ER-Report Tank 3.pdf

Inter Spec LLC Environmental Inspection Services 464 S Independence Blvd, C-104, Virginia Beach, VA 23452 www.interspecllc.net

Office: 757-622-6299 Fax: 757-622-9103

Toll Free: 800-546-7853

API-653 Engineering Inspection Report Tank # 3 (Facility #24223)

Prepared for

USCG; Elizabeth City, NC September 18, 2024

API Standard 653 recommends this document containing valuable historical information be retained for the life of the tank.

Signature(s):

Daniel Bailey, API-570 #62569, API-653 #56207, API-510 #74006

General Conditions

The information referenced in this engineering report is based solely upon the area or areas agreed upon and contracted for inspection on the date of the inspection and under those present, known, same, and current conditions. This report was prepared using retrievable data from those areas that were properly cleaned and prepared and made available and accessible during the inspection. Areas not contracted for inspection and areas that were not cleaned and made available and accessible are not included in this report.

The methods, standards and regulations used by InterSpec, LLC during the inspection and in preparing this engineering report comply with the most current and widely accepted standards and regulations in the industry, in which these standards and regulations make no representation, warranty or guarantee.

The professional opinions and recommendations stated in this report, including predictability of life, maximum length of time for re-inspection, suitability for product storage, and safe fill height are conclusive approximations and are intended to serve mainly as guidelines for obtaining the utmost in spill prevention and environmental protection. The listed recommendations may not necessarily be mandatory actions, but corrective actions that InterSpec, LLC suggests would better preserve the owners’/operators’ facility components and may contribute to a safer and more convenient operation.

Failure to comply with these could result in, but may not be limited to, reduction of service life, tank mishap, legal consequences and/or fines for owners/operators. It is best advised that the recommended repairs, corrective actions and procedures be fully and accurately complied with in order to meet the required and applicable federal, state and local regulations, and to have the necessary repairs and up-grades performed prior to making any change in service, product and/or current conditions. Some recommendations and requirements are necessary to bring the component(s) into compliance with federal, state, and local regulations. InterSpec, LLC recommends re-inspection after any corrective action, repair or change in usage when the change is to a more severe service. Any change in facility conditions that are applicable to this inspection report, such as, but not limited to, a change in service or usage could result in outdating this report. The predictability of any component in this report is a result of following the procedures in the applicable industry standard. InterSpec, LLC accepts absolutely no responsibility or liability for any mishap or failure, including any subsequent clean-up costs or legal ramifications, resulting from owners’/operators’ failure to perform the required repairs, inspections and re-inspections, as they apply.

Executive Summary

An API Standard 653 In-Service inspection of Tank # 3 (Facility #24222) was completed on September 18, 2024 to evaluate the tank’s integrity, collect data, and establish a database for future inspections and evaluations. Inspection Results are listed in section 4.1. Maintenance Recommendations are listed in section 4.2. Compliance Requirements are listed in section 4.3.

The tank does not meet the compliance requirements mandated by federal, state, and/or local regulatory bodies and requires that corrective action(s) be taken; however, the tank does meet requirements for structural integrity in accordance with the API-653 standard. The owner/operator may follow the schedule(s) in section 4.4. Refer to Compliance Requirements section 4.3 for details.

Table of Contents

1.0 Introduction

1.1 Purpose

2.0 References

2.1 Code of Federal Regulations (CFR)

2.2 American Petroleum Institute (API)

2.3 American Society of Mechanical Engineers Codes (ASME)

2.4 National Fire Protection Association (NFPA)

2.5 Underwriters Laboratories, Inc. (UL)

2.6 American Society of Nondestructive Testing (ASNT)

3.0 Description

3.1 Job Description

3.2 Tank Description

3.3 Service Description

3.4 Part Description

3.5 Joint Type Description

3.6 Inspection Description

3.7 Equipment Description

4.0 Inspection

4.1 Results

4.2 Maintenance Recommendations

4.3 Compliance Requirements

4.4 Serviceability

Appendices

A Engineering Calculations B Engineering Drawings C Engineering Data D API Checklist E Photographs

1.0 Introduction

1.1 Purpose:

1.1.1 This report presents an analysis of data collected during an inspection conducted on September 18, 2024 for Tank # 3 (Facility #24222), servicing JP-5, located at the USCG facility in Elizabeth City, NC. The inspection was performed by a certified API-653 inspector. This report summarizes the results of the inspection meeting the requirements of API Standard 653 and API-650. The primary and secondary containments including the supports, foundation, vents, gauges, and appurtenances were evaluated. The inspection was conducted by InterSpec, LLC.

2.0 References

2.1 Code of Federal Regulations (CFR):

United States Department of Labor, Occupational Safety & Heath Administration

2.1.1 CFR, Title 29, Subtitle B, Volume 5, Chapter XVII, Part 1910, Subpart H, Section 119, Process safety management of highly hazardous chemicals

2.1.2 CFR, Title 29, Subtitle B, Volume 5, Chapter XVII, Part 1910, Subpart J, Section 147, The control of hazardous energy (lockout/tagout)

2.1.3 CFR, Title 29, Subtitle B, Volume 5, Chapter XVII, Part 1910, Subpart S, Section 331-335, Safety-Related Work Practices

