API 653 Data Sheets-Miscellaneous Numbers

Roofs- Maximum amount of primary seal that can be removed for repair while tank is still in service   653:  9.13.1

NDE- Minimum number of RT's required on a circular shell replacement plate 

FFS- Current joint efficiency "E" in API 650

FFS- Joint efficiency "E"- Calculating t_min  for an LTA, when LTA is away from rivets by ≥ 6"

FFS- Joint efficiency "E"- Calculating t_min for an LTA, when LTA is away from weld by greater of: 1" of 2t   653:  4.3.3.1

Reconstruction- Number of sets of center punch marks located on top and bottom edges of each shell piece    653:  10.3.5.2

Weld Qualification- Number of tension test to qualify a WPS   IX: QW 451.1

Weld qualification- Number of bend tests to qualify a welder or welding operator in welding positions 1G-4G   IX:  QW 452.1.a

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

NDE- RT film density range-allowed for the weld & IQI when using a gamma ray source

NDE- Minimum # of exposures to RT 360° of a weld using a double-wall technique, single wall view   V: T-271.2.a

Impact Test- Number of test bars required in each set of impact test specimens

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

Hot tap- minimum number of UT readings around the circumference of a new hot tapped nozzle    653:  9.14.3.2

Weld Qualification- Number of bend tests to qualify a WPS  IX: QW 451.1

Weld Qualification- Number of bend tests required to qualify a welder in welding positions 5G & 6G  IX:  QW 452.1.a Note 1

FFS- Corrosion averaging in a shell LTA- Minimum # of UT readings to take on each designated vertical line   653:  4.3.2.1.c

NDE- Minimum number of RT's required on a square or rectangular shell replacement plate

Settlement- Minimum number of settlement points around circumference