API 651 - 1 (Scope)

Question 1

The purpose of API recommended practice 651 is to

Answer 1

present procedures & practices for achieving effective corrosion control on aboveground storage tank bottoms through the use of cathodic protection

Question 2

API 651 is intended to serve _________ to persons interested in cathodic protection

Answer 2

only as a guide

Question 3

in API 651 , an aboveground storage tank is defined as a stationary container of greater than 500 barrel capacity , usually cylindrical in shape, consisting of a metallic roof, shell, bottom & support structure where more than_______ percent is above surface grade.

Answer 3

90%

Question 4

an electrode of an electrochemical cell at which oxidation( corrosion) occurs is called:

Answer 4

an anode

Question 5

the deterioration of a material,usually a metal because of a reaction with its environment is called

Answer 5

a corrosion

Question 6

a deep anode groundbed uses one or more anodes installed in a single vertical hole typically _______ below the earth’ s surface.

Answer 6

50 feet or more

Question 7

a chemical substance containing ions that migrate in an electric field is referred to as an electrolyte in API 651 an electrolyte refers to the

Answer 7

soil or liquid adjacent to & in contact with the bottom of an aboveground storage tank

Question 8

a_________ is a device for converting alternating current to direct current

Answer 8

rectifier

Question 9

current flowing through paths other than the intended circuit is called

Answer 9

a stray current

Question 10

the fracture of a metal by the combined action of corrosion & tensile stress is referred to as

Answer 10

stress corrosion cracking

Question 11

in API 651 , an aboveground storage tank is defined as a stationary container of ,,,,,,

Answer 11

greater than 500 barrel capacity ,