API.653 Recertification Test Questions 1/14/2005 Question 1 of 25 Time Remaining: 240 Minutes Question 1: c an Question 2 of 25 Quest feet eee Question a. b ce a. n 2: a. New welds ( not repair welds) on tank bottom plates shall be examined: Visually. API 650, sect. 5, para 5.3.3 or API 653, 12.1.7.1. By magnetic particle method or liquid penetrant method By vacuum box and a solution film. By a suitable tracer gas and comparticle detector. 1 Remaining: 234 Minutes A thin area has been found in the vicinity of a shell mixer in a tank. ‘The tank is 40 foot high and 165 foot in diameter. The tank was built in 1980 per API 650 Sixth Edition per The Basic Standard with butt type joints. The tank material is A285-C. The thin area is 3.6 feet circumferentially and 2.3 feet vertically. The lowest point of the thin area Is 2.0 feet above the bottom of the tank, The average thickness over the thinnest vertical plane is 0.538 inches. What is the maximum fill height for hydrostatic test? 27,65ft 28.72ft 29.72Kt 27.72ft A new bottom is to be installed in an existing tank that was constructed to the Ninth Edition of API 650. The new bottom is to be installed by slotting the shell and inserting the new bottom. An existing 12 NPS reinforced shell penetration does not meet the minimum weld spacing requirements specified in API 650, current edition, for the new bottom. There is 5.50 inches between the toe of the shell-to-bottom weld and the toe of the reinforcing plate weld. The new shell-to- bottom weld was made with E 7018 electrode. The tank shell is ASTM 516 Gr. 60. The inspector should: Require the penetration to be raised such that there is at least 6 inches between the toe of the penetration reinforcing pad weld and the toe of the shell to bottom weld. Accept the penetration if the penetration weld and the shell-to-bottom weld are blend ground. Require the penetration to be raised as the shell-to-bottom weld electrode was not an electrode permitted by API 653. Require the penetration to be raised to meet the current API 650 weld spacing requirements. API 653, 9.10.2.1.4Question Cc c c c Question nan a Question aaond Question Peep eeeee eet 4: b. For repairs and alterations all proposed design, work execution, materials, welding procedures, examination and testing materials: ‘Must be approved by the authorized inspector or by the storage tank engineer, API 653, section 9, para 9.1.4 Need not be specifically approved by the authorized inspector if they are designated as routine repairs by the authorized inspector. Need only be approved by the repair organization if the authorized inspector is not on the job. Must be approved by the authorized inspector only. The minimum thickness of welded on patch plate on a bottom of a tank with a maximum operating temperature exceeding 90 degrees C (200 degress F) but not exceeding 260 degrees C (500 degrees F) is: As thick as the existing tank bottom 3/8" API 653, 9.10.1.10 API 650 Appndix M, M.1.1 14" v2" A thin area in the critical zone is to be repaired using a welded-on patch plate, The tank shell is of welded construction and 0.500 inches thick. What is the maximum thickness of the welded-on patch plate? 1/2 inch 3/8 inch 1/4 inch API 653 9.10.1.2a Repairs within the critical zone ‘A welded-on patch plate is not permitted for repairs in the critical zone. The bottom shell course of a 40-foot-high x 200-foot-diameter A 283/Grade C tank has thinned to a thickness of 0.70 inch. What is the maximum fill height for a hydrostatic test? 34.93ft 36.28ft See calc sheet 36.0ft 37.35ftQuestion 8: A "storage tank engineer" is defined in API 653 as: o Person or organization, who are knowledgeable and a i in the engin iscipli jated wit ‘evaluating the integrity and reliability of aboveground storage tanks. API 653, sect. 3.17 oc 4” engineér or the engineering staff of a contractor making repairs to * aboveground storage tanks. Cl. Aauthorized inspector with a valid API Tank Inspector Certificate who is also a registered professional engineers. A registered professional engineer in structures. Question 9: Permanent attachement welds made on ASTM 516 Gr. 60 shell plate shall be examined: Eg, By either liquid penetrant method or magnetic particle method. Ep, By liquid penetrant method. cc, Visually. API 653 Sect. 12, 12.1.4.1 Cg, By magnetic particle method. Question 10: Radiographic examinations are required for all of the following except a, New annular plate joints. CC ,, Allrepairs to butt-welds that are UT-examined. See4PI 653 . 