API 510 QUESTIONS & ANSWERS (CLOSED 1) Instructions:
Choose only one answer, which you think is most appropriate. Use the attached answer sheet in answering the following questions.
1.
Post weld heat treatment of vessel welds generally results in: a. b. c. d.
2.
A pres pressu sure re ve vess ssel el fab fabri rica cate ted d in 1!" 1!" was was in in serv servic ice. e. It It has has been been deci decide ded d to remo remove ve the the top top head head and and e#te e#tend nd the the heig height ht and and replace the dish head with a new one. $he proposal is: a. b. c. d.
%.
$he pro proposal can can be ac accepted for rev review by authorised inspector No mo modifi difica cati tio on is is a all llo owed on on th this ve vesse sell A pr pressure ve vessel en e ngineer should be be consulted for approval None of the above
&essels that are 'nown to have a remaining life of over (((((((((( years or that are protected against e#ternal corro co rrosio sion n need need no nott have have insula insulatio tion n remov removed ed for the perio periodic dic e#ternal inspection. a. b. c. d.
*.
Reduction in in ha hardness Increase of of te tensile st strength Incre crease of bo both stre trengt ngth an and du ductili tilitty None of the above
1" 1) ) 2"
After an inspection interval is completed and if calculations indicate that an inaccurate rate of corrosion has been assumed initially+ how do you determine the corrosion rate for the ne#t inspection period, a. b. c. d.
ec' the original calculations to to find out what the error is in the original assumption. -nless th the co corrosion ra rate is is ch changed by by u urisdiction+ th the initial rates shall be used. $he corrosion rate shall be ad/us /usted to agree with the actual rate found. 0all in a corrosion specialist
API 510 QUESTIONS & ANSWERS (CLOSED 1) ).
If a vessel is made up of un'nown materials and computations must be made to determine the AP what can the inspector or the vessel engineer do to establish the AP, a.
!.
b.
Assume 30 as 4A 25% 6r. 0 and /oint efficiency 7 ".8
c.
$he vessel made of the un'nown material must be removed from service and vessel of 'nown material must be installed.
d.
$he vessel of un'nown material shall be sub/ected to hydrostatic tests while having strain gages on it to determine its yield strength and thus allowable stress.
R9I assessment can be used to alter the inspection strategy provided: a. b. c. d.
8.
c. d.
0ooler dry locations. &ery cold locations with year round temperature less than 2);< armer+ wet locations armer dry locations
4oil=to=air >4?A@ interfaces for partially buried vessels are a location where localied corrosion may ta'e place. If the buried part is e#cavated for inspection+ how deep should the e#cavation be to determine if there is hidden damage, a. b. c. d.
.
$he degradation methods are identified and evaluated $he R9I is fully documented. A third party conducts the R9I 9oth A and 9 above
hat climatic area may reuire a very active program for corrosion under insulation, a. b.
5.
$he lowest grade material and highest /oint efficiency in the applicable code may be assumed for calculations.
12 to 15 inches ! to 12 inches 12 to 2* inches ! to 15 inches
2 0ommon way to minimie temper embrittlement is to limit a.
BC factor for weld metal.
API 510 QUESTIONS & ANSWERS (CLOSED 1) b. c. d. 1".
$he minimum hydro test temperature for in=service vessel of 2F thic'ness is: a. b. c. d.
11.
°
° °
1 2 % All *
hat type of repairs and procedures may the inspector give prior general authorisation to continue >provided the inspector is satisfied with the competency of the repair organiation@, a. b. c. d.
1*.
°
inimum Gesign thic'ness for a vessel shell is 1" mm.
1%.
G$H1" < G$H%" < G$H " 0 G$H " 0
0lam shellF type crac' failure having concentric rings called beach mar'sF showing wavesF of crac' propagation is typically the description of a. b. c. d.
12.
BDC factor for base metal. BC factor for base E BDC factor for weld metal. BDC factor for base E BC factor for weld metal
a/or repairs and minor procedures Limited or routine repairs a/or alterations and re=ratings inor re=ratings and alterations
A vessel in service has different ones of corrosion. $he ne#t inspection freuency will be decided by: a. b.
Mone with highest rate of corrosion Mone with lowest remaining life
API 510 QUESTIONS & ANSWERS (CLOSED 1) c. d. 1).
Resistance to sulphidation is generally achieved by a. b. c. d.
1!.
b. c. d.
3#ygen ater >i.e., et J24@ 4ulphur a and c above
$he lea' tightness of the relief valves is tested on the test bloc' at a pressure eual to: a. b. c. d.
2".
Jydrogen blistering near liuid level Jydrogen blistering on top dished head Jydrogen blistering near the bottom of vessel None of above
J24 is in sour crude is more harmful in presence of: a. b. c. d.
1.
