understanding apiicp653 reading 9 worksheet-04

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Understandings API ICP653

Reading 9 - Q&A PracticesWork Sheet 04API653,Q&A

31st January 2016

Charlie Chong/ Fion Zhang


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Tank Farms



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Charlie Chong/ Fion Zhang http://allhotkeys.com/adobe_acrobat_reader_hotkeys.html


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http://help.adobe.com/en_US/acrobat/using/WS58a04a822e3e50102bd615109794195ff-7aed.w.htmlCharlie Chong/ Fion Zhang


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Fion Zhang at Shanghai

31st January 2016



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API 653 Exam Administration -- Publications

Effectivity Sheet FOR: November 2015, March2016 and July 2016Listed below are the effective editions of the publications required for thisexam for the date(s) shown above.

API Recommended Practice 571, Damage Mechanisms Affecting Fixed Equipment inthe Refining Industry, Second Edition, April 2011



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API 653 Exam Administration -- Publications

Effectivity Sheet FOR: November 2015, March2016 and July 2016Listed below are the effective editions of the publications required for thisexam for the date(s) shown above.

API Recommended Practice 571, Damage Mechanisms Affecting Fixed Equipment inthe Refining Industry, Second Edition, April 2011



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ATTENTION: Only the following sections / mechanisms from RP 571 areincluded on the exam:

Section 3, DefinitionsPar. 4.2.7 Brittle Fracture4.2.16 Mechanical Fatigue4.3.2 Atmospheric Corrosion

4.3.3 Corrosion Under insulation (CUI)4.3.8 Microbiologically Induced Corrosion (MIC)4.3.9 Soil Corrosion4.3.10 Caustic Corrosion4.5.1 Chloride Stress Corrosion Cracking (Cl-SCC)4.5.3 Caustic Stress Corrosion Cracking (Caustic Embrittlement)5.1.1.10 Sour Water Corrosion (Acidic)5.1.1.11 Sulfuric Acid Corrosion



11/236Charlie Chong/ Fion Zhang

API Recommended Practice 575, Inspection of Atmospheric and Low-Pressure Storage Tanks, Third Edition, April 2014

API Recommended Practice 577 Welding Inspection and Metallurgy,Second Edition, December 2013

API Standard 650, Welded Tanks for Oil Storage, Twelfth Edition, March2013 with Addendum 1 (September 2014), Errata 1 (July 2013), and

Errata 2 (December 2014). API Recommended Practice 651, Cathodic Protection of Aboveground

Petroleum Storage Tanks, Fourth Edition, September 2014. API Recommended Practice 652, Lining of Aboveground Petroleum

Storage Tank Bottoms, Fourth Edition, September 2014 API Standard 653, Tank Inspection, Repair, Alteration, and

Reconstruction, Fifth Edition, November 2014.


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American Society of Mechanical Engineers (ASME), Boiler and PressureVessel Code, 2013 Edition

i. ASME Section V, Nondestructive Examination, Articles 1, 2, 6, 7 and 23(section SE-797 only)

ii. Section IX, Welding and Brazing Qualifications (Welding Only)

See end of this study note for API Official BOK


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http://independent.academia.edu/CharlieChong1http://www.yumpu.com/zh/browse/user/charliechong

http://issuu.com/charlieccchong



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http://greekhouseoffonts.com/Charlie Chong/ Fion Zhang


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The Magical Book of Tank Inspection ICP


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API 650 PRACTICE QUESTIONSSection 1 ScopeQ1.API 650 covers the design, materials, fabrication, erection, and testing of

aboveground steel storage tanks. What is the maximum internal pressure for

tanks not covered by

appendix F of this standard?

a) Maximum pressure shall not exceed 15 psig

b) Maximum pressure shall not exceed 15 psia

c) Maximum pressure shall not exceed the weight of the roof plates

d) Maximum pressure shall not exceed the weight of the floor plates

Reference: API-650, Paragraph 1.1.1ANS:C


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Q2.API-650 applies only to tanks whose entire bottom is uniformly supported

and tanks in ___ that have a maximum operating temperature of _____F.

a) Any petrochemical service and temperature not exceeding 120

Fb) Non-refrigerated service and temperature not exceeding 200F

c) Non-refrigerated service and temperature not exceeding 120F

d) Any petrochemical service and temperature not exceeding 200F

Reference: API-650, Paragraph 1.1.1ANS:B


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Q3.An aboveground storage tank is to be subjected to a small internal

service pressure. To which standard or Code may the tank be designed?

a) API-650 providing the requirements of Appendix F are metb) API-653 providing the requirements of Appendix F are met

c) ASME-Section VIII, Div. 1 providing the requirements of Appendix F are

met

d) ASME-Section VIII, Div. 2 providing the requirements of Appendix F aremet

Reference: API-650, Paragraph 1.1.1

ANS:A


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Q4.According to Table 1-1, what is the status of Appendix O?

a) This Appendix is a Recommendation

b) This Appendix is a Requirementc) This Appendix is Mandatory

d) This Appendix is Purchasers option

Reference: API-650, Paragraph 1.1.19 and Table 1-1

ANS:D

Q5. What is the purpose of the ( ) next to a paragraph number?

a) The paragraph requires a decision or action by the API

b) The paragraph requires a decision or action by the Inspectorc) The paragraph requires a decision or action by the purchaser

d) The paragraph requires a decision or action by the fabricator

Reference: API-650, Paragraph 1.1.2 and Note

ANS:C


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Answers to API-Standard 650 Section 1, Scope


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Section 2 MaterialsQ1. API-650 lists materials to be used in the construction of tanks covered by

the standard. Is it permissible to use materials other than those listed in thestandard?

a) No only materials listed in API-650 may be used in tank fabrication

b) Yes as long as the manufacturer accepts full liability for tank failure

c) Yes providing it is certified as meeting all requirements of a material listedin API-650 and is approved by the API-653 Inspector

d) Yes providing it is certified as meeting all the requirements of a material

listed in API-650 and is approved by the purchaser

Reference: API-650, Paragraph 2.1.1ANS: D


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Q2. If a new or unused plate cannot be completely identified, may it still be

used in the construction of tanks within the scope of API-650?

a) Yes only if the material passes the tests prescribed in Appendix Sb) Yes only if the material passes the tests prescribed in Appendix N

c) Yes only if the material passes the tests prescribed in ASME Section V

d) Yes only if the material passes the tests prescribed in ASME Section VIII,

Div. 2Reference: API-650, Paragraph 2.1.2ANS:B

Q3. What is the maximum permitted underrun for shell, roof, and bottom

plates?a) 0.10 inch from the computed design thickness or minimum permitted

thickness

b) 0.01 inch from the computed design thickness or minimum permitted

thicknessc) 0.001 inch from the computed design thickness or minimum permitted

thickness

d) 0.02 inch from the computed design thickness or minimum permitted

thicknessReference: API-650, Paragraph 2.2.1.2.3ANS:B


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Q4. Shell plates are limited to what maximum thickness?

a) Shell plates are limited to a maximum thickness of 1.250 inches

b) Shell plates are limited to a maximum thickness of 1.875 inchesc) Shell plates are limited to a maximum thickness of 1.750 inches

d) Shell plates are limited to a maximum thickness of 1.075 inches

Reference: API-650, Paragraph 2.2.1.4ANS: C

Q5. Which of the following is not a requirement for shell plates that are thicker

than 1.5 inches?

a) Plates thicker than 1.5 inches shall be free of mill scale and painted

b) Plates thicker than 1.5 inches shall be made to fine-grain practicec) Plates thicker than 1.5 inches shall be impact tested

d) Plates thicker than 1.5 inches shall be normalized or quench tempered

Reference: API-650, Paragraph 2.2.1.4ANS: A


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Q6. What is the maximum shell plate thickness permitted for a tank fabricated

of ASTM A36 material?

a) This plate material is limited to 1.750 inchesb) This plate material is limited to 1.075 inches

c) This plate material is limited to 1.050 inches

d) This plate material is limited to 1.500 inches

Reference: API-650, Paragraph 2.2.2 aANS: D

Q7. What is the maximum shell plate thickness permitted for a tank fabricated

of ASTM A285, Grade C material?a) This plate material is limited to 1.000 inches

b) This plate material is limited to 1.250 inches

c) This plate material is limited to 1.500 inches

d) This plate material is limited to 1.750 inchesReference: API-650, Paragraph 2.2.2 d

ANS: A


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API650:

4.2.2 ASTM Specifications Plates that conform to the following ASTM

specifications are acceptable as long as the plates are within the statedlimitations. a) ASTM A36M/A36 for plates to a maximum thickness of 40 mm

(1.5 in.). None of the specifications for the appurtenant materials listed in

Table 1 of ASTM A36M/A36 are considered acceptable for tanks constructed

under this standard unless it is expressly stated in this standard that thespecifications are acceptable.

d) ASTM A285M/A285, Grade C, for plates to a maximum thickness of 25 mm

(1 in.).


