Attachment K.6 FAC 50306 Inspection Report 2017.pdf

US Army Corps of Engineers Omaha District

API 653 In-Service Draft Inspection Report

Fort Rucker, Alabama Facility 50306

Tank 1

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

USACE POL-TCX

9 August 2017

API 653 In-Service Inspection Report Fort Rucker, Alabama

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 No. 0023 to perform API Standard 653 In-Service Inspections. As required by this task, Brockenbrough executed a tank inspection site visit to Fort Rucker, Hanchey Army Heliport, located in Dale County, Alabama. An API 653 In-Service (visual external) Inspection was conducted for Tank Facility No.

50306 (Tank 1) on June 20, 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 50306 is a 21’-3” diameter by 17’-6” tall, single wall, vertical, field erected tank with a nominal storage capacity of 1,000 barrels of jet fuel (F-24). Based on the nameplate data the tank was fabricated by Chicago Bridge & Iron Company in 1967. Secondary containment is provided by a concrete containment area with vertical concrete dike walls shared by adjacent Tank Facility 50305 (Tank 2), 50304 (Tank 3), and 50303 (Tank 4). The tank is built on a concrete slab on grade. Since there are no as-built drawings of the tank available at this time, the presence of a release prevention barrier could not be confirmed. The tank appears to be equipped with a sacrificial anode cathodic protection system. Details of the 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’.

There is a current work order to provide new coatings on the tank and associated piping.

The next API Standard 653 In-Service (visual external) Inspection should be performed by an API 653 Inspector by June 2022. The last out-of-service inspection was performed in 2011, however, a report was not available at the time of this inspection. A previous out-of-service inspection report dated February 2006 was available. The inspection schedule indicated herein is based on the 2006 report. If the 2011 inspection report details more stringent inspection intervals, it is recommended that they be considered along with the intervals in this report.

The next ultrasonic thickness inspection of the shell should be performed by February 2021. 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 2006, we recommend the next API Standard 653 Out-Of-Service (internal and external) Inspection should be performed by 2026. 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.

THIS INSPECTION

API In-Service (External) Inspection Date: 20 June 2017 Equipment Used: Laser Level Manufacturer: CST Berger Model Number: LHV Laser Level Calibration Method: Self Leveling Inspector(s): Daniel Caldwell

PREVIOUS INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: 2011 API In-Service (External) Inspection Date: Not Available

RECOMMENDED FUTURE INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: 2026 API Ultrasonic Thickness Inspection of Shell Date: 2021 API In-Service (External) Inspection Date: June 2022

It may be more cost effective to perform the internal inspection to coincide with the UT inspection. A reasonable compromise may be to perform both inspections, and the repairs recommended in the previous inspection report, in 2022.

Daniel R, “Jed” Caldwell, PE Mechanical Engineer API 653 Inspector No. 70855

GENERAL TANK INFORMATION

ITEM DESCRIPTION

Owner U.S. Army

Location Fort Rucker

Facility Number Facility 50306

Tank Number Tank 1

State / Country Alabama / U.S.A.

City Daleville

Inspection Date June 20, 2017

Tank Manufacturer Chicago Bridge and Iron Company

Design Standard API Std 650

Date of Construction 1967

Tank Contents Jet Fuel (F-24)

Tank Serial Number Unknown

Tank Diameter 21’-3”

Shell Height 17’-6”

Product Height 12’ – 1 10/16” (ATG Reading at the Time of Inspection)

Tank Capacity 1,000 barrels (Nominal Capacity)

Foundation Concrete Slab (per previous tank inspection report)

Construction

Bottom Lap-welded cone down bottom (Per previous tank inspection report)

Shell (2) butt-welded shell courses

Floating Roof Lap welded steel pan (Per previous tank inspection report)

Fixed Roof Self-supported, lap-welded, domed

Material

Bottom Carbon steel (Per previous tank inspection report)

Shell Carbon steel (Per previous tank inspection report)

Floating Roof Carbon steel (Per previous tank inspection report)

Fixed Roof Carbon steel (Per previous tank inspection report)

Cathodic Protection Sacrificial Anode Cathodic Protection System

Interior Coating System

Epoxy-Epoxy-Epoxy (assumed)

Exterior Coating System

Epoxy-Epoxy-Polyurethane (assumed)

Level Gauging Varec Tape Level Gauge; Enraf Automatic Tank Gauge (ATG)

Overfill Protection High Level Control Valve; Independent shell mounted High-high, High, and Low Level Alarms; a roof mounted High Level Alarm

Piping Receipt 6” nozzle (4” pipe) Stainless Steel

Issue 6” nozzle (4” pipe) Stainless Steel

Low Suction 3” Stainless Steel

Water Draw-Off 1” Stainless Steel

Level Alarms Independent shell mounted High-high, High, and Low Level Alarms; Roof mounted High Level Alarm

Type of Internal Floating Roof

Lap welded steel pan (Per previous tank inspection report)

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 50306, an API Standard 653 In‐service (visual external) Inspection was performed. This inspection also included a foundation settlement survey.

