API 651 - 3 (Terms & Definition}) Flashcards Preview

API 651 > API 651 - 3 (Terms & Definition}) > Flashcards

Flashcards in API 651 - 3 (Terms & Definition}) Deck (15)
Loading flashcards...
1
Q

The electrode of an electrochemical cell at which oxidation (corrosion) occurs.

A

anode

2
Q

The electrode of an electrochemical cell at which a reduction reaction occurs

A

cathode

3
Q

A technique to reduce corrosion of a metal surface by making the entire surface the cathode of an electrochemical
cell.

A

cathodic protection

4
Q

The portion of the tank bottom steel floor plate that extends horizontally past the outside vertical surface of
the shell

A

chime (or chine) or bottom extension

5
Q

One or more anodes installed vertically at a nominal depth of 15 m (50 ft) or more below the earth’s surface in a single
drilled hole for the purpose of supplying cathodic protection

A

deep anode bed

6
Q

The reduction or prevention of corrosion of a metal in an electrolyte by electrically connecting it to a more anodic
meta

A

galvanic cathodic protection

7
Q

An electric current supplied by a device employing a power source that is external to the electrode system. (An
example is the direct current output of a cathodic protection rectifier.)

A

impressed current

8
Q

The loss of electrons by a constituent of a chemical reaction.

A

oxidation

9
Q

The change from the open-circuit potential of an electrode as a result of current across the electrode/electrolyte
interface.

A

polarization

10
Q

The gain of electrons by a constituent of a chemical reaction

A

reduction

11
Q

An electrode whose open-circuit potential is constant under similar conditions of measurement.

A

reference electrode

12
Q

A group of cathodic protection anodes installed individually, spaced uniformly, and typically buried less than 20 ft (6 m)
below grade.

A

shallow anode bed

13
Q

A conductor of a known electrical resistance through which current flow may be determined by measurement of the
voltage across the conductor and calculation using Ohm’s Law.

A

shunt

14
Q

Current flowing through paths other than the intended circuit

A

stray current

15
Q

An electromotive force, or a difference in electrode potentials expressed in volts. Also known as a potential.

A

voltage