United States Environmental Protection Agency

2.1.4 CFR, Title 40, Volume 21, Chapter I, Subchapter D, Part 112, Oil Pollution Prevention

2.2 American Petroleum Institute (API):

2.2.1 API Standard 650, Welded Steel Tanks for Oil Storage

2.2.2 API Standard 653, Tank Inspection, Repair, Alteration, and Reconstruction

2.2.3 API RP 652, Lining of Aboveground Petroleum Storage Tank Bottoms

2.2.4 API RP 651, Cathodic Protection of Aboveground Petroleum Storage Tanks

2.2.5 API RP 575, Inspection of Atmospheric and Low-Pressure Storage Tanks

2.2.6 API RP 577, Welding Inspection and Metallurgy

2.2.7 API RP 2000, Venting Atmospheric and Low Pressure Storage Tanks

2.2.8 API Standard 570, Piping Inspection Code: Inspection, Repair, Alteration, and Rerating of In-

Service Piping Systems

2.2.9 API RP 571, Damage Mechanisms Affecting Fixed Equipment in the Refining Industry

2.3 American Society of Mechanical Engineers Codes (ASME):

2.3.1 ASME Boiler and Pressure Vessel Code; Section V, Non-Destructive Examination

2.3.2 ASME Boiler and Pressure Vessel Code; Section IX, Welding and Brazing Qualifications

2.4 National Fire Protection Association (NFPA):

2.4.1 NFPA-30, 2018 Ed., Flammable and Combustible Liquids Code

2.4.2 NFPA-70, 2017 Ed., National Electrical Code

2.4.3 NFPA-780, 2017 Ed., Standard for the Installation of Lightning Protection Systems

2.5 Underwriters Laboratories, Inc. (UL):

2.5.1 UL-142, Steel Aboveground Tanks for Flammable and Combustible Liquids

2.6 American Society of Nondestructive Testing (ASNT):

2.6.1 ASNT-SNT-TC-1A

3.0 Description

3.1 Job Description:

Job Number: 24-0518 Contracted by: US Coast Guard

3.2 Tank Description:

Owner/Operator: USCG Location: Elizabeth City, NC Tank Identification: 3 Diameter: 30.00 feet Shell Height: 18.00 feet Capacity: 80,000 Gallons Configuration: Vertical Foundation: Concrete Ringwall Secondary Containment: Concrete Dike Walls Year Installed: 1992 Age: 32 years Construction Code: API-650 Manufacturer: Unknown

3.3 Service Description:

Service: JP-5 Specific Gravity: 0.82 Operating Limits:

Minimum Metal Temperature: Ambient Maximum Metal Temperature: 150 ˚F Minimum Pressure: Atmospheric (no vacuum) Maximum Pressure: Product

Seismic Zone: 1 Max Fill Height: 15.13 feet

3.4 Part Description:

Bottom Material: Carbon Steel Specification: SA-285 Gr. C Design: Cone-Down

Shell Material: Carbon Steel Specification: SA-285 Gr. C Design: Cylindrical

Fixed Roof Material: Carbon Steel Specification: SA-285 Gr. C Design: Cone-Up

3.5 Joint Type Description:

Bottom Plate-to-Plate: Butt-Welded Shell Plate-to-Plate: Butt-Welded Roof Plate-to-Plate: Lap-Welded Bottom-to-Shell: Fillet-Welded Shell-to-Roof: Fillet-Welded

3.6 Inspection Description:

Inspection Type: API-653 In-Service Equipment Used: Ultrasonic Thickness Meter Inspection Date: September 18, 2024 Inspector(s): Daniel C. Bailey, Jihad Abu-Dharr

3.7 Equipment Description:

Ultrasonic Thickness Meter

Manufacturer: General Electric Model: DMS GO+ Calibration Methods Used: Zeroing Procedure, Copper Coating Calibration Procedure, and

Two Point Calibration Procedure

4.0 Inspection

4.1 Results:

4.1.1 Foundation: The tank sits on a concrete ringwall foundation. The foundation was visually evaluated during the inspection for broken concrete, spalling, cracks, and vegetation against the bottom of the tank. The tank is equipped with four leak detection ports equally spaced around the ringwall. Small amounts of vegetation are present around the foundation. Ground areas around tank storage facilities shall be kept free of weeds, trash, or other unnecessary combustible materials in accordance with NFPA 30 Section 4.5.7.2. The tank bottom-to-foundation seal has mostly deteriorated.

4.1.2 Containment: The tank sits on a concrete secondary containment floor with concrete dike walls. The size of the secondary containment is one-hundred eight feet by one-hundred eighteen and one-half feet; see Fuel Farm Containment 1 for details. The secondary containment is equipped with an 18-inch by 18-inch sump. The secondary containment is sloped to allow for drainage away from the tank as per the requirement of NPFA-30. The secondary containment is of sufficient size to contain a total tank loss. The secondary containment is structurally sound.

The secondary containment is in satisfactory condition. The secondary containment was visually evaluated during the inspection. The joint seals within the containment have approximately 550 linear feet of deteriorated sealant. A moderate amount of vegetation exists within the containment.

4.1.3 Shell: The shell is constructed of carbon steel material. The shell is a cylindrical design, butt-welded together, consisting of three courses. The shell was evaluated for plumbness, roundness, peaking, and banding, and all are within the allowable tolerances of API Standard

653. The exterior of the shell was visually inspected. The coating was inspected for disbonding, adhesion, deterioration; refer to the Painting/Insulation section for result details.

