Attachment J.1 - Tank 3036 Inspection Report.pdf

US Army Corps of Engineers Omaha District

API 653 In‐Service Inspection Report

Joint Base Andrews, Camp Springs, MD.

Tank 10 (Facility 3036)

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

(USACE POL‐MCX)

6/06/2023

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: EGINEEERING DATA………………………………………………………….........................................B‐1

APPENDIX C: ENGINEERING DRAWINGS……………………………………………………………………………………… 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 10 (Facility 3036) at Joint Base Andrews in Camp Springs, MD. The tank was originally constructed in 1960. The inspection was completed on June 06, 2023. The overall service life of the tank is estimated to be greater than 20 years.

Significant Findings (overview)

Mandatory None

Required Repairs

1. The secondary containment has hairline and minor cracking, which may prevent containment of product as required by 40 CFR 112.

2. The conduit penetrations into the containment floor, are not in accordance with the standard design, which may prevent containment of product as required by 40 CFR 112.

3. The secondary containment drain is not in accordance with the tank standard design. It is buried in the ground with just the stem showing. It has no post with indicator, and the valve appears to be a gate valve, which may prevent containment of product as required by 40 CFR 112.

4. The ENRAF VITO water and temperature probe face plate is not attached to the unit; electrical wires and components are exposed.

5. The concrete ringwall has exposed hairline cracks, which may prevent containment of product as required by 40 CFR 112 and API Standard 653 C.1.1.1 (a).

6. The exterior pipe supports, located in the secondary containment, for both the 10” issue and 6” receipt lines. have coating failure and associated corrosion present.

7. The circumferential stairway has coating failure on the stairway treads, handrails, and stringers.

Note: The stairway treads are constructed from diamond plate which can cause a slipping hazard during inclement weather.

8. The 2” DBB valves for the water draw off system, product return line, and 4” low suction nozzle have coating failure and associated corrosion present.

9. The 10” issue line located inside of the containment has areas of chipped paint and associated corrosion present.

Recommended Repairs

1. The tank does not have any anchoring. Typically, tank anchoring is only required when determined by wind, seismic, and internal pressure evaluations. Tank anchoring also prevents tanks from floating and causing additional damage when the secondary containment sufficiently fills with liquid (water or fuel), and the tank does not have sufficient product. Tanks floating off their foundations has occurred at a few military installations.

2. The 4‐inch low suction line lacks a crossover connection to the issue line with means of thermal relief per AW 78‐24‐27 Drawings G.05 and D.10 Detail 4. Note: the 4‐inch low suction nozzle is located approximately seventy feet to the left of the 10‐inch issue line.

3. The 36‐inch first shell course manway cover supports do not conform to AW 78‐24‐27 Drawing D.10 Detail 3. Typically, davits are mounted to the manhole flange as recommended in AW 78‐ 24‐27. The current covers are supported by hinges.

4. The telltale hole on the reinforcement plate for the low suction line is open with minor corrosion in lieu of being packed with white grease to prevent insect nesting and buildup of debris per UFC 3‐460‐03 Section 8‐9.13.4.1.

5. The relief piping for the 10‐inch tank issue line is 1” in diameter and is constructed from a mixture of welded and flanged carbon and stainless‐steel piping (not entirely of stainless steel).

6. The relief piping for the 6‐inch tank receipt line is 1” in diameter and is constructed from a mixture of welded and flanged carbon and stainless‐steel piping (not entirely stainless steel).

7. The tank 10‐inch issue line located inside of the berm lacks a fuel sample connection in accordance with the current standard design. Note: A fuel sample connection exists on the 6‐ inch receipt line.

8. The tank is equipped with four (4) ground cables attached to the shell. The ground cables lack 3‐ by 3‐ by 1/4‐inch‐thick stainless steel grounding lugs with 1/2‐inch radius corners and 6‐inch Ø carbon steel reinforcing plates. The cables are also bolted and not exothermically welded.

9. The tank is not equipped with a manway located above the IFR on high leg position as shown in AW 78‐24‐27 and UFC 3‐460‐01.

10. The shell supports of the Shand & Jurs mechanical tape level gauge (MTG) do not have reinforcement plates on the shell per AW 78‐24‐27 Drawing D.07 Detail 1.

11. The tank stairway is not equipped with a copper grounding bar brazed to the handrail or a grounding lug with #4 bare copper wire connected to the tank grounding system.

12. The circumferential stairway treads are welded directly to the shell. The stairway configuration is not constructed as shown in AW 78‐24‐27 as a free‐standing stairway.

13. The tank has a carbon steel double deck IFR with shoe type seals and not an aluminum honeycomb style IFR with double wiper seal as required by UFGS.

