Section 3 API-650 Practice Questions

Issue Date Revision Date Page06/98 02/00

Subject API Standard 650 1

Section 1 – Scope

1. 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 psigb) Maximum pressure shall not exceed 15 psiac) Maximum pressure shall not exceed the weight of the roof platesd) Maximum pressure shall not exceed the weight of the floor plates

Reference: API-650, Paragraph 1.1.1

2. 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 120Fb) Non-refrigerated service and temperature not exceeding 200Fc) Non-refrigerated service and temperature not exceeding 120Fd) Any petrochemical service and temperature not exceeding 200F


3. 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 metc) ASME-Section VIII, Div. 1 providing the requirements of Appendix F are metd) ASME-Section VIII, Div. 2 providing the requirements of Appendix F are met


4. According to Table 1-1, what is the status of Appendix O?a) This Appendix is a Recommendationb) This Appendix is a Requirementc) This Appendix is Mandatoryd) This Appendix is Purchaser’s option

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

5. What is the purpose of the ( ) next to a paragraph number?a) The paragraph requires a decision or action by the APIb) The paragraph requires a decision or action by the Inspectorc) The paragraph requires a decision or action by the purchaserd) The paragraph requires a decision or action by the fabricator

Reference: API-650, Paragraph 1.1.2 and Note

API-653 Exam Prep Course BAY Technical Associates, Inc. (610) 594-9036



Answers to API-Standard 650 Section 1, Scope

Question Number Answer1 C2 B3 A4 D5 C

Should you find a mistake or disagree with any answer listed, please bring it to our attention for correction or clarification.

BAY Technical Associates, Inc. has attempted to provide answers developed from paragraphs of the respective Code, Standard, or Recommended Practice.

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Section 2 – Materials

1. 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 the standard?

a) No only materials listed in API-650 may be used in tank fabricationb) Yes as long as the manufacturer accepts full liability for tank failurec) Yes providing it is certified as meeting all requirements of a material listed in

API-650 and is approved by the API-653 Inspectord) Yes providing it is certified as meeting all the requirements of a material listed in

API-650 and is approved by the purchaser


2. 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 Nc) Yes only if the material passes the tests prescribed in ASME Section Vd) Yes only if the material passes the tests prescribed in ASME Section VIII, Div. 2


3. What is the maximum permitted underrun for shell, roof, and bottom plates?a) 0.10 inch from the computed design thickness or minimum permitted thicknessb) 0.01 inch from the computed design thickness or minimum permitted thicknessc) 0.001 inch from the computed design thickness or minimum permitted thicknessd) 0.02 inch from the computed design thickness or minimum permitted thickness

Reference: API-650, Paragraph 2.2.1.2.3

4. Shell plates are limited to what maximum thickness?a) Shell plates are limited to a maximum thickness of 1.250 inchesb) Shell plates are limited to a maximum thickness of 1.875 inchesc) Shell plates are limited to a maximum thickness of 1.750 inchesd) Shell plates are limited to a maximum thickness of 1.075 inches

Reference: API-650, Paragraph 2.2.1.4

5. 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 paintedb) Plates thicker than 1.5 inches shall be made to fine-grain practicec) Plates thicker than 1.5 inches shall be impact testedd) Plates thicker than 1.5 inches shall be normalized or quench tempered





6. What is the maximum shell plate thickness permitted for a tank fabricated of ASTM A 36 material?

a) This plate material is limited to 1.750 inchesb) This plate material is limited to 1.075 inchesc) This plate material is limited to 1.050 inchesd) This plate material is limited to 1.500 inches

Reference: API-650, Paragraph 2.2.2 a

7. What is the maximum shell plate thickness permitted for a tank fabricated of ASTM A 285, Grade C material?

a) This plate material is limited to 1.000 inchesb) This plate material is limited to 1.250 inchesc) This plate material is limited to 1.500 inchesd) This plate material is limited to 1.750 inches

Reference: API-650, Paragraph 2.2.2 d

8. All welding to repair surface defects shall be done with ______.a) Cellulose coated electrodeb) High nickel content electrodec) Low-hydrogen electroded) Gas tungsten process


9. When conducting impact tests, how many specimens are required from a single 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 test couponc) Impact tests shall be performed on three specimens taken from a single test

coupond) Impact tests shall be performed on four specimens taken from a single test coupon


10. 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 thicknessc) 90% of the material thicknessd) 75% of the material thickness





11. 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 20Fd) The design temperature shall be assumed to be 10F

Reference: API-650, Paragraph 2.2.9.3 and Figure 2-2

12. 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 0Fd) The design temperature shall be assumed to be 10F

Reference: API-650, Paragraph 2.2.9.3 and Figure 2-2

13. What is the required average longitudinal impact value of three specimens taken from a 1.375 inch thick A 516M-60(415) normalized Group IIIA test coupon?

a) 30 foot-poundsb) 20 foot-poundsc) 15 foot-poundsd) 13 foot-pounds

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

14. 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-poundsb) 25 foot-poundsc) 20 foot-poundsd) 30 foot-pounds


15. 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-poundsb) Yes only one specimen is less than 2/3 the specified minimum valuec) 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 valued) No Specimen #2 is less than 2/3 the specified minimum





