API 1632 Cathodic Protection of Underground Storage Systems Flashcards
What are the four components of an electrochemical corrosion cell? (API 1632, Section 2.1)
What happens at the anode of the corrosion cell? (API 1632, Section 2.1)
What does not happen at the cathode of a corrosion cell? (API 1632, Section 2.1)
What happens along the metallic path connecting the anode and cathode? (API 1632,
Section 2.1
What is the electrolyte in the case of buried structures such as underground tanks and
piping? (API 1632, Section 2.1)
Which component of a corrosion cell is generally created in an area of relatively low oxygen
concentration? In an area of relatively high oxygen concentration? How does this affect
buried tanks? (API 1632, Section 2.2.1.3)
What are four soil characteristics that can influence the rate of corrosion on buried steel
structures? (API 1632, Section 2.2.1.4
What are the most damaging stray currents? Where do they typically come from?
(API 1632, Section 2.2.2.2)
Under what conditions does bimetallic corrosion occur? (API 1632, Section 2.2.2.3)
In a bimetallic corrosion cell, where does the most severe corrosion attack occur?
(API 1632, Section 2.2.2.3)
How does cathodic protection work? (API 1632, Section 2.3.1
What are two methods of applying cathodic protection to underground metal structures?
(API 1632, Section 2.3.1)
In a galvanic cathodic protection system, all the elements of a corrosion cell are
intentionally created. What type of metal is used for the anode (the place where corrosion
occurs)? (API 1632, Section 2.3.2.1)
As a corrosion cell develops on an underground storage tank where a galvanic cathodic
protection system has been established, what happens at the anode? What happens at the
cathode? (API 1632, Section 2.3.2.1
What are seven advantages of galvanic cathodic protection systems? (API 1632,
Section 2.3.2.2)
a)
b)
c)
d)
e)
f)
g)
What metal has the most negative potential (greatest negative voltage) when measured
relative to a copper/copper sulfate reference electrode? (API 1632, Table 1)
What are four disadvantages of galvanic cathodic protection systems? (API 1632,
Section 2.3.2.3)
a)
b)
c)
d)
What materials are used to manufacture anodes in an impressed current cathodic protection
system? (API 1632, Section 2.3.3.1
What are five advantages of impressed current cathodic protection systems? (API 1632,
Section 2.3.3.2)
a)
b)
c)
d)
e)
What are five disadvantages of impressed current cathodic protection systems? (API 1632,
Section 2.3.3.3)
a)
b)
c)
d)
e)
Which type of cathodic protection system is normally required for existing underground
tank installations? (API 1632, Section 2.3.4.1)
A plot plan of a cathodically protected facility should identify which components of the
cathodic protection system? (API 1632, Section 2.3.5
What are sacrificial anodes usually made of? (API 1632, Section 3.1.1)
In what type of soils are zinc anodes best utilized? (API 1632, Section 3.1.1)