Attachment J.3 Fac 669 OOS Insp Report '14.pdf

API 653 OUT OF SERVICE INSPECTION REPORT

For

ABOVEGROUND STORAGE TANK 3

Facility 669

Creech AFB. Indian Springs, Nevada

Prepared for:

United States Army Corps of Engineers (USACE) Omaha District

Contract No. W9128F‐10‐D‐0072, Task Order No. 0004

Prepared by:

Weston Solutions, Inc.

1435 Garrison Street

Suite 100

Lakewood, CO 80215

July 2014

TABLE OF CONTENTS

SECTION 1 SUITABILITY FOR SERVICE STATEMENT .......................................... 1-1

SECTION 2 SUMMARY OF RECOMMENDATIONS ................................................. 2-1

2.1 Mandatory ................................................................................................ 2-1

2.2 Near Term ................................................................................................ 2-1

2.3 Long Term ............................................................................................... 2-4

2.4 Monitoring Recommendations................................................................. 2-5

APPENDIX A Tank Inspection Report Powers Engineering & Inspection, Inc.

CREECH – TANK 3

CREECH AIR FORCE BASE, INDIAN SPRINGS, NEVADA - TANK NO. 3 Page - 1-1

SECTION 1 SUITABILITY FOR SERVICE STATEMENT

This aboveground storage tank (AST) was inspected on 25 June 2014. An American Petroleum Institute API 653 Out-of-Service inspection was performed by Powers Engineering & Inspection, Inc., for Weston Solutions, Inc. (WESTON®) under contract to the United States Army Corps of Engineers (USACE) Omaha District.

Mandatory Repairs

Repairs are required for continued service. Significant volumes of product were observed on the top of the internal floating roof and internal floating roof seal has been compromised. A pin-hole in weld exists at the shell horizontal weld and shell vertical ladder support intersection. The double wiper seals have become brittle and sections have broken away. One soil-side indication of less than 0.200-inch wall thickness requires repair to extend the next bottom side inspection to 20 years.

Other Repairs and Maintenance

Near-Term and Long-Term maintenance and repair items have been identified by this inspection.

Completion of these items is recommended to assure successful long term service. Detailed recommendations are included in Section 2 of this summary.

Inspection Intervals

The following are the maximum inspection intervals allowed per API 653 for this storage tank based on corrosion rate considerations. The owner may elect to inspect more frequently. United Facilities Criteria (UFC) 3-460-03 requires an API 653 out-of-service internal inspection of the tank be conducted every 10 years.

Inspection Type Interval Complete no later than:

API In-Service (external) 5 years June 2019 UFC Out-of-Service (internal) API Out-of-Service (internal)

10 years 20 years

June 2024 June 2034

This storage tank inspection and suitability for service evaluation have been completed in accordance with the requirements of API Standard 653, Fourth Edition, Addendum 2, January 2012.

CREECH – TANK 3

CREECH AIR FORCE BASE, INDIAN SPRINGS, NEVADA - TANK NO. 3 Page - 2-1

SECTION 2 SUMMARY OF RECOMMENDATIONS

2.1 Mandatory

Mandatory items are repairs or other actions necessary to preserve or restore the structural or hydraulic integrity of the tank, or to comply with applicable codes, standards and regulations.

1. Significant volumes of product were observed on the top of the internal floating roof.

Recommendation: Identify the source of product seepage and repair.

2. The floating roof primary double wiper seals are cracked, seals show isolated areas of failure, contain missing seal sections and product was observed on top of the internal floating roof.

Recommendation: Replace the double wiper seals with new wiper material. Implementation of this recommendation is consistent with UFC 3-460-01 guidance and Defense Logistics Agency (DLA)-Energy policy.

3. A pin-hole exists at the intersection of a shell horizontal weld and vertical ladder support reinforcing pad.

Recommendation: Repair existing pin-hole by welding and perform weld examination in accordance with API 653, Section 12.2.1.3.

4. One soil-side corroded area on bottom of plate depicted in Section 3 has remaining thickness of 0.190-inches.

Recommendation: Implement repair by installing 16-inch x 12-inch seal welded lap plate in accordance with API 653 Section 9.10, and perform weld examination in accordance with API 650, Sections 7.3.3 and 8.5.

2.2 Near Term

Near-Term Recommendations are repairs and upgrades based on good engineering and maintenance practices or compliance with policy or criteria.

1. The left side reinforcing plate for the 24-inch manway does not contain a tell-tale hole.

Recommendation: Drill and tap tell-tale hole in accordance with API 650 Section 5.7.5.1, API 653 Para. 9.7.2, and perform pneumatic pressure on test hole by applying 15 pounds per square inch (psi) in accordance with API 650 Section 7.3.4.

2. A 2-inch threaded plug exists near the 36-inch manway.

Recommendation: Remove 2-inch diameter threaded shell nozzle and install lap-welded shell plate in accordance with API 653 Section 9.3. Repair shall be examined visually and by magnetic particle method as prescribed by API 653 Section 12.1.8.2.

Recommendations

CREECH AIR FORCE BASE, INDIAN SPRINGS, NEVADA - TANK NO. 3 Page - 2-2

3. The reinforcing plate for the 4-inch receipt nozzle overlaps a vertical shell weld and is not in accordance with API 650 Section 5.7.3 and API 650, Figure 5-6.

Recommendation: Provide magnetic particle testing of welds in accordance with API 653, Section 4.3.9.1.

4. The 24-inch manway located on the northeast corner of the tank pad is not equipped with a davit arm assembly to assist with safe-opening and closing.

Recommendation: Install a davit support arm assembly in accordance with API 653 Section

5.8.3.5 and Department of Defense (DOD) Standard (STD) Design AW 78-24-27 Drawing Sheet D.10/Detail C4.

5. Product was observed trapped beneath the five floating roof leg bottom striker plates.

Recommendation: Remove existing striker plates and install Teflon plugs on the bottom of each floating roof leg.

6. External rubber boot on 4-inch roof stilling well roof penetration has failed.

Recommendation: Replace the rubber boot seal before resuming tank service.

7. Vertical ladder support reinforcing plates have been installed over a horizontal shell weld.

Recommendation: Conduct magnetic particle testing of welds in accordance with API 653, Section 4.3.9.1.

8. Internal floating roof penetration seals for 4-inch and 6-inch diameter stilling wells and anti-rotation cables are worn and/or damaged.

Recommendation: Replace the internal floating roof penetration seals before returning the tank to service.

9. Metal to metal contact exists on the interior 4-inch internal, 6-inch issue, and 3-inch x 1-inch water draw-off piping and support system.

