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Professional Traini Training ng and Consultati Consultation on
API 653 PREPARATORY COURSE
Daily Exams
26'h upto 31 st August 2 0 0 6
AI-Khobar, Saudi Arabia
MR. HAS HASAN AN ATIYAH ATIYAH HAS HASAN AN ALGHAMDI SABle Saudi Arabia
Fl oor, Al -Su beael To wers. King Abdul Abdul aziz cor cor.. Pri Prince nce Falsal Falsal • T El (966) 3 8 8 76633 •
At-K At -K hobar. Sa Saud! ud! A ra rab b ia
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ion n Pro fes sion al Tr aining and Co nsultat io API 65 3 Preparatory August gust u pt o 31 11 Au
200
6, AI AI-- Khobar , Page 1 o f 13
FIN INA AL EXAM (CLOSED) Instructions:
Choose only one answer , wh ich ich you think is most appropriate. U se se the atta ched c hed an s wer wer sheet n answer ing ing the follo wing wing questions . sheet i i n
1.
2.
3.
The complete or partial remova l and replacement of more than The 12 inches of a vertical weld jo ining shell plates is considered a: (a) m inor alteration;
(b) minor repair ;
(c) major alteration;
(d) major repair .
A single film technique wa was s us used ed to make a radiograph using a the e area of Cobalt-50 source. source . The minimum permitted density in th i nterest is :
a.
4 .0
b. c. d.
1. 8
2 .0 1 .3
Cathodic Cathod ic protec protection tion is ach ach ieved by directi directing ng the flow of current f ro m:
a. b. c. d.
(
4.
A cathode to anode An anode to cathode Both installations are acceptable Neither of a and b
is a ch chan ange ge f r o m p revious operating condit ions i nvolving different propert ies of the stored product such as spec sp eci fic gravi ty o r corros iv i ty and / or differen differentt service conditions of temperature and / or pressure: (a ) Re-rati tin n g; (c) Repair Repair ;
r v-o
(b) Change i n service; (d) Reconstruction
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FINAL EXAM (CLOSED) (CLOSED) 5.
Describ ui d penetrant exam examination ination should be ibe e ho w a l i q ui performed i n orde orderr to det detec ectt discontinu ities which ar e open to t he surface.
Clean the part developer, r, apply t he penetrant, part,, ap p ly th e develope remove excess penetrant, i nspect th e part, clean th e part Cl e a n t he part, apply penetrant, remove e xcess penetrant , apply the devel developer, oper, inspect th e part, clean t he part Cle an th e part, apply t he developer, apply th e penetrant, inspect th e part, remove excess penetrant, clean t he part penetrant trant,, Cl e a n th e part, apply th e developer, apply the pene inspectt the part, clea n t h e part inspec
a. b. c. d.
6.
7.
A ra rad d iograph ic t ec echnique hnique in wh ich radiation passed thr through ough two iographic viewed wed on t he sam wall wa lls s and both t he walls are vie same e radi radiogra ograph ph (double wall , double image - ellipse) t he l imitation f or th e outside d ia m e te ter r is :
a.
3-1/2 "
b.
2"
c.
4"
d.
An y d iameter poss ible
I n formation n eeded when d etermin in g th e hat e o f corros ion:
(
O r i g i n a l th ickness o r la last st inspection thickness Cu rr e n t t h ickness Le ngth o f t ime in i n service A ll th e above
a. b.
c. d. 8.
The ma ma ximum acceptable un und d ercutting r econstructed tank for hori horizonta zonta l welds i s: (a )
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1 / 64"; 6 4";
(b ) 1 / 32";
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(c)) 1/16"; (c
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metal
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FINAL EXAM (CLOSED) 9.
T an k was insp ected in 1985 and th e thickness was observed to be 0.32 inch. The thickness observed during inspection in 1995 was 0 .30 inch. What is corrosion rate? a. b. c. d.
10 .
2 mpy 20 mp y 0.2 mp y 1 mpy
remain ing corrosion allowance (RCA) at present is 0.05 inch, the ne xt thickness inspecti on due fo r above tank sha ll not be later than:
If
a. b.
10 years 15 years 6 years 12.5 years
c. d. 11.
A corroded area of a tank bottom plate is repaired by welding overlay. There is no change in th e rating and no change is made on the nameplate . Which of th e following is the correct term to describe t his process?
a.
Reconstruction Repair Alteration None of t he above
b.
c. d. 12 .
The ma ximum interval between internal inspections shall no t exceed yea rs when corros ion rate is kno wn:
__
(a) 10 ; 13 .
(b) 20;
(c ) 5 ;
(d ) 15.
Hot taps are no t permitted under which of th e following cond it ions?
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Page 4 of 13
FINAL EXAM (CLOSED) a. b. c. d. 14 .
On plates requ iring PWHT. On ultrasonically sound plate On tan ks w it h dia. more than 80 feet. None of the above.
A tank of 160 ft diameter is to be checked for shell settlement. Minimum number of equally spaced settlement p oi nt s to be checked will be:
a.
16 20 24 12
b.
c. d.
15.
For a tank made by reconstruction, under what circumstances maya new shell-to-bottom weld be e x empt from hydrostatic testing?
a. b. c. d.
16 .
In atmospheric conditions, bottom coatings may be applied if the steel temperature is:
a. b. c. -,
When the root pass has been visually inspected and the final weld is fully examined, visually and rad iographically. Reconstructed tank is never exempted from hydrostatic testing. , When the root pass has been visually inspected and the final weld is fully examined, visually and by vacuum box. When the w elding method has been reviewed and approved by an engineer experienced in tank design in accordance with API Standard 650.
2°F above t he dew point 5°F below the dew point . 10°F above the dew point.
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FINA L EXAM (CLOSED) d. 17.
At the dew point.
Procedure qualiflcation fo r welding during repair of tanks is done in accordance with: a. b. c. d.
18 .
AWS 01.1 API 1104 ASME Section I X All of th e above
Widely scattered pits ma y be ignored under th e following cond itions Where th e service fluid is corrosive or hard to hold. If sum of pi t lengths along any 8" vertical line does not exceed 2" When no pit has depth which resu lts in th e mi n imum thic kness being less than one-half th e min imum acceptable thi ckness of th e shell plate exclusive of corrosion allo wance band c
a. b. c. d. 19.
