Attachment J - Previous Inspection Report tank 4300.pdf

US AArmy Corps

US A

Tan of Engineer rmy Co Omah

API 653

Inspec

Robin nk #24 rs Center of

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ns AFB, (Facilit

6/4/2019

Enginee rict rvice eport

GA

ty 4300 or Petroleum X) ers

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Table of Contents

ACRONYMS AND ABBREVIATIONS

GENERAL SUMMARY

INSPECTION INFORMATION

EQUIPMENT USED

STATE REGULATIONS

PREVIOUS INSPECTION DATES

RECOMMENDED FUTURE INSPECTION DATES

A. GENERAL PROJECT INFORMATION

1. API 653 Inspection

2. Site Information

B. TANK INSPECTION COMMENTS

1. Secondary Containment

2. Tank Construction

3. Tank Foundation

4. Tank Bottom

5. Tank Shell

6. Tank Floating Roof

7. Tank Fixed Roof

8. Tank Appurtenances

9. Tank Piping System

10. Fire Protection System

11. Cathodic Protection

12. Coatings

C. FINDINGS AND RECOMMENDATIONS

1. Mandatory

2. Short Term

3. Long Term

APPENDIX A: ENGINEERING CALCULATIONS

APPENDIX B: ENGINEERING DRAWINGS

APPENDIX C: ENGINEERING DATA

APPENDIX D: API STANDARD 653 CHECKLIST FOR TANK INSPECTIONS

APPENDIX E: 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

HLA High Level Alarm

HLCS High Level Control Shutoff

HHLA High-High Level Alarm

LLA Low Level Alarm

LLLA Low-Low Level Alarm

MFL Magnetic Flux Leakage

MT Magnetic Particle Testing

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

STI Steel Tank Institute

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

An API Standard 653 in-service inspection of Tank 24 (Facility 4300), located at Robins AFB, GA was completed on June 13, 2019 to evaluate the tank’s integrity, collect data, and establish a database for future inspections and evaluations. The shell service life is greater than 30 years of remaining shell life under current conditions. Inspection Results are listed in section 4.0.

Recommendations for Compliance with API Standard 653 are listed in section 5.0. Other Recommendations are listed in section 6.0.

Significant Findings (overview):

Mandatory:

1. No Mandatory Finding Noted.

Short Term:

1. The concrete joint sealant of the secondary containment floor has deteriorated and/or disbonded from the concrete. The joint sealant is beyond its useful service life.

2. Some minor hairline cracking was noted on the secondary containment floor.

3. Some of the joint sealant of the secondary containment vertical walls has deteriorated and/or disbonded from the concrete.

4. The containment has two areas of severe settling, one along the eastern containment wall and one near the tank foundation on the east side of the tank. The concrete blocks have separated in these areas by approximately 2-inches. Several other low spots exist in the secondary containment area as well.

5. The sealant between the tank foundation and containment floor has failed around most of the circumference.

6. The 8-inch receipt line has some minor coating failure on the CLA-VAL hardware.

7. Several of the supports associated with the AFFF line have been replaced. In one area, a support has been cut but not replaced. The distance between supports is doubled in this area.

8. The external coating on the tank shell and roof is chalking and discolored. The coating appears to have surpassed its useful service life. The roof plates and several nozzle coatings are covered in mildew.

9. None of the three 36-inch manways on the tank have a davit arm for safe removal of the cover.

Hinges or davit arms are required by API-650 when the cover weighs more than 75lbs.

10. Several supports inside the secondary containment associated with the AFFF line, the cam stripper line, and the receipt line do not have Teflon material between the piping and support.

11. There is no geomembrane boot installed for the 8-inch issue, receipt, or AFFF piping penetrations through the containment floor. Sealant at these penetrations is beginning to deteriorate.

12. The ladder used to access the containment area on the northern side is loose at its connection to the containment floor and wobbles slightly. This access is not typically used.

13. Clearance between the high level alarms and stairway railing does not meet the OSHA required 26-inches. Measurement was 20 inches. There is no platform at the alarms.

14. The tank is not equipped with an NFPA diamond label.

15. The 8-inch receipt line is equipped with a flexible pipe connection not recommended by UFC.

Long Term:

1. The thermal relief system for the 8-inch issue line consists of threaded carbon steel piping, does not have isolation valves, and does not have a test TEE for annual testing.

2. The ¾-inch water draw line does not have a 2-inch DBB valve at the tank, and the piping is threaded and contains several non-lockable ball valves. The associated PST is not grounded and has no vent.

3. The grounding connections to the tank shell are bolted and not exothermically welded.

4. Several piping and conduit supports are welded directly to the tank shell with no reinforcement installed.

5. Supports for the three stairway platforms are welded directly to the shell with no reinforcement installed.

6. The spiral stairway tread reinforcement is welded only at the top and should be completely seal-welded.

7. The previous 2017 inspection report indicates that the AFFF line on the tank is abandoned.

Consideration should be given to removing this abandoned piping if it is not in use. UFC 3-460-01 and NFPA 30 do not require foam for class II liquids.

8. The fixed roof is not equipped with a sample gauge well.

9. Uni-Strut conduit supports located along the fixed roof are loose.

10. Due to paint or lack of use, only 7 of the 11 existing perimeter rim vents were able to be opened. The hatches and their fastening hardware are coated carbon steel. There is also no safety chain located at the mid rail.

11. There is no original manufacturer’s data plate on the tank shell. A repair data plate provided by CAPE, Inc. in 2007 exists.

INSPECTION INFORMATION

Inspection Date: June 4, 2019 Inspection(s) Performed: API-653 In-Service Inspector(s): Daniel Bailey

EQUIPMENT USED

1. Equipment Type: Ultrasonic Thickness Meter

a. Manufacturer: General Electric

b. Model Number: DMS GO+

c. Calibration Method: Two Point Calibration

2. Equipment Type: Surveying Tool

d. Manufacturer: Leica

e. Model Number: 3D DISTO

f. Calibration Method: Manufacturer

STATE REGULATIONS

API-653 In-Service Tank Inspections: N/A API-653 Out-of-Service Tank Inspections: N/A

NOTE: If there are no state regulations for tank inspections, N/A shall reside in-place of the number of years between inspections. If state regulations reside, the recommended future inspections dates shall be based on whichever is more stringent between the STI inspector’s calculations and the state regulations.

PREVIOUS INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: 2002 API In-Service (External) Inspection Date: May 2012

Dec 2013 March 2015

RECOMMENDED FUTURE INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: June 2037 (based on 2007 bottom replacement) API In-Service (External) Inspection Date: June 2024

Signature(s):

Daniel Bailey, API-653 #52607 InterSpec, LLC.