Recommendation: Replace supports with coated U-bolts and install neoprene pads between each pipe bottom and pipe support system in accordance with AW 78-24-27 Drawing Sheet D.08/ Detail A4.

10. The tank is equipped with a Cameron tank radar mounted inside the 4-inch stilling well. The radar does not interface with the hydraulic Cla-val operation (high-liquid level shut-off valve [HLV]).

Recommendation: Repair or replace the existing Cameron tank radar before returning the tank to service.

11. Isolated voids exist between the bottom to shell protrusion (chime) to foundation.

Recommendation: The shell to foundation must be cleaned and backer-rod install shall be installed in missing areas and sealed with fuel resistant caulk to prevent water migration under the tank.

CREECH AIR FORCE BASE, INDIAN SPRINGS, NEVADA - TANK NO. 3 Page - 2-3

12. Sealant has failed at the secondary containment liner and concrete tank pad foundation.

Recommendation: Remove deteriorated/degraded sealant from between the secondary containment liner and concrete pad. Clean concrete panel seams and seal with fuel resistant caulking to prevent water and product migration from containment area.

13. Tank is not equipped with an access platform at the high and high-high level control elevation.

Recommendation: Provide an access platform in accordance with Occupational Safety and Health Administration (OSHA) Section 1926.1051.

14. Tank is equipped with one 4-inch diameter ATG stilling well and one 8-inch diameter manual gauge slotted stilling well. The existing 4-inch and 8-inch stilling wells are not designed to allow horizontal movement in a seismic event.

Recommendation: Remove the existing 4-inch ATG stilling well and provide a new 8-inch diameter stilling well for ATG servo gauge in accordance with DOD STD AW 78-24-27 Drawing Sheet No. D.07, Detail A1. Provide a new 8-inch diameter roof nozzle to allow for the installation of a 6-inch diameter stilling well for an ATG water/temperature probe in accordance with AW 78-24-27 Drawing Sheet No. D.07, Detail C4. Modify 8-inch manual stilling well bottom attachment in accordance with AW 78-24-27 Drawing Sheet D.07/Detail C3.

15. The 2-foot x 2-foot floating roof access hatch gasket was reported to have failed.

Recommendation: Replace the floating roof access gasket.

16. The existing high and high-high level controls are equipped with threaded connections that do not comply with AW 78-24-27 Drawing Sheet No. D.12, Details C1 and C3.

Recommendation: Update the existing high and high-high level controls with an additional sensor chamber and piping configuration to comply with DOD STD AW 78-24-27 Drawing Sheet D.12/Detail C3.

17. The existing 4” receipt header is aluminum and not typical carbon steel. A portion of this header was modified to carbon steel (CS) at repair locations adjacent to Tank 1 while repairs were completed on that tank. As a result of those repairs, the header transitions from CS to aluminum up-stream of tank 1 and runs past the branch-tee servicing Tank 2 and terminates at a flange associated with Tank 3. The aluminum line appears to be warped and is improperly supported along its length.

Recommendation: Replace the existing 4” aluminum receipt header piping with 4” diameter carbon steel piping (American Society for Testing and Materials (ASTM) A53 Grade B Seamless), and eliminate the branch-tee that serviced Tank 2 since Tank 2 will not be placed back in service in its current location.

18. Fuel facility users currently do not have a hardline sealed piping system that allows safe transfer of product between tanks. A design was suggested that will take advantage of piping currently in place that will provide this ability with a minimum of modification cost.

Recommendation: Consider installing a hardline transfer tank system.

CREECH AIR FORCE BASE, INDIAN SPRINGS, NEVADA - TANK NO. 3 Page - 2-4

19. Tank is not equipped with low and low-low level alarms and controls.

Recommendation: Install low and low-low level controls in accordance with DOD STD Design AW 78-24-27 Drawing Sheet No. D.12/Detail A3 and Detail C1.

20. The 3-inch shell nozzle water draw-off is equipped with a 1-1/2 inch freeze valve and threaded piping connections to the product saver tank (PST). The PST is not equipped with a product return pipe, electric pump, 2-inch Double Block and Bleed (DBB) valves or 2-inch product return nozzle.

Recommendation: Install one 2-inch diameter shell nozzle to provide a product return piping conveyance. In addition, install one 2-inch and 3-inch diameter DBB valve, and provide eccentric reducing fittings to receive 1-inch diameter piping required for influent and effluent piping conveyances between the shell and PST. All fittings, materials, and welded connections shall be compliant with DOD STD Design AW 78-24-27 Drawing Sheet D.13/Detail A1.

21. Minor coating failure was observed on the external cone roof, vertical ladder handrails, and upper platform.

Recommendation: Provide maintenance recoating on failed surface areas.

22. Tank is not equipped with a mechanical tape level float gauge.

Recommendation: Install a mechanical tape level float gauge in accordance with DOD STD Design AW 78-24-27 Drawing D.07, Detail C1.

23. Tank is not equipped with an overflow vent or circulation vents.

Recommendation: Install overflow vent/circulation vents in accordance with DOD STD Design AW 78-24-27 Drawing Sheet No. D.07, Section A4.

24. Tank is not equipped with scaffold cable supports.

Recommendation: Install two scaffold cable supports in accordance with DOD STD Design AW 78-24-27 Drawing Sheet No. 30.02.

25. As found conditions showed that no API 650 nameplate was mounted on the tank shell.

Recommendation: Provide one API 650 nameplate in accordance with API 653 Section 13 attached to the tank shell. Additionally, the tank name plate shall meet the requirements of DOD STD Design Sheet No. D.10/Detail C3.

2.3 Long Term

Long term repairs and upgrades are intended to extend the service life of the tank, ensure continued compliance with codes, standards and regulations, and discretionary improvements.

1. The tank bottom does not have leak detection provisions.

Recommendation: If the tank bottom is replaced, consider including this feature in the bottom replacement design.

CREECH AIR FORCE BASE, INDIAN SPRINGS, NEVADA - TANK NO. 3 Page - 2-5

2. The existing shell access manways (one 24-in. manway and one 36-inch) do not meet current UFC standards of two 36-in. grade access manways.

Recommendation: Installation of the proper sized and designed manways may be considered when the tank is out of service for scheduled inspection, maintenance, repairs or upgrades.

2.4 Monitoring Recommendations

Additional recommendations for monitoring tank condition to ensure continued reliable service.

1. Continue providing API 653 inspection at required intervals.

Recommendation: Conduct inspections in accordance with API 653 and DLA-Energy policy.

2. The 6-inch issue nozzle has a slight inward distortion.

Recommendation: Monitor nozzle location for any change in condition during monthly inspections.

