Tank Inspection Bradley Field-Fac 10417 (Tank 1)-FINAL-2016.pdf

US Army Corps of Engineers

Omaha District

API 653 Out-of-Service

Inspection Report

Bradley Field Air National Guard

Facility 10417

Tank 1 US Army Corps of Engineers Center of Expertise for Petroleum, Oils and Lubricants

(USACE POL-TCX)

9/16/2016

API 653 Out-of-Service Inspection Report Hartford, Connecticut

Table of Contents

ACRONYMS AND ABBREVIATIONS

GENERAL SUMMARY

INSPECTION DATE

PREVIOUS INSPECTION DATES

RECOMMENDED FUTURE INSPECTION DATES (CALCULATIONS SHALL BE PROVIDED)

GENERAL TANK INFORMATION

A. GENERAL PROJECT INFORMATION

1. API 653 Inspection

2. Site Information

B. TANK INSPECTION COMMENTS

1. Tank Construction

2. Tank Foundation

3. Cathodic Protection (CP)

4. Tank Bottom

5. Internal Floating Roof

6. Tank Shell

7. Fixed Roof

8. Tank Appurtenances

a. Tank Shell

b. Internal Floating Roof

c. Fixed Roof

d. Gauging

e. Level Alarms

f. Stairs and Platforms

g. Grounding and Bonding

9. Tank Coating

10. Tank Piping System

11. Fire Protection System

12. Secondary Containment

C. FINDINGS AND RECOMMENDATIONS

1. MANDATORY REPAIRS per API 653, UFC 3-460-01, or AW 78-24-27 Standards

2. RECOMMENDED REPAIRS to Fully Comply with API 653, UFC 3-460-01, or AW 78-24-27 Standards13

3. RECOMMENDED REPAIRS as Part of Regular Maintenance

D. INSPECTION INTERVALS

1. Routine In-service Inspection

2. External (In-Service) Inspection

3. Ultrasonic Thickness Inspection

4. Internal (Out-of-Service) Inspection

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

Drawing A-1, Tank Bottom Layout

Table 1 – Tank Bottom Ultrasonic Thickness Readings

Table 2 – Tank Bottom Critical Zone Ultrasonic Thickness Readings

Tank Bottom Service Life Evaluation

Table 3 – Center Sump Thickness Data

API 653 Appendix B Settlement Evaluation

Table 4 – Tank Bottom Elevation Measurements

Drawing A-2, Shell Layout

Table 5 – Shell Plate Ultrasonic Thickness Readings

Shell Service Life Evaluation

Out-of-Roundness Evaluation

Drawing A-3, Fixed Roof Layout

Table 6 – Fixed Roof Ultrasonic Thickness Readings

Fixed Roof Service Life Evaluation

Table 7 - Nozzles and Appurtenances

Table 8 - Dry Film (Coating) Thickness Measurements

OSHA Access Structure Report

APPENDIX B: API 653 CHECKLISTS FOR TANK INSPECTIONS

APPENDIX C: PHOTOGRAPHS

ACRONYMS AND ABBREVIATIONS

AFFF Aqueous Film Forming Foam

ANG Air National Guard

API American Petroleum Institute

ASNT American Society of Non-Destructive Testing

AST Aboveground Storage Tank

ATG Automatic Tank Gauge

AVG Average

BBL Barrel

BMP Best Management Practice

CFR Code of Federal Regulations

CP Cathodic Protection

DB&B Double Block and Bleed

DFT Dry Film Thickness

GE General Electric

HHLA High-High Level Alarm

HLA High Level Alarm

HLCV High Level Control Valve

IAW In Accordance With

ICCP Impressed Current Cathodic Protection

IFR Internal Floating Roof

JET-A Jet Fuel

LLA Low Level Alarm

LLLA Low-Low Level Alarm

MFL Magnetic Flux Leakage

NDT Non-Destructive Testing

NFPA National Fire Protection Association

OOS Out-of-Service

OSHA Occupational Safety and Health Administration

RCA Remaining Corrosion Allowance

TRV Thermal Relief Valve

UFC Unified Facilities Criteria

USACE United States Army Core of Engineers

UTT Ultrasonic Thickness Testing

VT Visual Testing

W/ With

W/O Without

GENERAL SUMMARY

POND was under contract to the United States Army Corps of Engineers (USACE), Omaha District, to perform an out-of-service (OOS) American Petroleum Institute (API) 653 tank inspection for Tank 1 (Facility 10417) at Bradley Field

Air National Guard (ANG) in Hartford, Connecticut.

The OOS API 653 inspection was performed 23-25 August 2016 in accordance with (IAW) API 653, 5th Edition.

Results of the inspection and testing activities identified recommended repairs and upgrades required to comply with API 650 / 653, Unified Facilities Criteria (UFC) 3-460-01 / 3-460-03, AW 78-24-27, and industry standards.

Contained in this report is a detailed account of the tank inspection, non-destructive testing (NDT) methods performed, and conclusions derived from the inspection and testing activities. Findings from this inspection are further detailed in Section B of this report. Repairs and upgrades identified in this section are further classified and listed in Section C of this report.

INSPECTION DATE

API Out-of-Service (OOS) Inspection Date: 23-25 August 2016

Equipment Used:

Manufacturer: MFE Enterprises Tank Floor Scanner

Model Number: MFE 2412 Mark III

Calibration Method: Calibration plate with known defects

Manufacturer: GE Krautkramer Ultrasonic Thickness Gauge w/ Topcoat

Model Number: DMS GO+

Calibration Method: 1-point calibration using 2 material standards

Manufacturer: Fisher Technologies Dry Film Thickness (DFT) Gauge

Model Number: Dual Scope MPOR

Calibration Method: Calibration to known thickness standard

Manufacturer: Johnson Self-Leveling Rotary Laser Level

Model Number: 40-6515

Calibration Method: Self-leveling

Inspector(s):

Brian A. Hopper

Andrew Morissette

PREVIOUS INSPECTION DATES

API Out-of-Service (Internal) Inspection Date: 14 June 2006

API In-Service (External) Inspection Date: 14 June 2006

RECOMMENDED FUTURE INSPECTION DATES (CALCULATIONS SHALL BE PROVIDED)

Routine In-Service: Monthly

Out-of-Service (Internal): 25 August 2036 (API)

25 August 2026 (UFC)

In-Service (External) w/o UTT: 25 August 2021 (API)

In-Service (External) w/ UTT: 25 August 2031 (API)

API 653 Inspector / Prepared By: Reviewed By:

Brian A. Hopper Brian W. Lunsford, P.E

Integrity Engineer Mechanical Integrity Program Manager

API 653 Inspector No. 56198 API 653 Inspector No. 28526

ASNT NDT Level II

GENERAL TANK INFORMATION

ITEM DESCRIPTION

Owner U.S. Air Force

Location Bradley Field ANG

Facility Number 10417

Tank Number 1

State / Country Connecticut / United States

City Hartford

Inspection Date 23-25 August, 2016

Tank Manufacturer Witherup Fabrication and Erection

Design Standard API 650, 8th Edition Appendix H

Date of Construction 1993

Tank Contents Jet-A

Tank Diameter 32’-9”

