Attachment J Previous API In-Service Inspection Report (Tank 409).pdf

US Army Corps of Engineers Omaha District

API 653 In-Service Inspection Report

Tyndall Air Force Base, Florida

Facility 409

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

USACE POL-TCX

15 May 2017

API 653 In-Service Inspection Report Tyndall Air Force Base, Florida

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

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

ULS Ultra Low Sulfur

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. 0021 to perform API 653 In-Service Inspections. As required by this task, Brockenbrough executed a tank inspection site visit to Tyndall Air Force Base outside of Panama City, Florida.

An API 653 In-service (visual external) Inspection was conducted for Tank Facility No. 409 on February 1, 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 409 is a 50-foot diameter by 32-foot tall single wall, vertical, field erected tank with a nominal storage capacity of 10,000 barrels of jet fuel (F-24). The tank was fabricated by Gulf Tank Company in 1985 (per the manufacturer’s nameplate). Secondary containment is provided by a concrete dike wall with a membrane liner topped with a gravel ballast. The tank includes a release prevention barrier and a cathodic protection system built into the foundation, with tell-tale ports and a monitoring well for leak detection. 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

February 2022. An API Standard 653 Out-of-Service (internal) Inspection was conducted in August of 2011, repairs were completed, and a post repair internal inspection was conducted by December of 2011. An ultrasonic thickness inspection also occurred during that time. The previous inspection report indicates the next ultrasonic thickness inspection of the shell should be performed by August 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 a result, we recommend the next API Standard

653 Out-of-Service Inspection should be performed by August 2026 to coincide with the next ultrasonic thickness inspection. This inspection should include an examination of the tank bottom by magnetic flux leakage (MFL or

MFE) technology and an evaluation of the cathodic protection system. This inspection should include a thorough code compliance evaluation as well.

THIS INSPECTION

API In-Service (External) Inspection Date: 01 February 2017 Equipment Used:

Laser Level Manufacturer: CST Berger Model Number: LHV Laser Level Calibration Method: Self Leveling Inspector(s): Andrew Swenck Bryan Strayer

PREVIOUS INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: 23 August 2011 API In-Service (External) Inspection Date: 23 August 2011

RECOMMENDED FUTURE INSPECTION DATES

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

Andrew Swenck, PE Structural Engineer API 653 Inspector No. 56234 STI SP001 Inspector No. AC 44122

GENERAL TANK INFORMATION

ITEM DESCRIPTION

Owner U.S. Air Force

Location Tyndall Air Force Base

Facility Number Facility 409

Tank Number Tank 409

State / Country Florida / U.S.A.

City Panama City

Inspection Date February 1, 2017

Tank Manufacturer Gulf Tank Company

Design Standard API Standard 650

Date of Construction 1985

Tank Contents Jet Fuel F-24

Tank Serial Number 9805A

Tank Diameter 50’-0”

Shell Height 32’-0”

Product Height 28’-0” (per tank repair data plate)

Tank Capacity 10,000 bbl nominal

Foundation Concrete Ringwall

Construction

Bottom Lap-welded plate, cone down

Shell (4) butt welded shell courses

Floating Roof Aluminum honeycomb pan

Fixed Roof Lap-welded plate, cone up

Material

Bottom A36 Carbon steel

Shell A36 Carbon steel

Floating Roof Aluminum

Fixed Roof A36 Carbon steel

Cathodic Protection Impressed Current

Interior Coating System Epoxy

Exterior Coating System Epoxy/Polyurethane

Level Gauging Enraf ATG System & Protectoseal Tape Level Gauge

Overfill Protection Hydraulic Operated Level Control Valve, High Level Alarm and High-high Level Alarm, (1) Shell Overflow Vent

Piping Receipt 10” Carbon Steel

Issue 12” Carbon Steel

Low Suction 4” Carbon Steel

Water Draw-Off 1” Carbon Steel

Level Alarms Low-Low, Low, High, and High-High Level Alarms & ATG Alarm

Type of Internal Floating Roof

Aluminum honeycomb 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 409 (Tank 409), an API Standard 653 In‐Service (External) Inspection was performed.

2. Site Information

On February 1, 2017 Brockenbrough performed an API 653 In‐Service (External) Inspection of Tanks

407, 409, 6045, and 6047 located at Tyndall Air Force Base, Florida. Tyndall Air Force Base is home to the 325th Fighter Wing of the Air Combat Command. The 325th Fighter Wing’s primary mission is to train and project unrivaled combat air power for F-22 Raptor pilots and maintenance personnel to support the combat Air Forces.

B. TANK INSPECTION COMMENTS

1. Tank Construction

Tank 409 is a nominal 10,000 bbl, 50‐foot diameter by 32‐foot tall, Jet Fuel F-24, aboveground, vertical storage tank. Per the manufacturer’s nameplate, the tank was constructed in 1985 to API Standard 650.

The tank erector is Gulf Tank Company. As‐built drawings of the original construction are not available, but per the previous inspection report, the shell is constructed of A36 steel with 5/16th-inch thick bottom course and 1/4-inch thick upper courses.

