Attachment I Previous API In-Service Inspection Report (Tank 407).pdf

US Army Corps of Engineers Omaha District

API 653 In-Service Inspection Report

Tyndall Air Force Base, Florida

Facility 407

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. 407 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 407 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 March of 2011, repairs were completed, and a post repair internal inspection was conducted by August 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 March 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 March 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: 02 August 2011 API In-Service (External) Inspection Date: 02 August 2011

RECOMMENDED FUTURE INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: March 2026 API Ultrasonic Thickness Inspection of Shell Date: March 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 407

Tank Number Tank 407

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

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 1/2” 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 407 (Tank 407), 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 407 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. It is unknown if the tank includes a release prevention barrier, but a cathodic protection system is built into the foundation per previous information. Leak detection piping and a monitoring well exists through the ringwall. Some minor corrosion was present along the perimeter of the tank bottom plate projection where the foundation-to-bottom seal has failed.

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 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 25-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 ATG is installed through an 10‐inch nozzle. The nozzle contains an 8-inch stilling well.

The tank has a separate manual sample gauging hatch also located in a 10-inch nozzle with an 8-inch stilling well. The tank contains a water probe through an 8-inch nozzle with stilling well located over the bottom sump. 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 gauging 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.

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 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 via a 10-inch nozzle tied to 10-inch carbon steel piping that then 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 only 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 membrane lined secondary containment with concrete dike walls. The portion of the liner along the ground 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 secondary containment has a locked drain valve for drainage. The secondary containment was visually evaluated during the inspection. The secondary containment is shared with the adjacent 50-foot diameter tank (Facility 409), and has an intermediate dike wall. The containment is of sufficient size to contain a total tank loss plus 12 inches of freeboard required by UFC 3-401-01.

C. FINDINGS AND RECOMMENDATIONS

Tank Facility 407 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 various tank appurtenances. Minor corrosion was observed on the tank bottom projection.

The coating system has also failed in several areas of the circumferential stairway, platform, handrails, and other appurtenances. There is also minor coating system failure and corrosion on the valves and piping.

CODE 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 Perform minor coating repairs as part of regular maintenance.

b. Repair Stair Top Platform Frame

OBSERVATION: The circumferential stairway top platform support angle has several holes underneath the grating bearing bars.

CODE REFERENCE: DoD AST Standard Design, AW 78-24-27, requires continuous and sound support for all walkway gratings.

RECOMMENDATION: Provide new coated grating support angle.

c. Upgrade Water Draw-Off System

OBSERVATION: The water draw-off system is outdated and is constructed with a 1 1/2" 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.

CODE 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

G6CDQASM

Wait for next OOS

d. 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.

CODE 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 (c), the thermal relief assembly for the water draw-off system will not be required if the system is repaired.

e. Repair Weep Holes on Shell Reinforcement Pads

OBSERVATION: The tall-tale holes on the shell reinforcement pads around the tank nozzles are open with corrosion occurring.

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: Repair the corrosion of the tell-tale holes in the reinforcement pads, and install an elbowed drain plug for leak detection.

f. 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.

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

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

Wait for next OOS

G6CDQASM

g. Provide Appropriate Size Screen on Tank Roof Center Vent

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

CODE 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.

h. 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.

CODE 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.

Wait for next OOS

G6CDQASM

Can be performed while tank is in service

i. Repair Tank Bottom-to-Foundation Seal

OBSERVATION: There are a few small areas where the tank bottom-to-foundation seal has failed causing the tank bottom plate projection’s coating to fail and corrosion to occur.

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

RECOMMENDATION: Remove the affected areas of the tank bottom-to-foundation seal. Prep and coat the tank bottom plate projection per AST standards, and replace the areas of removed tank bottom-to-foundation seal.

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.

CODE 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.

CODE 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.

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.

CODE 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.

CODE 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.

CODE 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.

f. Provide a Second Access Stair to the Dike Containment Area

OBSERVATION: The dike containment area is currently only accessible via one stair access. The only other way to access the shared containment is to cross through a small intermediate wall cutout between Tank 407 and Tank 409’s separate containment areas.