Owner US Air Force Location Robins AFB Facility Number 4300 Tank Number 24 State / Country Georgia, United States City Warner Robins Inspection Date June 4, 2019 Tank Manufacturer Original: Unknown Design Standard API Standard 650 7th Edition (assumed)

Date of Construction Original: 1986 Modified: 2007 by Cape, Inc.

Tank Contents Jet A Tank Serial Number 38683 716 Tank Diameter 112’ 3” (nominal) Shell Height 52’ 3” (nominal) Product Height 45’ 10” (limited by overflow) Tank Capacity 80,000 Barrels Foundation Concrete Ring-Wall

Construction

Bottom 5/16-inch lap-welded plate (per repair design drawing)

Shell

1st Course: ½-inch butt-welded plate, 2nd Course: 3/8-inch butt-welded plate 3rd-6th Course: ¼-inch butt-welded plate

Floating Roof Petrex Aluminum Honeycomb Fixed Roof Lap-Welded supported cone roof w/ 3/16-inch plate

Material

Bottom Carbon Steel, unknown grade Shell Carbon Steel, unknown grade Floating Roof Aluminum Fixed Roof Carbon Steel, unknown grade

Cathodic Protection Impressed Current Interior Coating System Assumed Epoxy Type Coating Exterior Coating System Epoxy/Polyeurathane Level Gauging Enraf ATG, Varec MTG, Ladder/Manual Gauge Well, Vito Water ATG Overfill Protection High Level Control Valve (CLA-VAL)

Piping

Receipt 8" Carbon Steel Issue 8" Carbon Steel Low Suction 4” Carbon Steel Water Draw-Off 3/4" Carbon Steel

Level Alarms & Controls

Description ENRAF ATG High-High Level Alarm: 42-06-00 High-Level Alarm: 41-06-00 Low-Level Alarm: 5-10-08 Low-Low Level Alarm: 2-11-04 High-Level Control Shut- Off:

42-00-00 (CLA-VAL)

Type of Floating Roof Full Contact, Aluminum Honeycomb Floating Pan (Petrex)

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.

An API Standard 653 In-Service (external) inspection was performed for Tank #24 (Facility 4300).

2. Site Information On June 4, 2019 Argus Consulting and our sub-consultant (InterSpec, LLC) performed an API 653 Out-of-Service inspection of Tank #24 (Facility 4300), located at Robins AFB, GA. Robins AFB is the home of Warner Robins Air Logistics Center, the 78th Air Base Wing and more than 60 other units that make up a vital part of the Air Force warfighting team. It is the largest industrial complex in Georgia, employing a workforce of over 25,000 civilians, contractors, and military members. Robins AFB is one of three air force logistics centers.

B. TANK INSPECTION COMMENTS

1. Secondary Containment 40 CFR 112.7(c) states that the entire secondary containment system, “including walls and floor, must be capable of containing oil and must be constructed so that any discharge from a primary containment system ... will not escape containment before cleanup occurs.” 40 CFR 112.8(c)(2) and 40 CFR 112.12(c)(2) state that diked areas must be “sufficiently impervious to contain oil.” The purpose of the secondary containment requirement is to prevent discharges, as described in 40 CFR 112.1(b); therefore, effective secondary containment methods must be able to contain oil until the oil is cleaned up. The secondary containment area consists of concrete floor and concrete vertical walls. An informal containment evaluation was conducted. The containment does appear to be of sufficient size to contain a total tank loss per UFC 3-460-01 Section 8-14.2.1, “The containment area needs to have sufficient capacity to contain the tank contents plus one foot of freeboard. If the containment has the capacity to contain the tank contents plus one foot of freeboard, the containment area is sufficient.” The secondary containment area appears to be properly graded to drain water away from the tank in accordance with NFPA 30. Joint sealant on the containment floor has deteriorated and lost seal with the concrete. Some of the joint sealant on the containment walls has deteriorated and lost seal with the concrete. Piping penetrations through the floor for the 8-inch AFFF, issue, and receipt piping are not designed in accordance with AW 78-24-27, and the sealant at the penetrations has deteriorated.

2. Tank Construction Tank #24 (Facility 4300) is a nominal 80,000 barrel, 112’ 3” diameter by 52’ 3” tall, Jet A, aboveground vertical storage tank. The original construction nameplate is missing. A repair data plate provided by CAPE, Inc. in 2007 is affixed to the tank and is legible. The tank was originally built in 1986 according to the repair data plate, although the original manufacturer is unknown.

3. Tank Foundation The tank rests on a 48-inch high concrete ring-wall foundation. The tank has a liner under the bottom to contain any bottom leakage. The foundation was visually evaluated during the inspection for broken concrete, spalling, cracks, and vegetation against the bottom of the tank. The tank bottom-to-ring-wall sealant was inspected;

it is in satisfactory condition. A shell settlement survey was performed during the inspection in accordance with Appendix B of API Standard 653; it is in satisfactory condition. Settlement results are listed in Appendix A. Sealant between the ring-wall and containment floor has deteriorated.

4. Tank Bottom The tank bottom was not inspected during this in-service inspection. Previous inspection and repair project completion reports indicate the bottom was replaced in 2007 and is a 5/16” lap-welded design.

5. Tank Shell The shell is constructed of carbon steel material with an unknown specification. The shell is a cylindrical design, butt-welded together, consisting of six (6) courses. The shell interior and exterior have a thin film epoxy coating system. The coating was visually inspected for disbonding, adhesion, deterioration, and discoloration. The interior coating of the shell appeared to be in satisfactory condition. The shell was evaluated for remaining metal thickness utilizing ultrasonic technology. The external coating was chalking heavily and was discolored. The external coating appears to have surpassed its useful life. The ultrasonic thickness measurements and thickness measurement locations (TML) are listed in the Shell Plate Thickness Measurements table in Appendix A. A shell service life evaluation performed on all shell courses shows the shell has a remaining life of greater than 30 years under current conditions. The shell service life evaluation is shown in the Shell Service Life Evaluation table in Appendix A. Roundness, plumbness, peaking, and banding of the shell are acceptable. The tank appears to be stable and does not appear to be in danger of overturning or buckling due to high winds or seismic conditions.

6. Tank Floating Roof The tank is equipped with an internal floating roof (IFR). The floating roof is a full contact, aluminum honeycomb floating pan. The overall condition of the roof and secondary wiper seal was visually evaluated and appears to be in satisfactory condition. The roof is level and appears relatively centered in the tank.

