MacDill-Fac RU105-01 (Tank 1)-FINAL-2017.pdf

US Army Corps of Engineers Omaha District

API 653 In-Service Inspection Report

MacDill Air Force Base, FL Facility RU105-01

Tank 1

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

USACE POL-TCX

6 March 2017

API 653 In-Service Inspection Report MacDill AFB, Florida

Table of Contents

ACRONYMS AND ABBREVIATIONS

GENERAL SUMMARY

THIS INSPECTION

PREVIOUS INSPECTION DATES

RECOMMENDED FUTURE INSPECTION DATES

GENERAL TANK INFORMATION

A. GENERAL PROJECT INFORMATION

1. API 653 Inspection

2. Site Information

3. Future Projects

B. TANK INSPECTION COMMENTS

1. Tank Construction

2. Tank Foundation

3. Tank Shell

4. Tank Appurtenances

5. Tank Coating

6. Tank Piping System

7. Fire Protection System

8. Secondary Containment

C. FINDINGS AND RECOMMENDATIONS

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

2. SIGNIFICANT FINDINGS per API 653, UFC 3-460-01, or AW 78-24-27 Standards

3. RECOMMENDED REPAIRS as Part of Regular Maintenance

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

SHELL THICKNESS CALCULATIONS

TANK DRAWINGS, AND SHELL THICKNESS MEASUREMENTS

OSHA ACCESS STRUCTURE REPORT

APPENDIX B: API 653 CHECKLISTS FOR TANK INSPECTIONS

APPENDIX C: PHOTOGRAPHS

ACRONYMS AND ABBREVIATIONS

API American Petroleum Institute

ASME American Society of Mechanical Engineers

ASNT American Society of Non-Destructive Testing

ATG Automatic Tank Gauge

BBL Barrel

CFR Code of Federal Regulations

CP Cathodic Protection

DFT Dry Film Thickness

FAC Facility

HLA High Level Alarm

HLCS High Level Control Shutoff

HHLA High-High Level Alarm

LLA Low Level Alarm

LLLA Low-Low Level Alarm

MFL Magnetic Flux Leakage

MT Magnetic Particle Testing

NA Not Applicable

NACE National Association of Corrosion Engineers

NDT Non-Destructive Testing

NFPA National Fire Protection Association

PSI Pounds per Square Inch

PT Penetrant Testing

P/V Pressure/Vacuum

RP Recommended Practice

PST Product Saver Tank

RT Radiography Testing

TML Thickness Measurement Location

TRV Thermal Relief Valve

UFC Unified Facilities Criteria

UFGS Unified Facilities Guide Specifications

UT Ultrasonic Testing

VT Visual Testing

GENERAL SUMMARY

Austin Brockenbrough & Associates, LLP (Brockenbrough) was retained by Omaha District USACE under Contract

No. W9128F-12-D-0006 Delivery Order 0021 to perform SPCC Mandated AST/UST Inspections at various locations listed as FY16 AST Group #5. As required by this task, Brockenbrough executed a tank inspection site visit to

MacDill Air Force Base located in Tampa, Florida. An API 653 In-service (visual external) Inspection was conducted for Facility No. RU105-01, locally known as Tank 1, on November 28, 2016. This inspection was performed in accordance with API Standard 653, “Tank Inspection, Repair, Alteration, and Reconstruction,” and the referenced contract. All observations made during this in-service (visual external) inspection were made from the exterior of the tank.

FAC RU105-01 is a 63-foot diameter by 51-foot and 3-inch tall, single wall, vertical, field erected tank with a nominal storage capacity of 25,000 barrels of jet fuel (F-24). The tank has an aluminum internal floating pan. The manufacturer’s data plate indicates the tank was erected in 2002. Stencil on the exterior of the tank shell indicates the tank was cleaned and inspected in 2011. A previous inspection report indicates an out-of-service internal inspection was performed in February 2011.

Secondary containment is provided by a concrete covered earthen berm and dike basin. The design drawings indicate a release prevention barrier under the tank bottom, leak detection ports in the 12-inch high concrete ringwall foundation, and impressed current cathodic protection. The leak detection ports and cathodic protection were verified during the inspection. Details of tank construction and appurtenances are included in the Tank

Information Table on page 6 and in Section ‘B’.

There are no Mandatory Repairs noted that need immediate attention. Additional noted deficiencies are discussed in more detail in Section ‘C’, and should be addressed in a timely manner. Photographs of the tank are included in

Appendix ‘C’.

The next API Standard 653 In-Service (visual external) Inspection should be performed by November 2021. The next ultrasonic thickness inspection of the shell should be performed by February 2026. While the current UFC 3-

460-03 requires out-of-service inspection to occur at least every 10 years of service, an upcoming revision allows the frequency to be extended as determined by a certified API 653 tank inspector. The out-of-service inspection report dated February 2011, recommended the next API Standard 653 Out-Of-Service (internal and external)

Inspection be performed by February 2021. This inspection should include an examination of the tank bottom by magnetic flux leakage (MFL or MFE) technology, and a thorough code compliance evaluation.

GENERAL TANK INFORMATION

ITEM DESCRIPTION

Owner U.S. Air Force

Location MacDill Air Force.

Facility Number RU105-01

Tank Number Tank 1

State / Country Florida / U.S.A.

City Tampa

Inspection Date November 28, 2016

Tank Manufacturer Baker Tank Company

Design Standard API 650 10th Edition (assumed)

Date of Construction 2002

Tank Contents Jet Fuel (F-24)

Tank Serial Number 01291

Tank Diameter 63’-0”

Shell Height 51’-3” (nominal)

Product Height 45’-10” (limited by overflow)

Tank Capacity 25,000 bbl nominal.

Foundation 12” High Concrete Ringwall.

Construction

Bottom 5/16-inch lap welded plate.

Shell

Lower Course: 1/2-inch butt-welded plate.

2nd Course: 7/16-inch butt-welded plate 3rd, 4th and 5th Courses: 5/16-inch butt-welded plate.