4.1.4 Fixed Roof: The fixed roof is constructed of carbon steel material. The roof is a cone-up design, lap-welded together, consisting of eight plates, fillet-welded to the shell. Evaluated the structural integrity of the roof. Evaluated the exterior coating for disbonding, adhesion, deterioration, and discoloration; refer to the Painting/Insulation section for result details.

Evaluated the roof nozzles. Inspected the vent. Inspected the gauge hatch cover and latch;

checked for proper seal integrity and cover operation. Evaluated the operation of the sampling system. See drawing for measurement and location details.

4.1.5 Floating Roof: The tank is equipped with a floating roof. The floating roof is constructed of aluminum material. The floating roof is a full contact (honeycomb flat design), butted together, screwed in place, consisting of twenty-six plates. The floating roof was visually evaluated during the inspection. Evaluated the double wiper seal and appurtenance seals, with no discrepancies.

4.1.6 Appurtenances: Each tank nozzle was inspected and evaluated in accordance with API Standard 650 and 653. The type and use of each shell nozzle were identified. All nozzles and reinforcement plates were evaluated for leaks and corrosion. The repads for the 6-inch issue and receipt line are not equipped with tell-tale holes. A close visual inspection of the nozzle reinforcement plate and shell did not reveal any stressed areas (indication of cracked weld, cracked coating, and capillary action effects of residues). In accordance with API Standard 650 Section 5.7.2.10 “Each reinforcing plate for shell openings shall be provided with a 6 mm (1/4 in.) diameter telltale hole. The hole shall be located on the horizontal centerline and shall be open to the atmosphere.”

The thermal relief valves on the product piping have a test sticker dated from 2017. TRVs should be tested annually to ensure proper operating conditions. The tank has means of ground via ground straps. Evaluated the Automatic Tank Gauge (ATG) and its operation. The high-level alarm system was inspected. The handrails, platforms, and frames were evaluated for corrosion and structural soundness; their conditions are satisfactory. The tank has means of emergency venting via a frangible roof design. The tank has means of normal venting via the 12-inch atmospheric vent.

The spiral stairway was inspected. The stairway treads have a rise of 9-inches. The spiral stairway has a clearance of 23-inches between the first step of the spiral stairway and the secondary containment floor. The stairs shall have uniform riser heights and tread depths between landings in accordance with OSHA 1910.25(b)(3).

There is no confined space warning sign at the shell manways. In accordance with OSHA Regulation 29 CFR 1910.146(c)(2), “If the workplace contains permit spaces, the employer shall inform exposed employees, by posting danger signs or by any other equally effective means, of the existence and location of and the danger posed by the permit spaces.

NOTE: A sign reading “DANGER -- PERMIT-REQUIRED CONFINED SPACE, DO NOT ENTER” or using other similar language would satisfy the requirement for a sign.”

4.1.7 Painting/Insulation: The tank shell, roof, stairway, handrails, and appurtenances are coated. There is minor coating failure on the tank’s fixed roof, roof nozzles, and tank bottom extension, predominantly by the flush deck cleanout. There is organic growth throughout the fixed roof, shell, and spiral stairway.

4.2 Maintenance Recommendations:

4.2.1 Foundation: Replace the sealant between the tank bottom and the concrete ringwall.

Sealing should be accomplished with a two-part corobond flexible joint sealant or equivalent.

(Quantity: 100%)

4.2.2 Containment: Replace the deteriorated joint seals in the secondary containment.

Sealing should be accomplished with a two-part corobond flexible joint sealant or equivalent.

(Quantity: Approximately 550 linear feet)

Remove any vegetation within the secondary containment.

4.2.3 Shell: None.

4.2.4 Fixed Roof: None.

4.2.5 Floating Roof: None.

4.2.6 Appurtenances: Ensure the thermal relief valves on the product piping are periodically tested to manufacturer’s recommendations. Consider reconfiguring the TRV lines to provide a test tee for testing the thermal relief valves without having to take apart the piping system.

4.2.7 Painting/Insulation: Mechanically clean the organic growth from the fixed roof, shell, and spiral stairway.

Mechanically clean and recoat any coating failure on the fixed roof, roof nozzles, and tank bottom extension. All coating repairs should be accomplished using an epoxy-based coating system or equivalent.

4.3 Compliance Requirements:

4.3.1 Foundation: None.

4.3.2 Containment: None.

4.3.3 Shell: None.

4.3.4 Fixed Roof: None.

4.3.5 Floating Roof: None.

4.3.6 Appurtenances: At the next out-of-service inspection, provide tell-tale holes on the reinforcement pads for the 6-inch issue and receipt nozzles in accordance with API Standard 650 Section 5.7.2.10. (Quantity: Two 6-inch shell nozzles)

Provide a concrete stair landing pad to minimize the first step height to the spiral stairway in accordance with OSHA.

Provide confined space warning signs at the tank manways.

4.3.7 Painting/Insulation: None.

4.4 Serviceability:

4.4.1 API-653 Schedule:

Tank # 3 (Facility #24222) is in compliance with the requirements of API Standard 653 for structural integrity; however, the tank does not meet the compliance requirements mandated by federal, state, and/or local regulatory bodies and requires that corrective action(s) be taken. The following schedule may be implemented:

4.4.1.1 Perform routine monthly visual inspections by owner/operator personnel that are knowledgeable of the storage facility operations, the tank, and the characteristics of the product stored; conduct in accordance with API Standard 653.

