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Stack #209351

QuestionAnswer
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
Created by: johngwin