Attachment K.2 - Barksdale-Fac 6350-RU2 (Tank 2)-FINAL-2017.pdf

US Army Corps of Engineers Omaha District

API 653 In-Service Final Inspection Report

Barksdale Air Force Base, Bossier City, LA Facility 6350.02

Tank 2

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

USACE POL-TCX

2 October 2017

API 653 In-Service Inspection Report Barksdale AFB, LA

TABLE OF CONTENTS

ACRONYMS AND ABBREVIATIONS

GENERAL SUMMARY

THIS INSPECTION

PREVIOUS INSPECTION DATES

RECOMMENDED FUTURE INSPECTION DATES

GENERAL TANK INFORMATION

A. GENERAL PROJECT INFORMATION

1. API 653 Inspection

2. Site Information

B. TANK INSPECTION COMMENTS

1. Tank Construction

2. Tank Foundation

3. Tank Shell

4. Tank Appurtenances

5. Tank Coating

6. Tank Piping System

7. Fire Protection System

8. Secondary Containment

C. FINDINGS AND RECOMMENDATIONS

1. MANDATORY REPAIRS per API 653, UFC 3-460-01, or AW 78-24-27 Standards

2. SIGNIFICANT FINDINGS per API 653, UFC 3-460-01, or AW 78-24-27 Standards

3. REPAIRS to Fully Comply with API 653, UFC 3-460-01, or AW 78-24-27 Standards

4. RECOMMENDED REPAIRS as Part of Regular Maintenance

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

SHELL SETTLEMENT SURVEY

SHELL THICKNESS CALCULATIONS

SHELL/ROOF ULTRASONIC THICKNESS MEASUREMENTS

TANK DRAWINGS

OSHA ACCESS STRUCTURE REPORT

APPENDIX B: API 653 CHECKLISTS FOR TANK INSPECTIONS

APPENDIX C: PHOTOGRAPHS

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

FAC Facility

HLA High Level Alarm

HLCV High Level Control Valve

HHLA High-High Level Alarm

LLA Low Level Alarm

LLLA Low-Low Level Alarm

MFL Magnetic Flux Leakage

MFE Magnetic Flux Exclusion

MT Magnetic Particle Testing

NA Not Applicable

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

UT Ultrasonic Testing

VT Visual Testing

GENERAL SUMMARY

Austin Brockenbrough & Associates, LLP (Brockenbrough) was retained by Omaha District USACE under Contract No. W9128F-12-D-0006 Delivery Order 00027 to perform API Standard 653 In-Service Inspections. As required by this task, Brockenbrough executed a tank inspection site visit to Barksdale AFB, located at Bossier City, Louisiana.

An API 653 In-Service (visual external) Inspection was conducted for Tank Facility No. 6350.02 (Tank 2) on July 25, 2017. This inspection was performed in accordance with API Standard 653, “Tank Inspection, Repair, Alteration, and Reconstruction,” and the referenced contract. The confined space between the internal floating roof and the fixed roof was not entered during the inspection. All observations made during this in-service (visual external) inspection were made from the exterior of the tank.

Tank Facility 6350.02 is a 32-foot and 9 ½-inch diameter by 39-foot and 4-inch tall, single wall, vertical, field erected tank with a nominal storage capacity of 4,400 barrels of jet fuel (F-24). The tank was fabricated by Woods Tank Inc. in 1998 per the manufacturer’s tank data plate. The tank was last repaired in 2011 by Cape per the tank repair data plate. The list of repairs included installation of a 4-inch and an 8-inch aluminum stilling well and other miscellaneous repairs. Secondary containment is provided by a concrete containment area with vertical concrete dike walls. The tank is built on an elevated concrete ringwall and has two leak detection ports. Since there are no as-built drawings of the tank available at the time of this inspection, the presence of a release prevention barrier could not be determined. Details of tank construction and appurtenances are included in Section ‘B’.

There are no mandatory repairs noted that need immediate attention. Additional noted deficiencies are discussed in more detail in Section ‘C’, and should be addressed in a timely manner. Photographs of the tank are included in Appendix ‘C’.

The next API Standard 653 In-Service (visual external) Inspection should be performed by an API 653 Inspector by July 2022. The last out-of-service inspection was performed in 2011. The report from that inspection indicated the next ultrasonic thickness inspection of the shell be performed by November 2021. However, the remaining life calculations indicate the API 653 recommended 15 year maximum interval is acceptable. Therefore, we recommend the next ultrasonic thickness inspection of the shell be performed by November 2026. While the current version of UFC 3-460-03 requires the next out-of-service inspection occur after 10 years, an upcoming revision allows the frequency to be extended as determined by a certified API 653 tank inspector. As the tank was inspected in 2011, we recommend the next API Standard 653 Out-Of-Service (internal and external) Inspection should be performed by November 2031. This inspection should include an external and internal inspection and include an examination of the tank bottom by magnetic flux leakage (MFL or MFE) technology and an ultrasonic thickness inspection of the tank shell. This inspection should include a thorough code compliance evaluation as well.

GENERAL TANK INFORMATION

ITEM DESCRIPTION

Owner U.S. Air Force

Location Barksdale Air Force Base

Facility Number Facility 6350.02

Tank Number Tank 2 (truck off-load)

State / Country Louisiana / U.S.A.

City Bossier City Inspection Date July 25, 2017

Tank Manufacturer Woods Tank Inc.