7. Tank Fixed Roof The fixed roof is a supported cone roof constructed of carbon steel material of unknown specification. The fixed roof has an epoxy coating system on the interior and exterior. The coating was inspected for disbonding, adhesion, deterioration, and discoloration. The topside coating has a large amount of mildew type staining present. Several areas indicating standing water present after precipitation were noted. The fixed roof was evaluated for remaining metal thickness using ultrasonic technology. The ultrasonic thickness measurements and ultrasonic thickness locations (TML) are listed in the Fixed Roof Plate Thickness Measurements table in Appendix C.

8. Tank Appurtenances

a. Water Draw‐Off System

1) Water Draw-Off Line: The water draw-off piping consists of 3/4-inch threaded stainless steel piping. The line has a ball valve at the shell.

2) Product Saver Tank: The product saver tank (PST) is constructed of stainless steel. The PST is not grounded. The PST is not equipped with a vent.

b. Low Suction System The tank is equipped with a low suction line. The system is composed of 4-inch carbon steel interior piping and a 4-inch shell nozzle with double block and bleed valve. The low suction line ties into the issue line and is provided with a 2-inch camlock stripper connection.

c. Issue Line The 8-inch issue line is carbon steel. The line is protected from overpressure with a thermal relief system. The thermal relief system consists of 3/4-inch threaded carbon steel piping and fittings and does not have a TEE for testing.

d. Receipt Line The 8-inch receipt line is carbon steel. The line is protected from overpressure with a thermal relief system. The thermal relief system consists of 1-inch flanged stainless steel piping and is designed in accordance with AW 78-24-27.

Calibration tags on the valves indicate the next calibration test is due March 2020.

e. Automatic Tank Gauging (Fuel Level) The tank is equipped with an Enraf ATG system for electronic fuel level gauging.

The system is installed through an 8-inch fully slotted aluminum stilling well.

f. Automatic Tank Gauging (Water Level) The tank is equipped with an Enraf Vito ATG system for electronic water level gauging. The Vito water probe is installed through a 4-inch fully slotted aluminum stilling well and is located close to the center of the tank.

g. Mechanical Tank Gauging The tank is equipped with a Varec mechanical tape level gauge for mechanical fuel level gauging. The tape is attached to the floating roof. The system is in functional condition.

h. Tank Sampling\Manual Gauging The tank is equipped with a combination ladder-stilling well installed through a hatch on the fixed roof. The stilling well is fully slotted 8-inch aluminum and is used for manually gauging the tank. The tank is not equipped with a sample gauge well with floating seal and winch in accordance with AW 78-24-27.

i. Level Alarms\High Level Shut‐Off The ENRAF system provides low, low-low, high, and high-high level alarms. The tank does have independent low, low-low, high, and high-high level alarms.

The low level alarm assembly consists of 1-inch welded and flanged stainless steel piping.

The high level alarm assembly and high level shut-off assembly are accessible from the circumferential stairway without a platform. The piping consists of 1-inch welded and flanged stainless steel piping. The assemblies do not have piping extending to the product saver tank.

j. Ladder and Platforms The tank’s fixed roof is accessible by a circumferential stairway mounted on the shell of the tank. The circumferential stairway has a platform for the upper manhole. The floating roof is accessible by an internal ladder through a 36-inch manhole on the fixed roof.

k. Grounding The tank has four (4) grounding straps around the circumference of the tank.

The tank grounding cables are bolted to lugs welded to the shell.

l. Anchoring The tank is not equipped with anchor bolts.

9. Tank Piping System Fuel is received into the tank filtered via underground piping from a commercial terminal. Fuel is issued from the tank via underground piping and Transfer Shed 199 issue filter-separators to the adjacent Tanks 28 and 29.

10. Fire Protection System There are two fire hydrants within 300 feet of this tank. Three AFFF nozzles on the tank are connected by underground piping to an injection point outside the dike.

The tank is equipped with a foam dam on the IFR, and the foam nozzle on the tank does not have a plate at the opening to deflect the foam to the seal area inside the tank. This configuration would direct the foam to the center of the tank and not to a potential fire and could also sink the IFR. Note that UFC 3-460-01 and NFPA 30 do not require AFFF for Class II liquids. Although a foam system is not required for this product, there are no foam chambers or method for mixing the foam solution.

11. Cathodic Protection An impressed current Cathodic Protection (CP) system is installed on this tank. The CP rectifier is manufactured by Universal Rectifiers, Inc. The CP is a model ASAI with Serial # 064086. This unit is a 60 volt 10 ampere air-cooled rectifier unit mounted on the outside wall of the secondary containment. The Watchdog VIP remote monitoring unit (RMU) is used for remote rectifier monitoring application. No issues are reported with the CP system.

12. Coatings The shell interior and exterior have a thin film epoxy coating system. The coating was visually inspected for disbonding, adhesion, deterioration, and discoloration.

The interior coating of the shell appeared to be in satisfactory condition.

The fixed roof has an epoxy coating system on the interior and exterior. The coating was inspected for disbonding, adhesion, deterioration, and discoloration. The topside coating has a large amount of mildew type staining present.

Some appurtenances and hardware on the shell and fixed roof have minor coating failure with associated surface corrosion.

C. FIND

The f inspe

1. M M re o a

2. Sh S d g a

DINGS AND

following in ection:

Mandatory Mandatory fi emain out o r hydraulic

. None.

ate of inspe auge repair

. Seconda

OBSERVAT

deteriora useful ser

CODE REF

containm oil and m containm §§112.8( impervio

RECOMME

and seala adequate of the join foam, pol material conform

RECOMME

nformation i indings incl of service if integrity of indings incl ection (e.g. s rs, grouting, ry Contain TION: The c ated and/or rvice life.

FERENCE: 40

ment system must be con ment system (c)(2) and 1 ous to conta

ENDATION: R

ant within th e to accomm

nt. The back lyurethane as recomme to UFGS 07

ENDATIONS

identifies th lude repairs not accomp f the tank (e ude repairs spot coating etc.).

ment Floor concrete join r disbonded

0 CFR Secti m “includin nstructed so m ... will not 112.12(c)(2 ain oil.”

Remove the he secondar modate a join ker rod shal foam, butyl ended by th 92 00 Joint

S he significan s required th plished. Such e.g. bottom o s that are re gs, drainage r Sealant nt sealant o from the co on 112.7(c g walls and o that any d t escape co

2) state tha e damaged s ry containm nt compress ll be compre rubber foam he sealant m t Sealant req nt findings f hat provide h repairs ar or shell rep equired with e improveme of the second oncrete. The

) states tha d floor, mus discharge fr ntainment at diked are sealant and ment basin. T sion equal t essible rod m, or other manufacture quirements found durin e cause for t re critical to airs).

hin 5 years o ent, calibrat dary contai e joint seala at the entire st be capab rom a prim before clea eas must be install new The sealant to 50 percen stock of pol flexible, no

er. The seala . (Quantity:

ng the tank the tank to o the structu or less from tion, mecha nment floor ant is beyon e secondar le of contai mary anup occur e “sufficient backer rod t shall be nt of the wid lyethylene on-absorptiv ant shall

7800 LF)

ural m the anical r has nd its y ining s.”

tly ds dth ve b c.

