API 570 Question Bank (API 570 QB001)

56) What is taken into account by an experienced inspector when selecting TMLs?

a) The amount of corrosion expected

b) The patterns of corrosion that would be expected

c) The number and the cost of reading the TMLs

d) Whether the TMLs are easily accessed

57) In theory, a piping circuit subject to perfectly uniform corrosion could be adequately monitored with __________ TMLs.

a) 1

b) 2

c) 3

d) 4

58) More TMLs should be selected for piping systems with any of the following characteristics:

a) Low potential for creating a safety or environmental emergency in the event of a leak.

b) More complexity in terms of fittings, branches, deadlegs, injection points, etc.

c) Relatively non-corrosive piping systems

d) Long, straight-run piping systems

59) Fewer TMLs can be selected for piping systems with any of the following characteristics:

a) More complexity in terms of fittings, branches, deadlegs, injection points, etc.

b) Higher expected or experienced corrosion rates

c) Long, straight-run piping systems

d) Higher potential for localised corrosion

60) TMLs can be eliminated for piping systems with the following characteristics:

a) Higher potential for creating a safety or environmental emergency in the event of a leak.

b) Low potential for creating a safety or environmental emergency in the event of a leak.

c) Extremely low potential for creating a safety of environmental emergency in the event of a leak.

d) More complexity in terms of fittings, branches, deadlegs, injection points, etc.

61) What is usually the most accurate means for obtaining thickness measurements on installed pipe larger than NPS 1?

a) MT

b) UT

c) PT

d) ET

62) What thickness measuring technique does not require the removal of some external piping insulation?

a) AE

b) UT

c) ET

d) RT

63) When ultrasonic thickness measurements are taken above __________ degrees F, instruments couplants, and procedures should be used that will result in accurate measurements at the higher temperature

a) 150

b) 175

c) 200

d) 250

64) Typical digital thickness gages may have trouble measuring thickness less than __________ inches.

a) 0.2188

b) 0.1875

c) 0.1562

d) 0.1250

65) When pressure testing of piping systems are conducted, they shall be performed in accordance with the requirements of:

a) ASME B31.3

b) ASME B&PV Code, Section VIII

c) SA B16.5

d) API 510

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API 570 Question Bank (API 570 QB001)

15) Select thickness measurement locations (TMLs) within injection point circuits subjected to localised corrosion according to the following guidelines. Select the one that does not belong.

a) Establish TMLs on appropriate fittings within the injection point circuit.

b) Establish at least one TML at a location at least 25 feet beyond the downstream limit of the injection point.

c) Establish TMLs on the pipe wall at location of expected pipe wall impingement or injected fluid.

d) Establish TMLs at both the upstream and downstream limits of the injection point circuit.

16) What are the preferred methods of inspecting injection points ?

a) Radiography and / or ultrasonics

b) Hammer test and / or radiograph

c) Ultrasonics and / or liquid penetrant

d) Liquid penetrant and / or eddy current.

17) During periodic scheduled inspections, more extensive inspection should be applied to an area beginning __________ upstream of the injection nozzle and continuing for at least __________ pipe diameters downstream of the injection point.

a) 10 inches, 20

b) 12 feet, 10

c) 12 inches, 10

d) 10 feet, 10

18) Why should deadlegs in piping be inspected?

a) API 510 mandates the inspection of deadlegs

b) Acid products and debris build up in deadlegs

c) The corrosion rate in deadlegs can vary significantly from adjacent active piping.

d) Caustic products and debris build up in deadlegs.

19) Both the stagnant end and the connection to an active line of a deadleg should be monitored. In a hot piping system, why does the high point of a deadleg corrode and need to be inspected?

a) Corrosion occurs due to directed currents set up in the deadleg

b) Erosion occurs due to convective currents set up in the deadleg.

c) Corrosion occurs due to convective currents set up in the deadleg

d) Erosion occurs due to directed currents et up in the deadleg

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