14. The tank has a steel corrugated shed type roof installed and does not have a sloped fixed roof.

Inspection Date: June 06, 2023

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

Inspector(s): Richard M. Bailey

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: June 2014

API In‐Service (External) Inspection Date: October 2017

RECOMMENDED FUTURE INSPECTION DATES

API Out‐of‐Service (Internal) Inspection Date: June 2024 (based on previous report)

API In‐Service (External) Inspection Date: June 2028

Note: In accordance with UFC 3‐460‐03, the Out‐of‐Service inspection interval is every 10 years or as recommended by an appropriately certified tank inspector in the previous API 653 or STI SP001 inspection report.

Signature(s):

Richard M. Bailey, API‐653 # 30241 InterSpec, LLC.

GENERAL TANK INFORMATION

ITEM DESCRIPTION

Owner United States Air Force

Location JB Andrews, Camp Springs, MD.

Facility Number 3036

Tank Number 10

State / Country Maryland, United States

City Camp Springs

Inspection Date June 06, 2023

Tank Manufacturer Unknown

Design Standard API Standard 12C

Date of Construction 1960 Original

Tank Contents Jet‐A (F‐24)

Tank Serial Number Not Available

Tank Diameter 42’ 6”

Shell Height 38’ 10”

Product Height 35’ 11”

Tank Capacity 10,000 BBLS. (Nominal) 9,800 BBLS (Gross) Foundation Concrete Ringwall

Construction

Bottom Lap‐Welded

Shell Butt‐Welded 6‐courses

Floating Roof Lap‐Welded

Fixed Roof Corrugated Shed Type (Bolted)

Material

Bottom Carbon Steel Unknown Grade

Shell Carbon Steel Unknown Grade

Floating Roof Carbon Steel Unknown Grade

Fixed Roof Corrugated Sheet Metal

Cathodic Protection Yes (Impressed Current)

Interior Coating System Unknown

Exterior Coating System Urethane Coated Epoxy

Level Gauging MTG and ENRAF ATG

Overfill Protection Hydraulically operated control valve

Piping

Receipt 6" Coated Carbon Steel

Issue 10" Coated Carbon Steel

Low Suction 4" Coated Carbon Steel

Water Draw‐Off 2" 2" Carbon Steel Flange to 1" Stainless Steel

Level Alarms & Controls

Description ENRAF ATG Independent

High‐High Level Alarm: 36 0‐8/16” 36 0‐8/16”

High‐Level Alarm: 35’ 0‐0/16” 35’ 0‐0/16”

Low‐Level Alarm: 2’ 10‐8/16” 2’ 10‐8/16”

Low‐Low Level Alarm: 1’ 4‐0/16” 1’ 4‐0/16”

High‐Level Control Shut‐off: 36’ 11‐0/16”

Type of Internal Floating Roof

Carbon Steel Double Decker

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 10 (Facility 3036).

2. Site Information

On June 06, 2023, InterSpec, LLC performed an API 653 In‐Service inspection of Tank 10

(Facility 3036), located at Joint Base Andrews, Camp Springs, MD.

B. TANK INSPECTION COMMENTS

1. Tank Construction

Tank 10 is a nominal 10,000 BBLS. (500,000 gal.), 42’ 6” diameter by 38’ 10” tall, F‐24 Jet‐A, aboveground field erected vertical storage tank. The tank was constructed in 1960. The tank was constructed to API‐12C standards.

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 an uncoated concrete floor and concrete sloped walls. The containment is equipped with a 36” X 24” sump located in the northwest corner. 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 sloped to drain water away from the tank in accordance with NFPA

30.

3. Tank Foundation

The tank rests on a concrete ringwall. The foundation is equipped with 4 tell‐tale drains used for leak detection. A visual evaluation of the ringwall was conducted during the inspection for broken concrete, spalling, cracks, and vegetation against the bottom of the tank. The tank bottom‐to‐ringwall sealant was inspected with limited areas of damage found.

4. Tank Bottom

The interior bottom was not evaluated. The bottom is equipped with an impressed current cathodic protection system. The secondary tank bottom, installed in 2004, is located up 13‐ inches up from the original bottom.

5. Tank Shell

The shell is constructed from carbon steel of unknown material specification. The shell is a cylindrical design, butt‐welded together, consisting of six (6) courses. The shell exterior has a thin film urethane covered epoxy coating system. The coating was inspected for disbonding, adhesion, deterioration, and discoloration; it is in satisfactory 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. The shell was evaluated for remaining metal thickness utilizing ultrasonic technology. Thickness measurements are listed in the Engineering Data section in Appendix

B. A service life evaluation performed shows the shell with > 30 years of remaining life under current conditions. The engineering calculations, as per API‐653, for the service life evaluation are shown in Appendix A under "Service Life Evaluation.” Based on data collected during this inspection, the tank shell is structurally sound.

6. Tank Floating Roof

The tank is equipped with a double deck floating roof with pontoons. The floating roof has shoe type perimeter roof seals and opening gaskets that were visually inspected, due to safety reasons, from the top of the rolling ladder. No trace of fuel vapors was encountered during the visual inspection. The floating roof appears to be in satisfactory condition.