12.1.3.2 Repairs to butt-welds, unless ultrasonically examined. cc. Tank shell butt-welds on reconstructed tanks, Eg, New and replaced shell insert plate and door sheet welds. Question 11: All repairs and aiteration work shall be approved at all designated hold points and after completion: c By the repair organization if the repairs were done according to the specified repair and/or alteration procedures. b, Need not be approved if approval will delay work progress. & 9.43 c Cc By the authorized inspector or storage tank engineer. API 653, Eq, By the authorized inspector only.Question 12: ca EC .. Cc Boa Question 13: o Co. Eo. Coa Question 14: oo oo. oo. Coa Question 15: oa. Co. Be Coa In assessing the technical requirements for aboveground storage tanks, the storage tank engineers: Must retain an API certified tank inspector to inspect the tank. By consulting with appropri should be reaard bel re tank, requirements. Cannot make fitness-for-service evaluations ‘Are not authorized to review welding specification, procedures, or inspect weld while in progress or completed weld x rays. When aqueous developer is applied to a wet surface while performing liquid penetrant examination, drying time may be decreased by using warm air: but blotting is not permitted. ASME V T-675.2 and blotting is acceptable. that must raise the part temperature above 125 F (52 C). that must raise the part temperature above 150 F (65 C). In Submerged-Arc welding (SAW), for the machine or automatic welding process, a change in: oscillation is an essential variable. width is a nonessential variable. frequency or oscillation is a nonessential variable. I variable, ASME WPS Essential Var. oscillation is a nonessenti Tables ‘A. new bottom is being installed in an existing tank by slotting the shell. The tank is constructed of A 516-70 material. Existing regular type shell penetrations with reinforcing plates need not be raised if: A minimum of 4” is maintained between the shell-to-bottom near plate periphery weld. API 653 9.10.2.1.5 2 A516-70 Y= All regular type flanged shell penetrations must be raised. 18,000 ‘A minimum of 2" is maintained between the shell-to-bottom weld toe and the nearest weld toe of the nozzle reinforcing plate periphery weld. All regular type flanged shell penetrations larger than 6" NPS must be raised.Question 20: Ee .. c Coe Cc Question 21: c Question 22: Co. Boa Question 23: Es Go. Cc Cc Densitometers shall be calibrated at least every 90 days using a national standard step tablet or a step wedge calibration film, traceable to @ national standard step tablet and: having at least 5 steps with nsities from at | ‘through 4.0, ASME V Article 2, Sect T-262.1 having at least 5 steps with neutral densities from at least 1.0 through 3.0. having at least 4 steps with neutral densities from at least 1.0 through 4.0. having at least 4 steps with neutral densities from at least 1.0 through 3.0 For tank reconstruction, inspection hold points shall be designated by: Agreement between the tank owner/operator and the tank reconstruction contractor. An engineer experienced in storage tank design. Agreement between the authorized inspector and an engineer experienced in storage tank design. ‘The authorized inspector. API 653 9.1.3, When installing a new bottom in an existing tank, It may not be necessary to raise all of the nozzles if certain conditions are met. Among those conditions are requirements for blend grinding of existing welds and examination requirements. All of the following are Tequirements for the welds of nozzles that need not be raised except: For diamond shaped reinforcing 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. API 653, 9.10.2.1.5 i ‘The blend ground length of welds shall be magnetic particie examined before and after hydrotest. API 653, 9,10.2.1.5 € For circular reinforcement plates, blend grind the attachment weld from the "four o'clock" to the "8 o'clock" position. API 653, 9.10.2.1.51 lend gro! f welds shall be examined by liquid penetrant before and after hydrotest. API 653 9.10.2.1.5MT Oxidation is defined as: The loss of electrons by a constituent of a chemical reaction, API RP 651 3.3.3 The gain of electrons by a constituent of a chemical reaction. ‘The reduction or prevention of corrosion of a metal in an electrolyte by galvanically coupling it to a more anodic material. The fracture of a metal by the combined action of oxygen and tensile stress.Question 24: oc C G & a Question 25: a ona Each radiographic exam procedure shall include distance from source side of object to the film at a distance equal to the film width. a distance equal to half the film width. the maximum source-to-object distance. the minimum source-to-object distance. ASME V 1221.1 Roof support columns are being replaced in a tank. Some of the columns will be new rolled structural C sections. The minimum material requirement for the new rolled structural C sections Is : ASTM A36 or A992 API 653 Section 7, para 7.3.2 ASTM A7 ASTM A36 or ASTM A7 ASTM A36 or ASTM A 285-CQuestion 16: c c o c Question 17: Cc 6 b Question 18: Gc c c o Question 19: C Cc c oC In Submerged-Arc welding (SAW), a change in the nominal size of the electrode or electrodes specified in the WPS Is: a nonessential variable provided the nominal electrode is not changed by more than one