PAFB_CP_Report_2018-SPBICL_(Q&A_28_Aug).pdf

www.corrtech-inc.com • (888)842-3944 • Offices in CT, MA, MD, NY

2018 Annual Performance Testing & Calibration

Cathodic Protection Report

Patrick AFB, Florida

Facility 600 Boat Davits

Facility 820 Passenger Terminal

Facility 821 Supply Management

Facility 822 Supply Warehouse

Facility 1317 Control Tower

Facility 1319 Security Forces Operations

Facility 9693 Combat Weapons Training

Facility 10989/10991 Air Force Technical Applications Center

Facility 610 E Fire Water AST

Facility 706 Fire Water AST

Facility 707 Fire Water AST

Facility 948 Fire Water AST

Prepared For:

Patrick AFB

1060 South Patrick Drive

Patrick AFB, FL 32925

Prepared By:

25 South Street

Hopkinton, MA 01748

CorrTech Report No. 12896-FOR-04-1

January 2018

STATEMENT OF LIMITATION

The conclusions presented in this document are based on the services described and not on tasks or procedures beyond the scope of the described procedures or the time and budgetary constraints imposed by the contract limitations.

CorrTech, Inc. has performed this assessment in a professional manner using that degree of skill and care exercised for similar projects under similar conditions by reputable and competent consultants, and in accordance with the procedures established within CorrTech’s quality assurance, quality control protocol.

CorrTech, Inc. shall not be responsible for conditions or consequences arising from relevant facts that were concealed, withheld or not fully disclosed at the time the evaluation was performed.

Report Prepared by:

Morgan Mitchel

NACE CP-2 No. 68218

NACE CIP-2 No. 39766

January 2018

Report Reviewed by:

Scott Paul, PE

NACE Corrosion Specialist No. 4163

TABLE OF CONTENTS

INTRODUCTION

TEST PROCEDURES

CONCLUSIONS

RECOMMENDATIONS

OPERATION & MAINTENANCE: IMPRESSED CURRENT SYSTEMS

DISCUSSION

APPENDIX A

Air Force Form 1688 Annual CP Test Data

APPENDIX B

Air Force Form 491 Bi-Monthly Rectifier Recording Forms

APPENDIX C

Photo Log

Patrick AFB, Florida

INTRODUCTION

Between the dates on January 21st – January 23rd, 2018, our engineers completed the 2018

Annual Performance Testing and Calibration of Cathodic Protection systems at Patrick Air

Force Base. The following report summarizes our findings and recommendations. This report has been divided into thirteen (13) areas for discussion. They are as follows:

Facility 821 Supply Management

Facility 822 Supply Warehouse

Facility 1317 Control Tower

Facility 1319 Security Forces Operations

Facility 9693 Combat Weapons Training

Facility 10989/10991 Air Force Technical Applications Center

Facility 610 E Fire Water AST

Facility 706 Fire Water AST

Facility 707 Fire Water AST

Facility 948 Elevated Water Storage Tank

CorrTech, Inc. engineering personnel performed testing on the various facilities as described.

This work was issued by 45 CONS/LGCAB and dated August 15th, 2017, under CorrTech

Project No. 12896 during the month of January 2018. All testing supervision and evaluations were performed by a NACE International Certified Corrosion Specialist.

Structure associated with Facility 600 Boat Davits is two-(2) aluminum alloy boat davit crane supports submerged in salt water electrolyte. This system consists of four-(4) aluminum or zinc anodes. The existing anode header cables are still in place and can be utilized for future cathodic protection upgrades.

Piping system associated with Facility 820 Passenger Terminal is PVC fire water piping with ductile iron fittings, valves, and hydrants. The below grade ductile iron fire water fittings are protected by five-(5) sacrificial anode cathodic protection test stations consisting of one-(1) or two-(2) magnesium anodes.

Piping system associated with Facility 821 Supply Management is considered to consist of PVC fire water piping with ductile iron fitting, valves, and hydrants. No design information was provided but is consistent with other military installations for fire water piping. The below grade

Patrick AFB, Florida ductile iron fire water fittings are protected by three-(3) sacrificial anode cathodic protection test stations consisting of one-(1) or two-(2) magnesium anodes.

Piping system associated with Facility 822 Supply Warehouse is PVC fire water piping with ductile iron fittings, valves, and hydrants. The below grade ductile iron fire water fittings are protected by six-(6) sacrificial anode cathodic protection test stations consisting of one-(1) or two-(2) magnesium anodes.

Piping system associated with Facility 1317 Control Tower is PVC fire water piping with ductile iron fitting, valves, and hydrants. The below grade ductile iron fire water fittings are protected by eight-(8) sacrificial anode cathodic protection test stations consisting of one-(1) to four-(4) magnesium anodes. As-built drawings that were provided to CorrTech were incorrect with the anode test station locations.