7. Tank Fixed Roof

The fixed roof is a self‐supported corrugated shed type steel roof. The shed is fastened to the top of the shell by bolts and screening material to a width of 6‐inches provided around the entire periphery of the roof. Inspected the sample gauge well that is equipped with a reel type retrieval system. The fixed roof is also equipped with an ENRAF ATG system and VITO water and temperature probe.

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) 18x24‐inch 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 welded and flanged stainless‐steel piping with 1‐inch welded and flanged stainless steel return piping. Both lines have 2‐inch double‐block and bleed valves located at the tank skin.

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

The product saver tank is properly grounded and vented.

b. Low Suction System

The tank is equipped with a 4‐inch low suction. The low suction piping is constructed of carbon steel material and does not tie into the issue line with thermal relief to complete the circuit.

c. Issue Line

The 10‐inch issue line is constructed from coated carbon steel material. The line is protected from over pressurization with a thermal relief system. The thermal relief system consists of 1‐inch welded and flanged carbon steel pipe and 1‐inch stainless steel fittings. The relief line is also equipped with a Visi‐Flo™ sight glass. The line is not equipped with a fuel sampling port.

d. Receipt Line

The 6‐inch receipt line is constructed from coated carbon steel material. The line is protected from over pressurization with a thermal relief system. The thermal relief system consists of 1‐inch welded and flanged carbon steel pipe and 1‐inch stainless steel fittings. The line is equipped with a fuel sampling port.

e. Automatic Tank Gauging (Fuel Level)

The tank is equipped with an ENRAF ATG 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 water and temperature probe for electronic water level gauging located at the edge of the tank. The probe is installed in a 6‐inch slotted aluminum stilling well.

g. Mechanical Tank Gauging

The tank is equipped with a Shand & Jurs mechanical tape level gauge for mechanical fuel level gauging.

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 ATG 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 mounted on the shell. The high‐level alarm assembly and high level shut‐off assembly are accessible from the spiral stairway platform. The piping consists of 1‐inch welded/flanged stainless‐steel pipe and fittings.

j. Ladder and Platforms

The top of the tank is accessible by a spiral stairway mounted on the shell of the tank.

The spiral stairway does have a platform at the level alarms. The stairway has a platform at the top to access the doors for entering the shed type corrugated steel fixed roof. The floating roof is accessed by a rolling ladder. The rolling ladder was subjected to minimal visual inspection and appears to be in adequate condition.

k. Grounding

The tank has four (4) grounding straps bolted to non‐reinforced lugs around the circumference of the tank.

l. Anchoring

The tank is not anchored to the foundation. Tank anchoring is primarily determined by seismic conditions in the area. Some military facilities have experienced flooding in the containment that resulted in tanks being lifted off of their foundations.

9. Tank Piping System

Fuel is received via trucks and issued to the flightline pentagraph systems.

10. Fire Protection System

The fire department provides fire protection. The facility is equipped with fire hydrants 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. Secondary Containment floor Cracks

OBSERVATION: The secondary containment has hairline and minor cracking, 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: Repair all exposed cracks in the secondary containment floor by grinding in a V‐shape pattern with at least ¼‐inch width at the surface and a depth of at least ¼‐inch and sealing with flexible urethane (e.g., Sikaflex 1c) or a similar approved sealant. (Quantity: 25 LF)

b. Secondary Containment Floor Conduit Penetrations

OBSERVATION: The conduit penetrations into the containment floor, are not in accordance with the standard design, 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). AW 78‐24‐27 Drawing CD.01, CD.03 and CD.04

RECOMMENDATION: Install geomembrane boots with stainless steel band clamps per AW 78‐24‐27. (Quantity: three (3) 1” conduits and two (2) 1/2” conduits)

c. Secondary Containment Drain Configuration

OBSERVATION: The secondary containment drain is not in accordance with the tank standard design. It is buried in the ground with just the stem showing. It has no post with indicator, and the valve appears to be a gate valve, 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). AW 78‐24‐27 Drawing CD.09

RECOMMENDATION: Reconfigure the dike drain valve to include installing a 100% port eccentric plug valve which conforms to AWWA C517 standards, also conforming to AW 78‐24‐27 Drawing CD.09. (Quantity: 1 drain valve)

d. ENRAF VITO Probe Face Plate Disconnected

OBSERVATION: The ENRAF VITO water and temperature probe face plate is not attached to the unit; electrical wires and components are exposed.

CODE REFERENCE: Manufacturer’s specifications

RECOMMENDATION: Re‐Attach the ENRAF VITO water and temperature probe face plate to ensure proper operation of the system. (Quantity: 6‐1” conduits, 1‐2” conduit and 1‐3/4” conduit)

e. Ringwall Foundation Cracking

OBSERVATION: The concrete ringwall has exposed hairline and minor cracks, 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) and API Standard 653 C.1.1.1 (a).