Shell Height 20’-9”

Product Height 17’-0”

Tank Capacity 2,500 Barrels (BBLS)

Foundation Concrete Ring Wall

Construction

Bottom Cone-Down / Butt-Welded Radial Steel Plates

Shell Butt-Welded Steel Plates / Three (3) Shell Courses

Floating Roof Aluminum Honeycomb Pan with Double Wiper Seal System

Fixed Roof Lap-Welded Steel Plates / Cone-Up / Self Supported

Material

Bottom A-36 Modified

Shell A-36 Modified

Floating Roof Aluminum

Fixed Roof A-36 Modified

Cathodic Protection Impressed Current Cathodic Protection (ICCP) System

Interior Coating System Epoxy

Exterior Coating System Epoxy

Level Gauging Shand & Jurs Tape Level Gauge / Varec Servo Probe / Barton Automatic Tank

Gauge (ATG)

Overfill Protection High Level Control Valve (HLCV) and HLCV Shutoff Switch

Piping Receipt 6” Flanged / Stainless Steel

Issue 8” Flanged / Stainless Steel

Low Suction 3” Flanged / Stainless Steel

Water Draw-Off 1” Flanged / Stainless Steel

Level Alarms Low-Low Level Alarm (LLLA) / Low Level Alarm (LLA) / High Level Alarm (HLA) /

High-High Level Alarm (HHLA)

A. GENERAL PROJECT INFORMATION

1. API 653 Inspection

An OOS API 653 inspection was performed 23-25 August 2016 for Tank 1 (Facility 10417). Results of the inspection and testing activities identified recommended repairs and upgrades required to comply with

API 650 / 653, UFC 3-460-01 / 3-460-03, AW 78-24-27, and industry standards.

2. Site Information

Bradley Field ANG is located in Hartford, Connecticut and is home to the 103rd Airlift Wing, more commonly known as the “Flying Yankees”. The mission of the 103rd Airlift Wing is to train, organize, and equip personnel so they can deploy and employ in support of national objectives as directed, support the governor’s office, aid in emergencies, and participate in programs benefiting the community.

B. TANK INSPECTION COMMENTS

1. Tank Construction

Tank 1 is a welded, steel, single-wall, vertical aboveground storage tank (AST). The tank was constructed in 1993 by Witherup Fabrication and Erection IAW API 650, Appendix H, 8th Edition. The tank is 32’-9” in diameter and 20’-9” high with a nominal capacity of 2,500 BBL. The maximum fill height is 17’-0” and is restricted to the bottom of the shell overflow ports. The previous NDT records from the previous inspection and the original construction drawings were available for review and comparison. The existing nameplate for Tank 1 specifies the purchaser’s tank number as Tank 2.

2. Tank Foundation

Tank 1 rests on a 1’-6” tall concrete ring wall. Four (4) leak detection tell-tale pipes are equally spaced around the foundation. Eight (8) anchor chairs are equally spaced around the tank perimeter. Various locations of the tank chime were cut to accommodate the anchor bolts and the bottom plate projection past the tank shell does not meet the minimum requirement of 3/8”, which is specified by API 650 / 653.

It is evident that these areas are coated and from initial fabrication and do not show indications of active corrosion. Sealant is not provided at the tank chime-to-ringwall interface, anchor bolt penetrations, or grounding cable conduit penetrations to prevent water ingress beneath the tank bottom. Water in direct contact with the tank bottom can lead to accelerated corrosion and as a result, lower the service life of the tank.

3. Cathodic Protection (CP)

The tank bottom is protected by an ICCP system. CP readings taken during the inspection indicate the CP system is functioning and adequately protecting the tank bottom.

4. Tank Bottom

The tank bottom is of cone-down construction with butt-welded steel radial plates and a 29” diameter, 18” deep center sump. NDT was performed on the tank bottom including visual testing (VT), ultrasonic thickness testing (UTT), and a magnetic flux leakage (MFL) scan. Five (5) UTT readings were taken on each radial plate and center plate. One (1) UTT reading was taken every 3 feet around the tank perimeter within the tank bottom critical zone. The MFL scan and UTT prove-up identified two (2) indications of soil-side corrosion with a minimum measured thickness of 0.187” and 0.213”. Each indication had a service life greater than 20 years; therefore, no repairs are required at this time. VT was performed along the bottom plate welds and center sump welds. One (1) 3” linear indication of lack of fusion was identified in the shell-to-bottom weld. Two (2) pin-holes were identified in one (1) water draw-off and one (1) low suction pipe support bearing plate welds. VT examination was limited due to the internal coating. An internal settlement survey was performed in the tank and no indications of excessive settlement were observed. The internal receipt diffuser is welded directly to the tank bottom.

Refer to Drawing A-1, “Bottom Layout” and Table 1, “Tank Bottom Ultrasonic Thickness Readings” in

Appendix A for plate locations and thickness data.

5. Internal Floating Roof

The tank is provided with an aluminum honeycomb internal floating roof (IFR). The IFR was originally equipped with foam log primary and secondary seals which were replaced with a double wiper seal system as part of this inspection. The IFR was examined using VT methods. No gross defects nor damages were observed during the inspection. The IFR rests on six (6) 2 ½” aluminum support legs. Each support leg is provided with a stainless steel landing pad sealed to the tank bottom. Manway 2 is equipped with an aluminum filler drum to allow the IFR to move up and down freely past the nozzle neck. The tank is currently not equipped with an internal ladder to allow access to the IFR while the tank is in service.

6. Tank Shell

The tank shell is equipped with three (3) butt-welded A-36 modified steel shell courses. Shell plates and welds were examined using UTT and VT methods. Nine (9) UTT measurements were taken on the lower shell course and nine (9) UTT measurements were taken on the upper shell courses adjacent to the spiral staircase. UTT readings indicated no significant metal loss on the shell plates.

Refer to Drawing A-2, “Shell Roll-Out” and Table 5, “Shell Ultrasonic Thickness Readings” in Appendix A for plate location and thickness data.

7. Fixed Roof

The self-supported fixed roof is of cone-up construction with fully coated lap-welded steel plates. Fixed roof plates were examined using UTT and VT methods. Five (5) UTT measurements were taken on each full plate and four (4) UTT measurements were taken on each sketch plate. UTT readings indicated no significant metal loss on the fixed roof plates. The circulation vent adjacent to the spiral staircase currently has a vertical spacing of 6 feet 6 inches to the leading edge of the spiral stair tread. Occupation

Safety and Health Administration (OSHA) requires a minimum clearance of 7 feet as specified in 29 Code of Federal Regulations (CFR) 1910, Subpart D, 1910.23.10.

