UFC 3-570-06
JANUARY 31 2003
CHAPTER 5 UNSCHEDULED MAINTENANCE REQUIREMENTS
Paragraph
5-1
INTRODUCTION............................................................................... 5-1
5-1.1
Troubleshooting ................................................................................ 5-1
5-1.2
Procedures........................................................................................ 5-1
5-2
TROUBLESHOOTING INPRESSED CURRENT SYSTEMS............ 5-1
5-2.1
DC Voltage........................................................................................ 5-1
5-2.2
DC Current ........................................................................................ 5-4
5-2.3
Anode Lead Wires ............................................................................ 5-7
5-2.4
Structure Lead .................................................................................. 5-7
5-2.5
AC Voltage to Stacks ........................................................................ 5-7
5-2.6
Fuses ................................................................................................ 5-8
5-2.7
Diodes ............................................................................................... 5-9
5-2.8
Anode Bed ........................................................................................ 5-9
5-2.9
Rectifier Taps .................................................................................... 5-10
5-2.10
Rectifier input Voltage ....................................................................... 5-11
5-3
IMPRESSED CURRENT SYSTEM COMMON PROBLEMS ............ 5-11
5-4
TROUBLESHOOTING GALVANIC (SACRIFICIAL) CATHODIC
PROTECTION SYSTEMS ................................................................ 5-13
5-4.1
Common Problems ........................................................................... 5-13
5-4.2
Lead Wires ........................................................................................ 5-13
5-4.3
Anode Consumption.......................................................................... 5-13
5-4.4
Improper Use .................................................................................... 5-13
5-5
INTERFERENCE TESTING.............................................................. 5-13
5-6
INTERFERENCE CORROSION CONTROL..................................... 5-14
5-6.1
Correcting Interference ..................................................................... 5-14
5-6.2
Direct Bonding .................................................................................. 5-14
5-6.3
Bonding ............................................................................................. 5-15
5-6.4
Installing a Sacrificial Anode ............................................................. 5-15
5-6.5
Additional Coating ............................................................................. 5-17
5-6.6
Installation of Nonmetallic Sections or Isolations .............................. 5-18
5-6.7
Application of a Small Impressed Current System ............................ 5-18
5-6.8
Combination of Techniques .............................................................. 5-18
CHAPTER 6 INSPECTION PROCEDURES AND CRITERIA
Paragraph
6-1
INTRODUCTION............................................................................... 6-1
6-1.1
Methods ............................................................................................ 6-1
6-2
APPLICABILITY ................................................................................ 6-1
6-3
CRITERIA ......................................................................................... 6-2
6-3.1
Steel and Cast Iron Piping ................................................................ 6-2
6-3.2
Special Conditions ............................................................................ 6-3
6-3.3
Aluminum Piping ............................................................................... 6-4
6-3.4
Copper Piping ................................................................................... 6-4
6-3.5
Dissimilar Metal Piping...................................................................... 6-4
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