2. Site Information

On June 20, 2017 Brockenbrough performed an API 653 In‐Service (visual external) Inspection of Tank

Facility 50306 (Tank 1) located at Fort Rucker. Fort Rucker is a located in Dale County, Alabama, and is surrounded by the neighboring cities of Daleville, Ozark and Enterprise. Fort Rucker is a primary flight training base for Army Aviation and is home to the United States Army Aviation Center of Excellence

(USAACE) and the United States Army Aviation Museum.

B. TANK INSPECTION COMMENTS

1. Tank Construction

Tank Facility 50306 is a nominal 1,000-barrel, 21’-3” diameter by 17’-6” tall, F-24, aboveground vertical storage tank. Per the previous tank inspection report, the tank was constructed by Chicago

Bridge & Iron Company to API 650 design standard in 1967. Base personnel have strapping tables for determining tank volume.

2. Tank Foundation

The tank rests on a 6-inch high concrete slab. Since there were 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. The foundation was visually evaluated during the inspection for broken concrete, spalling, cracks, and vegetation against the bottom of the tank. The concrete slab was found to be in good condition with only a few minor hairline cracks. The bottom-to-foundation seal appears to have failed in several areas around the circumference of the tank bottom. 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 two butt‐welded courses. The exterior of the shell was visually inspected and evaluated for plumbness, roundness, peaking and banding. The coating was also evaluated for deterioration.

4. Tank Appurtenances

a. Tank Roof

The tank is constructed with a self-supported lap-welded domed roof. Isolated areas of coating failure and corrosion were observed on the roof, center vent, flanges, manholes, nozzles and nozzle reinforcing pads, nuts, and bolts. There was excessive mold and algae growth on the tank roof and roof appurtenances.

https://en.wikipedia.org/wiki/United_States_Army_Aviation_Branch https://en.wikipedia.org/wiki/United_States_Army_Aviation_Center_of_Excellence https://en.wikipedia.org/wiki/United_States_Army_Aviation_Museum

b. Venting

This tank features a roof center vent and five shell mounted perimeter circulation vent/overflows.

These vents provide adequate venting capacity based on the size of the tank.

c. Gauging

The tank’s Enraf ATG is installed through an 8-inch roof nozzle. The tank also has a Varec tape level gauge whose reading does not align with the Enraf ATG reading. There is a dedicated 8-inch sample gauging hatch with plug and reel mounted on the roof.

d. Level Alarms

The low and high level alarm chambers are mounted on the exterior of the tank shell, and there is an additional roof mounted high level alarm. The tank is equipped with low, high and high-high level alarms independent of the tank gauging system. An independent low-low level alarm is not present as is required by military criteria.

e. Stairs and Platforms

The tank’s steel roof is accessible by a circumferential stairway mounted on the shell of the tank.

The circumferential stairway is directly welded to the shell. The width and rise of the stairway steps and the height of the handrails appear to be in general compliance with OSHA criteria.

However, the bottom circumferential step is approximately 16 inches above the dike basin, and all the other step risers are approximately 9 inches. OSHA requires that the step risers be consistent.

f. Grounding and Bonding

There are two 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). Coating failure and corrosion were observed in multiple locations on the tank shell, tank bottom extension, tank roof, shell manhole covers, and bolts. There was extensive mold and algae growth observed on the tank roof, handrails, and the shell. As the tank is used to store oil and the interior is coated with epoxy, deterioration of the interior of the shell since the previous inspection was performed is extremely unlikely.

6. Tank Piping System

Fuel is received through a 6-inch nozzle and 4‐inch stainless steel piping from an adjacent Truck Off-load Station and is issued through a 6-inch nozzle and 4-inch stainless steel piping to the adjacent

Truck Fillstands.

7. Fire Protection System

There are several fire hydrants noted within 300 feet of this tank.

8. Secondary Containment

Secondary containment is provided by a concrete containment area with concrete curbs between 6 and

12 inches tall shared by adjacent Tank Facility 50305 (Tank 2), 50304 (Tank 3), and 50303 (Tank 4).

There are no intermediate dike walls present between the tank containment areas. The secondary containment was visually evaluated during the inspection. The containment is of sufficient size to contain a total tank loss plus one foot of freeboard.

C. FINDINGS AND RECOMMENDATIONS

Tank Facility 50306 was found to be in generally good condition. The tank is fully serviceable with no mandatory deficiencies that would require immediate removal of the tank from 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 and Tank Appurtenances

OBSERVATION: Extensive coating failure and minor corrosion were observed at multiple locations on the tank shell, tank roof, roof appurtenances, roof guardrail (at the base), deck platform and grating, circumferential stairway, tank bottom extension, and manhole covers and bolts.