6th and 7th Courses: 1/4-inch butt-welded plate.

Floating Roof Aluminum honeycomb.

Fixed Roof Supported cone roof made of 1/4-inch plate.

Material

Bottom Carbon steel of unknown grade.

Shell SA-36.

Floating Roof Aluminum honeycomb

Fixed Roof Carbon steel of unknown grade.

Cathodic Protection Impressed current.

Interior Coating System Interior assumed 100% coated, likely epoxy.

Exterior Coating System Epoxy/polyurethane assumed.

Level Gauging Enraf servo ATG, Varec tape gauge, 8” AL manual gauge ladder well, Vito probe installed in Enraf servo well.

Overfill Protection Independent High, high-high, and low level alarms, ATG Alarms, Float operated HLCV (aluminum CLA Valve).

Piping Receipt 8” Stainless Steel

Issue 16” Stainless Steel

Low Suction NA NA

Water Draw-off 3/4” Stainless Steel

Level Alarms Magnetroll high, high-high and low level alarms, ATG Alarms.

A. GENERAL PROJECT INFORMATION

1. API 653 Inspection

This project will perform API 653 Inspections of various tanks at facilities throughout the United States.

Additional consideration is given to federal, state, and local regulations as well as applicable military criteria and general industry standards.

For Tank RU105-01, an API Standard 653 In-service (External) Inspection was performed.

2. Site Information

On November 28 and 29, 2016 Brockenbrough performed API 653 In-Service (External) Inspection of

Tanks RU105-01 and RU105-02 located at MacDill Air Force Base in Tampa Florida. MacDill Air Force

Base (AFB) is located approximately 4 miles (6.4 km) south-southwest of downtown Tampa, Florida.

Approximately 15,000 people work at MacDill Air Force Base. The Air Mobility Command’s "Eighteenth

Air Force - 6th Air Mobility Wing (AMW) is the host wing for MacDill AFB. In addition to operating KC-

135R Stratotanker and C-37A Gulfstream V aircraft, the 6th AMW provides day-to-day mission support to more than 3,000 personnel in its immediate command, along with more than 50 Mission Partners comprising over 12,000 additional personnel, to include the United States Central Command

(USCENTCOM), United States Special Operations Command (USSOCOM), Special Operations Command

Central (SOCCENT) and a detachment of United States Africa Command (AFRICOM). MacDill also hosts the Aircraft Operations Center of the National Oceanic and Atmospheric Administration, whose NOAA

Corps flies "Hurricane Hunter" missions in WP-3D Orion and Gulfstream IV aircraft. The 6 AMW also has a collocated Associate wing at MacDill, the 927th Air Refueling Wing (927 ARW) of the Air Force

Reserve Command (AFRC). The 6 AMW and the 927 ARW operate and share the same assigned KC-

135R Stratotanker aircraft.

3. Future Projects

Facility personnel indicated that while there are no future projects affecting the tanks, there is a work order to replace the tank’s issue valve.

B. TANK INSPECTION COMMENTS

1. Tank Construction

Tank RU105-01 is a nominal 25,000 bbl, 63-foot diameter by 51-foot and 3-inch tall, aboveground, vertical, jet fuel, storage tank. The tank erector’s nameplate indicates the tank was originally constructed by Baker Tank Company in 2002. The standard of construction is not readable on the nameplate but is assumed to be API 650 10th Edition. As-built drawings of the original construction indicate the tank was built with a cone down bottom, aluminum honeycomb internal floating pan, and a center bottom sump.

2. Tank Foundation

The tank rests on a 12-inch high concrete ringwall foundation. The foundation was visually evaluated during the inspection for broken concrete, spalling, cracks, and vegetation against the bottom of the tank. Other than a few unsealed cracks, no problems were noted with the foundation. A shell settlement survey was performed during the inspection in accordance with Appendix B of API Standard

653. The shell settlement evaluation indicates the settlement of the bottom of the shell and perimeter of the tank bottom is acceptable.

3. Tank Shell

The vertical and cylindrical shell consists of seven butt-welded courses. The exterior of the shell was visually inspected and evaluated for plumbness, roundness, peaking and banding. The shape of the shell appears to be within the allowable tolerances of API Standard 653. The coating was evaluated for deterioration. The ultrasonic thickness measurements of the shell and calculations included in

Appendix A indicate the shell has more than 30 years of remaining life. The interior and exterior of the shell are coated and the exterior of the shell shows no sign of significant deterioration. As the tank is used to store oil, deterioration of the interior of the shell since the previous inspection was performed is extremely unlikely. API 653 recommends ultrasonic thickness measurements of the shell be taken at least every 15 years.

4. Tank Appurtenances

a. Tank Roof

The tank’s steel, lap welded cone roof has scattered but isolated areas of minor pitting to 1/16 inch deep. The six perimeter vent/inspection hatches are inoperable due to water ponding on the roof plate at the hinges, excessive paint on the hinges, and heavy corrosion of the hinges. A guardrail with a 3-inch steel angle top-rail extends all around the perimeter of the lap-welded cone-up roof.

b. Venting

The screen on the roof center vent cover has only 1/8-inch openings. API 650 requires the vent screen to have 1/2-inch openings.

c. Gauging

The tank’s ATG is manufactured by Enraf, and is installed through an 8-inch full-length slotted gauge well. Manual gauging may be performed through an 8-inch gauge hatch over the aluminum ladder gauge well. The tank also has a Varec tape level gauge (autogauge); however, there is moisture/condensation on the inside of the reading window.

d. Level Alarms

The tank has shell mounted high, high-high, and low level alarms. The low level alarm is too low.

