1.
The The fol follo lowi wing ng data data is pres presen ente ted d for for a cla class ss 2 pip pipe, e, Thickness = 0.36 inch (after inspection) Corrosion rate = 10 mp !emaining life = 16 ears "hen is the ne#t thickness meas$rement inspection d$e% a. . c. d.
2.
lea lease se cal calc$ c$la late te rem remai aini ning ng cor corro rosi sion on all allow owan ance ce for for pip pipin ing g in -$estion 1 ao+e. a. . c. d.
3.
0.20 0.20 0.2' 0.2' 0.12 0.16 0.16
inc inch inc inch in inch inc inch
"hen will e the ne#t inspection sched$le from now on for e#ternal inspection for pipe in -.1% a. . c. d.
.
&fter ' ears &fter ears &fter 10 ears *one of the ao+e
10 ears ' ears ears none of the ao+e
The The pip pipe e in in -.1 -.1 ao+ ao+e e has has an ins$ ins$la late ted d area area of 200 200 s/. s/. ft. ft., whi which ch is e#posed to s$sceptile temperat$re and mist spra of cooling tower. &ccording to & 0, how m$ch of minim$m area is recommended for *T s$r+e for C d$ring e#ternal inspection% a. 100 100 s/$ s/$ar are e fee feett . 0 s/$a s/$are re feet feet c. 66 s/$a s/$are re fee feet d. 10 s/$are feet
.
& -! -! is to e /$a /$allifi ified $sin $sing g 4' 4' inc inch thic thick k tes test co$ co$pon. pon. t t can can /$alif thickness5 a. . c. d.
6.
14' to 1714 1416 to 4' 1416 to 1714 *one of the ao+e
The The reco recomm mmen ende ded d minim minim$m $m de+ de+el elop opme ment nt time time (e (ene netr tran antt Te Testin sting) g) allowed for a material made of high temperat$re temperat$re allo is5
a. . c. d. .
& radiograph was ha+ing densit near the penetrameter e/$al to 3.0. 8ence the acceptale densit range of the radiograph is5 a. . c. d.
'.
10 ear inter+al ear inter+al 3 ear inter+al *one of the ao+e
:or a certain *at$ral gas piping sstem, which is in 16 ears, it is estimated that it has remaining life Considering the stip$lation of & 0, which of the determine ma#im$m inter+al for ne#t proposed date meas$rement e#amination and +is$al e#amination% a. . c. d.
10.
1. to 2. to 3.9 2.0 to .0 *one of the ao+e
:or piping $ried in soil with resisti+it of 0007ohm cm and not cathodicall protected, e+al$ations of pipe thickness sho$ld e performed at5 a. . c. d.
9.
min 10 min min 6 min
operation for of 12 ears. following will for thickness
6 ears and ears respecti+el 3 ears and 10 ears respecti+el 10 ears and ears respecti+el 6 ears and 6 ears respecti+el
&n nspector finds incomplete penetration of 2mm in a radiograph of a girth weld of normal fl$id ser+ice piping 12 mm thick. Can he accept as per &;< >31.3% a. f the incomplete penetration is greater than 1 mm, re?ect. . f the incomplete penetration is more than 1 mm $t still less than 0.2 times pipe thickness, accept. c. epends on opinion of inspector d. !adiograph again and then decide on acceptance.
11.
@o$ are planning for the 8dro7test of a piping with 8dro test press$re 0Ag4cm 2g. The calirated test ga$ges a+ailale with o$ are 070 Ag4cm2g, 07100 Ag4cm2g, 1710 Ag4cm2g and 07200 Ag4cm2g. "hich two ga$ges are acceptale for this test% a.
07100 Ag4cm2g and 0710 Ag4cm2g
. c. d. 12.
"hat wo$ld o$ e#pect to happen if o$ were taking T readings on piping that was operated higher than 200 degrees :% a. . c. d.
13.
070 Ag4cm2g and 07100 Ag4cm2g 07100 Ag4cm2g and 07200 Ag4cm2g 070 Ag4cm2g and 07200 Ag4cm2g
The thickness readings co$ld e lower. The thickness readings wo$ld not e infl$enced. The thickness readings co$ld e ao$t 1B higher for each 100 degrees : rise of temperat$re. The thickness readings ma e higher or lower depending on co$plant.
& welded part is to e radiographed and is 1 thick, with 14' reinforcement. "hat &;T< wire set - sho$ld e $sed on these radiographs if a so$rce side techni/$e is $sed% a. . c. d.
1.
;et ;et ;et ;et
& > C
The doc$ment referenced in & 0 for determining fitness for ser+ice of piping sstem is5 a. . c. d.