RECOMMENDATION: Repair all exposed cracks in the concrete ringwall by grinding in a V‐ shape pattern with at least ¼‐inch width at the surface and a depth of at least ¼‐inch and sealing with flexible urethane (e.g., Sikaflex 1c) or a similar approved sealant. (Quantity:

13 LF)

f. Pipe Support Coating Failure

OBSERVATION: The exterior pipe supports, located in the secondary containment, for both the 10” issue and 6” receipt lines have coating failure and associated corrosion present.

CODE REFERENCE: AW 78‐24‐27 Drawing CD.11 and CD.13 and UFGS 09 97 12.27

RECOMMENDATION: Clean and recoat the pipe supports with an epoxy coating system which meets the requirement of UFGS 09 97 13.27. (Quantity: 19 supports)

g. Coating Failure on Circumferential Stairway

OBSERVATION: The circumferential stairway has coating failure on the stairway treads, handrails, and stringers. Note: The stairway treads are fabricated from diamond plating, which could become a slipping hazard during inclement weather.

CODE REFERENCE: UFGS 09 97.13.27 (Exterior Coating of Steel Structures) API‐650 Table

8.15.

RECOMMENDATION: Clean and recoat areas of coating failure on the circumferential stairway to include treads, handrails, and stair stringers. Ensure all stair treads are constructed from grated material. (Quantity: approximately 900 SF)

h. Coating Failure on Shell Nozzles

OBSERVATION: The 2”‐ water draw and return line DBB plug valves and the 4” low suction nozzle have coating failure and associated corrosion present.

CODE REFERENCE: UFC 3‐460‐03 Section 8‐3.1 Section 6‐10 and UFGS 09 97.13.27 (Exterior

Coating of Steel Structures).

RECOMMENDATION: Mechanically clean and recoat areas of coating failure on the skin valves for the 4‐inch low suction nozzle and 2” water draw and return nozzles in accordance with UFGS 09 97.13.27. (Quantity: approximately 20 SF)

i. Coating Failure on 10” Issue Piping

OBSERVATION: The 10” issue line located inside of the containment has areas of chipped paint and associated corrosion present.

CODE REFERENCE: UFC 3‐460‐03 Section 8‐3.1 Section 6‐10 and UFGS 09 97.13.27 (Exterior

Coating of Steel Structures).

RECOMMENDATION: Mechanically clean and recoat areas of coating failure on the 10‐inch receipt line in accordance with UFGS 09 97.13.27. (Quantity: approximately 15 SF)

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. Tank Anchoring

OBSERVATION: The tank does not have any anchoring. Typically, tank anchoring is only required when determined by wind, seismic, and internal pressure evaluations. Tank anchoring also prevents tanks from floating and causing additional damage when the secondary containment sufficiently fills with liquid (water or fuel), and the tank does not have sufficient product. Tanks floating off their foundations has occurred at a few military installations.

CODE REFERENCE: AW 78‐24‐27 Drawing D.04 Details 1 and 2.

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, install an anchoring system for the tank designed in accordance with API 650 Section 5.12 and AW 78‐24‐27 Drawing D.04 Detail 1 and 2.

(Quantity: 1 tank system) Note: The width of the exposed ringwall may not support the installation of anchors for this tank.

b. Low‐Suction Line Configuration

OBSERVATION: The 4‐inch low suction line lacks a crossover connection to the issue line with means of thermal relief per AW 78‐24‐27 Drawings G.05 and D.10 Detail 4. Note: the

4‐inch low suction nozzle is located approximately seventy feet to the left of the 10‐inch issue line.

CODE REFERENCE: AW 78‐24‐27 Drawing G.05 and AW 78‐24‐27 Drawing D.10 Detail 4

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, reconfigure the 4‐inch low suction line per AW 78‐24‐27

Drawing G.05 and AW 78‐24‐27 Drawing D.10 Detail 4. (Quantity: 1)

d. Manway Cover Support Configuration

OBSERVATION: The 36‐inch first shell course manway cover supports do not conform to AW

78‐24‐27 Drawing D.10 Detail 3. Typically, davits are mounted to the manhole flange as recommended in AW 78‐24‐27. The current covers are supported by hinges.

CODE REFERENCE: AW 78‐24‐27 Drawing D.10 Detail 3, API 650 5.8.3.5

RECOMMENDATION: Replace the manway cover support hinges in accordance with AW 78‐

24‐27 Drawing D.10 Detail 3. (Quantity: 2)

e. Low Suction Line Reinforcement Plate Telltale Hole

OBSERVATION: The telltale hole on the reinforcement plate for the low suction line is open with minor corrosion in lieu of being packed with white grease to prevent insect nesting and buildup of debris per UFC 3‐460‐03 Section 8‐9.13.4.1.

CODE REFERENCE: UFC 3‐460‐03 Section 8‐9.13.4.1.