$ransgranular+ branching and aggravated by increasing temperature Intergranular and unidirectional >straight@ and aggravated al low temperature Independent of chloride content None of the above
In planning for an internal inspection of a vertical vessel that has acidic corrodents+ what type of corrosion would you e#pect to find on the vessel shell from inside, a. b. c. d.
15.
-pgrading to higher nic'el alloys -pgrading to higher chromium alloys -pgrading to higher copper based alloys All of the above.
0haracteristic 400 in Austenitic 4.4. generally will be a.
18.
Average rate of corrosion shall be ta'en into consideration Average remaining life of the vessel shall be considered
4ame as set pressure " of the set pressure 4ame as reseat pressure None of the above
$he principal reason for inspecting a pressure relief device is to determine:
API 510 QUESTIONS & ANSWERS (CLOSED 1) a. b. c. d. 21.
hich of the following tests must be conducted on a valve as soon as it has been received in the shop for inspection, a. b. c. d.
22.
d.
&alve testing on test benches in shop Application of rupture discs $raining reuirements for mechanics involved in inspection and repair of pressure relieving devices All of the above
2*.
&isual inspection Jydrotesting of valve body Radiographic testing 0hec' set=pressure
API )8! does not address: a. b. c.
2%.
0ondition of pressure relief device and if it is functioning properly $he remaining life of pressure relief device. $he spring coil diameter. $he body thic'ness.
At the anchor bolts in the foundation At the Points of contact of the metal surface with the concrete All of the above None of the above
Inspection records contain the following information for a $L on a dished head. >$h'. in inches@ 3n the basis of this information+ the long=term corrosion rate for the location is: Thickness ".)"" ".*2) ".*"" a. b. c. d.
Year " ) 1"
1 O mils per year ) mils per year 1" mils per year 1"" mils per year
API 510 QUESTIONS & ANSWERS (CLOSED 1) 2).
A certain 0. 4. vessel which reuired impact testing was reuired to have PJ$ initially according to code reuirement. After 1" years when repaired by welding PJ$ is to be carried out. Performing PJ$ is found to be impracticable. hich of the following is relevant >as per API=)1"@, a. b. c. d.
2!.
PJ$ may be e#empted+ if proper NGK is carried out. 0arry out temper=bead welding as alternative to PJ$. 0arry out both hydro=testing and pneumatic testing in lieu of the PJ$. 0arry out preheating to minimum 2"";<
A cylindrical shell with thic'ness 7 *."F+ IG7!F+ 47181"" and K7".5) and 0. A. 7 1?5F showed metal loss of 1?*F within the areas lying 5F on either side of the longitudinal welds. ou analysis of situation is: a. Recalculate shell thic'ness BtC minimum considering K71." b. $he thinned area is on or within weld area hence >a@ above can not be adopted c. Prepare repair procedure and restore the metal loss as per API =)1" d. b and c above
28.
aterials used for ma'ing repair by welding in carbon steel vessels shall have the following limitations, a. b. c. d.
25.
$hey shall meet the reuirements stipulated in NA0K 4tandard. $he carbon content shall not be over ".%) elding repair shall be done by using only the 6$A process All of the above
1" years 12.) years ) years None of above
API 510 QUESTIONS & ANSWERS (CLOSED 1) 2.
An ellipsoidal head has an internal diameter of 8! inches and depth of 21 inches >including a straight face dimension of 2 inches@. hat should its spherical >crown@ radius be, a. b. c. d.
%".
c. d. %1.
8!. inches 1).! inches !5.* inches All of the above
$he root and final pass of weld shall be radiographed. eld metal shall be deposited for second pass while the first pass below the second pass is still not cooled down and its cooling rate is retarded due to the heat of second pass. After depositing each layers of the weld+ the weld shall be P$ chec'ed. 9oth b and c
0alculate the remaining life and e#ternal insp. interval of a vessel given the following data: Actual thic'ness 7 ".)) inch inimum thic'ness reuired 7 ".8) inch $hic'ness at previous inspection ) years prior to present inspection 7 1."2) inch a. b. c. d.
%2.
2" years+ 1" years 1* years+ )years 25 years+ 1" years None of the above
As per API )1"+ the organiation who carry out PR& repair+ testing has to be: a. b. c. d.
Needs to be a certified company to perform all repair wor' in accordance to A4K. Needs to have have documented uality control procedure Needs to have ualified personnel to carry out the /ob within scope of repair 3nly b and c above
API 510 QUESTIONS & ANSWERS (CLOSED 1) %%.
A vessel which was inspected si# years ago and had shell thic'ness 7 ".58"F. As on today the thic'ness as reported by filed inspection is ".85!. hat was the corrosion rate over last si# years, a. b. c. d.
%*.
If the vessel in above uestion has minimum permissible thic'ness 7 ".!15F for the present design conditions. hat will be estimated remaining life of the vessel if corrosion rate remains same, a. b. c. d.
%).