3. Electrical conduits, uni-struts, and grounding are attached by weldment directly to the external shell without the use of reinforcing pads.

Recommendation: Monitor each location for any change during monthly inspections.

4. The 4-inch diameter receipt, 3-inch water draw-off, and 24-inch manway shell flanged nozzles have neck thicknesses that do not comply with API 650 Table 5-6b requirements. Additionally, the 6-inch issue nozzle and 36-inch shell manway have minimum distances from bottom of tank to centerline of nozzles that do not comply with API 650 Table 5-6b requirements. The 24-inch shell manway has a neck length that does not meet Table 5-6b requirements.

Recommendation: Monitor flanged nozzles during future inspections.

Appendix A

API 653 Tank Inspection Report Powers Engineering & Inspection, Inc.

API 653

Inspection Report

Out-Of-Service or Internal Inspection w/ External Checklist

Report Prepared For

WESTON SOLUTIONS

CREECH AFB

Indian Springs, Nevada

JP-8

Tank Number

Inspected on

June 25, 2014

Report Prepared By

PPPOOOWWWEEERRRSSS

ENGINEERING & INSPECTION, INC.

PO BOX 1928

BENICIA, CA 94510

TEL 707 334 3400

FAX 707 922 2284

WWW.POWERSEI.COM

Gary Powers, P.E.

Authorized Inspector 0691

ASNT Level II UT, PT, MT and VT API 653 Appendix G MFL Certified

California Civil Engineer 60589

Inspection History Constructed New Bottom Annular Plates External Inspection Internal Inspection Shell UT Inspection

1979 - - 6/25/2014 6/25/2014 6/25/2014

Next Inspection: 2019 2034 2029

Revisions

Rev. 1 7/28/14 Comments 7/17/14 email Rev. 2 7/28/14 Comments 7/25/14 email

BENICIA, CA 94510

API 653 INTERNAL INSPECTION

INDIAN SPRINGS, NV

ENGINEERING & INSPECTION, INC www.powersei.com Tank 3

API653 Internal Creech AFB Tk 3 Rev 1 © 2014 PE&I Inc.

Page 2 of 17 Date Printed: 7/28/14 11:14 AM

EXECUTIVE SUMMARY

Powers Engineering and Inspection, Inc. was contracted by Weston Solutions to provide an API 653 Inspection for Tank 3 at the Creech Air Base in Indian Springs, NV.

The 18-ft dia. x 16-ft high was constructed in 1979 with a 0.250-in lap-welded bottom by Brown Tank and Steel. At the time of the inspection the tank was equipped with an external rafter, steel cone roof and an aluminum honeycomb floating roof. The tank was previously in JP-8 service and will be in Jet-A service after this out-of-service period.

The report and executive summary are based on field inspection and evaluation in accordance with the API 653 Standard. Before the tank is returned to service all the requirements of API 650 and 653 should be met.

Inspection Methods

Employed Results

1 Identify any current leak paths resulting from corrosion, internal or external.

API 653

Appendix G MFL (Magnetic Flux Leakage) bottom corrosion survey.

100% Visual Inspection (VT) of shell, annular plate, corner weld and all bottom welds for defects cracks or corrosion Digital Camera Documentation.

1.1 The 0.250-in bottom was inspected for soil side corrosion utilizing the MFE 2412 Mark II scanner.

1.2 Isolated areas of magnetic flux leakage were detected during the floor scan and were proved up with a UT scrub. All of these indications were from grinded down weld tear-outs with the exception of two areas of soil-side corrosion with a remaining thickness of 0.210-in and 0.190-in (see Bottom Layout Drawing). Next Inspection calculations have determined that if this corrosion is left unaddressed during this out-of-service period, these areas will not have corroded to 0.05-in or less. No corrective action is required.

1.3 100% visual inspection of the bottom was performed. No product-side pitting or weld defects were identified.

1.4 All areas inaccessible to the scanner were 100% UT scrubbed. No indication of soil-side corrosion was located.

1.5 The period-to-next formal API 653 Internal Inspection, utilizing the MRT method described in API 653 4th Edition may be extended to a maximum of 20 years per corrosion rate calculations if the bottom repairs are performed.

However, more stringent governing regulatory intervals of inspection may supersede this interval.

2 Identify any risk areas for future leak path development

Utilize Ultrasonic Testing (UT) to find areas of potential thinning or corrosion loss from internal corrosion.

Documentation of any brittle fracture concerns including nozzle weld spacing.

2.1 The external bottom extension-to-foundation caulking has several areas that have deteriorated. Consider replacing 100% of the bottom extension caulking.

2.2 A 2-in threaded plug is present beside the 36-in manway. If the component is no longer in use, remove the threaded plug and install a welded plug.

2.3 The sump was UT scanned along equally spaced sections along the circumference with an average wall thickness of 0.400-in.

2.4 The left-hand repad along the 24-in shell manway was installed without a tell-tale hole. Consider drilling a tell-tale hole in the repad.

2.5 The conduits along the tank shell are supported by uni-struts welded directly to the tank without the use of repads. No indication of preferred corrosion or other signs of a brittle fracture risk were identified. No corrective action is recommended.

2.6 The 4-in inlet nozzle has a non API 653 compliant thickened insert that was installed over a shell vertical weld. A slight inward distortion of the shell is present. Since the tank has been in operation at full fill height of 11-ft without an issue, no corrective action is required. Monitor this area for change.

2.7 The shell near the 6-in suction nozzle has a slight inward distortion. No signs of added stress were identified along adjacent shell and nozzle welds.

No corrective action is recommended. Monitor the condition for any change.

2.8 A pinhole is present on a shell horizontal weld at the intersection with a ladder support repad. Since the tank has been in service since 1979 with this condition at it’s full operating height, no corrective action is recommended.

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Inspection Methods Employed

Results

Monitor the condition for any signs of change.

2.9 The rubber boot on the 4-in gauge pole on the cone roof is cracked and deteriorated. The component is going to be replaced during this out-of-service period.

2.10 Product is trapped under the striker plates for the floating roof legs along the bottom of the tank. Product is also present above some of the striker plates on the underside of the floating roof. The striker plates should be replaced with seal-welded repads or install Teflon tips on the bottom of the floating roof legs.

2.11 Metal to metal contact is possible between the internal piping components and their supports. Install U-bolts and Teflon pads between the piping and supports.

3 Settlement Survey of the shell base for settlement.

Survey of the bottom for settlement.

3.1 The maximum out-of-plane settlement was approximately 1.75-in, which is within acceptable limits of API 653 Appendix B calculations for differential settlement. See survey results. The original revision of this report had data points that did not fit well to the model curve. The results passed after shifting the actual data points on the x-axis to better fit the model planar settlement curve.