RECOMMENDATION: Provide white lithium grease in the telltale hole of the low suction line reinforcement plate to prevent insect nesting and buildup of debris. (Quantity: 1)

f. Issue Line Thermal Relief Configuration

OBSERVATION: The relief piping for the 10‐inch tank issue line is 1” in diameter and is constructed from a mixture of welded and flanged carbon and stainless‐steel piping (not entirely of stainless steel).

CODE REFERENCE: UFC 3‐460‐01 Section 9‐3.5.1 and AW 78‐24‐27 Drawing D.10 Detail 4

RECOMMENDATION: Reconfigure the thermal relief piping per AW 78‐24‐27 Drawing D.10 Detail 4. (Quantity: 1 system)

g. Receipt Line Thermal Relief Configuration

OBSERVATION: The relief piping for the 6‐inch tank receipt line is 1” in diameter and is constructed from a mixture of welded and flanged carbon and stainless‐steel piping (not entirely stainless steel). Note: The 6” hydraulic shut‐off valve has top‐coat failure.

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

RECOMMENDATION: Reconfigure the thermal relief piping to meet the requirements of AW 78‐24‐27 standard design. (Quantity: 1 system and 6SF of coating failure)

h. Issue Line Fuel Sample Connection

OBSERVATION: The tank 10‐inch issue line located inside of the berm lacks a fuel sample connection in accordance with the current standard design. Note: A fuel sample connection exists on the 6‐inch receipt line.

CODE REFERENCE: AW Standard 78‐24‐27 Drawings D.13 Detail 4

RECOMMENDATION: Install a fuel sample connection on the 10‐inch issue line in accordance with the current standard design. (Quantity: 1)

i. Tank Grounding Connections

OBSERVATION: The tank is equipped with four (4) ground cables attached to the shell. The ground cables lack 3‐ by 3‐ by 1/4‐inch‐thick stainless steel grounding lugs with 1/2‐inch radius corners and 6‐inch Ø carbon steel reinforcing plates. The cables are also bolted and not exothermically welded.

CODE REFERENCE: AW 78‐24‐27 Drawing ED.02 Details 1 and 2.

RECOMMENDATION: Reconfigure the grounding cables in accordance with the AW 78‐24‐27 Drawing ED.02 Details 1 and 2. (Quantity: 4)

j. Upper Manway Configuration

OBSERVATION: The tank is not equipped with a manway located above the IFR on high leg position as shown in AW 78‐24‐27 and UFC 3‐460‐01.

CODE REFERENCE: AW 78‐24‐27 Drawing D.10 Details 3 and 6, UFC 3‐460‐01 Table 8‐1 (c)

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, provide a 36‐inch manway located 3’6” above the IFR’s high leg position. (Quantity: 1)

k. Mechanical Tape Level Gauge Shell Support Pads

OBSERVATION: The shell supports of the Shand & Jurs mechanical tape level gauge (MTG) do not have reinforcement plates on the shell per AW 78‐24‐27 Drawing D.07 Detail 1.

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

RECOMMENDATION: Install reinforcement plates on the shell for the MTG supports in accordance with AW 78‐24‐27 Drawing D.07 Detail 1, if not removed. (Quantity: 4)

l. Stairway Personnel Grounding System

OBSERVATION: The tank stairway is not equipped with a copper grounding bar brazed to the handrail or a grounding lug with #4 bare copper wire connected to the tank grounding system.

CODE REFERENCE: AW 78‐24‐27 Drawing D.08 Detail 4.

RECOMMENDATION: Provide a personnel grounding system that meets the current standard design. (Quantity: One system)

m. Circumferential Stairway Design

OBSERVATION: The circumferential stairway treads are welded directly to the shell. The stairway configuration is not constructed as shown in AW 78‐24‐27 as a free‐standing stairway.

CODE REFERENCE: AW 78‐24‐27 Drawing D.11 Details 1, 2, and 4

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, provide a circumferential stairway designed in accordance with AW 78‐24‐27 Drawing D.11 Details 1, 2, and 4. (Quantity: 1 stairway)

n. Internal Floating Roof Design

OBSERVATION: The tank has a carbon steel double deck IFR with shoe type seals and not an aluminum honeycomb style IFR with double wiper seal as required by UFGS.

CODE REFERENCE: UFC 3‐460‐01 Section 8‐8.3 and UFGS 33 56 21.17 Section 2.13.2.

RECOMMENDATION: If major repairs are deemed appropriate for this tank, provide an aluminum honeycomb IFR with double wiper seals designed in accordance with UFGS.

(Quantity: 1)

o. Fixed Roof Design

OBSERVATION: The tank has a steel corrugated shed type roof installed and does not have a sloped fixed roof.

CODE REFERENCE: UFC 3‐460‐01 Sections 12‐3.4 and 12‐3.6, UFGS 09 97.13.17, UFGS 09

97.13.27, UFGS 33 56 21.17, AW 78‐24‐27 Drawing D.06 Details 1, 2, and 3, Drawing D.07

Details 2, 3, 4, and 5, Drawing D.08 Detail 2, Drawing D.09 Details 1, 2, and 3, Drawing

D.11 Detail 5, Drawing D.12 Details 2 and 3, API 650 Figure 5.22, API 653 Section 9.2.

