API 653 Data Sheets
Fitness For Service – answer API 579
Low Pressure Storage Tanks – answer API 620
Risked Based Inspection - answerAPI 580
Cathodic Protection - answerAPI 651
Tank Bottom Linings - answerAPI 652
Welding on in service equipment containing flammables - answerAPI 2201
NDE Procedure Guidlines - answerASME Section V
Acceptance Standards for RT of welds - answerASME Section 8, Div. 1
Alternative evaluation for pits and LTA's - answerASME Section 8, Div. 2
Welder Qualification - answerASME Section IX
Weld Procedure Qualification - answerASME Section IX
Impact testing method and equipment requirements - answerASTM A370
Requirement for new welding electrodes - answerAWS
NDE personnel qualification (RT and UT flaw detection) - answerASNT SNT-TC-1A
API 650 Appendix for frangible roofs - answerAppendix F
API 650 Appendix for hot tanks - answerAppendix M
Maximum allowed vertical length of pits on a tank shell - answer2" in 8" Line
Max allowed length of pits in the critical zone that can be repaired by weld build up -
answer2" in 8" arc
Radial length of critical zone measured from shell - answer3"
Bottoms- suggested pad thickness - answer3-4"
, Minimum distance between clusters of surface porosity - answer4"
Minimum dimension of shell lap-patch - answer4"
Minimum radius of shell flush-patch - answer6"
When calculating tmin for shell LTA, minimum distance away from a rivet where "E" is
always 1.0 - answer6"
Minimum size of a bottom lap-patch that does NOT cross a bottom seam - answer6"
Minimum distance between a bottom lap patch and the shell for patches that do NOT
extend to the shell - answer6"
If reusing shell plates, minimum distance to cut from existing shell welds (if plates are
not deseamed) - answer6"
Minimum diagnostic length of RT for vertical or horizontal welds - answer6"
Minimum length of RT when qualifying a welder with RT using a coupon or 1st
production weld - answer6"
Minimum length of RT when qualifying a weld operator with a test coupon - answer6"
Minimum distance to overlap a shell weld when using a lap patch - answer6"
Area to dig when checking for soil-to-air corrosion - answer6-12"
Typical size of a vacuum box - answer6"X30"
Minimum dimension of a shell flush patch - answer12" or 12 times thickness of
replacement plate, whichever is greater
Bottoms-minimum distance a 3 lap joint can be from: other 3 lap joints, the shell or
annular plate joints - answer12"
Minimum dimension of bottom lap patch that crosses a bottom seam - answer12"
Foundations- suggested height above grade for new tank bottoms - answer12"
When adding a shell flush patch that extends to a horizontal shell weld, minimum
distance to cut the horizontal weld past the new vertical welds - answer12"
Length of shell to bottom weld that if repaired is considered either a major repair or
alteration - answer>0"
Fitness For Service – answer API 579
Low Pressure Storage Tanks – answer API 620
Risked Based Inspection - answerAPI 580
Cathodic Protection - answerAPI 651
Tank Bottom Linings - answerAPI 652
Welding on in service equipment containing flammables - answerAPI 2201
NDE Procedure Guidlines - answerASME Section V
Acceptance Standards for RT of welds - answerASME Section 8, Div. 1
Alternative evaluation for pits and LTA's - answerASME Section 8, Div. 2
Welder Qualification - answerASME Section IX
Weld Procedure Qualification - answerASME Section IX
Impact testing method and equipment requirements - answerASTM A370
Requirement for new welding electrodes - answerAWS
NDE personnel qualification (RT and UT flaw detection) - answerASNT SNT-TC-1A
API 650 Appendix for frangible roofs - answerAppendix F
API 650 Appendix for hot tanks - answerAppendix M
Maximum allowed vertical length of pits on a tank shell - answer2" in 8" Line
Max allowed length of pits in the critical zone that can be repaired by weld build up -
answer2" in 8" arc
Radial length of critical zone measured from shell - answer3"
Bottoms- suggested pad thickness - answer3-4"
, Minimum distance between clusters of surface porosity - answer4"
Minimum dimension of shell lap-patch - answer4"
Minimum radius of shell flush-patch - answer6"
When calculating tmin for shell LTA, minimum distance away from a rivet where "E" is
always 1.0 - answer6"
Minimum size of a bottom lap-patch that does NOT cross a bottom seam - answer6"
Minimum distance between a bottom lap patch and the shell for patches that do NOT
extend to the shell - answer6"
If reusing shell plates, minimum distance to cut from existing shell welds (if plates are
not deseamed) - answer6"
Minimum diagnostic length of RT for vertical or horizontal welds - answer6"
Minimum length of RT when qualifying a welder with RT using a coupon or 1st
production weld - answer6"
Minimum length of RT when qualifying a weld operator with a test coupon - answer6"
Minimum distance to overlap a shell weld when using a lap patch - answer6"
Area to dig when checking for soil-to-air corrosion - answer6-12"
Typical size of a vacuum box - answer6"X30"
Minimum dimension of a shell flush patch - answer12" or 12 times thickness of
replacement plate, whichever is greater
Bottoms-minimum distance a 3 lap joint can be from: other 3 lap joints, the shell or
annular plate joints - answer12"
Minimum dimension of bottom lap patch that crosses a bottom seam - answer12"
Foundations- suggested height above grade for new tank bottoms - answer12"
When adding a shell flush patch that extends to a horizontal shell weld, minimum
distance to cut the horizontal weld past the new vertical welds - answer12"
Length of shell to bottom weld that if repaired is considered either a major repair or
alteration - answer>0"