11 ears+ ) ears 1" ears+ ) ears ) ears+ ) ears None of the above
hat is the ma#imum defect permitted on the conve# surface of a welder ualification bend test after bending, a. b. c. d.
%8.
1" years 12 years 1* years None of above
%!.
1" mpy 12 mpy 1* mpy none of above
inch 1?5 inch 1?1! inch %?1! inch
0ertification of contaminants shall be obtained for all P$ materials used on: a. b. c. d.
0arbon steels
API 510 QUESTIONS & ANSWERS (CLOSED 1) %5.
$he scope of the A4K 9oiler and Pressure &essel+ 0ode+ 4ection & includes: a. b. c. d.
%.
*".
NGK acceptance criteria Jow to perform NGK to achieve a desired result here to do NGK >i.e. what welds to e#amine@ All of above. for
magnetiing
euipment+
the
H) H1" H1) H2"
hich of the following are commonly preferred to 'now the process side degradation of pressure vessels, a. b. b. c.
3n Qstream inspection. Internal inspection K#ternal inspection as alternative to internal inspection Any of above is 3S
*1.
Prod 4pacing $hic'ness of item under Inspection a E b above None of above
hile deciding the governing thic'ness for crown portion for corroded 2:1 ellipsoidal head+ API )1" stipulates that E crown thic'ness shall be calculated: a. b. c. d.
According to relevant ellipsoidal dished head formula According to code formula for spherical heads with head radius eual to ". G+ where G is shell dia meter. $hic'ness of crown shall be same as 'nuc'le thic'ness. None of the above
API 510 QUESTIONS & ANSWERS (CLOSED 1) *%.
$=$@ 7 5"ft+ $he vessel AP is !" psi. inimum vessel part AP for bottom dished head >2:1 Kllip type@ shall be: a. b. c. d.
**.
Jow is hammer testing utilied, a. b. c. d.
*).
As a preliminary survey for thinned areas As a independent test method for which A4N$ 0ertification in NG$ is available As a important tool in the hands of the Authoried inspection only $o carry out 0arpy impact test
hich of the following represent grouping of weld=metals in A4K ID, a. b. c. d.
*!.
*.! psi 52.5 psi ).) psi None of above
P Q Nos. < Q Nos. 4 Q Nos. A Q Nos.
hich is?are advantage penetrant testing,
of
magnetic
particle
testing
over
a. It can detect surface discontinuities with foreign material imbedded in them. b. It is faster on individual parts. c. It can detect near=surface discontinuities. d. All of the above *8.
Gouble wall Gouble image techniue is used for the radiography of: a. b. c. d.
Plate welds $ubular products with outer diameter less than %.) inch Large pipes with outer diameter 2"" mm and above Jeavy castings
API 510 QUESTIONS & ANSWERS (CLOSED 1) *5.
As per A4K 4ec. &III Giv. 1+ if permanent deformation is observed due to over pressure during hydrotesting: a. b. c.
d. *.
$he sie of a properly deposited eual fillet weld is shown as 1" mm. $he throat dimension for this weld will be appro#imately: a. b. c. d.
)".
b. c. d.
0onduct R$ after *5 hours of observing the defective condition Noles and ad/acent shell areas should be inspected for distortion and crac'ing -se acoustic emission monitoring All of the above
Identify the correct statement >s@ a. b. c.
d. )2.
1" mm 5 mm 8 mm mm
If any setting is noticed on a vessel+ which of the following should be done: a.
)1.
$he inspector should as' for re=test using proper test pressure and new pressure gauges.
440 is aggravated due to wet J24 Jydrogen blistering may occur on I.G+ 3.G+ or any where within wall thic'ness of the pressure vessel. Jigh hardness E Jigh strength steels are more li'ely to undergo damage due to 400 compared to low strength? low hardness steels All of the above are correct statements
0rac's and laminations loo' similar from surface however+ generally: a. 0rac's run normal to vessels surfaces b. Lamination runs slant or parallel to surface c. a and b above
API 510 QUESTIONS & ANSWERS (CLOSED 1) d. None of above )%. typically a. b. c. d. )*.
Jigh temperature hydrogen attac' due to ethane gas formation et J24 formation $emper embrittlement Presence of molybdenum in alloy steels.
$he nonmetallic coating disbonding in a vessel can be better detected by: a. b. c. d.
)).
Kddy current testing Joliday detection -ltrasonic testing Acoustic emission testing K#ternal inspection of a pressure vessel starts with:
a. b. c. d. )!.
is
Ladder+ stairs+ wal'way and platforms of the vessel Insulation+ s'irt and foundation $he e#ternal surfaces+ of vessel Gimensional chec' of the vessel
9efore carrying out an inter service inspection on a vessel put in=service for uite some time what the inspector should do first, a. b.
0hec' the material in which it is constructed. 0hec' the permanent file of the vessel.
c. d.
0hec' the progressive history file of the vessel. 0hec' the original thic'ness report.