2. Tank Foundation

The tank rests on an elevated concrete ringwall. The foundation was visually evaluated during the inspection for broken concrete, spalling, cracks, and vegetation against the bottom of the tank, and was found to be in generally good condition. Major tank repairs were conducted as part of the 2011 inspection, and included a new tank bottom. A cathodic protection system is built into the foundation per Repair Documentation. Leak detection piping and a monitoring well penetrates the ringwall. 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 cylindrical shell consists of four carbon steel butt‐welded courses. The exterior of the shell was visually inspected and evaluated for plumbness, roundness, peaking and banding. The shape of the shell appears to be within the allowable tolerances of API Standard 653. The coating was evaluated for deterioration. There are some very minor areas of coating failure and corrosion.

4. Tank Appurtenances

a. Tank Roof

The tank roof is a lap-welded fixed roof. Minor areas of coating failure and corrosion were observed on the roof, inspection hatches, manholes, flanges, nuts, and bolts. Additionally, minor coating failure and corrosion were observed on the perimeter guardrail and posts. There are also areas of plate external pitting that appeared to have been coated over during the previous repairs.

b. Venting

This tank features a 24-inch primary tank center vent, two perimeter roof-mounted vents/inspection hatches, and one shell overflow vent. The center vent screen does not cover the entirety of the vent opening. However, the tank is equipped with adequate normal and primary venting capacity based on equipment research and the size of the tank.

c. Gauging

The tank’s “Enraf” ATG is installed through a 10‐inch nozzle. The nozzle contains an 8-inch stilling well. The tank contains a “Vito” water probe through an 8-inch nozzle with stilling well located over the bottom sump. The tank has a separate manual sample gauging hatch also located in a 10-inch nozzle with an 8-inch stilling well. The tank also has a Protectoseal tape level gauge

(autogauge).

d. Level Alarms

The high and high-high level alarm chambers are mounted on the exterior of the tank shell and are accessible from the circumferential stairway. The tank is also equipped with low-low and low level alarms independent of the tank ATG system.

e. Stairs and Platforms

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

There is isolated coating failure and corrosion on the stairway. Corrosion was observed on the top platform frame and handrails. There is also corrosion on the frame to shell connection. In addition, the platform frame is not seal welded to the supporting members from the tank. The handrail height slightly exceeds OSHA limits, but does not appear to present a safety hazard. The bottom platform grating is installed incorrectly, and should be corrected for maximum support.

f. Grounding and Bonding

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

5. Tank Coating

The exterior of the tank is coated. From the previous inspection report, it was determined that the interior of the tank is also coated. The exterior shell coating shows no signs of significant deterioration.

However, there are some locations of minor coating failure and some minor corrosion on the tank bottom extension. With the exception of isolated corrosion on some of the appurtenances, and isolated coating failure on the shell, tank bottom extension and roof, the external coating appears to be in good condition.

6. Tank Piping System

Fuel is received through a 10-inch nozzle and 10-inch carbon steel piping that ties into a pipeline from the bulk tanks (Tanks 6045, 6046, and 6047). Fuel is issued to truck fillstands from the tank via a 12-inch nozzle tied to 12-inch carbon steel piping.

7. Fire Protection System

There are two fire hydrants noted within 300 feet of this tank, one of which is located outside of the fuel facility fence.

8. Secondary Containment

The tank sits within a concrete secondary containment area with vertical concrete walls. A fuel resistant liner has been installed over the concrete, and liner along the floor is covered by a gravel ballast. The liner turns up and terminates on the interior of the concrete walls. There are several conduits running in the gravel ballast and along the floor of the containment. This causes a potential tripping hazards and the potential for the conduits to be sitting in water. The dike wall has a locked drain valve for drainage. The secondary containment was visually evaluated during the inspection.

The dike is shared with the adjacent 50-foot diameter tank (Facility 407), and has an intermediate wall.

The containment is of sufficient size to contain a total tank loss plus 12 inches of freeboard as required by UFC 3-460-01, 8-14.2.1.

C. FINDINGS AND RECOMMENDATIONS

Tank Facility 409 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. For basis of the estimated costs, the total for each repair is a rough order of magnitude cost that includes the cost to perform the repair and limited Contractor mark-ups. These totals do not include mobilization to the site, supervision, inspection, and overhead, or other construction expenses.

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, Tank Appurtenances, and Associated Piping Equipment

OBSERVATION: Minor corrosion and isolated coating failure were observed on the tank shell, roof, and other various tank appurtenances. There is also minor coating system failure and corrosion on the valves and piping.

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

RECOMMENDATION: Remove the corrosion and repair the coatings at isolated areas of deterioration, including the tank shell, tank bottom projection, circumferential stairway, handrails, platform, etc.

Remove and replace the coating system on the valves and receipt piping.

G6CDQASM

Sticky Note Minor coating repairs can be performed while the tank is in service

b. Upgrade Water Draw-Off System

OBSERVATION: The water draw-off system is outdated and is constructed with a 1 ½-inch shell nozzle, a thermal relief assembly, isolation ball valves, and threaded piping. The thermal relief is required due to the system tank and pump being located approximately 30 feet from the tank shell.