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

RECOMMENDATION: Perform already scheduled repairs to repaint all tanks and piping under Work

Order RCK-H51-362.

b. Repair the Tank Bottom Extension and Bottom-to-Foundation Seal

OBSERVATION: The tank bottom-to-foundation seal has deteriorated and systematically failed.

Evidence of minor corrosion and coating failure at the tank bottom extension was observed. Some vegetation and organic growth was also observed at the sealant.

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: Remove the bottom-to-foundation seal. Prep and coat the tank bottom extension per AST standards and replace the tank bottom-to-foundation seal.

c. Repair Weep Holes on Shell Reinforcement Pads

OBSERVATION: The tell-tale holes on the shell reinforcement pads around the tank nozzles are plugged with a grease plug.

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 from the tell-tale holes in the reinforcement pads.

Install elbowed drain plug for leak detection.

d. Replace Tape Level Gauge System

OBSERVATION: The tape level gauge read 39 feet and 1 inches, while the ATG read 12 feet and 1

10/16 inches. The tape level gauge was inoperable.

CODE REFERENCE: API 653 External Inspection Checklist Item C.1.3.3.f) requires a maximum of

2 inches of variation between the actual product level compared to the reading on the autogauge.

RECOMMENDATION: Replace the tape level gauge system. Ensure new tape is attached to a weight resting on top of the floating pan and not directly attached to the pan or as recommended by the manufacturer.

e. Replace Level Control Valve

OBSERVATION: The 4-inch level control valve is constructed out of aluminum.

CODE REFERENCE: NFPA 30 paragraph 27.4.3 does not allow valves made of low melting point materials to be used within secondary containment areas. UFC 3-460-01 paragraph 3-6.7 prohibits use of aluminum valves in DoD Fuel Systems.

RECOMMENDATION: Replace the 4-inch aluminum control valve with a steel or ductile iron level control valve.

f. Provide Hold-Off Distance Marker at Sampling/Gauging Hatch

OBSERVATION: There are no hold-off distances painted or stenciled on or adjacent to the sampling/gauging hatches.

CODE REFERENCE: API 653 In-Service Checklist, C1.5.2b.

RECOMMENDATION: Provide a stencil indicating the hold-off distance and marking adjacent to or directly on the sample/gauging hatches.

g. Modify Bottom Stairway Steps

OBSERVATION: The circumferential stairway step rise is generally 9 inches. However, the bottom circumferential stairway step is approximately 16 inches above the dike basin.

CODE REFERENCE: OSHA 29 CFR 1910.24 (f) requires the rise of stairway steps to be uniform throughout its entire length, including at its foundation.

RECOMMENDATION: Provide a dike basin mounted step with a landing 9 inches below the bottom shell mounted stairway step.

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 on the tank receipt and issue piping have sight flow indicators and there are no testing tees present.

CODE REFERENCE: UFC 3-460-01, Section 9-3.5.1 does not allow sight flow indicators in thermal relief piping.

RECOMMENDATION: Modify and upgrade thermal relief piping to remove sight flow indicators and provide testing tees.

b. Provide Scaffold Supports

OBSERVATION: There are no scaffold cable supports present on the tank roof.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item ff requires two scaffold cable supports on the fixed roof in accordance with API 650.

RECOMMENDATION: Provide two scaffold cable supports in accordance with API 650.

c. Provide Low-low Level Alarm

OBSERVATION: The tank has low, high, and high-high levels switches, but does not have a low-low level switch.

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

RECOMMENDATION: Modify low level alarm shell mounted chamber and provide low-low level alarm.

d. Provide Intermediate Containment Between Tanks

OBSERVATION: There is no intermediate containment between the four tanks – Facilities 50303, 50304, 50305 and 50306. The existing dike wall heights are between 6” and 12” high.

CODE REFERENCE: NFPA 30 Section 22.11.2.6 requires that each diked area containing two or more tanks shall be subdivided, preferably by drainage channels or at least by intermediate dikes, in order to prevent minor spills from a tank from endangering adjacent tanks within the diked area.

Intermediate dike walls are required to be a minimum of 18” high.

RECOMMENDATION: An 18” intermediate dike wall is not feasible due to the short height of the existing dike walls. Provide an intermediate drainage channel separating Tanks 3 and 4 from Tanks

1 and 2. An intermediate dike wall

e. Provide Circumferential Stair Landing

OBSERVATION: There is no circumferential stairway landing for maintaining the high-level alarm chamber.

CODE REFERENCE: DoD Standard Design AW 78-24-27 requires new storage tank designs to include a circumferential stairway landing for maintaining shell-mounted level alarms.