Answers to API-Standard 650 Section 2, Materials

Question Number Answer1 D2 B3 B4 C5 A6 D7 A8 C9 C10 B11 C12 A13 C14 D15 D








Section 3 – Design

1. 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 jointc) Are not considered as having any strength value in the finished structured) Have strength value in the finished structure provided they are performed by a

qualified welder to a qualified welding procedure


2. What is the minimum size fillet weld permitted when joining a 1” thick plate to a ¾” thick plate?

a) 3/16”b) 1/4”c) 3/8”d) 1/2”


3. For lap-welded joints that are tack welded, what is the minimum amount of lap permitted?

a) The lap need not exceed 2”b) The lap need not exceed 1”c) The joint shall be lapped at least 5 times the minimum required thickness of the

thinner plated) The joint shall be lapped at least 5 times the nominal thickness of the thinner plate


4. The welded joint pictured here is defined as what type of joint?a) Double-V butt jointb) Square-groove butt jointc) Double-U butt jointd) Double-square butt joint


5. Vertical shell joints may be partial penetration groove welds welded from both sides.a) Trueb) False

Reference: API-650, Paragraph 3.1.5.2 a




6. 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 heightb) The minimum offset shall be 5 times the thickness of the second coursec) The minimum offset shall be 5 times the first shell course heightd) The minimum offset shall be 5 times the thickness of the first shell course

Reference: API-650, Paragraph 3.1.5.2 b

7. Three-plate laps in tank bottoms shall be at least ____ from each other, from the tank shell, from butt-welded annular-plate joints, and from joints between annular plates and the bottom.

a) 1.2 inchesb) 12 inchesc) 1.2 feetd) 12 feet


8. 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 inchb) 5/16 inchc) 1/2 inchd) 1/4 inch


9. What is the minimum size fillet weld required on each side of the shell plate attaching shell plate to the annular plate? The shell plate is 1.25” thick.



10. A 110 ft diameter tank shall have a top angle not less than ____ inches.a) 2 X 2 X 3/8b) 2 X 3 X 3/8 c) 3 X 3 X 3/8d) 3 X 2 X 3/8





11. The ______ shall state the design metal temperature, the design specific gravity, the corrosion allowance, and the design wind velocity.

a) The purchaserb) The fabricatorc) The Inspectord) Erector


12. According to API-650, tanks meeting the minimum requirements of the standard may be subjected to a partial vacuum of _____.

a) One inch of mercuryb) One inch of water pressurec) One pound per square inch absoluted) One centimeter of water pressure


13. 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 circumferential weld?

a) Oneb) Twoc) Threed) Four


14. 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 inchb) Minimum thickness of bottom plate is 1/2 inchc) Minimum thickness of bottom plate is 3/8 inchd) Minimum thickness of bottom plate is 5/16 inch


15. What is the minimum projection, of trimmed bottom plates, beyond the outside edge of the weld attaching bottom to the shell?

a) Minimum projection is 0.01 inchb) Minimum projection is 0.10 inchc) Minimum projection is 1.00 inchd) Minimum projection is 10.0 inch





16. 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 inchesb) 24 inchesc) 1.2 inchesd) 2.4 inches


17. How far must annular bottom plates project outside the shell?a) Annular bottom plates shall project at least 1 inch when trimmedb) Annular bottom plates shall project at least 1/2 inch beyond the edge of the weldc) Annular bottom plates shall project at least 2 inches outside the shelld) Annular bottom plates shall project at least 5t (t = thickness of the shell course)

outside the shell


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

a) Minimum permitted thickness is 5/8th inchb) Minimum permitted thickness is 9/16th inchc) Minimum permitted thickness is 3/4 inchd) Minimum permitted thickness is 11/16th inch

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

19. 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 inchb) Minimum nominal shell thickness is 1/4 inchc) Minimum nominal shell thickness is 9/32nd inchd) Minimum nominal shell thickness is 5/16th inch


20. Unless otherwise agreed to by the purchaser, what is the minimum nominal width of shell plates?

a) Minimum width of shell plates is 84 inchesb) Minimum width of shell plates is 96 inchesc) Minimum width of shell plates is 72 inchesd) Minimum width of shell plates is 120 inches





21. 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 specificationb) The allowable stressc) The nominal thickness usedd) The nominal thickness of coatings


22. 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 in the calculation?

a) 24,000b) 21,300c) 32,000d) 23,300

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

23. 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 allowable stress would be used in the design calculations?

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


24. What is the maximum diameter of tank that permits the 1-foot method of calculation for required thickness?

a) Tanks 50 feet in diameter and lessb) Tanks 120 feet in diameter and lessc) Tanks 180 feet in diameter and lessd) Tanks 200 feet in diameter and less


25. Openings in tank shells, larger than that required to accommodate a ____ flanged or threaded nozzle shall be reinforced.

a) 2 inchb) 2.5 inchc) 3 inchd) 3.5 inch





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

a) Eight inches or ten times the weld sizeb) Eight times the weld size or ten inchesc) Eight times the weld size or six inchesd) Eight inches or six times the weld size

Reference: API-650, Paragraph 3.7.3.1 a

27. 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 otherc) Eight times the larger weld or six inches from each otherd) Eight times the larger weld or eight inches from each other

