api-653 internal tank inspection evaluation - · PDF fileAPI-653 INTERNAL TANK INSPECTION EVALUATION Tank No: 2 September 23, 2015 Chouteau, OK Grand River Dam Authority TC9338

This document is intended for the sole use of Tank Consultants, Inc. and its customers. Any unauthorized reproduction of this document is prohibited. © 2014

Tank Consultants, Inc. A Division of TEAM® Team Industrial Services

4333 West 21st Tulsa, OK 74107 Phone (918) 583-3968

www.tank-consultants.com [email protected]

API-653 INTERNAL TANK INSPECTION EVALUATION MFL

Revision 0 Dated 10.14.15

Tank No: 2 Product Service: Unknown

Inspection Date September 23, 2015 Grand River Dam Authority

Chouteau, OK

Job TC9338

Inspectors: S. Saxbury (API-653 #50761), A. Majors and S. Barrows

Reviewed By

Terry Wach

PE, API-653 #50849

http://www.teamindustrialservices.com/

http://www.tank-consultants.com/

mailto:[email protected]

http://maps.google.com/maps?t=h&q=Chouteau,+OK+Grand+River+Dam+Authority

API-653 INTERNAL TANK INSPECTION EVALUATION Tank No: 2 September 23, 2015 Chouteau, OK Grand River Dam Authority

TC9338 This document is intended for the sole use of Tank Consultants, Inc. and its

customers. Any unauthorized reproduction of this document is prohibited. © 2015 Page 2 of 9

Revision History

Date No Revision

10.14.15 0 Original Report Issued




Table of Contents Revision History ......................................................................................................................... 2

Table of Contents ....................................................................................................................... 3

Tank Data .................................................................................................................................. 4

Evaluation Summary .................................................................................................................. 5

General ................................................................................................................................... 5

Foundation ............................................................................................................................. 5

Bottom .................................................................................................................................... 6

External Shell ......................................................................................................................... 7

Internal Shell ........................................................................................................................... 7

Access Structures ................................................................................................................... 8

Appendix .................................................................................................................................... 9

Standard Field Report

Calculations

Survey

Bottom Corrosion Evaluation

Fill Height Shell Corrosion Rate Evaluation

Equipment Calibration

TCI Equipment and Calibration Log

Photographs




Tank Data

Description [Units] Tank Type Vertical GPS Location [Latitude Longitude] Nominal Diameter/Width [FT] 34.00 Nominal Height [FT] 24.17 Fill Height [FT] 24.17 Nominal Capacity 3,571 BARRELS Year Built 1979 Built By Unknown Construction Standard API-650 6th Name Plate Information Product Stored Unknown Product Specific Gravity 1.00 Product Flash Point [Degrees Fahrenheit] Flashpoint Pumping In Rate [Barrels/Hour] Pumpinrate Pumping Out Rate Pumpoutrate Foundation Concrete Ringwall Bottom Construction Welded Bottom Installation Date Bottom Slope Cone Up Bottom Coating None Shell Construction Welded Shell Material A283-C Fixed Roof Type Dome Floating Roof Type None Scope of Work - Inspection Type(s) INTERNAL, MFL




Evaluation Summary General

Shell Coupling G had dry product staining. The fitting should be removed, a thread sealant applied, and the fitting replaced.

There was a wet product stain on the bottom extension on the southeast side of the tank. If the tank bottom is to be replaced, then no further corrective action is required. If the tank bottom is not to be replaced, the area on the internal cornerweld should be blasted, cleaned and inspected.

The inspection interval is 5 years for external inspections. The next external inspection should be performed by September of 2020.

The inspection interval is 20 years for internal inspections. The next internal inspection should be performed by September of 2035.

Foundation

The tank was surveyed internally. The details of that survey can be found in the Appendix. The settlement data shows the tank to be 0.48 inches out of level with the low point located at or near Survey Point 8 or 93.46 feet counter-clockwise from Survey Point 1. Survey Point 1 was located three feet counter-clockwise from Wwest Manway A, and the survey proceeded counter-clockwise around the tank shell perimeter. The largest out-of-plane settlement was 0.14 inches. A maximum permissible out-of-plane settlement of 0.50 inches was calculated per API-653 Appendix B.3.2.1. None of the survey points exceed this value. No corrective action recommended.

The tank bottom near the shell was inspected for bulges, ridges, sags and edge settlement that might indicate areas of excessive stress. Because the tank shell does not sit on a grade foundation, settlement near the shell was evaluated per API-653, Appendix B, Sections B.3.3 and the associated footnote. The edge settlement at Radials 1, 3, 4, 6, 7 and 8 exceeded 3/8 inches per foot. Radials 1, 6, 7 and 8 were acceptable and did not require corrective action. The tank bottom welds within 13 feet on either side of Radials 3 and 4 and within 5 feet of the shell should be examined using magnetic particle or dye penetrant testing.




There was an excessive amount of vegetation growing around the tank. The vegetation should be removed.

Bottom

An extremely limited visual inspection of the tank bottom was performed to locate topside pits 0.070 inches deep and deeper in the bottom plates and 0.055 inches deep and deeper in the critical zone (within three inches of the shell) for a 5-year inspection interval. Areas of corrosion below the thresholds were found in Bottom Plates 9 and 10. The visual inspection could not be completed due to an excessive amount of dirt and product residue. Consideration should be given to replacing the tank bottom. Alternatively, if the bottom is not replaced, the bottom should be blasted, cleaned, and inspected for topside corrosion. Topside pits with 0.135 inches or less remaining wall (0.070 deep and deeper) outside the critical zone should be repaired. Topside pits with 0.155 inches or less of remaining wall (0.055 inches deep and deeper) inside the critical zone should be repaired.

A Magnetic Flux Leakage (MFL) scan was performed on approximately 92 percent of the tank bottom at a remaining wall threshold of 0.135 inches thick in the bottom plates and 0.155 inches thick in the critical zone (within three inches of the shell) for a 5-year inspection interval. There was corrosion below the thresholds on Bottom Plates 1, 2, 3, 4, 6, 7, 8, 10, 11, 12, 13, 14, and 15. The lowest indication found was 0.070 inches located on Bottom Plate 13. If the tank bottom is not replaced, soilside corrosion areas with 0.135 inches or less of remaining wall thickness outside the critical zone should be repaired. Soilside corrosion areas with 0.155 inches or less of remaining wall thickness inside the critical zone should be repaired.

Ultrasonic Edge Scrubs (UES) were performed on the tank bottom at the 8 survey locations. The thicknesses ranged from 0.100 to 0.270 inches. Corrosion at or below the threshold was found at Radials 2, 6, 7 and 8.

Corrosion areas were found in the critical zone that exceeded 24 inches in length. The bottom plates in these areas should be replaced or a finite element analysis should be performed to better determine the stresses from using oversized repair plates and their acceptability.




An ultrasonic thickness reading was taken at random on each bottom plate. The thickness readings ranged from 0.248 to 0.470 inches.

The flat-bottom sump was 48 inches in diameter and 24 inches deep. The bottom thicknesses ranged from 0.200 to 0.350 inches. The side wall thicknesses ranged from 0.250 to 0.380 inches. There was a band of corrosion with pitting up to 0.110 inches deep located in the side wall 8 inches above the sump bottom.