RECOMMENDATION: Provide a circumferential stairway landing for maintaining the shell-mounted level alarms.

f. Upgrade Low Suction Piping

OBSERVATION: The low suction piping has a ball valve at the tank skin and is not hard piped to the main suction.

CODE REFERENCE: UFC 3-460-01, Paragraph 4-6.8.4 requires double block and bleed type valves on all tank shell connections. DOD Standard Design AW 78-24-27 requires the low suction line to be connected to the issue line for complete draining of the tank contents via the same pumps used to issue product.

RECOMMENDATION: Provide a double block and bleed isolation valve at the skin of the tank per DOD

Standard Design AW 78-24-27. However, due to the location of the low suction nozzle relative to the main suction and the proper functionality of the tank operations, we do not recommend any piping modifications at this time.

g. Upgrade Water Draw-off Piping

OBSERVATION: The water draw-off nozzle is one inch and has a ball valve at the tank skin.

CODE REFERENCE: UFC 3-460-01, Paragraph 4-6.8.4 requires double block and bleed type valves on all tank shell connections. DOD Standard Design AW 78-24-27 requires the water draw-off nozzle to be two inches in diameter so that a double block and bleed valve can be installed.

RECOMMENDATION: Replace the one inch diameter Water Draw-off nozzle with a two inch nozzle and provide a two inch double block and bleed at the tank skin per DOD Standard Design AW 78-

24-27.

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. Remove Mold and Algae

OBSERVATION: There is mold and algae growing on the tank roof, shell, and appurtenances. The mold and algae growth may cause and/or accelerate degradation of the exterior coating system.

CODE REFERENCE: UFC 3-460-01 paragraph 8-3.10 requires the exterior of the tank to be coated.

RECOMMENDATION: Power wash the exterior of the tank and apply an algae and mold inhibitor on a regular basis.

b. 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.

c. Remove Debris within the Dike Area

OBSERVATION: There is buildup of organic debris in the containment dike area which may lead to deterioration of the containment area and coating system over time.

CODE REFERENCE: API 653 In-Service Inspection Checklist, C.1.1.6 requires all containment areas to be free of trash, vegetation, and inflammables.

RECOMMENDATION: Remove debris and perform regular maintenance to prevent deterioration of the containment slab.

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

SHELL SETTLEMENT SURVEY

Austin Brockenbrough & Associates, L.L.P.

Job No. 16-088.01 Location: Fort Rucker

Date: 08/02/2017 Subject: Tank 50306 Shell Settlement Evaluation By: Daniel Caldwell

API 653 Appendix B Optimum cosine curve, B 2.2.4.e)

Z = a + b x cos(theta + c)

Diameter (D) = 21.25 (ft)

Number of equally spaced data points (ft)= 8 L = Arc length between measurement points (ft) = 8.34 Tank Height (H) = 17.50 (ft)

Height of

Weld * Z U S

0 46.375 0.00 0.02 0.02 0.05

1 46.375 0.00 0.09 0.09 0.20

2 46.875 0.50 0.26 -0.24 -0.13

3 47.125 0.75 0.43 -0.32 -0.20

4 46.875 0.50 0.50 0.00 0.01

5 46.500 0.13 0.43 0.31 0.17

6 46.375 0.00 0.26 0.26 0.19

7 46.625 0.25 0.09 -0.16 -0.30

8 46.375 0.00 0.02 0.02 0.15

Maximum out-of-plane deflection = 0.30

* = measured elevation

*HI (Height of Instrument) Z = calculated rigid body tilt (in)

U = out-of-plane settlement = S = out-of-plane deflection = z-y

Y = yield strength of shell material (PSI) = 30,000 E = Youngs modulus of elasticity (lbf/in2) = 2.90E+07 S allowable (in) (API 653 B.3.2.1) = (L^2*Y*11)/(2EH)*12 = 0.27 in

R^2 =(Syy - SSE)/Syy = 0.44 not >=0.9 therefore cosine curve is invalid.

Evaluation by the Arc Length Method described in API 653 B.2.2.5.1 is required.

Austin Brockenbrough & Associates, L.L.P.

Job No. 16-088.01 Location: Fort Rucker

Date: 08/02/2017 Subject: Tank 50306 Shell Settlement Evaluation By: Daniel Caldwell

API 653 B.2.2.5.1 Evaluation by Settlement Arc Length Method

Per B.3.2.2, K = 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 33.4 0.375 0.44 Si < Smax → OK

6 33.4 0.375 0.44 Si < Smax → OK

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

-0.20

0.00

0.20

0.40

0.60

0.80

0 2 4 6 8 10

Measured Elevation (in)

Si6 Si0

SHELL THICKNESS CALCULATIONS

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

HMT Inspection in February of 2006. The analysis is included as a reference and should be used for informational purposes only.