Piping system associated with Facility 1319 Security Force Operations is PVC fire water piping with ductile iron fittings, valves, and hydrants. The below grade ductile iron fire water fittings are protected by five-(5) sacrificial anode cathodic protection test stations consisting of one-(1) or three-(3) magnesium anodes. There are die-electric insulators located on the 4-inch and 6-inch above grade risers located in the mechanical room to isolate the cathodically protected pipe from the buildings electrical ground.

Piping system associated with Facility 9693 Combat Weapons Training is PVC fire water piping with ductile iron fittings, valves, and hydrants. The below grade ductile iron fire water fittings are protected by five-(5) sacrificial anode cathodic protection test stations consisting of one-(1) magnesium anode.

Piping system associated with Facility 10989/10991 Air Force Technical Applications Center is

PVC fire water piping with ductile iron fitting, valves, and hydrants. The below grade ductile iron water fittings are protected by six-(6) sacrificial anode cathodic protection test stations consisting of one-(1) or three-(3) magnesium anodes.

Facility 610 E tank is a 26-foot diameter by 24-foot high 110,000 gallon coated steel above ground fire water storage tank. Previous records indicate that the impressed current cathodic protection system was installed in 1999. The cathodic protection system consists of one-(1)

Universal 24 volt/12 amp auto/manual potential rectifier, four-(4) anode strings suspended from roof hand-holes, and one-(1) copper/copper sulfate reference electrode. The rectifier is mounted on the tank’s shell and the anode string material in not known at this time. Cathodic protection effects are supplied to the internal submerged surfaces.

Patrick AFB, Florida

Facility 706 tank is a 22-foot diameter by 16-foot high 45,000 gallon coated steel above ground fire water storage tank. Previous records indicate that the impressed current cathodic protection system was installed in 1996. The cathodic protection system consists of one-(1) TASCA 20 volt/5 amp auto/manual potential rectifier, three-(3) anode strings suspended from roof hand-holes, and two-(2) copper/copper sulfate reference electrode. The rectifier is mounted on the tank’s shell and the anode string material in not known at this time. Cathodic protection effects are supplied to the internal submerged surfaces.

Facility 707 tank is a 22-foot diameter by 16-foot high 45,000-gallon coated steel above ground fire water storage tank. Previous records indicate that the impressed current cathodic protection system was installed in 1996. The cathodic protection system consists of one-(1) TASCA 20 volt/5 amp auto/manual potential rectifier, three-(3) anode strings suspended from roof hand-holes, and two-(2) copper/copper sulfate reference electrode. The rectifier is mounted on the tank shell and the anode string material in not known at this time. Cathodic protection effects are supplied to the internal submerged surfaces.

Facility 948 tank is a 400,000-gallon capacity elevated water storage tank and is centrally located on the base. The anode material was not presented but from the silver appearance of the anode string the material appears to be 0.162-in platinum clad titanium wire anodes. The impressed current cathodic protection system consists of one-(1) TASCA 30 volt/16 amp automatic/manual potential rectifier, six-(6) platinum clad titanium wire anodes located in the riser and bowl and suspended from the roof hand holes and are hung with weights, and two (2) permanent copper/copper sulfate reference electrodes mounted in the bowl to monitor the protective tank-to-reference electrode potentials. Cathodic protection effects are supplied to the internal submerged surfaces of the bowl and riser.

For ease of discussion, each cathodic protection system is discussed separately.

TEST PROCEEDURES

Quality Assurance

Standard operating procedures (SOPs) and engineering protocols developed for execution of the work are listed below. For quality assurance, each protocol is a direct reference to a section of our corporate Technical Manual and employed in the field on all projects.

CorrTech SOP - Engineering Protocols

• Corrosion Control Review Process

• Jobsite Safety Protocol

Patrick AFB, Florida

• Cathodic Protection System Testing Protocol

• Rectifier Inspection, Installation, Operation and Maintenance

CorrTech’s inspection protocol employed testing procedures, with suitable and calibrated instrumentation, to provide the required information. The inspection team evaluated each structure. The standard protocol was followed, and additional analysis and testing procedures were utilized as determined in the field to ensure proper and adequate evaluation of the structures of interest.

Before going into the field to energize the cathodic protection system the following documentation should be reviewed, copied or brought to the job site for reference:

Design drawings

Project specifications

Special testing requirements

Personal CorrTech Technical Manual

Data sheets, pencils and calculator

Copy of scope of work, proposal etc.