External Shell

The fill height analysis found that this tank was adequate for continued service. No corrective action is required.

There were minor buckles in the shell. The buckles and their locations should be noted in the tank record.

Internal Shell

There was light, widespread corrosion on the internal shell. The internal shell had isolated areas of corrosion ranging from approximately 0.010 to 0.050 inches deep near the cornerweld. No repair is required.

Inspection of the internal cornerweld was limited due to product residue and dirt. There was corrosion in the visible areas of the cornerweld. Consideration should be given to cleaning and re-inspecting the cornerweld. The areas of corrosion should be weld repaired.

Shell Items B and J did not appear to penetrate the internal shell.

The internal shell had isolated areas of corrosion ranging from approximately 0.010 to 0.050 inches deep near the cornerweld. No repair is required.

The gauge pole supports lacked pad plates on the internal shell. Consideration should be given to installing pad plates on the internal shell under the gauge pole supports.




Access Structures

There was coating failure on the ladder and roof handrail. The areas of coating failure with corrosion should be cleaned and painted.




Appendix Standard Field Report

Calculations

Survey

Bottom Corrosion Evaluation

Fill Height Shell Corrosion Rate Evaluation Equipment Calibration

TCI Equipment and Calibration Log Photographs

1.0 TRUECustomer Tank No

City, ST Inspected

Scope Job No

Tank / Nameplate Information Latitude Longitude

34.00 HGT [FT] 24.17 LEN [FT]106.81 FILL HGT 24.17 BARRELS1979 MFG

Other

Edition Appendices

Other

Other

Other

Other Double Bottom Leak Detection

Other

Other Insulated Cut Down and Re-Erected Lap Welded Double Wall

Access/LadderOther

GRAVITY 1.00 API 10.0 Product Heated Level [FT]

Other

Other Primary Seal Internal Vertical Ladder Secondary Seal External Rolling Ladder

External PaintPrevious Inspection History / External Coating DateInternal Inspection

Max Temp [F]Fixed Roof Type Cone Open Dome Geodesic Dome Other

Floating Roof Type None Open Floating Roof Internal Floating Roof

Shell Construction Welded Riveted Other

Spiral Radial Vertical Ladder Catwalk Other

Product Storage Unknown

Bottom Slope Cone Up Cone Down Flat Drain Dry Wedge Unknown Bottom Coating None Thin Film Epoxy Thick Fiberglass Unknown Other

Date Installed

Bottom Construction Welded Riveted Other Date Installed

Cathodic Protection Date Installed

Head Type Flat Dished Hemi Elliptical Other None

Foundation Grade Material Grade Crushed Stone Sand/Soil Concrete Ringwall Ringwall Concrete Pad Steel Saddles Concrete Saddles Saddles Skids Platform/Legs Unknown Other

Other Nameplate Information

Tank Type / DescriptionTank Type Vertical Horizontal Rectangle Tote Other

PWHT - Post Weld Heat TreatConstruction

Standard API-650 API-620 API-12C API-12F UL STI ASME SWRI Unknown

API 6th

Year Built UnknownShell Material A283-C

DIAMETER [FT] BARRELS/GALLONSCircumference [FT] Capacity 3,571

INTERNAL, MFL TC9338

Inspection InformationInspectors S. Saxbury (API-653 #50761), A. Majors and S. Barrows

Scope of Work INTERNAL, MFL

Tank Consultants, Inc. 4333 West 21st Tulsa, OK 74107 (918) 583-3968 tank-consultants.com

Grand River Dam Authority GRDA 2Chouteau, OK 09.23.2015

TCI

Location

This document is intended for the sole use of Tank Consultants, Inc. and its customers.Any unauthorized reproduction is prohibited. © 2015 Page 1 of 20Rev-1.16 - 08.11.15

Customer Tank NoCity, ST InspectedScope Job No

1 OK NOT OK

Other

MIN [IN] MAX [IN]

4 63 7

Saddles [FT]

Number / Quantity Distance Between Saddles Saddle Width [IN] Distance From End

Number / Quantity OKBolt Diameter [IN] Corroded threadsSpacing [FT]

1 OK NOT OK Obvious Settlement Grade sloped toward tank Discontinuous Ringwall Grade against tank Broken Concrete Standing water against tank Exposed Rebar Void areas under tank Washed Out Areas

Saddle Failure Condition(s) No Pad Plates Pad Plates Not Seal Welded Saddle Corrosion

1 OK NOT OK1 Excessive Vegetation Deterioration of dike wall

Buildup of Debris Deterioration of tank berm

Anchors

Loose nuts

Foundation Failure Condition(s)

Housekeeping Around the Tank

Foundation Comments

Comment(s)

Ringwall DimensionsDistance From Shell to Edge of RingwallDistance From Top of Ringwall to Grade


Foundation

Foundation Type / Details Grade Material Grade Crushed Stone Sand/Soil Concrete Ringwall Ringwall Concrete Pad Steel Saddles Concrete Saddles Saddles Skids Platform/Legs Unknown Other


Grand River Dam Authority 2Chouteau, OK 09.23.2015

TCI

Location



1 OK NOT OK

Peeling Cracking Areas Not Coated Thin 1 Stained

OK NOT OKNone Corrugated Banded

Sprayed Foam

Torn Holes Areas Not InsulatedDescribe Coating / Insulation Problems Found

External Shell Corrosion 1 OK NOT OK Active Corrosion Shell Corrosion Old Corrosion Bottom Extension Corrosion Corrosion Damage

Describe Corrosion Problems Found

External Shell Welds Condition(s) 1 OK NOT OK Pinholes or Porosity Lack of fusion Cracks Slag Corrosion Weld Plug Tested Arc Strikes

Describe Weld Problems Found

Shell Distortion and Buckling 1 OK NOT OK Major Buckles Distortion Around Piping

1 Minor BucklesDescribe Shell Distortion and Buckling Problems Found

Shell Improper Construction Practices 1 OK NOT OK Square Corner insert plates Telltale Holes Plugged Weld Spacings not to API STD's No Telltale Holes Lap Welded Patches Other Un-Reinforced Penetrations

Describe Shell Improper Construction Practices Problems Found

Comments

Comments

Comments

Comments

Shell InsulationType

Condition(s) Like New Good Fair Poor None

Comments


External Shell

External Shell CoatingCondition(s) Like New Good Fair Poor None



TCI

Location


Customer Tank NoCity, ST InspectedScope Job NoINTERNAL, MFL TC9338

External Shell



TCI

Location

Ground Cables OK NOT OK Broken Cable 1 None Found Broken Shell Attachment

OK NOT OKNone

Tape Does Not Have Free Movement Floats, Guides or Attachments Not in Working Order

Product Leaks 0 OK NOT OK

Additional Shell Problems Found

1 OK NOT OK Corrosion Detached Buckling Broken Welds No Top Angle

Quantity SizeRecord Qty and Size of All Shell Vents

Shell Vents Distance From Roof

Comments

Thickness 0.250Distance From Roof 0

Vertical Leg 2.5Horizontal Leg 2.5

Comments

Top Angle, Wind Girder and Shell Vents

Coating Failure

Dimensions [IN] Top Angle Wind Girder

Level GaugeEquipment Manufacturer Type/Model

CommentsCoupling G had dry product staining.

