Free API API-571 Exam Dumps Questions & Answers

(Which of the following is the appropriate method for monitoring hydrochloric acid corrosion susceptibility in an atmospheric crude unit?)

• A.Manual or automatic ultrasonic scanning or profile radiographing of piping, vessels, and exchangers in the system
• B.Measuring the pH of the water in the boot of the overhead accumulator
• C.Using strategically placed corrosion probes or corrosion coupons
• D.Ultrasonic thickness measurements of water injection points

Which of the following can increase the corrosion rate of carbon steel via hydrofluoric (HF) acid corrosion?

• A.Weld hardness above 200 BHN
• B.HF acid concentration above 98%
• C.Oxygen contamination
• D.High nitrogen content in process

The likelihood of brittle fracture is best lessened by:

• A.Frequent inspection of the piping or equipment involved
• B.Using thicker construction materials to lower the resulting stress
• C.Postweld heat treatment (PWHT)
• D.Using carbon or low-alloy steels

Corrosion rates of carbon steel pipe in sulfuric acid service increase significantly:

• A.At acid concentrations above 95%
• B.In stagnant conditions
• C.At acid concentrations below 65%
• D.At acid concentrations above 65%

Damage from oxidation is usually determined by:

• A.Hardness testing
• B.Ultrasonic thickness measurements
• C.Metallographic examination
• D.Hammer testing