Test Equipment

The following test equipment is required for evaluation of cathodic protection systems:

Suitable voltmeter, Multimeter or MC Miller B3A series meter

Suitable ammeter, Multimeter or MC Miller B3A series meter

Assortment of shunts

Test leads and backups

Portable Copper-Copper Sulfate (Cu/CuSO4) reference electrode

Current interrupter

Miscellaneous hand tools

The following tests were performed and data documented in accordance with CorrTech SOP

4.0:

Obtain system voltage potential measurements:

At all available test stations or permanent reference cell locations

At extremities of the system

Verify accuracy of permanent reference cell

Patrick AFB, Florida

Confirm wire pair continuity, anode header loop and pipe wires, with ohm meter

Determine internal resistance characteristics of anodes, structure and total resistance in accordance with procedures set in the CorrTech Technical Manual section CP Internal, make calculations.

Measure individual anode currents at select locations

To evaluate polarization effects, monitor the protected potential of the structure. Then, measure the instant OFF potential value. Monitor and record delta Vg data at all the test locations utilized in section 1. Calculate depolarization based on OFF potential minus static potential.

Review that 100 mv depolarization and/or -0.85 volts cathodic protection levels have been achieved at test locations.

Where sufficient polarization is not evidenced, the system should be allowed to operate for additional time, up to 1-month at which time the system should be reevaluated by interrupting the system and measuring OFF potentials.

Make all required calculations and draw conclusions before leaving site.

Cathodic protection effectiveness testing and evaluation was conducted in accordance with the requirements of the following latest revisions of standards and procedures:

NACE SP0169 Control of External Corrosion on Underground or Submerged Metallic

Piping Systems

NACE SP0388 Impressed Current Cathodic Protection of Internal Submerged Surfaces of Carbon Steel Water Storage Tanks

AWWA D.104 Automatically Controlled, Impressed-Current Cathodic Protection for The

Interior Submerged Surfaces of Steel Water Storage Tanks

The following criteria is utilized to assess adequate levels of cathodic protection:

A negative (cathodic) “ON” voltage of at least -0.850 volt as measured between the structure and a saturated copper/cooper sulfate reference electrode (CuCuSO4) contacting the electrolyte (soil). For purposes of this analysis, determination of this voltage is made with the protective current applied.

A minimum negative (cathodic) polarization voltage shift of 100-millivolt (0.100-volt) measured between the structure surface and a saturated copper/copper sulfate reference electrode (CuCuSO4) contacting the electrolyte (soil). This polarization

Patrick AFB, Florida voltage shift is to be determined by interrupting the applied protective current and measuring the polarization decay. When the current is initially interrupted, an immediate voltage shift will occur. The voltage reading after the immediate shift shall be used as the base reading from which to measure polarization decay. A negative voltage between all structure surfaces and a stable reference electrode contacting the electrolyte equal to that required for the protection of the most anodic metal should be demonstrated.

CONCLUSIONS

1. Boat davits are NOT receiving adequate cathodic protection levels, as indicated by protected structure-to-electrolyte “On” potentials of -0.809 to -1.357 volts. This structure was identified as not being provided with adequate corrosion control in previous reports.

These are very low potentials for aluminum alloy and troubleshooting and/or upgrades of this system should be implemented to prevent continued corrosion degradation of the boat davits.

2. The four-(4) sacrificial cathodic protection system anodes have completely dissipated resulting in low potential readings and the aluminum davits could be electrically grounded to the reinforced concrete pier causing adverse effects. This could be determined through future troubleshooting and protective current requirement determination.

3. The existing anode header cables are still in place and can be utilized for future cathodic protection upgrades.

1. Four-(4) of the Five-(5) anode test stations are receiving adequate cathodic protection.

Measured pipe-to-earth “On” potentials meet “On” criteria for NACE SP 0169. Polarized

“On” potentials ranging from -1.276 to -1.455 volts. Test station 820-2 potentials indicated inadequate polarization and no shift in voltage during testing.

2. Measured potentials at test station 820-2 showed that the anode header cable is broken below grade therefore not providing any protection to the cathodically protected pipe fittings. Continuity testing also indicated that one-(1) of the two-(2) pipe leads is electrically discontinuous.

Patrick AFB, Florida

Facility 821 Supply Management

1. Two-(2) of the Three-(3) anode test stations are receiving adequate cathodic protection.

Measured pipe-to-earth “On” potentials meet NACE SP 0169 “On” criteria. Polarized

“On” potentials for the passing test stations ranged from -1.201 to -1.439 volts. Test station 821-2 exhibited inadequate polarization and no shift in voltage during testing.

2. Measured potentials at test station 821-2 indicate that the anode header cable is broken below grade, therefore not providing any protection to the cathodically protected pipe fittings.