RECOMMENDATION: If major rehabilitation and/or system upgrades are deemed appropriate for this tank system, demolish the existing shed type roof. Furnish and install new a 1/4‐inch minimum thickness carbon steel plate supported fixed roof, rafter‐column connection, and rafter‐shell connection per AW 78‐24‐27 Drawing D.06 Details 1, 2, and 3.

Provide the following roof‐mounted appurtenances:

1. One new 10‐inch reinforced carbon steel roof nozzle and 8‐inch slotted aluminum stilling well with manual winch and floating seal retriever for the sample gauge well per AW 78‐24‐27 Drawing D.07 Detail 2 (or modify existing). Provide a 3/8‐ inch‐thick datum plate welded to the stilling well guide supports and top of the datum plate shall be level with the bottom of the tank shell. Note: New strapping charts will be required for accurate manual gauging per UFGS 33 56 21.17.

(Quantity: 1)

2. One new 8‐inch reinforced carbon steel roof nozzle and 6‐inch slotted aluminum stilling well for the VITO ATG water probe well (or modify existing) per AW 78‐24‐

27 Drawing D.07 Details 3 and 5. (Quantity: 1)

3. One new 10‐inch reinforced carbon steel roof nozzle and 8‐inch slotted aluminum stilling well for the ENRAF ATG well (or modify existing) per AW 78‐24‐27 Drawing

D.07 Detail 4. Provide a 3/8‐inch‐thick datum plate welded to the stilling well guide supports and top of the datum plate shall be level with the bottom of the tank shell. Note: The ENRAF ATG alarm setpoint values must be recalibrated.

(Quantity: 1)

4. Ten 18‐inch L by 24‐inch W roof circulation vents/inspection hatches with 3‐ft. W by 4‐ft. L carbon steel reinforcement plates per AW 78‐24‐27 Drawing D.09 Detail

1. Note: The spacing between roof and/or shell circulation vents shall not exceed

32‐foot intervals per API Standard 650 Section H.5.2.2. (Quantity: 10)

5. One 24‐inch reinforced carbon steel center roof vent per AW 78‐24‐27 Drawing

D.09 Detail 2. (Quantity: 1)

6. Two scaffold cable supports near the center of the fixed roof per AW 78‐24‐27

Drawing 5.01 and API 650 Figure 5.22. (Quantity: 2)

7. One 24‐inch W by 72‐inch L reinforced carbon steel pan installation hatch per the

IFR manufacturer’s recommendations and AW 78‐24‐27 Drawing 5.01. (Quantity:

1)

8. One roof perimeter guardrail per AW 78‐24‐27 Drawing D.11 Detail 5. (Quantity:

142 LF)

9. Remove the existing shell overflow/circulation vents and install butt‐welded inserts per API Standard 653 Section 9.2. (Quantity: 4)

10. Four new 3‐1/2‐ft. W by 1‐1/2‐ft. H shell overflow/circulation vents with a ½‐inch stainless steel wire bird screen and three ea. 10‐gauge steel 8‐inch W by 12‐inch H overflow openings per vent per AW 78‐24‐27 Drawing D.07 Detail 6. (Quantity: 4)

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 = 42.5 feet

G = 0.84

Y = 63 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 Unknown 6.02 35.92 23,600 0.85 0.162 0.25 0.234 2 Unknown 7.5 29.9 23,600 0.85 0.134 0.25 0.231 3 Unknown 7.44 22.4 26,000 0.85 0.1 0.25 0.242 4 Unknown 7.46 14.96 26,000 0.85 0.1 0.25 0.242 5 Unknown 7.44 7.5 26,000 0.85 0.1 0.25 0.238 6 Unknown 2.33 0.06 26,000 0.85 0.1 0.25 0.242

*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 0.00025 285 5 15 2 0.00030 322 5 15 3 0.00013 1118 5 15 4 0.00013 1118 5 15 5 0.00019 724 5 15 6 0.00013 1118 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

0.00035

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

2023 0.234 0.162 2028 0.233 0.162 2033 0.231 0.162 2043 0.229 0.162 2053 0.226 0.162

*based on same service and corrosion rates.

Course #2:

Year Thickness tmin

2023 0.231 0.134 2028 0.229 0.134 2033 0.228 0.134 2043 0.225 0.134 2053 0.222 0.134

*based on same service and corrosion rates.

Current Thickness:

Current Thickness:

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

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

0.000

0.050

0.100

0.150

0.200

0.250

2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049 2051 2053

In ch es

Year

Course #1 Projected Thickness Graph

Thickness tmin

0.000

0.050

0.100

0.150

0.200

0.250

2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049 2051 2053

In ch es

Year

Course #2 Projected Thickness Graph

Thickness tmin

Course #3:

Year Thickness tmin

2023 0.242 0.100 2028 0.241 0.100 2033 0.241 0.100 2043 0.239 0.100 2053 0.238 0.100

*based on same service and corrosion rates.