. Secondar

OBSERVAT

containm

CODE REF

containm oil and m containm §§112.8( impervio

RECOMME

basin by and a dep or a simil

. Secondar

OBSERVAT

deteriora

CODE REF

containm oil and m containm §§112.8( impervio

RECOMME

and seala adequate of the join foam, pol material conform ry Containm TION: Some ment floor.

FERENCE: 40

ment system must be con ment system (c)(2) and 1 ous to conta

ENDATION: R

grinding in pth of at lea lar approve ry Containm TION: Some ated and/or

FERENCE: 40

ment system must be con ment system (c)(2) and 1 ous to conta

ENDATION: R

ant within th e to accomm

nt. The back lyurethane as recomme to UFGS 07 ment Floor Cr minor hair

0 CFR Secti m “includin nstructed so m ... will not 112.12(c)(2 ain oil.”

Repair all ex a V-shape p st ¼-inch a ed sealant. (Q ment Wall Joi e of the joint r disbanded 0 CFR Secti m “includin nstructed so m ... will not 112.12(c)(2 ain oil.”

Remove the he secondar modate a join ker rod shal foam, butyl ended by th 92 00 Joint racking line crackin on 112.7(c g walls and o that any d t escape co

2) state tha xposed crac pattern with nd sealing w Quantity: 45 int Sealant t sealant on from the co on 112.7(c g walls and o that any d t escape co

2) state tha e damaged s ry containm nt compress ll be compre rubber foam he sealant m t Sealant req ng was note

) states tha d floor, mus discharge fr ntainment at diked are cks in the se h at least ¼-with flexible

5 LF)

n the second oncrete.

) states tha d floor, mus discharge fr ntainment at diked are sealant and ment basin. T sion equal t essible rod m, or other manufacture quirements d on the sec at the entire st be capab rom a prim before clea eas must be econdary co -inch width e urethane ( dary contain at the entire st be capab rom a prim before clea eas must be install new The sealant to 50 percen stock of pol flexible, no

er. The seala . (Quantity:

condary e secondar le of contai mary anup occur e “sufficient ontainment h at the surfa (e.g. Sikaflex nment walls e secondar le of contai mary anup occur e “sufficient backer rod t shall be nt of the wid lyethylene on-absorptiv ant shall

60 LF)

y ining s.”

tly ace x 1c) s has ining s.”

tly ds d

. Secondar

OBSERVAT

the easte side of th approxim containm

CODE REF

containm oil and m containm §§112.8( impervio

RECOMME

drain liqu ry Containm TION: The c ern contain he tank. The mately 2-in ment area a

FERENCE: 40

ment system must be con ment system (c)(2) and 1 ous to conta

ENDATION: R

uid away fro ment Settlem containmen ment wall a e concrete ches. Sever s well.

0 CFR Secti m “includin nstructed so m ... will not 112.12(c)(2 ain oil.”

Repair the c om the tank ment nt has two a and one ne blocks hav ral other low on 112.7(c g walls and o that any d t escape co

2) state tha containmen k and towar areas of sev ear the tank e separated w spots exi

) states tha d floor, mus discharge fr ntainment at diked are nt at the sett ds the drain vere settlin k foundatio d in these a ist in the se at the entire st be capab rom a prim before clea eas must be tled areas an n sump. (Qu ng, one alon n on the ea areas by econdary e secondar le of contai mary anup occur e “sufficient nd regrade uantity: 2 ar ng ast y ining s.”

tly to reas) e f.

. Secondar

OBSERVAT

floor has

CODE REF

containm oil and m containm §§112.8( impervio

RECOMME

and seala adequate of the join foam, pol material conform

Receipt L

OBSERVAT

CLA-VAL

CODE REF

Coating o

RECOMME

tank appu coating sy galvanize ry Containm TION: The s s failed arou

FERENCE: 40

ment system must be con ment system (c)(2) and 1 ous to conta

ENDATION: R

ant within th e to accomm

nt. The back lyurethane as recomme to UFGS 07

Line Coating TION: The 8

L hardware

FERENCE: UF

of Steel Stru

ENDATION: M

urtenances.

ystem or eq ed surfaces.

ment Floor an sealant betw und most o 0 CFR Secti m “includin nstructed so m ... will not 112.12(c)(2 ain oil.”

Remove the he secondar modate a join ker rod shal foam, butyl ended by th 92 00 Joint g 8-inch recei

FC 3-460-0

uctures).

Mechanicall . Repairs sh quivalent. D (Quantity:

nd Foundati ween the ta f the circum on 112.7(c g walls and o that any d t escape co

2) state tha e damaged s ry containm nt compress ll be compre rubber foam he sealant m t Sealant req ipt line has

3 Section 8 ly clean and hould be acc o not paint

5 SF)

ion Sealant ank founda mference.

) states tha d floor, mus discharge fr ntainment at diked are sealant and ment basin. T sion equal t essible rod m, or other manufacture quirements some mino

8-3.1 and U d recoat area complished stainless st ation and co at the entire st be capab rom a prim before clea eas must be install new The sealant to 50 percen stock of pol flexible, no

er. The seala . (Quantity:

or coating f

FGS 09 97.

as of coatin using an ep teel, aluminu ontainment e secondar le of contai mary anup occur e “sufficient backer rod t shall be nt of the wid lyethylene on-absorptiv ant shall

360 LF)

failure on th

13.27 (Exte ng failure on poxy based um, or t ining s.”

tly ds he erior n the g h

. AFFF Line

OBSERVAT

been rep distance the conta

CODE REF

supports around 2 containm oil and m containm §§112.8( impervio

RECOMME

Seal the a support, . External

OBSERVAT

discolore plates an

CODE REF

Coating o

RECOMME

tank shel epoxy ba 10,000F) e Supports TION: Sever placed. In on between su ainment flo FERENCE: Se , hangers, a

20 feet. 40 C ment system must be con ment system (c)(2) and 1 ous to conta

ENDATION: R

areas where 18 sealed su

Shell and Ro TION: The e

ed. The coat nd several no

FERENCE: UF

of Steel Stru

ENDATION: M

ll, roof, and sed coating ral of the su ne area, a s upports is d oor and are ee API RP 57 nd anchors CFR Section m “includin nstructed so m ... will not 112.12(c)(2 ain oil.”

