API-571 Online Practice Questions and Answers

Hydrogen permeation or diffusion rates have been found to be minimal at pH _______ and increase at both higher and lower pH's.

A. 4

B. 5

C. 6

D. 7

__________ are the most common type of equipment susceptible to carburization in the refining industry.

A. Reactors

B. Heat exchangers

C. Heater tubes

D. Fin Fans

Hydrogen blisters may form at many different depths from the surface of the steel, in the middle of the plate or near a weld. In some cases, neighboring or adjacent blisters that are at slightly different depths (planes) may develop cracks that link them together. Interconnecting cracks between the blisters often have a __________ appearance.

A. Crescent

B. Eyebrow

C. Step like

D. Jagged

Thermal fatigue damage is in the form of cracking that may occur anywhere in a metallic component where relative movement is constrained, particularly under repeated __________.

A. Cyclic stresses

B. Thermal cycling

C. Pressure variations

D. All of the above

The most important factors affecting graphitization are the chemistry, stress, temperature and _______.

A. Velocity

B. Time at exposure

C. Pressure

D. Ductility

Amine units are used in refineries to remove H²S, CO² and _________ from process streams originating in many units including the coker, crude, FCC and hydrogen.

A. NA²

B. Cl²

C. Mercaptans

D. None of the above

Geometry, stress level, _________ and material properties are the predominate factors in determining the fatigue resistance of a component.

A. Temperature

B. Pressure

C. Velocity

D. Number of cycles

Corrosion rates of the anode can be high if there is a _______ anode to cathode ratio.

A. Large

B. Small

C. Severe

D. None of the above

Atmospheric corrosion:

A. Can cause either uniform or localized wall loss.

B. Always causes localized wall loss.

C. Always causes uniform wall loss.

D. Is best detected using profile RT.

What method is most used to assure boiler feed water corrosion is not occurring?

A. Spot UT readings at turbulent areas

B. Profile RT at turbulent areas

C. Profile RT at stagnant areas

D. Laboratory analysis of boiler feedwater