Facility 822 Supply Warehouse

1. Five-(5) of the Six-(6) anode test stations are receiving adequate cathodic protection.

Measured pipe-to-earth “On” potentials for passing test stations meet NACE SP 0169

“On” criteria. Polarized “On” potentials for the passing test stations ranged from -0.977 to

-1.385 volts. Test station 822-4 had inadequate polarization and no shift in voltage during testing.

2. Measured potentials at test station 822-4 indicate that the anode header cable is broken below grade and is therefore not providing any protection to the cathodically protected pipe fittings.

Facility 1317 Control Tower

1. All eight-(8) anode test stations are receiving adequate cathodic protection. Measured pipe-to-earth “On” potentials for the passing test stations meet NACE SP 0169 “On” criteria. Polarized “On” potentials for the control tower test stations ranged from -0.869 to

-1.613 volts.

2. Test stations 1317-6 and 1317-7 polarized “On” potentials are marginal but considered passing in NACE SP 0169 standard. Consideration should be given to add additional anodes to these two-(2) test stations.

Facility 1319 Security Forces Operations

1. All five-(5) anode test stations are receiving adequate cathodic protection. Measured pipe-to-earth “On” potentials for four-(4) out of five-(5) test stations meet NACE SP 0169

Patrick AFB, Florida

“On” criteria. Test station 1317-3 met NACE SP 0169 100mV polarization criteria.

Polarized “On” potentials for the passing test stations ranged from -0.977 to -1.385 volts.

2. Test stations 1319-3 and 1319-4 polarized “On” and 100 mV polarization potentials are marginal but considered passing in NACE SP 0169 standard. Consideration should be given to add additional anodes to these two-(2) test stations.

Facility 9693 Combat Weapons Training pipe-to-earth “On” potentials for passing test stations met NACE SP 0169 “On” criteria.

Polarized “On” potentials for the passing test stations ranged from -1.075 to -1.411 volts.

Facility 10989/10991 Air Force Technical Applications Center pipe-to-earth “On” potentials for passing test stations met NACE SP 0169 “On” criteria.

Polarized “On” potentials for the passing test stations ranged from -1.182 to -1.522 volts.

2. Internal resistance values could not be obtained on test stations 10989-5 and 10989-6 due to lack of wire length. Only polarized “On” potentials could be measured.

3. All five-(5) test stations wires are extremely short and created issues during the testing process. Consideration should be given to extending all wires in each test station to facilitate future testing.

Facility 610 E Fire Water Storage Tank

1. The rectifier was found “On” and operating properly at an output of 3.805 volts and 0.57 amperes.

2. The effective structure-to-earth resistance was measured and found to be 0.203 ohms to the interior submerged areas of the tank. This indicates that the coating system in in marginal condition.

3. The protective polarized “On” potential measured to the one-(1) permanent copper/copper sulfate reference electrode was found to be -0.998 volts. The subject fire water storage tank is receiving complete cathodic protection as evidenced by all instant

“On” and “Off” potentials being greater than -0.850 meeting multiple criteria listed in

NACE SP 0169.

Patrick AFB, Florida

Facility 706 Fire Water Storage Tank

1. The rectifier was found “Off” when arriving at the tank for testing. The rectifier was activated and tap settings were adjusted multiple times and there was no increase in polarization to the structure or cathodic protection current. CorrTech personnel troubleshot the rectifier and determined that the internal components were damaged.

The rectifier was left de-energized and the system is not providing cathodic protection to the tank internal surface.

2. It should be noted that a bee or wasp nest had previously been located in the interior of rectifier cabinet and appeared that some type of pesticide was sprayed inside the rectifier to kill the nest. From a visual review it appears that the spray may have damaged some of the rectifier’s internal components.

Facility 707 Fire Water Storage Tank

1. The rectifier was found “On” and operating properly at an output of 2.684 volts and 0.05 amperes.

2. The effective structure-to-earth resistance was measured and found to be 3.86 ohms for the interior submerged surfaces of the tank. This indicates that the internal coating system is in good condition.

3. The protective polarized “On” potential measured to the one-(1) permanent copper/copper sulfate reference electrode was found to be -1.085 volts. The subject fire water storage tank is receiving complete cathodic protection as evidenced by all instant

“On” and “Off” potentials being greater that -0.850 meeting multiple criteria listed in

NACE SP 0169.

1. The rectifier was found “On” and operating properly at an output of 1.843 volts and 0.1 amperes for the riser and 1.850 volts and 0.1 amperes for the bowl.

2. The effective structure-to-earth resistance was measured and found to be 1.21 ohms for interior submerged surfaces of the riser and 1.24 ohms for interior submerged surfaces of the bowl. This indicates that the internal coating system in in good condition.