There was a wet product stain on the bottom extension on the southeast side of the tank.


Customer Tank No 2City, ST Location Inspected 09.23.2015Scope Job No TC9338

REPADSHAPES

[FT] [IN] [IN] NOZZLELABEL DESCRIPTION LOCATION HEIGHT SIZE TT1 SHAPE WID HGT THK NECK SPACE WELD TO3

A Manway 0.00 30.00 24.00 1 62.00 50.00 0.258 0.499 4.25 CWB Plug 20.45 18.00 4.00 15.00 CWC Nozzle 26.44 12.00 4.00 1 16.00 12.00 0.242 0.342 5.00 CWD Nozzle (R3) 38.90 6.00 1E Nozzle 39.80 30.00 6.00 1 20.00 16.00 0.241 0.441 21.50 CWF Nozzle (R3) 40.80 3.00 1G Coupling 45.60 18.00 1.25 16.50 CWH Vertical Ladder 53.25I Nozzle (R3, Blinded) 80.00 6.00 1J Plug 84.28 18.00 4.00 15.50 CW

Shell Nozzles andAppurtenances

1: TT (Tell Tale Hole): 0 = NO, 1 = YES(Un-plugged), P=YES(Plugged) 3: WELD TO: CW=Cornerweld, AR=Repad of Item A, A=Weld of Item A, HW=Horizontal Weld, VW=Vertical Weld, TS=Tombstone Type Repad

REPAD [IN] WELD SPACING [IN]


Grand River Dam AuthorityChouteau, OKINTERNAL, MFL

TCI

RND RECREC HEX TMB


Customer 2City, ST 09.23.2015

Location TC9338Scope

Shell Vertical Seams

Vertical Seam Locations - For Ring 11 5.78 15 292 32.50 16 303 59.22 17 314 85.94 18 325 19 336 20 347 21 358 22 369 23 37

10 24 3811 25 3912 26 4013 27 4114 28 42

Shell Ring Heights, Thickness Readings and Construction

Total 24.01 0.03125 Joint NbrRing Height [FT] Nominal Bottom Middle Top Type Rivets Rivet Seal Type

1A 7.96 0.281 0.265 0.263 0.260

1B 0.249 0.252 0.251

1C 0.262 0.262 0.263

1D 0.254 0.257 0.254

2 7.92 0.219 0.202 0.200 0.195

3 7.92 0.219 0.198 0.200 0.202

Job No

INTERNAL, MFL

For Ring 1: Shell plates measured at the four quadrants. Courses measured at 12" above the bottom, the middle of the course and 12" below the top of the course. For Upper Rings: Thickness of each ring measured at 3 points minimum per ring. Joint Type - butt welded, lap welded, butt riveted, lap riveted. Rivet Seal Type - Unsealed Rivets, Seal Welded Rivets, Expoxy Sealed Rivets.

Thickness [IN] Readings @


Grand River Dam Authority Tank No

Chouteau, OK Inspected

TCI


Customer Tank No

City, ST Inspected

Scope Job No

Record the General Nozzle Orientation on Diagram Below.Inspect and Record Shell Nozzle Details on the Shell Nozzles and Appurtenances PageStarting Location Direction

Nozzle Layout

Comments


West Manway A CCW

Nozzle Layout \\nasserver\clients\GRDA\TC9338\Tank 2 GRDA TC9338 Nozzle Layout.wmf



TCI

Location

DRAWING NOT TO SCALE



Access - Stairs, Platforms and Handrails 1 OK NOT OK Broken Welds Cable Members Bent Members Corrosion

1 Coating Failure Chain MembersStairway

Radial Spiral Catwalk 1 Ladder

OtherStructure

Platform Walkway1 Roof Handrail

OtherOSHAREQ

MIN 24"

MIN 24"

MIN 4"

MIN 42"

MAX 96"2

Note1

YES NO YES NO YES NO

REQ'D

REQ'D

OSHA REQ OSHA REQMIN 22" MIN 16"

- MAX 30'

30 - 50 10" - 14"

30" - 36" MIN 7"

NOTE1 MIN 3/4"MAX 96"2 27" - 30"

YES NO MAX 9.5" MAX 8' 1.5" - 12"

Comments

Slip-Resistant (REQ'D) Rung-to-Roof [IN] 8.00NOTES: 1 - 2x2x3/8" or 1.5" pipe minimum 2 - The spacing of uprights may meet the intentions of the OSHA midrail requirement.

Stairways, Platforms, and Handrails - Describe Problems Found

STAIRWAY Properties Cage Verticals [IN] 8.00Midrail (REQ'D) Cage Hoops [FT] 3.92

Upright Member Size Rung Size [IN] 3/4Upright Spacing [IN] Rung-To-Cage [IN] 27.00

Angle [Degrees] Rung-to-Rung [IN] 12.00Handrail Height [IN] Rung-To-Shell [IN] 7.75

Width [IN] Width [IN] 16.75Rise [IN] / Run [IN] Height [FT] 24.00

STAIRWAYDIMENSIONS EXISTING DIMENSIONS EXISTING

Midrail PresentSlip-Resistant Surface

NOTES: 1 - The spacing of uprights may meet the intentions of the OSHA midrail requirement. 2 - 2x2x3/8" or 1.5" pipe minimum

Spacing of Uprights [IN] 81.50Size of Upright Member 2.5"x2.5"x1/4"

Toe Board Height [IN] 4.00Handrail Height [IN] 42.00

Width [IN]Length [IN] 1265.00


DIMENSIONS EXISTINGHANDRAIL



TCI

Location



Adverse Condition(s) 1 OK NOT OK Holes Excessive Waviness Areas That Hold Water Corrosion Damage Active Corrosion

Coating Condition(s) 1 OK NOT OK

Peeling Stained Cracking Insulated Thin

Open VentsPressure/Vacuum

Missing/Damaged Parts Flame Arrestor Screens Missing/Damaged Corrosion Damage Painted Closed Service Vents

Rise [IN] Run [IN]

Additional Comments

One 3-inch gooseneck center ventOne 24-inch emergency vent, one 6-inch pressure vent

Roof Slope (As Measured with a 2' - 4' Level)

Problem Detail(s)


External Fixed Roof

Condition Like New Good Fair Poor None

Venting Type(s), Quantity, Setting(s) and Condition(s)



TCI

Location



External Fixed Roof



TCI

Location

Fixed Roof Layout \\nasserver\clients\GRDA\TC9338\Tank 2 GRDA TC9338 Roof Layout.wmf

Fixed Roof Layout

BC

D

E


A


Customer Tank No 2City, ST Inspected 09.23.2015

Location Job No TC9338Scope

Items Not Coated Missing Nuts or Bolts

Label Description Size Radius [FT] CommentA Open Vent 3" 0 gooseneck ventB High Level Alarm 4" 15C Nozzle 4" 15D Manway 24" 15 emergency ventE Gauge Hatch 6" 15

Note: Positive radius values are distances from center. Negative radius values are distances from shell


