Stack #209351
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| Ref Doc: for "Fitness For Service" (FFS) | API 579
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| Ref Doc: for "Cathodic Protection" | API 651
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| Ref Doc: for "Tank Bottom Linings" | API 652
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| Ref Doc: "Welding On In-Service Equipment Containing Flammables" | API 2201
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| Ref Doc: "NDE Procedures Guidelines" | ASME Sect V
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| "Acceptance Standards For RT's of Welds" | ASME Sect VIII
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| "Welder Procedure Qualification" | ASME Sect IX
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| "Requirement For New Welding Electrodes" | AWS
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| NDE Personal Qualification | ASNT SNT-TC-1A
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| API 650 Appendix for Frangible Roofs | F
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| API 650 Appendix for Hot Tanks | M
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| Base metal temperature where welding is not allowed | < 0 f
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| Base metal temperature range where pre-heat to hand warm is required before welding | 0-32 f
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| Minimum temperature above the dew point when performing abrasive blasting for tank bottom linings | 5 f
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| Minimum temperature above dew point when installing tank bottom linings | 5 f
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| Standard temperature range for vacuum testing examination | 40-125 f
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| Standard temperature range for PT examination | 50-125 f
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| Minimum tank metal temperature where brittle fracture is not a concern | 60 f
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| Metal temperature where lap-patches are not allowed in the critical zone on a SS tank | >100 f
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| Approximate temperature of a required hand warm pre-heat | 140 f
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| Temperature when caustic corrosion becomes aggressive | >150 f
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| Required pre-heat temperature for shell welds over 1.5" thick | 200 f
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| Metal temperature where lap-patches are not allowed in the critical zone on Carbon steel tanks | > 200 f
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| Operation temperature where tanks must meet requirements of API 650 App M | > 200 f
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| Most aggressive temperature range for CUI | 212-250 F (571)
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| Maximum operation temperature allowed per requirements of API 650 App M | 500 f
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| Maximum temperature for UT readings | 1000 f
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| Maximum internal pressure for tanks included in scope of API 653 | 2.5 psig
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| Normal vacuum required when vacuum testing with a vacuum box | 3-5 psig
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| Pressure used when pneumatically testing the shell-to-bottom weld | 15 psig
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| Pressure used when pneumatically testing a repad | 15 psig
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| Maximum internal pressure included in the scope of API 620 tanks | 15 psig
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| Maximum thickness of a thin film lining | 0.020"
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| Minimum allowed bottom plate thickness when the bottom has a reinforced liner which is at least 0.050" thick | 0.050"
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| Minimum allowed bottom plate thickness when the bottom has a means to detect and contain a leak | 0.050"
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| Minimum allow average thickness of a corroded roof plate | 0.090" (in) 100 in sq (2)
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| Minimum arbitrary shell thickness (only used when the calculated minimum thickness is below this number) | 0.100"
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| Minimum allowed thickness of bottom plate projection at toe of shell-to-bottom fillet weld on an existing tank | 0.100"
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| Minimum allowed bottom plate thickness | 0.100"
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| Minimum allowed plate thickness in the critical zone which can be repaired by weld-buildup | 0.100"
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| Minimum allowed roof rim thickness | 0.100"
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| Minimum thickness of a new roof plate | 3/16"
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| Minimum thickness of a new roof rim | 3/16"
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| Normal minimum thickness of a new bottom plate | 1/4"
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| Maximum plate thickness of a lap-patch in the critical zone | 1/4"
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| Maximum tank thickness where brittle fracture is not a concern | 1/2"
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| Maximum plate thickness allowed for a shell lap-patch | 1/2"
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| Maximum shell course thickness where lap-patches are allowed | 1/2"
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| When welding existing shell plate what is the plate thickness which requires 100% examination by RT and either MT or PT? | > 1"
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| What plate thickness requires 100% of vertical welds to be RT'ed during fabrication? | > 1"
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| What shell plate thickness requires all welds to be pre-heated to at least 200 f? | > 1-1/2"
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| What is the dimension of the shell-to-bottom weld if the repair or replacement is considered either a major repair or an alteration? | > 0"
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| Typically anchor profile of steel surface required for the installation of a tank bottom lining | 1.5-4.0 mils
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| Maximum allowed undercut of a vertical weld | 1/64"
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| Maximum allowed undercut of a horizontal weld | 1/32"
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| Maximum diameter of a cluster of surface porosity in a new weld | 3/32"
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| Maximum allowed size of open discontinuity in a bend test | 1/8"
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| Minimum external projection of a bottom plate on an existing tank (measured from toe of shell-to-bottom fillet weld) | 3/8"
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| Maximum amount of peaking allowed in a reconstructed tank | 1/2"
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| When calculating (tmin) for a corroded shell area, what is the minimum distance away from a weld where (E) can always be considered 1.0. | > 1" (or) 2t
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| Minimum overlap of a shell lap-patch used to cover a hole (edge of hole to edge of patch) | 1"
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| Minimum distance beyond the area to be examined to clean a part when performing a PT examination | 1"