3.2 No significant edge settlement was identified.

3.3 The bottom is cone-down by approximately 2-in.

3.4 The seismic loads were calculated utilizing the latest API 650 Appendix E (ASCE 7/ IBC 2009 methods). The risk of damage from a seismic event is minimal for all fill heights.

4 Venting VT of existing roof vents

4.1 The tank is equipped with 2: 12x24-in open roof vents.

4.2 The cone roof is also vented with a 6-in PV vent and an 8-in open vent.

5 Access Structure

VT of existing access structure.

5.1 The handrails and upper platform have only minor coating failure.

5.2 The caged vertical safety ladder supports are attached to the shell with 6-in diameter seal-welded repads.

6 Cone Roof VT of existing roof

6.1 The tank is equipped with a steel cone roof with external rafters and appears to be in good condition.

6.2 The coating along the cone roof is in overall good condition with only minor, isolated areas of cracking type failure.

6.3 The dimensions of the access hatch mounted on the cone roof could not be measured due to lack of access.

7 Floating Roof VT of existing floating roof

7.1 The tank is equipped with an aluminum honeycomb floating roof with a rubber, double wiper seal.

7.2 The floating roof primary seals are cracked throughout and have completely failed in isolated places. Replace 100% of the floating roof seals.

7.3 During time of inspection, the floating roof legs were set at approximately 63-in. Measurements indicate that on low-legs, the floating roof will be at 26-in height.

7.4 The gaskets long the gauge pole penetrations and along the 2x2-ft access hatch are worn or have completely failed. Replace all gaskets.

7.5 The rim space varies from 4.25-in to 6.5-in.

7.6 Product is present on the top of the floating roof deck (see Floating Roof drawing). Verify that the tank is free from product before performing any hot work.

8 Tank gauging overfill protection

VT of existing systems Is a Clay valve present?

If the preferred gauging system present?

8.1 The 8-in and 4-in gauge poles are slotted along their entire height. Both gauge poles are equipped with seismic sleeves and seal-welded repads which allow vertical movement but restrain horizontal movement.

8.2 The tank is equipped with a Cameron tank radar which is mounted inside the 4-in slotted stilling well and does not appear to communicate with the Claval.

8.3 The Hi-Hi alarm is located at 26-in from the top of the shell and the Hi-alarm is located 60-in below the top of the shell. Both components are connected to a Claval.

8.4 Low and low-low alarms were not present.

8.5 The tank is not equipped with a mechanical level-float system.

BENICIA, CA 94510

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Inspection Methods Employed

Results

8.6 The Hi-Hi alarm, as well as related pipe nipples and brackets, have threaded components which should be replaced with welded components.

8.7 A product recovery system was not observed near the tank. It is recommended that the presence and location of a product recovery system for this tank be verified.

9 Dike VT of the existing Dike

9.1 The tank is surrounded by an earthen dike with a liner installed throughout the dike area. Both the concrete pad and liner appear to be in good condition.

BENICIA, CA 94510

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ACTION OR CRITICAL ITEMS

REQUIRED REPAIRS PRIOR TO RETURN TO SERVICE (MANDATORY)

Listed below are the critical findings noted during the inspection that would prevent Tank 3 from returning to service:

1. (finding) Significant product was present on the top of the floating roof deck, along isolated floating roof panel seems, and under the floating roof leg striker pads. (required action) Verify that the tank is free from product before performing any hot work.

2. (finding) The rubberized components of the floating roof seal are dried and cracked and are no longer providing a reliable seal. In several areas, the seal is missing a section.

(required action) Install 100% new seals along the floating roof.

3. (finding) Product has accumulated on top of the floating roof deck (see Floating Roof Drawing).

(required action) Locate the source of the seep and repair.

CONSIDERATIONS OR RECOMMENDED REPAIRS

RECOMMENDED REPAIRS PRIOR TO RETURN FOR SERVICE (NON-MANDATORY/NEAR

FUTURE)

The following are deficiencies identified during this inspection that the Inspector feels are mandatory items and should be addressed as soon as possible to insure continued safe operation of Tank 3:

4. (finding) MFL indications were proved-up with UT and a remaining thickness of 0.190-in was located. (recommendation) Install a 16x12-in seal-welded lap patch over the marked area on the bottom plate (see Bottom Lay-Out Drawing).

5. (finding) Product is trapped under the striker plates for the floating roof legs along the bottom of the tank. Product is also present above some of the striker plates on the underside of the floating roof.

(recommendation) Replace the striker plates with seal-welded repads or install Teflon tips on the bottom of the floating roof legs.

6. (finding) Metal to metal contact is possible between the internal piping components and their supports. (recommendation) Install U-bolts and Teflon pads between the piping and supports.

7. (finding) The left-hand repad on the 24-in shell manway was installed without a tell-tale hole.

(recommendation) Install a tell-tale hole in the repad.

8. (finding) A 2-in threaded plug is present beside the 36-in manway (see Shell Roll-Out).

(recommendation) Replace with a welded plug.

9. (finding) The caulking along the foundation to bottom extension contact is in good shape with the exception of some isolated voids. (recommendation) Apply touch-up caulking to areas of the bottom-to-foundation caulking with voids.

10. (finding) The gaskets along the floating roof penetrations are worn or highly damaged.

(recommendation) Replace all gaskets along the floating roof penetrations.

BENICIA, CA 94510

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11. (finding) No shell vent/overflows are present. Although a rim vent is present along the top angle, military guidelines may prefer shell vents. (recommendation) Install shell vents/overflows.

12. (finding) The tank is equipped with one 24-in manway and one 36-in manway. UFC requires two 36-in manways. (recommendation) Install two 36-in manways at ground level.

NON-MANDATORY ITEMS

13. (finding) No API 650 nameplate is present on the tank shell although one is located on the roof manway (recommendation) Install a properly mounted API650 nameplate above the 36-in manway.

14. (finding) A non API thickened insert was installed with poor weld spacing at an unknown time along the 4-in inlet nozzle. Presumably during installation of the insert, a slight inward distortion of the shell occurred. (recommendation) No corrective action is required because these items have been in service for some time, an indication that the brittle fracture risk is low.

15. (finding) A slight inward distortion of the shell is present around the 6-in suction nozzle.

(recommendation) No corrective action is required because these items have been in service for some time, an indication that the brittle fracture risk is low.

16. (finding) A pinhole was located at the intersection between a shell horizontal weld and the ladder support repad. (recommendation) Continue to monitor the condition for any signs of change.

