7030 - data sheets

API 653 Certification Data Sheets

MSTS 1 October 2013

Answer Reference Documents

1 Fitness for Service (FFS)

2 Risked Based Inspection

3 Low Pressure Storage Tanks

4 Cathodic Protection

5 Tank Bottom Linings

6 Welding on In-Service Equipment containing Flammables

7 NDE Procedure Guidelines

8 Acceptance Standards for RTs of Welds

9 Alternative evaluation for pits and LTAs

10 Welder Qualification

11 Weld Procedure Qualification

12 Impact Testing Method and Equipment Requirements

13 Requirement for new welding electrodes

14 NDE Personnel Qualification (RT & UT Flaw Detection)

15 API 650 Appendix for Frangible Roofs

16 API 650 Appendix for Hot Tanks

Answer Class Abbreviations

1 API 653 Scope (Alteration, Inspection, Repair, Reconstruction)

2 API 653 AIs Employer (Jurisdiction, User, Insurance company, Contractor)

3 API 653 Repair Organization (authorized by Jurisdiction, Owner,

Contractor)


MSTS 2 October 2013

Answer Dimensions

1 Definitions - Length of shell-to-bottom weld that if repaired is

considered a major repair or alteration

2 Linings - Typically anchor profile of steel surface required for the

installation of a tank bottom lining

3 Welds - Maximum undercut of a vertical weld & nozzle weld

4 Welds - Maximum undercut of a horizontal weld

5 Welds - Maximum diameter of a surface porosity cluster

6 Weld Qualification - Max allowed discontinuity in a Bend Test

7 Nameplates - Minimum size of nameplate letters

8 Bottoms - Minimum external projection of bottom plate on an existing

tank (from toe of shell-to-bottom FW)

9 Reconstruction - Max amount of peaking allowed in vert welds

10 Shell Calcs When calculating tmin for shell LTA, minimum distance

away from a weld where E is always 1.0

11 Shell Patch - Minimum overlap of shell lap-patch used to cover a hole

(edge of hole to edge of patch)

12 NDE - When performing a PT examination, minimum distance to clean

beyond the area to be examined

13 NDE - When performing a MT examination, minimum distance to clean

beyond the area to be examined

14 Reconstruction - Maximum amount of banding allowed in a horizontal

welds

15 Bottoms - Minimum overlap required for single-welded lap joints

16 Bottoms - Minimum external projection of bottom plate on a new tank

17 Vacuum Box - Minimum overlap of previously test surfaces when using

a vacuum box

18 Bottom Patch - Minimum overlap of bottom lap-patch used to cover

corroded area (edge of corrosion to edge of patch)

19 Bottom Patch - Minimum distance bottom lap-patch fillet weld to the

nearest existing bottom weld

20 Shell Patch - Minimum radius of a shell lap-patch

21 Reconstruction - If reusing bottom plates, min distance to cut from

existing bottom welds (if plates are not deseamed)

22 Reconstruction - If reusing roof plates, min distance to cut from

existing roof welds (if plates are not deseamed)


MSTS 3 October 2013

Answer Dimensions (continued)

23 Shell Pitting - Maximum allowed vertical length of pits on a tank shell

24 Bottom Pitting - Maximum allowed length of pits in the critical zone

that can be repaired by weld-buildup

25 Bottoms - Radial length of critical zone measured from shell

26 Bottoms Suggested pad thickness

27 Welds - Min distance between clusters of surface porosity

28 Shell Patch - Minimum dimension of a shell lap-patch

29 Shell Patch - Minimum radius of a shell flush-patch

30 Shell Calcs When calculating tmin for shell LTA, minimum distance

away from a rivet where E is always 1.0

31 Bottom Patch - Minimum size of bottom lap-patch that does NOT

cross a bottom seam

32 Bottom Patch - Minimum distance between a bottom lap-patch and the

shell for patches that do NOT extend to the shell

33 Reconstruction - If reusing shell plates, min distance to cut from

existing shell welds (if plates are not deseamed)