Design Standard API 650, 9th Edition

Date of Construction 1998 (Last repaired in 2011 per tank repair dataplate)

Tank Contents F-24

Tank Serial Number Unknown

Tank Diameter 32’ – 9 1/2”

Shell Height 39’ - 4”

Product Height 31’ – 9” (ATG Reading at the time of inspection)

Tank Capacity 4,400 barrel (Nominal capacity)

Foundation Elevated Concrete Ringwall

Construction

Bottom Lap-welded cone down plate

Shell (5) butt-welded shell courses

Floating Roof Honeycomb pan

Fixed Roof Lap-welded plates

Material

Bottom Carbon steel

Shell Carbon steel, A36 (Per Tank Data Plate)

Floating Roof Aluminum

Fixed Roof Carbon steel

Cathodic Protection Impressed current cathodic protection system

Interior Coating System Epoxy-Epoxy-Epoxy (assumed)

Exterior Coating System Epoxy-Epoxy-Polyurethane (assumed)

Level Gauging Shand & Jurs tape level gauge, Enraf ATG system

Overfill Protection ATG operated control valves Piping Receipt 10” Carbon steel Issue 14” Carbon steel Low Suction 4” Carbon steel

AFFF N/A N/A

Water Draw-Off 2” Carbon steel

Level Alarms High and High-High Level Alarms

Type of Internal Floating Roof Aluminum Honeycomb Floating Pan

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.

For Facility 6350.02 (Tank 2), an API Standard 653 In‐service (visual external) Inspection was performed. This inspection also included a foundation settlement survey.

2. Site Information

On July 25, 2017 Brockenbrough performed API 653 In‐Service (visual external) Inspection of Tank

Facility 6350.02 (Tank 2) located at Barksdale Air Force Base, Bossier City, Louisiana. The 2nd Bomb

Wing conducts the primary mission of Barksdale Air Force Base, with three squadrons of B-52H

Stratofortress bombers - the 11th Bomb Squadron, which is the training squadron, the 20th Bomb

Squadron and the 96th Bomb Squadron. Together they ensure the 2nd Bomb Wing provides flexible, responsive, global combat capability, autonomously or in concert with other forces, and trains all Air

Force Global Strike Command and Air Force Reserve B-52 crews.

B. TANK INSPECTION COMMENTS

1. Tank Construction

Tank Facility 6350.02 is a nominal 4,400 barrel, 32-foot and 9 ½-inch diameter by 39-foot and 4-inch tall, jet fuel (F-24), aboveground vertical storage tank. Per the information on the tank data plate, the tank was constructed in 1998 by Woods Tank Inc. to API 650, 9th Edition design standard. The data stenciled on the manhole indicated that the tank was last taken out-of-service, cleaned, and repaired in

November 2011. The list of repairs included installation of a 4-inch and an 8-inch aluminum stilling well and other miscellaneous repairs.

2. Tank Foundation

The tank rests on a raised concrete ringwall foundation. The foundation was visually evaluated during the inspection for broken concrete, spalling, cracks, and vegetation against the bottom of the tank. The bottom-to-foundation seal has completely failed and will need to be replaced. The tank has two 2-inch tell-tale ports/foundation drains, which suggests that a release prevention barrier (flexible membrane liner) underneath the tank may be present. These drain openings in the foundation were found to be leaking water. A shell settlement survey was performed during the inspection in accordance with

Appendix B of API Standard 653 and was found to be acceptable. Settlement results are listed in

Appendix A.

3. Tank Shell

The vertical and cylindrical shell consists of five butt‐welded courses. The exterior of the shell was visually inspected and evaluated for plumbness, roundness, peaking and banding. The coating was evaluated for deterioration.

4. Tank Appurtenances

a. Tank Roof

The coating system on the tank roof and appurtenances appeared to be in good condition with minor coating failure and corrosion observed on the roof, deck plate, inspection hatches, nozzle flanges, nuts, and bolts, etc. Evidence of water ponding was observed on the roof.

b. Gauging

The tank’s Enraf ATG includes a Vito water probe and is installed through a 12‐inch nozzle with an

8-inch aluminum stilling well on the tank roof. The tank also has a Shand & Jurs tape level gauge whose reading does not align with the Enraf ATG installed on the tank.

c. Level Alarms

There are no independent level alarms present as required by military criteria.

d. Stairs and Platforms

The tank’s fixed steel roof is accessible by a circumferential stairway mounted on the shell of the tank. There are several areas of coating failure and corrosion on the stairway and the platforms.

The bottom stair of the circumferential stairway is approximately 9 inches above the landing.

OSHA requires the rise to be consistent with the rest of the stairs.

e. Grounding and Bonding

There are four grounding cables connected to ground lugs welded to the tank shell.

5. Tank Coating

The interior coating system of the tank is assumed to be epoxy-epoxy-epoxy. The external coating system appeared to be a standard military coating system (epoxy-epoxy-polyurethane). Localized minor coating failure and corrosion was observed on the surface of the circumferential stairway, reinforcing plate weep holes, tank roof and roof appurtenances, etc.

6. Tank Piping System

Fuel is received through a 10‐inch carbon steel piping from the truck off-load and is issued through a

14-inch carbon steel piping to the hydrant systems. The existing thermal relief valve piping on the tank does not have testing tees and includes sight flow indicators.

7. Fire Protection System

There are fire hydrants noted within 300 feet of this tank. There is also an AFFF system that is used as fire suppression as well.

8. Secondary Containment

Secondary containment is provided by vertical concrete dike walls, and was evaluated during the inspection. There was minor cracking in the concrete slabs of the dike, and some minor debris was observed in the containment area. The containment is of sufficient size to contain a total tank loss.

C. FINDINGS AND RECOMMENDATIONS

Tank Facility 6350.02 was found to be in generally good condition. The tank is fully serviceable, with no mandatory deficiencies that require addressing prior to return to service. However, there were several items observed that are not in full compliance with federal, state, and local codes or military criteria.

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. No mandatory repairs are required to be performed.

2. SIGNIFICANT FINDINGS per API 653, UFC 3-460-01, or AW 78-24-27 Standards

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

a. Repair Coating System on Tank Roof, Roof Appurtenances, Stairway and Associated Piping

OBSERVATION: Localized minor coating failure and corrosion was observed on the surface of the circumferential stairway, tank roof and roof appurtenances, tank issue and receipt piping, etc.

CODE REFERENCE: UFC 3-460-01, Section 8-3.10, requires the exterior of fuel storage tanks and appurtenances to be coated.