BENICIA, CA 94510

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Table of Contents

Executive Summary Action or Critical Items

Required Repairs Prior to Return to Service (Mandatory) Considerations or Recommended Repairs

Recommended Repairs Prior to Return for Service (Non-Mandatory/Near Future) Non-Mandatory Items

Basic Tank Information Shell Settlement Survey Shell Thickness Calculation Shell Roll-Out Cone Roof Bottom Lay-out Floating Roof Layout (from underside) Next Inspection Seismic API 2000 Venting Calculations

Appendix A API 653 Checklist Appendix B Photo’s

Initial Inspection Significant Photos Initial Inspection General Photos Appendix C Non-Destructive Examination (NDE) UT Report

BENICIA, CA 94510

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BASIC TANK INFORMATION

Tank Number: Owner: Location: Unit/Zone/Area:

US AIR FORCE

INDIAN SPRINGS

CREECH, AFB

LIQUID FUELS

Product: Diameter (ft): Height (ft): Capacity (gallons):

16-FT TANK HEIGHT

11-FT FILL HEIGHT

20,937 (at Fill Height)

Type Tank:

Year Built: Design Standard: Manufacturer:

CONE ROOF TANK W/ ALUMINUM

FLOATING ROOF

API 650 7th

BROWN TANK AND STEEL

Type Roof: Type Foundation: Type Bottom:

BUTT-WELDED

STEEL CONE

CONCRETE PAD

1/4-IN LAP WELDED

Type Floating Roof: Type Primary Seal: Type Secondary Seal: Roof Drain:

ALUMINUM HONEYCOMB

RUBBER WIPER

RUBBER WIPER

1:3-IN

Roof Access: Floating Roof Access: Roof Vents: Roof Man ways:

CAGED VERTICAL

LADDER

PORTABLE LADDER

2:12X24-IN OPEN VENT

1:6-IN PV VENT

1:8-IN OPEN VENT

1:24-IN

Pumping Rate: Suction Nozzle: Inlet Nozzle: Shell Man ways:

UNKNOWN

1:6-IN

1:4-IN

1:24-IN

1:36-IN

Leak Detection: Secondary Containment: Cathodic Protection: Insulation:

DIKE WITH LINER

YES

NONE

Shell Coatings: Roof Coatings: Bottom Coating:

EXTERNAL/INTERNAL

100%

100% EPOXY

EPOXY

BENICIA, CA 94510

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SHELL SETTLEMENT SURVEY

0 14 28 42 0

Actual 0.00 1.50 1.75 0.50 0.00

Cosine 0.00 0.88 1.75 0.88 0.00

0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 2.00

S et tl em en t

(i n

Circumferential Distance (ft)

Base of Shell Elevation for 4 point Survey

The settlement for the tank is planer or roughly approximates the shape of a cosine curve.

The evaluation of this “out-of-levelness” or settlement, utilizing the criterion for “out-of-plane distortion” as described in API 653 Appendix B.3.2, indicates that the settlement is well within the acceptable limits.

Applicable Standards:

Shell settlement surveys were conducted in accordance with the requirements of API 653 Figure B-1. These surveys were evaluated in accordance with the API 653 Appendix B.2.2 and compared with the acceptance criteria outlined in API 653 Appendix B.3.2.

Note:

Calculation of maximum permissible S or out-of-plane distortion per API 653 Appendix B.3.2 was made using:

14.1 L < 32-ft OK

30,000 Y Survey Max 0.146 (ft)

29,000 E 1.75 (in)

16.0 H Curve Fit R^2 1.0000

Results: Allowable > Actual

Differential (ft) 0.071 > 0.052 Pass

(in) 0.853 > 0.625

Spacing Between (ft)

Tank Height (ft)

Modulas of Elasticity (ksi)

Allowable Stress (psi)

Curve Fit OK R^2>=90%

BENICIA, CA 94510

Page 10 of 17 Date Printed: 7/28/14 11:14 AM

SHELL THICKNESS CALCULATION

Shell Corrosion Rate Calculations API 653 6.3 © POWERS Engineering and Inspection, Inc. 2014

A B N RCA

Calculated Prev Current As Built Prev Current t min Previous Current

(yr) (yr) (yr) (in) (in) (in) (in) (in/yr) (in/yr) (in) (yr) (yr)

1 1979 2014 2014 0.188 0.188 0.185 0.100 0.00000 0.0000 0.0850 5 15 2 1979 2014 2014 0.188 0.188 0.185 0.100 0.00000 0.0000 0.0850 5 15

RCA/4N Next External

API 653 6.3.2

RCA/2N Next

UT

Inspection

API 653 6.3.3

Date(s)

Year Built or

Replaced

Inspection Year Thickness

Measured

Corrosion Rate(s)

API 653 6.3.2.1

(A-B)

C o ur se

Find: Minimum shell thickness (t min) for each shell course utilizing the API 653 standard for tanks less than 200 ft dia.

Given:

Variable Identifier Description Value Reference

H Fill height (ft) 11.00 Measured from the base of each shell course (see column H in the table below) D Tank Diameter (ft) 18.00 G Specific Gravity 0.84 S Allow stress (psi) Varies Reference API 653 Table 4-1 E Joint Efficiency Varies Reference API 653 table 4.2 for Welded and 4.3 for Riveted construction M 1.00 Temp Modifier Varies Reference API 650 Appendix M Elevated temperature modifier

H E S Actual Solution

2.6 ( H - 1) DG

SEM

(in) (ft) (ft) % (psi) (in) (in) OK?

8 3.00

Type of Joint for each Course

Joint Eff API 653 Tbl

4.2 and 4.3

Material Type or Unknown

Welded or Riveted

Solution:

Table for Calculating minimum shell thickness (t min) for each shell course

Product Height Above Course

Maximum Allowable

Stress t min = Req'd t min

API 653 Required Calculation

Actual Vs

Req'd

C o u r s e

Height of each Course

API 653 4.3.3.1

Minimum Thickness for Course

85% Butt Weld 0.85 Welded Unknown 23,600 0.1000 0.1900 Ok

1 96.00 8 11.00 85% Butt Weld 0.85 Welded Unknown 23,600 2.6 x ( 11.00 - 1 ) x 18.00 x 0.84 ( 23,600 x 0.85 x 1.00)

0.1000 0.1900 Ok

2.6 x ( 3.00 - 1 ) x 18.00 x 0.84 ( 23,600 x 0.85 x 1.00)