34 RT - Minimum diagnostic length of a RT for vertical or horizontal

welds

35 Weld Qualification - Minimum length of RT when qualifying a welder

with RT using a coupon or 1st production weld

36 Weld Qualification - Minimum length of RT when qualifying a welding

operator with RT of a test coupon

37 Shell Patch Minimum distance to overlap a shell weld when using a

lap-patch

38 Corrosion Area to dig when checking for soil-to-air corrosion

39 NDE Distance of eye-to-part to count as a Visual Exam

40 Vacuum Box - Typical size of a vacuum box

41 Shell Patch - Minimum dimension of a shell flush-patch

42 Bottoms - Minimum dimension that a 3-lap joint can be from: other 3-

laps, the shell, or annular plate joints

43 Bottom Patch - Minimum dimension of bottom lap-patch that crosses a

bottom seam

44 Foundations - Suggested height above grade for new tank bottoms


MSTS 4 October 2013

Answer Dimensions (continued)

45 Shell Patch - 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

46 Shell Patch - Dimension of a shell flush-patch that is considered

either a major repair or alteration

47 Definition - Dimension of a shell vertical weld if repaired or replaced

is considered a major repair or alteration

48 Bottom Patch Max width of bottom patch in the critical zone

49 Bottoms - Minimum radial width of annular plate (distance between

shell and nearest bottom fillet weld)

50 NDE Max distance of eye-to-part to count as a Visual Exam

51 Hot Tap - Minimum height of liquid above new nozzle during the hot

tap operation

52 Weld Qualification - Minimum length of RT when qualifying a welding

operator with RT of first production weld

53 NDE - Length of sweep board used when checking for banding or

peaking

54 Welds - Maximum distance between welder ID stamps on a tank weld

55 Shell Patch - Maximum size of shell lap-patch (vertical & horizontal

dimensions)

56 Settlement - Maximum distance between tank settlement survey

points across the inside of the tank

57 Roofs Maximum shunt spacing on floating roof

58 Settlement - Maximum distance between tank settlement survey

points around the outside diameter of the tank

59 NDE - Maximum distance between RTs in horizontal welds when

welding to existing shell plates

60 CP Typical tank size for Galvanic CP systems

61 Shell Calcs - Tank diameter when variable point design method should

always be used to calc shell minimum thickness

62 Shell Minimum offset between vertical welds in adjacent courses

63 Bottoms Minimum size of bottom welds


MSTS 5 October 2013

Answer Line Sizes

1 Repad - Nozzle size that never requires a repad

2

Repairs On existing tank, new nozzle must use insert plate if shell is

over thick and shell material does not meet current MDMT

requirements

3 RT - Maximum pipe size when using a RT elliptical shot (double-wall

technique, double-wall view)