4.4.1.2 The next visual external inspection should be accomplished by a certified API-653 inspector prior to September 2029 in accordance with API-653.

4.4.1.3 The next ultrasonic thickness measurement inspection should be accomplished by a certified API-653 inspector prior to September 2039 in accordance with API-653.

4.4.1.4 Based on information gathered at the facility, the next internal inspection should be accomplished by a certified API-653 inspector prior to September 2029 in accordance with API- 653.

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 = 30 feet

G = 0.81

Y = 32 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 285-C 6 18.00 23,600 1.00 0.100 0.250 0.242 2 A 285-C 6 12.00 23,600 1.00 0.100 0.250 0.251 3 A 285-C 6 6.00 26,000 1.00 0.100 0.250 0.258

*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

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 0.00025 567 5 15 2 0.0002* 755 5 15 3 0.0002* 790 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

0.00030

1 2 3

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 0.242 0.1 2029 0.241 0.1 2034 0.240 0.1 2044 0.237 0.1 2054 0.235 0.1

*based on same service and corrosion rates.

Course #2:

Year Thickness tmin 2024 0.251 0.1 2029 0.250 0.1 2034 0.249 0.1 2044 0.247 0.1 2054 0.245 0.1

*based on same service and corrosion rates.

Current Thickness:

Current Thickness:

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

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 0.258 0.1 2029 0.257 0.1 2034 0.256 0.1 2044 0.254 0.1 2054 0.252 0.1

*based on same service and corrosion rates.

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 #3 Projected Thickness Graph

Thickness tmin

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 = 30 feet N = 8 L = 3.14(30)/8 = 11.781 feet Y = 30,000 psi E = 29,000,000 psi H = 18 feet

L 2 = 138.7913 square feet

11(138.7913)(30,000) 2(29,000,000)(18)

1) Maximum Permissible Out-of-Plane Deflection Calculation

S max = = 0.0439 feet

𝑆𝑚𝑎𝑥

11𝐿𝑌

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 0.03646 0.00000 0.03646 0.03112 0.02591 0.00794 0.00794 2 0.03125 0.00534 0.02591 0.03646 0.01823 -0.00143 0.00143 3 0.03646 0.01823 0.01823 0.02591 -0.01029 0.01042 0.01042 4 0.02083 0.03112 -0.01029 0.01823 -0.03125 -0.00378 0.00378 5 0.00521 0.03646 -0.03125 -0.01029 -0.03112 -0.01055 0.01055 6 0.00000 0.03112 -0.03112 -0.03125 0.00781 -0.01940 0.01940 7 0.02604 0.01823 0.00781 -0.03112 0.03112 0.00781 0.00781 8 0.03646 0.00534 0.03112 0.00781 0.03646 0.00898 0.00898

R 2 = 0.76 Note: Settlement evaluation must be done using the arc length method.

1) Out-of-Plane Deflection Calculation

Shell Settlement Graph

8 1

0.005

0.01

0.015

0.02

0.025

0.03

0.035

0.04

5 6 7 8 1 2 3 4 5

E le va ti on s

(f ee t)

Data PointsShell Settlement

Optimum Cosine Curve

Min. Settlement at (Pt 8)

Max. Settlement at (Pt 6)

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 Max Pt Sarc (ft) Si (in) Smax (in)

1 2 3 2 11.7810 0.0000 0.2133 Pass

2 3 1 6 70.6858 0.4375 1.2797 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

8 10.4375

0.25

0.5

1 2 3 4 5 6 7 8 1

E le va ti on s

(i nc he s)

Data Points

Appendix B

Engineering Drawings

1. Shell Layout Drawing

2. Roof Layout Drawing

Shell Layout [1 of 2] Tank # 3

USCG Base Support Unit (BSU); Elizabeth City, NC

InterSpec, LLC.

9/18/2024 N/A N/A

A - 30" Manway B - 1 1/2" Temperature Probe

Description:

Remarks/Legend:

Drawing Title:

Owner:

Drawn By:

Date: Rev. No.: Scale:

Modified By: InterSpec, LLC.

IN

T

E R

S P

E C

, L L

C -P

R O

P R

IE

TA

R Y

IN

F

O R

M A

T

IO

N -F

O R

O F

F

IC

IA

L

U S

E O

N

LY

A

Ground

Automatic Tank Gauge

1-1

2-1

3-1 3-2

2-2 2-3

1-2 1-3

Concrete Foundation

B

Leak Detection

Shell Layout [2 of 2] Tank # 3

InterSpec, LLC.

9/18/2024 N/A N/A

C - 30" Manway on 6'x5' Repad D - 1" Temperature Probe E - 2" low Suction F - 1" Thermal Relief Issue G - 1" Thermal Relief Receipt

H - 6" Issue on 12" Repad I - 6" Reciept on 12" Repad J - 24"x24" Cleanout

Description:

Remarks/Legend:

Drawing Title:

Owner:

Drawn By:

Date: Rev. No.: Scale:

Modified By: InterSpec, LLC.

IN

T

E R

S P

E C

, L L

C -P

R O

P R

IE

TA

R Y

IN

F

O R

M A

T

IO

N -F

O R

O F

F

IC

IA

L

U S

E O

N

LY

C

D

E

F G

H I J

30"x18" Shell Overflow Vent

1-4

2-4

3-3 3-4 3-5

2-5

1-5

Roof Layout [1 of 1] Tank # 3

InterSpec, LLC.

