Corrosion Engineering Multiple Choice Questions on “ Environments – Petroleum Industry”.
1. Which of the following is/are the general areas of the petroleum industry that faces corrosion problems?
a) Production unit
b) Transportation and storage
c) Refinery operations
d) Production unit, transportation, storage, and refinery operations
Answer: d
Clarification: The Petroleum industry is one of the most affected industries with corrosion. The general areas of the petroleum industry that faces corrosion problems are production unit, transportation, storage, and refinery operations.
2. Which of the following impurities is often present in oil and gas wells?
a) Saline water
b) Sulfides
c) Saline water, sulfides and organic impurities such as ammonia
d) Organic impurities such as ammonia
Answer: c
Clarification: Oil and gas fields consumes a tremendous amount of iron and steel pipe, tubing, casings, pumps, and valves. Saline water, sulfides, and organic impurities such as ammonia are the impurities that are usually present in oil and gas fields.
3. How the corrosion characteristics of a well can be determined?
a) Inspection of surface equipment
b) Analysis of carbon dioxide and organic acid
c) Tubing-caliper surveys
d) Inspection of surface equipment, analysis of carbon dioxide, organic acid and tubing-caliper surveys
Answer: d
Clarification: Corrosion characteristics of a well is determined by
i. Inspection of surface equipment
ii. Analysis of carbon dioxide and organic acid
iii. Coupon exposure tests
iv. Tubing-caliper surveys.
4. Which of the following is/are the neutralizers added to well to minimize corrosion?
a) Ammonia and Sodium carbonate
b) Ammonia, sodium carbonate, sodium hydroxide, and sodium silicate
c) Ammonia and sodium silicate
d) Sodium carbonate and sodium silicate
Answer: b
Clarification: Neutralizers that are added to petroleum to minimize corrosion are:
i. Ammonia
ii. Sodium carbonate
iii. Sodium hydroxide
iv. Sodium silicate and some organic inhibitors.
5. Which of the following metals is/are used for petroleum well valves and wellhead parts?
a) Straight chromium stainless steels and stellite
b) Monel and copper-based alloys
c) Monel, straight chromium steels, stellite, and copper-based alloys
d) Monel and stellite
Answer: c
Clarification: Metals that are usually used for petroleum well valves and wellhead parts are straight chromium stainless steels, stellite, monel, and copper-based alloys.
6. Which of the following prevention methods that are usually employed on a beam of offshore drilling?
a) Paints and other organic coatings
b) Cathodic protection with sacrificial anodes or impressed currents
c) Adding inhibitors
d) Adding inhibitors, paints and other organic coatings and cathodic protection
Answer: d
Clarification: Preventions methods that are usually employed on a beam of offshore drilling are:
i. Paints and other organic coatings
ii. Cathodic protection with sacrificial anodes or impressed currents
iii. Adding inhibitors.
7. Which of the following inhibitor has been effective for internal corrosion domestic fuel oil tanks?
a) Alkaline sodium chromate
b) Sodium silicate
c) Ammonia
d) Sodium carbonate
Answer: a
Clarification: Alkaline sodium chromate or sodium nitrate is an effective inhibitor for the corrosion of domestic fuel oil tanks. The chemical formula of sodium chromate is Na2CrO4.
8. Which of the following impurities that causes corrosion difficulties in refinery operations?
a) Hydrogen sulfide and carbon dioxide
b) Hydrogen sulfide, carbon dioxide, sulfuric acid, and sodium chloride
c) Sodium carbonate and sodium silicate
d) Hydrogen sulfide and sulfuric acid