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Q8.All welding to repair surface defects shall be done with ______.

a) Cellulose coated electrode b) High nickel content electrode

c) Low-hydrogen electrode d) Gas tungsten processReference: API-650, Paragraph 2.2.6.2

ANS:C

Q9. When conducting impact tests, how many specimens are required from asingle test coupon?

a) Impact tests shall be performed on a single specimen taken from a single

test coupon

b) Impact tests shall be performed on two specimens taken from a single testcoupon

c) Impact tests shall be performed on three specimens taken from a single

test coupon

d) Impact tests shall be performed on four specimens taken from a single testcoupon



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Q10. In situations where it is not possible to obtain full size specimens, what

is the required width along the notch for subsize specimens?

a) 60% of the material thicknessb) 80% of the material thickness

c) 90% of the material thickness

d) 75% of the material thickness

Reference: API-650, Paragraph 2.2.8.5ANS: B

Q11. Unless data is available to justify a different temperature, what must the

design metal temperature be for an aboveground storage tank to be installed

in Birmingham, Alabama?a) The design temperature shall be assumed to be 25Fb) The design temperature shall be assumed to be 15Fc) The design temperature shall be assumed to be 20F (?)

d) The design temperature shall be assumed to be 10FReference: API-650, Paragraph 2.2.9.3 and Figure 2-2ANS:?

API650


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API650:

4.2.9.5 For a plate whose thickness is insufficient to permit preparation of full-

size specimens [10 mm 10 mm (0.394 in. 0.394 in.], tests shall be madeon the largest subsize specimens that can be prepared from the plate.Subsize specimens shall have a width along the notch of at least 80 % of the

material thickness.

Figure 4.2Isothermal Lines of Lowest One-Day Mean Temperatures (F)

A L ( ti ) API St d d 650 St T k D t Sh t


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Annex L (normative)API Standard 650 Storage Tank Data Sheet

Design Metal Temperature*: Enter either lowest 1-day mean temperature plus

8 C (15 F) or a lower temperature as specified by the Purchaser if operatingconditions and/or local atmospheric conditions control fracture toughnessissues.

F

Q12 U l d t i il bl t j tif diff t t t h t t th


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Q12. Unless data is available to justify a different temperature, what must the

design metal temperature be for an aboveground storage tank to be installed

in Indianapolis, Indiana?a) The design temperature shall be assumed to be 5Fb) The design temperature shall be assumed to be -5Fc) The design temperature shall be assumed to be 0F

d) The design temperature shall be assumed to be 10FReference: API-650, Paragraph 2.2.9.3 and Figure 2-2ANS: -10F+15F=5F

Q13. What is the required average longitudinal impact value of three

specimens taken from a 1.375 inch thick A 516M-60(415) normalized GroupIIIA test coupon?

a) 30 foot-pounds

b) 20 foot-pounds

c) 15 foot-pounds

d) 13 foot-pounds

Reference: API-650, Paragraph 2.2.10.2 and Figures 2-3 and 2-4ANS: C

Annex L (normative) API Standard 650 Storage Tank Data Sheet


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Annex L (normative)API Standard 650 Storage Tank Data Sheet

Design Metal Temperature*: Enter either lowest 1-day mean temperature plus

8 C (15 F) or a lower temperature as specified by the Purchaser if operatingconditions and/or local atmospheric conditions control fracture toughnessissues.

Q14 What is the required average longitudinal impact value of three


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Q14. What is the required average longitudinal impact value of three

specimens taken from a 1.5 inch thick A 516M-70(485) as rolled Group V test

coupon?a) 35 foot-pounds

b) 25 foot-pounds

c) 20 foot-pounds

d) 30 foot-poundsReference: API-650, Paragraph 2.2.10.2 and Figures 2-3 and 2-4ANS: D

Table 4 5b Minimum Impact Test Requirements for Plates (USC) (See


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Table 4.5bMinimum Impact Test Requirements for Plates (USC) (See

Note)

Q15 Longitudinal impact tests are performed on three specimens taken from


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Q15. Longitudinal impact tests are performed on three specimens, taken from

a 1.5 inch thick A 516M-70(485) as rolled test coupon with the following

results: Specimen #1 42 foot-pounds,

Specimen #2 18 foot-pounds,

Specimen # 3 31 foot-pounds.

Is the impact test acceptable?a) Yes the average impact value exceeds 30 foot-pounds

b) Yes only one specimen is less than 2/3 the specified minimum value

c) No the average impact value of Specimen # 1 exceeds 2/3 the required

average impact value and one specimen is less than 2/3 the specified

minimum value

d) No Specimen #2 is less than 2/3 the specified minimum

Reference: API-650, Paragraph 2.2.8.3 and Figures 2-3 and 2-4ANS: D

API650:


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API650:

4.2.9.3An impact test shall be performed on three specimens taken from a

single test coupon or test location.The average value of the specimens (with no more than one specimen value

being less than the specified minimum value) shall comply with the specified

minimum value.

If more than one value is less than the specified minimum value, or if onevalue is less than two-thirds the specified minimum value, three additional

specimens shall be tested, and each of these must have a value greater than

or equal to the specified minimum value.

Answers to API-Standard 650 Section 2 Materials


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Answers to API Standard 650 Section 2, Materials

Section 3 Design


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Section 3 DesignQ1.According to API-650, tack welds _______

a) May be installed by welders who need practiceb) Can be considered as adding to the strength of a welded joint

c) Are not considered as having any strength value in the finished structure

d) Have strength value in the finished structure provided they are performed

by a qualified welder to a qualified welding procedureReference: API-650, Paragraph 3.1.3.2ANS: C

Q2. What is the minimum size fillet weld permitted when joining a 1 thick

plate to a thick plate?a) 3/16

b) 1/4

c) 3/8

d) 1/2Reference: API-650, Paragraph 3.1.3.3ANS: B, 1/3 of =

API650:


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5.1.3.3 The minimum size of fillet welds shall be as follows: On plates 5 mm

(3/16 in.) thick, the weld shall be a full- fillet weld, and on plates more than 5mm (3/16 in.) thick, the weld thickness shall not be less than one-third the

thickness of the thinner plate at the joint and shall be at least 5 mm (3/16 in.).

Q3. For lap-welded joints that are tack welded, what is the minimum amount


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p j ,

of lap permitted?

a) The lap need not exceed 2b) The lap need not exceed 1

c) The joint shall be lapped at least 5 times the minimum required thickness of

the thinner plate

d) The joint shall be lapped at least 5 times the nominal thickness of the

thinner plate

Reference: API-650, Paragraph 3.1.3.5ANS: D

Q4. The welded joint pictured here is defined as what type of joint?

a) Double-V butt joint

b) Square-groove butt joint

c) Double-U butt joint

d) Double-square butt joint


Q5. Vertical shell joints may be partial penetration groove welds welded from


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j y p p g

both sides.

a) Trueb) False

Reference: API-650, Paragraph 3.1.5.2 aANS:B

Q6.API 650 requires the vertical joints in adjacent shell courses to be offset.