RECOMMENDATION: Remove corrosion from all isolated areas of deterioration. Clean and prep all the areas that require coating repairs and apply a compatible coating system that meets military criteria. Corroded nuts and bolts should be removed and replaced with corrosion resistant nuts and bolts.

b. Repair Bottom-to-Foundation Seal

OBSERVATION: The tank bottom-to-foundation seal has minor failure in a few areas.

CODE REFERENCE: UFC 3-460-03, Section 8-4.10 B, requires the seal to be maintained in good working order to prevent corrosion of the underside of the tank bottom.

RECOMMENDATION: Repair the tank bottom-to-foundation seal.

c. Repair Hairline Cracking and Joint Sealant in Dike Containment Area

OBSERVATION: The are several locations where the secondary containment coating or the dike concrete slabs have cracked, and several locations where the joint sealant between slabs has failed.

Cracks in the concrete can create areas where a containment breach could occur without detection, as well as allow vegetation to grow.

CODE REFERENCE: UFC 3-460-01, paragraph 8-14.5 requires concrete dikes to resist and contain the full hydrostatic load when filled to capacity, which cracks in the dike may impede. All concrete surfaces in a diked enclosure should be sealed with a flexible, UV-resistant, fuel-resistant coating if required by state or local regulations.

RECOMMENDATION: Repair the cracked concrete areas and seal the exposed joint material to prevent the intrusion of water and degradation of the concrete dike.

d. Repair Hairline Cracks in Concrete Ringwall

OBSERVATION: There are a few hairline cracks in the concrete ringwall.

CODE REFERENCE: API 653, section 4.5.2.2 requires concrete ringwalls showing evidence of cracks or general deterioration to be repaired to prevent water from entering underneath the tank.

RECOMMENDATION: Repair hairline cracks in concrete ringwall to prevent further degradation and cracking of the tank foundation.

e. Repair Weep Holes on Shell Reinforcement Pads

OBSERVATION: The tell-tale holes on the shell reinforcement pads around the tank nozzles are creating rust streaks/stains on the tank shell.

CODE REFERENCE: API 650, sections 5.7.5.1 and 5.7.6.1 require tell-tales on all shell reinforcement pads for leak detection around the nozzles to be open to the atmosphere.

RECOMMENDATION: Remove the grease plugs and repair the corrosion of the tell-tale holes in the reinforcement pads. Install elbowed drain plug for leak detection.

f. Remove Mesh from Circulation and Overflow Vents

OBSERVATION: The roof mounted circulation and shell overflow vents contain fine mesh screens.

Smaller screen openings are more susceptible to clogging or freezing over which could result in tank failure, and inhibit proper ventilation.

CODE REFERENCE: API 650, section H.5.2.2 requires vent screens to have 1/2-inch openings.

RECOMMENDATION: Remove the screens on the vents.

g. Repair Joint Sealant in Ringwall Foundation

OBSERVATION: The joint sealant in the concrete ringwall foundation has failed in several areas.

CODE REFERENCE: UFC 3-460-03, Section 8-4.3.1 and 8-10.2.1 require all cracks to be cleaned and sealed with a fuel resistant sealant.

RECOMMENDATION: Repair the joint sealant in the concrete ringwall foundation and seal any gaps with a fuel resistant sealant or grout.

3. REPAIRS to Fully Comply with API 653, UFC 3-460-01, or AW 78-24-27 Standards

These items represent repairs and/or upgrades that could be performed to bring the tank into full compliance with current standards, but that do not represent potential risks to system operators, equipment integrity, or the adjacent environment. Our recommendations to perform, or not to perform these repairs and/or upgrades, take into consideration the cost of the repair, the operational benefit of the repairs, the age of the tank/system, operator safety, environmental risks, and equipment integrity.

a. Upgrade Thermal Relief System

OBSERVATION: The existing thermal relief valve piping does not have testing tees and includes sight flow indicators. Also, the coating system on the thermal relief piping and fittings has completely failed.

CODE REFERENCE: AW 78-24-27 requires the thermal relief piping to be equipped with isolation valves and testing tees. UFC 3-460-01, Section 9-3.5.1 does not allow sight flow indicators in thermal relief piping.

RECOMMENDATION: Provide testing tees and remove sight flow indicators from thermal relief piping on the tank issue and receipt piping. Remove and replace pipe coating system on the thermal relief piping.

b. Provide Low and Low-Low Level Alarms

OBSERVATION: This tank does not have low or low-low independent level alarms.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item l requires independent high-high, high, low, and low-low level alarms.

RECOMMENDATION: Install independent low and low-low level alarms.

4. RECOMMENDED REPAIRS 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. Provide NFPA Hazard Label

OBSERVATION: The tank is not labeled with a NFPA hazard warning label.

CODE REFERENCE: NFPA 30, paragraph 21.7.2.1 requires ASTs to be labeled in accordance with

NFPA 704.

RECOMMENDATION: Provide a new NFPA hazard warning label in accordance with NFPA 704.

b. Monitor Roof Drainage

OBSERVATION: There is evidence of water ponding at the perimeter roof vents. There is no sign currently of coating failure or corrosion.

CODE REFERENCE: DoD AST Standard Design, AW 78-24-27 requires roofs to be sloped to prevent water from ponding to prevent coating deterioration and plate corrosion.

RECOMMENDATION: Monitor the roof to ensure any water that may pond is not causing deterioration of the roof.

c. Monitor Ringwall Foundation Drainage

OBSERVATION: There is water leaking from the concrete ringwall foundation tell-tale ports under the tank. There is no sign currently of coating failure or corrosion as the cathodic protection appears to be functioning properly.

CODE REFERENCE: DoD AST Standard Design, AW 78-24-27 requires tanks to be significantly elevated to ensure that every portion of the tank bottom underside is elevated out of groundwater in order to reduce the risk of bottomside plate corrosion.