Refer to Drawing A-3, “Fixed Roof Layout” and Table 6, “Fixed Roof Ultrasonic Thickness Readings” in

Appendix A for plate location and thickness data

8. Tank Appurtenances

a. Tank Shell

Tank shell nozzles consist of two (2) 36” manways, one (1) 6” product receipt, one (1) 12” main suction, one (1) 3” low suction, one (1) 3” water draw-off, two (2) 1” aqueous film forming foam

(AFFF) sensors, one (1) ¾” thermometer port (removed dial gauge), two (2) 1” HLA/HHLA penetrations, two (2) 1” LLA/LLLA penetrations, two (2) 1” HLCV shutoff switch penetrations, and one (1) 8” AFFF chamber. One (1) UTT measurement was taken on each accessible nozzle with a welded connection and reinforcement pad. The main suction reinforcement pad is welded

FSO9146

Sticky Note Staten: AFPET non-concur for ladder install. Not needed. Most bases can't even get clearance to enter a tank with fuel in it. This tank is small and inspections can be conducted from vents. Top of pan can be accessed during Out of Service from manhole on pan.

directly to an anchor chair. Weld spacing between the lower weld toe of Manway 1 reinforcement pad and the tank chime does not meet minimum spacing requirements of 3” as specified by API 650. The HLCV tubing steel attachment plate located adjacent to Manway 1 reinforcement pad does not meet the minimum weld spacing of 6” as required by API 650.

Manway 1 and Manway 2 are not provided with davit arms to allow for easy removal during cleaning and inspection activities. Shell manways are currently provided with carbon steel bolts which are heavily coated and exhibit corrosion.

Refer to Drawing A-2, “Shell Roll-Out” and Table 7, “Nozzles and Appurtenances” in Appendix A for nozzle location and data.

b. Internal Floating Roof

The IFR is equipped with one (1) 30” manway, one (1) 24” tape level gauge float well, and one

(1) 30” manway with a vacuum breaker. The tank is currently only equipped with one (1) anti-rotation cable. A grounding strap is currently not provided at the 30” manway.

c. Fixed Roof

Fixed roof nozzles consists of one (1) 12” Varec servo probe, one (1) 24” hatch with the Barton

ATG, one (1) 2’-0” x 6’-0” IFR installation hatch, one (1) 24” center vent, one (1) 2” tape level gauge penetration, and one (1) 24” inspection hatch. One (1) UTT measurement was taken on each nozzle with a welded connection and reinforcement pad. The center vent screens are damaged with large gaps present. The Varec servo probe is equipped with a partially slotted stilling well. A fully slotted stilling well is not provided for the Barton ATG. The Barton ATG probe is routed through a funnel penetration in the IFR.

Refer to Drawing A-3, “Fixed Roof Layout” and Table 7, “Nozzles and Appurtenances” in

Appendix A for nozzle location and data.

d. Gauging

Automatic tank gauging is performed using the Barton ATG. The tank is also equipped with a

Shand & Jurs tape level gauge and Varec Servo probe for automatic tank gauging; however, these are inoperable per facility personnel. Manual gauging and sampling operations are not possible due to the ATG probes and cables being located in the manual gauging hatch nozzle.

e. Level Alarms

The tank is provided with LLLA, LLA, HLA, and HHLA. The level alarm settings are 10 3/8”, 2’ –

7 1/16”, 14’ – 7 15/16”, and 16’ – 4 5/8” respectively.

f. Stairs and Platforms

The tank is provided with a spiral staircase, work platform at Manway 2, and upper platform at the fixed roof. The clearance between Manway 2 and the handrail is 1’-4” and does not allow easy passage to the fixed roof or removal of the manway cover. An approach step of adequate size is not provided to allow easy access to the spiral staircase. There is currently no access point for the HLCV shutoff switch and HLA.

g. Grounding and Bonding

The tank is equipped with four (4) grounding lugs and cables that are in good overall condition with no signs of damage or detachment. Grounding cable conduit penetrations are not provided with sealant. The spiral staircase is not equipped with a personnel grounding station at the stair entry point.

9. Tank Coating

All exterior and internal surfaces of the tank are coated and were tested using a DFT gauge. The internal surface of the tank bottom exhibits widespread blistering with approximately 15 ft2 of coating failure and spot base metal exposure adjacent to the Varec servo probe stilling well. The coating at the center sump and adjacent plates exhibits widespread blistering and poor application. The internal shell coating is in moderate condition with indications of corrosion bleed through on the upper shell courses. The internal fixed roof is fully coated with spot locations of flaking and general surface corrosion on the associated roof rafters. The external tank shell is fully coated and exhibits widespread deterioration and surface corrosion bleed through. The external fixed roof coating is in moderate condition with widespread deterioration, corrosion bleed through, and bio-growth.

Refer to Table 8, “Dry Film (Coating) Thickness Measurements”, for internal and external coating thickness measurements.

10. Tank Piping System

The external piping consists of 6” stainless steel for the receipt, 8” stainless steel for the main suction, and 3” stainless steel for the low suction. A ball valve is provided on the low suction at the tank shell. One

(1) U-bolt support within the containment dike is welded directly to the receipt piping for Tank 1.

External piping is supported by a mixture of adjustable and fixed wall mounted supports. One (1) fixed wall mounted support is not supporting the receipt piping. Rubber pads at each of the supports are damaged or missing and allowing metal-to-metal contact. The external and internal stainless steel piping is welded directly to the tank shell. Internal piping consists of stainless steel piping provided with fixed supports which are not adequately supporting the internal piping. Internal pipe supports are provided with square corner bearing plates. Internal flanges are not provided on the main suction, low suction, and receipt internal piping at the tank shell. The internal receipt diffuser is equipped with four (4) supports, which are welded directly to the tank bottom and diffuser pipe. The internal piping for the main suction currently extends to the center of the tank and terminates directly over the center sump.

Double-block and bleed (DB&B) valves are provided on the main suction and receipt piping at the tank shell and the low suction is equipped with a ball valve. Facility personnel state that the DB&B valves get stuck during the hotter months making operations difficult. The main suction and receipt piping are equipped with thermal relief valves (TRVs) at their respective skin valves. Two (2) TRVs are rated for vapor service and the associated thermal relief piping is threaded and equipped with sight flow indicators.

11. Fire Protection System

The tank is equipped with two (2) sensors for the AFFF system and one (1) AFFF chamber. A fully contact aluminum IFR also serves as an interior fire protection system for Jet-A fuel. The AFFF piping adjacent to the upper shell courses exhibits coating failure with widespread flaking.

12. Secondary Containment

Tank 1 is located within a 63’-0” x 63’-0” x 4’-0” concrete containment dike. Approximately 550 linear feet of sealant at the concrete dike floor control joints are missing or compromised and filled with sand and debris. Dike wall piping penetrations are equipped with link seals. The secondary containment dike drain was hydrostatically tested during the inspection. The drain was filled three (3) different times, and each time the liquid level deviated approximately 1 ½” over 30 minutes. Facility personnel indicate that the containment drain valve does not fully seal, allowing the dike to drain freely into the oil-water separator.