REFERENCE: From an overall operational standpoint, the water draw-off system should be upgraded to meet current standards. UFC 3-460-01, Table 8-1, item aa) and AW 78-24-27 detail an updated system immediately adjacent to the tank that requires two 2-inch shell nozzles. UFC 3-460-01, paragraph 4-6.8.2 requires all tank skin valves to be double block and bleed type valves. Paragraph

9-8 e) requires the use of welded connections for joining steel pipes.

RECOMMENDATION: Provide an updated water draw-off system per AW 78-24-27 nearer to the tank shell in order to eliminate the need for a thermal relief assembly. Provide the required size and type shell nozzles and valves.

Wait for next OOS

c. Upgrade Thermal Relief Piping System

OBSERVATION: The existing thermal relief assembly on the receipt line contains threaded piping and the assemblies for the issue, receipt, and water draw-off are all attached to the tank shell.

REFERENCE: UFC 3-460-01, paragraph 9-8 e) requires the use of welded connections for joining steel pipes. AW 78-24-27 requires thermal relief piping to be attached to the tank nozzle and not directly to the tank shell.

RECOMMENDATION: Replace the threaded piping associated with the thermal relief valve assemblies with welded piping. Reinstall the assemblies to the tank nozzle. Per prior recommendation (b), the thermal relief assembly for the water draw-off system will not be required if the system is replaced.

d. Remove Fine Screens from Overflow and Roof-Mounted Vents

OBSERVATION: The tank overflow and roof-mounted vents have fine screens in addition to the larger bird screens. The fine mesh screens can become easily clogged, especially during recoating operations, and reduce the capacity of the tank venting.

REFERENCE: UFC 3-460-01, paragraph 8-8.3 b) and Table 8-1, item m) require open atmospheric vents with bird screens.

RECOMMENDATION: Remove the fine mesh screens and leave the larger bird screens in place.

e. Provide Appropriate Size Screen on Tank Roof Center Vent

OBSERVATION: The tank roof center vent screen does not fully cover the vent opening.

REFERENCE: UFC 3-460-01, paragraph 8-8.3 b) and Table 8-1, item m) require open atmospheric vents with bird screens.

RECOMMENDATION: Provide center vent screen to fully protect vent opening.

Wait for next OOS

G6CDQASM

f. Remove Gravel from the Dike Containment Area

OBSERVATION: The dike containment area is lined with a flexible membrane liner (FML) covered with pea gravel. Some of the conduit running along the containment floor is partially submerged in the gravel creating possible tripping hazards. The gravel prevents inspection of the entire membrane liner, and can also allow the growth of vegetation in the containment area.

REFERENCE: UFC 3-460-03, paragraph 8-10.5.1 D, requires periodic inspection of the flexible membrane liner for tears and punctures.

RECOMMENDATION: Remove all of the gravel from the containment area to allow for thorough periodic inspection of the FML. Repair and seal the liner wherever necessary. Provide sand bags or other suitable means to prevent liner from experiencing wind uplift.

Can be performed while the tank is in service

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. Low Suction to Main Suction/Issue Connection

OBSERVATION: The 4-inch low suction line is not connected to the 12-inch main suction/issue line.

REFERENCE: 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: Due to the location of the low suction nozzle relative to the issue nozzle and the proper functionality of the tank operations, we do not recommend any modifications at this time.

b. Provide New Bolts on ATG Well Hatch

OBSERVATION: The galvanized bolts on the ATG well hatch are corroding.

REFERENCE: UFC 3-460-01, paragraph 8-3.10 requires the exterior surfaces of tanks to be coated in accordance with appropriate guide specifications. Also, utilizing galvanized bolts to connect stainless steel parts increases the likelihood of corrosion of the parts.

RECOMMENDATION: Remove the galvanized bolts and replace with stainless steel bolts.

Wait for next OOS

G6CDQASM

c. Provide Upper Shell Manhole, Access Stairway, and Access Platform

OBSERVATION: There is no upper shell manhole or associated stairway platform for accessing the top of the floating pan or the floating pan’s perimeter seals.

REFERENCE: UFC 3-460-01, Table 8-1, item c), and AW 78-24-27, require a shell manhole located above the internal floating pan’s high leg position to aid in venting the tank during cleaning and to provide access to the floating pan’s elastomeric wiper seal. AW 78-24-27 also requires a stairway and platform for accessing the upper shell manhole.

RECOMMENDATION: Provide a shell manhole above the internal floating pan’s high leg position.

Alter the circumferential stair to include a stairway and platform for access to the manhole.

d. Increase Manhole Size

OBSERVATION: There is one 36-inch diameter manhole with a davit support and one 30-inch diameter manhole without a davit support on the tank shell.

REFERENCE: UFC 3-460-01, Table 8-1, item f) and AW 78-24-27 require shell manholes to be 36 inches in diameter and support be davits.

RECOMMENDATION: Replace existing 30-inch manhole with a 36-inch manhole supported from the shell by a davit.