RECOMMENDATION: Monitor the cathodic protection system and the ringwall foundation tell-tale ports, and routinely drain the ports.

d. Monitor Dike Drainage

OBSERVATION: There appears to be excessive water accumulation underneath the tank. There is evidence of water ponding near the concrete ringwall foundation tell-tale ports. There is no sign currently of coating failure or corrosion as the cathodic protection appeared to be functioning properly.

CODE REFERENCE: DoD AST Standard Design, AW 78-24-27 requires tanks to be significantly elevated to ensure that every portion of the tank bottom underside is elevated out of groundwater in order to reduce the risk of bottomside plate corrosion.

RECOMMENDATION: Monitor the cathodic protection system and the ringwall foundation tell-tale ports, and routinely drain the ports.

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

SHELL SETTLEMENT SURVEY

Austin Brockenbrough & Associates, LLP Job No. 16-096.01

Location: Barksdale Air Force Base Date: 08/16/2017

Subject: Tank Fac 6350.02 - Shell Settlement Evaluation By: Andrew Swenck

API 653 Appendix B

Optimum cosine curve, B 2.2.4.e) Z = a + b x cos(theta + c)

Diameter (D) = 32.8 (ft)

Number of equally spaced data points (ft)= 8

L = Arc length between measurement points (ft) = 12.88

Tank Height (H) = 39.3 (ft)

* Z U S

0 13.875 0.00 0.01 0.01 0.04

1 13.875 0.00 0.03 0.03 0.04

2 14.000 0.13 0.09 -0.03 -0.06

3 14.000 0.13 0.15 0.03 0.08

4 14.125 0.25 0.18 -0.07 -0.10

5 14.000 0.13 0.15 0.03 0.02

6 13.875 0.00 0.09 0.09 0.13

7 14.000 0.13 0.03 -0.09 -0.14

8 13.875 0.00 0.01 0.01 0.07

Maximum out-of-plane deflection = 0.14

* = measured elevation

Z = calculated ridged body tilt (in)

U = out-of-plane settlement =

S = out-of-plane deflection z-y

Y = yield sterength of shell material (PSI) = 30,000

E = Youngs modulas of elasticity (lbf/in2) = 29*10^6

S allowable (in) (API 653 B.3.2.1) = (L^2*Y*11)/(2EH)*12 = 0.29 in

R^2 = (Syy - SSE) / Syy = 0.58

Evaluation by the Arc Length Method is required.

not >=0.9 therefore cosine curve is invalid.

Austin Brockenbrough & Associates, LLP Job No. 16-096.01

Location: Barksdale Air Force Base Date: 08/16/2017

Subject: Tank Fac 6350.02 - Shell Settlement Evaluation By: Andrew Swenck

API 653 B.2.2.5.1 Evaluation by Settlement Arc Length Method

10.5

Settlement arc length (ft), Sarc

Out of plate settlement at Point i (Si)

Allowable settlement at point i (Smax) = MIN[K*Sarc*(D/H)*(Y/E), 4]

Point Sarc (ft) Si (in) Smax

0 38.6 0.13 0.35 OK

3 25.8 0.06 0.23 OK

6 38.6 0.17 0.35 OK

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

Per B.3.2.2, K =

0.00

0.10

0.20

0.30

0.40

0.50

0 2 4 6 8

Si6

Measured Elevation

Si0 Si3

SHELL THICKNESS CALCULATIONS

The following shell thickness analysis is taken from a previous API 653 Internal Inspection Report prepared by

Robert and Company in November 2011. The analysis is included as a reference and should be used for informational purposes only.

Report No.: Barksdale 6350-2 File No.: 46

APPENDIX A

Engineering Calculations

1) Shell Minimum Thickness and Remaining Life Calculations

2) Roof Minimum Thickness and Remaining Life Calculations

3) Floor Minimum Thickness and Remaining Life Calculations

4) Nozzle Minimum Thickness and Remaining Life Calculations

5) Shell Out-of-Plane Settlement Survey Calculations

API-653 ATMOSPHERIC STORAGE TANK SHELL EVALUATION

Minimum Thickness and Remaining Life Calculations

File No. Report No. Client Inspector Tank No. Date

46 Barksdale 6350-2 Barksdale AFB Richard A. Laton Jr. 6350-2 11/14/2011

SHELL MINIMUM THICKNESS CALCULATIONS

tmin = 2.6D(H-1)G

SE

Where:

H = Height above the bottom of the course of study to the maximum liquid level height of the product, in feet. 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.

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

D = Nominal diameter of tank, in feet.

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 4-3 when within 6 inches (150 mm) of rivets.

D (ft) 32.81 G 0.84 E 1 Fill Ht (ft) 36.09

Course Material Crs H (ft) H (ft) S (psi) tmin (in)

Course 1 A36/M 8.000 36.09 24900 0.104

Course 2 A36/M 8.000 28.09 24900 0.100

Course 3 A36/M 8.000 20.09 27400 0.100

Course 4 A36/M 8.000 12.09 27400 0.100

Course 5 A36/M 7.000 4.09 27400 0.100

API-653 ATMOSPHERIC STORAGE TANK SHELL EVALUATION

Minimum Thickness and Remaining Life Calculations

SHELL REMAINING LIFE CALCULATIONS

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

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

RL = Ca / Cr = Remaining Life (years)

Y = 13 =Tank age (years)

Where:

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

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

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

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

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

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.