The low level alarm is at approximately the 2'-9" level. The as-built drawings indicate internal flanges on the shell nozzles. The top of the issue flange is at the 2'-10" level. The low level of the floating pan should be higher than the top of the internal flanges. Per the AST Standard AW 78-24-

27, the low level alarm should actuate, when issuing fuel, six minutes before the pan touches down in the low leg position, and the low-low level alarm should actuate one minute before the pan touches down. There is no low-low level alarm. There is corrosion on the high level alarm conduit.

e. Stairs and Platforms

The tank’s steel cone roof is accessible by a circumferential stairway mounted on the shell of the tank. The circumferential stairway step rise is generally 8 and 1/2 inches. OSHA requires the rise to be consistent. However, the bottom circumferential stairway step is approximately 18 3/4 inches above the dike basin. Previous modifications attempted to address the gap between the dike basin and the bottom step by installing an 8 1/4-inch high step on the dike basin below the bottom step. However, the resulting rise between the dike basin mounted step and the stairway bottom step is 10 1/2 inches and is also contrary to OSHA.

f. Grounding and Bonding

There are seven grounding cables connected to ground lugs welded to the tank shell.

5. Tank Coating

The interior appears to be 100% coated. There is mold and algae growing on the shell and the roof, isolated coating failure on bottom of shell, isolated areas of tank bottom external extension corrosion, and scattered coating failure and corrosion with localized pitting to 1/16" deep on the roof plates.

There is coating failure and corrosion on the roof scaffold cable supports, the stairway treads, the stairway top platform frame and supports, and the tank isolation valves. There is also corrosion on the high level alarm conduit.

6. Tank Piping System

Fuel is received into the tank from a commercial pipeline through the filter/pumphouse and issued from the tanks through the filter/pumphouse to truck fillstands and to a hydrant system.

7. Fire Protection System

There are four fire hydrants within 300 feet of this tank.

8. Secondary Containment

The tank sits within a concrete secondary containment with concrete covered berms. The secondary containment has a locked drain valve for drainage. A swale in the secondary containment floor provides drainage away from the tank for a distance of 15 to 20 feet from the tank. NFPA 30 paragraph

22.11.2.1 requires the dike basin to be sloped away from the tank for a distance of 50 feet or to the dike wall, whichever is less. The piping runs over and along the swale. NFPA 30 paragraph 22.12.2.1 requires the dike basin to also be sloped away from the piping for a distance of 50 feet. The secondary containment was visually evaluated during the inspection. The volume of the secondary containment is sufficient to hold the contents of the tank full to the bottom of the overflow as required by NFPA 30 plus approximately one foot of freeboard as required by UFC 3-460-01 paragraph 8-14.2.1. Secondary containment seals are 90% failed. Sealant in the cracks in the concrete secondary containment are also failed. However, the as-built construction drawings show a 60 mil liner under the concrete.

C. FINDINGS AND RECOMMENDATIONS

Tank Facility RU105-01 was found to be in generally fair condition. The tank is fully serviceable, with no mandatory deficiencies that would require immediate removal of the tank from service. However, there were several items observed, that are not in full compliance with federal, state, and local regulations or military criteria.

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, or the adjacent environment. The tank would have to be taken out-of-service to complete these repairs. No Mandatory Repairs are required to be performed.

2. SIGNIFICANT FINDINGS per API 653, UFC 3-460-01, or AW 78-24-27 Standards

The following information identifies the significant findings found during the tank inspection, and includes repair recommendations and order of magnitude repair cost estimates. For basis of the cost estimate, it is assumed that the repairs will be completed by local action such as the Reoccurring

Maintenance and Minor Repair program.

a. Replace Floating Pan Perimeter Seal Estimated Cost: $50,000

OBSERVATION: The floating pan perimeter seal has failed. A section of the perimeter seal appears to be missing, as shown in the photograph below. Fuel was observed through the pan-to-shell gap.

There was a strong smell of fuel above the floating pan.

CODE REFERENCE: UFC 3-460-01 paragraph 8-8.3 requires tanks containing mission-critical Class II combustible fuels, such as JP-8, to be equipped with a full contact, aluminum honeycomb floating pan. UFGS Specification 33-56-13.13 requires floating pans to be equipped with flexible double wiper squeegee type seals.

RECOMMENDATION: The next time the tank is taken out of service for cleaning, replace the internal floating pan’s perimeter seal with flexible double wiper squeegee seals. Replace the penetration seals also.

b. Remove Mold and Algae Estimated Cost: $10,000

OBSERVATION: There is mold and algae growing on the roof, shell, and appurtenances. The mold and algae may cause degradation of the exterior coating.

CODE REFERENCE: UFC 3-460-01 paragraph 8-3.10 requires the exterior to be coated.

RECOMMENDATION: Power wash the exterior of the tank and apply an algae and mold/algae inhibitor on a regular basis.

c. Replace Tape Level Gauge System Estimated Cost: $15,000

OBSERVATION: The tape level gauge read 33 feet and 7 3/8 inches, while the ATG read 26 feet and 7

7/16 inches. There is condensation on the inside of the reading window. The gauge head is mounted at the 6-foot elevation above the walking surface. The as-built design drawings indicate the gauge tape is attached directly to the floating pan.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item o, requires a liquid level gauge mounted at 5 feet above the walking surface. Manufacturers of mechanical tape level gauges (Varec and Shand and

Jurs) recommend attaching the tape to a float located under a well in the floating pan or attached to a weight resting on top of the pan, but not directly to the pan as the pan may not descend smoothly with the fuel level and may result in breaking of the tape.

RECOMMENDATION: During the next tank outage, replace the tape level gauge system. Ensure the new tape is attached to a weight resting on top of the pan and not directly to the pan as recommended by the manufacturer.

Varec

d. Replace Roof Perimeter Vent/ Inspection Hatches Estimated Cost: $75,000

OBSERVATION The six roof perimeter vent/inspection hatches are generally inoperable due to painted/corroded hinges. There is water ponding on the roof plate at the hatches. The frames of the roof openings are heavily corroded. The roof penetrations are not reinforced. The latches are not properly installed on two of the hatches, and will not latch.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item h requires inspection hatches on tanks with floating pans. DoD Standard Design AW 78-24-27 requires roof perimeter vent/inspection hatches and hinges made of stainless steel and carbon steel roof penetration reinforcing plates.