Grand River Dam AuthorityChouteau, OK

INTERNAL, MFL

External Fixed Roof Fittings

TCI



Radius [FT] [IN] Minimum 0.204Quadrant Location Thickness Maximum 0.209

N C 0.205N 0.208N 0.204S 0.209S 0.205E 0.205E 0.209W 0.207W 0.205


External Roof Thickness Readings



TCI

Location



1 OK NOT OK

Cornerweld Condition(s) 0 OK NOT OK Pinholes 1 Corrosion Slag Porosity Cracks 1 Product Residue Arc strikes Coated Not Inspected (Explain)

Record the Location, Depth and Extent of Any Deep Corrosion Area(s)

Shell Weld Condition(s) 1 OK NOT OK Arc strikes Porosity Slag Pinholes Coated Not Inspected (Explain) Corrosion Cracks

Record the Location, Depth and Extent of Any Deep Corrosion Area(s)

Appurtenance Welds & Internal Piping 1 OK NOT OKInternal Appurtenance / Nozzle Welds

Incomplete Shell Welds Not Visible Due to Coating/Residue Not Welded to Shell Pinholes or Porosity Corrosion Cracks in Weld

Internal Piping Welds Support Bases Not Seal Welded Hole in Internal Piping Inadequate Pipe Supports No Pad Plates on Pipe Supports Supports Weld to Pipe and Bottom

Improper Construction Practices 1 OK NOT OK Attachments Not Fully Welded Lap Welded Patches False Bottoms (Shell Not Slotted) Shell Burrs

Problem Details

Shell Items B and J did not appear to project through the shell.

The gauge pole supports lacked pad plates on the internal shell.

The internal shell had isolated areas of corrosion ranging from approximately 0.010 to 0.050 inches deep near the cornerweld.

Widespread Localized

CommentsInspection of the internal cornerweld was limited due to product residue and dirt. There was corrosion in the visible areas of the cornerweld.

Comments


Internal Shell

Corrosion on the Internal Shell None Light Medium Heavy



TCI

Location



Internal Fixed Roof

Roof Support Type / Condition 1 OK NOT OK

ROW QTY RADIUS [FT] ROW QTY RADIUS [FT] ROW QTY RADIUS [FT]

CENTER 0.00 3 61 4 72 5 8

OK NOT OK

OtherA B

OtherA B

Welded Corroded Out of Plumb Bolted Twisted Broken Weld Riveted Damaged No Drain Hole Bowed

OK NOT OK

FlatPlate

T-Type

OtherA B

OtherA B

Welded to Bottom Welded Bearing Plate Not Seal Welded Damaged Riveted No Guide Clips Bolted Broken Weld Corroded No Bearing Plate

Condition(s)

Outer Base(s) None H-Type Flat Plate T-Type Other

Bearing Plate Size and Thickness

Roof Column Base(s) - Type(s) and Size(s)

H-Type

Center Base None H-Type Flat Plate T-Type Other

Bearing Plate Size and Thickness

Outer Column(s) None Combination Structure Pipe Columns Other

Condition(s)

Roof Columns - Quantity and Radial Location

Roof Columns - Type(s) and Size(s)

PIPE COLUMNCOMBINATION

STRUCTURE

Center Column None Combination Structure Pipe Columns Other


Support Type Structural Supported Self Supported Other Other



TCI

AB

AB

BAA

Location



Internal Fixed Roof




TCI

Location

1 OK NOT OK Twisted Sagging Damaged Bowed Corroded Rafters Not Radial

Hole(s) in the Roof Indicated by Daylight 1 OK NOT OK Hole Corrosion Un-Capped Opening

Rafter Condition(s)

Detail(s) of Problems Found


13' 0.13'' DIFF [IN] AVG [IN] MIN [IN] MAX [IN]

RADIALS 0.48 0.100 0.270-17.0' 10 -5 -4 -3 -2 -1 0' RIM

RADIAL CENTER PT01 PT02 PT03 PT04 PT05 PT06 PT07 PT08 PT09 PT10 PT11 SHELL SPACE MIN [IN] MAX [IN]1 3.88 3.97 4.18 4.16 4.15 4.12 4.10 4.11 0.180 0.2702 3.88 4.11 4.12 4.13 4.12 4.10 4.10 4.10 0.100 0.2603 3.88 4.08 4.26 4.23 4.20 4.15 4.11 4.09 0.250 0.2604 3.88 4.02 4.17 4.19 4.22 4.16 4.12 4.09 0.250 0.2605 3.88 3.97 4.10 4.12 4.13 4.08 4.07 4.08 0.160 0.2706 3.88 4.05 4.16 4.15 4.16 4.17 4.15 4.10 0.110 0.2707 3.88 4.03 4.16 4.16 4.15 4.13 4.11 4.11 0.100 0.2608 3.88 3.99 4.19 4.20 4.21 4.18 4.15 4.12 0.150 0.260

Distance [FT] From Shell - Every Foot for First Five Feet and a Maximum of 20' or Half the Radius Thereafter. Record the Distances Below.UT Edge Scrubs

Internal Bottom Survey Inverted Rod Readings [FT], Floating Roof Rim Spaces [IN] and Bottom UT Edge Scrubs [IN]STARTS @ West Manway A DIR (CCW/CW) CCW CHORD SPACING [FT-IN]

City, ST Chouteau, OK Inspected 09.23.2015Scope INTERNAL, MFL Job No TC9338


Customer Grand River Dam Authority Tank No 2

TCI

Location



Bottom Condition(s) 1 OK NOT OK Welded 1 Water Washed Riveted Brush Blasted Double Bottom Standing Water Product Residue

Internal Corrosion Inspection 0 OK NOT OK1 Weld Seam Corrosion Hole(s)1 Areas of Pitting Plates Not Seal Welded1 Isolated Pitting 1 Critical Zone Corrosion

OK NOT OK

1 None Holidays Thick Coating Peeling Thin Coating Blisters Cracks Needs repair Areas Removed for UT Should be Replaced

Bottom Coating(s)Thickness [mils]


Bottom Inspection

Bottom Nominal Thickness - Sketch/Annular Plates Inner Plates

Comments

An extremely limited visual inspection of the tank bottom was performed to locate topside pits 0.070 inches deep and deeper in the bottom plates and 0.055 inches deep and deeper in the critical zone (within three inches of the shell) for a 5-year inspection interval. Areas of corrosion below the thresholds were found in Bottom Plates 9 and 10. The visual inspection could not be completed due to an excessive amount of dirt and product residue.

The internal cornerweld had several areas of corrosion.



TCI

Location



Bottom Inspection



TCI

Location

0 OK NOT OKDate By

1 09.23.15 TCI

0 OK NOT OK Humps

1 Edge Settlement Greater Than 3/8" Per Foot

Extent of Voids Under Bottom OK NOT OK

Sump Condition(s) 0 OK NOT OK Coated Debris Holes Contains Water or Product Corrosion Not Inspected

Other Conditions or Problems Found

Comments The edge settlement at Radials 1, 3, 4, 6, 7 and 8 exceeded 3/8 inches per foot.