CODE REFERENCE: AW 78-24-27 requires at least two means of access to tank containment areas. It is also safe practice to have multiple egresses in case of emergency.

RECOMMENDATION: Modify metal stairway between Tank 407 and Tank 409’s containment areas to allow access from outside of containment.

Wait for next OOS

G6CDQASM

Can be performed while the tank is in service

g. Repair Damaged and Corroded Dike Containment Access Stair

OBSERVATION: The dike containment access stair has coating failure and corrosion, and the handrail is damaged.

CODE REFERENCE: AW 78-24-27 requires proper and safe means of access and egress from the containment areas.

RECOMMENDATION: Repair the handrail and clean, prep, and recoat the access stair assembly.

ESTIMATED COST: $10,000

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.

CODE 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 a few very isolated 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.

CODE 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

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

SHELL SETTLEMENT SURVEY

Austin Brockenbrough & Associates, L.L.P.

Job No. 16-074.02 Location: Tyndall AFB

Date: 2/27/2017 Subject: Tank 407 - 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 46.88 0.00 0.13 0.13 0.24 1 7 47.13 0.25 0.13 -0.12 -0.13 2 8 47.13 0.25 0.16 -0.09 0.00 3 1 47.13 0.25 0.18 -0.07 -0.12 4 2 46.88 0.00 0.19 0.19 0.26 5 3 47.13 0.25 0.18 -0.07 -0.18 6 4 47.00 0.13 0.16 0.03 0.13 7 5 47.13 0.25 0.13 -0.12 -0.19 8 6 46.88 0.00 0.13 0.13 0.13

Maximum out-of-plane deflection = 0.26

* = measured elevation

*HI (Height of Instrument) Z = calculated ridgd 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 modulas of elasticity (lbf/in2) = 29*10^6

S allowable (in) (API 653 B.3.2.1) = (L^2*Y*11)/(2EH)*12 = 0.82 in

R^2 =(Syy - SSE)/Syy = 0.04 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: 2/27/2017

Subject: Tank 407 - 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 0.250 0.67 Si < Smax → OK

4 39.3 0.250 0.67 Si < Smax → OK

6 39.3 0.125 0.67 Si < Smax → OK

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

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0 2 4 6 8 10

Measured Elevation (in)

Si4 Si0

Si6

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 August 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: March 21, 2011 and August 2, 2011 Location: Panama City, Florida Page: 19 of 69 Tank: 407 Project No.: 722807478

TÜV SÜD PetroChem API Inspection Report 722807478-407rpost.doc 8/9/2011

2.3 SHELL INSPECTION

Shell thickness calculations indicate the safe fill height of 32.00 feet can be utilized with product specific gravities up to 1.00 (ref. API 653, Para. 4.3.3.1).

These calculations do not take into account operational restrictions imposed by such items as any internal or external floating roof, internal pressure, overflow 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 0.344 0.318 0.001000 0.128 2 1985 2011 0.250 0.243 0.000269 0.102 3 1985 2011 0.250 0.256 -0.000231 0.156 4 1985 2011 0.250 0.259 -0.000346 0.159

The above calculations are based on the average measured thicknesses and assumed nominal thicknesses. Remaining life could not be determined on courses where the actual thicknesses were greater than or equal to the past thickness readings.

The next Visual (VT) external inspection should be conducted within 5 years and no later than March 2016 (ref. API 653, Para. 6.3.2.1). This calculation is based on the formula RCA/4N (where RCA is the difference between the measured shell thickness and the minimum required thickness in mils, and N is the shell corrosion rate in mils per year).

Shell corrosion rate calculations indicate the next Ultrasonic Thickness (UT) inspection should be performed within 15 years and no later than March 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 measured shell thickness and the minimum required thickness in mils, and N is the shell corrosion rate in mils per year).

The external shell has coating failure and surface rust. Consideration should be given to properly cleaning and re-coating these areas.