What is the minimum required offset between the first course of an AST,

which is 1.25 thick and the second course which is 1 thick?

a) The minimum offset shall be 5 times the second shell course height

b) The minimum offset shall be 5 times the thickness of the second course

c) The minimum offset shall be 5 times the first shell course height

d) The minimum offset shall be 5 times the thickness of the first shell course

Reference: API-650, Paragraph 3.1.5.2 bANS: D

API650: 5.1.5.1 General


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b) Vertical joints in adjacent shell courses shall not be aligned, but shall be

offset from each other a minimum distance of 5t, where t is the platethickness of the thicker course at the point of offset.

Q7. Three-plate laps in tank bottoms shall be at least ____ from each other,


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from the tank shell, from butt-welded annular-plate joints, and from joints

between annular plates and the bottom.

a) 1.2 inches

b) 12 inches

c) 1.2 feet

d) 12 feet

Reference: API-650, Paragraph 3.1.5.4ANS:B

Q8. What is the maximum size of fillet weld permitted in the attachment

between the lowest course shell plate and the bottom plate?

a) 3/8 inch

b) 5/16 inch

c) 1/2 inch

d) 1/4 inch


Q9. What is the minimum size fillet weld required on each side of the shell


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plate attaching shell plate to the annular plate? The shell plate is 1.25 thick.

a) 3/8 inch

b) 3/16 inch

c) 1/4 inch

d) 5/16 inch


Q10.A 110 ft diameter tank shall have a top angle not less than ____ inches.

a) 2 X 2 X 3/8

b) 2 X 3 X 3/8

c) 3 X 3 X 3/8

d) 3 X 2 X 3/8


5.1.5.7 Shell-to-Bottom Fillet Welds a) For bottom and annular plates with a


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nominal thickness 13 mm (1/2 in.), and less, the attachment between the

bottom edge of the lowest course shell plate and the bottom plate shall be a

continuous fillet weld laid on each side of the shell plate. The size of each

weld shall not be more than 13 mm (1/2 in.) and shall not be less than the

nominal thickness of the thinner of the two plates joined (that is, the shell

plate or the bottom plate immediately under the shell) or less than the

following values:

b) For annular plates with a nominal thickness greater than 13 mm (1/2 in.),

th tt h t ld h ll b i d th t ith th l f th fill t ld


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the attachment welds shall be sized so that either the legs of the fillet welds or

the groove depth plus the leg of the fillet for a combined weld is of a size

equal to the annular-plate thickness (see Figure 5.3c), but shall not exceed

the shell plate thickness.

API650: 5.1.5.9 Roof and Top-Angle Joints

) E t ifi d f t t k i 5 9 f t k ith f ibl j i t


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e) Except as specified for open-top tanks in 5.9, for tanks with frangible joints

per 5.10.2.6, for self-supporting roofs in 5.10.5, and 5.10.6, and for tanks with

the flanged roof-to-shell detail described in Item f below, tank shells shall be

supplied with top angles of not less than the following sizes:

Q11. The ______ shall state the design metal temperature, the design

ifi it th i ll d th d i i d l it


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specific gravity, the corrosion allowance, and the design wind velocity.

a) The purchaser

b) The fabricator

c) The Inspector

d) Erector

Reference: API-650, Paragraph 3.2.1ANS: A

Q12.According to API-650, tanks meeting the minimum requirements of the

standard may be subjected to a partial vacuum of _____.

a) One inch of mercury

b) One inch of water pressure

c) One pound per square inch absolute

d) One centimeter of water pressure

Reference: API-650, Paragraph 3.2.4ANS: B

API650:

5 2 Design Considerations 5 2 1 Loads Loads are defined as follows


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5.2 Design Considerations 5.2.1 Loads Loads are defined as follows.

a) Dead Load (DL): The weight of the tank or tank component, including anycorrosion allowance unless otherwise noted. b)

b) Design External Pressure (Pe): Shall not be less than 0.25 kPa (1 in. of

water) except that the Design External Pressure (Pe) shall be considered

as 0 kPa (0 in. of water) for tanks with circulation vents meeting Annex H

requirements. Refer to Annex V for design external pressure greater than

0.25 kPa (1 in. of water). Requirements for design external pressure

exceeding this value and design requirements to resist flotation and

external fluid pressure shall be a matter of agreement between the

Purchaser and the Manufacturer (see Annex V). Tanks that meet the

requirements of this standard may be subjected to a partial vacuum of 0.25

kPa (1 in. of water), without the need to provide any additional supporting

calculations.

c) Design Internal Pressure (Pi): Shall not exceed 18 kPa (2.5 lbf/in.2).

Q13.An AST is 116 ft in diameter and constructed of A 516M-70(485) Group

V as rolled material How many hardness tests are required on one


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V as rolled material. How many hardness tests are required on one

circumferential weld?

a) One

b) Two

c) Three

d) Four

Reference: API-650, Paragraph 3.3.4ANS: D

Q14. The purchaser orders an aboveground storage tank and insists on a

corrosion allowance in the bottom plates of .125 inches. What is the minimum

thickness permitted for bottom plates in this tank?

a) Minimum thickness of bottom plate is 1/4 inch

b) Minimum thickness of bottom plate is 1/2 inch

c) Minimum thickness of bottom plate is 3/8 inch

d) Minimum thickness of bottom plate is 5/16 inchReference: API-650, Paragraph 3.4.1ANS: C

5.3.4 Weld Hardness

a) Weld metal and Heat Affected Zone (HAZ) hardnesses shall comply with


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a) Weld metal and Heat Affected Zone (HAZ) hardnesses shall comply with

the H2S Supplemental Specification listed on the Data Sheet, Line 5,when specified by the Purchaser.

b) When specified by the Purchaser, the hardness of the weld metal for shell

materials in Group IV, IVA, V, or VI shall be evaluated by one or both ofthe following methods.

1. The welding-procedure qualification tests for all welding shall include

hardness tests of the weld metal and heat- affected zone of the test plate.

The methods of testing and the acceptance standards shall be agreed

upon by the Purchaser and the Manufacturer.

2. All welds deposited by machine or an automatic process shall be hardness

tested on the product-side surface. Unless otherwise specified, one test

shall be conducted for each vertical weld, and one test shall be conducted

for each 30 m (100 ft) of circumferential weld. The methods of testing and

the acceptance standards shall be agreed upon by the Purchaser and theManufacturer.

Q15. What is the minimum projection, of trimmed bottom plates, beyond the

outside edge of the weld attaching bottom to the shell?


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outside edge of the weld attaching bottom to the shell?

a) Minimum projection is 0.01 inch

b) Minimum projection is 0.10 inch

c) Minimum projection is 1.00 inch

d) Minimum projection is 10.0 inch

Reference: API-650, Paragraph 3.4.2ANS: C

Q16.Annular bottom plates shall have a radial width that provides at least

____ between the inside of the shell and any lap-welded joint in the

remainder of the bottom.

a) 12 inches

b) 24 inches

c) 1.2 inches

d) 2.4 inches


Q17. How far must annular bottom plates project outside the shell?

a) Annular bottom plates shall project at least 1 inch when trimmed


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a) Annular bottom plates shall project at least 1 inch when trimmed

b) Annular bottom plates shall project at least 1/2 inch beyond the edge of theweld

c) Annular bottom plates shall project at least 2 inches outside the shell

d) Annular bottom plates shall project at least 5t (t = thickness of the shellcourse) outside the shell


Trimmed bottom plates shall project at least 1 inches

outside the shell

Annular bottom plates shall project at least 2 inchesoutside the shell

Q18. The thickness of the first shell course of an aboveground storage tank is

1 5/8th inches The hydrostatic test stress in the first shell course is 33 000


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1 5/8th inches. The hydrostatic test stress in the first shell course is 33,000

psi. What is the minimum permissible thickness of the annular bottom plates?

a) Minimum permitted thickness is 5/8th inch

b) Minimum permitted thickness is 9/16th inch

c) Minimum permitted thickness is 3/4 inch (?)

d) Minimum permitted thickness is 11/16th inch

Reference: API-650, Paragraph 3.5.3 and Table 3-1ANS: A

Q19.According to API-650, what is the minimum allowable nominal shell

thickness of an AST that is 86 feet in diameter?

a) Minimum nominal shell thickness is 3/16th inch

b) Minimum nominal shell thickness is 1/4 inch

c) Minimum nominal shell thickness is 9/32nd inch

d) Minimum nominal shell thickness is 5/16th inch


Table 5.1bAnnular Bottom-Plate Thicknesses (tb) (USC)


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Q20. Unless otherwise agreed to by the purchaser, what is the minimum

nominal width of shell plates?