9/18/2024 N/A N/A

A -12" Atmospheric Vent B - 24" Access with Liquid Level Indicator C - 4" Gauge Hatch D - 4" Blank E - 3" Blank

F - 1 1/2" ATG with 1" Guide Wire G - 30" Access H - 2 1/2" Level Sensor

Description:

Remarks/Legend:

Drawing Title:

Owner:

Drawn By:

Date: Rev. No.: Scale:

Modified By: InterSpec, LLC.

IN

T

E R

S P

E C

, L L

C -P

R O

P R

IE

TA

R Y

IN

F

O R

M A

T

IO

N -F

O R

O F

F

IC

IA

L

U S

E O

N

LY

Standing Water

8"x24" Circulation Vent

8"x24" Circulation Vent

72"x24" Access Hatch

- Anti-Rotation Device

A

B

C

D

E

F

G

H

Appendix C

Engineering Data

1. First Shell Course Plate Thickness Measurements

2. Shell Drop Thickness Measurements

3. Shell Nozzle and Nozzle Reinforcement

4. Fixed Roof Plate Thickness Measurements

1 2 3 4 5 6 7 8 9

0.258 0.260 0.254 0.256 0.257 0.256 0.255 0.258 0.256

0.254 0.255 0.253 0.253 0.254 0.252 0.254 0.256 0.253

0.256 0.253 0.255 0.260 0.261 0.260 0.258 0.259 0.257

0.264 0.263 0.260 0.260 0.262 0.258 0.257 0.258 0.257

0.246 0.246 0.245 0.243 0.244 0.244 0.243 0.242 0.244

1 - 2

Thickness Measurements (inches) Point Numbers

Shell Plate Thickness Measurements

Plate # 1 - 1

1 - 3 1 - 4 1 - 5

1 4 7

25 5 8

3 6 9

Location # 1 is with 2" of Plate 1 - 1

1 0.258 51 0.258 2 0.257 52 0.258 3 0.257 53 0.257 4 0.257 54 0.258 5 0.255 55 0.256 6 0.256 56 0.259 7 0.255 57 0.259 8 0.253 58 0.258 9 0.254 59 0.257

10 0.254 60 0.257 11 0.253 61 0.259 12 0.254 62 0.260 13 0.254 63 0.257 14 0.255 64 0.256 15 0.254 65 0.258 16 0.256 66 0.258 17 0.256 67 0.261 18 0.249 68 0.260 19 0.255 69 0.257 20 0.257 70 0.255 21 0.252 71 0.261 22 0.253 72 0.259 23 0.252 73 0.251 24 0.252 74 0.243 25 0.253 75 0.245 26 0.252 76 0.245 27 0.252 77 0.242 28 0.252 78 0.244 29 0.251 79 0.245 30 0.251 80 0.246 31 0.251 81 0.245 32 0.251 82 0.244 33 0.253 83 0.244 34 0.251 84 0.245 35 0.252 85 0.244 36 0.253 86 0.251 37 0.252 87 0.257 38 0.255 88 0.257 39 0.255 89 0.258 40 0.255 90 0.256 41 0.256 91 0.256 42 0.256 92 0.256 43 0.256 93 0.255 44 0.257 94 0.255 45 0.257 46 0.258 47 0.258 48 0.258 49 0.259 50 0.258

Tank Shell 360 degree Measurement every 1 foot (within 12 inches of chime)

Location # Thickness in inches Location #

Thickness in inches

Shell Drop Thickness Measurements

Point No.

Course #1

Course #2

Course #3

1 0.246 0.253 0.258 2 0.247 0.252 0.260 3 0.248 0.254 0.260 4 0.248 0.254 0.260 5 0.246 0.254 0.261 6 0.247 0.254 0.261 7 0.248 0.254 0.261 8 0.247 0.253 0.263 9 0.246 0.253 0.261

10 0.246 0.251 0.259

NOTE: Thickness measurements are evenly spaced down each course along the path of each drop. The thickness measurements are in inches.

The lowest UT measurements are in RED, and the highest UT measurements are in GREEN for each shell course.

Shell Nozzle and Nozzle Reinforcement

Nom. 0o 90o 180o 270o

A 30" Manway 0.500 0.509 0.509 0.515 0.515 B 1-1/2" Temperature Sensor NA NA NA NA NA C 30" Manway 0.500 0.511 0.511 0.517 0.514 D 1-1/2" Temperature Probe NA NA NA NA NA E 2" Low Suction 0.154 0.155 0.134 0.126 0.154 F 1" Thermal Relief 0.179 0.128 0.155 0.129 0.139 G 1" Thermal Relief 0.179 0.132 0.125 0.130 0.130 H 6" Issue 0.280 0.265 0.267 0.271 0.275 I 6" Receipt 0.432 0.393 0.393 0.387 0.390 J 24x24" Clean-Out 0.500 0.241 0.244 NA 0.240

Nom. 0o 90o 180o 270o

A Diamond w/ Round Corner 0.250 0.281 0.281 0.279 0.274 C Diamond w/ Round Corner 0.250 0.253 0.257 0.256 0.254 E Circular 0.250 0.154 0.154 0.154 0.154 F Circular 0.250 0.257 0.256 0.256 0.257 G Circular 0.250 0.254 0.250 0.257 0.256 H Circular 0.250 0.256 0.255 0.255 0.256 I Circular 0.250 0.253 0.254 0.251 0.253 J Circular 0.250 0.251 0.251 NA 0.250