& 9 & &;< > 31.1 *one of the ao+e
1. $ring impact testing of & 106 gr> (eo#idised) and &3 gr> pipes (non7deo#idised), following asored energ +al$es in ft7l were oser+ed5 & 106 gr> 5 12., 13. , 12 & 3 gr> 5 11, 11. , 9 @o$r assessment is5 a. . c. d.
>oth >oth Dnl Dnl
&106 and &3 are acceptale &106 and & 3 shall e re?ected &3 gr> can e accepted 106 gr> shall e accepted
16. & -! test was made on & 106 grade C pipe. This will /$alif which of the following sets of materials5 a. .
& 106 gr >, &36 , & 1'2 :1 & 10, &16 gr 60, &16 gr 0
c. d. 1.
1 gr 0, & 2' gr C, & 33 11 *one of the ao+e set is f$ll /$alified this -!.
Caron percentage cannot e detected #7ra fl$roscence method eca$se this method cannot detect materials5 a. . c. d.
1'.
Eighter than s$lpher 8ea+ier than s$lpher >lack in color "hich are radioacti+e
"hen a T test cannot e cond$cted etween 1072 degree C (0 degrees : F 12 degrees :) what m$st e done, as per &;< ;ec. G% a. . c. d.
& new proced$re m$st e /$alified $sing s$itale penetrant materials. The s$rface m$st e re7cleaned. The test cannot e cond$cted. se the dwell time for penetrant and de+eloper as per Tale in &rticle 6 of &;< ;ec. G.
19. & piping sstem is to e pne$maticall press$re tested. ts esign ress$re is 160 psig. The first stage press$ration, the test press$re and inspection press$re respecti+el will e5 a.
'0 psi, 16 psi, 160 psi 2 psi, 200 psi, 16psi 2 psi, 16 psi, 160 psi none of ao+e
b. c.
d.
20. ;elect s$itale 8ole tpe (so$rce side) penetrameter for following weld ?oint5
Weld reinf. = 1/8" thk
7/8"
H )
a. . c. d.
Backing strip = 3/16" thk
*o 20 *o 2 *o 30 *one of the ao+e
21.
f tpe of penetrameter in ao+e /$estion is changed to wire tpe what shall e the wire designation (wire decimeter in inch)% a. . c. d.
22.
:or steel plates and welds to e checked E, what shall e the penetration time for penetrant% a. . c. d.
23.
0.02 (*o. 10) 0.016 (*o. ') 0.032 (*o. 11) *one of the ao+e
10 min for weld, min for plate min for oth 10 min for oth min for weld, 10 min for plate
&fter appling the de+eloper the e#aminer checked fo$r welds for s$rface defects after following period, weld & F after min$te, weld > after 10 min$tes, weld C was checked after 30 min$tes and welds after 6 min$tes. "hich of the welds were checked wrongl% a."eld & ."eld C c."eld d."eld &
2.
and > and onl and
n a certain -! for ;<&", the electrodes $sed for all passes were of &"; classification ( 01'). Corresponding "; also showed filler materials as 01'. *ow the man$fact$rer proposes to change the filler material in "; to 01. "ill o$ ask man$fact$rer to5 a. . c. d.
-$alif new -! with 01 electrodes. !e+ise onl "; showing the change from 01' to 01 and s$mit "; as a new re+ision. !e+ise onl the -! doc$ment showing the change and res$mit for appro+al. !e+ise oth "; and -! showing the change and res$mit for appro+al.
2.
&ct$al thickness meas$red at a T
26.
stimated rate of ;$lphidation corrosion for a cr$de handing e/$ipment d$e to s$lpher content of 0.B ( weight) at 600 0: is 10 mp. "hat will e the corrosion rate if s$lpher content is 1.0B weight% a. . c. d.
2.
appro#imatel appro#imatel appro#imatel appro#imatel
Caron steel with "8T Caron ;teel, $t "8T is not re/$ired Caron steels with /$enched and tempering treatment Consider se of *ickel allos.
Caron steel 1.2 Cr F 0.
n tpical refiner ser+ice, "8T of 2.2 Cr F 1
30.
mp mp mp mp
To a+oid 8T8&, s$ggest s$itale materials of constr$ction for hdrogen ser+ice with partial press$re of hdrogen = 100psi, and temperat$re = '000: a. . c. d.
29.
10 12 1 20
;$ggest s$itale constr$ction materials for ca$stic ser+ice ha+ing 0B *a08 concentration ( weight) operating at 20 0: a. . c. d.
2'.
0. inch 0.3 inch 0.2' inch *one of the ao+e
8igher than 21 >rinell Eower than 21 >rinell 8igher than 22 >rinell Eower than 22 >rinell
"hile oser+ing radiographic film for weld with ;<&" process showed indication of following description. & localiHed darker
densit with f$HH edges in the center of the width of weld image. This indication most likel represents5 a. . c. d.