Reference: API-650, Paragraph 3.7.3.1 b

28. 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-bottom weld.

a) Ten inchesb) Eight inchesc) Six inchesd) Three inches


29. 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 of the welded joint is conducted

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

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


30. 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 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 thicknessd) 1100F to 1200F for 1 & 1/2 hour per inch of shell thickness





31. 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 a minimum 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 thicknessc) The holding time is increased to 4 hours per inch of thicknessd) The holding time is increased to 10 hours per inch of thickness


32. 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.

a) Minimum thickness of cover plate is 9/16th inchb) Minimum thickness of cover plate is 5/8th inchc) Minimum thickness of cover plate is 1/2 inchd) Minimum thickness of cover plate is 11/16th inch


33. What is the bolt circle diameter for a cover plate used with a 30 inch diameter manhole?a) 32 ¾ inchb) 36 ¼ inchc) 38 ¾ inch d) 42 ¼ inch


34. 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 tank to accommodate this manhole?

a) 36 & 1/4 inchb) 36 & 1/2 inchc) 36 & 3/4 inchd) 36 & 5/8 inch


35. API 650 requires telltale holes in reinforcing plates. What is the required dimension 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 atmospherec) The hole shall be 3/8 inch diameter and shall be closed after testingd) The hole shall be 1/4 inch diameter and shall be closed after testing





36. 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 ¼ the height or diameter of the opening closer to the center of the cover plate

b) 3 inch pipe size providing the edge of the opening is not more than ¼ 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 ¼ the height or diameter of the opening closer to the center of the cover plate

d) 1 & ½ inch pipe size providing the edge of the opening is not more than ¼ the height or diameter of the opening closer to the center of the cover plate


37. What is the maximum size opening that may be placed in a cover plate?a) 12 inches pipe sizeb) 8 inches pipe sizec) 6 inches pipe sized) 3 inches pipe size


38. 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?

a) The minimum thickness shall be at least .625 inchesb) The minimum thickness shall be at least .75 inchesc) The minimum thickness shall be at least .9375 inchesd) The minimum thickness shall be at least .875 inches


39. 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 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 46”c) 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 46”


40. What is the minimum thickness permitted for rectangular roof opening cover plates?a) Minimum thickness shall not be less than .875 inchesb) Minimum thickness shall not be less than .750 inchesc) Minimum thickness shall not be less than .625 inchesd) Minimum thickness shall not be less than .500 inches





41. Stiffening ring splice welds shall be located at least _____ from any vertical shell weld.a) 24 inchesb) 18 inchesc) 12 inchesd) 6 inches


42. 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 angle on the top of the tank shell

b) 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 shell

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


43. 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 inchesb) 36 inchesc) 6 feet 3 inchesd) 63 inches


44. 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 inchb) 25 pounds per square footc) 25 pounds per square yardd) 25 pounds per square meter


45. What is the minimum nominal thickness permitted for roof plates?a) 3/16 inch or 5.76 pounds per square footb) 3/16 inch or 6.75 pounds per square footc) 3/16 inch or 7.65 pounds per square footd) 3/16 inch or 12-gauge sheet





46. 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 to Figure F-2 (a)-(d) may be considered what type of roof?

a) A 1 in 6 roofb) A dangerous roof design and should be avoidedc) A roof with inherent compensationd) A frangible roof

Reference API-650, Paragraph 3.10.2.5.1

47. 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 feetb) 2 feet or 6.28 feetc) 4 feet or 12.56 feetd) 2.5 feet or 7.85 feet


Answers to API-Standard 650 Section 3, Design

Question Number Answer1 C2 B3 D4 A5 B6 D7 B8 C9 D10 C11 A12 B13 D14 C15 C16 B17 C18 A19 B20 C21 D22 B23 C




Answers to API-Standard 650 Section 3, Design (continued)

24 D25 A26 B27 C28 D29 B30 C31 C32 A33 B34 C35 B36 C37 A38 D39 B40 D41 D42 C43 A44 B45 C46 D47 B








Section 4 – Fabrication

1. What method(s) is/are permitted for straightening material?a) Pressing or other non-injurious method prior to layout or shapingb) Heating and hammering after layout or shapingc) Jacking into shape after final assemblyd) Jacking into shape and holding with tack welds


2. When plates are to be butt-welded, shearing is limited to what maximum thickness?a) 5/8th inchb) 3/8th inchc) 3/16th inchd) Shearing is not permitted


3. When plates are to be used in lap-welded joints, shearing is limited to what maximum thickness

a) 3/16th inchb) 3/8th inchc) 1/2 inchd) 5/8th inch


4. 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 reportb) Mill test reports are required only on shell plate materialc) Mill test reports shall be furnished to the purchaser only when specified in the

original purchase orderd) Mill test reports shall be furnished to the purchaser prior to final acceptance of the

AST


5. Mill and shop inspection releases the manufacturer from responsibility for replacing defective material.

a) Trueb) False





Answers to API-Standard 650 Section 4, Fabrication

Question Number Answer1 A2 B3 D4 C5 B








Section 5 – Erection

1. What welding process is not permitted when impact testing of the material is required?a) Shielded metal-arcb) Gas metal-arcc) Oxyfueld) Submerged arc