C. FINDINGS AND RECOMMENDATIONS

The following subsections outline the itemized tank repairs/upgrades. Repairs and upgrades shall be completed

IAW API requirements and best engineering practice.

1. MANDATORY REPAIRS per API 653, UFC 3-460-01, or AW 78-24-27 Standards

Mandatory repairs represent items that require immediate attention, in order to prevent imminent risk to system operators, equipment integrity, or the adjacent environment. The tank should remain OOS until these repairs are completed.

No mandatory repairs are required for continued service.

2. RECOMMENDED REPAIRS to Fully Comply with API 653, UFC 3-460-01, or AW 78-24-27 Standards

Recommended repairs represent items that should be addressed in a timely manner in order to prevent future potential risks to system operators, equipment integrity, or the adjacent environment. These items may be required by Federal, State and Local Codes or by Military Criteria.

a. Secondary Containment Drain

OBSERVATION: A hydrostatic test was performed on the secondary containment drain to validate the hydraulic integrity of the drain line and valves. The water level deviated multiple times during the day indicating the drain is leaking. Facility personnel state that the drain valve has a history of malfunctioning and not holding water in the containment dike.

CODE REFERENCE: UFC 3-460-01, 8-14.1 / 40 CFR Part 112, Subpart B, 112.8

RECOMMENDATION: Replace the containment drain valve and perform a hydrostatic test to verify the hydraulic integrity of the drainage system.

FSO9146

Staten: This needs to be corrected prior to tank being placed back in service.

POL-MCX: Per SOW, the drain inlet, valve and drain pipe should be isolated and tested separately to determine which specific component is leaking. Concur with current recommendation, based on facility personnel reports.

b. Tank Chime-to-Ring Wall Interface

OBSERVATION: No sealant is provided at the tank chime-to-ringwall joint, anchor bolt penetrations, nor grounding cable conduit penetrations.

CODE REFERENCE: UFC 3-460-03, 8-4.1.B

RECOMMENDATION: Provide approximately 125 linear feet of ultraviolet resistant, fuel resistant, flexible sealant at the tank chime-to-ringwall joint, anchor bolt penetrations, and grounding cable conduit penetrations.

c. Containment Dike Control Joint Sealant

OBSERVATION: Approximately 550 linear feet of concrete containment dike control joint sealant is missing or disbonded and cracking.

CODE REFERENCE: UFC 3-460-03, 8-10.2.2.B

RECOMMENDATION: Provide approximately 550 linear feet of flexible, UV-resistant, fuel resistant sealant in the control joints within the concrete containment dike.

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POL-MCX: Concur. Relocate conduits to side of ring wall IAW AW 78-24-27.

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POL-MCX: Concur.

d. Teflon Pads at Pipe Supports

OBSERVATION: The thin rubber pads between the supports and the pipe within the containment dike are either missing or damaged and allowing metal-to-metal contact.

CODE REFERENCE: UFC 3-460-01, 9-3.2

RECOMMENDATION: Provide eight (8) Teflon, or equivalent, isolation pads at pipe supports within the containment dike.

e. Welded U-Bolt Supports

OBSERVATION: There is currently one (1) U-bolt support welded directly to the stainless steel pipe adjacent to the pump house. This is the only anchored support within the containment dike. Adjacent supports include hanger supports within the pump house and cradle supports.

CODE REFERENCE: UFC 3-460-01, 9-3.4

RECOMMENDATION: Perform a pipe stress analysis to determine if this anchored support is required.

If an anchor support is required, replace the u-bolt support with a standard anchor support IAW UFC requirements.

POL-MCX: Concur.

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f. Receipt Wall Support

OBSERVATION: The existing wall mounted pipe support is not supporting the receipt line for Tank 1.

CODE REFERENCE: UFC 3-460-01, 9-3.2

RECOMMENDATION: Rework one (1) wall support to provide adequate support for the 6” receipt piping. Provide Teflon, or equivalent, isolation pad between the pipe and support.

g. Provide Davit Arms at Manway 1 and Manway 2

OBSERVATION: Both manways are not equipped with a davit arm to allow for easy removal during cleaning and inspection activities.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item f / AW 78-24-27

RECOMMENDATION: Provide davit arms at Manway 1 and Manway 2. Modification of the work platform at Manway 2 is required to accommodate the swing of the davit arm and to meet the Occupational

Safety and Health Administration (OSHA) requirements. See Recommendation h.

POL-MCX: Pipe stress analysis may determine if an additional anchored support is required at these locations. Concur with recommendation if anchored support is not required by pipe stress analysis.

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POL-MCX: Concur. Replace entire staircase to meet the minimum required width of 28".

h. Work Platform at Manway 2

OBSERVATION: The work platform currently has a 1’-4” clearance between the manway and handrail.

CODE REFERENCE: API 650, 5.8.10 / 29 CFR Part 1910, Subpart D

RECOMMENDATION: Rework the existing work platform at Manway 2 to meet requirements of API 650 and OSHA 29 CFR 1910, Subpart D.

i. Provide Standard Concrete Approach Step

OBSERVATION: Existing approach step was created by the facility to create ease of access to the spiral staircase and does not meet size requirements. The first step of the spiral staircase is approximately

27” above the containment dike floor and 15” above the approach step.

CODE REFERENCE: API 650, 5.8.10 / AW-78-24-27

RECOMMENDATION: Provide approach step IAW API 650 and AW-78-24-27, meeting the requirements of 29 CFR Part 1910, Subpart D.

POL-MCX: Concur. Replace entire staircase to comply with minimum required width of 28".

G6CDQASM

POL-MCX: Concur. The approach step shown in the DoD standard will have to be modified to comply with OSHA for this location.

j. Low Suction Ball Valve

OBSERVATION: A 3” ball valve is installed on the low suction line.

CODE REFERENCE: UFC 3-460-01, 12-9

RECOMMENDATION: Replace the 3” ball valve on the low suction with a DB&B valve to provide adequate isolation during cleaning and inspection activities.

k. Sight Flow Indicators

OBSERVATION: The thermal relief crossover piping at the main suction and receipt are equipped with sight flow indicators.

CODE REFERENCE: UFC 3-460-01, 9-3.5.1

RECOMMENDATION: Remove sight flow indicators and replace with spool pieces. See Recommendation

M for thermal relief crossover piping modifications.

POL-MCX: Concur.

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l. Vapor Service TRVs

OBSERVATION: Vapor service TRVs are provided on the main suction and receipt lines.

CODE REFERENCE: UFC 3-460-01, 9-3.5.2

RECOMMENDATION: Verify the required set capacity needed for the TRVs and replace the two (2) vapor service TRVs with TRVs rated for liquid service.

m. Threaded Thermal Relief Piping

OBSERVATION: Main suction and receipt 1” thermal relief piping is threaded.