2 96.00

BENICIA, CA 94510

Page 11 of 17 Date Printed: 7/28/14 11:14 AM

SHELL ROLL-OUT

BENICIA, CA 94510

Page 12 of 17 Date Printed: 7/28/14 11:14 AM

CONE ROOF

EXTERNAL RAFTER

6-IN GOOSE NECK VENT

3-IN THREADED PLUG

ACCESS HATCH

3-IN THREADED BLIND

1 X 2-FT ROOF VENT

CAGED LADDER

20-IN MANWAY

4-IN RADAR UNIT

8-IN GAUGE HATCH

6-IN PV VENT

PLATFORM

8-IN OPEN VENT

6-IN GOOSE NECK VENT

4-IN LAP PATCH

3-IN THREADED PLUG

4-IN LAP PATCH

3-IN THREADED PLUG

1 X 2-FT ROOF VENT

RUBBER SHOE

DETERIORATED

4-IN LAP PATCH

BENICIA, CA 94510

Page 13 of 17 Date Printed: 7/28/14 11:14 AM

BOTTOM LAY-OUT

8-IN GAUGE

POLE

4-IN GAUGE

POLE

24X12-IN SUMP

6-IN SUCTION

ANTI-ROTATION

4-IN DIFFUSER

1-IN TO 3-IN WATER DRAW

24-IN MANWAY

36-IN

MANWAY

2.5-IN ROOF LEGS

ANTI-ROTATION

0.20 RTSS

0.19 RTSS

METAL TO METAL

CONTACT ON ALL PIPE

SUPPORTS

THREADED

PLUG

16X12-IN

LAP PATCH

PRODUCT

UNDER

PADS

(23-IN INNER DIAMETER)

BENICIA, CA 94510

Page 14 of 17 Date Printed: 7/28/14 11:14 AM

FLOATING ROOF LAYOUT (FROM UNDERSIDE)

2 X 2

HATCH

ANTI-ROTATION

4-IN GAUGE POLE

8-IN GAUGE POLE

ROOF

LEGS

ANTI-ROTATION

REPLACE SEALS

AS VIEWED FROM UNDERSIDE

REPLACE GASKETS

PRODUCT

BENICIA, CA 94510

Page 15 of 17 Date Printed: 7/28/14 11:14 AM

NEXT INSPECTION

Find: Bottom repair threshold criteria to permit return to service until the next inspection utilizing the API 653 4.4.5 MRT methodology

Given:

Variable Identifier

Minimum remaining thickness at the end of inspection interval, Or

In-service interval of operation (years to next internal Inspection) Or Not to exceed that allowed by API 653 6.4.2 Minimum remaining thickness from bottom side corrosion RTbc After repairs

Minimum remaining thickness from internal corrosion RTip After repairs Maximum rate of corrosion not repaired from internal corrosion StPr StPr = 0 for coated areas of the bottom If coating life < Or use Or

Maximum rate of corrosion not repaired on the bottom side UPr

Current Installation Age A Age of bottom (Inspection year - Installation year): 2014 1979 35 35 35

Expected Period until next inspection (years): 20 20 20

Bottom thickness Bottom CZ Annular

B Nominal thickness when bottom installed (in): 0.2500 0.2500 n/a

API 650 Required Bottom Thickness (in) API 650 Table 5-1b API 653 Required Bottom Thickness (in)

Minimum thickness (MRT) C Bottom away from CZ and Annular with Dble Bottom or Secondary Contain (in): 0.050 0.100 n/a API 653 table 4-4, 4.4.5, and 4.4.6

Bottom Coating Estimated life of coating (years) 20 20 n/a

Repair criteria D Product side corrosion repair thickness RTip (in): 0.1500 0.2000 n/a

Pit Depth to be Repaired (in) 0.1000 0.0500 n/a

E Bottom side corrosion repair thickness RTbc (in): 0.2000 0.2140 n/a

F Minimum RTbc and RTip (in): 0.1500 0.2000 n/a

StPr = (B-D)/A 0.00286 0.00143 n/a

StPr = 0 if estimated life of bottom coating > 0r 0.00000 0.00000 n/a UPr = (B-E)/A 0.00143 0.00103 n/a

G StPr + UPr 0.00143 0.00103 n/a

Rewriting the MRT equation to solve for Or or the years until next inspection

Or = (F-C)/G 70.00000 97.22222 n/a 20.00

Solution:

1a.) Repair all bottom plate pits deeper than 0.1000-in and all bottom plate soil side corrosion resulting in remaining thickness less than 0.1500-in.

1b.) Repair all bottom CZ pits deeper than 0.0500-in and all bottom CZ soil side corrosion resulting in remaining thickness less than 0.2000-in.

2.) Apply or Maintain a coating system to provide product side corosion resistance until the next inspection.

Or= ((minimum of RTbc or RTip)-MRT)/(StPr+Upr)

MRT= (minimum of RTbc or RTip)-Or(StPr + Upr)

UPr = 0 for areas of bottom with effective Cathodic Protection UPr= MFE threshold or Minimum remaining thickness from bottom side corrosion after repairs.

To extend the period until next internal or bottom inspection 20 years or until the year 2034

'Or' min or 20 years

BENICIA, CA 94510

Page 16 of 17 Date Printed: 7/28/14 11:14 AM

Seismic Design per API 650 11th Appendix E

Given:

Tank Number: Tk 3

Type Roof Tank (D)iameter (ft) 18.00

Tank (H)eight (ft) 16.00 Product fill Height (ft) 11.00 Hfill

Specific (G)ravity 0.84

Location: Latitude (deg) 36.589453 Longitude (deg) -115.679674

Spectral Response Factors Ss 0.45 45.00% USGS or UFC 3-101 -1 tbl F-2 S1 0.16 16.00% USGS or UFC 3-101 -1 tbl F-2 So 0.180 = Ss*0.4 for Mapped Methods

Site Coefficients Fa 1.440 API 650 Table E-1 OR UFC OR ASCE-7 Fv 2.16 API 650 Table E-2 OR UFC OR ASCE-7

Regional-dependant transition period TL 8 ASCE 7 maps Varies from 4 to 12 Sm1=Fv*S1 0.3456

Use Group Importance Factor (API 650 Tbl E-5) 1.5 Site Soil Classification D Stiff Soil Table E-3 API 650 IBC 2009 table 1613.5.2

Seismic Use Group IV SUI or I Use: group III essential, II public risk, or I

Thickness of Bottom under the shell (in) 0.2500 tb Min Req'd Thickness of Bottom under shell (in) API 653

Calc'd 7.56 Width of Annular Plate (in) 24.00 L API 650 Appendix E.6.2.1.1.1 API 650 Appendix M Temeprature Modifier 1.00 Tm

Yield of Bottom Under Shell (psi) 30,000 Fby Yield of 1st shell course (psi) 30,000 Fyield 1st Course

API 650 Allowable hoop stress for lower Shell (psi) 23,600 Sd Modulus of Elasticity (psi) 29,000,000 E

Snow Load (psf) 0 IBC 1608.4 or UFC 3-101 -1 tbl F-1

3-sec Gust Design Wind Velocity (mph) 100 V IBC 2009 fig 1609 or UFC 3-101 -1 tbl F-1

Solution:

Uplift ?