Comments

Comments

The flat-bottom sump was 48 inches in diameter and 24 inches deep. The bottom thicknesses ranged from 0.200 to 0.350 inches. The side wall thicknesses ranged from 0.250 to 0.380 inches. There was a band of corrosion with pitting up to 0.110 inches deep located in the side wall 8 inches above the sump bottom.

Helium Test

Comments

A Magnetic Flux Leakage (MFL) scan was performed on approximately 92 percent of the tank bottom at a remaining wall threshold of 0.135 inches thick in the bottom plates and 0.155 inches thick in the critical zone (within three inches of the shell) for a 5 year inspection interval. There was corrosion below the thresholds on Bottom Plates 1, 2, 3, 4, 6, 7, 8, 10, 11, 12, 13, 14, and 15. The lowest indication found was 0.070 inches located on Bottom Plate 13.

Corrosion areas were found in the critical zone that exceeded 24 inches in length.

Ultrasonic Edge Scrubs (UES) were performed on the tank bottom at the 8 survey locations. The thicknesses ranged from 0.100 to 0.270 inches. Corrosion at or below the threshold was found at Radials 2, 6, 7 and 8.

Bottom Humps, Sags or SettlementSags

MFL Scan approximately 92 percent of the tank bottomMag ParticleHoliday Test

Vacuum BoxLap WeldsCornerweld

Bottom TestingTesting Performed Areas Inspected



Bottom Inspection



TCI

Location

Bottom Layout

Bottom Layout \\nasserver\clients\GRDA\TC9338\Tank 2 GRDA TC9338 Bottom Layout.wmf


- Soilside Corrosion Area- Topside Corrosion Area

0.160"-0.270"Radial 5

Vertical W

eld 4

Vertical W

eld 3

Rad

ial 6

Ver

tical

Wel

d 5

0.150"-0.260"

0.250"-0.260"

Vertical W

eld 1

Vertical W

eld 2

Radial 4

Radial 3

Radial 7

0.188"-0.270"Radial 1

0.250"-0.260"

Radial 8

0.11

0"-0

.270

"

Rad

ial 2

0.100"-0.260"

0.10

0"-0

.260

"

Manway A

1012

56

1 2

4

3

9

13 14 15

7 8

11

-12" x 12" Soilside Corrosion



Customer Tank No 2City, ST Inspected 09.23.2015

Location Job No TC9338Scope

Bottom Thickness [IN] Readings Min 0.247 Max 0.260PlateNo THK1 THK2 THK3 THK4 THK5 Comment

1 0.2502 0.2513 0.2494 0.2585 0.2476 0.2507 0.2608 0.2579 0.250

10 0.24811 0.25412 0.25113 0.25614 0.250


INTERNAL, MFL

TCI


Foundation Type Concrete Ringwall Diameter [FT] 34.00Bottom Construction Lap Welded Height [FT] 24.17

Fixed Roof Type DomeBottom Shape Cone Up Year Built 1979

Bottom Coating None Construction Code API-650

Product UnknownSpecific Gravity 1.00

Tank Consultants, Inc.4333 West 21stTulsa, OK 74107

(918) 583-3968 Fax (918) 583-3966www.tank-consultants.com

Job Number - TC9338

API-653 Tank Settlement Evaluation


Survey Date - 09.23.2015Tank No - 2

TankPicture/Sketch

Prepared By

T.Wach P.E. (API-653 #50849)

Surveyed By

S. Saxbury (API-653 #50761), A. Majors and S. Barrows

Report Date - 09.23.2015

TCI

Tank - 2 Settlement Evaluation Report Job Number - TC9338

Grand River Dam Authority Report Date - 09.23.2015

Location - Chouteau, OK API-653 Tank Settlement Evaluation

Table of Contents Page

Settlement Evaluation.............................................................................................................. 3

Settlement Summary Data / Calculations.............................................................................. 4

Settlement Charts.................................................................................................................... 6

Field Data.................................................................................................................................. 9

This document is intended for the sole use of Tank Consultants, Inc. and its customers.Any unauthorized reproduction of this document is prohibited. © 2014

Tank - 2 Settlement Evaluation Report Job Number - TC9338

Grand River Dam Authority Report Date - 09.23.2015

Location - Chouteau, OK API-653 Tank Settlement Evaluation

Settlement Evaluation Summary

Grand River Dam Authority contracted with Tank Consultants, Inc. to provide an internal settlement survey for Tank 2 located in Chouteau, OK. The settlement evaluation was per API-653, 5th Edition, November 2014 Appendix B. According to records provided by the customer, the tank was built in 1979 per API-650 construction standard. The tank has a concrete ringwall foundation.

The elevation survey consisted of 8 survey points equidistant around the tank shell perimeter. Survey Point 1 was located at or near the Manway A and the survey proceeded counter-clockwise around the tank shell perimeter.

The settlement data was fitted to an optimum cosine curve using the least squares method and plotted in graph form. The settlement data shows the tank to be 0.48 inches out of level with the low point located at or near Survey Point 8 or 93.46 feet counter-clockwise from Survey

Point 1. The measure of statistical validity (R2) was 0.90 per B.2.2.4.e.

The out-of-plane, or differential settlement, was calculated for each actual survey point's elevation and plotted in graph form. The largest out-of-plane settlement was 0.14 inches. A maximum permissible out-of-plane settlement of 0.50 inches was calculated per Appendix B.3.2.1. None of the survey points exceed this value.

The tank bottom near the shell was inspected for bulges, ridges, sags and edge settlement that might indicate areas of excessive stress. Because the tank shell does not sit on a grade foundation, settlement near the shell was evaluated per API-653, Appendix B, Sections B.3.3 and the associated footnote. One or more radials exceeded the B/R threshold of 0.37 inches/feet. Further engineering analysis was required. The most severe edge settlement was 3.48 inches located at 5 feet from the shell at radial 3. Radial(s) 1, 2, 5, 6, 7, 8 are OK and require no further corrective action. For Radial(s) 3, 4 the cornerweld and all bottom lap welds in the affected area(s) should be examined by magnetic particle testing. Alternatively, a rigorous stress analysis (FEA) could be performed to better determine the stresses and their acceptability without repair or further NDE Examination.

This document is intended for the sole use of Tank Consultants, Inc. and its customers.Any unauthorized reproduction of this document is prohibited. © 2014 Page 3 of 10

Tank Consultants, Inc. · 4333 West 21st · Tulsa OK 74137 · 918 583-3968 · tank-consultants.comAPI 653 Appendix B Settlement Summary Data /CalculationsGrand River Dam Authority - Chouteau, OK - Tank 2 Job No - TC9338

TCI

Date 09.23.15 09.23.15 09.23.15 09.23.15 09.23.15 09.23.15Radial Distance Settlement Cosine B.2.2.5 Si Smax Elevation Elevation Elevation Elevation Elevation Elevation Elevation Elevation

4 40.06 0.12 0.04 0.00 0.12 0.50 0.02 #REF! #REF! #REF! #REF! #REF! #REF! #REF!5 53.41 0.00 0.09 0.00 0.14 0.50 0.03 #REF! #REF! #REF! #REF! #REF! #REF! #REF!6 66.76 0.24 0.22 0.00 0.07 0.50 0.01 #REF! #REF! #REF! #REF! #REF! #REF! #REF!7 80.11 0.36 0.36 0.00 0.04 0.50 0.00 #REF! #REF! #REF! #REF! #REF! #REF! #REF!8 93.46 0.48 0.44 0.00 0.06 0.50 -0.01 #REF! #REF! #REF! #REF! #REF! #REF! #REF!1 0.00 0.36 0.39 0.00 0.04 0.50 0.00 #REF! #REF! #REF! #REF! #REF! #REF! #REF!2 13.35 0.24 0.26 0.00 0.01 0.50 0.01 #REF! #REF! #REF! #REF! #REF! #REF! #REF!3 26.70 0.12 0.12 0.00 0.02 0.50 0.02 #REF! #REF! #REF! #REF! #REF! #REF! #REF!4 40.06 0.12 0.04 0.00 0.12 0.50 0.02 #REF! #REF! #REF! #REF! #REF! #REF! #REF!