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

Location: Panama City, Florida Page: 21 of 69

2.3.1 SHELL THICKNESS CALCULATIONS

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

SE

DGH

t

)1(6.2 min

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 0.85 24,900 0.318 0.190 Y

2 8.00 24.00 0.85 24,900 0.243 0.141 Y

3 8.00 16.00 0.85 27,400 0.256 0.100 Y

4 8.00 8.00 0.85 27,400 0.259 0.100 Y

Shell thickness calculations indicate the safe fill height of 32.00 feet can be utilized with product specific gravities up to 1.00 (ref. API 653, Para. 4.3.3.1).

These calculations do not take into account operational restrictions imposed by such items as any internal or external floating roof, internal pressure, overflow 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 August 2011. This data is included as a reference and should be used for informational purposes only.

Location: Panama City, Florida Page: 13 of 69

2.2.2 TABLES

TABLE A

POST REPAIR BOTTOM ULTRASONIC THICKNESS READINGS

(in inches)

PLATE

NO/ID

READING

1 0.323 2 0.323 3 0.324 4 0.324 5 0.324 6 0.324 7 0.322 8 0.321 9 0.323

10 0.323 11 0.322 12 0.322 13 0.324 14 0.322 15 0.314 16 0.323 17 0.322 18 0.316 19 0.321 20 0.324 21 0.324

Average: 0.322 Minimum: 0.314

Location: Panama City, Florida Page: 14 of 69

TABLE B

POST REPAIR SUMP ULTRASONIC THICKNESS READINGS

Sump Wall Readings

READING

NO/ID

NORTH SOUTH EAST WEST

1 0.564 0.540 0.556 0.559 Average: 0.555 Minimum: 0.540

Dish Style Sump Readings

READING NO/ID NORTH-SOUTH WEST-EAST

1 0.515 0.503 2 0.501 0.506 3 0.500 0.505 4 0.503 0.501 5 0.499 0.500 6 0.490 0.501 7 0.500 0.504 8 0.501 0.502 9 0.507 0.503 10 0.504 0.507

Average: 0.503 Minimum: 0.490

Location: Panama City, Florida Page: 22 of 69

2.3.2 TABLES

SHELL ULTRASONIC THICKNESS READINGS

READING

COURSE

COURSE

COURSE

COURSE

1 0.317 0.250 0.253 0.258 2 0.312 0.246 0.250 0.260 3 0.321 0.241 0.258 0.257 4 0.318 0.248 0.260 0.257 5 0.320 0.245 0.260 0.255 6 0.315 0.238 0.252 0.260 7 0.319 0.241 0.251 0.263 8 0.320 0.236 0.255 0.261 9 0.316 0.247 0.257 0.258

10 0.319 0.242 0.259 0.259 Average: 0.318 0.243 0.256 0.259 Minimum: 0.312 0.236 0.250 0.255

Location: Panama City, Florida Page: 53 of 69

2.5.5 TABLES

FIXED ROOF ULTRASONIC THICKNESS READINGS

PLATE

READING

READING

READING

1 0.196 0.189 0.185 2 0.201 0.198 0.190 3 0.187 0.193 0.191 4 0.197 0.196 0.199 5 0.203 0.191 0.196 6 0.190 0.187 0.186 7 0.194 0.193 0.199 8 0.206 0.200 0.204 9 0.194 0.190 0.185 10 0.191 0.193 0.197 11 0.199 0.188 0.193 12 0.191 0.196 0.194 13 0.189 0.186 0.195 14 0.188 0.194 0.199 15 0.199 0.189 0.203 16 0.187 0.189 0.180 17 0.188 0.184 0.199 18 0.196 0.191 0.190 19 0.199 0.193 0.197 20 0.204 0.200 0.203 21 0.189 0.196 0.199 22 0.187 0.180 0.186 23 0.184 0.188 0.192 24 0.195 0.199 0.189

Average: 0.193 Minimum: 0.180

TANK DRAWINGS

The following tank drawings are taken from the previous API 653 Internal Inspection Report (Post Repair) prepared by PetroChem Inspection Services in August 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 29 of 69