2. Welding may be performed manually, automatically, or semi-automatically according to the procedures described in ____ of the ASME Code.

a) Section VIII, Division 1b) B31.3c) Section VIII, Division 2d) Section IX


3. No welding of any kind shall be performed when the temperature of the base metal is less than ____F

a) Sixtyb) Thirty-twoc) Zerod) Negative fifteen


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

a) The base metal within 3 inches of the starting point of the welding shall be heated to a temperature warm to the hand

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 be heated to a temperature of not less than 60F

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


5. What is the maximum acceptable undercut for horizontal butt joints?a) 1/64th inchb) 1/32nd inchc) 3/64th inchd) 3/32nd inch





6. What is the maximum acceptable undercut for vertical butt joints?a) 3/32nd inchb) 3/64th inchc) 1/32nd inchd) 1/64th inch


7. What is the maximum permissible weld reinforcement for a vertical joint in plate thickness 1.25”?

a) 3/16th inchb) 1/8th inchc) 1/4th inchd) 3/32nd inch


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

a) Tack welds that are to be removed do not require a qualified procedure or welderb) Tack welds that are to be left in place shall be made using a qualified procedure

onlyc) 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


9. What is the requirement when protective coatings are used on surfaces to be welded?a) The coating must be removed prior to weldingb) The coating shall be included in the welder’s performance qualification testsc) The coating shall be included in the welding procedure qualificationd) The coating shall be identified on the purchase order


10. The welding of the ____ shall be practically complete prior to welding-out the bottom joints.

a) Nozzle reinforcement periphery weldsb) Shell-to-bottom weldc) All vertical and horizontal shell weldsd) All external attachment welds





11. In a vertical joint of an AST, what is the maximum misalignment of 1.5” thick plate?a) Maximum misalignment is .150 inchb) Maximum misalignment is .145 inchc) Maximum misalignment is .135 inchd) Maximum misalignment is .125 inch


12. 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 inchc) Maximum projection is .1250 inchd) Maximum projection is .09375 inch


13. 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 ¾ inch with a minimum pre-heat of 300Fb) No weld pass over ½ inch with a minimum pre-heat of 200Fc) No weld pass over ¾ inch with a minimum pre-heat of 200Fd) No weld pass over ½ inch with a minimum pre-heat of 300F


14. 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 bubble

methodc) Magnetic particle or radiography or vacuum box and bubble methodd) Magnetic particle or acoustic emission or eddy current


15. 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 boxb) Visually examine the initial weld (inside and outside)c) Visually examine the finished joint welded surfaces (inside and outside the shell)d) Examine either side of the finished weld by MT, PT, UT, or RT





16. What are the dimensions of a standard vacuum testing box?a) 6” wide by 30” longb) 6” wide by 24” longc) 6” wide by 36” longd) 6” wide by 32” long


17. In an examination of a tank’s 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)


18. If an alternative to vacuum box testing is used, whose approval is required?a) The Manufacturerb) The API-653 Inspectorc) The local jurisdictiond) The purchaser


19. 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)


20. 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 levelb) Tanks with tight roofs, to 2 inches above the weld connecting the roof plate of

compression bar to the top angle of the shellc) To overflowing to ensure all air is vented from the tankd) To a level lower than specified in a) or b) when restricted by overflows or

freeboard agreement between the manufacturer and the purchaser





21. 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 ¼” thick roof plates?

a) The maximum pneumatic pressure permitted is .053 psib) The maximum pneumatic pressure permitted is .071 psic) The maximum pneumatic pressure permitted is .083 psid) 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/ft

22. 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 tankb) The water level shall be not more than 32 feet from the bottom of the tankc) The water level shall be at the maximum design liquid leveld) The water shall be removed from the tank


23. 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 inchesc) 1.31 inchesd) 1.18 inches


24. 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) ¾” measured 10 feet above the bottom corner weldb) ¾” measured 1 foot below the top shell angle jointc) ¾” measured 1 foot above the bottom corner weldd) ¾” measured 10 feet below the top shell angle joint


25. Peaking at vertical welds and banding at horizontal welds shall not exceed ____.a) 1 inchb) ¾ inchc) ½ inchd) ¼ inch

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




26. 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 these sweep boards?

a) 48 inchesb) 24 inchesc) 42 inchesd) 36 inches

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

27. 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 total circumferential tolerance measured from the average elevation?

a) 1/8”b) 3/16”c) 1/2”d) 1/4”

Reference API-650, Paragraph 5.5.5.2 (a)

28. 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 circumference measured from the average elevation

b) 1/8” in any 10’ of the circumference and 1/2” in the total circumference measured from the average elevation

c) 1/8” in any 10’ of the circumference and 1/4” in the total circumference measured from the average elevation

d) 1/8” in any 30’ of the circumference and 1/4” in the total circumference measured from the average elevation

Reference API-650, Paragraph 5.5.5.2 (b)

29. 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?


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

Reference API-650, Paragraph 5.5.5.3 (a)




30. 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?