Shell Nozzle Reinforcement Measurements

Shell Nozzle Measurements Thickness Measurements (inches)Noz

Desig. Nozzle Description

Noz Desig. Reinforcement Description

Thickness Measurements (inches)

Fixed Roof Plate Thickness Measurements

1 2 3 4 5 1 0.199 0.195 0.198 A 2 0.191 0.174 0.189 B 3 0.197 0.196 0.196 0.197 0.196 E 4 0.198 0.201 0.199 0.199 0.201 E 5 0.198 0.198 0.196 0.197 0.201 E 6 0.195 0.194 0.194 0.194 0.193 E 7 0.191 0.191 0.190 C 8 0.197 0.196 0.194 D

NOTE: The lowest UT measurements are in RED, and the highest UT measurements are in GREEN.

Plate Number

Point No. Plate Type

Appendix D

API Standard 653 Checklists for Tank Inspections

1. Tank In-Service Inspection Checklist

Table C-1 Tank In-Service Inspection Checklist a X a X b X c X d X e X a NA b NA a NA a NA a X b X a X a NA a X b NA c X a NA a NA b NA c NA d NA e NA a NA b NA c NA

C.1.1 Foundation

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

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

Inspect drain openings in ring, back of waterdraw basins and top surface of ring for indications of bottom leakage.

Inspect for cavities under foundation and vegetation against bottom of tank.

Check that runoff rainwater from the shell drains away from the tank.

Check for settlement around perimeter of tank.

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

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

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.

C.1.1.4 Rock 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.

C.1.1.5 Site Drainage Check site for drainage away from the tank and associated piping and manifolds.

Check operating condition of dike drains.

C.1.1.6 Housekeeping Inspect the area for buildup of trash, vegetation, and other inflammables buildup.

C.1.1.7 Cathodic Protection Review cathodic protection potential readings.

C.1.2 Shells

C.1.2.1 External Visual Inspection Visually inspect for paint failures, pitting, and corrosion.

Clean off the bottom angle area and inspect for corrosion and thinning on plate and weld.

Inspect the bottom-to-foundation seal.

C.1.2.2 Internal (Floating Roof Tank) Visually inspect for grooving, corrosion, pitting, and coating failures.

C.1.2.3 Riveted Shell Inspection Inspect external surface for rivet and seam leaks.

Locate leaks by sketch or photo (location will be lost when shell is abrasively cleaned for painting).

Inspect rivets for corrosion loss and wear.

Inspect vertical seams to see if they have been full fillet lap welded to increase joint efficiency.

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.

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

Check support welds to shell for pitting, especially on shell plates.

Note whether supports have reinforcing pads welded to shell.

INTERSPEC, LLC-PROPRIETARY INFORMATION-FOR OFFICIAL USE ONLY

b X c X d NA e NA a X b X c NA d X e NA f NA g X h NA a NA b NA c X d NA e NA f X g X h NA i NA a NA b NA c NA a NA a NA b NA c NA a NA b NA c NA a NA

C.1.3 Shell Appurtenances

C.1.3.1 Manways and Nozzles Inspect for cracks or signs of leakage on weld joints at nozzles, manways, and reinforcing plates.

Inspect for shell plate dimpling around nozzles, caused by excessive pipe deflection.

Inspect for flange leaks and leaks around bolting.

Inspect sealing of insulation around manways and nozzles.

Check for inadequate manway flange and cover thickness on mixer manways.

C.1.3.2 Tank Piping Manifolds Inspect manifold piping, flanges, and valves for leaks.

Inspect fire fighting system components.

Check for anchored piping which would be hazardous to the tank shell or bottom connections during earth movement.

Check for adequate thermal pressure relief of piping to the tank.

Check operation of regulators for tanks with purge gas systems.

Check sample connections for leaks and for proper valve operation.

Check for damage and test the accuracy of temperature indicators.

Check welds on shell-mounted davit clips above valves 6 inches and larger.

C.1.3.3 Autogauge System Inspect autogauge tape guide and lower sheave housing (floating swings) for leaks.

Inspect autogauge head for damage.

Bump the checker on autogauge head for proper movement of tape.

Identify size and construction material of autogauge tape guide (floating roof tanks).

Ask operator if tape tends to hang up during tank roof movement (floating roof tanks).

Compare actual product level to the reading on the autogauge (maximum variation is 2 inches).

On floating roof tanks, when the roof is in the lowest position, check that no more than two feet of tape are exposed at the end of the tape guide.

Inspect condition of board and legibility of board-type autogauges.

Test freedom of movement of marker and float.

C.1.3.4 Shell-Mounted Sample Station Inspect sample lines for function of valves and plugging of lines, including drain or return-to-tank line.

Check circulation pump for leaks and operating problems.

Test bracing and supports of sample system lines and equipment.

C.1.3.5 Heater (Shell Manway Mounted) Inspect condensate drain for presence of oil indicating leakage.

C.1.3.6 Mixer Inspect for proper mounting flange and support.

Inspect for leakage.

Inspect condition of power lines and connections to mixer.

C.1.3.7 Swing Lines: Winch Operation Nonfloating. Raise, then lower the swing line with the winch, and check for cable tightness to confirm that swing line lowered properly.

Floating. With tank half full or more, lower the swing line, then let out cable and check if swing has pulled cable tight, indicating that the winch is operating properly.

