API 653 Data Sheets-Miscellaneous Numbers

  1. Roofs- Maximum amount of primary seal that can be removed for repair while tank is still in service   653:  9.13.1
    1/4
  2. NDE- Minimum number of RT's required on a circular shell replacement plate 
    • 653:  12.2.1.6.1
    • 1
  3. FFS- Current joint efficiency "E" in API 650
    • 653:  Table 4.2
    • 1.0
  4. FFS- Joint efficiency "E"- Calculating tmin  for an LTA, when LTA is away from rivets by ≥ 6"
    • 653:  4.3.4.1
    • 1.0
  5. FFS- Joint efficiency "E"- Calculating tmin for an LTA, when LTA is away from weld by greater of: 1" of 2t   653:  4.3.3.1
    • "E" defined
    • 1.0
  6. Reconstruction- Number of sets of center punch marks located on top and bottom edges of each shell piece    653:  10.3.5.2
    2
  7. Weld Qualification- Number of tension test to qualify a WPS   IX: QW 451.1
    2
  8. Weld qualification- Number of bend tests to qualify a welder or welding operator in welding positions 1G-4G   IX:  QW 452.1.a
    2
  9. NDE- Minimum # of exposures to RT 360° of a weld using a double-wall technique, double-wall view (elliptical shot)  V: T-271.2.b.1
    2
  10. NDE- RT film density range-allowed for the weld & IQI when using a gamma ray source
    • V: T-282.1
    • 2.0-4.0
  11. NDE- Minimum # of exposures to RT 360° of a weld using a double-wall technique, single wall view   V: T-271.2.a
    3
  12. Impact Test- Number of test bars required in each set of impact test specimens
    • 650:  4.2.9.3
    • 3
  13. NDE- When using a shim under a hole-type IQI, the number of sides of the IQI that must be seen in the RT image  V: T-277.3
    3
  14. Hot tap- minimum number of UT readings around the circumference of a new hot tapped nozzle    653:  9.14.3.2
    4
  15. Weld Qualification- Number of bend tests to qualify a WPS  IX: QW 451.1
    4
  16. Weld Qualification- Number of bend tests required to qualify a welder in welding positions 5G & 6G  IX:  QW 452.1.a Note 1
    4
  17. FFS- Corrosion averaging in a shell LTA- Minimum # of UT readings to take on each designated vertical line   653:  4.3.2.1.c
    5
  18. NDE- Minimum number of RT's required on a square or rectangular shell replacement plate
    • 653:  12.2.1.6.2
    • 6
  19. Settlement- Minimum number of settlement points around circumference
    • 653:  12.5.2 & Fig B.1
    • 8
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API 653 Data Sheets-Miscellaneous Numbers
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API 653 Data Sheets-Miscellaneous Numbers
Updated