size. an essential variable. an essential variable if nominal electrode is changed by one size. @ nonessential variable. ASME WPS Essential Var. Tables An electrical isolation cell is: An electrochemical cell the electromotive force of which is due to a difference in air (oxygen) concentration at one electrode compared with that at another electrode of the same material. An electrical circuit which has defined resistors and capacitors used for isolating a particular part. An electrical circui .ctrical current in areas of a metal to other areas through a solution capable of conducting electricity (electrolyte). API RP651 SCN 3.15 An array of anodes installed vertically and at a nominal depth of 15m (50M) or more below the earth's surface in a single drilled hole. Acceptance standards for magnetic particle examinations are defined in: API 650, Section 6.2.3 ASME Section IV API 653, Section 7 ASME Section V, Article 7 See API 653 Appendix F.3.3 All inspection hold points for dismantling ‘or reconstruction of a tank shall be approved by: Agreement between the authorized inspector and an engineer experienced in storage tank design. The authorized inspector or an engineer experienced in storage tank design. API 653 10.1.4 The authorized inspector only. Agreement between the authorized inspector and the tank reconstruction contractor.653 Certification Renewal Quiz Question Question 1 of 25 Time Remaining: 240 Minutes imum documentation to be submitted and alterations will be designated by 1: Inspection hold points and mi upon job completion for rep: the: Eg, Authorized inspector. API 653 9.1.3 4, owner/User's engineering department. Eg, Repair organization. EL g, Storage tank inspector. Question 2 of 25 Time Remaining: 239 Minutes Question 2: In assessing the technical requirements for aboveground storage oC Cc 5 tanks, the storage tank engineers: a, Cannot make fitness-for-service evaluations b, Must retain an API certified tank inspector to inspect the tank. By consulting with appropriate specialists, should be regarded as being able to properly assess the tank structural requirements. API 653 3.17 ‘Are not authorized to review welding specification, procedures, or inspect weld while in progress or completed weld x rays. 653 Certification Renewal Quiz Question 3 of 25 Time Remaining: 238 Minutes Question 3: New welds ( not repair welds) on tank bottom plates shall be GC onona examined: a. By vacuum box and a solution film. Visually. API 653 12.1.7.1 By magnetic particle method or liquid penetrant method. a. By a suitable tracer gas and comparticle detector.653 Certification Renewal Quiz Question 40f25 | Time Remai 1g: 237 Minutes Question 4: Magnetic particle or liquid penetrant examination is required in all of the following except: Eg, Existing shell-to-bottom welds that will be under a patch plate. pb, Root and final weld pass of patch plate to bottom in the critical zone, & 614 ‘The back-gouged surface of the root pass and final surfaces of new co Cl. Annular plate butt-welds root pass and final pass. API 650 5 F shell plate welds where the shell is thicker than 1". 653 Certification Renewal Quiz Question 5 of 25 Time Remaining: 237 Minutes Question 5: The breakover point in a tank is: © g, The perimeter of the tank bottom sump. The area on a tank bottom where settlement begins .API 653 b. Appendix B 2.3.2 b C G The edge of the roof support column base support. c id. The point where a tank roof Is welded to the shell.653 Certification Renewal Quiz Question 6 of 25 | Time Remaining: 236 Minutes Question 6: When installing a new bottom in an existing tank, it may not be necessary to raise all of the nozzles if certain conditions are met. Among those conditions are requirements for blend grinding of existing welds and examination requirements. All of the following are requirements for the welds of nozzles that need not be raised excep! [E) __ The blend ground length of welds shall be examined by liquid @. penetrant before and after hydrotest. API 653 9.10.2.1.5.e c For circular reinforcement plates, blend grind the attachment weld >. from the “four o'clock" to the "8 o'clock" position. 2. For diamond shaped reinforcing 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. El. The blend ground length of welds shalll be magnetic particle 4. examined before and after hydrotest. 