APi653 Chapter 5/6

Question 1

When does tank failure due to brittle fracture ? (4)

Answer 1

1. shortly after erection during hydrostatic testing
2. first filling in cold weather
3. after a change in lower temperature service
4. after repair/alteration

Question 2

How to reduce the risk of BF? (2)

Answer 2

1. demonstrated ability to withstand the combined effects of max liquid level and
2. lowest operating temperature.

Question 3

When is assessment should be made for BF?

Answer 3

1. if service temp is reduced

2. change product to one with greater SG

Question 4

What are some consideration if the tank is not per latest API 650 and will be change to a more severe service? (6)

Answer 4

1. had to have prior hydro demonstrates fitness for continued service
2. Tank thickness 0.5” or below?
3. Operates at above 60F?
4. membrane stress below 7KSI?
5. Tank steel exempt from impact testing?
6. Tank full at lowest one day temp ?

Question 5

Lastly if all consideration is not met, what can be done?

Answer 5

Rerate tank based on prior operating history, (restrict fill height, min metal temp or both)

Question 6

What can be done to establish inspection frequencies?

Answer 6

On stream, NDE methods

Question 7

Frequency of routine inservice inspections?

Answer 7

not exceed ONE month

Question 8

frequency of external inspection and by whom?

Answer 8

LESS (5 years or RCA/4N) , AI

Question 9

frequency of UT (when CR is known and not ) and by whom?

Answer 9

1. Not known = not to exceed 5 years

2. Known = LESS (RCA/2N )

Question 10

When can a UT be subsittued?

Answer 10

During an internal inspection

Question 11

What can supplement on tream UT?

Answer 11

Electromagnetic methods

Question 12

fiberglass-reinforce lining added how many years?

Answer 12

5 years

Question 13

internal thin film coating how many years added?

Answer 13

2 years

Question 14

RPB adds how many years

Answer 14

10 years

Question 15

Cathodic protection adds how many years

Answer 15

5 years

Question 16

bottom corrosion allowance > 0.150” add how many years

Answer 16

=CA-150 miles / CR

Question 17

SS construction adds how man years

Answer 17

10years

Question 18

Without RPB what is max years for inspection?

Answer 18

20 years

Question 19

with RPB what is max years for inspection?

Answer 19

30 years

Question 20

With RBI what is max years ?

Answer 20

no max

Question 21

max subsequent internal inspection interval with and w/o RPB?

Answer 21

20 years w/o and 30 years w/

Question 22

When is an external inspection in lieu of an internal inspection allowed ?

Answer 22

where construction, size, or other aspects allow external access to the tank bottom to determine bottom thickness

Question 23

What does API Annex C contain?

Answer 23

sample checklist of items for consideration when doing inspections.

Question 24

What does a complete record file consist of? (3)

Answer 24

1. construction records,
2. inspection history ,
3. repair history

Question 25

RBI (API 580) shall be reviewed by ?

Answer 25

AI + Engineer

Question 26

When does an RBI not apply?

Answer 26

1. highly viscous substation that solidify at temp below 110F

Question 27

What is API 653 Annex D

Answer 27

Authorized Inspector Certificate