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| Minimum distance beyond the area to be cleaned a part when performing a MT examination | 1"
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| Maximum amount of banding allowed in a reconstructed tank | 1"
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| Minimum external projection of a bottom plate on a new tank | 2"
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| Minimum overlap required for single-welded lap joints | 2"
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| Minimum external projection of an annular plate on a new tank | 2"
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| Minimum overlap of previously tested surfaces when using a vacuum box | 2"
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| Minimum overlap of bottom lap-patch used to cover a corroded area (edge of corroded area to edge of patch) | 2"
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| Minimum distance of a fillet weld on a bottom lap patch to the nearest existing bottom weld | 2"
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| Minimum radius of a shell lap patch | 2"
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| During a tank reconstruction, what is the minimum distance to cut away from the existing bottom welds for bottom plates that will be reused? ( the bottom plates are not deseamed) | 2"
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| Maximum allowed vertical length of pits on a tank shell | 2" (in an) 8" line
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| Maximum allowed length of pits in the critical zone which can be repaired by weld build-up | 2" (in) 8"
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| Define: (tfirst)-(tint)-(tinitial)-(tbase) | Initial Thickness/First Thickness
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| Define: (tpre)-(tprevious) | Previous (prior) thickness reading
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| Define: (tlast)-(tcurrent)-(tactual) | Last Thickness most recent thickness reading
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| Define: (tretirement)-(tmin)-(tminimum) | Minimum allowed thickness
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| Radial length of the critical zone on a tank bottom measured from the shell | 3"
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| Minimum distance between clusters of surface porosity in a new weld | 4"
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| Minimum distance of a shell lap patch | 4"
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| Minimum radius of a shell flush patch | 6"
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| When calculating (tmin) for a corroded area, what is the minimum distance away from a rivet where (E) can always be considered 1.0.? | 6"
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| Minimum size of a bottom lap patch which does not not cross a bottom seam | 6"
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| Minimum distance between a bottom lap patch and the shell for patches that do not extend to the shell | 6"
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| During a tank reconstruction, the minimum distance to cut away from existing shell welds which are over 1/2" and will be reused. (welds are not deseamed) | 6"
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| Minimum diagnostic length of a RT for vertical or horizontal welds | 6"
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| Minimum length of RT when qualifying a welder with RT | 6"
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| Minimum length of RT when qualifying a welding operator with RT of a test coupon | 6"
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| Typical size of a vacuum box | 6" x 30"
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| Minimum dimension of a shell flush-patch | 12"
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| Minimum dimension that a 3-lap joint can be from: other three lap-joints, the shell, or butt welded annular joints | 12"
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| Minimum dimension of a bottom lap-patch which crosses a bottom seam | 12"
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| Suggested height above grade for new tank bottoms | 12"
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| When adding a flush-patch that extends to a horizontal shell weld, the minimum distance to cut the horizontal weld past the new vertical welds | 12"
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| Dimension of a shell flush-patch that is considered either a major repair or alteration | > 12"
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| Dimension of a shell vertical weld that if repaired or replaced is considered either a major repair or alteration | > 12"
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| Typical height that most bottom linings extend up the shell | 18-24"
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| Minimum radial width of an annular plate (distance between shell and nearest bottom fillet weld) | 24"
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| When adding a nozzle by hot tapping, the minimum height of liquid above the new nozzle during the hot tap operation | 36"
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| The minimum length of RT when qualifying a welding operator with RT of a first production weld | 36"
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| Length of sweep board used when checking for banding or peaking | 36"
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| Maximum distance between welder ID stamps on a tank weld | 36"
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| Maximum size of a shell lap-patch (vertical or horizontal dimensions) | 48"x72" (4'x6')
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| Maximum distance between tank settlement survey points across the inside of the tank | 10'
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| Maximum distance between tank settlement survey points around the outside diameter of the tank | 32'
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| Maximum distance between RT's in horizontal welds when welding to existing shell plates | 50'
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| Tank diameter when variable point design method should always be used | 200'
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| Nozzle size which never requires a repad | < 2NPS
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| Maximum pipe size for performing a RT elliptical shot (double wall technique,double wall viewing) | 3 NPS
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| Maximum nozzle size when hot tapping into a shell course greater than 1/2" thick and the shell material has unknown toughness | 4 NPS
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| Minimum nozzle size to be considered an alteration, when adding a new nozzle on an existing tank | >12 NPS
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| Minimum nozzle size to be considered a major alteration, when adding a new nozzle on a new tank | >12 NPS
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| RT film density limits of weld compared to the IQI (range) | -15 to + 30%
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| % to RT of weld intersections (new welds to old welds) on a reconstructed tank | 25%
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| Maximum relative humidity when performing abrasive blasting for tank bottom linings | 80%
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| Maximum relative humidity when installing tank bottom linings | 80%
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| % to RT of butt-welded annular plate joints on a reconstructed tank | 100%
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| % to RT when installing a new insert plate with a nozzle into an existing shell plate | 100%
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| Minimum duration of each vacuum-testing examination | 5 sec
