Hancock-Fac 20005 (Tank 2)-FINAL-2015.pdf

TANK 2 (Facility 20005) INSPECTION REPORT API 653 In-Service (External) Inspection

Hancock Field ANG

Mattydale, New York

Prepared For:

U.S. Army Corps of Engineers

Omaha District 106 South 15th Street

Omaha, Nebraska 68102

Submitted By:

Pond and Company

3500 Parkway Lane, Suite 600 Norcross, GA 30092

Telephone: 678-336-7740 Facsimile: 678-336-7744 www.pondco.com

August 2015

Tank 2 – API 653 Inspection Report Pond and Company Hancock Field ANG – Mattydale, New York 1150068 i

PREFACE

Pond & Company, Inc. was under contract to the U.S. Army Corps of Engineers (USACE), Omaha

District to provide an in-service (external) tank inspection on Tank 2 (Facility 20005) at Hancock Field

Air National Guard (ANG) in Mattydale, New York.

There are no mandatory repairs required to remove Tank 2 from service. Additional recommendations for repair and upgrade have been made to prolong tank integrity and maintain product quality. This document presents findings of the tank inspection and testing, as well as the recommendations regarding repairs and upgrades.

Anthony E. Chinn performed the API-653 in-service (external) inspection and Brian W. Lunsford, P.E.

reviewed the API 653 inspection report.

10 August 2015

Anthony E. Chinn, E.I.T. Date Integrity Engineer ASNT NDT Level II API 653 Inspector # 50662

10 August 2015

Brian W. Lunsford, P.E. Date Sr. Project Manager Integrity Engineer API 653 Inspector # 28526 ii

TABLE OF CONTENTS

SECTION 1

EXECUTIVE SUMMARY .................................................................................................................. 1-1

SECTION 2

TANK PHYSICAL AND HISTORICAL DATA .................................................................................... 2-1

SECTION 3

NON-DESTRUCTIVE TESTING ....................................................................................................... 3-1

3.1 NDT Inspection Scope of Work .................................................................................... 3-1

3.2 Equipment Used .......................................................................................................... 3-1

3.3 NDT Significant Findings ............................................................................................. 3-1

3.4 Bottom-to-Shell Weld Examination .............................................................................. 3-1

3.5 Shell Examination ........................................................................................................ 3-1

3.6 Shell Nozzle Examination ............................................................................................ 3-2

3.7 Fixed Roof Examination ............................................................................................... 3-2

3.8 Fixed Roof Nozzle Examination ................................................................................... 3-2

SECTION 4

SIGNIFICANT FINDINGS ................................................................................................................. 4-1

4.1 Foundation and Containment ....................................................................................... 4-1

4.2 Shell, Nozzles and Appurtenances .............................................................................. 4-1

4.3 Fixed Roof, Nozzles and Appurtenances ..................................................................... 4-1

4.4 Level Alarms and Gauging System .............................................................................. 4-2

SECTION 5

RECOMMENDATIONS ..................................................................................................................... 5-1

5.1 Repair and Upgrade Recommendations ...................................................................... 5-1

5.1.1 Mandatory Repairs Required to Remove Tank from Service ............................. 5-1

5.1.2 Repairs Required to Fully Comply with API 653 / 650 ........................................ 5-1

5.1.3 Repairs Required to Fully Comply with UFC 3-460-01 / 3-460-03 ...................... 5-1

5.1.4 Recommended Repairs As Best Management Practice ..................................... 5-2

5.2 Inspection Intervals ...................................................................................................... 5-2

APPENDICES

APPENDIX A (CAD Drawings) .......................................................................................................... A-1

APPENDIX B (Tank Inspection Data) ................................................................................................ B-1

APPENDIX C (API 653 Inspection Checklist) .................................................................................... C-1

APPENDIX D (Calculations) .............................................................................................................. D-1

APPENDIX E (Photographs) ............................................................................................................. E-1 iii

ABBREVIATIONS AND ACRONYMS

AFFF Aqueous Film-Forming Foam

ANG Air National Guard

API American Petroleum Institute

ATG Automatic Tank Gauge

AVG Average

BBL Barrels

BMP Best Management Practice

DB&B Double Block & Bleed

DFT Dry Film Thickness

FT Foot/Feet

GE General Electric

HHLA High-High Level Alarm

HLA High Level Alarm

HLCV High Level Control Valve

IAW In Accordance With

ICCP Impressed Current Cathodic Protection

IFR Internal Floating Roof

IN Inch/Inches

LLA Low Level Alarm

MIL-STD Military Standard

MW Manway

N/A Not Applicable

NDT Non Destructive Testing

NFPA National Fire Protection Association

PE Professional Engineer

TYP Typical

UFC Unified Facilities Criteria

USACE U.S. Army Corps of Engineers

UTT Ultrasonic Thickness Testing

VT Visual Testing

W/ With

1-1

SECTION 1

EXECUTIVE SUMMARY

Tank 2 (Facility 20005) is located at Hancock ANG in Mattydale, New York. Tank 2 is a welded, steel, vertical aboveground Jet-A (F-24) storage tank that was fabricated and erected by Pittsburg Tank &

Tower Company in 1996 in accordance with (IAW) American Petroleum Institute (API) 650, 9th Edition, Appendix E, F and H. Tank 2 is 27’-0” in diameter and 28’-3” high with a nominal capacity of 2,500 barrels (BBL). The in-service inspection was performed on 22 July 2015. Results of this inspection will provide recommended repairs and upgrades required to comply with applicable industry and military standards.

Testing and inspection were performed IAW applicable sections of API 653, 5th Edition. Contained in this report is a detailed account of the tank inspection, a summary of the non-destructive testing (NDT), and conclusions derived from the inspection and testing. Findings from this inspection are further detailed in Section 4 of this report. Repairs and upgrades identified in this section are further classified and listed in Section 5 of this report.

Foundation and Containment

Tank 2 is located in a concrete containment dike lined with a thick-mil coating. Approximately 118 linear feet of the thick-mil coating exhibits cracking along the concrete dike perimeter. The tank perimeter rests on a 27” high concrete ring wall foundation. The foundation is equipped with thirteen (13) equally spaced seismic anchors and six (6) grounding lugs and cables. All grounding cables are in good condition with no signs of damage or detachment.

The tank bottom is provided with a leak detection system via four (4) equally spaced tell-tale pipes along the concrete ring wall.