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p

a) Minimum width of shell plates is 84 inches

b) Minimum width of shell plates is 96 inches

c) Minimum width of shell plates is 72 inches

d) Minimum width of shell plates is 120 inches


Q21.Aboveground storage tank manufacturers are required to furnish a

drawing to the purchaser listing all but which of the following for each course?

a) The material specification

b) The allowable stressc) The nominal thickness used

d) The nominal thickness of coatings


Q22. In calculating the net plate thickness for an AST fabricated of A 516M

Grade 450(60) material, what would be the product design stress value used


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( ) , p g

in the calculation?

a) 24,000

b) 21,300

c) 32,000

d) 23,300

Reference: API-650, Paragraph 3.6.2.1 and Table 3-2ANS: B

Q23. The fabricator of an AST obtains the approval of the purchaser to use

the alternative shell design permitted in Appendix A in the design of a 60 foot

diameter tank using 3/8th inch A 516M Grade 450(60) plate. What allowablestress would be used in the design calculations?

a) 21,300 b) 24,000 c) 21,000 d) 32,000


API650:

A.3 Design A.3.1 The maximum tensile stress before the joint efficiency


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g j y

factor is applied shall be 145 MPa (21,000 lbf/in.2).A.3.2 Stresses shall be

computed on the assumption that the tank is filled with water (specific gravity

= 1.0) or with the liquid to be stored if it is heavier than water.A.3.3 The

tension in each ring shall be computed 300 mm (12 in.) above the centerline

of the lower horizontal joint of the course in question. When these stresses

are computed, the tank diameter shall be taken as the nominal diameter of

the bottom course.

Q24. What is the maximum diameter of tank that permits the 1-foot method of

calculation for required thickness?


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a) Tanks 50 feet in diameter and less

b) Tanks 120 feet in diameter and less

c) Tanks 180 feet in diameter and less

d) Tanks 200 feet in diameter and less

Reference: API-650, Paragraph 3.6.3.1: ANS: D

Q25. Openings in tank shells, larger than that required to accommodate a

____ flanged or threaded nozzle shall be reinforced.

a) 2 inch

b) 2.5 inchc) 3 inch

d) 3.5 inch


Q26. When installing openings in a shell plate, the edge of the fillet weld

around the periphery of the reinforcing pad shall be spaced at least the


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greater of _______ from the centerline of any butt-welded shell joints.

a) Eight inches or ten times the weld size

b) Eight times the weld size or ten inches

c) Eight times the weld size or six inches

d) Eight inches or six times the weld size

Reference: API-650, Paragraph 3.7.3.1 aANS: B

Q27. When installing openings adjacent to each other, how much space must

there be between the welds around the periphery of the reinforcing plate?

a) Eight times the larger weld or ten inches from each otherb) Eight inches or six times the larger weld from each other

c) Eight times the larger weld or six inches from each other

d) Eight times the larger weld or eight inches from each other

Reference: API-650, Paragraph 3.7.3.1 bANS: C

5.7.3 Spacing of Welds around Connections

5.7.3.1 For non-stress-relieved welds on shell plates over 13 mm (1/2 in.)


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thick, the minimum spacing between penetration connections and adjacentshell-plate joints shall be governed by the following.

a) The toe of the fillet weld around a non-reinforced penetration or around the

periphery of a reinforcing plate, and the outer edge of a butt-weld around

the periphery of a thickened insert plate or insert plate, shall be spaced at

least the greater of eight times the weld size or 250 mm (10 in.) from thecenterline of any butt-welded shell joints, as illustrated in Figure 5.6,

dimensions A or B.

b) The toe of the fillet weld around a non-reinforced penetration or around the

periphery of a reinforcing plate, and the outer edge of a butt-weld aroundthe periphery of a thickened insert plate or insert plate, shall be spaced at

least the greater of eight times the larger weld size or 150 mm (6 in.) from

each other, as illustrated in Figure 5-6, dimension E.

Figure 5.6Minimum Weld Requirements for Openings in Shells

According to 5.7.3


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According to 5.7.3


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According to 5.7.3


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Q28.A minimum distance of ____ shall be maintained between the toe of a

weld around a non-reinforced penetration and the toe of the shell-to-

b tt ld


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bottom weld.

a) Ten inches b) Eight inches c) Six inches d) Three inchesReference: API-650, Paragraph 3.7.3.3ANS: D

Q29. Subject to the acceptance of the purchaser, the manufacture may locate

a circular shell opening in a horizontal butt-welded shell joint provided______.

a) Minimum spacing dimensions are met and a liquid penetrant examination

of the welded joint is conducted

b) Minimum spacing dimensions are met and a radiographic examination ofthe welded joint is conducted

c) Minimum spacing dimensions are met and an ultrasonic examination ofthe welded joint is conducted

d) Minimum spacing dimensions are met and a magnetic particle examinationof the welded joint is conducted



According to 5.7.3


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API650: 5.7.3.4 Nozzles and manholes should not be placed in shell weld

seams and reinforcing pads for nozzles and manholes should not overlap

plate seams (i e Figure 5 9 Details a c and e should be avoided) If there is


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plate seams (i.e. Figure 5.9, Details a, c, and e should be avoided). If there is

no other feasible option and the Purchaser accepts the design, circular shellopenings and reinforcing plates (if used) may be located in a horizontal or

vertical butt-welded shell joint provided that the minimum spacing dimensions

are met and a radiographic examination of the welded shell joint is conducted.

The welded shell joint shall be fully radiographed for a length equal to threetimes the diameter of the opening, but the weld seam being removed need

not be radiographed. Radiographic examination shall be in accordance with

8.1.3 through 8.1.8.

Q30.All flush-type clean-out fittings and flush-type shell connections shall be

thermally stress relieved after assembly and prior to installation in the tank.

What are the temperature range and time requirements for this stress relief


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What are the temperature range and time requirements for this stress relief

activity?a) 1100F to 1200F for 1 hour per inch of reinforcing plate thicknessb) 1100F to 1200F for 1/2 hour per inch of shell thicknessc) 1100F to 1200F for 1 hour per inch of shell thickness

d) 1100F to 1200F for 1 & 1/2 hour per inch of shell thicknessReference: API-650, Paragraph 3.7.4.1ANS: C

Q31. Subject to the acceptance of the purchaser, the fabricator may stress

relieve at a temperature of 1000F when it is impractical to stress relieve at aminimum temperature of 1100F providing _____.a) The shell plate is first pre-heated to 300Fb) The holding time is increased to 2 hours per inch of thickness

c) The holding time is increased to 4 hours per inch of thicknessd) The holding time is increased to 10 hours per inch of thickness


Q32. What is the minimum required thickness for a manhole cover plate to be

used with a 24 inch manhole? The maximum design liquid level of the tank is

45 feet


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45 feet.

a) Minimum thickness of cover plate is 9/16th inchb) Minimum thickness of cover plate is 5/8th inch

c) Minimum thickness of cover plate is 1/2 inch

d) Minimum thickness of cover plate is 11/16th inch

Reference: API-650, Paragraph 3.7.5.1 and Table 3-3ANS: A

Q33. What is the bolt circle diameter for a cover plate used with a 30 inch

diameter manhole?

a) 32 inchb) 36 inch

c) 38 inch

d) 42 inch

Reference: API-650, Paragraph 3.7.5.2 and Table 3-5ANS: B

Q34. The purchaser has ordered a 36 inch manhole to be installed in the first

course of an AST. The thickness of the shell plate and the reinforcing plate

is 1 375 inches What is the required hole diameter that must be cut in the


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is 1.375 inches. What is the required hole diameter that must be cut in the

tank to accommodate this manhole?a) 36 & 1/4 inch b) 36 & 1/2 inch c) 36 & 3/4 inch d) 36 & 5/8 inch