For ve rification of radiographic sensit ivity and quali ty , wh ich of th e followi ng are used:
a. b. c. d.
(
20.
image
Cassettes Penetrameters Cameras Coll imato rs
Internal corrosion in th e vapour space above liquid leve l occurs due t o:
a. b. c. d.
Hydrogen Sul phide vapo ur Wa te r vapour Oxygen Any combination of th e above three
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FINAL EXAM (CLOSED) 21.
API 650: Appendix M provides requirements fo r Tanks designed to operate at the following range of temperatures: a. b. c. d.
22.
Exceeding 260°C Above 90 ° - 260°C Below 90°C Below OOC
For a reconstructed tank as per API 653 Verticality (out-o f plumbness) of to p of the shell shall not exceed , a. b. c. d.
23.
1/300 1/250 1/400 None
6" min 12 " min 18 " min 3" min
Hot tap can be performed on: a. b. c. d.
25.
total tank height total tank height total tank height the above
When lin ing is applied to bottom on inside of tank, the lining shall extend up the shell. a. b. c. d.
24.
of of of of
Vapour space in the shell On the roof In the shell below liquid level Anywhere on the tank
A radiograph was having dens it y near the penetrameter equal to 3.0. Hence the acceptable density range of the radiograph is: a. b. c.
1.7to4
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Page 7 of 13
FINAL EXAM (C LOSED) None of the 26.
The exam iner fo r conduc t ing magnetic particle test ing on the tan k welds shall be : Qualified as per ASNT Leve l II or Able to read Jagger-2 Qualif ied as per ASME Sec. V None of th e above
b. d. 27.
above
I n atmospheric cond it ions , tempe ratu re of at least:
a.
gr it
II I
blasting
can
be
done
at
2°F above th e dew point . 5°F below th e dew po int 5°F above the dew point At th e de w po int
b.
c. d. 28.
How many equal ly spaced measurements are requ ired for th e th ickness averaging technique? (b)S (a)2 (c) 4 (d)3
29 .
How many spe cimens must be used fo r impact tests f ro m a single t est coupon or t est locati on? (a ) 1
30.
Hydrostatic tests sha ll reconstructed ta n k .
( a) 2 31.
(d ) 4
(c) 3
(b ) 2
(b ) 8
be
held
hours
fo r
for
the
(d ) 72
(c) 24
In a rad iograph ic film of a weld, how is back scatter checked? (a) ( b)
By use of a pe netrame te r By f ilm density pn nu,
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2 61h upt c 31 "1 August
200 6.
65 3
Preparatory
AI-Khobar, K$A. Page 8 of 13
FINA L EXAM (CLOSED) (c) (d) 32 .
Using lead letter All of th e above
__ inch, it does
In general, if shell thickness does no t exceed not requ ire further assessment fo r br ittle fracture: (a ) 0.25
33 .
34 .
(b ) 0.75
Potential for according to:
brittle
(c ) 1.00
fracture
(a )
API 650 - 7 th edition
(b)
API 650 - latest edition
(c)
API 650 - 4 t h edition
(d )
None of th e above
(d ) 0.50
exists
fo r
tanks
constructed
Three types of e xternal inspections are : (a)
Scheduled, routine and llquld penetrant
(b )
Scheduled, routine and UT thickness
(c)
Scheduled out of service, routine and UT thickness
(d )
Unsched uled, rout ine and liquid penetrant
(
35 .
Welders qualifications shall expire as they do no t weld: (a)
With in a given process fo r a 6 month period
(b )
Using a given procedure fo r a 6 mon th period;
(c)
On a tank fo r 6 mo nths;
(d )
For a 3 month period.
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FI NAL 36.
37 .
38.
39.
EXAM (CLOSED)
What ar e penetrameters used for: (a )
A penetrameter is used for radiographic technique in that it serves as an image quality indicator
(b )
It
(c)
To check penetrant quality in PT inspection
(d )
To check weld penetration during welding
indicates th e magnetic properties of th e materials
Unless otherwise agreed to by th e purchaser, what is th e minimum nominal width of a shell plate? (a ) 36 inches
(b ) 48 inches
(c) 72 inches
(d ) 96 inches
"Each vertical weld must be rad iographed (either spot or full radiography) for the bottom shell course (i.e ., course no. 1) for all tanks constructed to current API 65 0 Basic Standard." This statement is: a.
False
b.
True
c.
Whe the r an y radiog raphy is requ ired or not depends on shell thickness.
d.
Depends on tank design Engineer's opinion
Accord ing to ASME Sec. I X, welding filler metals are grouped into groupings (based on their usability) as : (a ) P-numbers
(b ) F-numbers
(c) Z-numbers
(d ) ASTM spec.
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Page 10 of 13
FIN AL 40.
41.
42.
43 .
EXAM
(CLOSED)
When reviewing a rad iograph, a light image of the le tter B can be seen on the fil m w it h dark background . (a)
This is cause for rejection
(b)
This is no t cause for rejection
(c)
Th is is th e same as a light le tter B
(d)
An u nusual exposure
saf ety
hazard
existed
du ring
the
Which of th e following penetrant system is gene rally considered least sens itive?
a.
Water-washable - v isible dye
b.
Solvent removable - visible dye
c.
Wat er-washable - fluo rescent dye
d.
Post-emu lsification - vi sible dye
The nondestruct ive exam inat ion method to be used for a part icular i nspection should be determined by the: a.
Availabilit y of certified NDE examiners
b.
Leng t h of time since the last inspection
c.
Age of th e component to be inspected
d.
Ty pe, location, and or ie ntation of t he expected f laws
Out of the follow ing four options in LPT, most sens it ive results can be obtained by : a.
Visible penetrant - water washable
b.
Fluroscent pene trant - post emuls ifyi ng type
c.
Visible - solvent removable type
d.
Visible - post emulsifying type
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Page 11 of 13
FINAL EXA M (C LOSED) 44 .
A PQR was qualified in 5G position using a new welder. But production weld ing is to be done i n 2G position . Which of the following are app licable as a m in im um? a.
Both procedure and welde r shall be re-qua lified in 2G pos it ion . The qualified procedure can be used ,only welder needs to be re-qualified The we lder is qualified, but th e pro cedure needs re qua li fication Both procedure and welder need no t be re -qualified.
b. c. d. 45.