Tank Shell

The tank shell consists of four (4) butt-welded A-36 steel shell courses. External coating on the tank shell is in good overall condition with no indications of coating failure. The tank is provided with standardized product designation IAW Military Standard (MIL-STD)-161G; however, the tank is not provided with a National Fire Protection Agency (NFPA) emergency responder diamond.

Shell nozzles consist of three (3) 36” manways, one (1) 10” product receipt, one (1) 12” main suction, one

(1) 4” low suction, two (2) 4” aqueous film-forming foam (AFFF) discharge penetrations, six (6) 1” penetrations for the high-high level alarm (HHLA) sensor, low level alarm (LLA) sensor, high level alarm

(HLA) sensor, and high level control valve (HLCV) shut-off switch chamber, one (1) 1” threaded plug, and one (1) 1” water draw-off. Tell-tale holes for manway (MW) 1, MW2, and MW3 reinforcement pads are plugged. All three (3) tell-tale holes should be unplugged to aid in determining if weeping has occurred between the tank shell and reinforcement pad.

External coating for the HLCV body and the product receipt, main suction, and low suction double block and bleed (DB&B) valves exhibit approximately 4 ft2 of flaking, staining, and surface corrosion. Transfer

1-2 piping for the AFFF discharge chamber is capped off. No action is required as Tank 2 is provided with a full contact, aluminum honeycomb internal floating roof (IFR). The IFR provides adequate fire protection for tanks storing Jet-A.

Thermal relief valves (TRV) for the product receipt and main suction lines are mounted horizontally with non-standard crossover piping. At this current configuration, there is a possibility that both TRVs will not provide adequate relief in the event of over pressurization.

Fixed Roof

The fixed roof is of lap-welded, steel, cone-up construction. External coating on the fixed roof is in good overall condition with no indications of coating failure. The fixed roof is equipped with six (6) perimeter fiberglass patches of various sizes.

Fixed roof nozzles consist of two (2) 3” penetrations for the IFR anti-rotation cable, one (1) 8” automatic tank gauge (ATG)/gauging hatch, one (1) 30” manway, one (1) 4” blind flange, one (1) 72” x 24” inspection hatch, two (2) 4” tie-offs, one (1) 12” center vent, and one (1) 3” penetration for the IFR grounding cable.

External coating at the 4” blind flange exhibits approximately 1 ft2 of flaking, staining, and surface corrosion.

The tank is provided with an aluminum honeycomb IFR. The IFR is provided with a secondary peripheral wiper seal. Visually from the fixed roof manway, the secondary peripheral wiper seal is in good overall condition with no signs of damage or compromise. The primary seal type and condition is unknown due to limited access.

Gauges and Alarms

The tank is equipped with a roof mounted Cameron ATG system for automatic tank gauging. The tank is equipped with an 8” manual gauging hatch for tank gauging operations. The 8” gauging hatch is provided with a fully slotted stilling well and the Cameron ATG system is integrated with the 8” gauging hatch.

The tank is provided with a shell mounted LLA sensor, HLA sensor, and HHLA sensor. For overfill protection, there is a shell mounted HLCV shut-off switch chamber and a HLCV at the product receipt.

The tank is not provided with a liquid level gauge for monitoring liquid level from the ground level.

Cathodic Protection

The tank bottom is provided with an impressed current cathodic protection (ICCP) system. The ICCP rectifier was on during the inspection; however, the panel voltmeter and ammeter read zero voltage and amperage indicating that the tank bottom is not cathodically protected.

1-3

Recommendations for Repair and Upgrade

Below is a summary of the repair and upgrade recommendations identified during the external API

653 inspection:

1. Unplug tell-tale holes at MW1, MW2, and MW3 reinforcement pads. Perform a pressure test at each reinforcement pad. (API)

2. Troubleshoot the tank ICCP system. (UFC)

3. Provide the tank with a liquid level gauge calibrated in 1/16” increments. (UFC)

4. Mount two (2) TRVs at the product receipt and main suction lines vertically per UFC and manufacturer’s requirements. (UFC)

5. Recoat approximately 118 linear feet of thick-mil coating along the containment dike perimeter.

(UFC)

6. Provide approximately 5 ft2 of spot coating repair at the tank shell and fixed roof nozzles. (UFC)

7. Replace the Cameron ATG system with an Enraf ATG system and VITO temperature/water combination probe. Provide the Enraf ATG and VITO combination probe with fully slotted stilling wells. (UFC)

8. Provide the tank with a NFPA emergency responder diamond IAW NFPA 704. (UFC)

Recommended Inspections and Intervals

Routine In-Service Inspection by Facility Personnel: Monthly

External Inspection by Authorized Inspector: Five (5) Years; June 2020

External Inspection by Authorized Inspector w/ UTT: Fifteen (15) Years; June 2030

Internal Inspection by Authorized Inspector*: Immediately or Ten (10) Years

*No previous out-of-service API 653 inspection records were available for review and comparison. As a result, it is recommended to perform the next internal inspection immediately. In the event that the previous out-of-service inspection records are found, the next internal inspection should be performed within ten (10) years of the previous inspection.

2-1

SECTION 2

TANK PHYSICAL AND HISTORICAL DATA

Owner: Air National Guard

Tank Number: Tank 2 (Facility 20005)

Location: Mattydale, New York

Fabricated By: Pittsburg Tank & Tower Company

Erected By: Pittsburg Tank & Tower Company

Design Standard: API 650, 9TH Edition, Appendix E, F & H

Year Built: 1996

Product: Jet-A (F-24)

Product Specific Gravity: 0.80

Diameter: 27’-0”

Height: 28’-3”

Design Liquid Level: 25’-0”

Nominal Capacity: 2,500 BBL (105,000 Gallons)

Foundation: Concrete Ring Wall

Bottom Construction: N/A – External Inspection

Shell Construction: Butt-Welded A36 Steel Plates / Four (4) Shell Courses

Fixed Roof Construction: Lap-Welded Steel Plates / Cone-Up / Self- Supported

Internal Floating Roof Construction: Aluminum Honeycomb

Cathodic Protection: Impressed Current

Leak Detection: Four (4) Perimeter Tell-tale Pipes

Bottom Coating: N/A – External Inspection

Shell Coating Internal: N/A – External Inspection

Shell Coating External: White Epoxy

Fixed Roof Internal Coating: N/A – External Inspection

Fixed Roof External Coating: White Epoxy

Stairway Construction: Spiral Staircase with an Intermediate and Upper Platform

Last Inspection: Unknown

Average Bottom Plate Thickness: N/A – External Inspection

Average Shell Plate Thickness: Shell Course 1: 0.252” Shell Course 2: 0.257” Shell Course 3: 0.257” Shell Course 4: 0.253”

Average Fixed Roof Plate Thickness: 0.185”

GPS Coordinates: N 43° 6' 9.76" W 76° 5' 53.75"

Notes:

MW1 is stenciled with a cleaning date of 13 May 2009; however, no inspection date was identified.