RECOMMENDATION: Replace the six perimeter vent/inspection hatches, their penetration frames, and their hinges with stainless steel hatches, frames and hinges. Provide reinforcing plates on the roof penetrations for the perimeter vent/inspection hatches.

e. Provide Additional Roof Support and Replace the Roof Estimated Cost: $200,000

OBSERVATION: The roof support rafters are spaced approximately 24 feet apart. As a result, there is excessive water ponding around the perimeter of the roof, coating failure, and corrosion.

CODE REFERENCE: As early as 1996, API 650 required the rafter spacing at the perimeter of the tank roof to be no greater than 75 inches apart. Later editions of API 650, paragraph 5.10.4.4 increased the maximum allowable spacing to 84 inches.

RECOMMENDATION: Provide additional support for the perimeter roof plates, replace the roof plates, and roof appurtenances. Provide internal and external coatings for the repairs.

f. Replace the Roof Center Vent Screen Estimated Cost: $500

OBSERVATION The screen on the roof center vent has 1/8 inch openings.

CODE REFERENCE: API 650 paragraph H-5.2.2 requires vent screens with 1/2-inch openings. DoD

Standard Design AW 78-24-27 requires the screen to be corrosion resistant.

RECOMMENDATION: Replace the existing roof center vent screen with corrosion resistant screen having 1/2-inch openings.

g. Seal the Cracks in the Ring wall Estimated Cost: $5,000

OBSERVATION: There are numerous hairline cracks in the concrete foundation ringwall. The intrusion of water into the cracks could result in deterioration of the steel reinforcing bars, widening of the cracks, and spalling of the concrete due to expansion of freezing water.

CODE REFERENCE: DoD Standard Design AW 78-24-27 requires tanks to be properly supported on a steel reinforced concrete ringwall.

RECOMMENDATION: Seal the cracks in the concrete ringwall foundation.

Crack

Crack

h. Repair the Tank Bottom to Foundation Seal Estimated Cost: $100

OBSERVATION: There are isolated holes in the tank bottom to foundation seal.

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

RECOMMENDATION: Repair the tank bottom-to-foundation seal to eliminate the isolated holes in the seal.

i. Modify Bottom Stairway Steps Estimated Cost: $5,000

OBSERVATION: The circumferential stairway step rise is generally 8 1/2 inches. However, the bottom circumferential stairway step is approximately 18 3/4 inches above the dike basin.

Previous modifications attempted to address the gap between the dike basin and the bottom step by installing an 8 1/4-inch high step on the dike basin below the bottom step. However, the resulting rise between the dike basin mounted step and the stairway bottom step is 10 1/2 inches.

CODE REFERENCE: OSHA 29 CFR 1910.24 (f) requires the rise of stairway steps to be uniform throughout its entire length, including at its foundation.

RECOMMENDATION: Replace the dike basin mounted step with a landing approximately 8 ½ inches below the bottom shell mounted stairway step.

Hole in seal

Hole in seal

j. Repair External Coatings Estimated Cost: $125,000

OBSERVATION: There is coating failure and corrosion on the tank isolation valves, the scaffold cable supports, circumferential stairway treads, stairway top platform frame and supports, and on the high level alarm conduit. There is isolated coating failure and corrosion on the bottom of the shell and the tank bottom extension. There is scattered coating failure with corrosion pitting as much as

1/16-inch-deep on the roof plates.

CODE REFERENCE: UFC 3-460-01 paragraph 8-3.10 requires the exterior to be coated.

RECOMMENDATION: Replace the coating on the exterior of the tank roof. Repair the coatings on tank isolation valves, the bottom of the shell, the tank bottom extension, the scaffold cable supports, the circumferential stairway top platform frame and supports, and on the high level alarm conduit.

k. Replace the Level Control Valve Estimated Cost: $20,000

OBSERVATION: The 8-inch level control valve is marked “AL” by the manufacturer to indicate it is made of aluminum.

CODE REFERENCE: NFPA 30 paragraph 27.4.3 does not allow valves made of low melting point materials. UFC 3-460-01 paragraph 3-6.7 prohibits use of aluminum valves.

RECOMMENDATION: Replace the 8-inch aluminum level control valve with a steel level control valve.

l. Modify Receipt Piping Estimated Cost: $10,000

OBSERVATION: There is no isolation valve adjacent to and upstream of the 8-inch level control valve to allow maintenance of the control valve. In addition, the existing ball joints do not appear to be required to address seismic activity, tank settlement, or thermal expansion of the piping.

CODE REFERENCE: DoD Standard Design AW 78-24-26 and UFC 3-460-01 paragraph 3-3.1.2 require an isolation valve upstream of a diaphragm control valve.

RECOMMENDATION: Provide an isolation ball valve upstream and adjacent to the level control valve.

Modify the thermal relief piping to protect the piping upstream of the new ball valve. Consideration should also be given to replacing the ball joints on the receipt line with a piping configuration that allows installation of the isolation valve.

“AL”

m. Modify Thermal Relief Piping Estimated Cost: $5,000

OBSERVATION: The thermal relief piping does not have testing tees, and includes sight flow indicators.

CODE REFERENCE: UFC 3-460-01 paragraph 9-3.5 requires TRV piping around piping isolation valves. UFC 3-460-01 paragraph 9-3.5.1 does not allow site flow indicators on thermal relief valve piping. UFC 3-460-03, 6-6.3.1 requires TRV testing be performed annually. DoD Standard Design

AW 78-24-27 requires testing tees on thermal relief piping.

RECOMMENDATION: Modify the thermal relief piping around the piping isolation valves to eliminate the site flow indicators and provide testing tees for testing the thermal relief valves.

n. Relocate Low Level Alarm Estimated Cost: $5,000

OBSERVATION: The low level alarm level is below the top of the issue nozzle internal flange and the low leg level of the floating pan. There is no low-low level alarm independent of the ATG.