Leave as is

G6CDQASM

Leave as is

e. Provide Scaffold Cable Supports

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

REFERENCE: UFC 3-460-01, Table 8-1, item ff) and AW 78-24-27 require at least two scaffold cable supports on fixed tank roofs near the center of the tank so that supported cables will have maximum range and flexibility of operation with minimum interference with other tank fittings.

RECOMMENDATION: Provide a minimum of two scaffold cable supports on the tank roof.

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. Monitor Roof Drainage

OBSERVATION: There is evidence of water ponding at small areas on the tank roof.

REFERENCE: AW 78-24-27 requires roofs to be sloped to prevent water from ponding which may cause coating deterioration and plate corrosion.

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

b. Monitor Roof Plate Pitting

OBSERVATION: There are areas where the tank roof plate is pitted. These areas were noted on the previous tank inspection and presumed to be satisfactory in their current state as long as the plate was to be coated. The coating appears to be in good condition with no failure or corrosion at the areas in question.

REFERENCE: API 650 and AW 78-24-27 require fixed tank roofs to be a minimum thickness with a tolerable corrosion allowance. UFC 3-460-01, paragraph 8-3.10 requires the exterior of fuel storage tanks to be coated.

RECOMMENDATION: Monitor the roof plate to prevent further pitting or further deterioration of the existing pitted locations.

Can be performed while the tank is in service

G6CDQASM

c. Repair Platform Grating

OBSERVATION: The low stair platform has the grating installed in the wrong direction. The grating is not supported by the outside angle members, which creates flexing in the platform.

REFERENCE: The platform as installed does not have the load bearing capacity as designed.

RECOMMENDATION: Replace the grating on the lower platform. Provide new grating oriented such that the bearing bars are continually supported by the platform frame.

d. Repair Concrete Foundation

OBSERVATION: The concrete foundation for the tank has minor systematic cracking and spalling.

The cracks and spalling can introduce openings for water intrusion. The intrusion of water into the cracks could result in deterioration of the steel reinforcing bars, widening of the cracks, and spalling of the concrete due to expansion of freezing water.

REFERENCE: DoD Standard Design AW 78-24-27 requires tanks to be properly supported on a steel reinforced concrete ringwall. Failure to repair the cracks may result in a compromised foundation.

RECOMMENDATION: Seal the cracks in the concrete ringwall foundation.

Wait for next OOS

G6CDQASM

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

SHELL SETTLEMENT SURVEY

Austin Brockenbrough & Associates, L.L.P. Job No. 16-074.02

Location: Tyndall AFB Date: 3/21/2017

Subject: Tank 409 - Shell Settlement Evaluation By: Andrew C. Swenck

API 653 Appendix B

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

Diameter (D) = 50 (ft)

Number of equally spaced data points (ft)= 8

L = Arc length between measurement points (ft) = 19.63

Tank Height (H) = 32.0 (ft)

Survey Height of

Position Weld * Z U S

0 6 41.13 0.00 0.32 0.32 0.67

1 7 42.00 0.88 0.40 -0.48 -0.56

2 8 41.88 0.75 0.60 -0.15 0.06

3 1 41.88 0.75 0.80 0.05 0.18

4 2 42.13 1.00 0.89 -0.11 -0.29

5 3 41.63 0.50 0.80 0.30 0.37

6 4 41.75 0.63 0.60 -0.02 -0.06

7 5 41.75 0.63 0.40 -0.23 -0.37

8 6 41.13 0.00 0.32 0.32 0.19

Maximum out-of-plane deflection = 0.67

* = 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) = 36,000

E = Young's modulus of elasticity (lbf/in2) = 29*10^6

S allowable (in) (API 653 B.3.2.1) = (L^2*Y*11)/(2EH)*12 = 0.99 in

R^2 =(Syy - SSE)/Syy = 0.40 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. 16-074.02

Location: Tyndall AFB Date: 3/21/2017

Subject: Tank 409 - Shell Settlement Evaluation By: Andrew C. Swenck

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 39.3 0.750 0.80 OK

2 58.9 0.167 1.20 OK

5 58.9 0.375 1.20 OK

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

Si < Smax →

Si < Smax →

Si < Smax →

0.00

0.20

0.40

0.60

0.80

1.00

1.20

0 2 4 6 8 10

Measured Elevation

Si2 Si5Si0

SHELL THICKNESS CALCULATIONS

The following shell thickness analysis is taken from a previous API 653 Internal Inspection Report (Post Repair) prepared by PetroChem Inspection Services in December 2011. This analysis is included as a reference and should be used for informational purposes only.

API 653 Inspection Report Out-of-Service

Owner: United States Air Force Date: August 23, 2011 and December 8, 2011 Location: Panama City, Florida Page: 22 of 75 Tank: 409 Project No.: 722808506

TÜV SÜD PetroChem API Inspection Report 722808506_409rpost 12/19/2011

2.3 SHELL INSPECTION

Shell thick ness calc ulations ind icate t he s afe fill height of 32.00 feet ca n be utilized with product specific gravities up to 1.00 (ref. API 653, Para. 4.3. 3.1).

These calculations do not take into a ccount operational restri ctions imposed by such items as any internal or external floating roof, internal pressure, overfl ow vents, etc.