653 Certification Renewal Quiz Question 7 of 25 Time Remaining: 234 Minutes Question 7: Cc c n For tank inspection, the examiner qualifications for visual examination are: Personnel shall meet the requirements of ASME, Section V, Article 9, Personnel shall have an annual vision test to assure natural or corrected near distance acuity such that they are capable of reading standard d-1 letters on standard daeger test type letters. Personnel shall have a biannual vision test. There are no requirements. API 653 Appendix F 2.3653 Certification Renewal Quiz Question 8 of 25 | Time Remaining: 233 Minutes Question 8: The minimum dimension for a welded-on patch plate that overlaps a c Cc o co bottom seam or an existing patch is: a. 12" API 653 9.10.1... b. &* 8° a. 653 Certification Renewal Quiz Question 9 of 25 Time Remaining: 233 Minutes Question 9: Limited or routine repairs that will not require hydrostatic testing or do ot require an engineering evaluation may be: May be completed by the repair organization without the authorized inspector's approval. Require specific authorization by the authorized inspector. May be done without specific authorization if limited to 2 manhours of labor. [ g, Generally authorized by the authorized inspector. API 9.1.3 653 Certi Question 10 of 25 Time Rem: ation Renewal Quiz jing: 232 Minutes Question 10: Radiographic examinations are required for all of the following c c c c except: a. Tank shell butt-welds on reconstructed tanks. b, New annular plate joints. All repairs to butt-welds that are UT-examined. API 653 12.1.3.2 d, New and replaced shell insert plate and door sheet welds.653 Certification Renewal Quiz Question 11 of 25 | Time Remai 1G: 231 Minutes Question 14: A thin area has been found in the vicinity of a shell mixer in a tank. The tank is 40 foot high and 165 foot in diameter. The tank was built in 1980 per API 650 Sixth Edition per The Basic Standard with butt type joints, The tank material is A285-C, The thin area is 3.6 feet circumferentially and 2.3 feet vertically. The lowest point of the thin area is 2.0 feet above the bottom of the tank. The average thickness over the thinnest vertical plane is 0.538 inches. What is the maximum fill height for hydrostatic test? Eg, 27.65 Eg, 27728 Cg, 28.70" Eg, 29.72Ft St x Ex tmin Divided by 2.6Dia ADD in 2' below “L" 653 Certification Renewal Quiz Question 12 of 25 Time Remait ing: 230 Minutes Question 12: A tank is being repaired. The authorized inspector observes that an Qoan b oe electrical conduit support (unistrut) has been welded to the projectionof the bottom plate outside the shell of the tank, The bottom material is ASTM 285 Gr C. What should be the inspectors recommendation? The support is not acceptable - require that the support be removed, the weld projection be removed and the area visually inspected. ‘The support is acceptable providing welding and NDE comply with API 650 requirements, API 653 4.3.3.5 Consult an engineer experienced in tank design. The support is not acceptable as it is inside tha critical zone.653 Cert tion Renewal Quiz Question 13 of 25 Time Rem: Question 1: 230 Minutes Acceptance standards for magnetic particle examinations are defined in: ‘a. API 653, Section 7 Ep, ASME Section Vv, Article 7 API 653 Appendix F 3.3, ©, API650, Section 6.2.3 El g, ASME Section 1 653 Certification Renewal Quiz Question 14 of 25 Time Remaining: 228 Minutes Question 14: The tank material has allowable stress of 27,000 psi. The tank diameter is 165 ft. The tank height is 40 ft. The fluid specific gravi is 1.0. The joint efficiency is 1.0. What is the minimum thickness required of the bottom shell course? 0.661 inches a b, 0-636 inches ¢, 0-644 inches AAA ,_9.620 inches 2.6 ( H-1) x D x G divided by SE653 Certification Renewal Quiz Question 15 of 25 | Question 15: A tank constructed of ASTM 285 Grade C material i gan co to be hydrotested. Inspection has found several of the bottom shell course plates generally corroded. The shell courses are 8 feet high. The minimum measured shell thickness is 0.7 inces in the bottom shell course. The original shell thickness of the corroded shell plates was 1.000 inches. The tank is 40" high, 190' diameter. The original Joint efficiency was 1,0, What Is the maximum hydrostatic test height? 32.883 feet 40.000 feet 36.768 feet 37.842 feet St x E x t-min divided by 2.6Dia + 1 653 Certification Renewal Quiz Question 16 of 25 Time Remaining: 226 Minutes Question 16: A locally thin area is found in a 10 year old tank. The thinned area is ANA A a b. «. a. 6 inches high uniformly around the circumference of the tank, in the 3rd shell course from the bottom; 20 feet below the maximum liquid level. The tank was built to API 650 Eighth Edition requirements with RT done as required by The Basic Standard. The tank is 200 ft diameter and 40 ft 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? 