Time Intervals Flashcards
Vac Box - Min duration of each exam
5 seconds
NDE - Min time an examiner should be in a darkened area prior to using a black light for MT & PT exams
5 minutes
NDE - Final interpretation of a PT exam after application of developer (time range)
10-60 minutes
Testing - Min time to let oil penetrate when performing a diesel oil test of shell-to-bottom weld
4 hours
Testing - Min duration for a tank hydrotest to be held at full height.
24 hours
NDE - Max calibrating interval - for all MT yokes
Daily (prior to use)
Intervals - Max Interval - Routine In-Service Inspection
1 month
CP - Max Interval - Routine check of CP impressed current sources
2 months
NDE - Max Calibrating Interval - RT Densitometer
90 days
Reconstruction - Max allowed age of last thickness readings, used to design a reconstructed tank
180 days “reconstructed aka make the tank do a ONE EIGHTY”
Weld Qual - Max Time - Welder or operator maintains quals for a welding process w/out using it.
6 months
CP - Max Interval - Detailed check of CP impressed current facilities
1 year
CP - Max Interval - CP Surveys (field potential measurements)
1 year
NDE - Min Time - To keep RT’s acquired during tank repairs and reconstructions
1 year
Vac Box - Max Test Interval - Jaeger 2 eye test for VP operator
1 year
NDE - Max Test Interval - Jaeger 2 eye test for PT/MT tech
1 year
AI - Time period between API AI Recert
3 year
Intervals - Max Interval - UT readings of a tank shell when the corrosion rate is unknown
5 year
Intervals - Max Interval - External Inspection
Lesser 5 yr or 1/4 life
AI - Time period between API AI on-line recert
6 years
Intervals - Max Interval - Initial Internal Inspection (without RBI or other special situations
10 years
RBI - Max Interval - RBI reassessments
10 years
Intervals - Max Interval - UT Readings of a tank shell when the corrosion rate is known
Lesser 15 yr or 1/2 life
Intervals - Max Interval - Internal inspection when the corrosion rate is known (w/o RBI assess)
20 yr or full bottom life