CODE REFERENCE: DoD Standard Design AW 78-24-27 requires a low level alarm 6 minutes above the low leg level of the floating pan. UFC 3-460-01, Table 8-1, Item l, requires tanks with floating pans to have both low and low-low level alarms independent of the tank gauging system.

RECOMMENDATION: Demolish the existing low level alarm and provide low and low-low level alarms independent of the ATG at the levels indicated by DoD Standard Design AW 78-24-27.

Low Level

Alarm

Level Alarm Conduit

Issue

o. Provide Low Suction System Estimated Cost: $15,000

OBSERVATION: The 4-inch tank drain is not located next to or hard piped to the main issue piping but is located next to the receipt nozzle. To prepare the tank for cleaning, Base personnel must run a 4-inch hose a quarter of the way around the tank to connect the low suction to the main suction.

CODE REFERENCE: UFC 3-460-01, Table 8-1, Item v, requires tanks to be equipped with a main suction and a low suction per DoD Standard Design AW 78-24-27. DoD Standard Design AW 78-24-

27 indicates a low suction system next to and hard piped to the issue piping.

RECOMMENDATION: Relocate the low suction nozzle and internal piping to near the issue piping and pipe the low suction to the issue piping per DoD Standard Design AW 78-24-27. It may be advisable to also relocate the product saver tank, nozzle and internal piping similarly to simplify access to the interior for inspection and maintenance, as indicated in the DoD Standard Design AW 78-24-27.

p. Relocate Manufacturers Data Plate Estimated Cost: $1,000

OBSERVATION: The manufacturer’s data plate is located behind a davit for a shell manhole cover, and is not fully readable with the manhole cover closed.

CODE REFERENCE: API 650 paragraph 10.1 requires the tank be identified by a nameplate indicating the manufacturer, date of completion, and other information.

RECOMMENDATION: Relocate the tank manufacturer’s nameplate to a location on the shell manhole reinforcing plate that is more accessible for examination.

Low Suction

Issue

Low Suction

Receipt

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. Apply an Algaecide on a Regular Basis

OBSERVATION: There is mold and algae growing on the roof, shell, and appurtenances. The mold and algae may cause degradation of the exterior coating.

CODE REFERENCE: UFC 3-460-01 paragraph 8-3.10 requires the exterior of fuel storage tanks to be coated.

RECOMMENDATION: Power washing of the exterior of the tank and applying an algae and mold/algae inhibitor of the exterior of the tank is included in the Significant Findings section. However, application of an algae and mold/algae inhibitor of the exterior of the tank should be repeated on a regular basis.

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

These items represent repairs and/or upgrades that could be performed to bring the tank into full compliance with current standards, but that do not represent potential risks to system operators, equipment integrity, or the adjacent environment. Our recommendations to perform, or not to perform these repairs and/or upgrades, take into consideration the cost of the repair, the operational benefit of the repairs, the age of the tank/system, operator safety, environmental risks, and equipment integrity.

a. Reseal the Secondary Containment

OBSERVATION: The secondary containment seals are 90% failed. Sealant in the cracks in the concrete secondary containment are also failed. However, the as-built construction drawings indicate a 60 mil liner under the concrete.

CODE REFERENCE: NFPA 30 paragraph 22.11.2.4 and CFR 112.7(c)(1) require dike areas to be liquid tight.

RECOMMENDATION: Replace the secondary containment expansion joint seals and seal the cracks in the secondary containment.

b. Provide OSHA Compliant Roof Manhole

OBSERVATION: The manhole on the roof above the internal ladder does not provide 30 inches of clearance on the climbing side of the ladder. The as-built drawings do not show a deflector plate.

CODE REFERENCE: 29 CFR 1910.27 (c) requires 30-inches of clearance on the climbing side of a ladder at an access hatch, or 24 inches of clearance with a deflector plate.

RECOMMENDATION: Provide a deflector plate on the interior of the roof manhole neck in accordance with 29 CFR 1910.27 (c).

c. Replace Secondary Containment Basin with a Properly Sloped Basin

OBSERVATION: The secondary containment floor is sloped to allow for drainage away from the tank to the swale, which is located approximately half way between the tank and the dike berm. The distance of the swale from the tank varies from 15 to 25 feet from the tank. The product piping runs over the swale and the north dike drain.

CODE REFERENCE: NFPA 30, paragraph 22.11.2.1 requires the dike basin to be sloped away from the tank for a distance of 50 feet or to the dike wall, whichever is less. NFPA 30, paragraph 22.12.2.1.

requires the dike basin to be sloped away from the piping.

RECOMMENDATION: Replace the secondary containment basin with a basin sloped away from the tank all the way to the dike berm and sloped away from the piping in accordance with NFPA 30.

Provide a dike drain in the corner of the dike farthest from the piping.

North Dike Drain

Swale

d. Provide Upper Shell Manhole and Lower Stairway Landing

OBSERVATION: There is no upper shell manhole or circumferential stairway landing for accessing the top of the floating pan.

CODE REFERENCE: UFC 3-460-01 Table 8-1, Item c and DoD Standard Design AW 78-24-27 require new storage tank designs to include an upper shell manhole and a circumferential stairway landing for accessing the top of the floating pan.

RECOMMENDATION: Provide an upper shell manhole and a circumferential stairway landing for accessing the top of the floating pan.

e. Provide Water Bottom Sensor Well

OBSERVATION: There is no water bottom sensor well. The water bottom sensor (Vito probe) is installed in the ATG well, which is located near the perimeter.

CODE REFERENCE: UFC 3-460-01 Table 8-1, Item s and DoD Standard Design AW 78-24-27 require new storage tank designs to include an 8-inch flanged roof nozzle with a 6-inch (150 mm) aluminum, fully slotted, stilling well for a temperature and water bottom sensor, as close as possible to or in, the tank sump.

RECOMMENDATION: Provide an 8-inch flanged roof nozzle with a 6-inch (150 mm) aluminum, fully slotted, stilling well for the temperature and water bottom sensor, as close to as possible or in, the tank sump. Relocate the water bottom sensor to the new well.