Patrick AFB, Florida

3. The protective polarized “On” potential measured to the two-(2) permanent copper/copper sulfate reference electrode was found to be -0.997 and -1.003 volts. The subject potable water storage tank is receiving complete cathodic protection as evidenced by all instant “On” and “Off” potentials being greater than -0.850 meeting multiple criteria listed in NACE SP 0169.

RECOMMENDATIONS

Based on the critical nature of the stored and delivered product associated with these systems, the quantity of individual systems and NACE International Recommended Practices, the following recommendations have been developed.

1. Additional system troubleshooting should be performed to determine electrical isolation of boat davits from the concrete pier.

2. Install (12) 20 lb. H-1 alloy cast magnesium anodes (3 anodes per boat davit) using existing cable connection. Anode installation should be completed prior to the next scheduled annual survey.

3. This system should be resurveyed in winter of 2019 and/or upon upgrade completion.

1. Install six-(6) 20 lb. high-potential magnesium anodes and a copper/copper sulfate reference electrode at test station 820-2.

2. This system should be resurveyed in winter of 2019 and/or upon upgrades.

Facility 821 Supply Management reference electrode at test station 821-2.

Patrick AFB, Florida

Facility 822 Supply Warehouse reference electrode at test station 822-4.

Facility 1317 Control Tower reference electrode at test station 1317-6.

2. Install six-(6) 20 lb. high-potential magnesium anodes and a copper/copper sulfate reference electrode at test station 1317-7.

3. Drawings should be updated to show correct test station orientation.

4. This system should be resurveyed in winter of 2019 and/or upon upgrades.

Facility 10989/10991 Air Force Technical Applications Center

1. Extend test stations wires in all five-(5) test stations. This might require excavation of the previously installed test stations.

Patrick AFB, Florida

Facility 610 E Fire Water Storage Tank

1. Budgetary planning for ICCP system replacement should be considered for tank 610 E including a new rectifier, mixed metal oxide anode, and reference electrode. Existing

ICCP system is nearing the end of its operational design life.

2. This rectifier should be read bi-monthly and all data should be logged on Air Force form

491.

3. This system should be resurveyed in winter of 2019 and/or upon upgrades.

Facility 706 Fire Water Storage Tank

5. Replace the impressed cathodic protection system in tank 706 with a new rectifier, mixed metal oxide anode, and reference electrode. Existing ICCP system has been damaged and is no longer functional.

1. This rectifier should be read bi-monthly and all data should be logged on Air Force form

Facility 707 Fire Water Storage Tank

1. Budgetary planning for ICCP system replacement should be considered for tank 707 including a new rectifier, mixed metal oxide anode, and reference electrode. Existing

ICCP system is nearing the end of its operational design life.

2. This rectifier should be read bi-monthly and all data should be logged on Air Force form

3. This system should be resurveyed in winter of 2019 and/or upon upgrades.

Patrick AFB, Florida

1. New ICCP system is functioning properly.

2. This system should be resurveyed in winter of 2019.

OPERATION & MAINTENANCE: IMPRESSED CURRENT SYSTEMS

In order to ensure continuous protection of the various steel structures from corrosion, certain periodic maintenance functions must be performed. There are two types of periodic maintenance functions required: monthly and annual functions. The monthly periodic maintenance functions can be performed by base operations personnel. The annual periodic maintenance functions should be performed by a NACE Certificated Corrosion Specialist or Cathodic Protection

Specialist.

Bi-monthly Periodic Maintenance Functions

The following tasks should be performed on a regular monthly basis by base operations personnel.

1. Read and record the rectifier DC current output. This may require a high impedance portable volt/ohm meter and opening of the positive circuit for direct current output reading.

2. Read and record the rectifier DC voltage output.

3. Inspect the rectifier for physical damage.

4. Turn rectifier off by opening the AC disconnect adjacent to the rectifier unit, or on the rectifier face.

5. Check rectifier for excessive heat.

6. Check all connections for tightness and evidence of arcing.

7. Clean interior of rectifier.

8. Turn rectifier on.

9. Recheck rectifier outputs.

10. Clean exterior of unit.

Patrick AFB, Florida

Monthly rectifier recording forms have been provided with this report.

There are a total of four-(4) rectifiers and three-(3) that are turned “ON” and associated with the water systems. One-(1) rectifier is located in Facility 610 E, one-(1) rectifier is located in Facility

706, one-(1) rectifier is located in Facility 707, and one-(1) is Facility 948 and is the elevated water storage tank. All four-(4) are accessible from the existing grade and have voltage and amperage meters permanently mounted. It should be noted the rectifier for Facility 706 fire water storage tank should remain “Off”, as the rectifier is damaged and unable to produce cathodic protection currents.