3-1

SECTION 3

NON-DESTRUCTIVE TESTING

3.1 NDT Inspection Scope of Work

The following NDT examinations were performed to evaluate the tank integrity.

• A Visual Test (VT) was performed on the tank containment, as well as piping and valves located inside the containment.

• VT was performed on external surfaces of the tank shell and fixed roof.

• VT was performed on the tank nozzles, coatings, appurtenances, and ancillary equipment.

• Ultrasonic thickness testing (UTT) measurements were taken on the tank nozzles, reinforcement pads, shell plates, and fixed roof plates.

• Dry Film Thickness (DFT) measurements were taken on the external tank shell and fixed roof coatings.

• An external settlement survey was performed on the tank foundation.

3.2 Equipment Used

• GE Krautkramer Ultrasonic Thickness Gauge w/ Topcoat o M/N DMS GO+

• Fisher Technologies Dry Film Thickness Gauge o M/N Dual Scope MPOR

• Zip Level Pro-2000 High Precision Altimeter

3.3 NDT Significant Findings

UTT measurements indicated no significant metal thinning on the tank nozzles, reinforcement pads, shell plates, and fixed roof plates. The tank shell and fixed roof coating is in good condition with no indications of coating failure.

3.4 Bottom-to-Shell Weld Examination

The external bottom-to-shell weld was examined using VT methods. There were no significant findings. The examination was limited due to external coating.

3.5 Shell Examination

Shell plates were examined using UTT and VT methods. Nine (9) UTT measurements were taken on each plate of the 1st shell course. Nine (9) UTT measurements were taken on the remaining shell course plates using the spiral staircase and intermediate platform for access.

Refer to Drawing A-1, “Shell Layout” for plate locations and Table B-1, “Shell Plate Ultrasonic

Thickness Readings” for thickness data.

3-2

3.6 Shell Nozzle Examination

Shell nozzles and reinforcement pads were inspected by UTT and VT testing methods. One (1) UTT measurement was taken on each nozzle with a welded connection and on each reinforcement pad.

Refer to Drawings A-1, “Shell Layout” for nozzle locations and Table B-3, “Nozzles and

Appurtenances” for nozzle data.

3.7 Fixed Roof Examination

Fixed roof plates were examined using UTT and VT methods. Five (5) UTT measurements were taken on each roof plate.

Refer to Drawing A-2, “Fixed Roof Layout” for plate locations and Table B-2, “Roof Plate Ultrasonic

Thickness Readings” for plate thickness data.

3.8 Fixed Roof Nozzle Examination

Fixed roof nozzles and reinforcement pads were examined using UTT and VT methods. One (1) UTT measurement was taken on each nozzle with a welded connection and on each reinforcement pad.

Refer to Drawing A-2, “Fixed Roof Layout” for nozzle locations and Table B-3, “Nozzles and

Appurtenances” for nozzle data.

4-1

SECTION 4

SIGNIFICANT FINDINGS

4.1 Foundation and Containment

• The tank is located in a concrete containment dike lined with thick-mil coating. Approximately 118 linear feet of cracked coating was observed along the concrete dike perimeter.

• The tank perimeter rests on a 27” high concrete ring wall.

• The tank is equipped with thirteen (13) equally spaced seismic anchors and six (6) grounding cables and lugs. All grounding cables are in good condition with no signs of damage or detachment.

• The tank bottom is provided with an ICCP system. The ICCP rectifier voltmeter and ammeter read zero voltage and amperage during the time of inspection.

• The tank bottom is provided with four (4) perimeter leak detection tell-tale pipes. Each tell-tale pipe is provided with a locked 2” ball valve.

4.2 Shell, Nozzles and Appurtenances

• The shell is equipped with four (4) fully coated butt-welded A-36 steel shell courses.

• The shell is equipped with a spiral staircase, intermediate, and upper platform for accessing MW2, HLA sensor, HLCV shut-off switch chamber, and fixed roof.

• The tank shell is provided with standardized product designation IAW MIL-STD-161G; however, the tank is not provided with a NFPA emergency responder diamond.

• Shell nozzles consist of three (3) 36” manways, one (1) 10” product receipt, one (1) 12” main suction, one (1) 4” low suction, two (2) 4” AFFF discharge penetrations, six (6) 1” penetrations for the HHLA sensor, LLA sensor, HLA sensor, and HLCV shut-off switch chamber, one (1) 1” threaded plug, and one (1) 1” water draw-off.

• Tell-tale holes for MW1, MW2, and MW3 reinforcement pads are plugged.

• External coating for the HLCV body and the product receipt, main suction, and low suction DB&B valves exhibit flaking, staining, and surface corrosion.

• TRVs for the product receipt and main suction lines are mounted horizontally with non-standard crossover piping.

• AFFF transfer piping for both AFFF discharge chambers are capped off.

4.3 Fixed Roof, Nozzles and Appurtenances

• The fixed roof is of cone-up construction with fully coated lap-welded steel plates.

• Fixed roof nozzles consist of two (2) 3” penetrations for the IFR anti-rotation cable, one (1) 8”

ATG/gauging hatch, one (1) 30” manway, one (1) 4” blind flange, one (1) 72” x 24” inspection

4-2 hatch, two (2) 4” tie-offs, one (1) 12” center vent, and one (1) 3” penetration for the IFR grounding cable.

• The fixed roof is provided with six (6) perimeter fiberglass patches. The fiberglass patches are of various sizes.

• The fixed roof is equipped with four (4) perimeter vents with mesh screening.

• The fixed roof is equipped with a full perimeter handrail and toe board.

• The tank is provided with an aluminum honeycomb IFR. The IFR is provided with a secondary peripheral wiper seal.

4.4 Level Alarms and Gauging System

• The tank is equipped with a Cameron ATG system for automatic tank gauging.