API 653 Out-of-Service Inspection Report for U.S. Army Tank No. 1

Fort Rucker, AL

HMT Inspection

February 11-15, 2006

APIRPTSE.DOT REV 1 272-70889/Tank 1 (Hanchey)r2 3/8/2006 7:46:00 AM

4.3.2 SHELL THICKNESS CALCULATIONS

The minimum acceptable shell plate thickness for tanks with a diameter equal to or less than two-hundred (200) feet is calculated as follows (Ref. API 653, Para. 4.3.3.1):

SE

DGHt )1(6.2 min

Where:

S = See Table = Allowable Stress (psi) D = 21.25 = Nominal Diameter of Tank (ft.)

G = 1.00 = Highest Specific Gravity of Contents H = See Table = Product Height (ft.)

E = See Table = Joint Efficiency

Course

Course Height

(in.)

Product Height

(ft.)

Allowable Stress (psi)

Joint Efficiency

Average Thickness

(in.)

Required Thickness

(in.)

1 107.5 17.50 23,600 0.85 0.202 0.100 2 102.5 8.54 23,600 0.85 0.189 0.100

Shell thickness calculations indicate the safe fill height of 17.50 feet can be utilized with product specific gravities up to 1.0 (ref. API 653, Para. 4.3.3.1). For products with a specific gravity over 1.0, additional calculations should be performed (ref. API 653, Para.

4.3.3.1). These calculations do not take into account operational restrictions from such items as shell vents, high-level alarms or owner/operator-imposed safe fill restrictions.

SHELL/ROOF ULTRASONIC THICKNESS MEASUREMENTS

The following shell and roof thickness analysis is taken from a previous API 653 Internal Inspection Report prepared by HMT Inspection in February of 2006. The analysis is included as a reference and should be used for informational purposes only.

U.S. Army

TABLE C

SHELL READINGS

(in inches)

Course 1 Plate No.

Reading

Reading

Reading

Reading

Reading

Reading

Reading

Reading

Reading

1 0.202 0.205 0.206 0.207 0.210 0.211 0.204 0.210 0.210 2 0.194 0.197 0.210 0.196 0.196 0.197 0.194 0.194 0.196 3 0.197 0.198 0.196 0.197 0.200 0.209 0.188 0.196 0.195 4 0.199 0.207 0.203 0.205 0.210 0.209 0.204 0.210 0.207

Min: 0.188 Avg: 0.202

Course 2 Plate No.

Reading

Reading

Reading

Reading

Reading

Reading

Reading

Reading

Reading

1 0.187 0.200 0.191 0.200 0.187 0.190 0.191 0.195 0.193 2 0.175 0.183 0.179 0.184 0.173 0.186 0.190 0.176 0.183 3 0.191 0.195 0.198 0.200 0.185 0.187 0.190 0.195 0.192

Min: 0.173 Avg: 0.189

U.S. Army

TABLE C (CONT’D)

SHELL READINGS

(in inches)

Readings taken every 3 feet, 2 inches above the shell-to-bottom weld Ft. Reading 3 0.185 6 0.189 9 0.181 12 0.187 15 0.194 18 0.190 21 0.189 24 0.187 27 0.185 30 0.190 33 0.192 36 0.191 39 0.189 42 0.187 45 0.189 48 0.190 51 0.192 54 0.191 57 0.194 60 0193 63 0.195 66 0.189

U.S. Army

TABLE D

FIXED ROOF READINGS

PLATE

NO.

Reading

Reading

Reading

Reading

Reading

1 0.192 0.194 0.193 0.189 0.191 2 0.192 0.190 0.194 0.189 0.190 3 0.188 0.187 0.186 0.184 0.189 4 0.190 0.191 0.189 0.185 0.188 5 0.188 0.187 0.186 0.182 0.184 6 0.190 0.189 0.191 0.188 0.192

Min: 0.182 Avg: 0.189

U.S. Army

TABLE E

FLOATING ROOF READINGS

PLATE

NO.

Reading

Reading

Reading

Reading

Reading

1 0.187 0.190 0.186 0.183 0.189 2 0.193 0.200 0.192 0.196 0.194 3 0.189 0.187 0.185 0.190 0.191 4 0.193 0.194 0.192 0.191 0.189 5 0.195 0.190 0.191 0.187 0.188 6 0.189 0.193 0.194 0.195 0.196 7 0.187 0.185 0.186 0.188 0.189 8 0.191 0.193 0.200 0.201 0.189

Min: 0.183 Avg: 0.191

TANK DRAWINGS

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

Inspection in February of 2006. Drawings are included as a reference and should be used for informational purposes only. Locations of appurtenances, shell and roof plates, etc. are approximate.

4.4.2 NOZZLE AND APPURTENANCE TABLE Page 23 of 58

Reinforcing Plate

Item

Description Pipe Size (in.)

Station

(ft.)

CL

Elev.

Width

Height

Thick

Shape

Neck

(in.)

Flng Thick (in.)