Replace the e the suppor upports) oof Coating external coa ing appears ozzle coatin

FC 3-460-0

uctures).

Mechanicall appurtenan g system or e upports ass upport has doubled in not sealed

74 Section 8 ), the typica n 112.7(c) s g walls and o that any d t escape co

2) state tha support on rts penetrat ating on the s to have su ngs are cove 3 Section 8 ly clean and nces. Repair equivalent.

sociated wi s been cut b this area. T /filled in.

8.2 (Proper al support states that d floor, mus discharge fr ntainment at diked are n the AFFF li te the conta tank shell a rpassed its ered in mild 8-3.1 and U d recoat area rs should be (Quantity: S ith the AFF but not repl The suppor position an spacing for the entire s st be capab rom a prim before clea eas must be ine where it ainment floo and roof is c useful serv dew.

FGS 09 97.

as of coatin e accomplish Shell- 18,50

F line have laced. The rts penetrat nd function r this pipe i secondary le of contai mary anup occur e “sufficient t is missing or.(Quantity chalking and ice life. The

13.27 (Exte ng failure on hed using a

00 SF, Roof-te of is ining s.”

tly y: 1 d is e roof erior n the n i.

j.

Manways

OBSERVAT

for safe r

CODE REF

shall hav be equip manhole the shell Detail 3.

RECOMME

5.8.3.5 an

Secondar

OBSERVAT

with the A material crevice/c

CODE REF

574 Secti and UFC for piping s TION: None emoval of th

FERENCE: AP

ve two hand ped with ei cover plat without a

ENDATION: I

nd AW 78-2 ry Containm TION: Sever AFFF line, t between th contact corr

FERENCE: AP

ion 8.2 (Pro 3-460-01, 9

ENDATION: I

g in the seco e of the thre he cover.

PI STD 650

dles. Those ither a hing

e. The davi reinforcing nstall davit 24-27 Draw ment Piping ral supports the cam strip he piping an rosion witho PI RP 574 Se oper position 9-3.2. See a nstall Teflo ondary cont e 36-inch m

Section 5.8 covers wei ge or davit t support a g plate.” Als t arms in ac wing D.10 D s inside the pper line, an d support. T out adequat ection 7.4.14 n and funct also AW 78-n material b tainment ar manways on

8.3.5 states ighing mor to facilitate arm shall no so, AW 78-2 ccordance w Detail 3. (Qu secondary c nd the recei These areas te isolation 4 (Contact P ion of supp

-24-27 Draw between the rea. (Quant n the tank ha s, “Shell ma re than 34 k e the handl ot be welde 24-27 Draw with API ST uantity: 3) containmen ipt line do n s are subject strips.

Point Corro orts, hanger wings CD.11 e pipe and p ity: 28 supp ave a davit a anhole cove kg (75 lb) s ling of the ed directly wing D.10

TD 650 Sect nt associated not have Tef t to sion) API R rs, and anch

1 and CD.13 pipe suppor ports) arm ers hall to tion flon

P hors) rts k l.

k. Secondar

OBSERVAT

receipt, o these pen

CODE REF

CFR 112.

RECOMME

through t (Quantity

Secondar side is loo access is

CODE REF

ladder. (Q ry Containm TION: There or AFFF pipi netrations is

FERENCE: 40

1(b) and AW

ENDATION: I

the containm y: (3) 8-inch ry Containm TION: The la ose at its co not typicall FERENCE: Ge

ENDATION: S

Quantity: 1) ment Piping P e is no geom ing penetrat s beginning

0 CFR 112.7

W 78-24-27 Install seale ment floor f h penetratio ment Access L adder used onnection to ly used.

eneral Obse Secure the c

Penetration membrane b tions throug g to deterior 7(c); 40 CFR 7 Drawing C ed geomemb for the 8-inc ons)

Ladder to access th o the contain ervation/Sa connection a ns boot installe gh the conta rate.

R 112.8(c)(2

CD.08.

brane boots ch issue, rec he containm nment floor afety at the base ed for the 8-ainment flo

2), 40 CFR 1

s at the pene ceipt and AF ment area on r and wobbl of the conta

-inch issue, oor. Sealant

12.12(c)(2) etrations FFF piping.

n the northe les slightly.

ainment acc at

), 40 ern This cess m n

m. High Leve

OBSERVAT

not meet platform

CODE REF

the stairw

. Tank Sign

CODE REF

hazard id

RECOMME

accordan

No Photog el Alarm Cle TION: Cleara the OSHA r at the alarm

FERENCE: OS

ENDATION: E

way clearan nage TION: The t

FERENCE: AW

dentificatio

ENDATION: P

nce with NF graph Availab earance ance betwee required 26 ms.

SHA 29 CFR

Extend the s nce requirem tank is not e W 78-24-27 on system la Provide haz

FPA 704. (Q

ble en the high -inches. Me

R 1910.25 r stairway tre ments of OS equipped wi 7 Drawing abeling in a zard identif

Quantity: 1) level alarm easurement requires a c eads at the h

HA 29 CFR

ith an NFPA D.13 Detail accordance fication sys ms and stairw was 20 inch clear width high level al

1910.25. (

A diamond la l 3 Note 4) e with NFPA stem labelin way railing hes. There i h of 26 inch larms to me Quantity: 1 abel.

“Provide

A 704.”

ng in does is no es.

eet 1) o p

. Roof Cent

OBSERVAT

screen an

CODE REF

with corr size of (1 Detail 1 a

RECOMME

the cente 24-27 Dr

. Flexible P not recom

CODE REF

RECOMME

differenti flexibility anticipat joints. Do exceed di ter Vent TION: The ce nd is not cor

FERENCE: AP

rosion-resi

19 mm [3/4 and 2.

ENDATION: I

er roof vent rawing D.09

Pipe Connec TION: The 8 mmended b

FERENCE: UF

ENDATION: E

ial, and seis y in piping, a ed settleme o not use co ifferential s enter vent o rrosion resi PI 650 Sect stant coars

4 in.] nomin

Install a cor t in accorda 9 Detail 1 a ction on Rec -inch receip y UFC.