Course tprev tact tmin Ca Cr RL

Course 1 0.250 0.239 0.104 0.135 0.0008 >20

Course2 0.250 0.240 0.100 0.140 0.0008 >20

Course 3 0.250 0.244 0.100 0.144 0.0005 >20

Course 4 0.250 0.249 0.100 0.149 0.0001 >20

Course 5 0.250 0.255 0.100 0.155 <.0001 >20

API-653 ATMOSPHERIC STORAGE TANK FIXED ROOF EVALUATION

Minimum Thickness, Remaining Life, Pressure Calculations

Where;

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

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) 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 t min = minimum required thickness of tank component, at the design MAWP at the design temperature (200°F for atm AST's), in inches (greater of psi/wt or 0.090"). Where t min calculates to greater than t prev, t prev - 0.063" t nom = design nominal thickness of tank component under consideration, in inches 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 t yn = thickness of the tank component under consideration at the next inspection at twice the calculated corrosion rate, in inches (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 t nom is used for t prev, in years

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

ROOF PLATES - REMAINING LIFE

Y t prev t act t min Cr Ca RL

13 0.25 0.241 0.09 0.0007 0.151 >20

ROOF MAXIMUM ALLOWABLE INTERNAL PRESSURE

Material wt (psi) Yn t yn psi oz Wc KPa

Carbon Steel 0.2883 5 0.234 0.067 1.080 1.869 0.466

API-653 ATMOSPHERIC STORAGE TANK FLOOR EVALUATION

MINIMUM REMAINING THICKNESS (MRT) CALCULATIONS

Liner CP Protec.

50mil Liner

Leak Det. Ca Shell tmin Shell tnom

D H

Yes Yes Yes Yes 0.000 0.104 0.250 32.81 39.25

Where;

Ca = corrosion allowance, in inches.

MRT = minimum remaining thickness at the end of interval Or, in inches. This value must meet the requirements of Table 4.4 and sections 4.4.5.4 and 4.4.6.

Or = In-service interval of operation (years to next internal inspection) not to exceed that allowed by 6.4.2.

RTbc = minimum remaining thickness from bottom side corrosion after repairs, in inches.

RTip = minimum remaining thickness from internal corrosion after repairs, in inches.

StPr = maximum rate of corrosion not repaired on the top side. StPr = 0 for coated areas of the bottom.

The expected life of the floor must equal or exceed Or to use StPr = 0.

tmin = minimum allowable thickness in accordance with requirements of Table 4.4 and sections 4.4.5.4 and 4.4.6, in inches.

to = original (nominal) thickness of floor plate under consideration, in inches.

UPr = maximum rate of corrosion on the bottom side, in inches. To calculate the corrosion rate, use the minimum remaining thickness after repairs. Assume a linear rate based on the age of the tank.

UPr = 0 for areas that have effective cathodic protection.

D = nominal diameter of tank, in ft.

H =Height, in feet, from the bottom of the 1st shell course to the maximum allowable fill height.

GENERAL PLATES - AFTER INSPECTION / REPAIRS

Age to RTbc RTip UPr StPr Or MRT tmin Results

13 0.3125 0.302 0.302 0.0008 .0008 20 0.288 0.050 ACCEPTABLE

PLATES IN CRITICAL ZONE (3") - AFTER INSPECTION / REPAIRS

Age to RTbc RTip UPr StPr Or MRT tmin Results

13 0.3125 0.304 0.304 0.0007 0.0007 20 0.291 0.100 ACCEPTABLE

API-653 STORAGE TANK NOZZLE EVALUATION

Nozzle 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 0.070 0.100 0.100 0.125 0.156 0.156 0.188 0.188

Nozzle Remaining Life Calculations:

CML Age Description Size t prev t act t min Ca Cr RL

N1 13 Reference manway 36" 0.500 0.496 0.188 0.308 0.0003 >20

N2 13 Receipt 10" 0.594 0.566 0.156 0.410 0.0022 >20

N3 13 Issue 14" 0.594 0.560 0.188 0.372 0.0026 >20

N4 13 Pump out 4" 0.337 0.337 0.100 0.237 <.0001 >20

N5 13 Manway 36" 0.500 0.502 0.188 0.314 <.0001 >20

N6 13 Manway 36" 0.188 0.187 0.090 0.097 0.0001 >20

N7 13 Gauge well 14" 0.500 0.500 0.188 0.312 <.0001 >20

N8 13 Vent 12" 0.406 0.408 0.188 0.220 <.0001 >20

N/A - No Access

SHELL/ROOF ULTRASONIC THICKNESS MEASUREMENTS

The following shell and roof thickness analysis is taken from a previous API 653 Internal Inspection Report prepared by Robert and Company in November 2011. The analysis is included as a reference and should be used for informational purposes only.

APPENDIX B

Thickness Measurement Record

1) Shell UT Measurements

2) Roof UT Measurements

3) Floor UT Measurements

4) Nozzle UT Measurements

API-653 STORAGE TANK EVALUATION

AST Component Inspection Data

Component Thickness Measurements (in inches)

Note: Measurements at stairs taken above and below welds and at 1’ increments

CML Component Location tml-1 tml-2 tml-3 tml-4 tml-5 tml-6 tml-7 tml-8 tml-9 Minimum