#cessi+e penetration Eack of penetration Cl$ster porosit >$rn thro$gh
SOLUTION Q.1
!emaining life = 16 ears Thickness meas$rement inter+al = J remaining life or 10 ears K $se lower (!ef.5 & 056.3 and Tale 671) &nswer5 a (!ef.5 .1.1 of & 0)
Q.2
!emaining C.&.
= !emaining life # Corrosion rate = 16 # 10 = 160 mils sa 0.16
&nswer5 d (!ef5 .1.1 of & 0)
Q.3
&nswer5 c
(!ef.5 Tale 671)
Q.4
&nswer5 c
(!ef.5 Tale 672)
Q.5
&nswer5 d (!ef.5 &;< ;ec. L, Tale 1.1) -$alified thickness is 3416 to 1 M
Q.6
Tale in &rt. 6 of &;< ;ec. G shows de+elopment time of 10 min$tes for all materials. &nswer5
Q.7
&;< ;ec. G, &rt. 2. ensit +ariation in 71B to N30B &nswer5
Q.8
!ef.5 Tale 971 of & 0 &nswer5 a
Q.9
*at$ral gas is Class 2 fl$id (!ef.5 6.2.2 of & 0) !efer Tale 671 of & 0 &nswer5 a
Q.10 !efer Tale 31.3.2, pages and ' from &;< >31.3
ncomplete penetration permitted is 1mm for letter > for normal fl$id, girth weld. &nswer5 a
Q.11 !efer &;< ;ec. G (Eeak Testing F &rt. 10). The range for press$re ga$ges is5
0 to 1 J times 0 to times
(minim$m range) (ma#im$m range)
for gi+en e#ample, 0 F 60 (minim$m) and 0 F 160 ma#im$m &nswer5 a Q.12 !efer ;79 from ;ection G. !efer paragraph no. '.
&nswer5 c Q.13 !efer &rt. 2, &;< ;ec. G. - is on so$rce side. "e need wire no. 9 for thickness=1 "ire no. 9 will e in ;et >.
&nswer5
Q.14 !ef. ;ection 2 of & 0 age 271
&nswer5 a
Q.15 :or deo#idiHed steel (&106 gr>, T.; = 60,000 psi) &+erage re/$ired = 13 ft l, min 10 ft l for one. :or non7deo#idised steel (&3 gr>, T.; = 60,000 psi) &+erage re/$ired 10 ft4l and min for one = ft l
&+erage for &106 gr> =
&+erage for &3 gr> =
12.5 + 13.5 + 12 3
11 + 11.5 + 9 3
= 12. O 13
= 10. P 10 ft l
31.3, page )
Q.16 & 106 grC pipe elongs to *o. 1 material. ;o it will /$alif onl *o. 1 materials. & 10, & 16 gr60 and &16 gr0 are *o. 1 materials. !efer Tale -"722 from &;< ;ec. L.
&nswer5 Q.17 !efer & ! ', paragraph .2.1
&nswer5 a
Q.18 !efer dwell time tale in &rt. 6, &;< ;ec. G. ;ee the note elow the tale.
&nswer5 a
Q.19 !efer &;< >31.3, age '6, 3.
&nswer5 c
Q.20 !efer &;< ;ec. G, &rt. 2 !efer Tale for selection of - !e/$ired - is *o. 2.
&nswer5
Q.21 !efer &;< ;ec. G, &rt. 2. !e/$ired wire is no. 9.
&nswer5 d
Q.22 !efer dwell time in &rt. 6 of &;< ;ec. G.
&nswer5 d
Q.23 !efer &rt. 6, &;< ;ec. G F nterpretation
nterpretation shall e etween mins to 60 mins &nswer5 d
Q.24 !efer &;< ;ec. L F Tale for : *os. 01' and 01' are oth : *o. = ;o same -! is DA. Dnl re+ise ";.
&nswer5 Q.25 !efer & 0 age 72 for <&" thickness $sed shall e &ct$al Thickness min$s twice the corrosion loss $p to ne#t inspection.
0. F 2 # 0.01 # 6 = 0.2' inch &nswer5 c Q.26.!efer to & 1 :ig. F 66.
&nswer is5 > Q.27.!efer to & 1 :ig. F '.
&nswer is5 Q.28.!efer to & 1 :ig. F 3.
&nswer is5 C Q.29.!efer to & Tale 11.
&nswer is5 & Q.30.!efer to !adiographic :ilm, :ig$re 3', & .
&nswer is5
777777777777777777777777777777777777nd7777777777777777777777777777777777