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

Reference API-650, Paragraph 5.5.5.3 (b)

Answers to API-Standard 650 Section 5, Erection

Question Number Answer Question Number Answer1 C 16 A2 D 17 C3 C 18 D4 A 19 B5 B 20 C6 D 21 B7 A 22 A8 D 23 B9 C 24 C10 B 25 C11 D 26 D12 A 27 D13 C 28 B14 B 29 D15 D 30 B








Section 6 – Methods of inspecting Joints

1. 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 inchb) 1/16th inchc) 3/32nd inchd) 1/8th inch

Reference: API-650, Paragraph 6.1

2. Which of the following joints do not require radiographic examination?a) Bottom-plate weldsb) Shell butt weldsc) Flush-type connections with butt weldsd) Annular-plate butt welds


3. Vertical butt welds in plates not greater than 3/8th inch thick, require one spot radiograph to be taken in the first _____ of completed vertical joint of each type and thickness by each welder or welding operator.

a) 100 feetb) 50 feetc) 25 feetd) 10 feet

Reference: API-650, Paragraph 6.1.2.2(a)

4. One additional spot radiograph shall be taken in each additional ____ of vertical joint of the same type and thickness.



5. What percentage of the selected spot radiographs must be at junctions of vertical and horizontal welded joints?

a) 25 percentb) 50 percentc) 75 percentd) 15 percent





6. 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 junctionsb) 75 percent of all vertical and horizontal junctionsc) 100 percent of all vertical and horizontal junctionsd) 25 percent of all horizontal joints between the first and second course

Reference: API-650, Paragraph 6.1.2.2(b)

7. 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 inchesb) 2 inchesc) 1 inchd) 4 inches

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

8. The butt weld around the periphery of an insert manhole or nozzle shall be ____.a) Completely examined by liquid penetrant methodsb) Completely examined by ultrasonic methodsc) Completely examined by magnetic particle methodsd) Completely examined by radiographic methods

Reference: API-650, Paragraph 6.1.2.2(d)

9. 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 feetb) One radiograph shall be taken in each additional 100 feetc) One radiograph shall be taken in each additional 300 feetd) One radiograph shall be taken in each additional 150 feet


10. What is the minimum weld length that must be clearly shown on each radiograph?a) 2 inchesb) 3 inchesc) 6 inchesd) 8 inches





11. 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-1Bb) Level II or Level III of ASNT SNT-TC-1Bc) Level II or Level III of ASNT SNAT-TC-1Ad) Level II or Level III of ASNT SNT-TC-1A


12. The acceptance standards for radiographic examinations shall be in accordance with which of the following?

a) Paragraph UW-51(b) in Section VIII of the ASME Codeb) Paragraph PW-51(b) in Section I of the ASME Codec) Paragraph 341.3.2 in B31.3 Process Piping of the ASME Coded) Paragraph RB-3233 in the National Board Inspection Code (NBIC)


13. If a section of weld is shown by a radiograph to be unacceptable under the provisions of API-650, paragraph 6.1.5 or the radiograph does not define the limits of the deficient welding, which of the following requirements apply?

a) One additional spot shall be taken and at least 3” of weld shall be representedb) Two spots adjacent to the section shall be examined by radiographyc) Two spots ten feet from each side of the original radiography shall be examinedd) Two spots, chosen randomly by the purchaser’s inspector, shall be examined by

radiography

Reference API-650, Paragraph 6.1.6

14. After an aboveground storage tank is completed, what shall be done with the radiographs?

a) They shall become the property of the insurance companyb) They shall become the property of the manufacturerc) They shall become the property of the purchaserd) They shall become the property of the API

Reference API-650, Paragraph 6.1.8.2

15. According to API-650, magnetic particle examination shall be performed to a written procedure. The examiner shall have his/her vision checked and be able to read which of the following?

a) The magnetic particle written procedure at a distance not less than 12 inchesb) A Jaeger Type 3 standard chart at a distance not less than 12 inchesc) A Jaeger Type 1 standard chart at a distance not less than 12 inchesd) A Jaeger Type 2 standard chart at a distance not less than 12 inches

Reference API-650, Paragraph 6.2.2 and 6.2.3 (a)




16. Ultrasonic examination shall be performed in accordance with a written procedure. Examiners shall be qualified and certified by the manufacturer as meeting the requirements of certification as generally outlined in which of the following?

a) Level II or Level III of ASNT SNAT-TC-1Bb) Level II or Level III of ASNT SNT-TC-1Bc) Level II or Level III of ASNT SNAT-TC-1Ad) Level II or Level III of ASNT SNT-TC-1A

Reference API-650, Paragraph 6.3.2 and 6.3.3

17. Liquid penetrant examination shall be performed in accordance with a written procedure. The examiner shall have his/her vision checked and be able to read which of the following?

a) The liquid penetrant written procedure at a distance not less than 12 inchesb) A Jaeger Type 2 standard chart at a distance not less than 12 inchesc) A Jaeger Type 1 standard chart at a distance not less than 12 inchesd) A Jaeger Type 3 standard chart at a distance not less than 12 inches

Reference API-650, Paragraph 6.4.2 and 6.4.3 (a)

18. Undercutting of welds attaching nozzles, manholes, cleanout openings, and permanent attachments shall not exceed which of the following?

a) Undercutting shall not exceed 1/64th inchb) Undercutting shall not exceed 3/32nd inchc) Undercutting shall not exceed 1/32nd inchd) Undercutting shall not exceed 3/64th inch