Course Year

Original Construction

Year Thickness Measured

Assumed Nominal

Thickness* (in.)

Measured Thickness

(in.)

Shell Course Corrosion

Rate (in./yr.)

Remaining Corrosion Allowance

(in.)

1 1985 2011 0.313 0.320 -0.000269 0.149 2 1985 2011 0.250 0.252 -0.000077 0.125 3 1985 2011 0.250 0.251 -0.000038 0.151 4 1985 2011 0.250 0.258 -0.000308 0.158

The above calculations are based on the average measured thicknesses and assumed nominal thic knesses. Rema ining life c ould not be determined on courses where the actual thicknesses we re greater than or equal to the past thickness readings.

The next Visual (VT) exte rnal inspection should be conducted within 5 years and no later than June 2016 (ref. API 653, Para. 6. 3.2.1). This calculation is based on the formula RCA/ 4N (where RCA is t he difference between the measured shell thickness and the minimum required th ickness in mils, and N is the shell corrosion rate in mils per year).

Shell corrosion rate calculations indic ate the next Ultrasonic Thickness (UT) inspection should be performed within 15 y ears and no later than June 2026 (ref.

API 653, Para. 6.3.3.2). This calculation is based on the formula RCA/2N (where RCA is the difference between the meas ured shell thickne ss and the minimum required thickness in mils, and N is the shell corrosion rate in mils per year).

The shell has coating failure (weathered, fading, cracking and chalking). The platform supports and the shell vents have coating failure with surface rust and early stages of corrosion. Considerat ion should be given to properly cleaning and re-coating the affected areas.

POST REPAIR: The external shell and shell vents have been re-coated and were found to be acceptable.

Visual (VT ) inspection of the shell-to- bottom weld was limited due to coating.

The shell-to-bottom weld was found to be in acceptable condition.

Location: Panama City, Florida Page: 24 of 75

2.3.1 SHELL THICKNESS CALCULATIONS

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

t

H DG

SE

min

2 6 1

Where:

S = See Table = Allowable Stress (psi) D = 50.00 = 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

(ft.)

Product Height

(ft.)

Joint Efficiency

Allowable Stress (psi)

Average Thickness

(in.)

Required Thickness

(in.)

Meets Required

Thickness

1 8.00 32.00 1.00 23,600 0.320 0.171 Y

2 8.00 24.00 1.00 23,600 0.252 0.127 Y

3 7.75 16.00 1.00 26,000 0.251 0.100 Y

4 8.25 8.25 1.00 26,000 0.258 0.100 Y

Shell thick ness calc ulations ind icate t he s afe fill height of 32.00 feet ca n be utilized with product specific gravities up to 1.00 (ref. API 653, Para. 4.3. 3.1).

These calculations do not take into a ccount operational restrictions imposed by such items as any internal or external floating roof, internal pressure, overfl ow vents, etc.

SHELL/ROOF ULTRASONIC THICKNESS MEASUREMENTS

The following shell and roof thickness readings are taken from the previous API 653 Internal Inspection Report

(Post Repair) prepared by PetroChem Inspection Services in December 2011. This data is included as a reference and should be used for informational purposes only.

Location: Panama City, Florida Page: 17 of 75

2.2.2 TABLES

TABLE A

POST REPAIR BOTTOM ULTRASONIC THICKNESS READINGS

(in inches)

PLATE

NO/ID

READING

1 0.320 2 0.320 3 0.320 4 0.315 5 0.324 6 0.320 7 0.312 8 0.312 9 0.320

10 0.318 11 0.314 12 0.317 13 0.321 14 0.316 15 0.313 16 0.322 17 0.321 18 0.312 19 0.318 20 0.321 21 0.321

Average: 0.318 Minimum: 0.312

Location: Panama City, Florida Page: 18 of 75

TABLE B

SUMP ULTRASONIC THICKNESS READINGS

Dish Style Sump Readings

READING NO/ID NORTH-SOUTH WEST-EAST

1 0.496 0.500 2 0.498 0.503 3 0.490 0.501 4 0.492 0.507 5 0.493 0.498 6 0.499 0.496 7 0.498 0.502 8 0.501 0.510 9 0.503 0.500 10 0.500 0.503

Average: 0.500 Minimum: 0.490

Location: Panama City, Florida Page: 25 of 75

2.3.2 TABLES

SHELL ULTRASONIC THICKNESS READINGS

READING

COURSE

COURSE

COURSE

COURSE

1 0.317 0.250 0.248 0.256 2 0.319 0.253 0.249 0.258 3 0.318 0.252 0.250 0.257 4 0.319 0.253 0.253 0.259 5 0.319 0.253 0.254 0.258 6 0.319 0.252 0.253 0.259 7 0.320 0.251 0.252 0.261 8 0.321 0.252 0.252 0.258 9 0.322 0.252 0.253 0.258

10 0.321 0.250 0.249 0.257 Average: 0.320 0.252 0.251 0.258 Minimum: 0.317 0.250 0.248 0.256

