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API 653 Exam Prep - Open Book 2024
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*When using the preheat alternative weld method, the temperature shall be checked ___ to assure the minimum temperature is maintained during welding. A) one inch or two times the material thickness whichever is greater, on each side of the groove. B) two inches or two times the material thickness, whichever is great, on each side of the groove C) Three inches or three times the material thickness, whichever is greater, in each side of the groove D) Four inches or four times the material thickness whichever is greater on each side of the groove - ✔✔D *For a roof to be considered as frangible: A) the top angle shall be larger than 2 X 2 3/16 in B) the top angle attachments weld shall me a minimum of 3/16" C) The roof support members shall not be attached tot he roof plate D) the roof support members shall be attached to the roof plate - ✔✔C *What are the examiner qualification for visual examination for tank inspection? A) Shall comply with ASME Sect V, article 9 B) Shall have visual capable of reading a standard Jaeger J-1 chart C) Shall have biennial visual examination by a license optometrist D) There are no requirements - ✔✔D *Sulfuric acid corrosion can be inspected and monitored with: A) Shear wave ultrasonic testing B) Visual Inspection C) Coupons and ER probes
D) Wet fluorescent magnetic particle testing - ✔✔C *What is the maximum interpass temperature permitted, in API 653, when using the preheat alternative to PWHT welding method? A) 600°F B) 450°F C) 300°F D) 800°F - ✔✔A *Radiographic examinations are required for all of the following except: A) New and replaced shell insert plate and door sheet welds B) All repairs to butt-welds that are examined ultrasonically C) New annular plate joints D) Shell Butt-welds on reconstructed tanks - ✔✔B *For tanks constructed of material having a yield strength equal to or less than _____, it may not be necessary to raise all nozzles, when installing a new bottom in an existing tank, if certain conditions are met. A) 70000 psi B) 60000 psi C) 50000 psi D) 40000 psi - ✔✔C *A tank, built to the ninth edition of API 650, is to have a new bottom installed. The installation will be performed by slotting the shell and inserting the new bottom. The shell plate material is A-516 Gr. 60 and the new shell to bottom weld will be made using low-hydrogen electrodes. An existing NP2 12 reinforced shell penetration does not meet the minimum weld spacing requirements of the current API 650 edition. There is 5-1/2 inches between the toe of the shell to bottom weld and the toe of reinforcing plate fillet weld. The inspector should: A) Order the penetration raised to comply with the current API 650 weld spacing requirements B) Order the penetration raised to obtain a minimum of 6 inches between the toe of the shell to bottom weld and the toe of reinforcing plate fillet weld.
*API 653 requires the perimeter welds on the welded on patches on the critical zone be: A) Two-pass and examined by visually and by MT or PT B) Welded on pathc plats are not permitted for repairs in the critical Zone C) Single pass and examined visually and by MT or PT D) Single pass and examined visually and by vacuum box test - ✔✔A *The inspector finds a thin area in the shell of a 150 ft. diameter riveted tank. The maximum horizontal dimension of the thin area in four inches and the maximum vertical dimension is one inch. The nearest edge of the thin area is twelve inche from a vertical seam and fifteen inches from horizontal seam. it is decided to make the repair using a weld-on lap patch. Which is the minimum repair plate dimension? A) A lap patch is not permitted on a riveted shell B) Four inches C) Two inches D) Six inches - ✔✔B *New lap welded shell patch plate attachment welds shall be examined by which of the following? A) Visually and by MT or PT B) MT or PT only C) Vacuum box and solution film D) Visually only - ✔✔A *A locally thinned area is found in a 10 year old tank. The thinned area is located near a weld in the third shell course from the bottom; 20 feet below the maximum liquid level. The tank was built to API 650 eighth edition requirments with RT done as required by the basic standard. The tank is 200 feet in diameter and 40 feet high. The RN specific gravity of the product stored in the tank is 0.86. The tank material allowable stress is 33,000 psi. The joint efficiency is 1.0. What minimum thickness is required? A) 0.257 inches B) 0.298 inches C) 0.319 inches D) 0.271 inches - ✔✔D