• The fixed roof is equipped with an 8” manual gauging hatch for tank gauging operations. The 8” gauging hatch is provided with a fully slotted stilling well and the Cameron ATG system is integrated with the 8” manual gauging hatch.

• The tank is equipped with a shell mounted LLA sensor, HLA sensor, and HHLA sensor.

• The tank is not equipped with a liquid level gauge for monitoring liquid level from ground level.

• For overfill protection, the tank is equipped with a HLCV at the product receipt and a shell mounted

HLCV shut-off switch chamber.

5-1

SECTION 5

RECOMMENDATIONS

5.1 Repair and Upgrade Recommendations

The following subsections outline the itemized tank repairs/upgrades.

5.1.1 Mandatory Repairs Required to Remove Tank from Service

Mandatory repairs are repairs required to maintain hydraulic and structural integrity over the required 5-year in-service (external) inspection interval.

No mandatory repairs required to remove tank from service.

5.1.2 Repairs Required to Fully Comply with API 653 / 650

Recommendation 1: Unplug tell-tale holes at MW1, MW2, and MW3 reinforcement pads. Perform a pressure test at each reinforcement pad to verify internal weld integrity. Provide the unplugged tell-tale holes with heavy grease to prevent water ingress between the reinforcement pad and shell plate.

5.1.3 Repairs Required to Fully Comply with UFC 3-460-01 / 3-460-03

Recommendation 2: Troubleshoot the ICCP system.

Recommendation 3: Provide the tank with a liquid level gauge calibrated in 1/16” increments. The liquid level gauge should be mounted approximately 60” above walking surface.

Recommendation 4: Mount two (2) TRVs at the product receipt and main suction lines vertically per

UFC and manufacturer’s requirements.

Recommendation 5: Recoat approximately 118 linear feet of thick mil coating along the containment dike perimeter.

Recommendation 6: Provide approximately 5 ft2 of spot coating repair at the HLCV body, the product receipt, main suction and low suction DB&B valves, and the fixed roof 4” blind flange.

Recommendation 7: Replace the Cameron ATG system with an Enraf ATG system and VITO temperature/water combination probe. The Enraf ATG and VITO combination probe should be provided with fully slotted stilling wells. The VITO combination probe should be located directly above the tank sump, or at the lowest feasible point.

Recommendation 8: Provide the tank with an emergency responder diamond IAW NFPA 704.

5-2

5.1.4 Recommended Repairs As Best Management Practice

Repairs required as Best Management Practice are recommended to extend the tank service life and maintain product quality, but are not necessarily part of a design or inspection standard.

No recommended repairs are required as BMP.

5.2 Inspection Intervals

The interval between tank inspections (both internal and external) should be determined by the tank service history. Inspection intervals can be adjusted based on known corrosion rates. Corrosion rates can only be determined when a comparison is made between measurements taken over an interval of time. The previous API 653 inspection report was not available for review and comparison.

Listed below are the recommended inspection intervals per API 653:

• Routine monthly inspections to monitor the external condition of the tank and associated piping.

Gross defects, leaks, shell distortions, signs of settlement, and corrosion should all be monitored along with the foundation condition (includes tank chime to foundation interface), coatings, and appurtenances. The fixed roof should be visually inspected for signs of damage.

• Formal visual external inspection by an API certified inspector every 5 years or RCA/4N years

(where RCA is the difference between the measured shell thickness and the minimum required thickness and N is the shell corrosion rate), whichever is less. Based on the review of shell and roof thickness measurements, the 5-year interval will govern the next formal external visual inspection.

• Ultrasonic thickness measurements of the shell plates can be performed with the tank in service and can be scheduled at a maximum interval of fifteen (15) years or RCA/2N, whichever is less.

Based on shell thickness measurements, the recommended interval for the UTT measurements on the tank shell is fifteen (15) years.

• Bottom corrosion rates govern the internal inspection interval. Per API 653, the next internal inspection should be performed within twenty (20) years of the previous inspection; however, UFC

3-460-03 requires a maximum internal inspection interval of ten (10) years. With no previous inspection records, it is recommended to perform the next internal inspection immediately. In the event that the previous inspection records are found, the next internal inspection should be performed within ten (10) years of the previous internal inspection. MW1 is stenciled with a cleaning date of 13 May 2009; however, no inspection date was identified.

The recommended inspections and intervals are:

Routine In-Service Inspection by Facility Personnel: Monthly

External Inspection by Authorized Inspector: Five (5) Years; July 2020

External Inspection by Authorized Inspector w/ UTT: Fifteen (15) Years; July 2030

Internal Inspection by Authorized Inspector: Immediately or Ten (10) Years

A-1

APPENDIX A

CAD Drawings

OVERFLOW VENT (TYP. 4)

GROUNDING CABLE (TYP. 6)

SEISMIC ANCHOR (TYP. 13)

SPIRAL STAIRCASE

INTERMEDIATE PLATFORM

8'-0"

8'-0"

6'-0"

6'-0"

1-1

MW1

3"

MW1

MW3

MW2

N1 N2 N3

N4

N5

N6

N7

N9

N8

N10

N11

N12

N13

1-2 1-3

1-4 1-5

2-4 2-5 2-1

2-2

2-3

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

4-1 4-2 4-3

4-4 4-5

MATTYDALE, NEW YORK

HANCOCK ANG

SCALE:

NOT TO SCALE AUGUST 2015

REVISED BY:

EHY

TANK 2 (FACILITY 20005)

PROJECT MANAGER:

PROGRAM MANAGER:

BWL

LAG

GPS COORDINATES:

N 43° 6’ 9.76”

W 76° 5’ 53.75”

MANUFACTURER:

PITTSBURGH TANK & TOWER

DESIGN STANDARD:

API 650, 9TH EDITION

YEAR BUILT:

PRODUCT:

JET-A

PRODUCT SPECIFIC GRAVITY:

0.80

TANK DIAMETER:

27'-0"

TANK HEIGHT:

28'-3" (4 SHELL COURSES)

CAPACITY:

2,500 BBL

NOTES:

1. REFER TO TABLE B-1, SHELL PLATE ULTRASONIC

THICKNESS READINGS IN APPENDIX B FOR INDIVIDUAL

SHELL PLATE ULTRASONIC THICKNESS READINGS.

2. REFER TO TABLE B-3, NOZZLES AND APPURTENANCES,

FOR NOZZLE DATA.