FC-3-460-0

Estimate the smic induced appurtenan ents. Accom orrugated or ettlement v on the fixed istant.

tion 5.8.5.5, se mesh bir nal opening rrosion-resi ance with A and 2. (Quan ceipt Line pt line is equ

01 Section 8 e magnitud

d) as part o nces, and oth mplish flexib r bellows ty values given d roof is equ

, “All free v rd screens o g)” and AW istant coars API 650 Sec ntity: 1) uipped with

8-8.5 Item ( es and rates f the design her systems bility by usin ype expansi n in UFC 3-2 uipped with vents shall b of a maximu

W 78-24-27 D se mesh bir ction 5.8.5.5 h a flexible t

(i) s of settlem

n. Provide ad s to accomm ng pipe offs on compens 20-10N.

too fine of a be provided um opening Drawing D.

rd screen o 5 and AW 7 type spool p ment (uniform dequate modate ets or ball sators. Do n a g .09 on 78-piece m, not

3. L Lon wit app ins upg a b

th DoD Tank plicable crit pection. (e.g grades, addi

. Issue Lin

OBSERVAT

threaded test TEE

CODE REF

Drawing

RECOMME

issue line 78-24-27

b. Water D the tank, valves. Th

CODE REF

RECOMME

AW 78-2

(Quantity dings includ k Standards teria. Repair

g. coatings i itional man ne Thermal TION: The t d carbon ste for annual t

FERENCE: UF

D.10 Detai

ENDATION: M

e in accord 7 Drawing D raw Line, P TION: The ¾ and the pip he associate

FERENCE: AW

ENDATION: M

4-27 Drawi y: 1 water d de repairs/u s (UFC 3-46 rs that may internal/ext ways etc.).

l Relief Sys thermal reli el piping, do testing.

FC 3-460-0

il 4.

Modify the ance with U D.10 Detail

Piping, and ¾-inch wate ping is threa ed PST is no W 78-24-27

Modify the W ng D.13 Det draw system upgrades tha

60-01, UFC 3

be deferred ternal, plan stem ef system fo oes not hav

1 Section 3 existing th

UFC 3-460-

4. (Quantit d PST er draw line aded and co ot grounded 7 Drawing D Water Draw tail 5. Instal m) at are to be 3-460-03, A d until the n nned bottom or the 8-inch ve isolation v

3-3.1.2 Item ermal relie -01 Section ty: 1 TRV s does not ha ntains seve d and has no D.13 Detail 5 w-off system ll a ground c considered

AW 78-24-2

next schedul m repairs, fla h issue line valves, and m (j) and AW ef system fo 3-3.1.2 Ite ystem) ave a 2-inch eral non-lock o vent.

5.

m to be in acc cable and ve d for compli

27) or other led internal at bottom ta consists of does not ha

W 78-24-27 or the 8-inc m (j) and A h DBB valve kable ball cordance w ent to the P iance r l ank ave a ch

AW-

e at with

ST.

c

. Tank Gro

OBSERVAT

clip and h 78-24-27

CODE REF

650 Sect

RECOMME

install re ED.02 De removed ground. (

d. Piping an tank shel

CODE REF

with AW ounding TION: The t have no rein 7 Drawing E

FERENCE: AW

ion 5.8.11.3

ENDATION: E

inforcemen etail 2. Note where the

(Quantity: 4 nd Conduit TION: Sever ll with no re

FERENCE: AW

ENDATION: M

78-24-27. ( tank ground nforcement

ED.02 Detail W 78-24-27 3).

Exothermic nt at the she : If repairs a cable bolts

4) t Supports ral piping an einforcemen W 78-24-27 Modify the p (Quantity: 2 ding straps a plates or gr l 2.

7 Drawing ally-weld th ll in accorda are elected n to the lug to nd conduit nt installed.

7 Drawing D piping and c

21 supports) are bolted t rounding lu

ED.02 Deta he groundin ance with A not to be do o provide a supports ar

D.10 Detail 5 conduit sup o the tank s ug installed a ail 2. (See a ng cables to

AW 78-24-2

one, the pain better conn re welded d

5 and D.07 D pports to be shell mount as shown in lso API STD the lug and 7 Drawing nt should be nection to th directly to th

Detail 1.

in accordan ted n AW

D d nce f.

. Stairway

OBSERVAT

the shell

CODE REF

5.7.3.

RECOMME

Note: Rei and weld

Spiral St top and s

CODE REF

D.11 Det

RECOMME

stairway attachme Section 5 beyond s y Platform TION: Supp with no rein

FERENCE: AW

ENDATION: I

inforcement d spacing to tairway TION: The 6 should be co

FERENCE: AP

y treads in a ents to the

5.1.3.7. Not

stair tread a y: 66 )

Supports orts for the nforcement W 78-24-27

Install reinf t pad to ext meet API St

66 spiral sta ompletely se PI Standard tandard 65 Install reinf accordance shell shall b e: Reinforc and weld sp three stairw t installed.

7 Drawing forcement p end a minim tandard 650 airway tread eal-welded.

d 650 Sectio 50 Section 5 forcement with AW 7 be seal-wel cement pad pacing to m way platfor

D.11, API S

pads for the mum of 2 in 0 Section 5.

d reinforcem on 5.1.3.7, A 5.7.3.

plates to th

78-24-27 Dr lded in acco is to exten meet API Sta rms are weld

Standard 65 spiral stairw nches beyon .7.3. (Quant ment is weld

AW 78-24-

he shell beh rawing D.1 ordance wi nd a minimu andard 650 ded directly

50 Section way treads.

nd stair trea tity: 3 platfo ded only at

27 Drawin hind the 1 Detail 3.

ith API 650 um of 2 inc 0 Section 5.

y to orms the

All hes .7.3.

. AFFF Lin

OBSERVAT

line on th this aban require f inside th to the ar potential

CODE REF

RECOMME

the area o if it will n

h. Fixed Ro

CODE REF

D.07 Det

RECOMME

AW 78-2

ne TION: The p he tank is a ndoned pip foam for cla he tank, but ea of the se l fire and co FERENCE: Ge

ENDATION: M

of the seal a not be used.

oof Sample TION: The f

FERENCE: UF

tail 2.

