted independent level alarms calibrated and adjusted to match and have the same reference heights in accordance with manufacturer’s recommendations and current applicable standards. (Quantity: 2 systems)

t. Shell Attachments at the MTG Do Not Have Reinforcement Pads

OBSERVATION: The 6 tank shell supports for the mechanical tape gauge including 2 unistruts for the roof lighting hardware and 5 unistruts for the Enraf conduit lack reinforcement pads per AW 78‐24‐27 Drawing D.07 Detail 1.

CODE REFERENCE: AW 78‐24‐27 Drawing D.07 Detail 1

RECOMMENDATION: Provide shell reinforcement plates for the 6 mechanical tape gauge supports, 2 roof lighting hardware unistruts, and 5 unistruts for the Enraf conduit.

(Quantity: 13 total shell attachment support repads)

u. Shell Attachments for the AFFF Line

OBSERVATION: The 3 tank shell attachments for the AFFF line lack reinforcement pads per

AW 78‐24‐27 Drawing D.07 Detail 1.

CODE REFERENCE: AW 78‐24‐27 Drawing D.07 Detail 1

RECOMMENDATION: Provide shell reinforcement plates for the 3 shell attachments on the AFFF line or remove the AFFF if not in use. (Quantity: 3 total shell attachment support repads)

v. Slip On Flange on Issue Line OBSERVATION: The 10‐inch issue line has a slip‐on flange at the DBB valve. Slip‐on flanges are not permitted on new systems per UFC 3‐460‐01 9‐8 (a). Existing systems may use slip‐ on flanges only when unable to use conventional weld‐neck flanges.

CODE REFERENCE: UFC 3‐460‐01 9‐8 (a)

RECOMMENDATION: Replace the slip‐on flange on the issue line with a weld‐neck flange.

(Quantity: 1)

Appendix A

Engineering Calculations

1. Shell Service Life Evaluation

2. Shell Settlement Evaluation

Shell Service Life Evaluation

Where:

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).

Y = 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:

tmin =

2.6(H−1)DG

SE

Lr = tact − tmin

Cr Cr = tprev − tact Y Iut = tact − tmin 2Cr

Iv = tact − tmin

4Cr

1) Minimum Required Thickness

D = 31 feet

G = 0.84

Y = 39 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 A 36 8.00 37.42 24,900 1.00 0.100 0.250 0.252 2 A 36 7.00 29.42 24,900 1.00 0.100 0.250 0.249 3 A 36 7.00 22.42 27,400 1.00 0.100 0.250 0.248 4 A 36 7.00 15.42 27,400 1.00 0.100 0.250 0.252 5 A 36 7.00 8.42 27,400 1.00 0.100 0.250 0.249 6 A 36 6.13 1.42 27,400 1.00 0.100 0.250 0.250

*The t prev values were based on t nom .

0.000

0.050

0.100

0.150

0.200

0.250

0.300

1 2 3 4 5 6

In ch es

Course

Thickness Graph tprev tact tmin

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 0.0002* 760 5 15 2 0.00003 5810 5 15 3 0.00005 2886 5 15 4 0.0002* 760 5 15 5 0.00003 5810 5 15 6 0.0002* 750 5 15

* Let C r =0.0002 inches per year for calculation purposes.

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 2024 0.252 0.1 2029 0.251 0.1 2034 0.250 0.1 2044 0.248 0.1 2054 0.246 0.1

*based on same service and corrosion rates.

Course #2:

Year Thickness tmin 2024 0.249 0.1 2029 0.249 0.1 2034 0.249 0.1 2044 0.248 0.1 2054 0.248 0.1

*based on same service and corrosion rates.

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

Current Thickness:

Current 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

2024 2026 2028 2030 2032 2034 2036 2038 2040 2042 2044 2046 2048 2050 2052 2054

In ch es

Year

Course #1 Projected Thickness Graph

Thickness tmin

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2024 2026 2028 2030 2032 2034 2036 2038 2040 2042 2044 2046 2048 2050 2052 2054

In ch es

Year

Course #2 Projected Thickness Graph

Thickness tmin

Course #3:

Year Thickness tmin 2024 0.248 0.1 2029 0.248 0.1 2034 0.247 0.1 2044 0.247 0.1 2054 0.246 0.1

*based on same service and corrosion rates.

Course #4:

Year Thickness tmin 2024 0.252 0.1 2029 0.251 0.1 2034 0.250 0.1 2044 0.248 0.1 2054 0.246 0.1

*based on same service and corrosion rates.

Course #5:

Year Thickness tmin 2024 0.249 0.1 2029 0.249 0.1 2034 0.249 0.1 2044 0.248 0.1 2054 0.248 0.1

Anticipated Thickness (20 yrs)* Anticipated Thickness (30 yrs)*

Anticipated Thickness (20 yrs)* Anticipated Thickness (30 yrs)*

Anticipated Thickness (30 yrs)*

Current Thickness:

Anticipated Thickness (5 yrs)* Anticipated Thickness (10 yrs)* Anticipated Thickness (20 yrs)*

Current Thickness:

Anticipated Thickness (5 yrs)* Anticipated Thickness (10 yrs)*

Current Thickness:

Anticipated Thickness (5 yrs)* Anticipated Thickness (10 yrs)*

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2024 2026 2028 2030 2032 2034 2036 2038 2040 2042 2044 2046 2048 2050 2052 2054

In ch es

Year

Course #3 Projected Thickness Graph

Thickness tmin

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2024 2026 2028 2030 2032 2034 2036 2038 2040 2042 2044 2046 2048 2050 2052 2054

In ch es

Year

Course #4 Projected Thickness Graph

*based on same service and corrosion rates.