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 Manway 36 0.00 44 73 77 0.317 D 0.315 --- 0.775 Y Flush B Level Gauge --- 5.95 --- --- --- --- --- --- --- --- --- --- C Lap Patch --- 7.20 30 7 7 0.316 B --- --- --- --- 14 D Coupling 1 7.30 --- --- --- --- --- --- -- --- --- --- Course 4, plugged E Coupling 1 7.30 --- --- --- --- --- --- --- --- --- --- Course 4, plugged F Lap Patch --- 7.40 6.25 13 12.5 0.316 D --- --- --- --- Flush G Nozzle 12 9.75 17 26 26 0.258 B 0.394 1.322 --- Y 2.5 H Ground Clip --- 9.75 --- --- --- --- --- --- --- --- --- --- I Coupling 1 11.20 46.5 --- --- --- --- 0.183 0.520 --- --- 19.5 J Lap Patch --- 11.90 29.0 --- --- 0.316 B --- --- --- --- 25.5 K Shell Vent --- 16.00 --- --- --- --- --- --- --- --- --- --- L Lap Patch --- 18.20 36 --- --- 0.318 --- --- --- --- --- 32 M Lap Patch --- 20.20 35.5 --- --- 0.316 B --- --- --- --- 31.5 N Nozzle 10 29.50 15 23 23 0.270 B 0.501 1.264 --- Y 2.25 O Coupling 1 30.70 26.5 --- --- --- --- 0.171 0.532 --- --- 4.5 P Lap Patch --- 31.50 26 7 7 0.313 B --- --- --- --- 4.5 Q Nozzle 4 39.40 11.5 12 12 0.274 B 0.233 0.912 --- Y 5 R Stairway --- 44.00 --- --- --- --- --- --- --- --- --- --- Bottom S Nozzle 1.5 48.00 10.5 --- --- --- --- 0.187 0.728 --- --- 8.5 T Lap Patch --- 49.10 6.5 13 12 0.316 D --- --- --- --- Flush U Coupling 1 51.10 10.5 --- --- --- --- 0.184 0.530 --- --- 9 V Coupling 1.5 76.20 --- --- --- --- --- --- --- --- --- --- Course 4, plugged W Coupling 1.5 76.20 --- --- --- --- --- --- --- --- --- --- Course 4, plugged X Coupling 1.5 77.80 --- --- --- --- --- --- --- --- --- --- Course 4 Y Coupling 1.5 77.80 --- --- --- --- --- --- --- --- --- --- Course 4 Z Manway 30 78.60 35 80 65 0.253 A 0.295 0.630 0.526 Y 3.5

AA Stairway --- 84.60 --- --- --- --- --- --- --- --- --- --- Top BB Ground Clip --- 88.40 --- --- --- --- --- --- --- --- --- --- CC Ground Clip --- 88.40 --- --- --- --- --- --- --- --- --- --- DD Lap Patch --- 144.0 35 7 7 0.315 B --- --- --- --- 31.5 EE Lap Patch --- 146.0 35 7 7 0.313 B --- --- --- --- 31.5 FF Lap Patch --- 148.0 --- --- --- --- --- --- --- --- --- 31.5

*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: 50 of 69

2.5.2 POST REPAIR FIXED ROOF NOZZLE TABLE

Item Description Size (in.)

Plate No.

Neck Thick (in.)

Comments

A Access Hatch 24x24 1 0.252 B Nozzle 10 3 0.373 Sample hatch C Vent --- 6 --- D Nozzle --- 10 --- Anti-rotation E Access Hatch 24x24 11 0.259 F Nozzle 2 13 --- Level gauge pipe G Access Hatch 72x24 14 0.383 H Vent --- 16 --- I Nozzle --- 20 --- Anti-rotation J Nozzle 10 20 0.376 Sample hatch K Vent 25 22/23 0.264 L Nozzle 8 23 0.292 Sample hatch

POST REPAIR FIXED ROOF SUPPORT DETAILS

Number of supports 1 Pipe Dimensions 36 inch x 36 inch x 1 inch thick

Number of rafters Row 1 25

1 2

3 4 5

6 7 8 9

10 11 12

13 14 15 16

17 18 19 20 21

AMC

08AUG11

722807478

CAPE

POST REPAIR

BOTTOM LAYOUT

2.2.1 POST REPAIR BOTTOM LAYOUT

REF

N

THIN FILM EPOXY

LAP WELDED

A36

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 LOCATION

CENTER COLUMN

ANTI ROTATION

GAUGE POLE

VERTICAL LADDER

GAUGE POLE

ANTI ROTATION

CENTER COLUMN

36" MANWAY (A)