Compressive Stress ?

Wind Overturning for 100 mph wind?

© POWERS Engineering and Inspection, Inc. 2014

Find: Product fill height for seismic loading utilizing API 650 11th edition Appendix E Methodology

Wind Overturning OK for API 650. No anchors are required to resist wind overturning

API 650 11th Appendix E Calculations for Lat 36.58945 and Long -115.67967

No Seismic uplift is expected for fill heights < 11.00 (ft)

Good ! Calculated Seismic Compressive Stress is less than Allowable

5 Cone Roof with Internal Aluminum Floater

SEISMIC

BENICIA, CA 94510

Page 17 of 17 Date Printed: 7/28/14 11:14 AM

API 2000 VENTING CALCULATIONS

NA API 2000 Calculations do not apply as this tank has an internal floating roof and 2 open roof vents.

APPENDIX A API 653 CHECKLIST

ENGINEERING & INSPECTION, INC

P.O. BOX 1928

BENICIA, CA 94510

TEL 707 334 3400 FAX 707 922 2284

API 653 Inspection Checklist

AIR FORCE

CREECH AFB

Tank: TK 3

WWW.POWERSEI.COM

POWERS

Thursday, June 26, 2014

Appendix A Page 1 of 13

© 2008 PE&I, Inc API 653 Appendix C Checklist

BENICIA, CA 94510

TEL 707 748 0540 FAX 707 922 2284

API 653 Inspection Checklist

AIR FORCE

CREECH AFB

Tank: TK 3

WWW.POWERSEI.COM

POWERS

1.1 FOUNDATION

All See ReportC.1.1 Measure foundation levelness and bottom elevations (see Appendix B for extent of measurements).

Asphalt N/AC.1.1.2.a Check for settling of tank into asphalt base which would direct runoff rain water under the tank instead of away from it.

N/A Concrete FoundationC.1.1.2.b Look for areas where leaching of oil has left rock filler exposed, which indicates hydrocarbon leakage.

Concrete Ring OkC.1.1.1.a Inspect for broken concrete, spalling, and cracks, particularly under backup bars used in welding butt welded annular rings under the shell.

OkC.1.1.1.b Inspect drain openings in ring, back of waterdraw basins and top surface of ring for indications of bottom leakage.

OkC.1.1.1c Inspect for cavities under foundation and vegetation against bottom of tank.4

OkC.1.1.1d Check that runoff rainwater from the shell drains away from tank.5

OkC.1.1.1e Check for settlement around perimeter of tank.6

Housekeeping OkC.1.1.6.a Inspect the area for buildup of trash, vegetation, and other inflammables buildup.13

Oiled Dirt or Sand N/A Concrete FoundationC.1.1.3.a Check for settlement into the base which would direct runoff rain water under the tank rather than away from it.

Rock N/AC.1.1.4.a Presence of crushed rock under the steel bottom usually results in severe underside corrosion.

Make a note to do additional bottom plate examination (ultrasonic, hammer testing, or turning of coupons) when the tank is out of service.

Site Drainage OkC.1.1.5.a Check site for drainage away from the tank and associated piping and manifolds.11

NOT PERFORMEDC.1.1.5.b Check operating condition of the dike drains.12

1.2 SHELLS

External Visual Inspection

OkC.1.2.1.a Visually inspect for paint failures, pitting, and corrosion.14

OkC.1.2.1.b Clean off the bottom angle area and inspect for corrosion and thinning on plate and weld.15

OkC.1.2.1.c Inspect the bottom-to-foundation seal, if any.16

Internal (Floating Roof Tank) OkC.1.2.2.a Visually inspect for grooving, corrosion, pitting, and coating failures.17

Manways and Nozzles OkC.1.3.1.a Inspect for cracks or signs of leakage on weld joint at nozzles, manways, and reinforcing plates.26

Riveted Shell Inspection NOT RIVETEDC.1.2.3.a Inspect external surface for rivet and seam leaks18

NOT RIVETEDC.1.2.3.b Locate leaks by sketch or photo (location will be lost when shell is abrasive cleaned for painting).19

NOT RIVETEDC.1.2.3.c Inspect rivets for corrosion loss and wear20

NOT RIVETEDC.1.2.3.d Inspect vertical seams to see if they have been full fillet lap welded to increase joint efficiency21

NOT RIVETEDC.1.2.3.e If no record exists of vertical riveted seams, dimension and sketch (or photograph) the rivet pattern: number of rows, rivet size, pitch length, and note whether the joint is butt riveted or lap riveted.

Wind Girder (Floating Roof Tanks) N/AC.1.2.4.a Inspect windgirder and handraiI for corrosion damage (paint faiIure, pifting, corrosion product buildup), especially where it occurs at tack welded junction, and for broken welds.

N/AC.1.2.4.b Check support welds to shell for pitting, especially on shell plates.24

N/AC.1.2.4.c Note whether supports have reinforcing pads welded to shell.25

Thursday, June 26, 2014

Appendix A Page 2 of 13

BENICIA, CA 94510

TEL 707 748 0540 FAX 707 922 2284

API 653 Inspection Checklist

AIR FORCE

CREECH AFB

Tank: TK 3

WWW.POWERSEI.COM

POWERS

1.3 SHELL APPURTENANCES

Autogauge System N/AC.1.3.3.a Inspect autogauge tape guide and lower sheave housing (floating swings) for leaks39

N/AC.1.3.3.b Inspect autogauge head for damage40

N/AC.1.3.3.c Bump the checker on autogauge head for proper movement of tape.41

N/AC.1.3.3.d Identify size and construction material of autogauge tape guide (floating roof tanks).42

NOT PERFORMEDC.1.3.3.e Ask operator if tape tends to hang up during tank roof movement (floating roof tanks).43

NOT PERFORMEDC.1.3.3.f Compare actual product level to the reading on the autogauge (maximum variation is 2 inches).44

NOT PERFORMEDC.1.3.3.g On floating roof tanks, when the roof is in the lowest position, check that no more than two feet of tape are exposed at the end of the tape guide.