Cover Thick (in.)

Tell-tale

Weld Space

Comments

A Manway 24 0.0 29.5 65 54 0.393 A 0.465 0.453 0.493 Yes 2.5 TTP, IWS B Automatic Gauge -- 2.8 -- -- -- -- -- -- -- -- -- -- Varec Fig. 2500

Model B C Start of Stairway -- 5.8 -- -- -- -- -- -- -- -- -- -- D Conduit -- 16.3 -- -- -- -- -- -- -- -- -- -- E Coupling 1.25 17 C2 -- -- -- -- -- -- -- -- C2 Level Alarm F Coupling 1.25 17 C2 -- -- -- -- -- -- -- -- C2 Level Alarm G Coupling 1.25 17.45 16 -- -- -- -- -- -- -- -- 15 Level Alarm H Coupling 1.25 17.45 44 -- -- -- -- -- -- -- -- 43 Level Alarm I Coupling 1 17.9 6.5 -- -- -- -- -- -- -- -- 5.5 J Coupling 1.25 18.6 C2 -- -- -- -- -- -- -- -- C2 K Nozzle 3 19.45 8 14 10.5 0.242 C 0.295 0.884 -- Yes 2 TTP, IWS L End of Stairway -- 24.6 -- -- -- -- -- -- -- -- -- -- M Nozzle 6 25 17.5 20 15.5 0.272 C 0.435 0.980 -- Yes 9.5 Mechanical Plug N Conduit 1.25 25.4 -- -- -- -- -- -- -- -- -- -- O Ground -- 26.2 3 -- -- -- -- -- -- -- -- 2.5 P Nozzle 3 33.15 C2 -- -- -- -- N/A -- -- -- C2 No Repad, Overflow Port Q Nozzle 16x8 36.2 4.5 46 14 0.317 K 0.512 0.603 0.377 Yes Flush TTP R Nozzle 3 49.7 C2 -- -- -- -- N/A -- -- -- C2 No Repad, Overflow Port S Nozzle 6 58.4 18 20 15.5 0.243 C 0.435 1.002 -- Yes 9 Mechanical Plug T Ground -- 59 3 -- -- -- -- -- -- -- -- 2.5 U Nozzle 3 66.75 C2 -- -- -- -- N/A -- -- -- C2 No Repad, Overflow Port The stations are measured circumferentially counterclockwise from Manway A.

Shape

IWS= Insufficient Weld Space VERTICAL WELD SEAM LOCATIONS: (Measured in feet circumferentially counterclockwise from Manway A)

1) 10.97 2) 33.33 3) 39.17 4) 55.6 5) 6) 7) 8) 9) 10) 11) VERTICAL WELD OFFSET FOR COURSES 2, 3, 4, etc.

2) 3.5 3) 4) 5) 6) 7) 8) 9)

Total Strapped Circumference = 66.88 ft.

U.S. Army

4.5.2 FIXED ROOF NOZZLE TABLE

Item

Description

Pipe Size (in.)

Location Plate No.

Neck

Comments

A Gauge Wire 1.75 2 -- Coupling B Center Vent 24 3 / 4 0.248 C Manway 24 4 0.195 D Gauge Pole 8 4 0.312 W/Inst Borton Model

TS10-1319A

OSHA ACCESS STRUCTURE REPORT

OSHA Stairway Data

Handrail Actual

(in)

OSHA Rq’d min (in) max (in)

Handrail Height 31 30 34 Step Width 30 22 NA Step Rise 9 NA NA

Bottom Step Rise 16 8 8

APPENDIX B: API 653 CHECKLISTS FOR TANK INSPECTIONS

UL SWRI

API Other

Protected

Type: Type:

Size: Date Installed:

SS End Conn: Size: 4" Material: SS End Conn: Size: 4"

Issue To:

Nominal Capacity:

Useable Capacity:

Current Product: N/AHorton Tank Chicago Bridge & Iron

Truck fillstandsReceipt From: Tank truck off-load

Jeff King

Vertical

Rectangular

Double Wall

Fire Resistant

Closed Top Dike

Change of Service:

Last Repair:

Tank Coatings:

Exterior Coating:

3-part epoxy (assumed)

Unknown

Tank Facility No.:

Local Tank ID No.:

6/20/2017

50306

Tank Manufacturer:

Tank Construction Date:

Tank 1

F-24 jet fuel

1,000 BBL

1,106 BBL

Single Wall

Open Type Dike

Release Prevention BarrierSecondary Containment

Issue Piping Configuration

Tank Piping

Unknown

Date Installed:

API 653 EXTERNAL INSPECTION CHECKLIST

Fort Rucker, ALProject Site:Project Name:

Project Location:

Brockenbrough Job No.:

Ft. Rucker Tank Inspections Hanchey Airfield, Ft. Rucker

General Inspection Information

16-088.01 Submitted to:

Contract No.:

USACE POL - TCX

W9128F-12-D-0006

2012Previous Tank Inspection Date:

Interior Coating:

54102

Horizontal

Inspection Date:

Design Std

Tank Specifications

Tank Inspector Name:

Inspector Certification Number:

Insulated

Coated

Plastic / Fiberglass

Other:Double Bottom

Tank Construction and Configuration

Concrete dike

Level Alarms:

Material: Welded

Unknown

Overfill Protection:

Tank Outside Dimensions:

Continuous Release Detection Monitoring

Type:

Secondary Containment, Overfill, and CRDM

Overfill Protection / Level Alarms:

Low, high, & high-high independent level alarms High level control valve on receipt piping

Receipt Piping Configuration

21'-3"ø x 17'-6" tall

Welded

API 653 EXTERNAL INSPECTION CHECKLIST

Fort Rucker, ALProject Site:Project Name: Ft. Rucker Tank Inspections

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 c)

Review cathodic protection potential readings

Check for:

b)

C.1.1.4 Rock Check for:

b) a)

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

Settlements into the base

Check for:

Measure foundation levelness and bottom elevations (See Annex B) See level survey results

C.1.1 Foundation

C.1.1.1 Concrete Ring

STATUS COMMENTSTASK

Tank Settlement b)

Run-off rainwater from shell draining away from the tank

Check for :C.1.1.3 Oiled Dirt or Sand e)

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) d) a)

Settlement around perimeter of tank

ITEM

Sacrificial anodesC.1.1.7 Cathodic Protection

Check for:

C.1.1.5 Site Drainage

Check for:

Proper operation of dike drains C.1.1.6 Housekeeping

Buildup of trash, vegetation, and other inflammables

Tank settlement into asphalt base

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

C.1.1.2 Asphalt

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

C.1.2.1 External Visual Inspection

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A No access

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

COMMENTS

Rivet and seam leaks on external surface

Check for:

c) Bottom-to-Foundation Seal

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 b)

a) b)

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

The foundation seal is dry rotted and starting to fail

Leaks and identify the location by sketch or photo c)

C.1.2. Shells

ITEM TASK

Corrosion loss and wear on the rivets

Pitting on support welds to shell, especially on shell plates

STATUS

Check for:

Check for:

Exterior coating system is failing. The coating is peeling with minor corrosion on roof and tank shells

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

Check for:

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

Paint failures, pitting, and corrosion

Grooving, corrosion, pitting, and coating failures

C.1.2.2 Internal (Floating Roof Tank) c) b)

Minor corrosion on and around tank bottom extension. Mold and algae on tank

Reinforcing pads welded to shell at supports

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

Mechanical tape gauge is inoperable

C.1.3.3 Autogauge System

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

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

b) Damage on autogauge head

ITEM

a)

Fire fighting system componentsb) c) d) e) f) h) g)

C.1.3 Shell Appurtenances

STATUS

Shell plate dimpling around nozzles, caused by excessive pipe deflection

TASK

a) b)

Cracks or signs of leakage on weld joint at nozzles, manholes, and reinforcing plates

C.1.3.1 Manholes and Nozzles

Flange leaks and leaks around bolting

Check for:

Check for:

d)

Proper operation of regulators for tanks with purge gas systems

Reinforcing pad tell-tale holes are plugged with grease

Check for:

Leaks at piping manifolds, flanges, and valves

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

C.1.3.2 Tank Piping Manifolds

COMMENTS

c)

Sealing of insulation around manholes and nozzles

e) Adequate manholes flange and cover thickness on mixer manholes

Leaks at sample connections and proper valve operation Damage and test the accuracy of temperature indicators

TRVs - SFIs are installed in TRV assemblies

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A No access

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

1 1/2" ø galvanized pipe

STATUS COMMENTS

Tape gauge is inoperable

ITEM TASK

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)

a) b)

Proper mounting flange and support h)

Condition of power lines and connections to mixer e)

Check for:

i)

C.1.3.5 Heater (Shell Manhole Mounted) C.1.3.6 Mixer

Leakage

Bracing and supports for sample water draw-off lines and equipment 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.1.3.3 Autogauge System c) d)

C.1.3.4 Shell-mounted Sample Station Water Draw-Off System a) c)

Proper movement of tape by bumping the checker on autogauge head Size 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).

Actual product level compared to the reading on the autogauge. Make note.

(max. variation is 2 in.)

39' - 1" (tape); 12' - 1 10/16" (ATG)

Mechanical tape gauge is inoperable. There was condensation on glass/display f) g)

Condition of board and legibility of board-type autogauges Freedom of movement of marker and float

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

COMMENTS

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)

C.1.3.8 Swing Lines: External Guide System

Check for leaks at threaded and flanged joints 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 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

C.1.3.9 Swing Lines: Identify Ballast Varying Need

C.1.3.7 Swing Lines: Winch a) Operation

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

ITEM

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

STATUS

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

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A No access

Pass Fail N/A

Coating system is failing and has minor corrosion. Mold and algae on roof

Handrail toeboard does not allow proper drainage. Toeboard is touching the tank roof at several locations

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

C.1.4.4 Level of Floating Roof

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.)