Minimum thickness evaluation may be conducted by ?
a.
Use of an external micrometer on ly Ult rasonic testing D.P. Check None of above
b.
c. b. 46.
For procedure qualification documentation:
a. (
WPS gives the procedure t est data and results of te nsile/bend test PQR gives ranges qualified by procedure t est . PQR gives procedure test data and WPS gives ranges qualified WPS and PQR both give test data and ranges qualified
b. c. d. 47 .
Identify corre ct sta tement from following:
a.
Tensile test for procedure qua lif ication is passed only if base metal failu re occurs at or above Specified Minimum Tensile Strength (SMTS) of base metal
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Page 12 of 13
FI NAL b.
EXAM (CLOSED)
Tensile test fo r procedure qualification is passed only if base metal failure occurs above SMTS of base metal
c.
Tensile test for procedure qualification is passed even
if
weld
metal failure occurs above 95 % of SMTS of base metal
None of the above
d. 48.
When using radiographs to qualify we lder, th e acceptance standards used are found in:
a. b.
ASME Section V ASME Section IX ASME Se ction VIII The referencing code
c. d. 49.
An RBI assessment can be used to alter the internal inspection strategy provided: RBI is performed considering likelihood of failure and consequ ence of failure. The RBI is fully documented. A t hird party conducts the RBI. Bot h and " b" above
a) b) c) d) 50 .
You are reviewing a WPQ fo r a welder. The test results indicate the fol lowing: a. b. c.
Satisfactory side bend Face bend satisfactory Visual sa tisfactory
Will th ese tests qual ify the welder?
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FI N AL
a. b. c. d.
2006 .
At- xhc ber. Page 13 or 13
EXAM (CLOSED)
Yes No, because bend tests are not correct type. Not enough information given No, because radiograp hy is essential fo r welder qua lification
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Consul ta t ion API 65 3 Preparatory uc tc 3 1 August 20 06 , Al- Khobar. KSA. 1 of 8
FINAL EXAM (OPEN) Instructions:
Choose only one answer , which you th in k is most appropriate. Use the attached answer sheet in answering the following questions.
1.
Exclusive of corrosion allowance, what is the minimum nominal thickness fo r all new construction bottom plates? a. b.
inch inch 3/16 inch 5/ 8 inch
c.
d. 2.
For shell horizontal joints, how many additional radiographs shall be taken for each 50 feet of horizontal joint, (not including those requ ired as per API 650) for welds made in existing plates during t he repa ir? a. b.
c. d.
3.
The recommended minimum development time (penetrant testing) allowed for a material made of high temperature alloy is: a. b. c. d.
4.
1 2 3 4
5 min 10 min 7 min 60 min
Select suitable hole type (source side) penetrameter fo r following weld joint: Weld reinf.
= 118" th k
7/8"
th k
Backing strip = 3116" th k
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FINAL EXAM (OPE N) a) b)
c) d)
5.
No. 20 No. 25 No. 30 None of the above
type of penetrameter is Q.1 is changed to wire type what shall be the wire designation (wire decimeter in inch)
If
a. b. c. d. 6.
For steel plates and weld to be checked LPI, what shall be the penetration t ime fo r penetrant a. b. c. d.
7.
10 min for weld, 5 min for plate 5 min for both 10 min for both 5 min for weld, 10 min fo r plate
After apply ing t he dry developer the examiner checked fou r welds for surface defects after following period, weld A- after 5 minute, weld B after 10 minute, weld C was checked after 30 minutes and weld Dafter 65 minutes which of the weld were checked wrongly
a. b. c. d. 8.
0.025 (No. 10) 0.016 (No.8) 0.032 (No. 11) None of the above
Weld Weld Weld Weld
A and B C and D D only A and D
Following combination of base metal and welding electrode was qualified by a certa in PQR... impact testing is not required. Base Metal =SA 285 GrC Plates, Welding electrode = AWS E 6015
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FINAL EXA M
(OPEN)
This PQR will qualify which of the following combination of base metal- weld ing electrodes. a. b. c. d. 9.
1" th k SA 515Gr 60 plates, E 6013 electrodes 1 rhk SA 285 GrC plates, E 6013 electrodes 1 th k plates SA 516Gr70, E 7018 electrodes None of the above
For MT examination by prod tech niques the spacing between prods shall be between a. b. c. d.
4 inch 4 inch 3 inch 3 inch
to to to to
12 inch 10 inch 10 inch 8 inch
10. For a tan k with 130 ft diameter t hickness of top course wor ked out was t d=5mm t t=4mm. What will be minimum nominal t hickness provided for this course according to API 650 for a new tan k? a. b. c. d.
3/ 16" (5mm) 1/ 4 " (6mm) 5/16" (8mm) None of the above
11. Fo r a tan k with diamet er 100ft was found to have thic kness reduction in a localized area. Min imum thic kness observed (t2) was 1 inch. What will be the critical vertical length of fo r the area? a. b. c. d.
Fleer.
40 inches 37 inches 45 inches None of the above
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FINAL EXAM (O PEN) 12. On a tank roof plate two corroded areas was observed at locations A and B for location A, average thickness = 0.085 inches, area = 105 in2 Location B, average thickness = 0.095 inches, Area = 105 in2 your decision will be: a. b. c. d.
Both A and B are within limits Location A is OK, location B is art of limits Both A and B are out of limits Location B in OK, location A is out of l imits
13. Hot tap connection is to be made on tank w ith following description shell plate thickness = inch. Design temperature = 30°F the plates were not tested for impact testing, (Consr. Code API 650-1974) . What will be the ma ximum size of tapping connection? a. b. c. d.
8 inches NPS 6 inches NPS 10 inches NPS 4 inches NPS
14. A replacement plate to be used on a shell thickness of 5/8 inch, on the second course of the ta nk. Thickness of firs t course and th ird course is also 5/8 inch . Following 3 plates are available which one is most suitable to be used as replacement plate. a. b. c. d.
Pla te thic kness =
Plate thic kness = 5/8" Plate th ickness = 1/2" Plate th ickn ess = 1"
15. A t ank is having remaining corrosion allowance of 2.5mm and corrosion rate of the shell is O.lmm per year. What will be inspection interval fo r ne xt ultrasonic thickness inspection from outs ide of the tank ?