APPENDIX A: ENGINEERING CALCULATIONS AND DRAWINGS

Austin Brockenbrough & Associates, L.L.P. Job No. 16-074.01

Location: MacDill AFB Date: 12/22/2016

Subject: Tank RU105-01 - Shell Settlement Evaluation By: Mike O'Connor

API 653 Appendix B

Optimum cosine curve, B 2.2.4.e) Z = a + b x cos(theta + c)

Diameter (D) = 63 (ft)

Number of equally spaced data points (ft)= 8

L = Arc length between measurement points (ft) = 24.74

Tank Height (H) = 51.3 (ft)

ft. * Z U S

0 4 -34.50 0.00 0.00 -0.01 -0.01 -0.03

1 5 -34.38 0.13 0.13 0.08 -0.04 0.00

2 6 -34.13 0.38 0.38 0.30 -0.08 -0.06

3 7 -34.00 0.50 0.50 0.52 0.02 0.06

4 8 -33.88 0.63 0.63 0.61 -0.02 -0.03

5 2 -34.00 0.50 0.50 0.52 0.02 0.00

6 3 -34.25 0.25 0.25 0.30 0.05 0.00

7 4 -34.50 0.00 0.00 0.08 0.08 0.06

8 5 -34.50 0.00 0.00 -0.01 -0.01 -0.07

Maximum out-of-plane deflection = 0.07

* = measured elevation

*HI (Height of Instrument)

Z = calculated ridged body tilt (in)

U = out-of-plane settlement =

S = out-of-plane deflection z-y

Y = yield strength of shell material (PSI) = 36,000

E = Young's modulus of elasticity (lbf/in2) = 29*10^6

S allowable (in) (API 653 B.3.2.1) = (L^2*Y*11)/(2EH)*12 = 0.98 in

Survey

Position

Relative elevation of chime (in.).

R^2 = (Syy - SSE) / Syy = 0.96 >= 0.9 therefore, the curve is valid.

Since the maximum out-of-plane defection (S) is less than the maximum allowable

S, the tank shell settlement is within acceptable limits.

-0.20

0.00

0.20

0.40

0.60

0.80

0 2 4 6 8 10

SHELL THICKNESS CALCULATIONS

The following calculations are pages extracted from the previous tank inspection report.

CORROSION CALCULATIONS

Location: MacDill Facility No. 105 Tank 1 Tank No.: 1

SHELL

Inspection Date: 2011 Previous Inspection Date: 2002 Inspection Interval (Y): 9 years

Course No.

tprev t tmin RCA N Next Visual Next UT

1 0.500 0.499 0.353 0.1460 0.0001 5.0 15.0 2 0.437 0.434 0.297 0.1370 0.0003 5.0 15.0 3 0.312 0.310 0.241 0.0690 0.0002 5.0 15.0 4 0.312 0.310 0.185 0.1250 0.0002 5.0 15.0 5 0.312 0.310 0.129 0.1810 0.0002 5.0 15.0 6 0.250 0.240 0.100 0.1400 0.0011 5.0 15.0 7 0.250 0.240 0.100 0.1400 0.0011 5.0 15.0

Minimum Value (governs): 5.0 15.0 tprev Avg. thickness at last inspection t Avg. thickness at this inspection tmin Minimum thickness for full height product service RCA Remaining corrosion allowance (t - tmin)

N Corrosion Rate (tprev -t) / Y [inches per year] [If corrosion is negligible, N=0.0001 used for calcs]

Next Visual Interval in years. Lesser of (RCA / 4N) or 5 years Next UT Interval in years. Lesser of (RCA / 2N) or 15 years

ROOF

tprev t tmin N L

0.250 0.246 0.090 0.000444 25.0 tmin 0.090 min. per API 653 L Estimated remaining life in years

[limited to 25 years max.] Definitions otherwise same as for Shell.

TANK DRAWINGS, AND SHELL THICKNESS MEASUREMENTS

The following drawings are pages extracted from the previous tank inspection report.

herrerah Text Box MacDILL herrerah Text Box MacDILL

OSHA ACCESS STRUCTURE REPORT

OSHA Stairway Data

OSHA Rq’d

Actual (in) min (in) max (in)

Handrail Height 35 1/2 OK 30 34

Step Width 30 OK 22 NA

Step Rise 8 1/2 OK NA NA

Bottom Step Rise 10/1/2 NOT OK 8 1/4 8 3/4

Dike Basin Mounted Step Rise

8 1/4 OK 8 1/4 8 3/4

BOTTOM STEP

RISE

APPENDIX B: API 653 CHECKLISTS FOR TANK INSPECTIONS

UL SWRI

API Other

Protected

Type: Type:

Size: Date Installed:

Stainless Steel End Conn: Size: 8" Material: Stainless Steel End Conn: Size: 16"

Issue To:

Interior Coating:

Double Bottom

Baker Tank Company

Concrete

146' by 200' by 6'

Level Alarms:

Material: Welded

Coated

Plastic / Fiberglass

Other:

Closed Top Dike

Change of Service:

Last Repair:

Tank Coatings:

Exterior Coating:

Epoxy - Polyurethane

Epoxy

Tank Outside Dimensions:

Insulated

Tank Facility No.:

Local Tank ID No.:

November 28, 2016

RU105-01

Tank Manufacturer:

Tank Construction Date:

Tank 1 Tank Inspector Name:

Jet Fuel (F-24)

25,000 bbl

21,600 bbl

Single Wall

API 653 EXTERNAL INSPECTION CHECKLIST

MacDill AFBProject Site:Project Name:

Project Location:

Brockenbrough Job No.:

SPCC Mandated AST Inspections - Group 5

Various Locations

General Inspection Information

16-074.01

Submitted to:

Contract No.:

USACE - Omaha

W9128F-12-D-0006

Inspection Date:

Design Std

Horizontal

Mike O'Connor

NA

Receipt From:

Inspector Certification Number:

Tank Construction and Configuration

Rectangular

Double Wall

Fire Resistant

Secondary Containment, Overfill, and CRDM

Welded

Truck fillstand and hydrant system

63'-0" dia by 51'-3"