Location: Panama City, Florida Page: 58 of 75

2.5.5 TABLES

FIXED ROOF ULTRASONIC THICKNESS READINGS

PLATE

READING

READING

READING

1 0.194 0.191 0.192 2 0.193 0.194 0.195 3 0.197 0.195 0.196 4 0.199 0.196 0.198 5 0.199 0.197 0.197 6 0.199 0.200 0.200 7 0.199 0.201 0.200 8 0.195 0.196 0.197 9 0.195 0.198 0.196 10 0.197 0.196 0.198 11 0.189 0.191 0.190 12 0.188 0.191 0.193 13 0.197 0.198 0.199 14 0.195 0.197 0.196 15 0.193 0.194 0.196 16 0.192 0.191 0.193 17 0.193 0.194 0.190 18 0.194 0.197 0.195 19 0.195 0.197 0.197 20 0.191 0.194 0.195 21 0.189 0.187 0.187 22 0.185 0.186 0.184 23 0.193 0.191 0.190 24 0.189 0.190 0.189

Average: 0.194 Minimum: 0.184

TANK DRAWINGS

The following tank drawings are taken from the previous API 653 Internal Inspection Report (Post Repair) prepared by PetroChem Inspection Services in December 2011, and are is included as a reference and should be used for informational purposes only. Locations of appurtenances, shell and roof plates, etc. are approximate.

2.4.2 POST REPAIR NOZZLE AND APPURTENANCE TABLE Page 35 of 75

Item Description Size (in.)

Station* (ft)

CL

Elev.

(in.)

Reinforcing Plate Neck Thick (in.)

Flng Thick (in.)

Cover Thick (in.)

Tell-tale

Weld Space

(in.)

Comments Width

(in.)

Height

(in.)

Thick (in.)

Shape

A Man way 30 0.00 36 80 65 0.263 A 0.302 0.472 0.536 Y 2.5 B Ground Clip --- 10.80 --- --- --- --- --- --- --- --- --- --- C Platform --- 13.60 --- --- --- --- --- --- --- --- --- --- D Coupling --- 23.15 --- --- --- --- --- --- --- --- --- --- Course 4 E Coupling --- 23.15 --- --- --- --- --- --- --- --- --- --- Course 4 F Coupling --- 24.50 --- --- --- --- --- --- --- --- --- --- Course 4 G Coupling --- 24.50 --- --- --- --- --- --- --- --- --- --- Course 4 H Coupling 1 24.80 50.50 --- --- --- --- 0.177 0.529 --- --- 49 I Coupling 1 24.80 26.25 --- --- --- --- 0.177 0.528 --- --- 25 J Coupling 2 49.10 11.50 --- --- --- --- 0.188 0.663 --- --- 10 K Ground Clip --- 50.00 --- 13 12.50 0.312 D --- --- --- --- --- L Coupling 1 51.30 10.50 --- --- --- --- 0.173 0.592 --- --- 9.00 M Stairway --- 56.60 --- --- --- --- --- --- --- --- --- --- Bottom N Coupling 1 67.80 26 --- --- --- --- 0.173 0.611 --- --- 26 O Nozzle 10 69.80 15 24 24 0.265 B 0.505 1.263 --- Y 2.50 P Patch Plate --- 71.60 35.50 6.50 6.50 0.304 B --- --- --- --- 32 Q Patch Plate --- 73.70 36.50 6.50 6.50 0.314 B --- --- --- --- 32 R Man way 36 79.70 44.00 73 78 0.317 D 0.316 0.608 0.775 Y Flush S Shell Vent --- 82.80 --- --- --- --- --- --- --- --- --- --- T Level Gauge --- 85.60 --- --- --- --- --- --- --- --- --- --- U Coupling --- 86.70 --- --- --- --- --- --- --- --- --- --- Course 4 V Coupling --- 86.70 --- --- --- --- --- --- --- --- --- --- Course 4 W Patch Plate --- 86.75 30 6.50 6.50 0.308 B --- --- --- --- 26 X Patch Plate --- 86.80 6.00 12.50 12 0.312 D --- --- --- --- Flush Y Nozzle 12 89.40 17 27 27 0.253 B 0.385 1.318 --- Y 2.50 Z Ground Clip --- 89.40 --- --- --- --- --- --- --- --- --- ---

AA Coupling 1 91.50 29.50 --- --- --- --- 0.171 0.593 --- --- 24 BB Patch Plate --- 95.80 35 6.50 6.50 0.308 B --- --- --- --- 32 CC Patch Plate --- 97.85 35 6.50 6.50 0.313 B --- --- --- --- 32 DD Patch Plate --- 99.90 35 7 7 0.312 B --- --- --- --- 31 EE Nozzle 4 119.00 12 12 12 0.275 B 0.240 0.916 --- Y 5 FF Ground Clip --- 128.85 --- --- --- --- --- --- --- --- --- ---

*Stations are measured circumferentially counterclockwise from Manway A

Shape

A B C D E GF H I J K L

Comments: 1 Inadequate weld spacing 2 Inadequate repad thickness 3 Inadequate repad dimensions 4 Inadequate centerline elevation 5 Less than 90 intersection w/ shell-to-bottom weld 6 No reinforcing plate 7 Square cornered repad 8 Inadequate neck thickness 9 Plugged telltale hole 10 No telltale hole

Location: Panama City, Florida Page: 55 of 75

2.5.2 POST REPAIR FIXED ROOF NOZZLE TABLE

Item Description Size (in.)