CODE REFERENCE: UFC 3-460-01, 9-8.(j)

RECOMMENDATION: Replace threaded piping with welded and/or flanged connections.

POL-MCX: Concur.

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n. Coating

OBSERVATION: The external shell, external roof, and internal shell coatings exhibit widespread coating failure and general surface corrosion. Spot coating failure was identified on the tank bottom and internal surface of the fixed roof and rafters.

CODE REFERENCE: UFC 3-460-03, 8-3

RECOMMENDATION: Recoat the approximately 5,800 square feet of the entire external surface of the fixed roof, external and internal shell, and provide spot coating repair on the tank bottom and fixed roof and rafters. Replace the MIL-STD-161G labeling and National Fire Protection Association (NFPA) diamond after coating completion.

o. Product Recovery System

OBSERVATION: The tank is currently not equipped with a dedicated product recovery system. Water is removed from the tank via a 3” water draw-off nozzle.

CODE REFERENCE: UFC 3-460-01, 8-3.14.3 / AW-78-24-27

RECOMMENDATION: Provide a standard 55 gallon product recovery system IAW AW-78-24-27 inside the containment dike. Cut off the existing drain piping penetrating the containment dike floor and cap the line with concrete. Provide a 2” DB&B valve on the water draw-off piping for positive isolation.

Staten: Go ahead and 100% re-coat both internal and external to include bottom and bottom of roof. Us new 2 part system instead of old 3 part.

POL-MCX: Concur.

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p. Enraf ATG System

OBSERVATION: The existing ATG system is a Barton ATG with a probe routed through a funnel in the

IFR. A striker plate is not provided beneath the ATG probe.

CODE REFERENCE: AW-78-24-27 / UFC 3-460-01, Table 8-1, Items R & S

RECOMMENDATION: Remove the existing Barton ATG system and replace with an Enraf system and

Vito temperature/water probe. The Enraf ATG and temperature/water probe should be provided with fully slotted stilling wells and datum plates IAW AW-78-24-27. Locate the temperature/water probe as close to the center of the tank as feasible. Reuse and slot the existing VAREC servo probe stilling well and ensure proper connection at the tank bottom and fixed roof.

q. Weld Spacing

OBSERVATION: The main suction reinforcement pad is a 3/4 circle and is welded directly to an anchor chair. Weld spacing between Manway 1 reinforcement pad and the tank chime does not meet the requirements of API 650. The HLCV tubing support is welded at the edge of Manway 1 reinforcement pad.

CODE REFERENCE: API 650, 5.8.1.2

RECOMMENDATION: Areas not meeting minimum weld spacing requirements shall have NDT performed to determine if any problems exist with the connections. Provide repairs as necessary to eliminate excessive stress at tank attachments.

POL-MCX: Concur with relocation of water/temp probe closer to sump. Install 8" manual tank gauge well with gauger's hatch at location shown. Replace Varec probe with Enraf ATG and slot well. Base of wells shall be IAW AW Standard.

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POL-MCX: Concur. Provide NDT at locations of 3-sided welds on anchor chairs. If chime extension is replaced per Item r, ensure new anchors have holes cut out where 3-sided welds would be.

r. Tank Chime Spacing

OBSERVATION: The tank chime was cut-out in several locations to accommodate anchor bolts.

Projection of the bottom plate beyond the outside toe of the shell-to-bottom weld is less than 3/8”.

These areas were cut during initial fabrication and aggressive corrosion is not evident as these areas are coated.

CODE REFERENCE: API 653 4.4.5.7

RECOMMENDATION: Perform NDT at these areas to determine if repairs are required. If not, monitor during future inspections for propagation.

s. Main Suction

OBSERVATION: The main suction currently terminates directly over the center sump.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item V / AW-78-24-27

RECOMMENDATION: Rework the main suction internal piping to extend ½ the tank radius.

POL-MCX: Major repair required. Cut out outer section of bottom plates, remove shell-to-bottom weld and install annular ring IAW API 650. Modify anchor chairs so that the chime extension will not require notches.

G6CDQASM

POL-MCX: Concur. Provide round anti-vortex plate 2 times the diameter of the pipe.

t. Weld Defects

OBSERVATION: There is currently one (1) 3” linear indication of lack of fusion on the shell-to-bottom weld and two (2) pinholes located in one (1) water draw-off support and one (1) low suction pipe support bearing plate seal welds.

CODE REFERENCE: API 653 12.1.3 & 12.1.6

RECOMMENDATION: Repair linear indication of lack of fusion and pinholes IAW API 653.

u. Internal Pipe Supports

OBSERVATION: The existing internal supports are not supporting the pipe and are provided with square corner bearing plates.

CODE REFERENCE: API 653, 9.10.3.1 / AW-78-24-27

RECOMMENDATION: Replace existing supports with adjustable type supports per current design standards and rework bearing plate corners to have a minimum 2” radius.

POL-MCX: Concur.

G6CDQASM

POL-MCX: Concur with installation of adjustable support. NDT bearing plates.

v. Receipt Diffuser Supports

OBSERVATION: Supports for the diffuser are welded directly to the diffuser and tank bottom. The supports are not provided with bearing plates.

CODE REFERENCE: AW-78-24-27 / API 653, Fig 9.13

RECOMMENDATION: Provide standard design supports for the diffuser IAW current design standards and provide bearing plates beneath the supports. The bearing plate corners should have a minimum

2” radius.

w. Internal Piping Flanges and Nozzle Connections

OBSERVATION: Shell nozzles penetrations are equipped with a single external flange. Internal and external stainless steel piping is welded directly to the tank shell.

CODE REFERENCE: UFC 3-460-01, Plate 016 / AW-78-24-27

RECOMMENDATION: Provide internal and external carbon steel flange and nozzle connection to the tank shell at the main suction, low suction, and receipt piping. Provide insulating flange kit at new external flange connections and rework existing internal piping for flanged connection.

POL-MCX: Concur.

G6CDQASM

x. Internal Ladder

OBSERVATION: The tank is currently not equipped with an internal ladder to access the IFR.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item I / AW-78-24-27

RECOMMENDATION: Replace the existing 24” inspection hatch on the fixed roof with a 30” manway.

Provide an internal ladder per current standard designs and provide stenciling on the manway to identify “Confined Space Entry”.

y. Replace Center Vent Screens

OBSERVATION: Existing center vent screens exhibit damage and gaps in excess of ¾”.

CODE REFERENCE: API 650, 5.8.5.5 / AW-78-24-27

RECOMMENDATION: Replace existing screens with stainless steel bird screens tack welded around opening.

Staten: Ladder is overkill and not needed. Tank is small and pan can be inspected from the vents. When out of service pan can be accessed through second course man-way or pan manhole.

POL-MCX: If not installing ladder, consider removing hatch cover and permanently sealing penetration with cover plate.