NA

Pipeline through receipt filter-separators

FML

Nominal Capacity:

Useable Capacity:

Open Type DikeVertical original horizontal leak detection ports original

Overfill Protection:

Release Prevention Barrier

Overfill Protection / Level Alarms:

High-high, High, and low 8" hydraulic operated diaphram control valve, Cla Val, Aluminum

Receipt Piping Configuration Issue Piping Configuration

Tank Piping

Secondary Containment

February 2011

Tank Specifications

Previous Tank Inspection Date:

Continuous Release Detection Monitoring

Type:

Date Installed:

Current Product:

API 653 EXTERNAL INSPECTION CHECKLIST

MacDill AFBProject Site:Project Name: SPCC Mandated AST Inspections - Group 5

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Proper operation of dike drains Check for:

a)

b) C.1.1.6 Housekeeping

Buildup of trash, vegetation, and other inflammables

Settlements into the base

C.1.1.2 Asphalt d) a)

8V, 0.6 A b)

c) Cavities under foundation; vegetation against bottom of tank

Broken concrete, spalling, and cracks, especially under backup bars used in welding butt-welded annular rings under the shell

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

Tank settlement into asphalt base

Review cathodic protection potential readings

Site drainage away from the tank, associated piping, and manifolds

Check for:

Presence of crushed rock under the steel bottom which usually results in severe underside corrosion.

C.1.1.4 Rock

C.1.1.5 Site Drainage

C.1.1.7 Cathodic Protection

Measure foundation levelness and bottom elevations (See Annex B) See settlement survey calcs.

ITEM

C.1.1 Foundation

Unsealed cracks in ringwall

Swale varies from 15' to 25' from tank. Piping runs over and along swale and over drain.

Check for:

Indications of bottom leakage at drain openings in ring, back of water-draw basins, and top surface of ring a) b)

Run-off rainwater from shell draining away from the tank

Check for :C.1.1.3 Oiled Dirt or Sand

e) Settlement around perimeter of tank Check for:

STATUS COMMENTSTASK

Check for:

Tank Settlement

C.1.1.1 Concrete Ring

C.1.2.1 External Visual Inspection

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A No access

C.1.2.3 Riveted Shell Inspection

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

e) Drawings of riveted seams if available. Otherwise, dimension and sketch (or photograph) the rivet pattern: no. of rows, rivet size, pitch length, butt-riveted or lap-riveted joints

C.1.2. Shells Check for:

Grooving, corrosion, pitting, and coating failures

a) b) c) c) a)

Pitting on support welds to shell, especially on shell plates d) b)

Seal incomplete (holes) in isolated locations.

Isolated areas of corrosion on the tank bottom extension.

Isolated coating failure on bottom of shell.

Full fillet lap-welded vertical seams to increase joint efficiency b)

Corrosion loss and wear on the rivets

C.1.2.2 Internal (Floating Roof Tank)

Bottom-to-Foundation Seal

Check for:

c)

Broken welds and corrosion damage (paint failure, pitting, corrosion, product builup), especially where it occurs at tack-welded junction

Reinforcing pads welded to shell at supports

Leaks and identify the location by sketch or photo

C.1.2.4 Wind Girder (Floating Roof Tanks) a)

Check for:

Rivet and seam leaks on external surface

Check for:

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

Paint failures, pitting, and corrosion

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Adequate manholes flange and cover thickness on mixer manholes

Moisture/condensation on inside of reading window.

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

b) Damage on autogauge head

Check for:

C.1.3.3 Autogauge System

Anchored piping which would be hazardous to the tank shell or bottom connections during earth movement

Adequate thermal pressure relief of piping to the tank

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

COMMENTSTASKITEM

Fire fighting system componentsb)

C.1.3.2 Tank Piping Manifolds b)

Check for:

Flange leaks and leaks around bolting d)

a) Leaks at piping manifolds, flanges, and valves

C.1.3 Shell Appurtenances

STATUS

Shell plate dimpling around nozzles, caused by excessive pipe deflection e) f)

Check for:

c)

Cracks or signs of leakage on weld joint at nozzles, manholes, and reinforcing plates

C.1.3.1 Manholes and Nozzles c) d) a)

Leaks at sample connections and proper valve operation Damage and test the accuracy of temperature indicators e)

Proper operation of regulators for tanks with purge gas systems

Sealing of insulation around manholes and nozzles

Pass Fail N/A

Pass Fail N/A No access

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

c) Pass Fail N/A

Pass Fail N/A

Pass Fail N/A Pass Fail N/A

Pass Fail N/A f)

Gauge head at 6'-0" elevation.

C.1.3.6 Mixer

Leaks in circulation pump and operating problems

Check for:

c)

a) b)

ITEM TASK STATUS

C.1.3.3 Autogauge System c) d)

C.1.3.4 Shell-mounted Sample Station a)

Inspect condensate drain for presence of oil indicating leakage

C.1.3.5 Heater (Shell Manhole Mounted) e) g)

Actual product level compared to the reading on the autogauge. Make note. (max. variation is 2 in.)

No more than 2 feet of tape are exposed at the end of the tape guide when the roof is in lowest position (floating roof tanks)

h) Condition of board and legibility of board-type autogauges

i) Freedom of movement of marker and float

COMMENTS

Proper mounting flange and support Leakage

Tape 33'-7 3/8"; ATG 26' 7 7/16" 69.44 deg F.

Condition of power lines and connections to mixer

Proper movement of tape by bumping the checker on autogauge headSize and construction material of the autogauge tape guide and make note (floating roof tanks) Proper movement of tape. Ask the operator if the tape tends to hang up during tank roof movement (floating roof tanks).