Course #4:

Year Thickness tmin

2023 0.242 0.100 2028 0.241 0.100 2033 0.241 0.100 2043 0.239 0.100 2053 0.238 0.100

*based on same service and corrosion rates.

Current Thickness:

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

Current Thickness:

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

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

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

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049 2051 2053

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

2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049 2051 2053

In ch es

Year

Course #4 Projected Thickness Graph

Course #5:

Year Thickness tmin

2023 0.238 0.100 2028 0.237 0.100 2033 0.236 0.100 2043 0.234 0.100 2053 0.232 0.100

*based on same service and corrosion rates.

Course #6:

Year Thickness tmin

2023 0.242 0.100 2028 0.241 0.100 2033 0.241 0.100 2043 0.239 0.100 2053 0.238 0.100

*based on same service and corrosion rates.

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

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

Anticpated Thickness (30 yrs)*

Current Thickness:

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

Current Thickness:

Anticpated Thickness (5 yrs)*

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049 2051 2053

In ch es

Year

Course #6 Projected Thickness Graph

Thickness tmin

0.000

0.050

0.100

0.150

0.200

0.250

2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049 2051 2053

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 = 42.5 feet

N = 8

L = 3.14(42.5)/8 = 16.6897 feet

Y = 30,000 psi

E = 29,000,000 psi

H = 38.83 feet

L = 278.5465 square feet

11(278.5465)(30,000)

2(29,000,000)(38.83)

1) Maximum Permissible Out-of-Plane Deflection Calculation

S max = = 0.0408 feet

𝑆𝑚𝑎𝑥 = 11𝐿2𝑌

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 0.00500 0.00000 0.00500 0.00236 0.00319 0.00319 0.00223

2 0.00417 0.00098 0.00319 0.00500 0.00333 0.00333 0.00098

3 0.00667 0.00333 0.00333 0.00319 -0.00236 -0.00236 0.00292

4 0.00333 0.00569 -0.00236 0.00333 -0.00167 -0.00167 0.00319

5 0.00500 0.00667 -0.00167 -0.00236 -0.00569 -0.00569 0.00236

6 0.00000 0.00569 -0.00569 -0.00167 -0.00250 -0.00250 0.00361

7 0.00083 0.00333 -0.00250 -0.00569 0.00236 0.00236 0.00083

8 0.00333 0.00098 0.00236 -0.00250 0.00500 0.00500 0.00111

R = 0.59 Note: Settlement evaluation must be done using the arc length method.

1) Out-of-Plane Deflection Calculation

Shell Settlement Graph

0.005

0.01

6 7 8 1 2 3 4 5 6

E le va ti o n 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 Type:Open Tank Top

K = 28.7

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

1 3 5 4 33.3794 0.0300 1.0847 Pass

2 5 8 6 50.0691 0.0533 1.6270 Pass

3 8 1 1 16.6897 0.0000 0.5423 Pass

4 1 3 2 33.3794 0.0200 1.0847 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 less than 0.9)

Si < Smax →

Si < Smax →

Si < Smax →

Si < Smax →

Arc Length Evaluation

𝑆𝑚𝑎𝑥 = 𝑚𝑖𝑛 𝑘 × 𝑆𝑎𝑟𝑐 × 𝐷

𝐻

𝑌

𝐸 , 4.0

0.08 0.06

0.04

0.06

0.08

0.25

3 4 5 6 7 8 1 2 3

E le va ti o n s (i n ch es

Data Points

Appendix B

Engineering Drawings

1. Tank Layout

2. Containment Layout

3. Floating Roof Layout

Appendix B

Engineering Drawings

1. Tank Layout

2. Containment Layout

3. Floating Roof Layout

Owner/Operator:

Inspection Firm:

Date: Revision Number: Revision Date:

Drawing Title: Drawing Number:

Andrews Air Force Base - Andrews, MD

InterSpec, LLC.

06/06/2023 N/A N/A Tank Description:

Tank 10 (Fac. 3036) S-1Shell Layout [1 of 2]

Remarks/Legend:

Tank has a diameter of 42'-6", and a tank height of 38'-10".

A - 36" Manway B - 4" Low Suction C - 2" Water Draw D - 2" Product Return E - 1" Alarm Assembly F - 1" Alarm Assembly G - 1" Low Level Alarm H - 1" Low Low Level Alarm

A

ATG

B C D

G

H

E

F

Date: Revision Number: Revision Date:

Drawing Title: Drawing Number:

Andrews Air Force Base - Andrews, MD

InterSpec, LLC.

06/06/2023 N/A N/A Tank Description:

Tank 10 (Fac. 3036) S-1Shell Layout [2 of 2]

Remarks/Legend:

Tank has a diameter of 42'-6", and a tank height of 38'-10".