G6CDQASM

z. Manual Gauging Hatch

OBSERVATION: The tank is currently not equipped with a manual gauging hatch for manual gauging and sampling operations.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item T / AW-78-24-27

RECOMMENDATION: Provide an independent gauging hatch, stilling well, and datum plate IAW current design standards.

aa. HLA and HLCV

OBSERVATION: There is currently no access to the HLCV shutoff switch and HLA.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item L

RECOMMENDATION: Relocate the HLA and HLCV to be accessible from the spiral staircase. Modify the stair tread length to meet OSHA requirements where HLA and HLCV shutoff switch are relocated.

POL-MCX: Concur. Install at location shown in photo.

G6CDQASM

bb. Grounding Station at Spiral Stairs

OBSERVATION: A personnel grounding station is currently not provided at the base of the stairs.

CODE REFERENCE: AW-78-24-27

RECOMMENDATION: Provide personnel grounding station at the base of the spiral staircase and tie into the existing tank grounding system.

cc. Relocate Circulation Vent

OBSERVATION: Clearance between the roof mounted circulation vent and stair treads is less than 7 feet as required by OSHA requirements.

CODE REFERENCE: 29 CFR Part 1910, Subpart D, 1910.23.10

RECOMMENDATION: Relocate circulation vent to adjacent location to allow for adequate clearance between the stair tread and overhead object.

Staten: Will stairs be moved for manway platform work and high level control work?

POL-MCX: Yes, complete stair modification recommended. Installation of second platform will remove the issue of overhead clearance at the vent.

G6CDQASM

dd. Anti-Rotation Cable

OBSERVATION: The tank is currently only equipped with one (1) anti-rotation cable.

CODE REFERENCE: API 650 H.5.4 / UFC 3-460-01 8-8.3.(d)

RECOMMENDATION: Provide one (1) additional anti-rotation cable or a guide pole with rollers. Provide a bearing plate beneath the anti-rotation cable tank bottom attachment.

ee. Grounding Strap at IFR Manway

OBSERVATION: The IFR manway is missing a grounding strap.

CODE REFERENCE: API 650 H.4.1.6

RECOMMENDATION: Provide grounding strap at IFR manway IAW manufacturer’s recommendations.

POL-MCX: Concur with anti-rotation cable installation.

G6CDQASM

3. RECOMMENDED REPAIRS as Part of Regular Maintenance

Recommended repairs represent items that should be addressed in a timely manner in order to prevent future potential risks to system operators, equipment integrity, or the adjacent environment.

a. DB&B Valves

OBSERVATION: Facility personnel state the DB&B valves on the main suction and receipt lines stick during the hotter months, making it difficult to open or shut the valve during normal operations.

CODE REFERENCE: Manufacturer’s Recommendations

RECOMMENDATION: Rebuild or replace two (2) DB&B valves on the main suction and receipt lines.

b. Mechanical Tape Level Gauge

OBSERVATION: Facility indicate the tape level gauge is inoperable.

CODE REFERENCE: Manufacturer’s Recommendations

RECOMMENDATION: Rebuild or replace the mechanical tape level gauge accordingly.

Staten: Replace

POL-MCX: Concur with replacement.

G6CDQASM

c. Electrical Conduit Straps

OBSERVATION: Straps and clamps for the electrical conduit is broken or loose adjacent to the receipt line.

CODE REFERENCE: BMP

RECOMMENDATION: Reattach or replace electrical conduit straps and clamps as necessary.

d. Aluminum Filler Drum

OBSERVATION: An aluminum filler drum is provided within the nozzle neck of Manway 2 to allow the

IFR to move freely past the upper manway.

RECOMMENDATION: Replace the existing aluminum filler drum with a carbon steel filler drum.

Staten: when replaced, upgrade to better metal. i.e. galvanized or aluminum, etc.

POL-MCX: Concur. Provide stainless steel conduit support clamps.

G6CDQASM

e. Manway Hardware

OBSERVATION: The shell manways and roof hatches are currently equipped with carbon steel bolts.

RECOMMENDATION: Provide stainless steel hardware at both shell manways and roof hatch.

f. AFFF Piping

OBSERVATION: The AFFF piping adjacent to the upper shell courses exhibits coating failure with widespread flaking.

CODE REFERENCE: MIL-STD-101B, 4.2.(f)

RECOMMENDATION: Recoat the AFFF piping red adjacent to the tank shell and upper shell courses.

Staten: Is the AFFF operational? If not...remove.

POL-MCX: Concur.

G6CDQASM

POL-MCX: Concur. Provide stainless steel bolts on roof IFR installation hatch as well.

g. Nameplate Stenciling

OBSERVATION: The nameplate of Tank 1 specifies the purchaser’s tank number as Tank 2.

RECOMMENDATION: Scratch out “2” under the purchaser’s tank number and stencil “1”.

h. Stainless Steel IFR Landing Pads

OBSERVATION: Stainless steel landing pads, sealed to the tank bottom, are currently provided beneath the IFR support legs.

CODE REFERENCE: BMP

RECOMMENDATION: Replace the stainless steel landing pads with Teflon plugs which should be installed in the IFR support legs.

POL-MCX: Tank 2 has similar issue. Since the information on both nameplates is identical, except for the tank numbers, it would be easier to switch the nameplates for each tank.

G6CDQASM

Sticky Note POL-MCX: Concur. Verify all IFR support legs contact the tank bottom. Adjust legs as required.

G6CDQASM

Sticky Note POL-MCX: Items missing on the report that were included in the API 653 example template:

1. Isolated shell distortion evaluation and findings.

2. Floating pan diagram showing all penetrations and attachments.

3. Seismic calculations showing the adequacy of the tank anchorage system.

D. INSPECTION INTERVALS

Intervals between tank inspections (both internal and external) should be determined by the tank service history, corrosion rates, and regulatory requirements. UFC 3-460-03 provides maximum internal inspection intervals for military installations. UFC guidelines should be used since they are more stringent. Listed below are the recommended inspection intervals:

1. Routine In-service Inspection

Facility personnel shall perform a visual inspection of the tank exterior surfaces and associated piping.

Gross defects, leaks, shell distortions, signs of settlement, and corrosion should all be monitored along with the foundation condition (including tank chime-to-foundation interface), coating, and appurtenances.

Interval: Monthly

2. External (In-Service) Inspection

An API certified inspector shall perform this inspection every five (5) years or RCA/4N years (where RCA is the difference between the measured shell thickness and the minimum required thickness and N is the shell corrosion rate) whichever is less. This inspection includes inspection requirements of the routine in-service inspection as well as a visual inspection of the tank grounding system (shunts and cables) for damage.

Interval: Five (5) years; 25 August 2021 (API)

3. Ultrasonic Thickness Inspection

An external UTT inspection of the tank shell and roof (if applicable) shall be performed by an API certified inspector every fifteen (15) years or RCA/4N, whichever is less. UT inspections may be performed in conjunction with the external inspection.

