API 570 Question Bank (API 570 QB001)

90) Thickness measurement inspection should be scheduled based on the calculation of not more than 

a) One half the remaining life determined from corrosion rates or the maximum interval of 5 years whichever is shorter.

b) One half the remaining life determined from corrosion rates or the maximum interval allowed by API 570 in Table 1, whichever is shorter

c) One fourth the remaining life determined from corrosion rates or the maximum  interval of 10 years whichever is shorter.

d) One quarter the remaining life determined from corrosion rates or the maximum interval allowed by API 570 in Table 1, whichever is shorter.

91) For external inspections for potential corrosion under insulation (CUI) on Class 1 systems, the examination should include at least __________ percent of all suspect areas and __________ percent of all areas of damaged insulation.

a) 50, 75

b) 50, 33

c) 75, 50

d) 25, 10

92) Piping systems that are known to have a remaining life of over __________ years or that are protected against external corrosion need not have insulation removed for the periodic external inspection.

a) 10

b) 15

c) 5

d) 20

93) For Class 3 piping systems, the examination for corrosion under insulation (CUI) should include at least __________ percent of all suspect areas.

a) 50

b) 30

c) 10

d) 0

94) For Class 2 piping, the extent of CUI inspections on a system operating at – 45oF will be:

a) 75% of damaged areas, 50% of suspect areas

b) 50% of suspect areas, 33% of damaged areas

c) 33% of damaged areas, 50% of suspect areas

d) None of the above

95) Small bore piping (SBP) that is Class I shall be inspected

a) Where corrosion has been experienced

b) At the option of the inspector

c) To the same requirements as primary process piping

d) Only if it has dead legs

96) Inspection of small bore piping (SBP) that is secondary and auxiliary (associated with instruments and machinery) is 

a) Only required where corrosion has been experienced

b) Optional

c) Only if it has dead legs

d) Only if it is threaded

97) If an inspector finds threaded small bore piping (SBP) associated with machinery and subject to fatigue damage, he should:

a) Plan periodically to assess it and consider it for possible renewal with a thicker wall or upgrade it to welded components.

b) Inspect it only if it is corroded and the class of service requires an inspection.

c) Call for dismantling the threaded joints for close inspection to determine if any cracks are in the roots of the threads.

d) Have all the threaded piping renewed at each inspection period.

98) An eight-inch diameter piping system is installed in December 1979. The installed thickness if measured as 0.34". The minimum thickness of the pipe is 0.20". It is inspected 12/83 and the thickness is found to be 0.32". An inspection 12/87 reveals a loss of 0.01" from the 12/85 inspection. During 12/89 the thickness was found to be 0.29". The last inspection was during 12/95 and the thickness was found to be 0.26". What is the long-term corrosion rate of this system?

a) 0.005”/year

b) 0.0075”/year

c) 0.00375”/year

d) 0.0025”/year

99) Using the information in question 95, calculate the short-term corrosion rate:

a) 0.005”/year

b) 0.0075”/year

c) 0.00375”/year

d) 0.0025”/year

100) Using the information in questions 95 and 96, determine the remaining life of the system:

a) 18 years

b) 15 years

c) 12 years

d) 6 years

101) You have a new piping system that has just been installed. It is completely new and no information exists to establish a corrosion rate. Also, information is no available on a similar system. You decide to put the system in service and NDT it later to determine the corrosion rate. How long do you allow the system to stay in service before you take your first thickness readings?

a) 1 month

b) 3 months

c) 6 months

d) 12 months

102) After an inspection interval is completed and if calculations indicate that an inaccurate rate of corrosion has been assumed in a piping system, how do you determine the corrosion rate for the next inspection period?

a) Check the original calculations to find out what the error is in the original assumption.

b) Unless the corrosion rate is higher, the initial rates shall be used.

c) The corrosion rate shall be adjusted to agree with the actual rate found.

d) If the corrosion rate is higher than originally assumed, call in a corrosion specialist.

103) If a piping system is made up of unknown materials and computations must be made to determine the minimum thickness of the pipe, what can  the inspector or the piping engineer do t establish the minimum thickness?

a) The lowest grade material and joint efficiency in the applicable code may be assumed for calculations.

b) Samples must be taken from the piping and testing for maximum tensile stress and yield strength will determine the allowable stress to be used.

c) The piping made of the unknown material must be removed from service and current piping of known material must be installed.

d) The piping of unknown material may be subjected to a hydrostatic stress tests while having strain gages on it to determine its yield strength and thus allowable stress.

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