Indicator. Check that the indicator moves in the proper direction: Floating swing line indicators show a lower level as cable is wound up on the winch. Non-floating swing line indicators show the opposite.

C.1.3.8 Swing Lines: External Guide System Check for leaks at threaded and flanged joints.

a NA a NA b NA a NA a NA a NA a X a X a NA a NA a NA b NA c NA a NA b NA

1 _______ _______ Opposite pair 1.

2 _______ _______ Opposite pair 2.

c NA d NA e NA f NA g NA h NA i NA j NA

C.1.3.9 Swing Lines: Identify Ballast Varying Need Check for significant difference in stock specific gravity.

C.1.3.10 Swing Lines: Cable Material and Condition For non-stainless steel cable, check for corrosion over entire length.

All cable: check for wear or fraying.

C.1.3.11 Swing Lines: Product Sample Comparison Check for water or gravity differences that would indicate a leaking swing joint.

C.1.3.12 Swing Lines: Target Target should indicate direction of swing opening (up or down) and height above bottom where suction will be lost with swing on bottom support.

C.1.4 Roofs

C.1.4.1 Deck Plate Internal Corrosion For safety, before accessing the roof, check with ultrasonic instrument or lightly use a ball peen hammer to test the deck plate near the edge of the roof for thinning. (Corrosion normally attacks the deck plate at the edge of a fixed roof and at the rafters in the center of the roof first.)

C.1.4.2 Deck Plate External Corrosion Visually inspect for paint failure, holes, pitting, and corrosion product on the roof deck.

C.1.4.3 Roof Deck Drainage Look for indication of standing water. (Significant sagging of fixed roof deck indicates potential rafter failure. Large standing water areas on a floating roof indicate inadequate drainage design or, if to one side, an unlevel roof with possible leaking pontoons).

C.1.4.4 Level of Floating Roof At several locations, measure distance from roof rim to a horizontal weld seam above the roof. A variance in the readings indicates a nonlevel roof with possible shell out-of-round, out-of-plumb, leaking pontoons or hangup. On small diameter tanks, an unlevel condition can indicate unequal loading at that level.

C.1.4.5 Gas Test Internal Floating Roof Test for explosive gas on top of the internal floating roof. Readings could indicate a leaking roof, leaking seal system or inadequate ventilation of the area above the internal floating roof.

C.1.4.6 Roof Insulation Visually inspect for cracks or leaks in the insulation weather coat where runoff rain water could penetrate the insulation.

Inspect for wet insulation under the weather coat.

Remove small test sections of insulation and check roof deck for corrosion and holes near the edge of the insulated area.

C.1.4.7 Floating Roof Seal Systems Inspect the condition of the seal, measure and record maximum rim spaces and seal-to-shell gaps around the full roof circumference at the level of inspection (Note: Inspection of the seal and measurement of the rim spaces and seal-to-shell gaps at more than one level may be necessary to more fully determine if any problems exist at other levels of tank operation)

Measure and record annular space at 30 foot spacing (minimum of 4 quadrants) around roof and record. Measurements should be taken in directly opposite pairs.

Check if seal fabric on primary shoe seals is pulling shoes away from shell (fabric not wide enough).

Inspect fabric for deterioration, holes, tears, and cracks.

Inspect visible metallic parts for corrosion and wear.

Inspect for openings in seals that would permit vapor emissions.

Inspect for protruding bolt or rivet heads against the shell.

Pull both primary and secondary seal systems back all around the shell to check their operation.

Inspect secondary seals for signs of buckling or indications that their angle with the shell is too shallow.

Inspect wedge-type wiper seals for flexibility, resilience, cracks and tears.

b X c NA d NA e NA f NA g NA h NA a NA b NA c NA d NA e NA a NA a NA b NA a NA b NA a NA b NA c NA a X a NA a NA a NA a NA a NA b NA

C.1.5 Roof Appurtenances

C.1.5.1 Sample Hatch Inspect condition and functioning of sample hatch cover.

On tanks governed by Air Quality Monitoring District rules, check for the condition of seal inside hatch cover.

Check for corrosion and plugging on thief and gauge hatch cover.

Where sample hatch is used to reel gauge stock level, check for marker and tab stating hold off distance.

Check for reinforcing pad where sample hatch pipe penetrates the roof deck.

On floating roof sample hatch and recoil systems, inspect operation of recoil reel and condition of rope.

Test operation of system.

On ultra clean stocks such as JP4, check for presence and condition of protective coating or liner inside sample hatch (preventing rust from pipe getting into sample).

C.1.5.2 Gauge Well Inspect visible portion of the gauge well for thinning, size of slots, and cover condition.

Check for a hold off distance marker and tab with hold off distance (legible).

On floating roofs, inspect condition of roof guide for gauge well, particularly the condition of the rollers for grooving.

If accessible, check the distance from the gauge well pipe to the tank shell at different levels.

If tank has a gauge well washer, check valve for leakage and for presence of a bull plug or blind flange.

C.1.5.3 Fixed Roof Scaffold Support Inspect scaffold support for corrosion, wear, and structural soundness.

C.1.5.4 Autogauge: Inspection Hatch and Guides (Fixed Roof) Check the hatch for corrosion and missing bolts.

Look for corrosion on the tape guide's and float guide's wire anchors.

C.1.5.5 Autogauge: Float Well Cover Inspect for corrosion.