SHELL LAYOUT

A1 OF A2

UPPER PLATFORM

W/ SPIRAL STAIRCASE

FIBERGLASS PATCH (TYP. 6)

PERIMETER VENT (TYP. 4)

N14

N15 N16

N17

H1

N19

N20

N21

N22

N18

5 6

11 12

MW4

30x14" 29x9"

13x25"

21x22"

16x27"

14x28"

MATTYDALE, NEW YORK

HANCOCK ANG

SCALE:

NOT TO SCALE AUGUST 2015

REVISED BY:

EHY

TANK 2 (FACILITY 20005)

PROJECT MANAGER:

PROGRAM MANAGER:

BWL

LAG

GPS COORDINATES:

N 43° 6’ 9.76”

W 76° 5’ 53.75”

MANUFACTURER:

PITTSBURGH TANK & TOWER

DESIGN STANDARD:

API 650, 9TH EDITION

YEAR BUILT:

PRODUCT:

JET-A

PRODUCT SPECIFIC GRAVITY:

0.80

TANK DIAMETER:

27'-0"

TANK HEIGHT:

28'-3" (4 SHELL COURSES)

CAPACITY:

2,500 BBL

NOTES:

1. REFER TO TABLE B-2, FIXED ROOF PLATE ULTRASONIC THICKNESS READINGS

IN APPENDIX B FOR INDIVIDUAL FIXED ROOF PLATE ULTRASONIC THICKNESS

READINGS.

2. REFER TO TABLE B-3, NOZZLES AND APPURTENANCES, FOR NOZZLE DATA.

FIXED ROOF LAYOUT

A2 OF A2

B-1

APPENDIX B

Tank Inspection Data

B-2

Table B-1: Shell Plate Ultrasonic Thickness Readings

Roof

SHELL

COURSE

PLATE 4-1 PLATE 4-2 PLATE 4-3 PLATE 4-4 PLATE 4-5

.252 .254 .255

.252 .254 .255

.253 .254 .251

AVG. .253

Circumferential Weld C4

SHELL

COURSE

PLATE 3-1 PLATE 3-2 PLATE 3-3 PLATE 3-4 PLATE 3-5

.256 .257 .256

.255 .256 .258

.257 .257 .259

AVG. .257

Circumferential Weld C3

SHELL

COURSE

PLATE 2-1 PLATE 2-2 PLATE 2-3 PLATE 2-4 PLATE 2-5

.258 .257 .257

.256 .258 .257

.257 .259 .257

AVG. .257

Circumferential Weld C2

SHELL

COURSE

PLATE 1-1 PLATE 1-2 PLATE 1-3 PLATE 1-4 PLATE 1-5

.255 .253 .253 .250 .249 .249 .250 .251 .250 .246 .247 .245 .257 .255 .257

.258 .255 .256 .253 .249 .251 .250 .252 .251 .247 .247 .248 .262 .257 .258

.254 .254 .254 .250 .251 .249 .251 .251 .249 .246 .247 .246 .258 .257 .258

AVG. .255 .250 .251 .247 .258

Circumferential Weld C1

Thicknesses represented in inches.

Average shell plate thickness:

Shell Course 1: 0.252” Shell Course 2: 0.257” Shell Course 3: 0.257” Shell Course 4: 0.253”

Refer to Drawing A-1 in Appendix A for plate numbers.

B-3

Table B-2: Fixed Roof Plate Ultrasonic Thickness Readings

PLATE 1 PLATE 2 PLATE 3 PLATE 4 PLATE 5

.192 .191 .192 .192 .183 .182 .181 .184 .187 .188

.186 .194 .184 .182 .186

.191 .189 .192 .190 .185 .185 .183 .184 .187 .188

AVG. .190 .192 .184 .183 .187

PLATE 6 PLATE 7 PLATE 8 PLATE 9 PLATE 10

.183 .180 .180 .180 .185 .187 .183 .181 .181 .182

.182 .181 .184 .181 .182

.182 .183 .183 .182 .185 .185 .183 .182 .179 .181

AVG. .182 .181 .185 .182 .181

PLATE 11 PLATE 12

.190 .189 .190 .187

.189 .189

.189 .187 .189 .187

AVG. .189 .188

Thicknesses represented in inches.

Average fixed roof plate thickness: 0.185” Refer to Drawing A-2 in Appendix A for plate numbers.

B-4

Table B-3: Nozzles and Appurtenances

NOZZLE

NOZZLE SIZE

(Diameter or

Width/Height)

REPAD

SHAPE

REPAD SIZE

(W X H)

REPAD

THICKNESS

NOZZLE

THICKNESS

H1 H2

NOZZLE LOCATION

(Measured circumferentially from Manway 1)

NOTES

MW1 36" A 78" x 92" .242 .473 2'-6" 4" 0' Manway 1

N1 10"

D 25" x 50" .247

.499 1'-0" - 5'-8" Product Receipt

N2 12" .475 1'-0" - 7'-3" Main Suction

N3 4" .344 1'-3" - 8'-4" Low Suction

N4 4" - - - - 27'-8" - 20'-10" AFFF

N5 1" - - - - 26'-11" - 24'-6" HHLA Sensor

N6 1" - - - - 6" - 24'-6" LLA Sensor

MW2 36" A 78" x 92" .248 .481 11'-4" 8'-4 1/4" 37'-9" Manway 2

MW3 36" A 78" x 92" .245 .476 3'-6" 3 3/4" 49'-0" Manway 3

N7 1" - - - - 23'-11 1/2" - 51'-0" HLA Sensor

N8 1" - - - - 22'-7 1/2" - 51'-0" HLA Sensor

N9 1" - - - - 24'-5 1/2" - 52'-1" HLCV Shut-off Chamber

N10 1" - - - - 24'-0" - 52'-1" Threaded Plug

N11 1" - - - - 22'-5 1/2" - 52'-1" HLCV Shut-off Chamber

N12 4" - - - - 27'-8" - 65'-6" AFFF

N13 1" - - - .164 2'-6" - 71'-2" Water Draw-Off

N14 3" - - - TH Roof IFR Anti-Rotation Cable

N15 8" - - - .536 Roof ATG/Gauging Hatch

N16 3" - - - TH Roof IFR Grounding Cable

MW4 30" - - - .273 Roof Manway 4

N17 4" B 12" .245 .217 Roof Blind Flange

H1 72" x 24" - - - .383 Roof Inspection Hatch

N18 4" B 9" .365 .306 Roof Tie-off

N19 12" - - - .352 Roof Center Vent

N20 4" B 9" .363 .296 Roof Tie-off

N21 3" - - - TH Roof IFR Grounding Cable

N22 3" - - - TH Roof IFR Anti-Rotation Cable

Thickness measurements are in inches.