Reference: API-650, Paragraph 3.7.5.3 and Table 3-7ANS: C

Q35.API 650 requires telltale holes in reinforcing plates. What is the requireddimension of this hole and what should be done with it after the initial re-

pad pressure test?

a) The hole shall be 3/8 inch diameter and shall be left open to the

atmosphereb) The hole shall be 1/4 inch diameter and shall be left open to the

atmosphere

c) The hole shall be 3/8 inch diameter and shall be closed after testing

d) The hole shall be 1/4 inch diameter and shall be closed after testingReference: API-650, Paragraph 3.7.6.1ANS:

Table 5.7bDimensions for Shell Nozzles: Pipe, Plate, and Welding

Schedules (USC)


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Table 5.7bDimensions for Shell Nozzles: Pipe, Plate, and Welding

Schedules (USC)


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Q36. What is the maximum size un-reinforced opening permitted in flat cover

plates without increasing the thickness of the cover plate?

a) 4 inch pipe size providing the edge of the opening is not more than the


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a) 4 inch pipe size providing the edge of the opening is not more than the

height or diameter of the opening closer to the center of the cover plateb) 3 inch pipe size providing the edge of the opening is not more than the

height or diameter of the opening closer to the center of the cover plate

c) 2 inch pipe size providing the edge of the opening is not more than the

height or diameter of the opening closer to the center of the cover plated) 1 & inch pipe size providing the edge of the opening is not more than

the height or diameter of the opening closer to the center of the cover plate


Q37. What is the maximum size opening that may be placed in a cover plate?

a) 12 inches pipe size

b) 8 inches pipe size

c) 6 inches pipe sized) 3 inches pipe size


Q38.An aboveground storage tank has a design liquid height of 40 feet. The

purchaser intends to install product mixing equipment in the cover plate of a

30 inch manhole. What is the required minimum thickness of the cover plate?


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q p

a) The minimum thickness shall be at least .625 inchesb) The minimum thickness shall be at least .75 inches

c) The minimum thickness shall be at least .9375 inches

d) The minimum thickness shall be at least .875 inches


API650: 5.8.3 Cover Plates

A cover plate with a nozzle attachment for product-mixing equipment shall

have a thickness at least 1.4 times greater than the thickness required by


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g q y

Table 5.3a and Table 5.3b. The added thickness (or pad plate) forreplacement of the opening cutout in the cover plate shall be based on Table

5.3a and Table 5.3b. The 40 % increase in thickness within a radius of one

diameter of the opening may be included as part of the area of replacement

required. The mixer- nozzle attachment to the cover plate shall be a full-penetration weld. The manhole bolting-flange thickness shall not be less than

1.4 times the thickness required by Table 5.3a and Table 5.3b. The manhole

nozzle neck shall be designed to support the mixer forces with a minimum

thickness not less than the requirements

Table 5.3bThickness of Shell Manhole Cover Plate and Bolting Flange

(USC)


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11/16 x 1.4 x 40/43.9 = 0.877

Q39.A 24 inch manhole is to be installed in a roof plate and it is anticipated

that work may be carried on through the manhole while the tank is in use.

What is the diameter of the opening to be cut in the roof plate and what is


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the outside diameter of the reinforcing plate?a) The diameter of the opening is 24.625 and the OD of the reinforcing plate

is 42

b) The diameter of the opening is 24.625 and the OD of the reinforcing plate

is 46c) The diameter of the opening is 24.750 and the OD of the reinforcing plate

is 42

d) The diameter of the opening is 24.750 and the OD of the reinforcing plate

is 46Reference: API-650, Paragraph 3.8.4ANS: B

Figure 5.16Roof Manholes (see Table 5.13a and Table 5.13b)


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Q40. What is the minimum thickness permitted for rectangular roof opening

cover plates?

a) Minimum thickness shall not be less than .875 inches


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b) Minimum thickness shall not be less than .750 inchesc) Minimum thickness shall not be less than .625 inches

d) Minimum thickness shall not be less than .500 inches


Q41. Stiffening ring splice welds shall be located at least _____ from any

vertical shell weld.

a) 24 inches

b) 18 inchesc) 12 inches

d) 6 inches


API650: 5.9.3.4 Welds joining stiffening rings to the tank shell may cross

vertical tank seam welds. Any splice weld in the ring shall be located a

minimum of 150 mm (6 in.) from any vertical shell weld. Stiffening rings may


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also cross vertical tank seam welds with the use of coping (rat hole) of thestiffening ring at the vertical tank seam. Where the coping method is used, the

required section modulus of the stiffening ring and weld spacing must bemaintained.

Q42. When stiffening rings are to be used as walkways, what is the required

width of the stiffening ring?

a) The width shall be not less than 36 inches clear of the projecting curb


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angle on the top of the tank shellb) The width shall be not less than 3 feet 6 inches clear of the projecting curb

angle on the top of the tank shell

c) The width shall be not less than 24 inches clear of the projecting curb

angle on the top of the tank shelld) The width shall be not less than 2 feet 4 inches clear of the projecting curb

angle on the top of the tank shell


Q43. How far below the top of the curb angle should a stiffening ring, that is to

be used as a walkway, be located?

a) 3 feet 6 inches b) 36 inches c) 6 feet 3 inches d) 63 inches


API650: 5.9.4 Stiffening Rings as WalkwaysA stiffening ring or any portion

of it that is specified as a walkway shall have a width not less than 710 mm

(28 in.) clear of projections including the angle on the top of the tank shell.


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The clearance around local projections shall not be less than 610 mm (24 in.).Unless the tank is covered with a fixed roof, the stiffening ring (used as a

walkway) shall be located 1100 mm (42 in.) below the top of the curb angle

and shall be provided with a standard railing on the unprotected side and at

the ends of the section used as a walkway.

Q44.All roofs and supporting structures shall be designed to support dead

loads plus a uniform live load of not less than _____ of projected area

a) 25 pounds per square inch


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b) 25 pounds per square footc) 25 pounds per square yard

d) 25 pounds per square meter

Reference: API-650, Paragraph 3.10.2.1 ANS: B

Q45. What is the minimum nominal thickness permitted for roof plates?

a) 3/16 inch or 5.76 pounds per square foot

b) 3/16 inch or 6.75 pounds per square foot

c) 3/16 inch or 7.65 pounds per square footd) 3/16 inch or 12-gauge sheet

Reference: API-650, Paragraph 3.10.2.2 ANS: C

Q46.A roof where the continuous fillet weld between the roof plates and the

top angle does not exceed 3/16", the slope at the top angle attachment does

not exceed 2" in 12", and the shell-to-roof compression ring details are limited

t Fi F 2 ( ) (d) b id d h t t f f?