4 Hot Tap - Maximum nozzle size that can be hot tapped when course

thickness is > and shell has unknown toughness

5 Definition - When adding a new nozzle, nozzle size to be considered a

major alteration

Answer Percentages

1 RT Film Density - Limits of weld as compared to the IQI (range)

2 AI Amount of time inspector must be involved in inspection activities

- required to maintain API 653 certification

3 RT Reconstruction - % to of weld intersections (new welds to old

welds) to be RTd

4 Maximum relative humidity when performing abrasive blasting for tank

bottom linings

5 Maximum relative humidity when installing tank bottom linings

6 % to RT when installing a new insert plate with a nozzle into an

existing shell plate

7


MSTS 6 October 2013

Answer Temperatures

1 Reconstruction - Base metal temp where welding is not allowed

2 Reconstruction - Base metal temp when hand-warm pre-heat is

required

3 Linings - Minimum temp when performing abrasive blasting

4 Linings - Minimum temp when installing tank bottom linings

5 Corrosion The corrosion rate of steel tank bottoms may double with

this rise in temperature

6 UT Calibration - Calibration Block must be within what temperature of

the part to be examined

7 Vacuum Box - Standard temperature range for VB exam

8 PT - Standard temperature range for a PT exam

9 Impact Test - Design metal temperature that requires weld procedure

used for vertical welds to be impacted tested

10 Brittle - Tank metal temperature where brittle fracture is NOT a

concern

11 Bottom Lap Patches - Metal temp where lap-patches are NOT allowed

in critical zone on SS tank

12 Intervals - If tank product solidify below this temperature, the code

maximum interval rules do not apply

13 Preheat - Approximate temp of a required hand-warm pre-heat

14 Corrosion - Temperature when high strength caustic causes serious

corrosion in CS and 300 SS

15 Preheat - Required pre-heat temperature for shell welds over 1.5

thick during Reconstruction

16 Bottom Lap Patches - Metal temperature where lap-patches are NOT

allowed in the critical zone on CS tanks

17 Temperature Range for API 650 App M

18 Corrosion - Most aggressive temperature range for CUI. Range for

API 575 and API 571

19 Preheat - Minimum pre-heat temperature, when pre-heat is

substituted for PWHT

20 Maximum temperature for UT readings

21 PWHT Temperature

22


MSTS 7 October 2013

Answer Thicknesses

1 Linings - Thickness of a thin film lining

2 Bottom - Minimum allowed bottom plate thickness when there is a

Reinforced Liner that is > 0.050 thick

3 Bottom - Minimum allowed bottom plate thickness when there is a

means to Detect and Contain a leak

4 Roofs - Minimum allowed average thickness of corroded roof plate

5 Shell - Minimum arbitrary shell thickness (used when calculated

minimum thickness is below this number)

6 Bottom - Minimum allowed thickness of bottom plate at toe of the

external shell-to-bottom fillet weld

7 Bottom - Minimum allowed bottom plate thickness away from critical

zone or an annular plate

8 Bottom - Minimum allowed plate thickness in critical zone that can

be repaired by weld-buildup

9 Roof Rim - Minimum allowed roof rim thickness

10 Roof - Minimum thickness of new roof plate (cone & floating)

11 Roof Rim - Minimum thickness of new roof rim

12 Bottom - Normal minimum thickness of new bottom plate

13 Bottom Patch - Maximum thickness of lap-patch in critical zone

14 Brittle - Thickness when brittle fracture is NOT a concern

15 Shell Patch Max shell thickness when lap-patches are allowed

16 Shell Patch Maximum patch thickness for a shell lap-patch

17 Weld Qualification When can UT be used in lieu of RT to Qualify a

Welder/Welding Operator

18 NDE - When welding existing shell plate. Thickness that requires

100% examination by RT and MT or PT.

19 NDE - Plate thickness which requires 100% of verticals weld to be

radiographed

20 Reconstruction - Shell plate thickness that requires all welds to be

preheated to at least 200 oF.

21 Shell Pits - Minimum remaining thickness allowed below a pit


MSTS 8 October 2013

Answer Time Intervals

1 Vacuum Box - Minimum duration of each vacuum-testing exam

2 NDE - Minimum time an examiner should be in a darkened area prior

to using a black light for MT & PT exams

3 NDE - Final interpretation of a PT exam after application of developer

(time range)

4 Testing - Minimum time to let oil to penetrate when performing a

diesel oil test of shell-to-bottom weld

5 Testing - Minimum duration for a tank hydrotest to be held at full

height

6 NDE - Max Calibrating Interval - Permanent magnet MT Yoke

7 Intervals - Maximum Interval - Routine In-Service inspection

8 CP - Maximum Interval - Routine check of CP impressed current

sources

9 NDE - Max Calibrating Interval - RT densitometer

10 Reconstruction - Maximum allowed age of last thickness readings,

used to design a reconstructed tank

11 Weld Qualification Maximum Time - Welder or operator maintains

qualifications for a welding process without using that process

12 NDE - Max Calibrating Interval - Electromagnetic MT Yoke

13 CP - Maximum Interval - Detailed check of CP impressed current

facilities

14 CP - Maximum Interval - CP surveys (field potential measurements)

15 NDE - Minimum Time - To keep RTs acquired during tank repairs and

reconstructions

16 Vac Box Max Test Interval - Jaeger 2 eye test for VB oper

17 NDE Max Test Interval - Jaeger 2 eye test for PT/ MT tech

18 AI Time period between API AI recertification

19 Intervals - Maximum Interval - UT readings of a tank shell when the

corrosion rate is unknown

20 Intervals - Maximum Interval - External Inspection

21 AI Time period between API AI on-line recertification

22 Intervals - Maximum Interval - Initial Internal Inspection (without

RBI or other special situations)


MSTS 9 October 2013

Answer Time Intervals (continued)

23 RBI - Maximum Interval - RBI reassessments

24 Intervals - Maximum Interval - UT readings of a tank shell when the

corrosion rate is known

25 Intervals - Maximum Interval - Internal Inspection when the

corrosion rate is known (without RBI assessment)