H1 = C/L of pipe to edge of roof or chime.

H2 = Edge of tank or chime to nearest weld toe.

TH = Threaded Repad Shapes:

Refer to Drawings A-1 and A-2 in Appendix A for nozzle numbers and locations.

B-5

Table B-4: Coating Thickness Measurements

External Shell Coating Thickness

Average Standard Deviation Number of Readings Minimum Maximum

8.261 2.112 16 5.985 13.20

External Roof Coating Thickness

Average Standard Deviation Number of Readings Minimum Maximum

12.86 2.977 12 8.141 17.64

Thickness measurements are represented in mils.

C-1

APPENDIX C

API 653 Inspection Checklist

C-2

Foundation Inspection

Item Description Comments

1 Foundation description Tank rests on a concrete ring wall within a concrete containment dike lined with thick-mil coating.

2 Inspect for foundation damage or cracking.

No damage or cracking noted.

3 Evidence of bottom leakage or stains.

None noted.

4 List all significant cavities or erosion around the foundation.

None noted.

No erosion or cavities noted.

5 Inspect for vegetation under and around tank perimeter.

None noted.

Does tank have proper water runoff and drainage away from the tank?

Yes. Tank is elevated.

Is grade or other material covering the floor-to-shell weld or chime bottom plate?

Is any visual settlement noted around the tank perimeter?

What is the general condition of the dike area?

The containment dike is in good overall condition with approximately 118 linear feet of thick-mil coating cracking along the containment dike perimeter.

Notes:

The tank bottom is provided with leak detection, via four (4) perimeter tell-tale pipes.

The voltmeter and ammeter at the tank ICCP system rectifier read zero voltage and amperage during the time of inspection.

C-3

Shell Inspection

Item Description Comments

1 Inspect shell ladders, stairways, platforms, and walkways.

Acceptable.

2 Inspect shell for significant distortions, creases and/or buckling.

None noted.

3 Visually inspect shell for out-of-roundness.

Acceptable.

4 Inspect shell support welds for corrosion or damage.

None noted.

5 Inspect wind girder for corrosion or damage.

N/A – The tank is not equipped w/ a wind girder.

6 Inspect external shell for leaks or significant corrosion areas.

None noted.

7 Inspect exterior shell-to-bottom weld area for corrosion, defects or thinning of the chime bottom plate.

None noted.

Inspection was limited due to external coating.

8 Inspect shell coating for failure, peeling or fading.

Coating is in good overall condition with no indications of coating failure.

9 Inspect the internal shell for pitting, corrosion, rubbing or grooving.

N/A – External Inspection.

10 Inspect horizontal and vertical seams for weld or rivet joint details.

Acceptable.

11 Inspect shell overflow vents for corrosion and screening.

The tank is equipped with four (4) shell overflow vents.

12 Inspect shell for any lap patches. None noted.

13 Is the tank grounded?

Are the cables and clips in good condition?

Yes. The tank shell is equipped with six (6) grounding lugs and cables. All grounding cables are in good overall condition with no evidence of damage or detachment.

14 Does the tank have a legible data plate?

Yes. The tank is equipped with the original nameplate.

Notes:

C-4

Nozzle and Appurtenance Inspection

Item Description Comments

1 Inspect nozzle flanges and bolting for leaks and corrosion.

None Noted.

2 Inspect nozzles for pipe strain or misalignment.

No signs of visual pipe strain or misalignment.

3 Inspect valves for leaks or damage. The HLCV body and the product receipt, main suction, and low suction DB&B valves exhibit flaking, staining, and surface corrosion.

4 Do nozzles, which require pressure relief, have crossovers at the valve?

Yes. The product receipt and main suction lines are provided with thermal relief and crossover piping. Both TRVs are mounted horizontally with non-standard crossover piping.

Is Tank equipped with High Level Control Valve and High Level Alarms?

Yes. The tank is equipped with a HLCV at the product receipt and shell mounted LLA sensor, HLA sensor, HHLA sensor, and HLCV shut-off switch chamber.

6 Verify operation of gauging system.

• Manual Gauging Hatch?

• Type of Gauge?

• Type of Automatic Gauging System?

8” manual gauging hatch w/ a fully slotted stilling well.

N/A – The tank is not equipped with a liquid level gauge.

Cameron ATG system that is incorporated with the 8” manual gauging hatch.

7 Inspect manways, nozzles and attachments for signs of corrosion or defects.

Note Noted.

8 Do all nozzle reinforcement pads have tell-tale holes? Are they plugged?

Reinforcement pads for MW1, MW2, and MW3 are provided with plugged tell-tale holes.

9 Verify adequate reinforcement around nozzles and appurtenances.

Acceptable.

10 Verify adequate nozzle and appurtenances weld spacing.

Acceptable.

11 Verify interior nozzles have been back welded to the shell.

N/A – External Inspection

12 Check reinforcement pads for adequate fillet welds around pads.

Acceptable.

13 Visually inspect welds for defects on all nozzles and appurtenances.

Acceptable.

C-5

Item Description Comments

14 Does the inlet nozzle have a diffuser?

N/A – External Inspection

Notes:

Fixed Roof Inspection

Item Description Comments

1 Inspect fixed roof protective coating system.

Acceptable.

2 Inspect frangible joint / eave angle for corrosion, defects and coating failure.

Acceptable.

3 Inspect fixed roof for low spots and external corrosion.

None noted.

4 Conduct VT / UTT on roof nozzles and appurtenances.

External coating at the 4” blind flange exhibits flaking, staining, and surface corrosion.

5 Visual inspection of internal roof supports, girders, columns and bases.

N/A – External Inspection

6 Verify open roof vents have screens and covers.

Acceptable.

7 Verify handrails and tie-off supports are in good condition.

Acceptable.

8 Measure any significant bulges and creases in the roof plates.

None noted.

9 Do any roof nozzles or appurtenances have bolt-on type reinforcement pads?

None noted.

Notes:

The fixed roof is equipped with six (6) perimeter fiberglass patches.

