API 653 Exam Chapter 12

API 653 Exam Chapter 12 – Tank Linings: API RP 652

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1.

Q1. API 652: galvanic cell corrosion
You are supervising the construction of a new storage tank with an unlined bottom and you want to reduce the chances of corrosion. Which one of these alternative activities would you specify?

 (a) Shot blast the mill scale from the underside of the tank bottom

 (b) Shot blast the mill scale from the topside of the tank bottom

 (c) ‘Weather’ the steel plates outside to increase the thickness of mill scale

 (d) Prepare the plate surface to NACE No. 10 SSPC-PA-6

2.

Q2. API 652: SRB
You have a petroleum product tank that has known SRB corrosion mechanisms occurring in it. Which of these actions should you not take?

 (a) Drain the tank regularly to get rid of water

 (b) Check the steam-heating coils for leaks

 (c) Increase the inspection period so as not to disturb the iron sulphide layer

 (d) Decrease the inspection period and disturb the internals more often

3.

Q3. API 652: the need for bottom linings
Which of these tanks is most likely to respond best to the lining of the tank bottom?

 (a) One with rubble and sand foundations

 (b) A large flexible tank with foundation washout under the tank base

 (c) A small rigid tank on a concrete base

 (d) A floating-roof tank that is regularly completely emptied and filled

4.

Q4. API 652: thin-film bottom linings
A relatively new and lightly corroded tank contains crude oil at 150 ℉. It is decided to clean it out and line it to give it a long life (25+ years). Which of these linings would you choose?

 (a) Thick-film reinforced vinyl ester

 (b) Thick-film unreinforced vinyl ester

 (c) Thin-film reinforced epoxy/amine

 (d) Thin-film unreinforced epoxy/amine

5.

Q5. API 652: thick-film linings
A tank lined with thin-film lining has suffered lining failure and the tank floor is now quite heavily pitted, corroded, and grooved. It has been fully prepared and is now ready for relining. Which of the following would you choose to give the best future performance?

 (a) Thick-film reinforced

 (b) Thick-film unreinforced

 (c) Thin-film reinforced

 (d) Thin-film unreinforced

6.

Q6. API 652: thick-film linings
Which of these is the greatest disadvantage of thick-film reinforced linings when applied to large, old tanks with old foundations, and probably suffering from many years of water contamination?

 (a) It cannot be applied thick enough

 (b) It is prone to cracking

 (c) It is prone to SRB

 (d) It cannot be applied thin enough to fill the pits and hollows

7.

Q7. API 652: surface preparation
Which lining activity requires the best surface finish and cleaning preparation?

 (a) Lining of new tanks, because of mill scale

 (b) Lining of old tanks, because of salt contamination

 (c) Lining of old tanks, because of the rough surface profile (pitting)

 (d) They are all the same

8.

Q8. API 652: lining conditions
What are the environmental requirements for lining application?

 (a) 5 ℃ above dewpoint and relative humidity <90%

 (b) 3 ℃ above dewpoint and relative humidity <80% .

 (c) 3 ℉ above dewpoint and relative humidity <80 %

 (d) 3 ℃ above dewpoint and relative humidity <90%

9.

Q9. API 652: inspection parameters
Which one of these is not the purpose of a holiday test?

 (a) To check for pinholes

 (b) To check for lining adhesion

 (c) To check for discontinuities

 (d) To check for very thin areas of lining

10.

Q10. API 652: top coating an existing lining
How should you prepare an existing, well-adhered lining for a new topcoat?

 (a) Prepare it to SSPC-10

 (b) Prepare it to SSPC-5

 (c) Grind off the top surface with power tools to ASTM D 2583

 (d) Just brush-blast it

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12.5 Tank linings: practice questions

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