1 Course 1 Plt1 0.250 0.266 0.256 0.245 0.246 0.244 0.271 0.259 0.246 0.244

2 Course 1 Plt2 0.254 0.245 0.248 0.246 0.260 0.248 0.251 0.251 0.250 0.245

3 Course 1 Plt3 0.258 0.267 0.244 0.243 0.240 0.246 0.259 0.241 0.244 0.240

4 Course 1 Plt4 0.251 0.261 0.258 0.245 0.246 0.239 0.251 0.248 0.254 0.239

5 Course 2 At Stairs 0.257 0.258 0.240 0.257 0.247 0.247 0.256 0.259 0.251 0.240

6 Course 3 At Stairs 0.251 0.259 0.265 0.262 0.247 0.247 0.261 0.245 0.244 0.244

7 Course 4 At Stairs 0.260 0.262 0.259 0.262 0.259 0.264 0.260 0.264 0.249 0.249

8 Course 5 At Stairs 0.256 0.263 0.265 0.268 0.261 0.260 0.255 0.262 0.255

9 Roof Plt1 0.259 0.260 0.270 0.261 0.260 0.259

10 Roof Plt2 0.257 0.261 0.252 0.255 0.251 0.251

11 Roof Plt3 0.255 0.251 0.250 0.255 0.253 0.250

12 Roof Plt4 0.257 0.260 0.258 0.261 0.254 0.254

13 Roof Plt5 0.253 0.260 0.255 0.258 0.257 0.253

14 Roof Plt6 0.254 0.253 0.254 0.261 0.256 0.253

15 Roof Plt7 0.249 0.250 0.250 0.255 0.249 0.249

16 Roof Plt8 0.244 0.253 0.241 0.254 0.260 0.241

17 Roof Plt9 0.250 0.244 0.243 0.253 0.248 0.243

18 Roof Plt10 0.249 0.249 0.250 0.249 0.245 0.245

19 Floor Plt1 0.318 0.307 0.320 0.312 0.309 0.307

20 Floor Plt2 0.323 0.331 0.322 0.323 0.325 0.322

21 Floor Plt3 0.318 0.309 0.310 0.322 0.331 0.309

22 Floor Plt4 0.328 0.323 0.331 0.342 0.340 0.323

23 Floor Plt5 0.331 0.339 0.336 0.337 0.340 0.331

24 Floor Plt6 0.310 0.314 0.319 0.321 0.327 0.310

25 Floor Plt7 0.319 0.334 0.318 0.323 0.328 0.318

26 Floor Plt8 0.318 0.312 0.309 0.324 0.328 0.309

27 Floor Plt9 0.313 0.314 0.318 0.309 0.321 0.309

28 Floor Plt10 0.310 0.307 0.302 0.318 0.314 0.302

API-653 STORAGE TANK EVALUATION

AST Component Inspection Data

File No Report No Client Inspector Tank No. Date

Critical Zone Thickness Measurements (in inches) The following CMLs were taken within 2” of the chime weld at 2’ intervals, 360°

CML Loc Thickness

1 0 ft 0.318

2 2 ft 0.309

3 4 ft 0.310

4 6 ft 0.328

5 8 ft 0.323

6 10 ft 0.331

7 12 ft 0.319

8 14 ft 0.334

9 16 ft 0.318

10 18 ft 0.318

11 20 ft 0.310

12 22 ft 0.313

13 24 ft 0.312

14 26 ft 0.314

15 28 ft 0.315

16 30 ft 0.309

17 32 ft 0.309

18 34 ft 0.320

19 36 ft 0.318

20 38 ft 0.310

21 40 ft 0.311

22 42 ft 0.310

23 44 ft 0.307

24 46 ft 0.309

25 48 ft 0.308

26 50 ft 0.304

CML Loc Thickness

27 52 ft 0.319

28 54 ft 0.334

29 56 ft 0.318

30 58 ft 0.310

31 60 ft 0.314

32 62 ft 0.319

33 64 ft 0.318

34 66 ft 0.309

35 68 ft 0.310

36 70 ft 0.323

37 72 ft 0.325

38 74 ft 0.323

39 76 ft 0.331

40 78 ft 0.324

41 80 ft 0.321

42 82 ft 0.322

43 84 ft 0.323

44 86 ft 0.320

45 88 ft 0.318

46 90 ft 0.311

47 92 ft 0.307

48 94 ft 0.320

49 96 ft 0.315

50 98 ft 0.313

51 100 ft 0.312

52 102 ft 0.312

API-653 STORAGE TANK NOZZLE EVALUATION

Nozzle Inspection Data

Nozzle Thickness Measurements (in inches)

Components with Vert. Axis: tml-1 N., tml-2 E., tml-3 S., tml-4 W. (Drawing N.)

Components with Horiz. Axis: tml-1 Top, tml-2 Side, tml-3 Btm., tml-4 Side (Clockwise)

CML Description Size Location tml-1 tml-2 tml-3 tml-4 Minimum x y

N1 Reference manway 36" 0 47" 0.504 0.502 0.496 0.505 0.496

N2 Receipt 10" 13' 27" 0.576 0.571 0.582 0.566 0.566

N3 Issue 14" 38'6" 28" 0.581 0.560 0.561 0.566 0.560

N4 Pump out 4" 41'8" 20" 0.337 0.341 0.348 0.342 0.337

N5 Manway 36" 51'5" 47" 0.507 0.508 0.510 0.502 0.502

N6 Manway 36" Roof 0.194 0.196 0.203 0.187 0.187

N7 Gauge well 14" Roof 0.509 0.500 0.503 0.508 0.500

N8 Vent 12" Roof 0.408 0.410 0.409 0.412 0.408

Reinforcement Plate Details

Noz ID Size Shape Thickness Weephole Acceptable

N1 68"x74" Tombstone 0.316 Yes Yes

N2 26"x24" Tombstone 0.25 Yes Yes

N3 36"x32" Tombstone 0.245 Yes Yes

N4 16"x12" Tombstone 0.244 Yes Yes

N5 68"x74" Tombstone 0.304 Yes Yes

N6 28" Round 0.362 NA Yes

TANK DRAWINGS

The following tank drawings are taken from a previous API 653 Internal Inspection Report prepared by Robert and

Company in November 2011. Drawings are included as a reference and should be used for informational purposes only. Locations of appurtenances, shell and roof plates, etc. are approximate.