Annual Periodic Maintenance Functions

A complete Operational Compliance Survey of these cathodic protection systems should be performed on an-annual basis by a competent NACE Certificated Corrosion Specialist or Cathodic

Protection Specialist. The annual Operational Compliance Survey should include the following tasks:

1. Perform monthly maintenance routine.

2. Measure anode-to-structure resistance, structure-to-electrolyte resistance and anode-to-electrolyte resistance.

3. Measure structure-to-reference electrode potentials at all test stations. Perform testing to verify structure polarization in accordance with NACE SP 0169, latest revision.

4. Verify the accuracy of the display module/internal meter readings.

5. Adjust rectifier as required.

6. Submit written report of findings, to be kept in permanent maintenance record.

DISCUSSION

CorrTech, Inc. engineering personnel provided cathodic protection testing in accordance with

NACE SP0169 “Control of External Corrosion on Underground or Submerged Metallic Piping

Systems", NACE SP 0388 “ Impressed Current Cathodic Protection of Internal Submerged

Surfaces of Carbon Steel Water Storage Tanks, and “AWWA D.104 “Automatically Controlled, Impressed-Current Cathodic Protection for The Interior Submerged Surfaces of Steel Water

Storage Tanks”. As part of the corrosion control installation inspection, CorrTech verified that anode placement, reference placement and system wiring was performed properly. Field

Patrick AFB, Florida inspections were performed under the direction of a NACE International Certified Corrosion

Specialist.

Analysis of the data obtained, and subsequent certification of the cathodic protection systems’ effectiveness was performed in accordance with the design specifications, common engineering practices, applicable Federal, State and Local codes and National Association of Corrosion

Engineers (NACE International) Standard Recommended Practice SP 0169-13, latest revision.

The following criteria were used to assess adequate levels of cathodic protection:

A negative (cathodic) “On” voltage of at least 0.850 volt as measured between the structure and a saturated copper/cooper sulfate reference electrode (CuCuSO4) contacting the electrolyte. For purposes of this analysis, determination of this voltage is made with the protective current applied.

A minimum negative (cathodic) polarization voltage shift of 100-millivolt (0.100-volt) measured between the structure surface and a stable reference electrode (CuCuSO4) contacting the electrolyte. This polarization voltage shift is to be determined by interrupting the applied protective current and measuring the polarization decay. When the current is initially interrupted, an immediate voltage shift will occur. The voltage reading after the immediate shift shall be used as the base reading from which to measure polarization decay.

Adequate CP can be achieved at various levels of cathodic polarization depending on the environmental conditions. As such, a single criterion for evaluating the effectiveness of CP might not be satisfactory for all conditions or at all locations along a structure. The use of any approach, including a combination of methods or criteria to achieve adequate corrosion control, is the responsibility of the user, and should be based on the experience of the user and the unique conditions influencing the piping system(s).

In addition to the electrochemical potential criteria, a commonly used benchmark for effective external corrosion control is a reduction in the corrosion rate of the anodic material to 0.025 mm per year (1 mil per year) or less. This condition would be satisfied for buried steel pipe, or representative coupon, in the presence of adequate cathodic protection.

Appendix A

Air Force Form 1688

Annual CP Test Data

Appendix B

Air Force Form 491

Monthly Rectifier Recording Form

CATHODIC PROTECTION OPERATING LOG FOR IMPRESSED CURRENT SYSTEM

1. INSTALLATION 2. YEAR

One-(!) Auto Potential Rectifier, Four-(4) Anode Strings, and One-(1) Copper Sulfate Reference Electrodes