I - 36" Manway J - 6" Receipt K - 1" Threaded Plug L - 1" Threaded Plug M - 10" Issue

I

J

K

L

M

A

Remarks/Legend:

Inspection Firm:

Date: Revision Number: Revision Date:

Drawing Title: Drawing Number:

Andrews Air Force Base - Andrews, MD

InterSpec, LLC.

06/06/2023 N/A N/A Tank Description:

Tank 10 (Fac. 3036) R-1Floating Roof Layout [1 of 1]

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 42'-6", and a shell height of 38'-10".

- 20" Pontoon Cover

- Floating Roof Leg

1 2 3 4

5 6 7

8 9 10

11 12 13 14

15 16 17

18 19 20

22 23

P

P

P

P

P

P

P

P

P

P

P

P Rolling Ladder Track

24" Manway

Vacuum Breaker Stem

Floating Roof Sump

Emergency Roof Drain

20" Pontoon Cover

8" Stilling Well

8" Electronic Stilling Well

6" Rim Vent

P

Date: Revision Number: Revision Date:

Drawing Title: Drawing Number:

Andrews Air Force Base - Andrews, MD

InterSpec, LLC.

06/06/2023 N/A N/A Tank Description:

Tank 10 (Fac. 3036) C-1Containment Layout [1 of 1]

Remarks/Legend:

Tank has a diameter of 42'-6", and a tank height of 38'-10".

- 6" Receipt

- 10" Issue

- Repainted Cracks

- New Cracks

137'

130' Tank 10

2" Water Draw

2" Return

To Tank 8To Truck Fill Stand

Appendix C

Engineering Data

1. Shell Settlement Measurements

2. First Shell Course Plate Thickness Measurements

3. Shell Drop Thickness Measurements

4. Shell Nozzle and Nozzle Reinforcement

5. Accessway Measurements

Shell Settlement Measurements

1 80

2 80 1/16

3 79 7/8

4 80 1/16

5 80

6 80 1/16

7 80 1/16

8 80

NOTE: The Rod Heights are based on the actual height of the transit at the time of the data collection. This data should only be used for this report. Point #1 is located at Vertical Shell Seam

#1.

Point

No. Rod Height (inches)

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

1 0.241 51 0.245 101 0.255

2 0.237 52 0.246 102 0.253

3 0.243 53 0.255 103 0.255

4 0.242 54 0.229 104 0.258

5 0.245 55 0.249 105 0.259

6 0.243 56 0.256 106 0.255

7 0.241 57 0.254 107 0.248

8 0.246 58 0.248 108 0.246

9 0.243 59 0.253 109 0.244

10 0.242 60 0.250 110 0.242

11 0.241 61 0.252 111 0.246

12 0.242 62 0.250 112 0.247

13 0.243 63 0.250 113 0.245

14 0.244 64 0.251 114 0.492

15 0.244 65 0.252 115 0.496

16 0.245 66 0.253 116 0.495

17 0.494 67 0.253 117 0.248

18 0.498 68 0.249 118 0.247

19 0.492 69 0.252 119 0.247

20 0.496 70 0.253 120 0.247

21 0.498 71 0.253 121 0.247

22 0.498 72 0.254 122 0.255

23 0.497 73 0.258 123 0.253

24 0.498 74 0.252 124 0.248

25 0.495 75 0.256 125 0.247

26 0.495 76 0.254 126 0.249

27 0.497 77 0.256 127 0.243

28 0.496 78 0.253 128 0.251

29 0.234 79 0.256 129 0.249

30 0.234 80 0.257 130 0.246

31 0.237 81 0.256 131 0.24

32 0.235 82 0.257 132 0.242

33 0.236 83 0.254 133 0.243

34 0.239 84 0.253 134 0.243

35 0.241 85 0.247

36 0.238 86 0.251

37 0.241 87 0.251

38 0.245 88 0.251

39 0.241 89 0.250

40 0.241 90 0.486

41 0.241 91 0.485

42 0.245 92 0.486

43 0.245 93 0.487

44 0.237 94 0.486

45 0.244 95 0.487

46 0.243 96 0.485

47 0.246 97 0.485

48 0.249 98 0.485

49 0.245 99 0.248

50 0.248 100 0.253

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

Location # Thickness in inches Location #

Thickness in inches Location #

Thickness in inches

1 2 3 4 5 6 7 8 9

0.250 0.248 0.247 0.253 0.250 0.252 0.253 0.250 0.250

0.253 0.251 0.251 0.251 0.249 0.252 0.252 0.248 0.250

0.249 0.249 0.250 0.249 0.248 0.250 0.250 0.251 0.250

0.253 0.250 0.252 0.251 0.249 0.255 0.249 0.251 0.252

0.253 0.253 0.166 0.250 0.253 0.254 0.254 0.253 0.250

1 - 2

Thickness Measurements (inches)

Point Numbers

Shell…