Plate No.

Neck Thick (in.)

Comments

A Nozzle 10 4 0.340 Sample Hatch B Access Hatch 30x30 6 0.250 Vertical Ladder C Nozzle 10 7 0.340 Sample Hatch D Access Hatch 30x30 14 0.250 E Access Hatch 24x72 17 0.250 F Nozzle 25 22/23 0.247 Center Vent G Nozzle 8 23 0.294 Sample Hatch

1 2

3 4 5

6 7 8 9

11 12

13 14 15 16

17 18 19 20 21

VS

13DEC11

722808506

CAPE

POST REPAIR

BOTTOM LAYOUT

2.2.1 POST REPAIR BOTTOM LAYOUT

REF

N

THIN FILM EPOXY

LAP WELDED

CARBON STEEL

MATERIAL:

TYPE JOINT:

GENERAL

INFORMATION

COATING:

LEGEND

NOT TO SCALE

TITLE

CLIENT

TANK NO.

PROJECT NO.

DATE

DRAWN BY

1475 EAST SAM HOUSTON

PARKWAY SOUTH, SUITE 100

PASADENA, TEXAS 77503

(281) 884-5100

FLOATING ROOF LEG

SETTLEMENT STATION

30" MANWAY (A)

1" COUPLINGS (H and I)

1" COUPLING (T)

1" COUPLING (L)

1" COUPLING (N)

10" NOZZLE (O)

36" MANWAY (R)

12" NOZZLE (Y)

1" COUPLING (AA)

4" NOZZLE (EE)

GAUGE POLEANTI ROTATION

29" DIA. X 12" DEEP DISH STYLE SUMP

VERTICAL LADDER

GAUGE POLE

ANTI - ROTATION

CENTER COLUMN

A B C D E

F G

H I

JKL M N O P Q R S T U

V W X

Y Z

AA BBCCDD EE FF

VS

14DEC11

722808506

CAPE

POST REPAIR

SHELL LAYOUT

2.4.4 POST REPAIR SHELL LAYOUT

REF

N

TAN PAINT

BUTT WELDED

CARBON STEEL

MATERIAL:

TYPE JOINT:

GENERAL

INFORMATION

COATING:

LEGEND

NOT TO SCALE

TITLE

CLIENT

TANK NO.

PROJECT NO.

DATE

DRAWN BY

1475 EAST SAM HOUSTON

PARKWAY SOUTH, SUITE 100

PASADENA, TEXAS 77503

(281) 884-5100

VS

13DEC11

722808506

CAPE

POST REPAIR

FIXED ROOF LAYOUT

2.5.4 POST REPAIR FIXED ROOF LAYOUT

REF

N

TAN PAINT

LAP WELDED

CARBON STEEL

MATERIAL:

TYPE JOINT:

GENERAL

INFORMATION

COATING:

LEGEND

NOT TO SCALE

TITLE

CLIENT

TANK NO.

PROJECT NO.

DATE

DRAWN BY

1475 EAST SAM HOUSTON

PARKWAY SOUTH, SUITE 100

PASADENA, TEXAS 77503

(281) 884-5100

PATCH PLATE

12 11

SPIRAL STAIRWAY

0.75" COUPLING

10" NOZZLE (A)

3" COUPLING

0.75" COUPLING

ROOF VENT

0.75" COUPLING

3" COUPLING

24" X 72" ACCESS HATCH (E)

0.75" COUPLING

30" X 30" ACCESS HATCH (D)

3" COUPLING

0.75" COUPLING

ROOF VENT

10" NOZZLE (C)

3" COUPLING

30" X 30" ACCESS HATCH (B)

0.75 COUPLING

0.75 COUPLING

25" NOZZLE (F)

8" NOZZLE (G)

0.75" COUPLING

OSHA ACCESS STRUCTURE REPORT

OSHA Stairway Data

OSHA Rq’d Actual

(in) min (in) max (in)

Handrail Height 43 NOT OK 30 37 Step Width 32 OK 22 NA

Step Rise 8 OK NA NA Bottom Step Rise 8 OK 6 1/2 9 1/2

Note: Although handrail height exceeds OSHA limits, it does not appear to present a safety hazard.

BOTTOM STEP

RISE

APPENDIX B: API 653 CHECKLISTS FOR TANK INSPECTIONS

UL SWRI

API Other

Protected

Type: Type:

Size: Date Installed:

Coated CS End Conn: Size: 10" Material: Coated CS End Conn: Size: 12"

Issue To:

Tank Outside Dimensions:

Nominal Capacity:

Useable Capacity:

Butt Welded

Truck Fillstands

Double Bottom

Current Product:

50'-0" dia by 32'-0" tall

2013 From JP-8

Tank Inspector Name:

Inspector Certification Number:

Insulated

Coated

Plastic / Fiberglass

Other:

Gulf Tank Company

2011Previous Tank Inspection Date:

Interior Coating:

56234

API 653 EXTERNAL INSPECTION CHECKLIST

Tyndall Air Force BaseProject Site:Project Name:

Project Location:

Brockenbrough Job No.:

SPCC Mandated AST Inspections - Group 5 Tyndall AFB, Florida

General Inspection Information

16-074.02 Submitted to:

Contract No.:

USACE - Omaha W9128F-12-D-0006

Horizontal

Inspection Date:

Design Std

Tank Facility No.:

Local Tank ID No.:

February 1, 2017

Tank Manufacturer:

Tank Construction Date:

Tank 409 Andrew C. Swenck

Vertical

Rectangular

Double Wall

Fire Resistant

Closed Top Dike

Change of Service:

Last Repair:

Tank Coatings:

Exterior Coating:

Epoxy/Epoxy/Polyurethane (Assumed)

Epoxy (From Previous Report)

Concrete Dike w/ Liner and Gravel Ballast

243' x119' x5'

Level Alarms:

Material: Butt Welded

Unknown

Overfill Protection:

Unknown

Tell-Tale Ports and Monitoring Well

Date Installed:

Overfill Protection / Level Alarms:

Low-Low, Low, High, & High-High Independent Level Alarms High Level Control Valve on Receipt Piping; High and High-High Level Alarms

Receipt Piping Configuration Issue Piping Configuration

Tank Piping

Receipt From: Transfer pipeline from bulk tanks or tank truck off-loading

Tank Specifications

Continuous Release Detection Monitoring

Type:

Secondary Containment, Overfill, and CRDM

Tank Construction and Configuration

Jet Fuel F-24

10,000 BBL

N/A

Single Wall

Open Type Dike

Release Prevention BarrierSecondary Containment

Unknown

API 653 EXTERNAL INSPECTION CHECKLIST

Tyndall Air Force BaseProject Site:Project Name: SPCC Mandated AST Inspections - Group 5

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

Per facility personnel

C.1.1.7 Cathodic Protection

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

Measure foundation levelness and bottom elevations (See Annex B) See shell settlement survey c)

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

Check for:

a) b) a) b)

Minor systematic cracking and spalling.

C.1.1.2 Asphalt

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

10V, 1.2A (Shared system with Tank 407)

Settlement around perimeter of tank

ITEM

C.1.1 Foundation

C.1.1.1 Concrete Ring

STATUS COMMENTSTASK

Tank Settlement

C.1.1.4 Rock

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

Run-off rainwater from shell draining away from the tank

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

Check for:

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

d)

Review cathodic protection potential readings

Check for:

b) a)

Settlements into the base

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

Very minor isolated coating failure and corrosion.

Corrosion loss and wear on the rivets

Pitting on support welds to shell, especially on shell plates Reinforcing pads welded to shell at supports c)

Check for:

c)

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

STATUS

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

Paint failures, pitting, and corrosion Check for:

Check for:

C.1.2. Shells

ITEM TASK 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)

Leaks and identify the location by sketch or photo

Grooving, corrosion, pitting, and coating failures

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

Receipt piping is anchored adjacent to the tank, but does not appear to present a hazard to the tank.

Repad weep holes are open with no corrosion noted.

No davit on 30" manhole.

d)

a) Leaks at piping manifolds, flanges, and valves

C.1.3 Shell Appurtenances

STATUS

Shell plate dimpling around nozzles, caused by excessive pipe deflection c)

Sealing of insulation around manholes and nozzles

e) Adequate manholes flange and cover thickness on mixer manholes

C.1.3.2 Tank Piping Manifolds

COMMENTS

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:

TASK

Check for:

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

ITEM

a)

Damage on autogauge head

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

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

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

Proper operation of regulators for tanks with purge gas systems

Check for:

TRV piping is constructed with threaded piping on the receipt line and water draw-off piping. TRV piping is also attached directly to the shell. TRVs are set at 50 psi.

Protectoseal Automatic Tank Gauge

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

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

C.1.3.3 Autogauge System c) d)

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

ITEM TASK

h)

Condition of power lines and connections to mixer e) f) g)

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

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 c)

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).

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)

a) b)

Proper mounting flange and support Check for:

i)

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

Leaks in circulation pump and operating problems

Inspect condensate drain for presence of oil indicating leakage

2"coated steel.

STATUS COMMENTS

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

TASK

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

STATUS

C.1.3.12 Swing Lines: Target

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

C.1.3.7 Swing Lines: Winch a) Operation

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

C.1.3.9 Swing Lines: Identify Ballast Varying Need

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

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

COMMENTS

Check for leaks at threaded and flanged joints

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A No access

Pass Fail N/A

ITEM TASK

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

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.1.4.5 Gas Test Internal Floating Roof

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

C.1.4.4 Level of Floating Roof

C.1.4.3 Roof Deck Drainage

No access

No access, but plate was sounded before accessing top side for roof inspection.

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.)

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

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.

ITEM TASK

C.1.4.6 Roof Insulation

No access. Facility personnel indicated the wiper seal was replaced at the last repair.

b) c)

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

Check for:

a) 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

C.1.4.7 Floating Roof Seal a) Systems

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.

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).

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

Inspect wedge-type wiper…