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to Figure F-2 (a)-(d) may be considered what type of roof?a) A 1 in 6 roof

b) A dangerous roof design and should be avoided

c) A roof with inherent compensation

d) A frangible roofReference API-650, Paragraph 3.10.2.5.1ANS: D

Q47. Rafters shall be spaced so that in the outer ring, their centers are not

more than _____ apart measured along the circumference of the tank.a) 3 feet or 9.42 feet b) 2 feet or 6.28 feetc) 4 feet or 12.56 feet d) 2.5 feet or 7.85 feetReference: API-650, Paragraph 3.10.4.4ANS: B

Answers to API-Standard 650 Section 3, Design


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Section 4 FabricationQ1. What method(s) is/are permitted for straightening material?

a) Pressing or other non-injurious method prior to layout or shaping

b) H ti d h i ft l t h i


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b) Heating and hammering after layout or shapingc) Jacking into shape after final assembly

d) Jacking into shape and holding with tack welds


Q2. When plates are to be butt-welded, shearing is limited to what maximum

thickness?

a) 5/8th inch

b) 3/8th inch (9.5mm)c) 3/16th inch

d) Shearing is not permitted


Q3. When plates are to be used in lap-welded joints, shearing is limited to

what maximum thickness

a) 3/16th inch b) 3/8th inch

c) 1/2 inch d) 5/8th inch (15mm)


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c) 1/2 inch d) 5/8th inch (15mm)Reference: API-650, Paragraph 4.1.2ANS: D

Q4. What are the requirements regarding mill test reports according to API-

650?a) No material shall be used in the construction of an AST unless it is

accompanied by a mill test report

b) Mill test reports are required only on shell plate material

c) Mill test reports shall be furnished to the purchaser only when specified inthe original purchase order

d) Mill test reports shall be furnished to the purchaser prior to final acceptanceof the AST


Q5. Mill and shop inspection releases the manufacturer from responsibility for

replacing defective material.

a) True

b) False


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b) FalseReference: API-650, Paragraph 4.2.2ANS: B

Answers to API-Standard 650 Section 4, Fabrication


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Section 5 ErectionQ1. What welding process is not permitted when impact testing of thematerial is required?

a) Shielded metal-arc


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a) S e ded e a a cb) Gas metal-arc

c) Oxyfuel

d) Submerged arc


Q2. Welding may be performed manually, automatically, or semi-

automatically according to the procedures described in ____ of the ASME

Code.a) Section VIII, Division 1

b) B31.3

c) Section VIII, Division 2

d) Section IXReference: API-650, Paragraph 5.2.1.1ANS: D

Q3. No welding of any kind shall be performed when the temperature of the

base metal is less than ____Fa) Sixty b) Thirty-two c) Zero d) Negative fifteen



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, g p

Q4. When base metal thickness is greater than 1.25 inches or the base metaltemperature is 0F -32F, what requirement must be met?

a) The base metal within 3 inches of the starting point of the welding shall beheated to a temperature warm to the hand (140F)b) The base metal within 3 inches of the starting point of the welding shall be

heated to a temperature of not less than 200F

c) The base metal within 3 inches of the starting point of the welding shall beheated to a temperature of not less than 60F

d) The base metal within 3 inches of the starting point of the welding shall beheated to a temperature of not less than 45F


API653: 10.4.2.3 No welding of any kind shall be performed when the

surfaces of the parts to be welded are wet from rain, snow, or ice; when rain

or snow is falling on such surfaces; or during periods of high winds unless the

welder and the work are properly shielded. No welding of any kind shall bef d h th t t f th b t l i l th 0 F Wh


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p p y g yperformed when the temperature of the base metal is less than 0 F. Whenthe temperature of the base metal is between 0 F and 32 F or the thicknessis in excess of 1 in., the base metal within 3 in. of the place where welding is

to be started shall be heated to a temperature warm to the hand(approximately 140 F) before welding. (See 10.4.4.3 for preheatrequirements for shell plates over 1 in. thick.)

10.4.4.3 For horizontal and vertical joints in tank shell courses constructed ofmaterial over 1 in. thick (based on the thickness of the thicker plate at the

joint), multi-pass weld procedures are required, with no pass more than 3/4-in.thick permitted. A minimum preheat of 200 F is required of these welds.

Q5. What is the maximum acceptable undercut for horizontal butt joints?

a) 1/64th inch

b) 1/32nd inch

c) 3/64th inchd) 3/32 d i h


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)d) 3/32nd inch


Q6. What is the maximum acceptable undercut for vertical butt joints?a) 3/32nd inch

b) 3/64th inch

c) 1/32nd inch

d) 1/64th inchReference: API-650, Paragraph 5.2.1.4ANS: D

Q7. What is the maximum permissible weld reinforcement for a vertical joint in

plate thickness 1.25?

a) 3/16th inch b) 1/8th inch c) 1/4th inch d) 3/32nd inch



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Q8. When tack welds are used during the assembly of vertical joints, whatrequirement is stipulated by API-650?

a) Tack welds that are to be removed do not require a qualified procedure orwelder

b) Tack welds that are to be left in place shall be made using a qualified

procedure only

c) Tack welds that are to be removed may be made using a welder in trainingd) Tack welds that are to be left in place shall be made using a qualified

procedure and welder


API650: 8.1.3.4 The finished surface of the weld reinforcement at the location

of the radiograph shall either be flush with the plate or have a reasonably

uniform crown not to exceed the following values:


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API653: Table 10.1Maximum Thicknesses on New Welds


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Q9. What is the requirement when protective coatings are used on surfaces

to be welded?

a) The coating must be removed prior to welding

b) The coating shall be included in the welders performance qualificationtests


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tests

c) The coating shall be included in the welding procedure qualification

d) The coating shall be identified on the purchase order


Q10. The welding of the ____ shall be practically complete prior to welding-

out the bottom joints.

a) Nozzle reinforcement periphery weldsb) Shell-to-bottom weld

c) All vertical and horizontal shell welds

d) All external attachment welds


Q11. In a vertical joint of an AST, what is the maximum misalignment of 1.5

thick plate?

a) Maximum misalignment is .150 inch

b) Maximum misalignment is .145 inchc) Maximum misalignment is 135 inch


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c) Maximum misalignment is .135 inch

d) Maximum misalignment is .125 inch

Reference: API-650, Paragraph 5.2.3.1ANS: D (10% of 1.5 or 1/8, max)

Q12. In a horizontal joint of an AST, what is the maximum projection of an

upper plate beyond the face of the plate below it? The plate thickness is .25

inch.

a) Maximum projection is .0625 inchb) Maximum projection is .0500 inch

c) Maximum projection is .1250 inch

d) Maximum projection is .09375 inch

Reference: API-650, Paragraph 5.2.3.2ANS: A, for t


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maximum of 1/8 in. Misalignment in joints 5/8 in. thick or less shall not exceed

1/16 in. Vertical joints shall be completed before the lower horizontal weld ismade.

10.4.4.2 In completed horizontal butt joints, the upper plate shall not projectbeyond the face of the lower plate at any point by more than 20 % of the

thickness of the upper plate, with a maximum projection of 1/8 in., except that

a projection of 1/16 in. is acceptable for upper plates less than 5/16-in. thick.

10.4.4.3 For horizontal and vertical joints in tank shell courses constructed ofmaterial over 1 1/2-in. thick (based on the thickness of the thicker plate at the

joint), multi-pass weld procedures are required, with no pass more than 3/4-in.thick permitted. A minimum preheat of 200 F is required of these welds.

Q13. Multi-pass weld procedures are required for circumferential and vertical

joints in tank shell courses constructed of material that is more than 1.5

inches thick. What is the maximum weld pass size permitted and what is the

minimum pre-heat temperature?a) No weld pass over inch with a minimum pre-heat of 300F


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a) No weld pass over inch with a minimum pre heat of 300 F

b) No weld pass over inch with a minimum pre-heat of 200Fc) No weld pass over inch with a minimum pre-heat of 200F

d) No weld pass over inch with a minimum pre-heat of 300FReference: API-650, Paragraph 5.2.3.4ANS: C

10.4.4.3 For horizontal and vertical joints in tank shell courses constructed of

material over 1 1/2-in. thick (based on the thickness of the thicker plate at thejoint), multi-pass weld procedures are required, with no pass more than

3/4-in. thick permitted. A minimum preheat of 200 F is required of thesewelds.