Course #6:

Year Thickness tmin 2024 0.250 0.1 2029 0.249 0.1 2034 0.248 0.1 2044 0.246 0.1 2054 0.244 0.1

*based on same service and corrosion rates.

Anticipated Thickness (20 yrs)* Anticipated Thickness (30 yrs)*

Current Thickness:

Anticipated Thickness (5 yrs)* Anticipated Thickness (10 yrs)*

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2024 2026 2028 2030 2032 2034 2036 2038 2040 2042 2044 2046 2048 2050 2052 2054

In ch es

Year

Course #6 Projected Thickness Graph

Thickness tmin

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2024 2026 2028 2030 2032 2034 2036 2038 2040 2042 2044 2046 2048 2050 2052 2054

In ch es

Year

Course #5 Projected Thickness Graph

Shell Settlement Evaluation

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 = 31 feet N = 8 L = 3.14(31)/8 = 12.1737 feet Y = 30,000 psi E = 29,000,000 psi H = 42.25 feet

L 2 = 148.1983 square feet

11(148.1983)(30,000) 2(29,000,000)(42.25)

1) Maximum Permissible Out-of-Plane Deflection Calculation

S max = = 0.02 feet

𝑆𝑚𝑎𝑥 11𝐿 𝑌

2𝐸𝐻

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

|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 0.07292 0.00000 0.07292 -0.01373 0.08002 0.08002 0.03977 2 0.09375 0.01373 0.08002 0.07292 0.00521 0.00521 0.04096 3 0.05208 0.04688 0.00521 0.08002 -0.03835 -0.03835 0.01563 4 0.04167 0.08002 -0.03835 0.00521 -0.04167 -0.04167 0.02012 5 0.05208 0.09375 -0.04167 -0.03835 -0.02794 -0.02794 0.00852 6 0.05208 0.08002 -0.02794 -0.04167 -0.02604 -0.02604 0.00592 7 0.02083 0.04688 -0.02604 -0.02794 -0.01373 -0.01373 0.00521 8 0.00000 0.01373 -0.01373 -0.02604 0.07292 0.07292 0.03717

R 2 = 0.2 Note: Settlement evaluation must be done using the arc length method.

1) Out-of-Plane Deflection Calculation

Shell Settlement Graph

5 6

0.005

0.01

0.015

0.02

0.025

0.03

0.035

0.04

0.045

0.05

0.055

0.06

0.065

0.07

0.075

0.08

0.085

0.09

0.095

0.1

6 7 8 1 2 3 4 5 6

E le va ti on s

(f ee t)

Data PointsShell Settlement

Optimum Cosine Curve

Min. Settlement at (Pt 1)

Max. Settlement at (Pt 4)

S arc = settlement arc length between start and end point, in feet.

S i = maximum out-of-plane settlement within the settlement arc length, in inches.

K = factor based on tank roof type (per B.3.2.2).

Roof Typ Fixed Roof

K = 10.5

Sarc # Start Pt End Pt End Pt Sarc (ft) Si (in) Smax (in)

1 2 4 3 24.3473 0.1875 0.1940 Pass

2 4 7 4 36.5210 0.0000 0.2911 Pass

Evaluation of the settlement by the arc length method is within acceptable limits.

API 653 B.2.2.5 Evaluation by Settlement Arc Length Method (For R 2 less than 0.9)

Si < Smax →

Si < Smax →

Arc Length Evaluation

𝑆 𝑚𝑖𝑛 𝑘 𝑆 𝐷 𝐻

𝑌 𝐸 , 4.0

5 6

0.25

0.5

0.75

1.25

2 3 4 5 6 7 8 1 2

E le va ti on s

(i nc he s)

Data Points

Appendix B

Engineering Drawings

1. Shell Layout

2. Fixed Roof Layout

3. Containment Layout

Remarks/Legend:

Owner/Operator:

Inspection Firm:

Date: Revision Number: Revision Date:

Drawing Title: Tank Description: Drawing Number:

Warfield ANG; Middle River, MD

InterSpec, LLC.

03/27/2024 N/A N/A

Tank 2 (Fac. 3040) S-1Shell Layout

Seam #1 is the first seam left of the first manway left of the stairway in the first shell course viewing from the outside.

The number in the upper left corner of each plate identifies the plate by the course and position of the plate in that course.

Tank has a diameter of 31', and a shell height of 42' 3".

A - 3" Low Suction B - 10" Product Issue C - 3/4" Plug D - 30" Manway E - 30" Upper Shell F - 2" to 1" Water Draw G - 1" Low Low Level Alarm H - 1" Low Level Alarm

I - 2 1/2" AFFF

J - 24" Flush Deck Cleanout K - 1" High Level Alarm L - 1" High High Level Alarm M - 6" Receipt N - 1 1/4" Temperature Probe

A C

D

E

B F

I

J M

N

Shell Overflow

Anchor Bolt Ground

Tape Gauge

G

H

K

L

Inspection Firm:

Date: Revision Number: Revision Date:

Drawing Title: Tank Description: Drawing Number:

Warfield ANG; Middle River, MD

InterSpec, LLC.

03/27/2024 N/A N/A

Tank 2 (Fac. 3040) R-1Roof Layout

Tank has a diameter of 31', and a shell height of 42' 3".

A - 8" ENRAF

B - 24" x 24" Roof Hatch C - 24" Mushroom Vent D - 1 1/2" Anti-Rotation Anchor E - 1 1/2"…