0.271 inches 2.6 D x H x G divided by SE 0.257 inches 0.298 inches 0.319 inches653 Certification Renewal Quiz Question 17 of 25 | Time Remaining: 224 Minutes Question 17: The bottom shell course of a 40-foot-high x 200-foot-diameter A 283/Grade C tank has thinned to a thickness of 0.70 inch. What is the maximum fill height for a hydrostatic test? 36.28ft 37.35f 34,93ft Anonan r ad, 36.0ft St x E x t-min divided by 2.6 Dia +1 653 Certification Renewal Quiz Question 18 of 25 Time Remaining: 223 Minutes Question 18: Roof support columns are being replaced in a tank. Some of the columns will be new rolled structural C sections. The minimum material requirement for the new rolled structural C sections is : ASTM A36 or A992 API 653 7.3.2 ASTM A7 ASTM A36 or ASTM A7 qaoaoo|d r d. ASTM A36 or ASTM A 285-C 653 Certification Renewal Quiz Question 19 of 25 Time Remaining: 222 Minutes Question 19: The attachment welds of new lap-welded shell patch plates shall be examined: Ea, Visually only. Ep, By vacuum box and solution film. E _ Visuallly and by either magnetic particle or liquid penetrant. API 653 121,82Eg, By elther magnetic particle or liquid penetrant only. 653 Certification Renewal Quiz Question 20 of 25 Remaining: 221 Minutes Question 20: When making shell repairs using lap-welded patch plates, the minimum repair plate dimension shall be: e 2 inches by 2 inches 4 inches by 4 inches Be API 653 9.3.1.7 8 inches by 2 inches oaan d, 6 Inches by 3 inches 653 Certification Renewal Quiz Question 21 of 25 Question 21: For tank reconstruction, inspection hold points shall be designated by: The authorized inspector. API 653 10.1.3 217 Minutes c El, Agreement between the tank owner/operator and the tank }. reconstruction contractor. [ ,. Agreement between the authorized inspector and an engineer ©: experienced in storage tank design. c d. An engineer experienced in storage tank design.653 Certification Renewal Quiz Question 22 of 25, ‘Time Remaining: 216 Minutes Question 22: The bottom shell course of a 40 ft high, 165 ft diameter tank has thinned to 0.520 inches thickness. The tank was built in 1975 to API 650, Sth Edition, butt type shell joints, and Basic Standard construction. The tank material is A283 C. What is the maximum hydrostatic test height? Eg, 25.32f Ep, 27.79f Stx Ex t-min divided by 2.6D +1 Eg, 26.72f Eg, 26.79% 653 Certification Renewal Quiz Question 23 of 25 Time Remaining: 215 Minutes Question 23: A thin area in the critical zone is to be repaired using a welded- on patch plate. The tank shelll is of welded construction and 0.500 inches thick. What is the maximum thickness of the welded-on patch plate? a. W/2inch b, 3/8 Inch 1/4 inch API 653 9.10.1.2.a qanan A welded-on patch plate is not permitted for repairs in the critical zone.653 Certification Renewal Quiz Question 24 of 25 Time Remaining: 213 Minutes Question 24: ‘An inspector finds lap-welded patch plates on an existing tank shell. Some of the lap-welded patch plates are thinner than 1/2" others are thicker than 1/2 *. None are thinner than 3/16 ". What should the inspector require? All welded-on patch plates that are thicker than 1/2" must be removed and proper repairs made per API 653. API 653 9.3.3.2 oF 9.3.4.3, Consult with an engineer experienced in tank design. All of the existing welded-on patch plates are acceptable if they meet the size and location requirements of API 653. All of the existing welded-on patch plates must be removed and proper repairs made per API 653. 653 Certification Renewal Quiz Question 25 of 25 Time Remai 1g: 212 Minutes Question 25: A new tank made of an A 283/Grade C material is to be noon hydrotested. The tank is 40 feet high and has a diameter of 200 feet, What is the minimum thickness required of the bottom shell course for the hydrostatic test? 0.901 inches Tt= 2.6 D ( H-1) divided by St API 650 3.6.3.2 0.685 inches 0.882 inches 0.924 inches653 Certification Renewal Quiz Question 13 of 25 Question 13: Acceptance standards for magnetic particle examinations are defined in: El 4, A1653, Section 7 pb. ASME Section V, Article 7 ¢. API 650, Section 6.2.3 RAH d. ASME Section IV 653 Certification Renewal Quiz Question 14 of 25 28 Minutes Question 14: The tank material has allowable stress of 27,000 psi. The tank diameter is 165 ft. The tank height is 40 ft. The fluid specific gravity is 1.0. The joint efficiency is 1.0. What is the minimum thickness fequired of the bottom shell course? ‘a. 0-661 inches bp, 0.636 inches aang ¢, 0.644 inches ao d, 0-620 inches HPL GSO W $32 Required min & cf Skell porter sible 2 formutar ~ 2b OCH-Z)G ROH SHUO-1)AT ee a,ao xt, es Sd )E ) Ne Corriian Alnor Free A - abo CHD = ge 165K GO-) Ion (S68) 27, 0a x‘Weioeo Great Tas FoR O1 STORAGE 80 hhave one end rectangulae) shall have @ minimum nominal ‘width of 1200 mm (48 in). - 8.3.2 SHELL DESIGN ‘The required minimum thickness of shell plates shall be the greater ofthe values computed by the following formulas «| and the shell thickness shall not be less than the nominal plate thickness listed in 3.6.1.1 In STunits -| = 290 «4 = 4904-03) SB) design shel thickness (mm), iy = hydost tes shel hekess um, D = nominal diameter of tk (m) (62236..1), #1 = design igi lvl (6023632), © G = epee gaity of the iui tbe stored a speci fed by the purchase, teficeny, 0,085 oF 0.70 ee Table $4), . Corrosion allowance (nn) a specif by the purchaser (c03.32), Sy = allowable stress for the design condition (MPa) (se Table $2), 5; = allowable es fr byes st conden (MPa) (see Table S-2). 