Time Intervals

Question 1

Vacuum Box - Minimum duration of each vacuum-testing exam

Answer 1

5 seconds 650: 8.6.8

Question 2

NDE - Minimum time an examiner should be in a darkened area

prior to using a black light for MT & PT exams

Answer 2

5 minutes
V: T-676.4.b
& T-777.2.b

Question 3

NDE - Final interpretation of a PT exam after application of

developer (time range)

Answer 3

10-60
minutes
V: T-676.1

Question 4

Testing - Minimum time to let oil to penetrate when performing
a diesel oil test of shell-to-bottom weld

Answer 4

4 hour
650: 7.2.4.1.d
& 653: 12.1.6.1

Question 5

Testing - Minimum duration for a tank hydrotest to be held at
full height

Answer 5

24 hour 653: 12.3.1

Question 6

NDE - Max Calibrating Interval - Permanent magnet MT Yoke

Answer 6

1 day V: T-762(a)

Question 7

Intervals - Maximum Interval - Routine In-Service inspection

Answer 7

1 month 653: 6.3.1.2

Question 8

CP - Maximum Interval - Routine check of CP impressed

current sources

Answer 8

2 months 651: 11.3.2.2

Question 9

NDE - Max Calibrating Interval - RT densitometer

Answer 9

90 days V: T-262.1

Question 10

Reconstruction - Maximum allowed age of last thickness

readings, used to design a reconstructed tank

Answer 10

180 days 653: 8.4.1

Question 11

Weld Qualification – Maximum Time - Welder or operator
maintains qualifications for a welding process without
using that process

Answer 11

6 months
IX: QW-322.
1.

Question 12

NDE - Max Calibrating Interval - Electromagnetic MT Yoke

Answer 12

1 year V: T-762(a)

Question 13

CP - Maximum Interval - Detailed check of CP impressed

current facilities

Answer 13

1 year 651: 11.3.2.3

Question 14

CP - Maximum Interval - CP surveys (field potential

measurements)

Answer 14

1 year 651: 11.3.1.2

Question 15

NDE - Minimum Time - To keep RT’s acquired during tank

repairs and reconstructions

Answer 15

1 year 653: 13.2.3.d

Question 16

Vac Box – Max Test Interval - Jaeger 2 eye test for VB oper

Answer 16

1 year 650: 8.6.4.a

Question 17

NDE – Max Test Interval - Jaeger 2 eye test for PT/ MT tech

Answer 17

1 year 650: 8.2.3/8.4.3

Question 18

AI – Time period between API AI recertification

Answer 18

3 year 653: D.5.1

Question 19

Intervals - Maximum Interval - UT readings of a tank shell

when the corrosion rate is unknown

Answer 19

5 year 653: 6.3.3.2.a

Question 20

Intervals - Maximum Interval - External Inspection

Answer 20

Lesser 5 yr
or ¼ life
653: 6.3.2.1

Question 21

AI – Time period between API AI on-line recertification

Answer 21

6 year 653: D.5.3

Question 22

Intervals - Maximum Interval - Initial Internal Inspection

without RBI or other special situations

Answer 22

10 years 653: 6.4.2.1.1

Question 23

RBI - Maximum Interval - RBI reassessments

Answer 23

10 years 653: 6.4.2.2.2

Question 24

Intervals - Maximum Interval - UT readings of a tank shell

when the corrosion rate is known

Answer 24

Lesser 15 yr
or ½ life
653: 6.3.3.2.b

Question 25

Intervals - Maximum Interval - Internal Inspection when the

corrosion rate is known (without RBI assessment)

Answer 25

20 yr or full
bttm life
653: 6.4.2.2.1

Question 26

Linings - Typical life of a properly applied tank lining

Answer 26

> 20 years

652: 6.2.2.c &
6. 3.2.i

Question 27

NDE - Max Calibrating Interval - Check the light intensity of a
black light used in a MT or PT exam

Answer 27

Before &
after use
V: T-676.4(e) &
T-777.2(e)