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| Minimum time an examiner should be in a darken area prior to using a black light when performing MT and PT examinations | 5 Minutes
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| Final interpretation of a PT examination after application of developer (time range) | 10-60 minutes
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| Minimum time to let oil penetrate when performing a diesel oil test of shell-to-bottom weld | 4 hours
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| Maximum interval for checking the light intensity of a black light used in an MT or PT examination | 8 hours
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| Minimum duration for a tank hydrotest to be held at full height | 24 hours
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| Maximum interval for a routine in-service-inspection | 1 month
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| Maximum interval for a routine check of CP impressed current sources | 2 months
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| Maximum interval for calibrating a RT densitometer | 90 days
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| The maximum allowed age of the most current thickness readings which are used when designing a reconstructed tank | 180 days
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| Maximum time which a welder maintains qualifications for a welding process without using that process | 6 months
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| Maximum interval for calibrating a MT yoke | one year
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| Maximum interval for a detailed check of CP impressed current facilities | one year
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| Maximum interval for CP surveys (field potential measurements) | one year
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| Minimum time period to keep RT's acquired during tank repairs and reconstructions | one year
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| Maximum interval for UT readings for a tank shell when the corrosion rate is unknown | 5 years
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| Maximum interval for an external inspection | lesser 5 yr or 1/4 life
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| Maximum interval for an internal inspection when the corrosion rate is unknown | 10 years
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| Maximum interval for the RBI inspection | 10 year
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| Typical life for a properly applied tank lining | 10-20 years
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| Maximum interval for the UT readings of a tank shell when the corrosion rate is known | lesser 15 years or 1/2 life
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| Maximum interval for an internal inspection when the corrosion rate known | 20 years or full bttm life
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| Maximum amount of the primary seal which can be removed for repair while the tank is still in service | 1/4
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| Minimum amount of RT's required on a circular shell replacement plate | 1
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| Maximum taper (steepest slope) allowed for an insert plate | 1 to 4
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| Number of sets of center punch marks located on top and bottom edges of each shell plate that is used in a reconstruction | 2
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| Number of tension tests required to qualify a welder in welding positions 1G-4G | 2
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| Minimum number of exposures required to RT 360 <(degree) of a weld using a double-wall technique, double-wall viewing (elliptical shot) | 2
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| Minimum RT film density allowed for the weld and IQI when using a gamma ray source | 2.0
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| Minimum number of exposures required to RT 360<(degree) of a weld using a double-wall technique, single-wall viewing | 3
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| Number of test bars required in each set of impact test specimens | 3
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| When using a shim under a hole-type IQI, the number of sides of the IQI which must be seen in the RT image | 3
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| Minimum number of UT readings to take around the circumference of the location of a new hot tapped nozzle | 4
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| Number of bend tests required to qualify a WPS | 4
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| Number of bend tests required to qualify a welder in welding positions 5G and 6G | 4
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| Maximum RT film density allowed for the weld & IQI | 4.0
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| When performing corrosion averaging in a shell corroded area, the minimum number of UT readings to take on each designated vertical line | 5
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| Minimum number of RT's required on a square or rectangular shell replacement plate | 6
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| Scope of API 653 | AIRR
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| Who can be an API 653 AI's employer | JUIC
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| Who can be an API 653 repair organization | A JOC
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| Weight used to check the magnetic strength of an AC yoke | 10 lb
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| Weight used to check the magnetic strength of a DC yoke | 40 lb
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| Maximum electrical resistance permitted from tank to earth | 25 ohm
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| Minimum light intensity when performing MT or PT examinations | 100 ft-candles
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| Minimum light intensity when performing vacuum testing | 100 ft-candles
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| Minimum black light intensity when performing MT or PT examinations | 1000 micro-W/cm2 (squared)
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| Minimum allowed remaining wall thickness of a pit in a tank shell | 1/2tmin
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| Minimum offset between vertical welds in two adjacent shell courses | 5t
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| Minimum out-of-plumbness allowed a reconstructed tank | 1/100 height
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| Minimum slope on a supported roof | 3/4" (in) 12"
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| Hole size which must be visible in RT when using a hole-type IQI | 2T
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| Maximum allowed thickness on a WPS based on the plate thickness (T) for a PQR test coupon | 2T
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| Lead letter used during RT to check for backscatter radiation | B
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| Lead letter used during RT to indicate a film-side IQI | F
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| Lead letter used during RT to indicate a weld is a repaired weld | R
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| Two primary gamma-ray RT sources | Ir 192, Co 60
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| "Weld Procedure Qualification" | ASME Sect IX
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| "Welder Qualification" | ASME Sect IX
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| Number of tension tests required to qualify a WPS | 2
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