12" NOZZLE (G)

1" COUPLING (I)

4" NOZZLE (Q)

1.5" NOZZLE (S)

1" COUPLING (U)

30" MANWAY (Z)

30" DIA. x 12" DEEP DISH-STYLE SUMP

10" NOZZLE (N)

1" COUPLING (O)

A BC

D E F

G

HIJ K L M NOP Q R S T U

V W X

Y Z

AA BB

EEDD FF

CC

AMC

08AUG11

722807478

CAPE

POST REPAIR

SHELL LAYOUT

2.4.4 POST REPAIR SHELL LAYOUT

REF

N

WHITE PAINT

BUTT WELDED

A36

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

SNR / AMC

25MAR11 / 08AUG11

722807478

CAPE

POST REPAIR

FIXED ROOF LAYOUT

2.5.4 POST REPAIR FIXED ROOF LAYOUT

REF

N

WHITE 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

24" X 24" ACCESS HATCH (A)

ROOF VENT (C)

ROOF VENT (H)

24" X 24" ACCESS HATCH (E)

COUPLING (TYP.)

SPIRAL STAIRWAY

NOZZLE (D)

25" CENTER ROOF VENT (K)

10" NOZZLE (B)

2" COUPLING (F)

72" x 25" ACCESS HATCH (G)

NOZZLE (I)

10" NOZZLE (J)

8" NOZZLE (L)

OSHA ACCESS STRUCTURE REPORT

OSHA Stairway Data

OSHA Rq’d Actual

(in) min (in) max (in)

Handrail Height 36 OK 30 37 Step Width 32 OK 22 NA

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

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:

Gulf Tank Company

1985 2011

Tank Outside Dimensions:

Nominal Capacity:

Useable Capacity:

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:

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 Inspecitons - 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 407 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: Welded

Unkown

Overfill Protection:

Unknown

Tell-Tale Ports and Monitoring Well

Date Installed:

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

Overfill Protection / Level Alarms:

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

Receipt Piping Configuration Issue Piping Configuration

Tank Piping

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 Inspecitons - 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

Builup of trash, vegetation, and other inflammables

Tank settlement into asphalt base

Check for:

a) b) a) b)

C.1.1.2 Asphalt

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

10V, 1.2A (Shared system with Tank 409)

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

Check for:

Very minor isolated coating failure and corrosion.

See comment to c)

STATUS

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)

Broken welds and corrosion damage

(paint failure, pitting, corrosion, product builup), especially where it occurs at tack-welded junction d) b)

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

Paint failures, pitting, and corrosion

Check for:

C.1.2. Shells

ITEM TASK

Grooving, corrosion, pitting, and coating failures

C.1.2.2 Internal (Floating Roof

Tank) c)

Check for:

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)

Very minor sealant failure causing minor corrosion of tank bottom projection.

Leaks and identify the location by sketch or photo

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

TASK

Issue piping is anchored adjacent to the tank, but appears it will not endanger the tank.

Repad weep holes are open with some minor corrosion inside.

No davit on 30" manhole.

Proper operation of regulators for tanks with purge gas systems

Check for:

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

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

Check for:

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

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:

ITEM

a)

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

b) Damage on autogauge head

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

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.

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

Condition of board and legibility of board-type autogauges

Freedom of movement of marker and float

16'-1 13/16" on Protectoseal; 16'-1 15/16" on ATG

C.1.3.3 Autogauge System c) d)

C.1.3.4 Shell-mounted Sample

Station Water Draw-Off System a)

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

ITEM TASK

h)

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

System is out-dated and includes threaded pipe and fittings with 1 1/2" nozzle.

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

Targe 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

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

C.1.3.7 Swing Lines: Winch a)

Operation

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 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.)

Some small areas of standing water on the deck plate.

No access

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

Very minor isolated corrosion and coating failure.