1wUS Cis wai: gu 2SDwNG', a ae oa 26DUH. (SME) where ta = design shel Wickes in), t= hydrostatic test shell thickness (in.), D = nominal diameter of tank (ft) (see 3.6.1.1), HY = design liquid level ( (see 3.63.2), © G = specie pavity of te gud to be stored, as spec fed by he puichase, E = jointetcieny, 10,085, or0.70 (ee Table $4), © CA = consion allowance i), a8 specie by the pur chaser (see 33.2), ‘Sg = allowable stress forthe design condition (bf7in2) (ee Table $-2), allowable stress for hydrostatic text condition (lbtfin2) (see Table S-2). Note: The allowable stresses recognize the increased toughness of ‘Sales steals over cazon soos and tho relatively low yildRensile ratios of the stainless stels. The increased toughness permits designing toa higher proportion of the yield strength, however, the ‘manufacturer and purchaser shall be aware that this may result in ‘permanent trsin (fee Table $2. s, S83 SHELL OPENINGS 8.3.3.1 The minimum nominal thickness of connections and openings shall be as follows: Minirum Nominal Slee of Nozzle ‘Neck Thickness NPS 2 and less edule 80S NPS 3 and NPS 4 ‘Sehele 408 Over NPS 4 6mm (025 in) Note: Reinforcement requirement of 3.7 must be maintained. $3.32. Thermal suess rlicf requirements of 3.74 are not applicable $3.33 Shell manholes shall be in conformance with 3.7.5 ‘except that the minimum thickness requirements shall be ‘multiplied by the greater of (a) the ratio of the material yield strength at 40°C (00°F) to the material yield strength at the design temperature, or (b) the ratio of 205 MPa (20,000 psi) to the material yield strenath tthe design temperature. 8.8.3.4 As an altemative © $3.33, plate ring flanges may be designed in accordance with API Standard 620 rules using, the allowable stresses given in Table S-3. $3.4 ROOF MANHOLES All stainless steel components of the roof manhole shall have a minimum thicknoss of 5 mm (fy in). S35 APPENDIX F—MODIFICATIONS S3.5.1 In Fé. and F5.1, tho value of 212 MPa (30,800 psi) shall be multiplied by the ratio of the material yield strength atthe design temperature to 220 MPa (32,000 psi. (ee Table $-5 for yield sength,) 8.3.5.2 In 7.1 the shell thickness shall be as specified in 8.3.2 except thatthe pressure P [in kPa (in. of water) divided by 986 (12G) shall be added to the design liquid height in meters (8). The maximum joint efficiency shall be 0.85. 8.353. In F72, the allowable compressive stress of 140 MBPs (20,000 psi) shall be multiplied by the ratio ofthe mate=653 Certification Renewal Quiz Question Question 15 of 25 Time Remaining: 228 Minutes 415: A tank constructed of ASTM 285 Grade C material is to be hydrotested. Inspection has found several of the bottom shell course plates generally corroded. The shell courses are 8 feet high. The minimum measured shell thickness is 0.7 inces in the bottom shell course. The original shell thickness of the corroded shell plates was 1.000 inches. The tank is 40" high, 190 diameter. The original joint efficiency was 1.0. What is the maximum hydrostatic test height? Eg, 32.883 feet E45, 40.000 feet Eg, 36.768 feet Eg, 37.842 feet 653 Certification Renewal Quiz Question 16 of 25 Time Remaining: 226 Minutes Question 16: A locally thin area is found in a 10 year old tank. The thinned area is noad 6 inches high uniformly around the circumference of the tank, in the 3rd shell course from the bottom; 20 feet below the maximum liquid level. The tank was built to API 650 Eighth Edition requirements with RT done as required by The Basic Standard. The tank is 200 ft diameter and 40 ft 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? b, 0.257 inches c, 0-298 inches 4. 0.319 inchesof ‘Sheet No, 1 Engingering Chant App. 1506 (or. 802) Subject“Tra NSFECTION, REPAR, ALTERATION, AND RECONSTRLOTIN + , The authorized inspector shall visually oc otherwise {decide which vertical plane(s) in the area is likely to be the ‘most affected by corrosion. Profile Fneasurements shall be taken along each vertical plane for a distance, L. In the _plane(s), determine the lowest average thickness, f, averaged vera length of £, using at east five equally spaced measure- iments over length L. 4, Refer to 4.3.3.1 for miniraum permitted values for , and 4 tq. The additional loads in 43.3.4 shall also be considered, , The criteria for continued operation isas follows: i. The value 4) shall be greater than or equal 10 fin (SE 4.33 of 4.3.4, subject to verification ofall other load: a ings listed in 4.3.3.5; and ii, The value ty shall be greater than or equal to 60 percent ffs iil, Any comosion allowance required for service until the time of the next inspection shall be added 10 tyiy and @ percent of fie 43.2.2 Widely scatiered pits may be ignored provided thet: 1. No pit depth results in the remaining sbell chickness being less than one-half the minimum acceptable tank shell dhick- ness exclusive of the corosion allowance; and ' The sum of their dimensions along any vertical line does not exceed 2 in. in an in, length (see Figure 4-2). 