APPENDIX D

Inspection Drawings

1) Shell Layout Drawing

2) Roof Layout Drawing

3) Floor Layout Drawing

OSHA ACCESS STRUCTURE REPORT

OSHA Stairway Data

Handrail Actual

(in)

OSHA Rq’d min (in)

Max (in)

Handrail Height 46 30 34 Step Width 24 22 NA Step Rise 8 NA NA

Bottom Step Rise 9

APPENDIX B: API 653 CHECKLISTS FOR TANK INSPECTIONS

UL SWRI

API Other

Protected

Type: Type:

Size: Date Installed:

CS End Conn: Size: 10" Material: CS End Conn: Size: 14"

Issue To:

Release Prevention Barrier

Overfill Protection / Level Alarms:

Independent High and High-High Level Alarms ATG operated control valve

Receipt Piping Configuration Issue Piping Configuration

Tank Piping

Secondary Containment

March 2011

Tank Specifications

Previous Tank Inspection Date:

Continuous Release Detection Monitoring

Type:

Date Installed:

Current Product:

32'-9 1/2" ø by 39'-4" tall

N/A

API 650, 9th edition

Liner with tell-tale ports

Inspection Date:

Design Std

Horizontal

Tank Inspector Name:

Inspector Certification Number:

Tank Outside Dimensions:

Nominal Capacity:

Useable Capacity:

Tank Construction and Configuration

Insulated

Coated

Plastic / Fiberglass

API 653 EXTERNAL INSPECTION CHECKLIST

Barksdale AFB, LAProject Site:Project Name:

Project Location:

Brockenbrough Job No.:

SPCC Mandated AST Inspections - Group 14 Various Locations

General Inspection Information

16-096.01 Submitted to:

Contract No.:

USACE - Omaha W9128F-12-D-0006

Tank Facility No.:

Local Tank ID No.:

July 25, 2017

6350.02

Tank Manufacturer:

Tank Construction Date:

Tank 2 Andrew C. Swenck

Vertical

Rectangular

Double Wall

Fire Resistant

Closed Top Dike

Change of Service:

Last Repair:

Tank Coatings:

Exterior Coating:

3-part epoxy (assumed)

Unknown

Interior Coating:

Double Bottom

Woods Tank Inc.

Concrete ringwall

28 1/2" tall

Level Alarms:

Material: Welded

Other:

F-24

4,400 bbl

N/A

Receipt From: Truck off-load

Welded

Hydrant Systems

56234

Secondary Containment, Overfill, and CRDM

Single Wall

Open Type Dike

Overfill Protection:

Unknown

(2) 2" tell-tale ports

Unknown

API 653 EXTERNAL INSPECTION CHECKLIST

Barksdale AFB, LAProject Site:Project Name: SPCC Mandated AST Inspections - Group 14

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Measure foundation levelness and bottom elevations (See Annex B) See tank settlement calculations

ITEM

C.1.1 Foundation

Tank Settlement

Cavities under foundation; vegetation against bottom of tank

Broken concrete, spalling, and cracks, especially under backup bars used in welding butt-welded annular rings under the shell Indications of bottom leakage at drain openings in ring, back of water-draw basins, and top surface of ring a) b)

C.1.1.1 Concrete Ring c)

Check for:

Minor hairline cracks, broken joint sealant

Minor ponding around ringwall d) a)

Check for:

Presence of crushed rock under the steel bottom which usually results in severe underside corrosion.

C.1.1.4 Rock

Run-off rainwater from shell draining away from the tank

e) Settlement around perimeter of tank

Leaching of oil which has left rock filler exposed indicating hydrocarbon leakage

Tank settlement into asphalt base

Review cathodic protection potential readings

Check for:

STATUS COMMENTS

Site drainage away from the tank, associated piping, and manifolds

Check for:

TASK

b)

Settlements into the base

C.1.1.5 Site Drainage

Proper operation of dike drainsb) C.1.1.6 Housekeeping

Buildup of trash, vegetation, and other inflammables

C.1.1.7 Cathodic Protection a)

Impressed current

Check for :C.1.1.3 Oiled Dirt or Sand

C.1.1.2 Asphalt Check for:

PIV recently replaced

Drains leaking water from under tank

C.1.2.1 External Visual Inspection

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

C.1.2.3 Riveted Shell Inspection

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Check for:

c)

Broken welds and corrosion damage (paint failure, pitting, corrosion, product buildup), especially where it occurs at tack-welded junction d) b)

Corrosion loss and wear on the rivets

Reinforcing pads welded to shell at supports

Leaks and identify the location by sketch or photo

C.1.2.4 Wind Girder (Floating Roof Tanks) a) c)

Grooving, corrosion, pitting, and coating failures

Minor coating failure

Check for:

Rivet and seam leaks on external surface

Check for:

Corrosion and thinning on plate and weld after cleaning the bottom angle area

Paint failures, pitting, and corrosion

e) Drawings of riveted seams if available. Otherwise, dimension and sketch (or photograph) the rivet pattern: no. of rows, rivet size, pitch length, butt-riveted or lap-riveted joints a)

Full fillet lap-welded vertical seams to increase joint efficiency

Pitting on support welds to shell, especially on shell plates

a) b)

c) Bottom-to-Foundation Seal b)

Sealant failure

C.1.2. Shells

Check for:

C.1.2.2 Internal (Floating Roof Tank)

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Shand & Jurs tape level gauge, Enraf ATG

Fire fighting system componentsb)

C.1.3.3 Autogauge System e)

Damage on welds on shell-mounted davit clips above valves 6 inches and larger Check for:

b)

COMMENTS

Cracks or signs of leakage on weld joint at nozzles, manholes, and reinforcing plates Shell plate dimpling around nozzles, caused by excessive pipe deflection c)

Check for:

ITEM TASK

C.1.3.2 Tank Piping Manifolds

a) Leaks at piping manifolds, flanges, and valves

C.1.3 Shell Appurtenances

Sealing of insulation around manholes and nozzles

e) Adequate manholes flange and cover thickness on mixer manholes c) d) g)

Anchored piping which would be hazardous to the tank shell or bottom connections during earth movement

Adequate thermal pressure relief of piping to the tank Proper operation of regulators for tanks with purge gas systems Leaks at sample connections and proper valve operation Damage and test the accuracy of temperature indicators h) d)

Check for:

f)

Flange leaks and leaks around bolting

a) C.1.3.1 Manholes and Nozzles

No testing tees and glass sight flow indicators

STATUS

a) Leaks on autogauge tape guide and lower sheave housing (floating swings)

b) Damage on autogauge head

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

c) Pass Fail N/A

Pass Fail N/A

Pass Fail N/A Pass Fail N/A

Pass Fail N/A

Freedom of movement of marker and float

Tape Level Gauge: 6' - 6" ATG: 6' - 6 15/16" i)

Bracing and supports for sample lines and equipment

C.1.3.3 Autogauge System c) d)

C.1.3.4 Shell-mounted Sample Station a)

Actual product level compared to the reading on the autogauge. Make note. (max. variation is 2 in.)

