NACE CP2 STUDENT MANUAL CHAPTER 6: PIPELINE SURVEY METHODS EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED GRADED A++

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