3. PROTECTED STRUCTURE 4. RECTIFIER NUMBER

Internal Submerged Areas Of The Fire Water Storage Tank 610 E

5. RECTIFIER DATA (From Namaepfate) 6. GROUND BED DATA

A. MANUFACTURER A. ANODE MATERIAL

Universal Unknown

B. MODEL NUMBER B. SIZE OF ANODE

AIAI Unknown

C. SERIAL NUMBER C. NUMBER OF ANODES

992917 Four

D. AC RATED CAPACITY D. TYPE OF BACKFILL

115/230 Volt/ 3.6/1.8 Amp Fire Water

E. DC RATED CAPACITY E. DA TE INSTALLED (YYYY MM DD) 7. LOCATION REFERENCE DRAWING

24 Volt/ 12 Amp NO.

1999-01-01

8. CURRENT REQUIRED 9. OPERATING RECORD (Complete on three month intervals)

DATE ADJUSTED CURRENT (AMPS) RECTIFIER

TEST POINT 1

TEST POINT 2

TEST POINT 3

TEST POINT 4

OPERATING RECORD

10. RECTIFIER CIRCUIT TEST POTENTIAL INITIALS

RESISTENCE

SOIL OF

MONTH DAY VOLTS AMPS TEST POINTS (Vo/rs) CONDITION

AS AS AS AS 1 2 3 4

TECHNICIAN

FOUND ADJUSTED FOUND ADJUSTED

G

L M A B C D E F H I J K

JAN 22 3.805 3.805 0.57 0.57 0.149 -0.991 Yhfvl

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

1_.., ,,, s~~ F CATHODIC PR~AE:Z_ £ /( DA TE (YYYY MM DD) /SIGNATURE OF BASE CORROSION ENGINEER I DATE (YYYYMMDD)

M~~ rv t ~,-- 20180122

AF IMT 491 ,/1 9810101, V2 PREVIOUS EDITION IS OBSOLETE.

REMARKS (Date and Initials) CORRECTIVE ACTION (Date and Initials)

- A

S~ CORROSION ENGINEE~ DA TE (YYYY MM DD/

'pftj'~ ~ 20180122

AF IMT 491, 1strfo101, V2 (Reverse)

One-(1) Auto Potential Rectifier, Three-(3) Anode Strings, and One-(1) Copper Sulfate Reference Electrodes 1996

3. PROTECTED STRUCTURE 4. RECTIFIER NUMBER

Internal Submerged Areas Of The Fire Water Storage Tank

5. RECTIFIER DATA (From Namaeplate) 6. GROUND BED DATA

A. MANUFACTURER A. ANODE MATERIAL

TASCA Unknown

B. MODEL NUMBER B. SIZE OF ANODE

20-05 Unknown

C. SERIAL NUMBER C. NUMBER OF ANODES

C-96322 Three

D. AC RATED CAPACITY D. TYPE OF BACKFILL

115 volt/ l .5Amp Fire Water

E. DC RATED CAPACITY E. DATE INSTALLED (YYYY MM DD) 7. LOCATION REFERENCE DRAWING

20 Volt/ 5 Amp NO.

1996-01-01

8. CURRENT REQUIRED 9. OPERATING RECORD (Complete on three month intervals)

DATE ADJUSTED CURRENT (A MPS) RECTIFIER

TEST POINT 1

TEST POINT 2

TEST POINT 3

TEST POINT 4

OPERATING RECORD

10. RECTIFIER CIRCUIT TEST POTENTIAL INITIALS

RESISTENCE

SOIL OF

MONTH DAY VOLTS AMPS TEST POINTS (Vo/rs) CONDITION

AS AS AS AS 1 2 3 4 TECHNICIAN

FOUND ADJUSTED FOUND ADJUSTED G

L

M A B C D E F H I J K

JAN 22 OFF 0.932 OFF 0.00 0.00 -0.523 / YJtn

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

SIGJ:!A~OF CATHODIC P~oi DA TE (YYYY MM 0 0) 'SIGNATURE OF BASE CORROSION ENGINEER I DATE (YYYY MM DD)

. '/vfq'/1/J . 20180122

II AF IMT 491, 19810101, V2 PREVIOUS EDITION IS OBSOLETE.

REMARKS (Date and Initials)

Rectifier found "Off'. Turned rectifier "On" and structure had low voltage potentials and no current. Adjusted the rectifier tap setting multiple times and saw no increase in voltage and cun-ent. It appears that at one time there was a bee/wasp nest located on the interior of rectifier casing and it was sprayed with some type of pesticide. It appears that the pesticide caused an adverse effect to the electrical panels. 1/22/18 MM

(Reverse)

CORRECTIVE ACTION (Date and Initials)

Replace the old damaged rectifier with new rectifier. 1/22/18 MM

DA TE (YYYY MM DD)

20180122

CATHODIC PROTECTION OPERA TING LOG FOR IMPRESSED CURRENT SYSTEM

One-(1) Auto Potential Rectifier, Three-(3) Anode Strings , and Two-(2) Copper Sulfate Reference E lectrodes 1996