Reference API-650, Paragraph 6.5.1 (b)




Answers to API-Standard 650 Section 6, Methods of Inspecting Joints

Question Number Answer1 D2 A3 D4 C5 A6 C7 B8 D9 A10 C11 D12 A13 B14 C15 D16 D17 B18 A








Section 7 – Welding Procedure and Welder Qualifications

1. Who is responsible for preparing the welding procedure specification, performing the qualification tests, and preparing the procedure qualification record?

a) The welding operator or welderb) The purchaser’s inspectorc) The purchaser’s welding engineerd) The erection manufacturer or the fabrication manufacturer if other than the

erection manufacturer

Reference API-650, Paragraph 7.2.1.1 2. The manufacturer has the approval of the purchaser to use a material listed in API-650

but not included in the applicable table of ASME Section IX. What Group number would this material be included in if the minimum tensile strength is specified at 73,000 psi?

a) This material would be included in Group number 2b) This material would be included in Group number 1c) This material would be included in Group number 3d) This material can not be used in AST construction


3. When impact tests of the heat-affected zone are required, how shall this requirement be treated?

a) Heat treated condition of the base metal shall be a non-essential variableb) Heat treated condition of the base metal shall be an essential variablec) Heat treated condition of the base metal shall be a supplementary essential

variabled) Heat treated condition of the base metal does not need to be addressed on the

welding procedure specification


4. If a protective coating has been applied to weld edge preparations, how is this condition treated on the welding procedure specification?

a) The coating shall be removed and does not affect the weld and therefore does not need to be addressed

b) The coating shall be included as an essential variablec) The coating shall be included as a non-essential variabled) The coating shall be included as a supplementary essential variable





5. Materials to be used at a design metal temperature below ____, the qualification of the welding procedure for vertical joints shall include impact tests of the weld metal.

a) 50Fb) 32Fc) 60Fd) 0F


6. Welder qualification tests conducted by one manufacturer shall not qualify a welder or welding operator to do work for another manufacturer.

a) Trueb) False


7. Traceability to a welder or welding operator, either by welder’s identification stamp or “weld map”, is required on all but which of the following?

a) Shell horizontal weld jointsb) Shell vertical weld jointsc) Annular plate butt welds (when annular plates are required)d) Roof plate welds and flange-to-nozzle neck welds

Reference API-650, Paragraph 7.4

Answers to API-Standard 650 Section 7, Welding Procedure and Welder Qualifications

Question Number Answer1 D2 A3 C4 B5 A6 A7 D








Section 8 - Marking

1. A nameplate shall identify aboveground storage tanks made in accordance with API-650. Where must this nameplate be located on the completed tank?

a) This nameplate shall be attached to the tank shell adjacent to a manhole or to a manhole reinforcing plate immediately to the right of the manhole

b) This nameplate shall be attached to the tank shell adjacent to a vertical weld joint at least 48” above the shell-to-bottom weld joint

c) This nameplate shall be attached to the tank shell adjacent to a manhole or to a manhole reinforcing plate immediately above the manhole

d) This nameplate shall be attached to the tank shell adjacent to a manhole or to a manhole reinforcing plate immediately below the manhole


2. The manufacturer of an AST is required to certify to the purchaser that the tank has been constructed in accordance with API-650. How is this certification accomplished?

a) The manufacturer shall provide the purchaser with a U-1 Data Report formb) The manufacturer shall provide the purchaser with letterc) The manufacturer shall provide the purchaser with an ASME acceptable

“Certificate of Compliance”d) The manufacturer shall provide the purchaser with a notarized certificate of

compliance

Reference API-650, Paragraph 8.3

Answers to API-Standard 650 Section 8, Marking

Question Number Answer1 C2 B








Appendix A – Optional Design Basis for Small Tanks

1. What is the maximum shell thickness including corrosion allowance permitted for tanks that comply Appendix A of API-650?

a) 7/8th inchb) 3/4th inchc) 5/8th inchd) 1/2 inch

Reference API-650, Paragraph A.2.1

2. What is the maximum tensile strength, before the joint efficiency is applied, permitted in the design of small tanks in accordance with Appendix A of API-650?

a) 21000 psib) 21500 psic) 21000 ksid) 21500 ksi


3. When computing the tension in each ring (course) of a small tank designed in accordance with Appendix A of API-650, where is this tension computed?

a) The tension shall be computed 12 inches above the centerline of the course in question

b) The tension shall be computed 12 inches above the centerline of the lower horizontal joint of the course in question

c) The tension shall be computed 12 inches above the centerline of the tank in question

d) The tension shall be computed 12 inches below the centerline of the upper horizontal joint of the course in question


4. What joint efficiency factor shall be used in the design of small tanks designed in accordance with Appendix A of API-650 when spot radiographic examination is applied?

a) 1.00b) 0.90c) 0.85d) 0.70


5. What joint efficiency factor shall be used in the design of small tanks designed in accordance with Appendix A of API-650 when spot radiographic examination is omitted?

a) 1.00b) 0.90c) 0.85d) 0.70








Answers to API-Standard 650 Appendix A - Optional Design Basis for Small Tanks

Question Number Answer1 D2 A3 B4 C5 D








Appendix B – Recommendations for Design and Construction of Foundations for Aboveground Oil Storage Tanks