The tank is provided with an aluminum honeycomb IFR. The IFR is provided with a secondary peripheral wiper seal.

D-1

APPENDIX D

Calculations

API-653 APPENDIX B SETTLEMENT EVALUATION

SHELL SETTELMENT SURVEY

File No

Report No

HFD-20005

Inspector

Anthony Chinn

Client

1150068-USACE

Tank No

2 (20005)

Date 7/22/2015

1st Crs Plt Spec

A 36M

Y

36000

E

29000000 -0.027

S - Max Permissible

0.027

28.25

0.006

0.010

0.036

0.000

-0.006

0.000

0.006

0.000

U

0.001

-0.011

0.031

-0.015

-0.006

0.000

0.006

-0.006

S

SAT

SAT

UNSAT

SAT

SAT

SAT

SAT

SAT

Results

The maximum measured out-of-plane deflection is 0.031 inches and the maximum allowable deflection is 0.027; therefore, the tank is not within API 653 acceptable limits. The allowable deflection is not accurately represented by the above analysis due to the small tank diameter and arc length. It is recommended to monitor the tank settlement in future inspections.

Notes:

U = Measured out-of-plane settlement in relation to a cosine curve, in feet S = Deflection, in feet, (out-of-plane distortion) L = Arc length between measurement points, in feet Y = Yield strength, in pounds per square inch (psi) E - Young's modulus, in pounds per square inch (psi) H = Tank height , in feet

S <= 11L^2Y/2EH

Feet

0.02High Point

0.06Low Point

0.04

Planar Tilt

Ft

Ft

Ft

L

10.60

0.48 In.

Point 1

Point 2

Point 3

Point 4

Point 5

Point 6

Point 7

Point 8

0.06

0.05

0.06

0.02

0.02

0.04

0.06

0.06

H (ft)

28.3

D (ft)

27.0

D (ft)

H (ft)

0.006 M

0.018 M

1.22 cm

API-653 APPENDIX B SETTLEMENT EVALUATION

SHELL SETTELMENT SURVEY

File No

Report No

HFD-20005

Inspector

Anthony Chinn

Client

1150068-USACE

Tank No

2 (20005)

Date 7/22/2015

1st Crs Plt Spec

A 36M

API653 Survey Calculation

0.021 0.021

0.042

0.063 0.063 0.063

0.052

0.063

0.021

0.00

0.01

0.02

0.03

0.04

0.05

0.06

0.07

4 5 6 7 8 1 2 3 4

Survey Point

D e p th

File No

Report No

HFD-20005

Inspector

Anthony Chinn

Client

1150068-USACE

Tank No

2 (20005)

Date 7/22/2015Tank Shell Minimum Thickness and Remaining Life Calculations

Temp. (°F)

Material

25.00

17.00

9.00

3.00

0.

0.

0.

0.

0.A 36M

A 36M

A 36M

A 36M

24900

24900

27400

27400

27 0.80 1.00G E 25.0

SE

tmin =

Where:

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

tmin = The calculated minimum acceptable shell thickness, in inches (must be greater than 0.1 inch (2.5 mm) for any course). The minimum acceptable shell thickness allowed by API-653 for tank size, in inches (mm) or an alternate tmin based on low pressure calulations (int and/or ext pressures) or nominal thickness minus design corrosion allowance.

D = Nominal diameter of tank, in feet (meters).

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

S = Maximum allowable stress, in psi. For welded tanks; use the smaller of 0.80Y of 0.429T for bottom and second course or the smaller of 0.88Y or 0.472T for all other courses. For riveted tanks; S = 21,000 psi. (145 MPa)

Y = Specified minimum yield strength of the plate, in psi; use 30,000 psi (200 MPa) if not known

(N/A for riveted tanks).

T = The smaller of the specified minimum tensile strength of the plate or 80k psi (550 MPa); use

55,000 psi (380 MPa) if not known (N/A for riveted tanks).

E = Original joint efficiency for the tank. For welded tanks; use API-653, Table 4-2 ; use E = 1.0 when evaluating the retirement thickness in a corroded plate, when away from welds or joints by at least the greater of one inch (250 mm) or twice the plate thickness. For riveted tanks; use E =

1.0 for shell plates greater than 6 inches (150 mm) away from rivets; use the value of E from API-

653 Table 2-1 when within 6 inches (150 mm) of rivets.

8.00

8.00

6.00

6.00

Course 1

Course 2

Course 3

Course 4

0.100

0.100

0.100

0.100

SHELL MINIMUM THICKNESS CALCULATIONS

2.6D(H-1)G tmin (in)S (psi)H (ft)Crs H (ft)

Fill Height (ft)D (ft)

File No

Report No

HFD-20005

Inspector

Anthony Chinn

Client

1150068-USACE

Tank No

2 (20005)

Date 7/22/2015Tank Shell Minimum Thickness and Remaining Life Calculations

Temp. (°F)

Nominal thicknesses are assumed based on actual thickness measurements.

tmin

0.100

0.100

0.100

0.1000.252

0.257

0.257

0.253 tact

0.250

0.250

0.250

0.250 tprev Ca

0.157

0.157

0.153

0.152

Cr

0.0000

RL

>40

0.0000

0.0000

0.0000

>40

>40

>40

Where:

Ca = Remaining corrosion allowance of the shell course under consideration, in inches (mm).

Cr = Corrosion rate of the shell course under consideration, in inches (mm) per year.

FHc = Calculated Fill Height = SEtact/2.6DG+1 (SEtact/4.6DG+.3) plus the total product height below the course of study, in feet (meters).

tact = Minimum thickness measurement of the shell course under consideration, as recorded at the time of inspection, in inches (mm).

tmin = minimum required thickness of shell course, at the maximum allowable fill height, in inches (mm) tprev = previous thickness measurement of shell course under consideration, as recorded at last inspection or nominal thickness if no previous thickness measurements, in inches (mm).

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

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

SHELL REMAINING LIFE CALCULATIONS

Ca = tact-tmin = Remaining Corrosion Allowance (inches (mm))

Cr = tprev-tact / Y = Corrosion Rate (inches (mm) per year)

RL = Ca / Cr = Remaining Life (years)

19Y = = Tank age (years)

Course 1

Course 2

Course 3

Course 4

Course FHc

112.73

122.95

142.39

146.44

D-6

Shell Service Life Evaluation

Shell Course

Previous Thickness

(in.)

Current Thickness

(in.)

Years since Prev.