Q14. The initial weld pass inside the shell of the shell-to-bottom weld shall be

cleaned and examined for its entire circumference. This examination shall be

visually and by which of the following?

a) Magnetic particle or ultrasonic or suitable liquid penetrant processb) Magnetic particle or suitable liquid penetrant process or a vacuum box and


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b) Magnetic particle or suitable liquid penetrant process or a vacuum box and

bubble method

c) Magnetic particle or radiography or vacuum box and bubble method

d) Magnetic particle or acoustic emission or eddy currentReference: API-650, Paragraph 5.2.4.1ANS: B

Q15. The required examination of the initial weld pass as described in API-

650 may be waived subject to agreement between the purchaser and the

AST manufacturer provided all but which of the following examinations are

performed on the entire circumference of the weld(s)a) Examine either side of the finished weld by MT, PT, or right angle vacuum


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) y , , g g

box

b) Visually examine the initial weld (inside and outside)

c) Visually examine the finished joint welded surfaces (inside and outside theshell)

d) Examine either side of the finished weld by MT, PT, UT, or RT


Q16. What are the dimensions of a standard vacuum testing box?

a) 6 wide by 30 long

b) 6 wide by 24 long

c) 6 wide by 36 longd) 6 wide by 32 long


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) y g


Q17. In an examination of a tanks bottom weld seams by vacuum box testing,what is the required partial vacuum pressure?

a) At least 1 lbf/in2 gauge (psig)

b) At least 2 lbf/in2 gauge (psig)

c) At least 3 lbf/in2

gauge (psig)d) At least 4 lbf/in2 gauge (psig)


Q18. If an alternative to vacuum box testing is used, whose approval is

required?

a) The Manufacturer

b) The API-653 Inspectorc) The local jurisdiction


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) j

d) The purchaser


Q19.After fabrication is completed but prior to filling an aboveground storage

tank with test water, reinforcing plates shall be tested. What method of test

and pressure shall be used?

a) A hydrostatic pressure test at up to 15 lbf/in2

(psig)b) A pneumatic pressure test at up to 15 lbf/in2 (psig)

c) A vacuum test at a partial pressure of 2 lbf/in2 (psig)

d) A pneumatic pressure test at up to 25 lbf/in2 (psig)


Q20.A new aboveground storage tank must be tested. If water is available for

testing the shell, the tank shall be filled to any of the following levels except?

a) To the maximum design liquid level

b) Tanks with tight roofs, to 2 inches above the weld connecting the roof plateof compression bar to the top angle of the shell


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c) To overflowing to ensure all air is vented from the tank

d) To a level lower than specified in a) or b) when restricted by overflows or

freeboard agreement between the manufacturer and the purchaserReference: API-650, Paragraph 5.3.6ANS: C

API650: 7.3.5 Testing of the ShellAfter the entire tank and roof structure is

completed, the shell (except for the shell of tanks designed in accordance with

Annex F) shall be tested by one of the following methods, as specified on the Data

Sheet, Line 14. 1) If water is available for testing the shell, the tank shall be filled

with water as follows:

(1) to the maximum design liquid level H;


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(1) to the maximum design liquid level, H;

(2) for a tank with a tight roof, to 50 mm (2 in.) above the weld connecting the roof

plate or compression bar to the top angle or shell;

(3) to a level lower than that specified in Sub-item 1 or 2 when restricted by overflows,an internal floating roof, or other freeboard by agreement between the Purchaser

and the Manufacturer, or

(4) to a level of seawater producing a bottom of shell hoop stress equal to that

produced by a full-height fresh water test.

The tank shall be inspected frequently during the filling operation, and any welded

joints above the test-water level shall be examined in accordance with Item 2 below.

This test shall be conducted before permanent external piping is connected to the tank.

Attachments to the shell defined in 5.8.1.1, located at least 1 m (3 ft) above the waterlevel, and roof appurtenances may be welded during the filling of the tank. After

completion of the hydro-test, only non-structural small attachments may be welded to

the tank in accordance with 7.2.1.11.

Q21. The purchaser of an AST that is designed to be gas tight required the

roof to be tested pneumatically. What maximum pressure would be applied to

a tank with thick roof plates?

a) The maximum pneumatic pressure permitted is .053 psib) The maximum pneumatic pressure permitted is .071 psi


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c) The maximum pneumatic pressure permitted is .083 psi

d) The maximum pneumatic pressure permitted is .091 psi

Reference: API-650, Paragraph 5.3.7.1 and 3.10.2.2Solution: 3/16 thick plate = 7.65 lb/ft 1/16 = 2.55 lb/ftANS: B

API650: 7.3.7 Testing of the Roof 7.3.7.1 Upon completion, the roof of a

tank designed to be gas-tight (except for roofs designed under 7.3.7.2, F.4.4,

and E.7.5) shall be tested by one of the following methods. a) Applying

internal air pressure not exceeding the weight of the roof plates and applyingto the weld joints a bubble solution or other material suitable for the detection


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of leaks. b) Vacuum testing the weld joints in accordance with 8.6 to detect

any leaks. 7.3.7.2 Upon completion, the roof of a tank not designed to be gas-

tight, such as a tank with peripheral circulation vents or a tank with free oropen vents, shall receive only visual examination of its weld joints, unless

otherwise specified by the Purchaser.

Q22. During the filling of an aboveground storage tank for testing, leakage

was observed in a horizontal seam. Repairs are to be completed with the test

water in the tank. The tank is 61 feet high and the leak is discovered 29 feet

below the top of the tank. Where must the water level be during the repair?a) The water level shall be not less than 30 feet from the top of the tank

b) Th t l l h ll b t th 32 f t f th b tt f th t k


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b) The water level shall be not more than 32 feet from the bottom of the tank

c) The water level shall be at the maximum design liquid level

d) The water shall be removed from the tankReference: API-650, Paragraph 5.4.4ANS:A, 61-29=32, answer The water

level shall be more than 31 feet from the top of the tank

API650: 7.4.4 Repairs of defects discovered after the tank has been filled with waterfor testing shall be made with the water level at least 0.3 m (1 ft) below any point being

repaired or, if repairs have to be made on or near the tank bottom, with the tank empty.

Welding shall not be done on any tank unless all connecting lines have been

completely blinded. Repairs shall not be attempted on a tank that is filled with oil or

that has contained oil until the tank has been emptied, cleaned, and gas freed.Repairs on a tank that has contained oil shall not be attempted by the Manufacturer

unless the manner of repair has been approved in writing by the Purchaser and the

repairs are made in the presence of the Purchasers inspector.

Q23.A 60 foot high aboveground storage tank is designed with an internal

floating roof. What is the maximum out-of-plumbness permitted on the 54.5

foot fixed roof columns?

a) 2.94 inchesb) 3.27 inches

) 1 31 i h


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c) 1.31 inches

d) 1.18 inches

Reference: API-650, Paragraph 5.5.2ANS:B/ 57.5x12/200 = 3.27, smallerthan 5

Q24. What is the maximum roundness tolerance (radius tolerance) permitted

on an AST that is 110 feet in diameter and where is this tolerance applied?a) measured 10 feet above the bottom corner weld

b) measured 1 foot below the top shell angle joint

c) measured 1 foot above the bottom corner weld

d) measured 10 feet below the top shell angle jointReference: API-650, Paragraph 5.5.3ANS: C

7.5.2 Plumbness a) The maximum out-of-plumbness of the top of the shell

relative to the bottom of the shell shall not exceed 1/200 of the total tank

height. The out-of-plumbness in one shell course shall not exceed the

permissible variations for flatness and waviness as specified in ASTMA6M/A6, ASTM A20M/A20, or ASTM A480M/A480, whichever is applicable. b)

The ma im m o t of pl mbness of roof col mns g ide poles or other


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The maximum out-of-plumbness of roof columns, guide poles, or other

vertical internal components shall not exceed 1/200 of the total height. The

1/200 criteria shall also apply to fixed roof columns. For tanks with internalfloating roofs, apply the criteria of this section or Annex H, whichever is more

stringent.

H.4.5 Roof Penetrations Columns, ladders, and other rigid verticalappurtenances that penetrate the deck shall be provided with a seal that will

permit a local deviation of 125 mm (5 in.). Appurtenances shall be plumbwithin a tolerance of 75 mm (3 in.).

7.5.3 Roundness Radii measured at 0.3 m (1 ft) above the bottom corner

weld shall not exceed the following tolerances:


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Q25. Peaking at vertical welds and banding at horizontal welds shall not

exceed ____.

a) 1 inch b) inch c) inch d) inch

Reference: API-650, Paragraph 5.5.4 (a and b)ANS: C

Q26 Peaking and banding are determined using a horizontal sweep board for


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Q26. Peaking and banding are determined using a horizontal sweep board for

peaking and a straight edge vertical sweep board for banding. What is the

required length of thesesweep boards?

a) 48 inches

b) 24 inches

c) 42 inchesd) 36 inches

Reference: API-650, Paragraph 5.5.4 (a and b)ANS: D

API650: 7.5.4 Local Deviations Local deviations from the theoretical shape (for

example, weld discontinuities and flat spots) shall be limited as follows.

a) Deviations (peaking) at vertical weld joints shall not exceed 13 mm (1/2 in.).