4.33 Minimum Thickness Calculation for Welded ‘Tank Shell Nowe: In general, the minimum acceptable thickness (jy) for an cate shell couse is doterminedwsing 43.3.1) with H determined to te boon ofeach shell couse and the results used as a bass for {dging the suitability for continued service forthe tank. If locally thinned ares are idetiied orf specific reas ae investigated (such 1s fora shell noztleinstallton), the method of 4.33.1(0) may be ‘sed to complets the evalustion with HY detennined for that particn- lar loation, 4.3.31 The minimum acceptable shell plate thickness for continued service shall be determined by one or more of the ‘methods noted herein. These methods are limited to tanks with diameters equal to 200 ft or les. ‘a, When determining the minimum acceptable thickness for ‘an entire shell couse, ty is calculated as follows: 26 (H-1)DG i ban = or z ». When determining the minimum acceptable thickness for any other portions of a shell course (such as a locally thinned ‘rea or any other location of interest, ty is calculated 28 fol lows: where fix =the minimum acceptable thickness, in in. for each course as calculated from the above formule; however, ‘nin Shall not be loss than 0.1 in, for any tank course, ‘D =nominal diameter of tank, in ., Hl =height from the bottom of the shell course under con- sideration to the maximum liquid level when evaluat- ing an entire shell couse in f; or =hoight from the bottom of the length L (see 4.3.2.1) from the lowest point of the bottom of Lof the locally | © thinned area to the maximum liquid level, in f; or height from the lowest point within any location of interest tothe maximum liquid level in, eye G =bighost specific gravity ofthe contents, '§ = maximum allowable stress in Ibffin?; use the smaller ‘of 0.80 oF 0.4297 for bottom and second course; use the smaller of O.88Y or 0.4727 for all other courses. Allowable shell stesses are shown Table 41 for | o ‘materials listed inthe current and previous editions of API Sid 12C and Std 650. "Note: For econstructed tanks, 5 shall bein accordance withthe cur rent applicable standard Y =specified minimum yield strength of the plate; use 30,000 Ibffin if not known, Oh do dy Figure 4-2—Pit Measurement653 Certifica’ Question 17 n Renewal Q: of 25 | Time Remaining: 224 Minutes Question 17: The bottom shell course of a 40-foot-high x 200-foot-diameter A ANA 283/Grade C tank has thinned tea thickness of 0.70 inch, What is the maximum fill height for a hydrostatic test? 36.28ft b, 37.35ft 34.93ft d, 36.0ft 653 Certificat Question 1 Question 1 gaaan n Renewal Quiz 8 of 25 Time Remai \9: 223 Minutes .8: Roof support columns are being replaced in a tank. Some of the columns will be new rolled structural C sections. The minimum material requirement for the new rolled structural C sections is : ASTM A36 or A992 b. ASTMA7 ASTM A36 or ASTM A7 a, ASTM A36 or ASTM A 285-C 653 Certifi Question 19 Question 19: ication Renewal Quiz of 25 Time Remaining: 222 Minutes The attachment welds of new lap-welded shell patch plates shall be examined: Visually only. . By vacuum box and solution film aang s Visually and by either magnetic © particle or liquid penetrant. By either magnetic particle of liquid penetrant only. o 4,ome 26D -Y- MA Yield S- -T- M8 Tensile S =Y" 90 27000 =t".519 28545 <= Use smaller for: all other courses =Y" 88 26400 =t*.472 25960 <=Use smaller for: bottom & 2nd course Insert material stress value from API 58 Table 4-1 use the smaller of 0.88 or J.72T ior botom and second courses; 00] inset weld ont ffcioncy from API 658 Teble 42 insrt tank diameter int. [E20:70} rset minimum thickness of a locay tinned shel pat, bottom 2 shel courses -Y- MA Yield S- "MS Tensile S =Y".90 27000 =1".519 28545 <= Use smaller for: all other courses =" 88 26400 =t".472 25960 <=Use smaller for: bottom & 2nd course incert retrial stress value tram API 653 Table 4-1. use the smaller of 0.88Y or Jo.272T tor botom and sacond courses; insert wold jin efficiency rom API 653 Table 42 insert tank diameter inf. [[0:70}ncort minimum thicknoss of local thinned ehol plat, botiom 2 shell coure0s.27000 =t".519 28545 <= Use smaller for: all other courses 26400 =t'.472 25960 <=Use smaller for: bottom & 2nd course _|insert material stress value from API 653 Table 1 use the smaller of 0.88Y oF o.472T for botem and second courses: inser wold joint efictency trom AP| 853 Table 42 Insot tank amoter in E0770 Insert mirimum thickness ofa locally thinned shell plate, botiom 2 shel courses 27000 =t".519 26400 =t".472 25960 <=Use smaller for: bottom & 2nd course insort matoral stress value from API 653 Table 4-1 use the smaller of0.88Y or 0.472T tor botom and socond courses; Insert weld joint efficiency trom API 653 Table 42 insect tank dlamotr in tmin =| Insert rinimum thickness of a locally thinned shel pate, bottom 2 