*It may not be necessary to raise all nozzles, when installing a new bottom in an existing tank, if certain conditions are met. Blend grinding of existing welds and examination are among these requirements. Of the following, which is not a requirements for the welds of nozzles that are not to be raised? A) For circular reinforcements plates, blend grind the attachment weld from the four o'clock to the eight o'clock position B) For diamond shaped reinforcement plates, blend grind the inside and outside of the shell to bottom weld a minimum distance of one penetration diameter length on either side of the penetration centerline C) The blend ground length of welds shall be examined by PT before and after hydro test D) the blend ground length of welds shall be examined by MT before and after hydro test. - ✔✔C *In assessing the technical requirements for aboveground storage tanks, the storage tank engineers: A) By consulting with appropriate specialist, should be regulated as being able to properly asses the tank structural requirements B) Cannot make fitness-for-service evaluations C) May not review welding specification, procedures, or inspect welds while in progress or completed weld radiographs D) Must be an API 653 Certified Tank inspectors too - ✔✔A *During the inspection of a 160ft. diameter AST, of unknown material, average corrosion is detected. The least thicknes in the corroded area is 0.625" and the critical length "L" is located in the first course beginning 3 feet above the bottom-to-shell joint. The tank has a design liquid fill level of 42 feet and a product specific gravity of 1.10. What is the acceptable minimum thickness and considering the least remaining thickness, may the tank continue operation? A) Minimum thickness = 0.743 tank may continue operation .625 >(.6)(.743) B) Minimum thickness = 1.08 tank may not continue operation .625 < (.6)(1.08) C) Minimum thickness = 1.06 tank may not continue operation .625 < (.6)(1.06) D) Minimum thickness = .756 tank may not continue operation .625 > (.6)(.756) - ✔✔D *An inspector has determined that some repairs are required to a shell manway, the standard to which the tank was built is not known. The inspector has been able to determine that the tank was built in January 1942 to an API Standard. The "as-built" standard for this tank is:
B) Magnetic particle examined only C) Liquid penetrant examined only D) Ultrasonic shear wave examined only - ✔✔B Welding procedures for ladder and platform assemblies, but not their attachmetns to the tank: A) may be qualified by other than the contractor who does the welding B) are not required C) Shall comply with ASME Section IX D) Shall comply with either AWS D1.1, AWS D1.6, or ASME section IX - ✔✔D *Corrosion rates for soil corrosion increase with: A) increasing metal temperature B) Lowering metal temperature C) increasing pH above 8. D) increasing resistance - ✔✔A What two factor have a significant influence on toughness and resistance to brittle fracture? A) intergranular cracking and micrvoid coalescence B) extensive cycling and elevated temperature C) Chemical properties and length of service D) Steel cleanliness and grain size - ✔✔D *Grade 350W/50W is acceptable for tank plate to a maximum thickness of: A) 60mm (2.36in) if fully killed and made to a fine grain practice B) 60mm (2.36in) if semi-killed and made to a fine grain practice C) 45mm (1.75in) if fully killed and made to a fine grain practice D) 45mm (1.75in) if semi-killed and made to a fine grain practice - ✔✔C
The rate of corrosion for underside corrosion on tank decreases significantly when the pH of sand pad is: A) greater than 8 pH B) greater than 5 pH C) less than 8 pH D) less than 5 pH - ✔✔A A hydrostatic test is to be performed on an AST, constructed a 285 Gr. C material. Several of the bottom shell course plates are found to generally corroded to a minimum thickness of 0.70 inch. The tank was originally erected using 8ft shell courses, is 40ft high, and has a diameter of 190 feet. The efficiency used in the design was 1.0 and the original thickness was 1.0 inch. What is the aximum hydrostatic test height based on the current conditions? A) 32.883 feet B) 36.768 feet C) 37.842 feet D) 40.000 feet - ✔✔C When API 653 does not provide specific evaluation procedures or acceptance criters for a specific type of degradation, what document can be used to perform these evaluations A) API RP 579 B) API 650 C) API RP 571 D) API RP 580 - ✔✔A A Tank is being changed from storing asphalt that is heated to 250°F to storing gasoline that is not heated. The tank must meet the requirments of: A) The current UL tank specification B) Appendix M of the current edition of API 650 C) The current applicable standard D) The edition of API standard to which the tank was built - ✔✔C What is the minimum external projection outside the shell for bottom plates in a new tank?