3. PROTECTED STRUCTURE 4. RECTIFIER NUMBER

Internal Submerged Areas Of The Fire Water Storage Tank

5. RECTIFIER DATA (From Namaeplate) 6. GROUND BED DATA

A. MANUFACTURER A. ANODE MATERIAL

TASCA Unknown

B. MODEL NUMBER B. SIZE OF ANODE

TASCA 20-5 Unknown

C. SERIAL NUMBER C. NUMBER OF ANODES

C-96327 Three

D. AC RATED CAPACITY D. TYPE OF BACKFILL

115 Volt/ 1.5 Amp Fire Water

E. DC RATED CAPACITY E. DATE INSTALLED (YYYY MM DD) 7. LOCATION REFERENCE DRAWING

20 Volt/ 5 Amp NO.

1996-01-01

8. CURRENT REQUIRED 9. OPERATING RECORD (Complete on three month intervals)

DATE ADJUSTED CURRENT (AMPS) RECTIFIER

TEST POINT 1

TEST POINT 2

TEST POINT 3

TEST POINT 4

OPERATING RECORD

10. RECTIFIER CIRCUIT TEST POTENTIAL INITIALS

RESISTENCE

SOIL OF

MONTH DAY VOLTS AMPS TEST POINTS (Vo/rs) CONDITION

AS AS AS AS 1 2 3 4 TECHNICIAN

FOUND ADJUSTED FOUND ADJUSTED G

L

M A B C D E F H I J K

JAN 22 2.684 2.684 0.05 0.05 0.018 -1.085 /11ffl

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

A, ~~ OF CATHO~~tH DA TE (YYYY MM DD) /SIGNATURE OF BASE CORROSION ENGINEER I DATE (YYYYMM DD) r //1~~ ' 20180122

AF IMT 49'1, 19810101, V2 PREVIOUS EDITION IS OBSOLETE.

REMARKS (Date and Initials) CORRECTIVE ACTION (Date and Initials)

AF IMT 491, 19810101, 'jZ (Reverse)

One-( 1) Auto Potential Rectifier, Two-(2) MMO Anode Strings, and Two-(2) Copper Sulfate Reference Electrodes 2016

3. PROTECTED STRUCTURE 4. RECTIFIER NUMBER

Internal Submerged Areas Of The Elevated Potable Water Storage Tank

5. RECTIFIER DATA (From Namaepfate) 6. GROUND BED DATA

A. MANUFACTURER A. ANODE MATERIAL

TASCA Mixed Metal Oxide

B. MODEL NUMBER B. SIZE OF ANODE

TASCA 30-16 CJRZ251 (SS) Unknown

C. SERIAL NUMBER C. NUMBER OF ANODES

16-580846 Two

D. AC RATED CAPACITY D. TYPE OF BACKFILL

115 Volt/ 6.91 Amp Potable Water

E. DC RATED CAPACITY E. DATE INSTALLED (YYYY MM DD) 7. LOCATION REFERENCE DRAWING 30 Volt/ 16 Amp NO.

2016-01-0 I

8. CURRENT REQUIRED 9. OPERATING RECORD (Complete on three month intervals)

DATE ADJUSTED CURRENT (AMPS) RECTIFIER

TEST POINT 1

TEST POINT 2

TEST POINT 3

TEST POINT 4

OPERATING RECORD

10. RECTIFIER CIRCUIT TEST POTENTIAL INITIALS

RESISTENCE

SOIL OF

MONTH DAY VOLTS AMPS TEST POINTS (Vo/rs) CONDITION

AS AS AS AS 1 2 3 4 TECHNICIAN

A B

FOUND ADJUSTED FOUND ADJUSTED G

L M

C D E F H I J K

JAN 22 1.843 1.843 0.01 0.01 0.005 -1.003 -0.997 /J7/J1

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

,...-7

SI

~ 4~;?XR ~;#M DA TE (YYYY MM DD) /SIGNATURE OF BASE CORROSION ENGINEER I DATE (YYYYMMDD)

AF IMT 491(19810101, V2 PREVIOUS EDITION IS OBSOLETE.

REMARKS (Date and Initials)

Rectifier was shut "Off' after testing so tank could be drained and cleaned. I /22/18 MM

AF IMT 491, 19819'1'01, V2 (Reverse)

CORRECTIVE ACTION (Date and Initials)

After tank is filled with water rectifier should be turned "On" so all submerged internal areas can receive cathodic protection effects.

1/22/18 MM

Appendix C

2018 Annual CP Performance Testing & Calibration

CorrTech Job No. 12896

Cabinet Case With Alarm Facility

948 Rectifier Interior Component’s Rectifier 948

Name Plate Facility 610 E Rectifier Interior Component’s Rectifier 610 E

CorrTech Job No. 12896

Facility 610 E CP Roof Hand-Hole Name Plate Facility 706 Rectifier

Interior Component’s Damaged

Facility 706 Rectifier Name Plate Facility 707 Rectifier

CorrTech Job No. 12896

Interior Component’s Facility 707

Rectifier Facility 707

Facility 600 Boat Davits Facility 600 Boat Davits

CorrTech Job No. 12896

Salt Deposits Aluminum Alloy Boat

Davits Above Grade Piping and Test

Station For Facility 822