shall courses: oN pd ple yh ‘pete 6 653 Certification Renewal Quiz Question 22 of 25. Time Remainin: Question 22: oAaonn 16 Minutes The bottom shell course of a 40 ft high, 165 ft diameter tank has thinned to 0.520 inches thickness. The tank was built in 1975 to API 650, Sth Edition, butt type shell joints, and Basic Standard construction, The tank material is A283 C. What Is the maximum, hydrostatic test height? oe 25.32ft 27.798 < ae7on See Attached 26.79ft 653 Certification Renewal Quiz Question 23 of 25 Time Remaining: 215 Minutes Question 23: A thin area in the critical zone is to be repaired using a welded- anan on patch plate. The tank shell is of welded construction and 9.500 inches thick. What is the maximum thickness of the welded-on patch plate? saree areca 1/2 inch 3/8 inch DO To Sse ieee ca) A welded-on patch plate is not permitted for repairs in the critical zone.27000 =1".519 28545 <= Use smaller for: all other courses: 26400 =1'.472 25960 <=Use smaller for: bottom & 2nd course Insart material stress value from API 659 Table 4-1 use the smallr of 0.88Y or Jo.4727 for bottom and eecond courses; Insert weld joint efficiency from API 653 Table 4-2 incor tank later int. [E52052}insort minimum hckness o a ocay thinned shel pat, toto 2 shel courses 27000 =1".519 28545 <= Use smaller for: all other courses. 26400 =t".472 25960 <=Use smaller for: bottom & 2nd course Insert matoral stress valuo from API 653 Table 4-1 uso the smallor of 0.88Y or Jo.272 tor botom and second courses; Insert weld jin efficiency from API 653 Table 42 insert tank diameter in Insert minimum thickness of a locally thinned shel pato, bottom 2 shall courses, nel Sranoano 853 ing plate 10 be removed stall be completely removed by se8ms TOT OM patches, except for anks designed im 5:0 ‘gouging and grinding. 19.922 The existing reinforcing plat may Oe removed and 99. inforcing pate added except hat enforce plate Fepiacement i not permited on existing, relieved reais itis not known wheter the ase ther Many sessed relieved, then the ateraion shall mest the a FAP! Std 650, Section 3:74, Care must BE aed wen removing whe existing Tinos plate to certain the sil plat Beneath the rinfore plate. avi arora the peimeser of the reinoring and Texyeen he enforeing pate and neck of the FeneNT shall erwempltely removed by gouging and En “The new cerning plate shall be ia accordance with FEN 93K. 18 Tequied to maisin weld spacing Treas shaped reins Tersing plate may be used, See Figur 9-38). 19.02 The nisin penetration may be mene Of cxxting 9 tion ofthe shl coming he fing nd reinforcing ite, and ising the ete asserbly to he COTES clevation (see Figure 9-4). 993 Any components ofthe penetration (neck ange a8 99 cing pie) tat aren serviceable condition afer removal may be reused. a.i0 REPAIR OF TANK BOTTOMS ‘9.10.1. Repairing a Portion of Tank Bottoms ‘9,10.1.1 General Repair Requirements -Toe use of welded-on patch pies for epuiing = PORE of vtonnysoppstd tank botoms is peice ‘within the or vrs given i this eation and 9.10.12, ROS Figure are accetable details for welded-on patch Pees 4. ‘The minimum dimension for a welded on PHY plate that Sverape a bottom seam or existing. PAH 12 in. The orsed-on patch plate may be eeu, oB10N8» of polygonal ‘vith rounded comers wrt rcted-on path late smal than 12m in ATT ested if it equal to exceeds 6°. diet; it does Peery bottom seam itis nok paced fo partially aa me exating pate and it extends beyond Ihe corroded fotom area, if any, by at least 2 in vorldedon pach plates sal not be lad ove of «MERE ori that have global dishing, Hest dishing Teacept os allowed by 9.1011 @). etement of istortion restr than se Timi of Appendix B xe: Hh tan stl uodergsng. eames We aAUED of Nts d-on path pate may nt be advise ‘4. A-welded+on patch plats may be placed © mechanical ( a woes! eahing its nsupporet dimension C55 Seat of Fin. in ang ection tata in itis at acre thck as the existing bottoms and doos rot ‘overlap ‘Sharp remnant sea with API Sid 650, Appendix M, which shall have endeon path plats at Teast 78 in. thick. (Text deleted] \ a aa Thee pais ve perpanent pai subject © an EDINE faspection and maintenance Program 9.10.12 Repairs within the Critical Zone ‘the se of welded-on patch pts is permite four, ing a portion of tank bottoms within tritial zane ee 39 ina Postion) provided 9.1011 resents an the follow ing ditional requirements are me ‘4. Maximomn plate thickness for welded-on patch plates 2 eet al zone Mais and must mest We toughness ‘Rauizements of APLSt 650, Section 2.25 seen a weldd-on patch plat is within 6 of shell, the welded-on patch plate shall be tombstone shaped. The th ane tombstone shaped wolded-on pach Pa shall erst the shell-to-bottom joist st ‘approximately 90 degre. oainesinsretpais [Ot ovation. BEFORE RAISING soaseg peas Sant eapermet oat sees Lt ver pate Se ils. RFTER RAISING Figure o-4-—-Metnod fr Raising Stel Nozzles yom siancces ewer