Check for:

Function of valves and plugging in sample lines, including drain or return-to-tank line

Bracing and supports for sample lines and equipment b)

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

b) Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Check for:C.1.3.10 Swing Lines: Cable Material and Condition a) Corrosion over entire length, for non-stainless steel cable Wear or fraying on all types of cable

C.1.3.11 Swing Lines: Product Sample Comparison

Check for water or gravity differences that would indicate a leaking swing joint

C.1.3.7 Swing Lines: Winch a) Operation

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

ITEM TASK

Check for leaks at threaded and flanged joints

C.1.3.9 Swing Lines: Identify Ballast Varying Need

Check for significant difference in stock specific gravity

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

COMMENTS

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

STATUS

c)

C.1.3.8 Swing Lines: External Guide System

Non-floating: Raise, then lower the swing line with the winch and check for cable lightness to confirm the swing line lowered properly

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Scattered coating failure and corrosion with localized pitting to 1/16" deep on roof plate.

Several areas of standing water around edge of roof. Water ponding at inspection hatches has resulted in severe corrosion of hinges. Hatches are painted shut and hinges are severly corroded. Hatches are inoperable.

ITEM TASK

C.1.4.1 Deck Plate Internal Corrosion

For safety, before accessing the roof, check with ultrasonic instrument or lightly use a ball peen hammer to test the deck plate near the edge of the roof for thinning. (Corrosion normally attacks the deck plate at the edge of a fixed roof and at the rafters in the center of the roof first.)

C.1.4 Roofs

C.1.4.2 Deck Plate External Corrosion

C.1.4.5 Gas Test Internal Floating Roof

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

Look for indication of standing water.

(Significant sagging of fixed roof deck indicates potential rafter failure.

Large standing water areas on a floating roof indicate inadequate drainage design or, if to one side, a nonlevel roof with possible leaking pontoons.)

STATUS

Visually inspect for paint failure, holes, pitting, and corrosion product on the roof deck.

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

C.1.4.3 Roof Deck Drainage

COMMENTS

No access. Hatches generally inoperable due to paint and corroded hinges.

Floating pan perimeter seal failed (section of seal missing) below hatch, which was blown open by the wind. Fuel observable through pan to shell gap. Strong smell of fuel.

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A No access.

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A e)

STATUS COMMENTS

Inspect visible metallic parts for corrosion and wear.

Inspect for openings in seals that would permit vapor emissions.

Inspect for protruding bolt or rivet heads against the shell.

ITEM TASK

C.1.4.6 Roof Insulation

Wet insulation under the weather coat Corrosion on the roof plate and holes near the edge of the insulated area by removing small test sections of insulation

Measure and record annular space at 30-ft spacing (minimum of four quadrants) around roof and record.

Measurements should be taken in directly opposite pairs.

f) g)

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

Inspect fabric for deterioration, holes, tears, and cracks.

c) d)

Check for:

a) b) c)

Crack and leaks in the insulation weather coat where runoff rain water could penetrate the insulation

C.1.4.7 Floating Roof Seal a) Systems

Inspect the condition of the seal, measure and record maximum rim spaces and seal-to-shell gaps around the full roof circumference at the level of inspection. NOTE: Inspection of the seal and measurement of the rim spaces and seal-to-shell gaps at more than one level may be necessary to more fully determine if any problems exist at other levels of tank operation).

b)

Gap in seal below inspection hatch. Fuel visible through gap.

Pass Fail N/A No access.

Pass Fail N/A

Pass Fail N/A

Check for:

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

C.1.5 Roof Appurtenances

ITEM TASK STATUS

Reinforcing pad where sample hatch pipe penetrates the roof deck.

Operation of recoil reel and condition of rope on floating roof sample hatch and recoil systems

C.1.5.1 Sample Hatch g) i) j)

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

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

Inspect wedge-type wiper seals for flexibility, resilience, cracks, and tears.

C.1.4.7 Floating Roof Seal h) Systems

Presence and condition of protective coating or liner inside sample hatch (preventing rust from pipe getting into sample) on ultra clean stocks such as JP4

Aluminum

h) Operation of system

COMMENTS

a) b) c) d) e) f)

Condition and functioning of sample hatch cover.

Condition of seal inside hatch cover on tanks governed by Air Quality Monitoring District rules Corrosion and plugging on thief and gauge hatch cover.

Marker and tab stating hold-off distance, where the sample hatch is used to reel gauge stock level

Pass Fail N/A No access

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A No access

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Coating failure and corrosion on scaffold supports.

Check for:

C.1.5.8 Gauging Platform Drip Ring

Check condition of screens, locking and pivot pins.

On fixed roof tanks with drip rings under the gauging platform or sampling area, inspect for plugged drain return to the tank.

Wear or fraying caused by rubbing of the tape cable on the cover b)

Inspect scaffold support for corrosion, wear and structural soundess.

C.1.5.3 Fixed Roof Scaffold Support

C.1.5.6 Sample Hatch (Internal Floating Roof) a) Overall conditions

Automatic sealing after sampling, when equipped with a fabric seal Proper operations when equipped with a recoil reel opening device b) c)

C.1.5.7 Roof-Mounted Vents (Internal Floating Roof)

C.1.5.4 Autogauge: Inspection Hatch & Guides (Fixed Roof) a)

Condition of roof guide for gauge well, particularly the condition of the rollers for grooving on floating roofs The distance from the gauge well pipe to the tank shell at different levels, if accessible

TASK

C.1.5.2 Gauge Well

C.1.5.5 Autoguage: Float Well Cover a) Corrosion b) c) a)

Check for:

b) Corrosion on the tape guide's and flost guide's wire anchors

Corrosion and missing bolts on the hatch e)

Thinning, size of slots, and cover condition of the visible portion of the gauge well A hold-off distance marker and tab with hold-off distance (legible)

ITEM

d)

Check for:

Check for:

STATUS COMMENTS

No hatch

No access

Hatches generally inoperable due to paint and corroded hinges.

Valve leakage and for presence of a bull plug or blind flange, if the tank has a gauge well washer

Pass Fail N/A No access

Pass Fail N/A No access

Pass Fail N/A No access

Pass Fail N/A

Pass Fail N/A

Pass Fail N/A

Pass…