Tank Consultants, Inc. · 4333 West 21st · Tulsa OK 74137 · 918 583-3968 · tank-consultants.comAPI 653 Appendix B Settlement Summary Data /CalculationsGrand River Dam Authority - Chouteau, OK - Tank 2 Job No - TC9338

TCI

[IN] [FT] [IN/FT] Safety [IN] [IN]Radial B R B/R Factor Bew Be Max Actual

1 2.28 5 0.455 3.43 2.81 3.42 39 OK - None Required2 1.68 5 0.336 6.32 2.81 3.42 OK - None Required3 3.48 5 0.695 1.47 2.81 3.42 Magnetic Particle/FEA4 2.42 3 0.807 1.60 2.08 2.43 1 Magnetic Particle/FEA5 1.68 5 0.335 6.32 2.81 3.42 OK - None Required6 2.16 5 0.432 3.82 2.81 3.42 63 OK - None Required7 2.04 5 0.407 4.28 2.81 3.42 OK - None Required8 2.28 5 0.456 3.43 2.81 3.42 39 OK - None Required9

101112131415161718192021222324252627282930313233343536

Alpha [Degrees]Action


Tank - 2 Settlement Evaluation Report Report ID - TC9338Grand River Dam Authority Report Date - 09.23.2015Location - Chouteau, OK API-653 Tank Settlement Evaluation

0.48"

0.00

0.10

0.20

0.30

0.40

0.50

0.60

40 53 67 80 93 0 13 27 40

Se

ttle

me

nt[

IN]

Circumferential Distance [FT]

Planar SettlementSettlement - 09.23.15

Cosine - 09.23.15

This document is intended for Tank Consultants, Inc. and its customers.Any unauthorized reproduction of this document is prohibited. © 2014 Page 6 of 10


0.14"

0.50"

0.00

0.10

0.20

0.30

0.40

0.50

0.60

40 53 67 80 93 0 13 27 40

Se

ttle

me

nt

[IN

]

Circumferential Distance [FT]

Out-of-Plane or Differential Settlement Si - 09.23.15

Smax - 09.23.15



-4.50

-4.40

-4.30

-4.20

-4.10

-4.00

-3.90

-3.80-18 -16 -14 -12 -10 -8 -6 -4 -2 0

Edge Settlement [FT] From Shell [FT]

Radial 3 Actual Radial 3 Projected


Tank Consultants, Inc. · 4333 West 21st · Tulsa OK 74137 · 918 583-3968 · www.tank-consultants.comAPI 653 Tank Bottom Settlement Data

Customer Tank NoLocation Date Surveyed 09.23.15

Surveyed By S. Saxbury (API-653 #50761), A. Maj TC9338

Tank Diameter 34 [FT] Radial 1 Survey Starts @ Manway ATank Height 24.167 [FT] Survey Direction [CW/CCW]

Actual Product Level 0 [FT] Number of Radials 8Foundation Type Concrete Ringwall Actual Radial Spacing [FT] 13.35Fixed Roof Type Dome Inverted Elevations TRUE

Radial Distance Ring 1 Hgt SettlementNumber [FT] #1 #2 #3 #4 [IN] Change Absolute [IN]

Grand River Dam Authority 2Chouteau, OK

Job Number

Counter-Clockwise

Set Up - Rod Readings/Elev's [FT] @ Bottom @ Shell Elevation [FT]

TCI

1 0.00 4.11 0.00 0.00 0.362 13.35 4.10 0.01 0.01 0.243 26.70 4.09 0.02 0.02 0.124 40.06 4.09 0.02 0.02 0.125 53.41 4.08 0.03 0.03 0.006 66.76 4.10 0.01 0.01 0.247 80.11 4.11 0.00 0.00 0.368 93.46 4.12 -0.01 -0.01 0.489 0.00

101112131415161718192021222324252627282930313233343536

#1 #2 #3 #4 Adjust BM

BM 0.00

Calculations - Minimum Elevation @ Radial, Elevation, Total Settlement 8 -0.01 0.48

Benchmark LocationDescription

Benchmark Rod Reading [FT] @ Set Up # Elevation [FT]


Tank Consultants, Inc. · 4333 West 21st · Tulsa OK 74137 · 918 583-3968 · www.tank-consultants.com API 653 Tank Bottom Settlement Evaluation Data

Customer Grand River Dam Authority Tank NoLocation Chouteau, OK Job Number

Surveyed By S. Saxbury (API-653 #50761), A. Majors and S. Barrows Date Surveyed

Tank Diameter 34 Survey Starts @Tank Height 24.167 Survey Direction

Foundation Type Concrete Ringwall Number of RadialsFixed Roof Type Dome Calculated/Actual Chord Spacing [FT] 13.01

Inverted Elevations

Radial Center Ring 1NBR -17 -10 -5 -4 -3 -2 -1 0 Height [IN]

1 3.88 3.97 4.18 4.16 4.15 4.12 4.10 4.112 3.88 4.11 4.12 4.13 4.12 4.10 4.10 4.103 3.88 4.08 4.26 4.23 4.20 4.15 4.11 4.094 3.88 4.02 4.17 4.19 4.22 4.16 4.12 4.095 3.88 3.97 4.10 4.12 4.13 4.08 4.07 4.086 3.88 4.05 4.16 4.15 4.16 4.17 4.15 4.107 3.88 4.03 4.16 4.16 4.15 4.13 4.11 4.118 3.88 3.99 4.19 4.20 4.21 4.18 4.15 4.129

10111213141516171819202122232425262728

2TC9338

09.23.15

Rod Readings / Elevations [FT] @ Distance [FT] From Center / Shell… + Values (From Center), - Values (From Shell)

Manway ACounter-Clockwise

8

TRUE

TCI

This document is intended for the sole use of Tank Consultants, Inc. and its customers. Any unauthorized reproduction of this document is prohibited. © 2015 Page 10 of 10

BOTTOM CORROSION ANALYSISTO DETERMINE REPAIR THRESHOLDS Tel 918-583-3968 Fax 918-583-3966

AND INSPECTION INTERVALS 4333 West 21st Street

PER API-653 3rd and 4th EDITION Tulsa, OK 74107-3444

SECTION 4.4.5 www.tank-consultants.com

where: Units:

Age = Age of Bottom Plates YearsTo = Original Bottom Thickness Inches

MRT = Minimum Allowable Bottom Thickness Inches0.1" (No Coating or Thin Coating)0.05" (Thick Coating or Leak Detection & Containment)

RTip = Remaining Thickness From Topside Pitting After Repairs InchesRTbc = Remaining Thickness From Soilside Corrosion After Repairs InchesStPr = Maximum Topside Corrosion Rate Inches/YrUPr = Maximum Soilside Corrosion Rate Inches/Yr

Or = Inspection Interval Years

NOTE:

StPr = 0 if the tank bottom is internally lined (see API RP 652)

UPr = 0 if tank bottom is Cathodically Protected (CP) (see API RP 651)

TopsideCorrosion

Soilside Corrosion

Evaluate for bare steel, thin coating, thick or reinforced coating, and leak detection & containment (LD&C)Evaluate for the inner plates, sketch plates and the critical zone (within 3 inches of the shell).