Interval: Fifteen (15) years; 25 August 2031 (API)

4. Internal (Out-of-Service) Inspection

An API certified inspector shall perform the internal inspection every 20 years or ½ remaining life of the tank bottom, whichever is less. This inspection includes a visual inspection of the tank interior surfaces and associated piping and an evaluation of the tank bottom using NDT methods. Since UFC requirements are more stringent, the internal inspection shall be performed every ten (10) years.

Interval: Ten (10) years; 25 August 2026 (UFC)

Twenty (20) years; 25 August 2036 (API)

Staten: New UFC 3-460-01 will do away with 10 year requirement.

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

IFR SUPPORT

(TYP.6)

MANWAY

ANTI-ROTATION

CABLE ATTACHMENT

TAPE LEVEL

GAUGE

RECEIPT

0'-3

0'-7"

RECEIPT PIPE

SUPPORT (TYP.2)

LOW

SUCTION

MAIN

SUCTION

PIPE

SUPPORT

(TYP.6)

CAMERON

ATG

CENTER

SUMP

WATER

DRAW

VAREC

ATG

0'-6

3'-3"

0.213"

0.187"

LEGEND:

- FOLLOW-UP ULTRASONIC THICKNESS LOCATIONS

- COATING FAILURE

- ULTRASONIC THICKNESS MEASUREMENT

- PIN HOLE

- WELD DEFECT

C O

N T

R A

C T

N

O

F I L E

A M

E

D W

N

B

Y

C K

D

B

Y

D E

S I G

N E

D

B

Y

D E

S C

R I P

T I O

N

D

2 3

C

4 5

A

B

M A

R K

A P

P R

D A

T E

F I

U M

B E

R

S I Z

E

S U

B M

I T

T E

D

B

Y

P L O

T

S

C A

L E

P

L O

T

D

A T

E

D A

T E

M A

R K

D E

S C

R I P

T I O

N

D E

L I V

E R

Y

O

R D

R

SHEET

IDENTIFICATION

D A

T E

A P

P R

SHEET OF

U S

A C

E

O

M A

H A

O M

A H

A

N

E B

R A

S K

A

H A

R T

F O

R D

C

O N

N E

C T

I C

U T

B R

A D

L E

Y

A

I

T

I O

N A

L

G

A U

R D

T A

K

F

A C

I L I T

Y

S

F I L

E

N

A M

E

M

U

S A

C E

O m a h a

D i s t r i c t

S n k

I n s p e c t i o n s

C l e n d s p e c t

F

Y

I N

S P

E C

S

I T

E

D

A T

A B r a d l e y

F i e l

G

C

A D

T a n k d w g

P

O

T T

E D

T h u r s d a y

S e p t e m b e r

W

F

D

F I L

E

N

A M

E

M

U

S A

C E

O m a s t r i c t n k

I n s p e c t i o n s

C l e s p e c t

F

Y

I N

S P

E C

S

I T

E

D

A T

A B r a d l e y

F i e

G

C

A D

T a n k d

O

T T

E D

T h u r s d a y

S e p t e m b e r

A N

S I

B r k w a y

L a n e

S u i t e

N o r c r o s s

G

A

P h o n e

F a x

J O

B

N

O

B A

H

B A

H

D A

W

US Army Corps of Engineers

TANK INFORMATION

TANK NO. (FACILITY NO.): 1 (10417)

MANUFACTURER: WITHERUP FAB. AND ERE.

YEAR BUILT: 1993

TANK DIAMETER: 32'-9"

TANK HEIGHT: 20'-9"

NOMINAL CAPACITY: 2,500 BBLS

PRODUCT: JET-A (F-24)

PRODUCT SPECIFIC GRAVITY: 0.85

GPS COORDINATES: N 41° 55' 56.07"

W 72° 42' 16.03"

B O

T T

M

Y O

U T

A-1

0.XXX"

NOTES:

1. REFER TO TABLE 1, "TANK BOTTOM ULTRASONIC THICKNESS

READINGS" IN APPENDIX A FOR THE INDIVIDUAL BOTTOM

PLATE UTT READINGS.

2. REFER TO TABLE 7, "NOZZLES AND APPURTENANCES" IN

APPENDIX A FOR NOZZLE DATA.

Table 1 – Tank Bottom Ultrasonic Thickness Readings

PLATE 1 PLATE 2 PLATE 3 PLATE 4 PLATE 5

.255 .259 .246 .245 .249 .245 .251 .249 .248 .244

.250 .250 .250 .251 .251

.253 .251 .247 .245 .247 .246 .244 .246 .252 .247

AVG. .254 .247 .247 .248 .248

PLATE 6 PLATE 7 PLATE 8 PLATE 9 PLATE 10

.252 .249 .250 .249 .250 .249 .243 .242 .252 .251

.250 .246 .250 .246 .252

.245 .244 .250 .253 .253 .245 .241 .244 .250 .250

AVG. .248 .250 .249 .243 .251

PLATE 11 PLATE 12 PLATE 13 PLATE 14 PLATE 15

.250 .250 .255 .248 .251 .248 .250 .245 .254 .252

.255 .253 .249 .250 .250

.250 .246 .249 .248 .246 .241 .248 .245 .251 .247

AVG. .250 .251 .247 .248 .251

PLATE 16 PLATE 17 PLATE 18

.254 .254 .245 .247 .263 .263

.255 .244 .263

.254 .252 .244 .244 .263 .263

AVG. .254 .245 .263

Thickness readings are in inches.

Average tank bottom plate thickness reading: 0.250”

Refer to Drawing A-1, Bottom Layout, for the plate layout.

Table 2 – Tank Bottom Critical Zone Ultrasonic Thickness Readings

0' 3' 6' 9' 12' 15' 18' 21' 24' 27' 30' 33' 36' 39' 42'

.258 .256 .258 .250 .251 .245 .245 .248 .256 .247 .255 .250 .257 .252 .253

45' 48' 51' 54' 57' 60' 63' 66' 69' 72' 75' 78' 81' 84' 87'

.249 .251 .253 .248 .248 .256 .256 .253 .255 .244 .255 .249 .252 .247 .252

90' 93' 96' 99'

AVG. 0.252

.248 .254 .252 .258

Thickness readings are in inches.

Average tank bottom critical zone plate thickness reading: 0.252”

Refer to Drawing A-1, Bottom Layout, for tank bottom layout.

0’ = directly below manway opening.

Thickness readings were taken approximately 2” from the shell-to-bottom weld proceeding clockwise around the tank from Manway 1.

Tank Bottom Service Life Evaluation

Liner

CP

Protection

50 mil

Liner

RPB

Shell tmin

(in.)

Shell tnom (in.)

D (ft.)

HL

(ft.)

