NACE CP2 STUDENT MANUAL CHAPTER 6: PIPELINE SURVEY
METHODS EXAM QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED GRADED A++
A close interval potential survey is a test where structure-to-electrolyte potentials
are measured __________.
A) at 1 to 3 meter spacing along a pipeline
B) at 1 to 3 kilometer spacing along a pipeline
C) at the quaterpoints around a large tank
D) close to the DC power source
a
For steel in concrete what is the probability of corrosion at a potential
of -370 mV?
A) no corrosion
B) <5%
C) 50%
D) >95%
With current (and direction) measured at adjacent spans on a pipeline, which
condition indicates a current discharge.
(Location A is left of Location B)
, A) Location A= 2.0 A (left) Location B= 1.0 A (right)
B) Location A= 2.0 A (right) Location B= 1.0 A (left)
C) Location A= 1.0 A (left) Location B= 1.0 A (left)
D) Location A = 1.0 A (right) Location B= 2.0 A (right)
b
Current pickup on a pipeline is indicated when:
A) the structure-to-electrolyte potential over the pipe is more electronegative than
to each side.
B) the structure-to-electrolyte potential over the pipe is more electropositive than
to each side
C) the two electrode method (side drain) shows the electrode over the pipe is
more electropositive.
D) a CIS shows a more electropositive potential with the rectifier ON than OFF
b
True or False:
A close interval potential survey can be completed on both cathodically
protected and non-cathodically protected structures.
t
The graph illustrates what in the first and second half of the picture
METHODS EXAM QUESTIONS AND ANSWERS WITH COMPLETE
SOLUTIONS VERIFIED GRADED A++
A close interval potential survey is a test where structure-to-electrolyte potentials
are measured __________.
A) at 1 to 3 meter spacing along a pipeline
B) at 1 to 3 kilometer spacing along a pipeline
C) at the quaterpoints around a large tank
D) close to the DC power source
a
For steel in concrete what is the probability of corrosion at a potential
of -370 mV?
A) no corrosion
B) <5%
C) 50%
D) >95%
With current (and direction) measured at adjacent spans on a pipeline, which
condition indicates a current discharge.
(Location A is left of Location B)
, A) Location A= 2.0 A (left) Location B= 1.0 A (right)
B) Location A= 2.0 A (right) Location B= 1.0 A (left)
C) Location A= 1.0 A (left) Location B= 1.0 A (left)
D) Location A = 1.0 A (right) Location B= 2.0 A (right)
b
Current pickup on a pipeline is indicated when:
A) the structure-to-electrolyte potential over the pipe is more electronegative than
to each side.
B) the structure-to-electrolyte potential over the pipe is more electropositive than
to each side
C) the two electrode method (side drain) shows the electrode over the pipe is
more electropositive.
D) a CIS shows a more electropositive potential with the rectifier ON than OFF
b
True or False:
A close interval potential survey can be completed on both cathodically
protected and non-cathodically protected structures.
t
The graph illustrates what in the first and second half of the picture