D) Flush on the inside of the tank - ✔✔D A new tank is to be hydrostatically testes. The tank is forty feet (12m) high, two hundred feet (61m) in diameter, and it is fabricated of A-283 Gr. C shell plates. What is the minimum hydrostatic shell thickness of the bottom shell course? A) 0.901" B) 0.658" C) 0.925" D) 0.750" - ✔✔A Flange material used for tank repair and alteration shall meet the inimum requirments for the material specifications in which of the following? A) The as built standard B) ASME Section II C) API 650 7th Ediion D) The current applicable standard - ✔✔A In regards to underside corrosion of tank bottoms, the corrosion rate of steel in a wet environment: A) Is independent of temperature increases above 100°F B) Will decrease at temperature above 100°F C) May double with every 50°F increase above 100°F D) May double with every 18°F increase in temperature above 77°F - ✔✔D What is the definition of density of material? A) Volume per unit mass B) Weight per unit volume C) Weight per square inch D) Mass per unit volume - ✔✔D
Soil Corrosion appears as external thinning with : A) Localized loss due to coating failure B) Localized loss due to pitting C) localized loss due to oxygen D) Localized loss due to soil - ✔✔B missing - ✔✔missing When welding on a tank shell constructed of Group I steel that is greater than 1.5 inches thick below what minimum metal temperature preheat? A) 200°F B) 250°F C) 350°F D) 300°F - ✔✔A Existing welds on a tank shell are found to be closer than allowed by API 650. Under what conditions can these welds be considered to be acceptable for continued operation. A) Examined by PT with no rejectable indications B) examined by RT with no rejectable indications C) Weld repairs to assure acceptable spacing D) Examined by MT with no rejectable indications - ✔✔C Which of the following is an advantage of thick film un-reinforced linings? A) Easy to install on complex geometry B) Proven to have hole-bridging capability C) Does not require the use of plural component spray equipment D) Fast curing and can be put back in service after 24 hours at ambient temperature - ✔✔D What is the maximum hydrostatic fill height of a tank given the following conditions:
B) Use of low alloy steel containing up to 9% chromium C) Use of materials specifically designed for low temperatures D) Use material specifically designed for high temperatures - ✔✔C The requirements of which standard shall be considered in the evaluation and subsequent alteration to the tank roof and roof to shell junction? A) As built standard B) API 579 C) Current applicable standard D) The original construction code - ✔✔C Grade 260W/38W is acceptable for tank plate to a maximum thickness of: A) 25 mm (1 in.) if semi-killed API 650 B) 50 mm (2 in.) if fully killed C) 32 mm (1.25 in) if semi-killed D) 40 mm (1.5 in.) if semi-killed - ✔✔A Which of the following soils would be expected to be the most corrosive to the tank bottom? A) Soils with high resistivity B) Soils with high moisture content, high dissolved salt concentrations and high acidity C) Soils with low moisture content, high dissolved salts and high acidity D) Soils with low moisture content and low oxygen availability - ✔✔B The shell material of a tank is considered to have acceptable recognized toughness when: A) the original thickness was 0.500 inches B) the current thickness is 0.500 inches and the original thickness was 0.750 inches C) the shell circumferential stress is 7200psi in its current condition D) the current lowest temperature that the tank will be exposed to is 40°F - ✔✔A
Soil Corrosion appears as external thinning with : A) Localized loss due to coating failure B) Localized loss due to pitting C) localized loss due to oxygen D) Localized loss due to soil - ✔✔B A properly selected, applied, and maintained internal bottom linings provides leak prevention by____ A) limiting internal corrosion of the steel bottom B) creating a cathodic protection barrier on the internal surface C) enhancing the effectiveness of the external cathodic protection system D) Limiting internal corrosion of the support columns and landing pads - ✔✔ 57 External measurements for tank settlement shall be taken at points having a maximum spacing of ____ around the circumference. A) 24 feet B) 28 feet C) 32 feet D) 36 feet - ✔✔ 62 As a minimum, what safety rules and regulations should be reviewed? A) OSHA B) MIOSH C) Site D) Local jurisdiction - ✔✔C Which of the following is an advantage of thick film un-reinforced linings? A) Easy to install on complex B) Proven to have hole-bridging capability C) does not required the use of plural component spray equipment