Yes Yes No Yes 0.100 0.250 32.800 17.000

MRT = (Minimum of RTbc or RTip) – Or(StPr + UPr)

Where:

CP = Cathodic Protection MRT = Minimum remaining thickness, in inches, at the end of interval Or. This value must meet the requirements of API 653 Table 4-1 and sections 2.4.7.4 and 2.4.8.

RPB = Release prevention barrier includes double bottoms, synthetic materials, clay liners, or concrete pads placed in the bottom of or under a tank. RPB’s have the function of containment and detection of releases from tank bottom.

Or = In-service interval of operation (years to next internal inspection) not to exceed that allowed by API 653, 4.4.2.

RTbc = Minimum remaining thickness, in inches, from bottom side corrosion after repairs.

RTip = Minimum remaining thickness, in inches, from internal corrosion after repairs.

StPr = Maximum rate of corrosion, in inches per year, not repaired on the top side. StPr = 0 for coated areas of the bottom. The expected life of the floor must equal or exceed Or to use StPr = 0.

tmin = Minimum allowable thickness, in inches, in accordance with requirements of API 653 Table 4.4 and sections

2.4.7.4 and 2.4.8.

tnom = Thickness from previous inspection or original drawings, in inches.

to = Bottom plate original thickness, in inches.

UPr = Maximum rate of corrosion on the bottom side. To calculate the corrosion rate, use the minimum remaining thickness after repairs. UPr = 0 for areas that have effective cathodic protection.

D = Nominal diameter of tank, in feet.

HL =Height, in feet, from the bottom of the 1st shell course to the maximum allowable fill height.

S = Allowable stresses identified in Table 4.1 in API 653.

Age to RTbc RTip UPr StPr Or MRT tmin Results

23 0.250 0.186 0.186 0.00000 0.00000 20 0.186 0.050

ACCEPTABLE

Table 3 – Center Sump Thickness Data

Sump Walls Sump Dome

.381 .393

.387 .379 .396 .360 .380

.384 .384

AVG. .383 .383

All thickness readings are in inches.

API 653 Appendix B Settlement Evaluation

(ft.)

H (ft.)

Roof Type L

(ft.)

1st Course

Plate Spec

Y (psi)

E (psi)

32.800 20.8 F 12.88 A 36 36,000 29,000,000

Smax = ((L2 * Y * 11) / 2 * (E * H)) = 0.054

R2 = (Syy – SSE) / Syy = 0.929

Where:

Syy = Sum of the squares of the differences between average measured elevation and the measured elevations, in feet.

SSE = Sum of the square of the differences between the measured and predicted elevations, in feet.

D = Tank diameter, in feet.

H = Tank height, in feet.

Roof Type: F = fixed, O = Open L = Arc length between measurement points, in feet (32' max) (greatest distance allowed based on even # of points).

Y = Yield strength of 1st shell course, in pounds per square inch.

E = Young's modulus, in pounds per square inch.

Θ = Angle theta at elevation point, in degrees.

PE = Predicted elevation, in feet.

Ui = Measured out-of-plane settlement in relation to a cosine curve, in feet.

Si = Deflection, in feet (out-of-plane distortion).

Smax = Maximum allowed deflection, in feet (out-of-plane distortion).

Point Elevation

(ft.)

Θ

(degrees)

PE

(ft.)

Ui

(ft.)

Si

(ft.)

Results

1 0.458 0 0.461 -0.003 -0.003 PASS

2 0.468 45 0.468 0.000 0.000 PASS

3 0.479 90 0.476 0.003 0.003 PASS

4 0.479 135 0.479 0.000 -0.003 PASS

5 0.479 180 0.476 0.003 0.008 PASS

6 0.458 225 0.468 -0.010 -0.015 PASS

7 0.468 270 0.461 0.007 0.012 PASS

8 0.458 315 0.458 0.000 -0.002 PASS

Base

Elev

Max

Elev Δ Elev

FT 0.458 0.479 0.021 R^2 = 0.929

IN 5.496 5.748 0.252

Table 4 – Tank Bottom Elevation Measurements

Point Shell 3’-0” 6’-0” 9’-0” 12’-0” Center

1 5.500” 7.250” 9.750” 10.000” 13.250” 15.375”

2 5.675” 7.500” 8.750” 10.000” 13.250” 15.250”

3 5.750” 7.500” 7.750” 9.250” 12.500” 15.250”

4 5.750” 8.000” 9.375” 11.500” 13.375” 15.250”

5 5.750” 8.000” 9.500” 11.500” 13.750” 15.250”

6 5.500” 7.250” 9.500” 10.675” 13.500” 15.000”

7 5.675” 7.500” 10.000” 11.675” 13.875” 15.500”

8 5.500” 8.250” 10.375” 11.500” 14.250” 15.675”

Point 1 is located at Manway 1 and subsequent points are measured clockwise circumferentially every 17.8 feet.

Elevation measurements were taken every 3 feet inwards from the shell at each point.

PERIMETER

HANDRAIL

TANK

FOUNDATION

6'-11"

MW1

1-3

MW2

N14

1-1 1-4

N4

NAMEPLATE

1-5

N2

N1

N3

N5

N6

N10

N11

N12

N13

SHAND & JURS

TAPE LEVEL

GAUGE

N7

N8

N9

CAMERON

ATG

CONDUIT

ANCHOR

CHAIR

(TYP.8)

GROUNDING

CABLE

(TYP.4)

1-2

2-1 2-2 2-3 2-4

3-1 3-2 3-3 3-4

6'-11"

6'-11"

LEGEND:

- SURFACE CORROSION

NOTES:

1. REFER TO TABLE 5, "SHELL PLATE ULTRASONIC THICKNESS

READINGS" IN APPENDIX A FOR THE INDIVIDUAL SHELL PLATE

UTT READINGS.

2. REFER TO TABLE 7, "NOZZLES AND APPURTENANCES" IN

APPENDIX A FOR NOZZLE DATA.

C O

N T

R A

F I

M

E

D W

N

B

Y

C K

D

B

Y

D E

S I G

N E

D

B

Y

D E

S C

R I P

T I O

N

D

2 3

C

4 5

A

B

M A

R K

A P

P R

D A

T E

F I

M

B E

R

S I Z

E

S U

B M

I T

T E

D

B

Y

P L O

T

S

C A

L E

P

L O

T

D

A T

E

D A

T E

M A

R K

D E

S C

R I P

T I O

N

D E

L I V

E R

Y

O

R D

SHEET

IDENTIFICATION

D A

T E

A P

P R

SHEET OF

U S

A C

E

O

M A

H A

O M

A H

A

N

E B

R A

S K

A

H A

R T

F O

R D

C

O N

N E

C T

I C

U T

B R

A D

L E

Y

A

T

I O

N A

L

G

A U

R D

T A

F

A C

I L I T

Y

S

F I L

E

N

A M

E

M

U

S A

C E

O m a s t r i c t n k

I n s p e c t i o n s

C l e s p e c t

F

Y

I N

S P

E C

S

I T

E

D

A T

A B r a d l…