26 Linings - Typical life of a properly applied tank lining

27 NDE - Max Calibrating Interval - Check the light intensity of a black

light used in a MT or PT exam

Answer Pressures

1 Scope - Maximum internal pressure for tanks in API 650 & 653

2 Vacuum Box - Normal vacuum required when vacuum testing

3 Pressure Test - Pressure used when air testing the shell-to-bottom

weld

4 Pressure Test - Pressure used when air testing a repad

5 Scope - Maximum internal pressure for tanks in API 620

Answer Slopes

1 Minimum slope of normal tank bottom

2 Minimum slope of cone roof tank (for water runoff)

3 Maximum roof slope on tanks > 50 diameter (if roof is considered to

be fragible)

4 Maximum taper (steepest slope) allowed for an insert plate

5


MSTS 10 October 2013

Answer Miscellaneous Numbers

1 Roofs - Maximum amount of primary seal that can be removed for

repair while tank is still in service

2 NDE - Minimum number of RTs required on a circular shell

replacement plate

3 FFS Current joint efficiency E in API 650

4 FFS Joint Efficiency E Calculating tmin for an LTA, when LTA is

away from rivets by > 6

5 FFS Joint Efficiency E Calculating tmin for an LTA, when LTA is

away from weld by greater of: 1 or 2t

6 Reconstruction - Number of sets of center punch marks located on

top and bottom edges of each shell piece

7 Weld Qualification - Number of tension tests to qualify a WPS

8 Weld Qualification - Number of bend tests to qualify a welder or

welding operator in welding positions 1G-4G

9 NDE - Minimum # of exposures to RT 360o of a weld using a double-

wall technique, double-wall view (elliptical shot)

10 NDE - RT film Density Range - allowed for the weld & IQI when using

a gamma ray source

11 NDE - Minimum # of exposures to RT 360o of a weld using a double-

wall technique, single-wall view

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

test specimens

13 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

14 Hot Tap - Minimum number of UT readings around the circumference

of a new hot tapped nozzle

15 Weld Qualification - Number of bend tests to qualify a WPS

16 Weld Qualification - Number of bend tests required to qualify a

welder in welding positions 5G & 6G

17 FFS - Corrosion Averaging in a Shell LTA - Minimum # of UT readings

to take on each designated vertical line.

18 NDE - Minimum number of RTs required on a square or rectangular

shell replacement plate

19 Settlement - Minimum number of settlement points around

circumference

20

21

22



Answer Miscellaneous Other

1 Reconstructed Maximum allowed out-of-plumbness

2 Corrosion pH level that causes corrosion to increase

3 Corrosion Chloride level where pitting on steel begins

4 NDE - Weight used to check magnetic strength of an AC yoke

5 Grounding - Maximum electrical resistance permitted from tank to earth

6 NDE Min angle of eye-to-part to count as a Visual Exam

7 NDE - Weight used to check magnetic strength of a DC yoke

8 NDE - Minimum light intensity when performing non-fluorescent MT or PT exams

9 Vacuum Box - Minimum light intensity when performing vacuum testing

10 NDE - Minimum black light intensity when performing fluorescent MT or PT exams

11 Brittle Shell stress when brittle fracture is NOT a concern

12 NDE - Hole size that must be visible in RT when using a hole-type IQI

13 Weld Qualification - Maximum allowed thickness on a WPS based on the plate thickness (T) of a PQR test coupon

14 Weld Qualification The all-position test coupon

15 NDE - Lead letter used during RT to check for backscatter radiation

16 NDE - Lead letter used during RT to indicate a film-side IQI

17 NDE - Lead letter used during RT to indicate a repaired weld

18 Repairs Material where pre-heat can be substituted for a required PWHT

19 Repairs Materials where control deposition welding can be substituted for a required PWHT

20 Hot Taps Nozzle thickness for hot tapped nozzles



Miscellaneous Other (continued)

21 Repairs Welding processes that can be used when substituting Preheat or Controlled Deposition welding for a required PWHT

22 Corrosion In a corrosion cell, the part that corrodes

23 Corrosion In a corrosion cell, the part that doesnt corrode

24 Linings Minimum surface prep prior to applying lining

25 Weld Qualification Rejectable in RT when qualifying a welder

26