N

(in. /yr.)

Min Thickness

(in.)

RCA

(mils)

Next External (years)

Next

UTM

(years)

1 0.250 0.252 19 0.0010 0.100 152 5 15

2 0.250 0.257 19 0.0010 0.100 157 5 15

3 0.250 0.257 19 0.0010 0.100 157 5 15

4 0.250 0.253 19 0.0010 0.100 153 5 15

N = Corrosion rate, if N is 0 then use the N of the next lower shell course RCA = Remaining Corrosion Allowance Interval to next formal external inspection = RCA/4 or 5 years maximum Interval to next Ultrasonic Thickness Measurements = RCA/2 or 15 years maximum

D-7

Nozzle Service Life Evaluation

See the following page for nozzle service life calculations. Component ID (Comp. Disc.) correlates with Table B-3, “Nozzles and Appurtenances” nozzle numbers. Only welded connections are included in the calculation. “tprev” is based on thicknesses from the previous API 653 inspection report or assumed nominal wall thicknesses for standard weight piping.

Nozzle/Pipe Remaining Life Calculations

Minimum Thickness Determinations:

a) The following pipe minimum thicknesses are based on the current in-house engineering standards, which take into consideration, pressures, structural integrity and localized corrosion allowance.

Size <=2" 3" 4" 6" 8" 10" 12" >12" t min

API-653 STORAGE TANK EVALUATION

0.080 0.100 0.100 0.125 0.125 0.156 0.188 0.188

Report No

HFD-20005

Inspector

Anthony Chinn

Client

1150068-USACE

Vessel

2 (20005)

Date

7/22/2015

Size t prev t act t min Ca Cr RL

Nozzle Remaining Life Calculations:

CML Comp. Disc.Age

MW1 0.500 0.473 0.188 0.285 0.00142 201001 3619 0.000

N1 0.500 0.499 0.156 0.343 0 >20002 1019 0.000

N2 0.500 0.475 0.188 0.287 0.00132 218003 1219 0.000

N3 0.337 0.344 0.100 0.244 0 >20004 419 0.000

MW2 0.500 0.481 0.188 0.293 0.00100 293005 3619 0.000

MW3 0.500 0.476 0.188 0.288 0.00126 228006 3619 0.000

N13 0.179 0.164 0.080 0.084 0.00079 106007 119 0.000

N15 0.500 0.536 0.125 0.411 0 >20008 819 0.000

MW4 0.375 0.273 0.188 0.085 0.00537 16009 3019 0.000

N17 0.237 0.217 0.100 0.117 0.00105 111010 419 0.000

N18 0.237 0.306 0.100 0.206 0 >20011 419 0.000

N19 0.375 0.352 0.188 0.164 0.00121 135012 1219 0.000

N20 0.237 0.296 0.100 0.196 0 >20013 419 0.000

MINIMUM THICKNESS, REMAINING LIFE, PRESSURE CALCULATIONS

API-653 ATMOSPHERIC STORAGE TANK FIXED ROOF EVALUATION

File No

Report No

HFD-20005

Inspector

Anthony Chinn

Client

1150068-USACE

Tank No

2 (20005)

Date

7/22/2015

DCa

Units

U.S.

Temp. °F

Where;

Ca = remaining corrosion allowance of the tank component under consideration, in inches (mm)

(t act - t min).

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

DCa = original design corrosion allowance of the tank component under consideration, in inches (mm)

KPa = kilopascal - (1 KPa = 1000 Pa) (1 KPa=0.146psi) unit of pressure. It is a measure of force per unit area. 1 pascal (Pa) = 1 N/m2 = 1 J/m3 = 1 kg/(m·s2) oz = unit of measurement, (weight, in ounces, per square inch), (16 oz per pound) psi = unit of measurement, (weight, in pounds, per square inch)

RL = estimated remaining life of the tank component under consideration, in years (Ca / Cr).

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

t min = minimum required thickness of tank component, at the design MAWP at the design temperature

(200°F for atm AST's), in inches (mm) (greater of psi/wt or 0.090" (2.3mm). Where tmin calculates to greater than tprev, tprev - 0.063" (1.6mm)).

t nom = design nominal thickness of tank component under consideration, in inches (mm).

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

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

wt = weight of plate per cubic inch.

wc = unit of measurement, (height, in inches, of water column bearing on 1 square inch area), (27.7 wc per pound)

Y = time span between thickness readings or age of the tank component if tnom is used for tprev, in years.

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

Y t prev

0.187 t act

0.185 t min

0.090

Cr

0.00011

RL

ROOF PLATES - REMAINING LIFE

Ca

0.095

E-1

APPENDIX E

Photographs

Unless otherwise noted, all photographs contained in this report were taken by POND. POND hereby grants permission to the U.S. Government and its contractors to publish/republish these photos.

E-2

Tank 2 (Facility 20005) Overview

Tank Nameplate

E-3

Overview of Concrete Ring Wall Overview of Tank Chime

Concrete Containment Dike Overview

E-4

Cracked Coating along the Containment Dike Perimeter

Transfer Piping

E-5

Plugged Tell-tale Hole at MW1 Reinforcement Pad

Overview of Product Receipt, Main Suction, and Low Suction

E-6

Product Receipt Coating Failure at Product Receipt DB&B Valve

Product Receipt TRV Mounted Horizontally with Non-Standard Crossover Piping

E-7

Coating Failure at Main Suction DB&B Valve Main Suction TRV Mounted Horizontally with

Non-Standard Crossover Piping

Coating Failure at Low Suction DB&B Valve

E-8

Typical Leak Detection Tell-Tale Pipe Typical Grounding Cable

LLA Sensor HHLA Sensor

E-9

HLCV Shut-off Switch Chamber HLA Sensor

Plugged Tell-tale Hole at MW3 Reinforcement Pad

E-10

Water Draw-off System

Plugged Tell-tale Hole at MW2 Reinforcement Pad

E-11

Fixed Roof Overview

8” ATG/Gauging Hatch

Typical Fixed Roof Perimeter Vent

E-12

Overview of Center Vent and 4” Blind Flange Coating Failure at 4” Blind Flange

Inspection Hatch MW4

E-13

Fiberglass Patches along Fixed Roof Perimeter

Overview of IFR

Overview of Secondary Peripheral Wiper Seal

E-14

CP Rectifier

CP Rectifier – Voltmeter CP Rectifier – Ammeter