1. If the owner does not specify an alternative grade slope, the finished tank grade shall be crowned from its outer periphery to its center at a slope of _____.

a) The slope shall be one inch in twelve feetb) The slope shall be one inch in ten feetc) The slope shall be one inch in eight feetd) The slope shall be one inch in six feet

Reference API-650, Paragraph B.3.3

2. The owner decides that an earth foundation will be installed under a new tank installation. According to API-650 Appendix B, there are specific items that an earth foundation should accomplish. Of the following, which is not one of those items?

a) Earth foundations should provide a stable plane for support of the tankb) Earth foundations should limit settlement to values used in the design of the connecting

pipingc) Earth foundations should not settle excessively at the perimeter due to the weight of the

tankd) Earth foundations should reinforced with steel reinforcing bar to prevent sagging

Reference API-650, Paragraph B.4.1.1

3. When does Appendix B of API-650 recommend the use of a concrete ringwall foundations?a) When there is some doubt whether the foundation will be able carry the shell load

directlyb) When there will be an area in the foundation open for passing cathodic protection

equipment throughc) When the tank is located in an area that is easily accessible for pouring the concreted) When the tank erector decides a concrete foundation will be easier to install


4. When a concrete ringwall is designed, what is the minimum thickness permitted?a) The ringwall shall not be less than 8 inchesb) The ringwall shall not be less than 10 inchesc) The ringwall shall not be less than 12 inchesd) The ringwall shall not be less than 14 inches


5. How far below the lowest adjacent finish grade must the bottom of the ringwall, if founded on soil, be located?

a) The bottom of the ringwall shall be located 1 foot below gradeb) The bottom of the ringwall shall be located 1.5 feet below gradec) The bottom of the ringwall shall be located 2.5 feet below graded) The bottom of the ringwall shall be located 2 feet below grade





Answers to API-Standard 650 Appendix B - Recommendations for Design of Foundations for Aboveground Oil Storage Tanks

Question Number Answer1 B2 D3 A4 C5 D








Appendix C – External Floating Roofs

1. Unless otherwise specified by the purchaser, all deck plates shall have a minimum nominal thickness of _____.


Reference API-650, Paragraph C.3.3.2

2. What is the minimum slope required for the top decks of double-deck roofs and of pontoon sections?

a) 3/16 inch in 12 inchesb) 3/16 inch in 12 feetc) 3/16 inch in 10 inchesd) 3/16 inch in 10 feet


3. Pontoon type floating roofs shall have sufficient buoyancy to remain afloat on a liquid with a specific gravity of ____.

a) 1.0b) .87c) .85d) .70


4. What is the minimum size of roof drain required for a pan-type floating roof that is 110 feet in diameter.

a) NPS 4b) NPS 3 c) NPS 2 d) NPS 2.5

Reference API-650, Paragraph C.3.8

5. Floating roof support legs and attachments shall be designed to support the roof and a uniform live load of at least _____ per square foot.

a) 100 poundsb) 75 poundsc) 50 poundsd) 25 pounds





6. Manholes are required in floating roofs for access to the tank interior and for ventilation. What is the minimum nominal diameter of these manholes?



7. If the sealing device between the outer periphery of the roof and the tank shell employs steel shoes, what material shall these shoes be made of and what is the minimum nominal thickness permitted?

a) The shoes shall be made from galvanized sheet ASTM A 924 with a minimum thickness of 14 gauge

b) The shoes shall be made from galvanized sheet ASTM A 924 with a minimum thickness of 16 gauge

c) The shoes shall be made from galvanized sheet ASTM A 924 with a minimum thickness of 18 gauge

d) The shoes shall be made from galvanized sheet ASTM A 924 with a minimum thickness of 20 gauge


8. Drainpipe and hose systems of primary drains shall be tested with water at a pressure of ___.

a) 0.5 psigb) 5.0 psigc) 50 psigd) 50 ksig


Answers to API-Standard 650 Appendix C - External Floating RoofsQuestion Number Answer

1 C2 A3 D4 B5 D6 A7 B8 C

Should you find a mistake or disagree with any answer listed, please bring it to our attention for correction or clarification. BAY Technical Associates, Inc. has attempted to provide answers developed from paragraphs of the respective Code, Standard, or Recommended Practice. You can reach BAY Tech by phone at (610) 594-9036, by fax at (610) 594-2612, or by e-mail at [email protected].





Appendix G – Structurally Supported Aluminum Dome Roofs

1. Aluminum dome roofs may be added to an existing tank. Who has the responsibility for providing reinforcement to enable the tank to support the roof?

a) The fabricator if other than the erectorb) The erector if other than the manufacturerc) The manufacturerd) The purchaser

Reference API-650, Paragraph G.1.3.2

2. Aluminum dome roof shall be supported only from the rim of the tank. The design of the connection shall allow for thermal expansion. What is the minimum temperature range that must be used for the design?

a) 110Fb) 120Fc) 125Fd) 130F

Reference API-650, Paragraph G.1.4.1

3. Aluminum panels shall be designed in accordance with ___ and Appendix G of API-650.a) AA ASM-35b) AA ASM-135c) AA ASM-53d) AA ASM-315