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Page 5 of a
FINAL EXAM (O PEN) a. b. c. d.
15 Years 12.5 Years 10 Years 5 Years
16. Typica l corroded areas on a shell plate are exhibited below in figure 1 with measured thickness in inches ind icated on th e sketch. The uri-corroded thickness of th e shell plate is 0.750 inches and C.A is 0.125 "
Figure 1 AREA
.65
0.66 0 .7 2
0.54
AREA
0.75 0 .7 2
AREA
0.75
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and Consu lt ation API 6 53 Prepar atory 26 lh u pto 31 11 August 20 06, AI-K hobar. KSA.
Page 6 of 8
FINAL EXAM (OPEN) The total length of a arrow line drawn is 8 inches. The length of the line in each of the corroded areas A, 6 and Care 1.5", 0.8" and 0.5 inches respectively. Comment on t he acceptability of the corroded condition. a.
The pitting can be ignored as a case of widely scattered pitting as both pitting depth and dimensions are w ithin lim its
b.
Not acceptable as size are not OK, total length of the pi t dimensions is more than permitted
c.
The pitting can be ignored as a case of widely scattered pitting since depth are OK
d.
The pitt ing cannot be ignored as a case of widely scattered pitting since depth are not OK
17. Two plates samp le A and 6 were tested for longitudinal impact testing. Following were results observed. They belonged to Group No. I as per API 650: Results of impact test for sample A were 18ft Ib, 8ft Ib, 16ft lb. Results on sample '6': 12ft Ib, 14ft Ib, 20 ft. Ib Your assessment will be: a. b. c. d.
sample sample samp le sample
A and 6 both OK A and B both to be r e-t ested 6 is OK, A shall be re -tested a is OK, 6 shall be re-tested
18. For replacement t o an existing 0.25" t hick shell plate of an AST, another plate of 0.25" thickness to ASTM A36 is used. What should be the minimum clear distance between the outer edges of the adjacent bu t t welds of vertical and ho rizontal joints, respect ively?
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FI NA L
a. c.
10" & 6" 6" & 3" 8" & 4"
d.
12" & 6"
b.
EXAM (O PEN)
19 . Repair of a 5/8 " thick shell , using lapped (lap welded) patch plate of 1/8 " thick was carri ed out, without informing t he Owner . Such a repai r is not acceptable as per API standard 653, because: a. b. c.
Owner had no t specified use of patch plate repairs Lap patch plate of less than 3/16" is not permitted Lap patch plate repair on shell thickness more than above is not permitted All of above
d. 20 .
As per API Standard 650, th e offs et between vertical seams of adjacent shells shal l be a min imum distance of :
a.
b. c. ,
d.
\
21.
5 t , where 't ' is th e plate t hickness of th icker shell course at th e offset 4t, where 't' is th e plate thic kness of thicker shell course at th e offset 3 t , where ' t ' is th e plate t hickness of t hicker she ll cou rse at th e offset 2 t, where ' t' is th e plate thickness of thicker shell course at the offset
When butt welded a nnular bottom plates are used, in an AST bu il t to API Standard 650, the ir width from ins ide of th e shell shall be at least:
a. b. c. d.
900 m m 3 00 mm 60 0 mm None of th e above
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FI NA L 22.
(OPEN)
Misalignment in a completed 20 mm thick vertical seam of an AST built to API Standard 650 shall be more than: a. b.
c. d. 23 .
EXA M
2 mm 1.5 mm 0.8 mm 3 mm
Ou t of roundness measured as deviation from radius measured 1 foot above th e bottom corner weld of alSO ft diameter AST built to API Standard 650 , shall no t exceed:
a. b.
c.
(2 5 mm) (12.7 mm) (1 9 mm) 1-1/ 4 " (3 2 mm)
d. 24 . Local dev iations from theoretical shape of an aboveground storage tan k (AST), built to API Standard 650, specifically at v ert ical joints or " Banding" at ho r izontal weld shall join ts as measured over an appropria te sweepboard of not exceed:
a. b.
c. d.
19 m m (3/ 4") 13 m m (1/2") 16 mm (5/8") 1/8 mm
25. An AST has remaining corrosion allowance of 3.2 mm. The known rate of corrosion of shell is 200 microns per year. As per API Sta ndard 65 3 , when should th e external v isual inspection
by an Authorized Inspector shall be carried out at an interval not exceeding: a. b. c. d.
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Page 1 of 5
DAILY Note:
EXAM 5 (CLOSED)
Encircle the letter of only one alternative which you think is most appropr iate,
Guided bend test represents: a, b. c. d. 2,
Ductility of weld Strength of weld Soundness of weld Both soundness and ductility of weld
All positions of groove welds are qualified by pipe positions lG and 5G pipe positions 2G and 5G pipe position 6G only band c
a, b. c. d. 3.
According to ASME Sec, IX, A welder for SMAW can be qualified by follow ing minimum tests: a. b. c. d.
4.
1 2 2 1
Procedure Qualification Record is a document which can be revised time to time . a, b, d.
5.
tensile and 2 bend tests bend tests only tensile tests and 1 bend tests tensile and 1 rad iography
True False Depends on company policy Depends on client of the company
Use of Radiography is made f or : a, b. c.
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DAILY EXAM 5 (CLOSED) Use of Radiography is no t permitted
d. 6.
Procedure Qualification is done by: a. b. c. d.
7.
1 Tensile and 2 bend tests 1 tensile and 1radiography 1 bend test and 1 radiography 2 Tensile and 4 bend tests
Which of th e following represent grouping of weld-metals in ASME IX? a. b. c. d.
8.
Sec. IX.
P- Nos F - Nos S - Nos A - Nos
For A 516 gr 60 (SMTS = 60000 psi) material, following results were obtained fo r two tensile test specimens in PQR qualification. Specimen T1: failed in B.M. at
psi
Specimen T2: failed in weld metal, at 59,500 psi Your assessment is:
9.
a. b.
