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