API 570 Question Bank (API 570 QB001)

20) What is the best thing to do with deadlegs that are no longer in service?

a) Ultrasonically inspect often

b) Radiograph often

c) Inspect often

d) Remove them

21) What are the most common forms of corrosion under insulation (CUI).

a) Localised corrosion of non-ferrous metals and chloride stress corrosion cracking of carbon steel.

b) Localised corrosion of chrome-moly steel and chloride stress corrosion cracking of ferritic stainless steel.

c) Localised corrosion of carbon steel and chloride stress corrosion cracking of austenitic stainless steel

d) Localised corrosion of nickel-silicon alloy and caustic stress corrosion of austenitic stainless steel

22) What climatic area may require a very active program for corrosion under insulation?

a) Cooler northern continent locations.

b) Cooler direr, mid-continent locations

c) Warmer, marine locations

d) Warmer drier, desert locations

23) Certain areas and types of piping systems are potentially more susceptible to corrosion under insulation. Which of the items listed is not susceptible to CUI?

a) Areas exposed to mist over-spray from cooling water towers.

b) Carbon steel piping systems that normally operate in-service above 250 degrees but are in intermittent service.

c) Deadlegs and attachments that protrude from insulated piping and operate at a different temperature than the temperature of the active line.

d) Carbon steel piping systems, operating between 250 degrees F and 600 degrees F.

24) What location is subject to corrosion under insulation and inspection contributes to it?

a) Locations where pipe hangers and other supports exist.

b) Locations where insulator has been stripped to permit inspection of the piping.

c) Locations where insulation plugs have been removed to permit piping thickness measurements.

d) Locations where there is damaged or missing insulation jacketing.

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