PQR test is ok since both are w ithi n acceptance cr iteria PQR test is rejected as both T1 and T2 are no t within
c. d.
acceptance criteria PQR in rejected because T1 is ok bu t T2 has failed PQR in rejected because T1 is fai led thoughT2 is ok
Based on a measured cor rosion of 0.006" annually and using a corrosion allowance of 0.120", what is the interval fo r the ne xt UT th ickness measurements on shell are requ ired fo r AST? (a)
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DAILY EXAM 5 (CLOSED) 6.5 years 20 years 15 years
(b) (c) (d)
10.
11.
12.
13.
Per API 650, calculation of shell thickness by the 1-foot method cannot be used for tanks : (a)
Under 200 ft. in diameter
(b )
Over 200 ft. in diamete r
(c)
Under 150 ft. in diameter
(d)
Of any size
Impressed current system results compared t o Galvanic System.
in
a.
Can be used for large structures
b.
Maintenance cost is lower
c.
Installat ion is cheaper and easier
d.
No ex ternal power supp ly req uired
follow ing
advantages
Power source fo r impressed cur rent sys tem sha ll be checked at intervals no t exceed ing: a.
Annually
b.
Six months
c.
Two mo nths
d.
Fiv e yea rs
Thick fil m lining means th ickness: a.
Greater t han 10 mils
b.
Equal or greater t han 20 mils
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Page 40f5
DAILY EXAM 5 (CLOSED) c.
Greater than 20 mils
d.
Equal or greater than 10 mils
Sand blasting and painting operations shall no t be performed hum idity exceeds:
14.
15.
a.
90 %
b.
80 %
c.
85 %
d.
95 %
Which of the following statement is correct? a.
b. c.
d. 16.
if
Soil resistiv ity is a measure of resistance offered by soil to drilling operat ion fo r oil exploration and it has no connection with corrosivity of soil. Lower soil resistivity indicates less corrosive soil. Soil resistivity has nothing to do with corrosive ness of soil because soil corrosion depends on the amount of corrosive chem icals present in the soil . Higher soil resistivity indicates less corrosive soil.
The preferred method fo r inspecting non-metallic coating is: a. b. c. d.
b-" Hotn ,
Visual inspection only Holiday detection M.P. check D.P. check
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DAILY EXAM 5 (CLOSED) The accuracy of a piece of magnetizing equipment that is equipped wit h an ammeter shall be verified:
17.
a. b. c. d. 18 .
is decided to carryout a surface NDT fo r austenitic 5.5. welds. Choose a best combination. It
a. b. c. d. 19.
Penetrant testing with Halogen free developer Penetrant testing with any aqueous developer Magnetic particle testing with we t particles . Magnetic particle testing with dr y particles
In ultrasonic testing, for thickness measurement on corroded surface, use: a. b. c. d.
20 .
Each year Each tw o years When possible Every 6 months
CRT read ou t Digital read out Any of above None of above
For which of the following can yoke technique be used? a. b. c. d.
Sub-surface cracks Surface cracks Both a and b For none of a and b
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DAILY EXAM 4 (CLOSED) Note : En cir cl e th e le tt e r of o nl y one alterna t i v e wh i ch y o u t h ink i s mos t a ppro pr i a te.
A hydrostatic test fo r a relocated tank:
1.
May be wai ved by th e Owner/Operator Is required May be wai ved by th e Inspector I s no t necessary
c. d.
Minimum th ickness of tank bottom in critical zone shall be at least 0.1 inch bu t also it shall be:
2.
Greater of : V 2 t min for lowest shell course and half of orig inal thickness in critical zone tmin fo r lowest shell course and half of Smal ler of : or iginal thic kness in cr it ical zone 0.1" only 0.05" as from Table 6-1, if leak detection system . is provided
a.
c. d.
During the hydrostatic test, no less than measurement points shal l be surveyed.
3.
settlement
8
c.
10 15
d.
5
b.
For vacuum box test, a part ial vacuum of at least be used using to check th e cracks.
4.
3 5 3 5
b. d.
L'
no o-
. e
psi, psi, psi , psi,
shall
penetrating oil water immersion film sol ut ion liquid pene tran t
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Aug us t 20 0 61 AI-K hobar , KSA. P a ge 2 of 5
DAILY EXAM 4 (CLOSED) 5.
6.
Which tests are usually conducted to verify acceptability of shell to bottom plate . a.
Penetrating oil .
b.
RT
c.
Vacuum box test "a" and " c"
Except fo r cast iron parts , internal coils and supports may be: Dye penetrant tested Leak tested Hammer tested Magnetic particle tested
a b. d. 7.
At the ne xt out-of-service inspection on a tank that has had a hot tap performed, the visual inspection should include: Size of t he ho t tap nozzle holes Thickness of the plate at the hot ta p Height of the hot tap from the tank bottom Trimming of the hot tap nozzle holes
a. b. c.
8.
The term a. b.
Tanks with a b reathe r device installed on the roof High octane fuel tanks (Dome roof tanks) Tanks with floating roofs (open top-tanks) Tanks with internal floating roof
d. 9.
drain" is applicable fo r which type of tanks?
Industry experience and laborato ry test have shown that a membrane stress in tank shell plates of at least is required to cause failure due to brittle fracture?
a. b.
50 0
c.
7 ksi 18 kg / m m 2
d.
10 0
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DAILY EXAM 4 (CLOSED) 10.
Which of th e following is an advantage of magnetic particle testing over penetrant testing? a.
can detect surface discontinuities with foreign material imbedded in them It is faster on individual parts It can detect near-surface discontinuities All of th e above it
b. c. d. 11.
Which of th e following types of discontinuities is no t normally detected by radiography? a. b.
Cracks Incomplete penetration Lam inations Slag
d. 12.
The reason fo r periodical inspection of ASTs is to : a. b. c.
13.
Determine their physical condition Determ ine th e rate of deterioration Maintain safe operating conditions All of th e above
Resistance of grounding connection shall no t be,
b. c. d.
Hoot . c:
more than 25 Ohms less than 1 Meg-Ohm less than 25 Ohms more than 5 Ohms
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DAILY EXAM 3 (OPEN) N ot e:
1.
Tick only one alternative which you thin k is most appropriate.
Typical corroded areas on a shell plate are exhibited below in Figure 1 with measured thickness in inches indicated on the sketch. The m inimum required thickness of the shell plate is 0 .750" and C.A. required is 0.15".
..