Check tape cable for wear or fraying caused by rubbing on the cover.

C.1.5.6 Sample Hatch (Internal Floating Roof) Check overall conditions.

When equipped with a fabric seal, check for automatic sealing after sampling.

When equipped with a recoil reel opening device, check for proper operation.

C.1.5.7 Roof-Mounted Vents (Internal Floating Roof) Check condition of screens, locking and pivot pins.

C.1.5.8 Gauging Platform Drip Ring On fixed roof tanks with drip rings under the gauging platform or sampling area, inspect for plugged drain return to the tank.

C.1.5.9 Emergency Roof Drains Inspect vapor plugs for emergency drain: that seal fabric discs are slightly smaller than the pipe ID and that fabric seal is above the liquid level.

C.1.5.10 Removable Roof Leg Racks Check for leg racks on roof.

C.1.5.11 Vacuum Breakers Report size, number and type of vacuum breakers. Inspect vacuum breakers. If high legs are set, check for setting of mechanical vacuum breaker in high leg position.

C.1.5.12 Rim Vents Check condition of the screen on the rim vent cover.

Check for plating off or removal of rim vents where jurisdictional rules do not permit removal.

a NA b NA c NA a NA b NA c NA d NA e NA f NA a X b X c X d X e X a NA b NA c X d X a X b X c NA a NA b NA c NA d NA e NA f NA g NA h NA i NA j NA k NA l NA m NA

C.1.5.13 Pontoon Inspection Hatches Open pontoon inspection hatch covers and visually check inside for pontoon leakage.

Test for explosive gas (an indicator of vapor space leaks).

If pontoon hatches are equipped with locked down covers, check for vent tubes. Check that vent tubes are not plugged up. Inspect lock down devices for condition and operation.

C.1.6 Accessways

C.1.6.1 Handrails Identify and report type (steel pipe, galvanized pipe, square tube, angle) and size of handrails.

Inspect for pitting and holes, paint failure.

Inspect attachment welds.

Identify cold joints and sharp edges. Inspect the handrails and midrails.

Inspect safety drop bar (or safety chain) for corrosion, functioning and length.

Inspect the handrail between the rolling ladder and the gauging platform for a hazardous opening when the floating roof is at its lowest level.

C.1.6.2 Platform Frame Inspect frame for corrosion and paint failure.

Inspect the attachment of frame to supports and supports to tank for corrosion and weld failure.

Check reinforcing pads where supports are attached to shell or roof.

Inspect the surface that deck plate or grating rests on for thinning and holes.

Check that flat-surface to flat-surface junctures are seal welded.

C.1.6.3 Deck Plate and Grating Inspect deck plate for corrosion-caused thinning or holes (not drain holes) and paint failure.

Inspect plate-to-frame weld for rust scale buildup.

Inspect grating for corrosion-caused thinning of bars and failure of welds.

Check grating tie down clips. Where grating has been retrofitted to replace plate, measure the rise of the step below and above the grating surface and compare with other risers on the stairway.

C.1.6.4 Stairway Stringers Inspect spiral stairway stringers for corrosion, paint failure and weld failure. Inspect attachment of stairway treads to stringer.

Inspect stairway supports to shell welds and reinforcing pads.

Inspect steel support attachment to concrete base for corrosion.

C.1.6.5 Rolling Ladder Inspect rolling ladder stringers for corrosion.

Identify and inspect ladder fixed rungs (square bar, round bar, angles) for weld attachment to stringers and corrosion, particularly where angle rungs are welded to stringers.

Check for wear and corrosion where rolling ladder attaches to gauging platform.

If rolling ladder track extends to within five feet of the edge of the roof on the far side, check for a handrail on the top of the shell on that side.

Inspect pivot bar for wear and secureness.

Inspect operation of self-leveling stairway treads.

Inspect for corrosion and wear on moving parts.

Inspect rolling ladder wheels for freedom of movement, flat spots and wear on axle.

Inspect alignment of rolling ladder with roof rack.

Inspect top surface of rolling ladder track for wear by wheels to assure at least 18 inches of unworn track (track long enough).

Inspect rolling ladder track welds for corrosion.

Inspect track supports on roof for reinforcing pads seal welded to deck plate.

Check by dimensioning, the maximum angle of the rolling ladder when the roof is on low legs. Maximum angle. __________

Appendix E

Photographs

E1: Overall View of Tank

E2: Containment

E3: Containment

E4: Containment

E5: Grounding

E6: Failed Foundation Sealant

E7: Manway

E8: Leak Detection

E9: Repair Data Plate

E10: Foundation

E11: Tape Gauge

E12: Failed Joint Sealant

E13: Base of Stairway

E14: Stairway

E15: First Step Rise

E16: Temperature Probe

E17: Product Piping

E18: Low Suction

E19: Receipt/Issue Piping

E20: Receipt/Issue no Telltale

E21: Thermal Relief Piping

E22: Minor Coating Failure on Nozzles

E23: TRV 2017 Test Date

E24: Clean-Out

E25: Coating Failure on Bottom Extension

E26: Mildew on Shell

E27: Overall View of Roof

E28: Overall View of Roof

E29: Overall View of Roof

E30: Tape Gauge Piping

E31: Gauge Hatch

E32: Access and Level Sensor

E33: Perimeter Vent

E34: Organic Growth on Roof

E35: Center Vent

E36: Center Vent Screen

E37: Roof Access

E38: Overflow Vent