Reference API-650, Paragraph G.3.2

4. The internal pressure of tanks with aluminum dome roofs shall not exceed the weight of the roof. In no case shall the maximum design pressure exceed ____

a) 9 psigb) 9 inches of mercury columnc) 0.9 psigd) 9 inches of water column


5. The maximum dome radius shall be ____ times the diameter of the tank. The minimum dome radius shall be ___ times the diameter of the tank unless other wise specified by the purchaser.

a) 1.2 and 0.9b) 1.2 and 0.5c) 1.2 and 0.7d) 1.2 and 0.8





Answers to API-Standard 650 Appendix G - Structurally Supported Aluminum Dome Roofs

Question Number Answer1 D2 B3 A4 D5 C








Appendix H – Internal Floating Roofs

1. Internal floating roofs may be designed and built to float and rest in a reasonably flat position. A rim or skirt shall be provided around the roof periphery and all columns, ladders, and other roof openings. How far must this rim extend above the liquid?


Reference API-650, Paragraph H.4.2.1 and 4.2.3

2. Internal floating roofs shall be designed to safely support at least _____.a) 500 pounds over 1 square footb) 500 pounds over 1 square inchc) 500 pounds over 1 square yardd) 500 pounds over 1 square meter

Reference API-650, Paragraph H.4.2.5

3. What is the minimum required thickness, excluding corrosion allowance, for a steel internal floating roof in contact with vapor?

a) The minimum thickness shall be 0.094 inchesb) The minimum thickness shall be 9 gaugec) The minimum thickness shall be 0.07 inchesd) The minimum thickness shall be 7 gauge

Reference API-650, Paragraph H.4.4

4. A peripheral seal shall be designed to accommodate ____ of local deviation between the floating roof and the shell.



5. Which of the following is not permitted as a design for internal floating roofs in contact with the liquid?

a) Double deck b) Pontoonc) Metallic Pand) Metallic on floats





6. Metallic internal roofs on floats shall be designed to be buoyant enough to support how much weight?

a) Twice its dead weightb) Twice the weight of two menc) 500 pounds per square footd) Three times its dead weight


7. The maximum spacing between circulation vents shall be _____.a) 24 feetb) 32 feetc) 28 feetd) 30 feet

Reference API-650, Paragraph H.6.2.2.1

8. What is the minimum number of circulation vents that must be located on the shell or fixed roof above the seal of the floating roof when the tank is full?

a) 8b) 4c) 6d) 2

Reference API-650, Paragraph H.6.2.2.1

9. How many and what size manholes must be provided in a fixed roof for access to the tank interior?

a) At least two with a nominal diameter of 24 inches eachb) At least three with a nominal diameter of 24 inches eachc) At least one with a nominal diameter of 24 inchesd) At least four with a nominal diameter of 24 inches each


10. When specified by the purchaser, inspection hatches shall be located on the fixed roof to permit visual inspection of the seal region. What is the maximum spacing between these hatches?






Answers to API-Standard 650 Appendix H - Internal Floating Roofs

Question Number Answer1 B2 A3 D4 C5 D6 A7 B8 B9 C10 C








Remaining Appendixes

Appendix D – Technical Inquiries

This appendix provides guidance for requesting interpretations of API Standard 650. The inquiry format is specific must be followed. Basically inquiries shall be formulated in such a way that they can be answered “yes” or “no”.

Appendix E – Seismic Design of Storage Tanks

According the “Body of Knowledge”, question pertaining to this Appendix will be excluded on the API-653 examination.

Appendix F – Design of Tanks for Small Internal Pressures


Appendix I – Under-tank Leak Detection and Sub-grade Protection

This appendix provides basic recommendations, which may be specified by the purchaser, for design and construction of tank and foundation systems that provide leak detection and sub-grade protection in the event of tank bottom leakage, and provides for tanks supported by grillage. Typically, this appendix would only be used as a guide. The body of knowledge states that questions pertaining to tanks supported by grillage will be excluded on the examination.

Appendix J – Shop Assembled Storage Tanks

This appendix presents requirements covering the complete assembly of tanks that do not exceed 20 feet in diameter.

Appendix K – Application of the Variable-Design- Point Method


Appendix L – API Standard 650 Storage Tank Data Sheets

This appendix provides data sheets to be used by the purchaser in ordering a storage tank and by the manufacturer upon completion of construction of the tank.

Appendix M – Requirements for Tanks Operating at Elevated Temperatures

This appendix provides additional requirements for tanks with maximum operating temperatures from 200F to 500F.




Appendix N – Use of New Materials That Are Not Identified

This appendix provides requirements for the use of new or unused plate and pipe materials that are not completely identified by this standard as complying with any listed specification.

Appendix O – Recommendations for Under-Bottom Connections

This appendix contains recommendations for the design and construction of under-bottom connections for storage tanks

Appendix P – Allowable External Loads on Tank Shell Openings

This appendix presents minimum recommendations for design of shell openings that conform to Table 3 – 8 that are subject to external piping loads. The purchaser or manufacturer may agree upon an alternative or supplemental design. According to the body of knowledge, questions pertaining to this appendix will not be asked on the examination.

Appendix S – Austenitic Stainless Steel Tanks





NOTES


Documents

Section 3 API-650 Practice Questions