ENDATION: I

4-27 Draw y: 1) previous 20 abandoned.

ing if it is n ass II liquid there is no eal. This ma ould sink th eneral Obse Modify the A and not the t (Quantity:

Gauge Wel fixed roof is

FC 3-460-0

Install an 8 wing D.07 De

017 inspect Considera not in use. U

ds. Note tha o deflecting ay cause the he floating ervation AFFF piping tank center 1 ) ll s not equip 1 Table 8-1

-inch samp etail 2 and tion report tion should

UFC 3-460-

at a foam da g plate at th e foam to g roof.

g at the tank

r. Consider r ped with a 1 Item (s) a ple gauge w

UFC 3-460

indicates t d be given t 01 and NFP am exists o he shell to d gather away k to ensure removing th sample gau and AW 78-well in accor -01 Table 8 that the AFF to removing PA 30 do no n the IFR direct the fo y from a foam reach he AFFF pip uge well.

-24-27 Draw rdance with 8-1 Item (s)

FF

ot oam es ing wing i.

j.

Fixed Ro

OBSERVAT

loose.

CODE REF

8-11 req corrosion roof in ac

Mid‐Rail circulatio equipped inspectio

CODE REF

intermed members edge of t that is at intermed cannot p

RECOMME

handrail opening requirem (Quantity oof Conduit TION: Uni-S

FERENCE: AP

uire tank a n streaking

ENDATION: S

ccordance w l at Perime TION: The r on vent/ins d with safet on hatches

FERENCE: 29

diate vertic s are instal the guardra t least 21 in diate railing ass through

ENDATION: I

posts abov of the circu ment for int y: 11 vents t Supports Strut condu

PI 650, par attachments g.

Seal-weld t with API 65 ter Rim Ve roof perime spection ha ty chains be are frozen

9 CFR 1910

cal member led betwee ail system a nches (53 cm gs shall be h any open Install a gal ve the circu ulation vent termediate uit supports agraph 5.1.

s (appurten he 9 condu 50 and UFC ents eter mid-ra atch is insta etween the and unable

0.29(b)(2), rs, solid pan en the walk as follows w

m) high.” T provided su ing.

lvanized or ulation vent t/inspectio railing. Rep s located al

.3.7(a) and nances) to b uit supports C 3-460-01.

ailing system alled. These e posts. Mos e to be open “midrails, s nels, or equ king-workin when there The industry uch that a 2 r stainless s t inspection on hatch an place the fr long the fix

UFC 3-460

be seal-wel s located al (Quantity:

m is cut at a e locations st of the lat n/closed.

screens, me uivalent inte ng surface a is not a wa y general r 21-inch dia steel safety n hatches. T nd still prov rozen latch xed roof are

0-01, parag lded to inhi ong the fix : 9 supports area where are not tches for th esh, ermediate and the top all or parap ule is that ameter sphe y chain betw This will all vide the es on the v raph ibit ed s) e the et ere ween low ents.

kk. Manufac shell. A r

CODE REF

RECOMME

10.1. (Qu cturer’s Dat TION: There repair data

FERENCE: AP

ENDATION: I

uantity 1) ta Plate e is no origi plate provi

PI STD 650

Install a dat inal manufa ided by CAP Section 10.

ta plate in ac acturer’s da PE, Inc. in 2 .1.

ccordance w ata plate on 2007 exists with API ST n the tank s.

D 650 Secti on

Appendix A

Engineering Calculations

1. Shell Service Life Evaluation

2. Shell Settlement Evaluation

Shell Service Life Evaluation

Where:

t min = minimum acceptable shell thickness for each course, in inches; however, t min shall not be less than 0.1 inch for any tank course.

t nom = nominal shell thickness, in inches.

t act = current measured shell thickness, excluding pits and corrosion, in inches.

t prev = previous measured shell thickness, excluding pits and corrosion or t nom , in inches.

D = nominal diameter of the tank, in feet.

H = height from the bottom of the shell course under considerations to the established maximum liquid level, in feet.

H c = calculated safe fill height, in feet, for the current product.

G = specific gravity of the contents.

Y = specified minimum yield strength of the plate; use 30,000 pounds per square inch if not known (N/A for riveted tanks).

T = smaller of the specified minimum tensile strength of the plate or 80,000 pounds per square inch; use 55,000 psi if not known (N/A for riveted tanks).

S = The maximum allowable stress, in pounds per square inch. For welded tanks, use the smaller of 0.80Y or 0.429T for the bottom and the second course or the smaller of 0.88Y or 0.472T for all other courses. For riveted tanks, use S =21,000 psi. For elevated temperatures above

200OF, the maximum allowable stress shall be the smaller of 2/3 the minimum yield strength multiplied by the M-factor (M) of API Standard 650 Appendix M or the product design stress value listed in Table M-1a or M-1b of API Standard 650.

E = original joint efficiency for the tank. Use Table 4-2 from API Standard 653 if original E is unknown; E =1.0 when evaluating the retirement thickness in a corroded plate, when away from welds or joints by at least the greater of one inch or twice the plate thickness. For riveted tanks, use E =1.0 for shell plates when greater than 6 inches from rivets; use the value of E from API Standard 653 Table 4-3 when within 6 inches of rivets.

L r = remaining life of the shell, in years.

C r = shell corrosion rate, in inches per year.

I ut = inspection interval for the next ultrasonic inspection, in years (not to exceed 15 years).

I v = inspection interval for the next visual external inspection, in years (not to exceed 5 years).

Y = years between the previous measured shell thickness (t prev ) and the current measured shell thickness (t act ), in years.

The maximum inspection intervals are determined by the most restrictive shell course in regard to the remaining life and the corrosion rate calculations for each shell course using the following formulas:

tmin =

2.6(H−1)DG

SE

Lr = tact − tmin

Cr Cr = tprev − tact Y Iut = tact − tmin 2Cr

Iv = tact − tmin

4Cr

1) Minimum Required Thickness

D = 112 feet

G = 0.82

Y = 33 years

Course No.

Plate Specification

Course Height (feet)

Product Height (feet) (H )

Maximum Allowable

Stress (psi) (S )

Joint Efficiency

(E )

Minimum Acceptable Thickness (inches) (t min )

Previous Measured Thickness (inches) (t prev )*

Current Measured Thickness (inches)

(t act )

1 Unknown 9.92 45.83 23,600 1.00 0.454 0.480 0.472 2 Unknown 10.00 35.91 23,600 1.00 0.353 0.375 0.383 3 Unknown 10.00 25.91 26,000 1.00 0.229 0.313 0.286 4 Unknown 10.00 15.91 26,000 1.00 0.137 0.250 0.249 5 Unknown 6.00 5.91 26,000 1.00 0.100 0.250 0.248 6 Unknown 6.25 0.00 26,000 1.00 0.100 0.250 0.248

*The t prev values were based on t nom .

0.000

0.050

0.100

0.150

0.200

0.250

0.300

0.350

0.400

0.450

0.500

0.550

1.000 2.000 3.000 4.000 6.000

In ch es

Course

Thickness Graph tprev tact tmin

2) Corrosion Rate, Remaining Life and Inspection Intervals

Course No.