Figure 1 0.65 X
AREA "A"
0.66 x
x 0 .72
xO .54
AREA "S"
x 0.75 x 0.72 x 0.66
AREA "C"
x 0 .75 0.72
The t otal length of a rrow line dra wn is 8 inches. The length of the line in each of the corroded areas A, Band Care 1.5", 0.3" and 0 .2" respectively. Comment on the acceptability of the corroded condition. Acceptable Not acceptable Conduct a patch plate repair The pitting can be ignored as a case of widely scattered pitting
b. c. d.
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DAILY EXAM 3 (OPEN) What i s th e minimum th ickness recorded? a.
3.
c.
0.315 " 0.315" 0.275" 0 .330"
d.
all o f th e above
Calculate th e critical L dimension f o r this cond ition
L -; 9 .7 "
b.
4.
l
c.
12 "
d.
All o f th e above
For the same conditions o f Figure 2 i f th e location o f the bottom o f th e cr it ical length is 2 feet from the tank floor and th e designed l iqu iquid id he ight is 12 f eet what i s th e value o f H in th e formula fo r calculating t min? 3 feet 15 f ee t 10 f eet 13 feet
a. b.
I
d. 5.
Find th e v alue of S w hich may ma y be assumed fo r th e lo lowe we r cou course rse o f old tank fo r cal alcula culatt ing t min considering th e fact that th e material is A516 g r 70 . 30,000 18 , 0 0 0 23,995 23,595
b.
c. d.
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DAILY EXAM 3 (OPEN)
Solution The pits are acceptable if:
Q1.
Thickness at bottom of pit (e xcluding Sum of dimensions in 8" lenqth s 2"
a. b.
tmin.; and
In the examp le, a.
The minimum thickness at bottom of the p it = 0.54" The th ickness C.A. = 0.54 - 0.15 = 0.39" V2 t mln This thickness 0 .39" (0.75), i.e. , 0.39" 0.375" -- -------- OK
b.
Total sum = 1.5 +0.3 + 0 .2 = 2" - - - - - - - - - OK
ANSWER: A
Q2.
Minimum thickness (t z) = 0 .275 ANSWER: B
Q3.
=
L=
x 0.275
= 9.7
ANSWER : A
Q4.
li q uid height = 12 ' H = 12 ' - 2' = 10'
ANSWER :
S'
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DAI LY
EXAM
August 2006. AI-Khobar; Page l o f 2
3 (OPEN)
Solution Q5.
Refer Table 4 -1 S
= 30,000 psi
ANSWER: A
Q6.
Consider the value for: Y = 30,000 psi
and
T = 55,000 psi Refer Table 4- 1 ANSWER: B
Q7.
The total of thicknesses taken on plane D works ou t to = 2.595" which is smallest of all planes A, B, C, and D. ANSWER : D
Q8.
Value of
tl
=
2.73/7
= 0.371"
ANSWER: D
Q9.
The thickness is more than 0.09" - - - - - - - OK
ANSWER: B
Q10. ANSWER : B Q11. ANSWER: B Q12. ANSWER: B
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Page l of 6
DAILY EXAM 2 (CLOSED) Note:
1.
Encircle the letter of only one answer which you think is most appropriate .
Maximum design internal pressure in an AST referred to by API 650 and API 653 is:
b. c. d. 2.
As pe r API 65 0 , the design metal temperature of an AST is based on th e lowest one-day mean temperature in th e locality where the tank is installed, it is: a.
c. d.
3.
above the lowest one day mean temperature of the locality 8° C above the lowest one day mean temperature of the locality Same as t he lowest one day mean temperature of the locality 5° C below the lowest one day mean temperature of the loca lity 15°C
nominal In an AST built to API Standard 650, th e t hickness of bottom plates , exclusive of specified corrosion allowance shall be: a.
b. .,c , d.
4.
Not exceeding 2.5 psig 15 psig approximately Not exceeding 5.00 psig None of the above
12.7 mm (1/2") 8 mm (5/16") 6.0 mm (1/4") 5 mm (3/16")
The fu ll course width fo r shell plate as per API 650 shall be minimum: 72 " b.
96 "
c.
60 "
d.
90"
.
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August 20 06. At-K hober , KS A.
P age 2 o f6
DAILY 5.
The addition of man-ways and nozzles greater than NPS 12 Increase and decrease in tank shell height Replacement of damaged flange on nozzle by flange of same size and material All of the above
d.
In accordance with API Standard 653, Repairs and Alteration have been defined as distinct activities. Activity which entails any work necessary to maintain or restore a tank to a condition suitable fo r safe operation. State which of the following activities does not constitute repair? a. b.
Re-Ieveling and/or jacking of a tank shell, bottom or roof Addition of reinforcing plate/s to existing shell penetratlon/s Changing the content with higher specific gravity Repair of flaws, such as tears or gouges, by grinding followed by welding
7.
In accordance w ith API Standard 653, Critical Zone fo r repairs to a tank bottom is that portion which is:
a.
Measured vertically upwards along shell, within 6" of tank bottom Measured radially inward, within 3" of the inside edge of shell Measured rad ially outward within 1 of outside edge of shell A circular area measurable radially wi t hin 12" from center of tank bottom
c.
d.
8.
2 (CLOSED)
In accordance with API Standard 653, Repairs and Alteration have been defined as distinct act ivities. State which of the following activities does not constitute an Alteration?
a. b.
6.
EXAM
Normally the corrosion rates of the tank bottom control the inspection interval, which are based on the actual or anticipated rates of corrosion. In the case of a tank, where corrosion rates are no t known, and where similar service experience is not :. a
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Au g ust 2 0 06, AI - Khob ar , K SA. Pag e 3 of 6
DA ILY EXAM 2 (CLOSED) available, th e actual thickness of th e bottom is to be determined by due inspections within: a. b. d. 9.
In case of the follow ing cond itions, th e risk of failure by brittle fracture in an AST built to API Standards is minimal: a.
c. d.
10.
Tank shell thickness 5/ 8" and shell metal temperatures at 20°F and above Tank shell thickness and shell metal temperatures at 60°F and above Tank shell thickness 3 / 4" and shell metal temperatures at 32°F and above Tank shell thickness and shell metal temperatures at OaF and above
As per API Standard 653, a routine, in service, close visual external inspection of an aboveground storage tank CAST) shall be done, at an interval not exceeding: a.
d.
