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: 12.3.2.2

Question 6

NDE - Max Calibrating Interval – For all MT Magnetic Yokes

Answer 6

Daily (prior to use)

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 rectifier

Answer 8

2 months

651: 11.3.2.2

Question 9

NDE - Max Calibrating Interval - RT densitometer

Answer 9

3 months

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 – Max Time - Welder or operator maintains qualifications for a process without using that process

Answer 11

6 months

IX: QW-322.1.a

Question 12

CP - Maximum Interval - Detailed check of CP impressed current facilities

Answer 12

1 year

651: 11.3.2.3

Question 13

CP - Maximum Interval - CP surveys (field potential measurements)

Answer 13

1 year

651: 11.3.1.2

Question 14

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

Answer 14

1 year

653: 13.2.3.d

Question 15

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

Answer 15

1 year

650: 8.6.4.a

Question 16

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

Answer 16

1 year

650: 8.2.3/8.4.3

Question 17

AI – Time period between API AI recertification

Answer 17

3 year

653: D.4.1

Question 18

Intervals - Maximum Interval - UT readings of a tank shell when the corrosion rate is unknown

Answer 18

5 year 653: 6.3.3.2.a

Question 19

Intervals - Maximum Interval - External Inspection

Answer 19

Lesser 5 yr or ¼ life

653: 6.3.2.1

Question 20

AI – Time period between API AI on-line recertification

Answer 20

6 year

653: D.4.4

Question 21

Intervals - Maximum Interval - Initial Internal Inspection (without RBI or other special situations)

Answer 21

10 years

653: 6.4.2.1.1

Question 22

RBI - Maximum Interval - RBI reassessments

Answer 22

10 years

653: 6.4.2.2.2

Question 23

Intervals - Maximum Interval - UT readings of a tank shell when the corrosion rate is known

Answer 23

Lesser 15 yr or ½ life

653: 6.3.3.2.b

Question 24

Intervals - Maximum Interval - Internal Inspection when the corrosion rate is known (without RBI assessment)

Answer 24

Lesser 20 yr or full bttm life

653: 6.4.2.2.1

Question 25

Linings - Typical life of a properly applied tank lining

Answer 25

> 20 years

652: 6.3.2.c & 6.4.2.h

Question 26

PWHT – Normal Holding Time for a PWHT

Answer 26

1 hr / inch

650: 5.7.4

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(f) & T-777.2(f)

Question 28

Records – Length to keep tanks records & recommendations

Answer 28

Life of Tank

653: 6.9.1