Corrosion Rate

(in./yr) (C r )

Remaining Life

(years) (L r )

Next Visual

Inspection (years)

(I v )

Next Ultrasonic Thickness Inspection

(years) (I ut )

1 0.00024 75 5 15 2 0.0002* 148 5 15 3 0.00080 71 5 15 4 0.00003 3698 5 15 5 0.00006 2442 5 15 6 0.00006 2442 5 15

* Let C r =0.0002 inches per year for calculation purposes.

Note: The engineering data used to calculate in-service period of operation (Remaining Life) assumes the tank remains in the same service and all corrosion rates remain constant. The maximum safe fill height for the tank is not limited other than by the established maximum operating liquid level and any other appurtenance such as overflow, vents, or firefighting system.

0.00000

0.00010

0.00020

0.00030

0.00040

0.00050

0.00060

0.00070

0.00080

0.00090

1 2 3 4 5 6

In ch es P er Y ea r

Course

Course Corrosion Rate Graph

Corrosion Rate

3) Projected Thickness Chart and Graph

Course #1:

Year Thickness tmin 2019 0.472 0.454 2024 0.471 0.454 2029 0.470 0.454 2039 0.467 0.454 2049 0.465 0.454

*based on same service and corrosion rates.

Course #2:

Year Thickness tmin 2019 0.383 0.353 2024 0.382 0.353 2029 0.381 0.353 2039 0.379 0.353 2049 0.377 0.353

*based on same service and corrosion rates.

Current Thickness:

Current Thickness:

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)* Anticpated Thickness (20 yrs)* Anticpated Thickness (30 yrs)*

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)* Anticpated Thickness (20 yrs)* Anticpated Thickness (30 yrs)*

0.400

0.450

0.500

2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049

In ch es

Year

Course #1 Projected Thickness Graph

Thickness tmin

0.300

0.350

0.400

2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049

In ch es

Year

Course #2 Projected Thickness Graph

Thickness tmin

Course #3:

Year Thickness tmin 2019 0.286 0.229 2024 0.282 0.229 2029 0.278 0.229 2039 0.270 0.229 2049 0.262 0.229

*based on same service and corrosion rates.

Course #4:

Year Thickness tmin 2019 0.249 0.137 2024 0.249 0.137 2029 0.249 0.137 2039 0.248 0.137 2049 0.248 0.137

*based on same service and corrosion rates.

Anticpated Thickness (20 yrs)* Anticpated Thickness (30 yrs)*

Anticpated Thickness (20 yrs)* Anticpated Thickness (30 yrs)*

Current Thickness:

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)*

Current Thickness:

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)*

0.000

0.050

0.100

0.150

0.200

0.250

0.300

0.350

2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049

In ch es

Year

Course #3 Projected Thickness Graph

Thickness tmin

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049

In ch es

Year

Course #4 Projected Thickness Graph

Course #5:

Year Thickness tmin 2019 0.248 0.100 2024 0.248 0.100 2029 0.247 0.100 2039 0.247 0.100 2049 0.246 0.100

*based on same service and corrosion rates.

Course #6:

Year Thickness tmin 2019 0.248 0.100 2024 0.248 0.100 2029 0.247 0.100 2039 0.247 0.100 2049 0.246 0.100

*based on same service and corrosion rates.

Anticpated Thickness (20 yrs)* Anticpated Thickness (30 yrs)*

Anticpated Thickness (30 yrs)*

Current Thickness:

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)*

Current Thickness:

Anticpated Thickness (5 yrs)* Anticpated Thickness (10 yrs)* Anticpated Thickness (20 yrs)*

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049

In ch es

Year

Course #6 Projected Thickness Graph

Thickness tmin

0.000

0.050

0.100

0.150

0.200

0.250

0.300

2019 2021 2023 2025 2027 2029 2031 2033 2035 2037 2039 2041 2043 2045 2047 2049

In ch es

Year

Course #5 Projected Thickness Graph

Shell Settlement Evaluation

S max = maximum permissible out-of-plane deflection, in feet.

L = ΠD /N = arc length between measurement points, in feet.

D = tank diameter, in feet N = number of survey points.

Y = yield strength, in pounds per square inch (psi).

E = young's modulus, in pounds per square inch (psi) H = tank height, in feet

D = 112 feet N = 12 L = 3.14(112)/12 = 29.3215 feet Y = 29 psi E = 29,000,000 psi H = 52.2 feet

L 2 = 859.7522 square feet

11(859.7522)(30,000) 2(29,000,000)(52.2)

1) Maximum Permissible Out-of-Plane Deflection Calculation

S max = = 0.0937 feet

𝑆𝑚𝑎𝑥 ൌ 11𝐿ଶ𝑌

2𝐸𝐻

|S i | = U i - (1/2U i-1 + 1/2U i+1 ) Where:

|S i | = magnitude of the calculated out-of-plane deflection, in feet.

U i = Out-of-Plane settlement of point "i ", in feet

(+) when above cosine curve (-) when below cosine curve

Point Actual Curve

Fit U i U i+1 U i-1 S i |S i |

1 0.00781 0.00000 0.00781 0.00468 0.00729 0.00729 0.00183 2 0.00781 0.00052 0.00729 0.00781 0.00326 0.00326 0.00176 3 0.00521 0.00195 0.00326 0.00729 -0.00130 -0.00130 0.00026 4 0.00260 0.00391 -0.00130 0.00326 -0.00326 -0.00326 0.00130 5 0.00260 0.00586 -0.00326 -0.00130 -0.00468 -0.00468 0.00026 6 0.00260 0.00729 -0.00468 -0.00326 -0.00521 -0.00521 0.00045 7 0.00260 0.00781 -0.00521 -0.00468 -0.00468 -0.00468 0.00052 8 0.00260 0.00729 -0.00468 -0.00521 -0.00586 -0.00586 0.00085 9 0.00000 0.00586 -0.00586 -0.00468 -0.00391 -0.00391 0.00156

10 0.00000 0.00391 -0.00391 -0.00586 0.00065 0.00065 0.00130 11 0.00260 0.00195 0.00065 -0.00391 0.00468 0.00468 0.00026 12 0.00521 0.00052 0.00468 0.00065 0.00781 0.00781 0.00045

R 2 = 0.62 Note: Settlement evaluation must be done using the arc length method.

1) Out-of-Plane Deflection Calculation

Shell Settlement Graph

9 10

1 2

4 5 6 7 8

0.005