11.
20 years 5 years 10 years 2 years
One year Five years One month Te n years
As AST has a m ea sure d shell th ic kn ess of 0.75"; and it s minimum required thickness is OS'. The known rate of corrosion of shell is 5 mils per year. As per API Sta ndard 653, when shou ld the external visual inspection by an Authorized Inspector be carried out at an interval not exceeding ? a. c. d.
One year Five years Twelve and half years Ten years
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AP /6 S3 P repara to ry A ugu st 2 006 , Al - Kbober, K SA. P age 4 o f5
DA ILY EXAM 2 (CLOSED) 12.
An AST has a measured shell thickness of 0.75; and its minimum required thickness is 0.5". The rate of corrosion of shell is not known. As per API Standard 653, the external ultrasonic thickness measurement shall be carried out an interval not exceeding: a.
One year Five years Six & half years Ten years
c. d. 13.
An AST has a measured shell thic kness of 0.75"; and its' minimum required thic kness is 0.5 ". The known rate of corrosion of shell is 5 mils per year . As per API Standard 653, t he external ultrasonic th ickness measurement sha ll be carried ou t at an interval not exceeding:
a. b.
One yea r Twenty-five years Fifteen years Ten years
d. 14 .
Corrosion on the bottom side of floor plates in aboveground storage ta nks is aff ected most by: Composition of the contents stored in the tank < . Weldin g procedures used during constructi o n of t he ta nk The metal used for construction of th e t an k floor Soil charac ter istics directly underneath t he ta nk
a. b. c.
15.
arc strikes, gouges, or tears from temporary attac hments are identified, th ey:
If
b. c. d.
Must be evaluated on a case-by-case basis Must be repaired by welding w ith an appropriate repair pr ocedure Must be repaired by removing the plate area conta ining the scars and welding in a butt-welded patch Are acceptable, provided they are mo re than 2 feet from any wel d seam . raz z co r.
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Au g ust 2006 , A/- K hob ar, K5A. Page 6 o f 6
DAILY EXAM 2 (CLOSED) 21.
A corroded area of a tank bottom plate is filled -u p by welding overlay. There is no change in the rating and no change is made on the nameplate . Which of the follow ing is th e correct term to describe this process?
b. c. d. 22.
Repair Alterat ion Can be repair or alteration Neither repair or alteration
Under wh ich of the cond itio ns listed below is e xternal inspection of tank bottom plate pe rmitted to be done in lieu of interna l inspection?
b. c. d.
In cases where constructions size or other aspects allow e xt ernal access to the tan k bottom to determine plate thic kness. Externa l inspection to determine bottom plate th ickness is never permitted in lieu of internal inspection For tan ks made of materials wh ich have exce llent chemical resistance All of t he above.
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DAILY EXAM 2 (CLOSED) Answer Key
Q. No .
Answer
1 2 3 4 5 6 7 8 9 10
A B A C C B C B C B B C D
12 13 14 15 16 17 18 19 20 21 22 23 24 25
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API 6 53 API 650 , API 65 0 API 65 0 API 653 API 65 3 API 65 3 API653, API 653, API 65 3 API 653, API 653, API 65 3 , API 65 3 API 653,
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3 .3 2. 2 .9.3 3 .4.1 3. 4 .1 3 .1 3.15 3 .9 6.4.2.2 Flq. 5-2 & 5.3.4 & 5 .3.5 6 .3.1.2 6,3 .2 .1 6 .3.3.2 (a ) 6.3 .3.2 (b) 4.4.7.1 4 .3 .6 5.3.4 3.4 1. 2 3.4.3 3.15 3 .15 6. 5
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DAILY EXA M 1 ( OP EN) No te : Enc i rcl e th e l e t t er of onl y on e a n swer whic h y ou t hi nk is m os t approp r iate .
AST fabr icated to API 650 (Basic Standard) is normally designed no t to exceed an operating temperature of:
1.
a. b.
260 deg C 100 deg C 90 deg C 21 deg C
Minimum size of fi llet welds in the cons truction or repairs of an AST buil t to API Standard 650 is:
2.
a.
Higher of 6 mm (0.25 ") or half of t he th ickness of thinner plate jo i ned. Higher of 9 mm (0 .25 ") or one third of the thickness of thicker plate joined. Higher of 5 mm (0.1875 ") or one third of the th ickness of th inner plate jo ined . Lower of 6 mm (0 .25 ") or half of the th ickness of thinner , plate joined.
b.
d.
As per API Sta ndard 650, t he ove rlap at lap -w elded joi nts shall be at least five ti m es t he nominal th ickness of t he t hinner plate, but need no t exceed, ,
3.
a.
c.
d. 4.
fo r sing le-welded lap joints and fo r double welded lap jo ints for single-welded lap joints and fo r double welded lap j oints for single-w elded lap jo ints and fo r do uble welded lap j oints for sinql e- weided lap j oints and fo r double welded lap jo ints
Calculate by t he 1-Foot method th e design shell th ickness Td in inches, of the following description of tank built to API Standard 650: t or . Prm r e Fmsal Bin Fahd
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DAI LY EXAM 1 ( OPE N) H = Design liqu id level = 50 feet D = Nominal Tank Diameter = 18 0 feet G = Design Specific Gravity = 0.86 CA = Corrosion Allowance = O. 0625" Sd = Allowable stress in design condition, in psi Shell Material = ASTM A36M Td = design shell thickness , i nch(es) St = Allowable stress for hydrostatic test condition, in psi Tt = hydrostatic test shell thickness , inch(es). Where, Td = 2.6 D a b. c.
0.912" 0.850" 1" 0 .922"
d. 5.
Calculate by t he 1-Foot met hod the hydrostatic test shell t hickness Tt in inches, of th e above referred tank, when water is used fo r the test : Where, Tt = 2.6 D (H -1 ) St 0.935" 0.985" 1" 0.922"
a. b.
c. 6.
Max imum Reinforcement thic kness of vertical butt joints of a tan k shell plate of 28mm , of an AST built to API Standard 650 shall be: 5mm 2.4mm 1. 6mm 3mm
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DAILY EXAM 1 7.
8.