Peaking at vertical weld joints shall be determined using a horizontal sweep board

900 mm (36 in.) long. The sweep board shall be made to the nominal radius of the

tank.


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b) Deviations (banding) at horizontal weld joints shall not exceed 13 mm (1/2 in.).

Banding at horizontal weld joints shall be determined using a straight edge vertical

sweep board 900 mm (36 in.) long.c) Flat spots measured in the vertical plane shall not exceed the appropriate plate

flatness and waviness requirements given in 7.5.2.

API563: 10.5.4 Peaking

With a horizontal sweep board 36-in. long, peaking shall not exceed 1/2 in. The sweep

board shall be made to the true outside radius of the tank.

API563: 10.5.5 Banding

With a vertical sweep board 36-in. long, banding shall not exceed 1 in.

Horizontal Peaking Board, peaking of vertical weld.

Vertical Banding Board, banding of horizontal weld.


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Charlie Chong/ Fion Zhang http://www.naehss.org/PastSchools/2011/LargeTankStorageIntegrity.pdf

Q27. The top of the concrete ringwall (where installed) of an AST must be

level within 1/8 in any 30 feet of circumference. What is the totalcircumferential tolerance measured from the average elevation?

a) 1/8 b) 3/16 c) 1/2 d) 1/4Reference API-650, Paragraph 5.5.5.2 (a)ANS: D


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Q28. Where a concrete ringwall is not provided, the foundation under the

shell shall be level to within what tolerances?a) 1/8 in any 30 of the circumference and 1/2 in the total circumferencemeasured from the average elevation

b) 1/8 in any 10 of the circumference and 1/2 in the total circumference

measured from the average elevationc) 1/8 in any 10 of the circumference and 1/4 in the total circumferencemeasured from the average elevation

d) 1/8 in any 30 of the circumference and 1/4 in the total circumference

measured from the average elevationReference API-650, Paragraph 5.5.5.2 (b)ANS: B

Q29. For foundations specified to be sloped from a horizontal plane, the

actual elevation shall not deviate from the calculated differences by more than

which of the following where concrete ringwalls are provided?

a) 1/8 in any 30 of the circumference and 1/4 in the total circumferencemeasured from the average elevationb) 1/8 in any 10 of the circumference and 1/2 in the total circumference


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b) 1/8 in any 10 of the circumference and 1/2 in the total circumferencec) 1/8 in any 10 of the circumference and 1/2 in the total circumference

measured from the average elevationd) 1/8 in any 30 of the circumference and 1/4 in the total circumferenceReference API-650, Paragraph 5.5.5.3 (a)ANS: D

Q30. For foundations specified to be sloped from a horizontal plane, the

actual elevation shall not deviate from the calculated differences by more

than which of the following where concrete ringwalls are not provided?

a) 1/8 in any 30 of the circumference and 1/2 in the total circumferencemeasured from the average elevationb) 1/8 in any 10 of the circumference and 1/2 in the total circumference


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b) 1/8 in any 10 of the circumference and 1/2 in the total circumferencec) 1/8 in any 10 of the circumference and 1/4 in the total circumference

measured from the average elevationd) 1/8 in any 30 of the circumference and 1/4 in the total circumferenceReference API-650, Paragraph 5.5.5.3 (b)ANS: B

Answers to API-Standard 650 Section 5, Erection


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Section 6 Methods of inspecting JointsQ1. With regards to radiographic examination of welded joints, API-650

considers plates to be the same thickness when the difference in their

specified or design thickness is not greater than ____.a) 1/32nd inch

b) 1/16th inch


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b) 1/16th inch

c) 3/32nd inch

d) 1/8th inchReference: API-650, Paragraph 6.1ANS: D

API650: 8.1 Radiographic Method

For the purposes of this paragraph, plates shall be considered of the samethickness when the difference in their specified or design thickness does not

exceed 3 mm (1/8 in.).

Q2. Which of the following joints do not require radiographic examination?

a) Bottom-plate welds

b) Shell butt welds

c) Flush-type connections with butt weldsd) Annular-plate butt welds



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g p

Q3. Vertical butt welds in plates not greater than 3/8th inch thick, require onespot radiograph to be taken in the first _____ of completed vertical joint of

each type and thickness by each welder or welding operator.

a) 100 feet

b) 50 feetc) 25 feet

d) 10 feet

Reference: API-650, Paragraph 6.1.2.2(a)ANS: D

Q4. One additional spot radiograph shall be taken in each additional ____ of

vertical joint of

the same type and thickness.

a) 10 feetb) 200 feet

c) 100 feet


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d) 25 feet

Reference: API-650, Paragraph 6.1.2.2(a)ANS: C

Q5. What percentage of the selected spot radiographs must be at junctions of

vertical and horizontal welded joints?

a) 25 percentb) 50 percent

c) 75 percent

d) 15 percent

Reference: API-650, Paragraph 6.1.2.2(a)ANS: A

Q6. For butt welded joints in plates over 3/8 to not over 1 in thickness are

required to be radiographically examined to the same extent as plates 3/8

and less. What additional spot examination does API-650 require for these

welded joints?a) 50 percent of all vertical and horizontal junctions

b) 75 percent of all vertical and horizontal junctions


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c) 100 percent of all vertical and horizontal junctions

d) 25 percent of all horizontal joints between the first and second courseReference: API-650, Paragraph 6.1.2.2(b)ANS: C

Q7. The radiographic film for all junctions of vertical and horizontal joints shall

show at least ____ of weld length on each side of the vertical intersection.a) 3 inches

b) 2 inches

c) 1 inch

d) 4 inches

Reference: API-650, Paragraph 6.1.2.2(b) and (c)ANS: B

API650: 8.1.2.2

b) For butt-welded joints in which the thinner shell plate is greater than 10 mm

(3/8 in.) but less than or equal to 25 mm (1 in.) in thickness, spot radiographs

shall be taken according to Item a. In addition, all junctions of vertical andhorizontal joints in plates in this thickness range shall be radiographed; each

film shall clearly show not less than 75 mm (3 in.) of vertical weld and 50 mm


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(2 in.) of weld length on each side of the vertical intersection. In the lowest

course, two spot radiographs shall be taken in each vertical joint: one of theradiographs shall be as close to the bottom as is practicable, and the other

shall be taken at random (see the center panel of Figure 8.1).

Q8. The butt weld around the periphery of an insert manhole or nozzle shall

be ____.

a) Completely examined by liquid penetrant methods

b) Completely examined by ultrasonic methodsc) Completely examined by magnetic particle methods

d) Completely examined by radiographic methods

f ( ) S


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Reference: API-650, Paragraph 6.1.2.2(d)ANS: D

Q9.After the initial spot radiograph in the first 10 feet of horizontal butt joint,

additional spot radiographs shall be taken at what increment?

a) One radiograph shall be taken in each additional 200 feet

b) One radiograph shall be taken in each additional 100 feet

c) One radiograph shall be taken in each additional 300 feet

d) One radiograph shall be taken in each additional 150 feet


Q10. What is the minimum weld length that must be clearly shown on each

radiograph?

a) 2 inches

b) 3 inchesc) 6 inches

d) 8 inches

R f API 650 P h 6 1 2 8 ANS C


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Q11. Personnel who perform and evaluate radiographic examinations

according to API-650 shall be qualified and certified by the manufacturer as

meeting the requirements as generally outlined in _____.

a) Level II or Level III of ASNT SNAT-TC-1B

b) Level II or Level III of ASNT SNT-TC-1B

c) Level II or Level III of ASNT SNAT-TC-1A

d) Level II or Level III of ASNT SNT-TC-1A

Reference:

understanding apiicp653 reading 9 worksheet-04

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