Exposure to high solution strength caustic can results in general corrosion of carbon steel above: A) 175°F and very high corrosion rates above 200°F B) 250°F and very high corrosion rate above 300°F C) 350°F and very high corrosion rates above 400°F D) 475°F and very high corrosion rate above 500°F - ✔✔A The owner/operator requires a connection to be made in an in-service tank. The shell material is of unknown toughness and the thickness is 1.25". The minimum design metal temperature is 45°F. What is the maximum diameter hot tap connection that may be installed in this tank? A) NPS 18 B) NPS 14 C) NPS 8 D) NPS 4 - ✔✔D The manufacturer has the approval of the purchaser to use a material listed in API 650 but not included in the applicablke table of ASME Section IX. What group number would this material be included in if the minimum tensile strength is specigfied at 73,000 psi? A) This material would be included in Group number 2 B) This material would be included in Group number 1 C) This material would be included in Group number 3 D) This material can not be used in AST construction - ✔✔A What is the maximum out-of-plumbness of the top of the shell, relative to the bottom of the shell, of a reconstructed tank with a total height of 62.25 feet? A) 7.47" B) .6225" C) 6.25" D) 5" - ✔✔D The minimum thickness of a tank was established at 0.573 inch. The shell was fabricated from 1.0 inch plate and included a 0.125 inch corrosion allowance. The tank has been in service for eight years and
current ultrasonic thickness measurements reveal an average thickness of 0.834 inch. Based on this information determine when the next ultrasonic thickness measurements will be required/ A) fifteen years B) Ten years C) Six years D) Three years - ✔✔C An aboveground reconstructed tank is 126.5 feet in diameter. What is the maximum or minimum radius permitted measured at the second shell course up from the bottom? A) Max- 759.75" Min-758.25" B) Max-761.25" Min-756.75" C) Max-1520.25" Min-1515.75" D) Max-128.75" Min-124.25" - ✔✔B For a reconstructed tank, what is the maximum weld reinforcement thickness permitted on each side of the plate which is 7/8" thick? A) Vertical Joint- 3/32" Horizontal Joint-1/8" B) Vertical Joint-1/8" Horizontal Joint-3/16" C) Vertical Joint-3/16" Horizontal Joint-1/4" D) Vertical Joint-1/4" Horizontal Joint-5/16" - ✔✔B A 24-inch manhole is to be installed in a roof plate and it is anticipated that work may be carried ion 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 following 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" - ✔✔B
D) The current flow will be from the new bottom and metal loss will be from the old bottom - ✔✔B What is the maximum permitted transmitted density limit between the body of the image quality indicator and the are on interest for a single film viewing for radiographs using an X-Ray source? A) 1.8 ±. B) 4.0 ±. C) 1.4 ±. D) 8.0 ±.05 - ✔✔B A welder qualifies by radiography on a 3/8" coupon. A 3/16" slag inclusion is shown on the radiograph. Is the welder qualified? Why or why not? A) Yes, the maximum slag inclusion allowed for this thickness is 1/4" B) No, the maximum slag inclusion allowed for this thickness is 1/8" C) Yes, slag inclusions are not a rejectable discontinuity when qualify by RT D) No, the maximum slag inclusion allowed for this thickness 3/16" - ✔✔B Atmospheric corrosion is a form of corrosion that occurs from moisture associated with atmospheric conditions. Marine environments and moist polluted industrial environments with airborne contaminants: A) Are not as severe and result in a very little corrosion B) Are most severe and result in a higher corrosion rates C) Are not a concern as long as the systems are insulated C) Have the same rate of corrosion as dry rural environments - ✔✔B An NPS 12 nozzle is to be installed in an existing 96 feet diameter AST. The shell course thickness is 0.625" and the reinforcement plate thickness is 0.75". What is the minimum size of nozzle-to-reinforcing plate fillet weld is required to comply with API 650
A) 0.3125"
B) 0.4375"
C) 0.5625"
D) 0.6250" - ✔✔A
In the Shielded Metal Arc Welding(SMAW) process, electrode covering performs all but which of the following? A) Provides scavengers, deoxidizers, and fluxing agents to cleanse the weld B) Provides a slag blanket C) Provides a means of adding alloying elements D) Provides elements to reduce hardness - ✔✔D Prior to welding the new vertical joints, the existing horizontal joints shall be cut for a minimum distance of ____ inches beyond the new vertical joints. A) Six B) Eight C) Twelve D) Sixteen - ✔✔C What is the minimum projection of trimmed bottom plates beyond the outside edge of the weld attaching the bottom to the shell of a new AST having no low type reinforcing pads? A) Minimum projection is 0.02 inch B) Minimum projection is 0.20 inch C) Minimum projection is 2.00 inch D) minimum projection is 20.0 inch - ✔✔C