ITEM TASK

C.1.4.5 Gas Test Internal Floating Roof

STATUS

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

COMMENTS

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.1.4.2 Deck Plate External Corrosion

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 Roofs

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

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).

STATUS COMMENTS

No access

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.

C.1.4.7 Floating Roof Seal a) Systems c) d) e)

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 b) c)

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

Check for:

a)

ITEM TASK

C.1.4.6 Roof Insulation

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.

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.

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

No access

Aluminum construction

No marker or tab stating hold-off distance

COMMENTSSTATUS

Operation of systemg)

h) 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)

C.1.5.1 Sample Hatch

C.1.4.7 Floating Roof Seal h) Systems

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.

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

ITEM TASK

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.

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

C.1.5 Roof Appurtenances

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.

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

STATUS COMMENTS

No hold-off distance

Valve leakage and for presence of a bull plug or blind flange, if the tank has a gauge well washer

Overall conditions Automatic sealing after sampling, when equipped with a fabric seal

Check for:

Check condition of screens, locking and pivot pins.

Proper operations when equipped with a recoil reel opening device b)

Check for:

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

No access

C.1.5.6 Sample Hatch (Internal Floating Roof) a) b) e)

A hold-off distance marker and tab with hold-off distance (legible) c)

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

d) The distance from the gauge well pipe to the tank shell at different levels, if accessible

Inspect scaffold support for corrosion, wear and structural soundness.

C.1.5.3 Fixed Roof Scaffold Support

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

C.1.5.5 Autogauge: Float Well Cover

a) Corrosion

Wear or fraying caused by rubbing of the tape cable on the cover a) b) c)

C.1.5.2 Gauge Well

ITEM TASK

Check for:

Thinning, size of slots, and cover condition of the visible portion of the gauge well

Condition of roof guide for gauge well, particularly the condition of the rollers for grooving on floating roofs

Check for:

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

Corrosion and missing bolts on the hatch

No access

No access

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

No access

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

Inspect for pitting and holes, paint failure.

Inspect attachment welds.

Identify cold joints and sharp edges.

Inspect the handrails and midrails.

Check for:

ITEM TASK

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

2" x 1 1/2" angle for circumferential stairs.

2 1/2" x 2 1/2" angle for roof perimeter handrail

C.1.6 Accessways - See Tank Out-of-Service Inspection Checklist Item C.2.12 b) d)

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

a) Condition of the screen on the rim vent cover

b) Plating off or removal of rim vents where jurisdictional rules do not permit removal

C.1.5.13 Pontoon Inspection a) Hatches

Open pontoon inspection hatch covers and visually check inside for pontoon leakage.

C.1.5.9 Emergency Roof Drains

C.1.5.10 Removable Roof Leg Racks

C.1.5.11 Vacuum Breakers

C.1.5.12 Rim Vents

Inspect vapor plugs for emergency drain: that seal fabric discs are slightly smaller than the pipe ID and that fabric seal Is above the liquid level.

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

Minor coating failure, mold, and algae growth

No access

STATUS COMMENTS

C.2.12 Access Structures

C.2.12.1 Handrails a) b) c)

Check for leg racks on 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

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Welded

Stair treads welded directly to shell

Corrosion on platform and grating

Minor corrosion on stair treads

Reinforcing pads where supports are attached to shell or roof.

c)

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

Check for:

ITEM TASK

c) d)

Corrosion-caused thinning of bars and failure of welds on grating Grating tie down clips. Where grating has been retrofitted to replace plate, measure the rise of the step below and above the grating surface and compare with other risers on the stairway.

C.2.12.4 Stairway Stringers

Check for:

Corrosion-caused thinning or holes (not drain holes) and paint failure on the deck plate a) a)

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

Minor corrosion on deck grating

e) Seal-weld on flat surface–to-flat surface junctures

Corrosion and paint failure on frame Corrosion and weld failure on the attachment of frame to supports and supports to tank

C.2.12.3 Deck Plate and Grating

c) Corrosion on steel support attachment to concrete base

Stairway supports to shell welds and reinforcing pads.

d)

b) Rust scale buildup on plate-to-frame weld

Check for:

Corrosion, paint failure, and weld failure on spiral stairway stringers

STATUS COMMENTS

b)

C.2.12.1 Handrails e) f)

C.2.12.2 Platform Frame a) b)

Thinning and holes on the surface that deck plate or grating rests on

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

Inspect track supports on roof for reinforcing pads seal-welded…