Full Partial Spot Nil
In an AST built to API Standard 650, the bottom annular plates have radial weld jo ints, and are single butt we lded with permanent back-up bar, in which case, the extent of radiographing radial joints shall be, One spot on 50% of radial joint One spot on 10% of radial joints Full radiography of all radial joints RT - Nil; only MT of 100% joints is adequate.
a. b. c. d. 9.
As per API Std. 650, personnel who perform and evaluate radiographic examinations (RT) shall have a minimum qualification as follows: a.
Shall Shall Shall Shall
c. d. 10.
(OPEN)
Vertical joints of a 28 mm thick shell of an AST built to API Std. 650 shall be radiographed to the extent as given below: a b. c. d.
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API 65 3 Preparatory August 2006 , AI-Khobar,KSA Page 30f4
have a visio n of Jaeger No.2 . be qualified as Level II of ASNT SNT-TC-1A not be color blind . have an experience of at least te n years in RT.
The minimum requir ed shell thickness of a Tank of 60 Meter diam eter ( 200 ft. diameter), bu il t to API Sta ndard 650, shall be: a. b. c.
Design shell thickness plus corrosion allowance Hydrostatic Test shell thickness 8 mm (5/16") G reate r o f a, b , c
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Page
DAI LY EXAM 1 11.
12.
(OPEN)
Determine whether impact testing is required for A516 gr 70 normalised plates 1 inch thic k, Design temp = 0 degree F (-18 deg ree C): a.
Not requ ired
c. d.
Required Depends on opinion of design eng ineer Depends on opinion of tank inspector
Which of the fol lowing sets of t he Transverse Charpy V-notch of ASTM A Impact Test Values of a fully killed 0.75 thick 516 gr 60 for a design metal temperature of -34 degree C, is acceptable as per API 6507 Plates are not normalized. a.
20 , 18, 24, 20 ,
c. d.
11, 12 Joules 24, 12 Joules 22, 10 10, 27 Joules
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API 653 Preparatory August 2006 , AI- Khobar, KSA 1 of 1
DAILY EXAM 1 (OPEN)
Answ er Key
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1 2 3 4 5 6 7 8 9 10 11 12
13 14 15 16 17 18 19 20 21
Ref.: API 65 0 , Ref . : API 650. Ref.: API 65 0 , Ref.: API 650. Ref .: API 65 0 Ref . : API 65 0 Ref . : API 650. Ref.: API 65 0 Ref . : API 65 0 Ref.: API 650. Ref. : API 65 0 Ref.: API 650 ,
C C
B A D
A A A B D
B B
1.1.1 3.1.3.3 3 .1.3 .5 3 .6.3 .2 (t d ) 3.6.3 .2 (t t) 5 .2 . 1. 5 6-1 Note 6 6.1.2.9 6. 1.3.2 3 .6.1.1 Tab le 2-3B & Fio. 2-1
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API 65 3 Preparatory August 2006, AI-Khobar,KSA
Page 10f4
BENCH MARK QU IZ 1.
Open-top type tanks (With floating roof) are typically adopted for storing petroleum products that are :
a. b. d. 2.
b. c.
Lower part of shell interior, which is welded to bottom Upper part of shell interior, which is we lded to roof Lower part of roof exterior, which is welded to shell Annular part of bottom interior, which is welded to shell
API 650 code is tank construction code fo r :
b. c.
4.
Atmospheric Storage tanks Tanks with pressure up to 15 psig Aboveground tanks including Refrigerated tanks All of above
The terms "Sketch plates" and "annular plates" refer to Plates in :
a. c.
Tan k roof Tank bottom Tank shell of above
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a .tqu s;
etc)
The term "Critical Zone" in storage tanks refers to:
a.
3.
Non -volatile Heavy distillates (e .g. Bitumen, Volatile All of above
53.
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API 65 3 Preparatory August 2006 , AI -Khobar,KSA Page 2 of 4
BEN CH MARK QUIZ Hydrostatic testing of tank shells is:
5.
c. d. 6.
Internal inspection of tanks during shut-down is essentially fo r inspection of:
a. c. d. 7.
c. d. 8.
.
roof bottom shell Nozzles
The shell Horizontal welds The shell vertica l welds Both a and b. are equally critical The roof welds
Cathodic protect ion is provided to tanks normally fo r guarding the:
a. b.
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Tank Tank Tank Tan k
During tank inspection, the inspector should be more strict while inspecting:
+
;
Basically water fill test Conducted at 1.1 t imes the static column pressure of product Conducted at 1.0 times the static column pressure of product Highest Pressure value of a, b, c above
The tank shell aga inst product corrosion The tank bottom aga inst product corrosion The bottom aqclnst corrosion Both band c
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Page 3 of 4
BENCH MARK QUIZ 9.
For th e new tan ks to be constructed to th e API 6S0-Basic Standard, radiography fo r shell butt-welds ls:
b. c.
10.
Optional and its e xtent depends on th e Joint efficiency used fo r design Optional and its extent depends on th e Plate thickness used fo r shell Mandatory and its extent depends on Joint efficiency used fo r design Mandatory and its e xtent depends on th e plate th ickness used fo r shell
" Vacuum box testing " is Typical testing, normally applied for: J
a. b. c. d.
Bottom welds Mandatory for shell welds, optional fo r bottom welds Mandatory for shell welds, optional fo r roof welds Pad testing
When t he tan k is emp ty , t he fl oating roof of open-top tank is
1 1.
a. b. d.
At its top -most pos it ion Resting on t he bottom Resting on th e legs May be at any locatlon
Since the t ank is ne it he r a pressure vessel, no r the piping, the welding procedures and welders for API 650 tanks are qualified as per:
12 .
a. b.
Ern.! r c - ? 0 0 (·
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BENCH MARK QUIZ Which of the following is/are mandatory appurtenances fo r Storage tanks?
13 .
a. J
c. d.
14.
Tan k leve l gauge Tank vents · Pressure guage Te mperature gauge / th e rmomete r
Hot tapping for the tanks are provided in:
a. c. 15.
Vapour space only Liquid space only Any of a or b Hot taps are not perm it ted fo r storage tanks .
API 650 covers:
b. c.
Cyli nd r ical, welded, above ground tanks on ly Cylindrical welded and riveted tan ks Cylindrical & rectangular, welded & riveted tanks Cylindrical & rectangular, aboveground and underground ta nks '
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