TCI Tank Consultants, Inc.

( )rr

ipbcr UPStP

MRTRTRTO

+−

=,min

Age

RTTStP

ipo

r

−=

Age

RTTUP bco

r

−=

Page 1 of 3 10/14/2015 1:03 PM

Tank 2 GRDA TC9338 Bottom Corrosion

Bottom Corrosion AnalysisTO DETERMINE REPAIR THRESHOLDS Job Number:

AND INSPECTION INTERVALS Customer Name:PER API-653 3rd and 4th EDITION Location:

SECTION 4.4.5 Tank Number:

MEASURED DATA: INPUT:

Enter year of inspection 2015

Enter year bottom constructed 1979

Enter assumed original inner plate thickness (To) 0.250 inches

Enter assumed original sketch plate thickne (ToSP) 0.250 inches

Enter desired inspection interval (Or) 20 years, maximum 20 years

Inner Plate Topside Corrosion…

enter recordable pit depth 0.070 inches

enter maximum pit depth 0.070 inches

Inner Plate Soilside Corrosion…

enter MFL scan threshold 0.180 inches

enter minimum thickness 0.070 inches

Sketch Plate Topside Corrosion…

N/A (since same as Inner Plates)


Sketch Plate Soilside Corrosion…



Critical Zone Topside Corrosion… No Is the Critical Zone to be replaced?

enter recordable pit depth 0.055 inches

enter maximum pit depth 0.055 inches

Critical Zone Soilside Corrosion…

enter MFL scan threshold 0.195 inches

enter minimum thickness 0.100 inches

REPAIR THRESHOLDS AND PATCH PLATE THICKNESSES:

Inner Plate Topside Pit Depth Repair Threshold 0.070 inches, cannot be less than recordable pit depth

Inner Plate Soilside Corrosion Repair Threshold (RTbc) 0.180 inches, cannot exceed MFL scan threshold

Inner Plate Soilside Corrosion Patch Plate Thickness 0.250 inches, usually 0.250"

Sketch Plate Topside Pit Depth Repair Threshold

Sketch Plate Soilside Corrosion Repair Threshold (RTbcSP)

Sketch Plate Soilside Corrosion Patch Plate Thickness

Critical Zone Topside Pit Depth Repair Threshold 0.055 inches, cannot be less than critical zone recordable pit depth

Critical Zone Soilside Corrosion Repair Threshold (RTbcCZ) 0.195 inches, cannot exceed critical zone MFL scan threshold

Critical Zone Soilside Corrosion Patch Plate Thickness 0.250 inches, usually 0.250"

TC9338Grand River Dam AuthorityChouteau, OK2


Page 2 of 3 10/14/2015 10:48 AM

Tank 2 GRDA TC9338 Bottom Corrosion

Bottom Corrosion AnalysisTO DETERMINE REPAIR THRESHOLDS Job Number:

AND INSPECTION INTERVALS Customer Name:PER API-653 3rd and 4th EDITION Location:

SECTION 4.4.5 Tank Number:

OUTPUT 1 OF 2: DETERMINE THE INSPECTION INTERVAL BASED ON POSSIBLE REPAIR THRESHOLDS AND PATCH PLATE THICKNESSES

No CPCase #1 Case #2 Case #3 Case #4 Case #5 Case #6 Case #7

Bare Steel Thin Coat Thick Coat Bare Steel Thin Coat Thick Coat LD&CAge of Tank Floor (years) (Age) 36 36 36 36 36 36 36

Inner Plate Topside Corrosion Repair Threshold (RTip) 0.1800 0.1800 0.1800 0.1800 0.1800 0.1800 0.1800

Maximum Inner Plate Topside Corrosion Rate After Repairs (inches per year) (StPr) 0.0019 0.0000 0.0000 0.0019 0.0000 0.0000 0.0019

Maximum Inner Plate Soilside Corrosion Rate After Repairs (inches per year) (UPr) 0.0019 0.0019 0.0019 0.0000 0.0000 0.0000 0.0019

Minimum Remaining Wall Thickness of the Inner Plates Per API-653 (MRT) 0.1000 0.1000 0.0500 0.1000 0.1000 0.0500 0.0500

Sketch Plate Topside Corrosion Repair Threshold (RTipSP) N/A N/A N/A N/A N/A N/A N/A

Maximum Sketch Plate Topside Corrosion Rate After Repairs (inches per year) (StPrSP) N/A N/A N/A N/A N/A N/A N/A

Maximum Sketch Plate Soilside Corrosion Rate After Repairs (inches per year) (UPrSP) N/A N/A N/A N/A N/A N/A N/A

Minimum Remaining Wall Thickness of the Sketch Plates Per API-653 (MRTSP) N/A N/A N/A N/A N/A N/A N/A

Critical Zone Topside Corrosion Repair Threshold (RTipCZ) 0.1950 0.1950 0.1950 0.1950 0.1950 0.1950 0.1950

Maximum Critical Zone Topside Corrosion Rate After Repairs (inches per year) (StPrCZ) 0.0015 0.0000 0.0000 0.0015 0.0000 0.0000 0.0015

Maximum Critical Zone Soilside Corrosion Rate After Repairs (inches per year) (UPrCZ) 0.0015 0.0015 0.0015 0.0000 0.0000 0.0000 0.0015

Minimum Remaining Wall Thickness in the Critical Zone Per API-653 (MRTCZ) 0.1250 0.1250 0.1250 0.1250 0.1250 0.1250 0.1250

Check Patch Plate Thickness for Inner Plates OK OK OK OK OK OK OK

Check Patch Plate Thickness for Sketch Plates N/A N/A N/A N/A N/A N/A N/A

Check Patch Plate Thickness for Critical Zone OK OK OK OK OK OK OK

Inspection Interval After Repairs…

For Inner Plate Corrosion (years) (Or) 20.0 20.0 20.0 20.0 20.0 20.0 20.0

For Sketch Plate Corrosion (years) (OrSP) N/A N/A N/A N/A N/A N/A N/A

For Critical Zone Corrosion (years) (OrCZ) 20.0 20.0 20.0 20.0 20.0 20.0 20.0

INSPECTION INTERVAL (YEARS) 20.0 20.0 20.0 20.0 20.0 20.0 20.0

NEXT SCHEDULED INSPECTION 2035 2035 2035 2035 2035 2035 2035

OUTPUT 2 OF 2: DETERMINE THE REQUIRED REPAIR THRESHOLDS TO ACHIEVE THE DESIRED INSPECTION INTERVAL: 20 Years

No CP

Case #1 Case #2 Case #3 Case #4 Case #5 Case #6 Case #7

Bare Steel Thin Coat Thick Coat Bare Steel Thin Coat Thick Coat LD&C

Repair All Topside Pits on the Inner Plates Greater Than ___ (inches) Deep 0.070 0.095 0.125 0.095 0.150 0.200 0.090

