API-571 Online Practice Questions and Answers

With cooling water corrosion, _________ oxygen content tends to ________ carbon steel corrosion rates.

A. Increasing, increasing

B. Decreasing, decreasing

C. Decreasing, increasing

D. Increasing, decreasing

_________ acid is most often used as a catalyst in polymerization units.

A. Polythionic

B. Naphthenic

C. Phosphoric

D. Sulfuric

Which of these cast irons are not susceptible to graphitic corrosion?

A. Gray cast iron

B. Black Cast iron

C. White cast iron

D. None of the above

Conditions favoring carburization include a high gas phase carbon activity and _______ oxygen potential.

A. Low

B. High

C. Negative

D. Positive

Refractory anchor material must be compatible with the _________ of the base metal

A. Composition

B. Welding

C. Thermal coefficient

D. Ductility

At a given pressure, the H²S concentration in the sour water _________ as temperature _________.

A. Increases, increases

B. Decreases, decreases

C. Increases, decreases

D. Decreases, increases

For pressure vessels, inspection should focus on welds of ________ operating in the creep range.

A. CrMo alloys

B. Carbon steel

C. Stainless steel D. Low hydrogen electrodes

Sulfidation is primarily caused by:

A. Impacting particles.

B. Sulfur compounds decomposing at higher temperatures.

C. Sulfur compounds being created in the FCCU (Cat Cracking Unit).

D. Elemental sulfur collecting in stagnate areas, e.g. dead legs.

E. Operators failing to adequately control the ph of sulfur streams.

In most cases, brittle fracture occurs only at temperatures _________ the Charpy impact transition temperature.

A. Above

B. Below

C. Around

D. Inside

Once cracking from LME has occurred, grinding out the affected area ______ an acceptable fix.

A. Is

B. Is not

C. Can be

D. Can not be