No more than 2 feet of tape are exposed at the end of the tape guide when the roof is in lowest position (floating roof tanks)

ITEM TASK

a) b)

Proper mounting flange and support Leakage

h) Condition of board and legibility of board-type autogauges b)

Check for:

Function of valves and plugging in sample lines, including drain or return-to-tank line Leaks in circulation pump and operating problems

Inspect condensate drain for presence of oil indicating leakage

C.1.3.5 Heater (Shell Manhole Mounted) C.1.3.6 Mixer Check for:

c) Condition of power lines and connections to mixer

2" coated steel pipe

STATUS COMMENTS

e) f) g)

Proper movement of tape by bumping the checker on autogauge headSize and construction material of the autogauge tape guide and make note (floating roof tanks) Proper movement of tape. Ask the operator if the tape tends to hang up during tank roof movement (floating roof tanks).

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

b) Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

ITEM TASK

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

C.1.3.8 Swing Lines: External Guide System

Check for leaks at threaded and flanged joints

C.1.3.9 Swing Lines: Identify Ballast Varying Need

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

Wear or fraying on all types of cable C.1.3.11 Swing Lines: Product Sample Comparison

Check for water or gravity differences that would indicate a leaking swing joint

Check for significant difference in stock specific gravity Check for:C.1.3.10 Swing Lines: Cable

Material and Condition a) Corrosion over entire length, for non-stainless steel cable

STATUS

Non-floating: Raise, then lower the swing line with the winch and check for cable lightness to confirm the swing line lowered properly

Indicator: Check that the indicator moves in the proper direction.

Floating swing line indicators show a lower level as cable is wound up on the winch. Non-floating swing line indicators show the opposite b) c)

COMMENTS

C.1.3.7 Swing Lines: Winch a) Operation

C.1.3.12 Swing Lines: Target

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

No access

Minor coating failure and corrosion

Ponding in several areas

ITEM TASK

C.1.4 Roofs

STATUS COMMENTS

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

C.1.4.1 Deck Plate Internal Corrosion

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

C.1.4.2 Deck Plate External Corrosion

Visually inspect for paint failure, holes, pitting, and corrosion product on the roof deck.

C.1.4.3 Roof Deck Drainage Look for indication of standing water.

(Significant sagging of fixed roof deck indicates potential rafter failure.

Large standing water areas on a floating roof indicate inadequate drainage design or, if to one side, a nonlevel roof with possible leaking pontoons.)

C.1.4.5 Gas Test Internal Floating Roof

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

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

STATUS COMMENTS

c) d) e) f) g)

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

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

Inspect visible metallic parts for corrosion and wear.

Inspect for openings in seals that would permit vapor emissions.

Inspect for protruding bolt or rivet heads against the shell.

Crack and leaks in the insulation weather coat where runoff rain water could penetrate the insulation

C.1.4.7 Floating Roof Seal a) Systems

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

b) Measure and record annular space at 30-ft spacing (minimum of four quadrants) around roof and record.

Measurements should be taken in directly opposite pairs.

1) ____________Opposite Pair 1; 2) ____________Opposite Pair 2

Wet insulation under the weather coat Corrosion on the roof plate and holes near the edge of the insulated area by removing small test sections of insulation

ITEM TASK

C.1.4.6 Roof Insulation Check for:

a) b) c)

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Check for:

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

ITEM TASK STATUS COMMENTS

41' - 7"

Operation of recoil reel and condition of rope on floating roof sample hatch and recoil systems

C.1.5 Roof Appurtenances

C.1.5.1 Sample Hatch

g) h)

Operation of system Presence and condition of protective coating or liner inside sample hatch (preventing rust from pipe getting into sample) on ultra clean stocks such as JP4 a) b) c) d) e) f)

Condition and functioning of sample hatch cover.

Condition of seal inside hatch cover on tanks governed by Air Quality Monitoring District rules Corrosion and plugging on thief and gauge hatch cover.

Marker and tab stating hold-off distance, where the sample hatch is used to reel gauge stock level Reinforcing pad where sample hatch pipe penetrates the roof deck.

C.1.4.7 Floating Roof Seal h) Systems i) j)

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

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

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

Seal slightly deteriorated

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

ITEM TASK STATUS

e)

Thinning, size of slots, and cover condition of the visible portion of the gauge well A hold-off distance marker and tab with hold-off distance (legible)

Welded to roof, minor corrosion on access covers

Hatch

Condition of roof guide for gauge well, particularly the condition of the rollers for grooving on floating roofs The distance from the gauge well pipe to the tank shell at different levels, if accessible

C.1.5.5 Autoguage: Float Well Cover a) a) b) c) d)

C.1.5.2 Gauge Well Check for:

COMMENTS

b) Corrosion on the tape guide's and float guide's wire anchors

Corrosion and missing bolts on the hatch

Check for:

b)

Inspect scaffold support for corrosion, wear and structural soundness.

C.1.5.3 Fixed Roof Scaffold Support

C.1.5.6 Sample Hatch (Internal Floating Roof) a) Overall conditions

Automatic sealing after sampling, when equipped with a fabric seal Proper operations when equipped with a recoil reel opening device b) c)

C.1.5.7 Roof-Mounted Vents (Internal Floating Roof)

C.1.5.4 Autogauge: Inspection Hatch & Guides (Fixed Roof) a)

Check for:

Check for:

C.1.5.8 Gauging Platform Drip Ring

Check condition of screens, locking and pivot pins.

On fixed roof tanks with…