Repair All Soilside Corrosion on the Inner Plates Less Than ___ (inches) in Thickness 0.180 0.155 0.125 0.155 0.100 0.050 0.160

Repair All Topside Pits on the Sketch Plates Greater Than ___ (inches) Deep N/A N/A N/A N/A N/A N/A N/A

Repair All Soilside Corrosion on the Sketch Plates Less Than ___ (inches) in Thickness N/A N/A N/A N/A N/A N/A N/A

Repair All Topside Pits in the Critical Zone Greater Than ___ (inches) Deep 0.055 0.080 0.080 0.080 0.125 0.125 0.055

Repair All Soilside Corrosion in the Critical Zone Less Than ___ (inches) in Thickness 0.195 0.170 0.170 0.170 0.125 0.125 0.195

Developed by JTD, Version 10-8-2004Modified by AF 5-30-2007

Without CP With CP

Without CP With CP

TC9338

Grand River Dam Aut

Chouteau, OK

2


Page 3 of 3 10/14/2015 10:48 AM

Tank 2 GRDA TC9338 Fill Height

Job Number:TO DETERMINE THE ACCEPTABLE Customer Name:

PRODUCT FILL HEIGHT Location:PER API-650 5.6.3 and API-653 4.3.3 Tank Number:

Ref API-650 12th Ed. & API-653 4th Ed Inspection Date:

DESIGN DATA:

34.00 Diameter (FT) 653 API Analysis (new = 650, existing = 653)

24.17 Height (FT) 200 Design Temp. (°F)24.17 Liquid Level (FT) 1.00 Specific Gravity3 Number of Shell Rings

CALCULATIONS:

Shell Shell Product Allowable Joint Calculated Corrosion Thickness Fill Ht

Course Height Fill Ht. Stress Eff. Minimum Allowance Measured Check

Hring (inch) H (ft) S (psi) E Tmin CA (inch) Tactual

Ring No. 1 95.40 24.17 23,595 0.85 0.1021 0.0000 0.2490 OK

Ring No. 2 94.90 16.22 23,595 0.85 0.1000 0.0000 0.1950 OK

Ring No. 3 94.90 8.31 25,960 0.85 0.1000 0.0000 0.1980 OK

Ring No. 4 0.70 0.0000 0.0000

Ring No. 5 0.70 0.0000 0.0000

Ring No. 6 0.70 0.0000 0.0000

Ring No. 7 0.70 0.0000 0.0000

Ring No. 8 0.70 0.0000 0.0000

Ring No. 9 0.70 0.0000 0.0000Ring No. 10 0.70 0.0000 0.0000

23.77 ft Total Ring HeightNominal Volume:

IN Top Angle Ht. (if any) Cu Ft23.77 FT Total Shell Ht. BBL

Refer to API-650 5.6.3 and AAPI-653 4.3.3 for application of the One-Foot method.

For Tmin : The fill height analysis found that this tank was adequate for continued service.

With a product specific gravity of 1 the fill height should be limited to 23.77 feet.

To use a fill height of 24.17 feet, the specific gravity should not exceed 2.44.

NOTES:

Copyright © 2015 Version 1.02

Fill Height Analysis

TC9338Grand River Dam AuthorityChouteau, OK

One-Foot

2

A283-C

A283-C

A283-C

9/23/2015

PlateMaterial

21,9423,908


10/14/2015

TO DETERMINE THE EXTERNAL INSPECTION AND Job Number:ULTRASONIC THICKNESS INSPECTION INTERVAL Customer Name:

PER API-653 4th EDITION, ADDENDUM 3 Location: SECTIONS 6.3.2 and 6.3.3 Tank Number:

Inspection Date:

DESIGN DATA:

34.00 Diameter (FT) 653 API Analysis24.17 Height (FT) 200 Design Temp. (°F)24.17 Liquid Level (FT) 1.00 Specific Gravity3 Number of Shell Rings 1/1/1979 Date of Construction 36.73 years

11/13/2012 Date of Prev. Inspection 2.86 years

ANALYSIS CRITERIA:

1) Corrosion rates were determined by minimum thicknesses of the shell rings.

2) This analysis did short-term corrosion rates.

3) This analysis compares the corrosion rate of

4) Minimum thickness was calculated using the One-Foot method.

5) Joint efficiency is 1.0 unless the corrosion is within 1 inch of a weld or 6 inches of a rivet.

CALCULATIONS:

Shell Joint Allowable Calculated Remaining

Course Eff. Stress Minimum Nominal Previous Current Long-term Short-term Critical LifeE S (psi) Tmin Tnom Tpreviousl Tactual (in/yr) (in/yr) (in/yr) (yr)

Ring No. 1 1.00 23,595 0.1000 0.2810 0.0000 0.2490 0.00087 N/A 0.00087 171.01

Ring No. 2 1.00 23,595 0.1000 0.2190 0.0000 0.1950 0.00065 N/A 0.00065 145.38

Ring No. 3 1.00 25,960 0.1000 0.2190 0.0000 0.1980 0.00057 N/A 0.00057 171.40

Ring No. 4 0.0000 0.0000

Ring No. 5 0.0000 0.0000

Ring No. 6 0.0000 0.0000

Ring No. 7 0.0000 0.0000

Ring No. 8 0.0000 0.0000

Ring No. 9 0.0000 0.0000

Ring No. 10 0.0000 0.0000

Minimum remaining life: 145.38 yr

External inspection interval (5 yr max): 5.00 yr Next external inspection by: Sep 2020

Ultrasonic testing interval (15 yr max): 15.00 yr Next UT reading by: Sep 2030

NOTES:

Copyright © 2015 Version 1.02

not consider

9/23/2015

Corrosion Rate Analysis

TC9338

Grand River Dam Authority

Chouteau, OK

2

Corrosion RateThickness

all shell rings.

TC9338 Grand River Dam Authority Chouteau, OK Tank 2 Page 1 of 19

1A 1B

1C 1D


2A 2B

2C 2D


3A 3B

3C 3D


4A 4B

4C 4D


5A 5B

5C 5D


6A 6B

6C 6D


7A 7B

7C 7D


8A 8B

8C 8D


9A 9B

9C 9D


10A 10B

10C 10D


11A 11B

11C 11D


12A 12B

12C 12D


13A 13B

13C 13D


14A 14B

14C 14D


15A 15B

15C 15D


16A 16B

16C 16D


17A 17B

17C 17D


18A 18B

18C 18D


19A 19B

19C 19D

Documents

api-653 internal tank inspection evaluation - · PDF fileAPI-653 INTERNAL TANK INSPECTION EVALUATION Tank No: 2 September 23, 2015 Chouteau, OK Grand River Dam Authority TC9338