N/AC.1.3.3.h Inspect condition of board and legibility of board-type autogauges.46

N/AC.1.3.3.i Test freedom of movement of marker and float.47

Heater (Shell Manway Mounted) N/AC.1.3.5.a Inspect condensate drain for presence of oil indicating leakage51

Manways and Nozzles OkC.1.3.1.b Inspect for shell plate dimpling around nozzles, caused by excessive pipe deflection.27

OkC.1.3.1.c Inspect for flange leaks and leaks around bolting.28

N/AC.1.3.1.d Inspect sealing of insulation around manways and nozzles.29

N/AC.1.3.1.e Check for inadequate manway flange and cover thickness on mixer manways.30

Mixer N/AC.1.3.6.a Inspect for proper mounting flange and support.52

N/AC.1.3.6.b Inspect for leakage.53

N/AC.1.3.6.c Inspect condition of power lines and connections to mixer.54

Shell-Mounted Sample Station NOT PERFORMEDC.1.3.4.a Inspect sample lines for function of valves and plugging of lines, including drain or return-to-tank line.

NOT PERFORMEDC.1.3.4.b Check circulation pump for leaks and operating problems.49

N/AC.1.3.4.c Test bracing and supports for sample lines and equipment.50

Swing Lines: Cable Material and Condition N/AC.1.3.10.a For non-stainless steel cable, check for corrosion over entire length.60

N/AC.1.3.10.b All cable: check for wear or fraying.61

Swing Lines: External Guide System N/AC.1.3.8.a Check for leaks at threaded and flanged joints.58

Swing Lines: Identify Ballast Varying Need N/AC.1.3.9.a Check for significant difference in stock specific gravity.59

Swing lines: Product Sample Comparison N/AC.1.3.11.a Check for water or gravity differences that would indicate a leaking swing joint.62

Swing Lines: Target N/AC.1.3.12.a Target should indicate direction of swing opening (up or down) and height above bottom where suction will be lost with swing on bottom support.

Swing Lines: Winch Operation NOT PERFORMEDC.1.3.7.a Non floating. Raise, then lower the swing line with the winch, and check for cable tightness to confirm that swing line lowered properly.

N/AC.1.3.7.b Floating. With tank half full or more, lower the swing line, then let out cable and check if swing has pulled cable tight, indicating that the winch is operating properly.

N/AC.1.3.7.c Indicator. Check that the indicator moves in the proper direction: Floating swing line indicators show a lower level as cable is wound up on the winch. Non-floating swing line indicators show the opposite.

Tank Piping Manifolds OkC.1.3.2.a Inspect manifold piping, flanges, and valves for leaks.31

OkC.1.3.2.b Inspect fire fighting system components32

Thursday, June 26, 2014

Appendix A Page 3 of 13

BENICIA, CA 94510

TEL 707 748 0540 FAX 707 922 2284

API 653 Inspection Checklist

AIR FORCE

CREECH AFB

Tank: TK 3

WWW.POWERSEI.COM

POWERS

OkC.1.3.2.c Check for anchored piping which would be hazardous to the tank shell or bottom connections during earth movement.

OkC.1.3.2.d Check for adequate thermal pressure relief of piping to the tank.34

N/AC.1.3.2.e Check operation of regulators for tanks with purge gas systems.35

OkC.1.3.2.f Check sample connections for leaks and for proper valve operation36

OkC.1.3.2.g Check for damage and test the accuracy of temperature indicators.37

OkC.1.3.2.h Check welds on shell-mounted davit clips above valves 6 inches and larger.38

1.4 ROOFS

Deck Plate External Corrosion OkC.1.4.2.a Visually inspect for paint failure, holes, pitting, and corrosion product on the roof deck.65

Deck Plate Internal Corrosion OkC.1.4.1.a For safety, before accessing the roof, check with ultrasonic instrument or lightly use a ball peen hammer to test the deck plate near the edge of the roof for thinning. (Corrosion normally attacks the deck plate at the edge of a fixed roof and at the raft

Floating Roof Seal Systems NOT PERFORMEDC.1.4.7.a Measure and record maximum seal-to-shell gaps at: 1.Low pump out. 2. Mid-shell. 3.High liquid level.

OkC.1.4.7.b Measure and record annular space at 30 foot spacing (minimum of four quadrants) around roof and record. Measurements should be taken in directly opposite pairs. 1.Opposite pair 1. 2.

Opposite pair 2.

OkC.1.4.7.c Check if seal fabric on primary shoe seals is pulling shoes away from shell (fabric not wide enough).

OkC.1.4.7.d Inspect fabric for deterioration, holes, tears, and cracks.75

OkC.1.4.7.e Inspect visible metallic parts for corrosion and wear.76

OkC.1.4.7.f Inspect for openings in seals that would permit vapor emissions.77

OkC.1.4.7.g Inspect for protruding bolt or rivet heads against the shell.78

OkC.1.4.7.h Pull both primary and secondary seal systems back all around the shell to check their operation.79

OkC.1.4.7.I Inspect secondary seals for signs of buckling or indications that their angle with the shell is too shallow.

N/AC.1.4.7.j Inspect wedge-type wiper seals for flexibility, resilience, cracks, and tears.81

Internal Floating Roof OkC.1.4.5.a Test for explosive gas on top of the internal floating roof. Readings could indicate a leaking roof, leaking seal system, or inadequate ventilation of the area above the internal floating roof.

Level of Floating Roof OkC.1.4.4.a At several locations, measure distance from roof rim to a horizontal weld seam above the roof. A variance in the readings indicates a nonlevel roof with possible shell out-of-round, out-of-plumb, leaking pontoons, or hang-up. On small diameter tanks, an

Roof Deck Drainage OkC.1.4.3.a Look for indication of standing water. (Significant sagging of fixed roof deck indicates potential rafter failure. Large standing water areas on a floating roof indicate inadequate drainage design or, if to one side, a nonlevel roof with possible leaking

Roof Insulation N/AC.1.4.6.a Visually inspect for cracks or leaks in the insulation weather coat where runoff rain water could penetrate the insulation.

N/AC.1.4.6.b Inspect for wet insulation under the weather coat.70

N/AC.1.4.6.c Remove small test sections of insulation and check roof deck for corrosion and holes near the edge of the insulated area.

1.5 ROOF APPURTENANCES

Autogauge: Float Well Cover

N/AC.1.5.5.a Inspect for corrosion.98

OkC.1.5.5.b Check tape cable for wear or fraying caused by rubbing on the cover.99

Autogauge: Inspection Hatch and Guides (Fixed Roof) OkC.1.5.4.a Check the hatch for corrosion and missing bolts.96

Thursday, June 26, 2014

Appendix A Page 4 of 13

BENICIA, CA 94510

TEL 707 748 0540 FAX 707 922 2284

API 653 Inspection Checklist

AIR FORCE

CREECH AFB

Tank: TK 3

WWW.POWERSEI.C…