Professional Training and Consultation API 570 Preparatory Preparatory 3 – 8 Sep05, Al-Khobar, Saudi Arabia Page 1 of 4
DAILY EXAM 3B (OPEN) Note: Encircle the letter of only only one alternative which you think is most appropriate appropriate.
1.
The reco recom mmend mende ed down downst stre ream am limi limitt of circ circui uitt of an inje inject ctio ion n point is a minimum of: a)
b)
c)
d)
2.
!or !or e"te e"tern rnal al insp inspec ecti tion ons s for for poten potenti tial al co corr rros osio ion n under under insu insula lati tion on #$%&) on $lass 1 systems, the e"amination should include at least ''''''''''' percent of all suspect areas and ''''''''''' percent of all areas of damaged insulation: a) b) c) d)
*.
Second Seco nd chan change ge in flow flow dire direct ctio ion n pas pastt the the inje inject ctio ion n poi point nt,, or or 25 feet beyond the first change in flow direction whicheer is less Seco Se cond nd chan change ge in flow flow dire direct ctio ion n pas pastt the the inje inject ctio ion n poi point nt,, or or 25 feet beyond the first change in flow direction whicheer is greater Seco Se cond nd cha chang nge e in flo flow w dire direct ctio ion n past past the the inj injec ecti tion on poi point nt,, or 25 inch inche es beyo beyond nd the the fir first chang hange e in flo flow dir direc ecti tion on whicheer is less Seco Se cond nd chan change ge in flow flow dire direct ctio ion n pas pastt the the inje inject ctio ion n poi point nt,, or or 25 inches beyond the first change in flow direction whicheer is greater
5(, 5(, 5, 25,
5 ** 5( 1(
!or !or $las $lass s 2 pipi piping ng,, the the e"t e"tent ent of $%& $%& insp inspe ectio ctions ns o on n a syste ystem m operating at + 5 ! will be #as a minimum) of: °
a) b) c) d)
5 - o off dam damag age ed are areas as,, 5( 5( - of susp suspec ectt are areas as 5( - of of su suspec spectt are areas as,, ** ** - of of dam dama aged ged are areas as ** - dama damage ged d area areas, s, 5( - of susp suspe ect area areas s one of the aboe
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Professional Training and Consultation API 570 Preparatory Preparatory 3 – 8 Sep05, Al-Khobar, Saudi Arabia Page of 4
DAILY EXAM 3B (OPEN) .
&n the the 3ar 3arlo low w form formul ula a for for dete determ rmin inin ing g pipe pipe thi thic4 c4ne ness ss,, the the term term S6 stands for: a. b. c. d.
5.
9ete 9eterm rmin ine e the the line linear ar e"pan e"pansi sion on #in/1 #in/1(( (( ft) ft) of a carb carbon on stee steell pipe pipe between ( degrees ! and 5( degrees !. a. b. c. d.
;.
*.(6 *.*6 2.*6 *.1;6
per per per per
1(( 1(( 1(( 1((
ft ft ft ft
2(< 2(< long long car carbo bon n stee steell pipe pipe is is heat heated ed uni unifo form rmly ly to to 5( 5( degr degree ees s !. from ( degrees !. 9etermine its length length after heating. heating. a. b. c. d.
.
&nte &ntern rnal al desi design gn gage gage pres pressu sure re of the the pip pipe e in in psi psi 7res 7ressur sure e des desig ign n str stren engt gth h for for inte intern rnal al pres pressu sure re,, in in inc inche hes s llo llowa wabl ble e uni unitt str stres ess s at at the the desi design gn temp temper erat atur ure, e, in psi psi 8a"i 8a "imu mum m stra strain in at at the the aer aerag age e oper operat atin ing g temp temper erat atur ure, e, in in psi
2(.(5 .(52< 2(.2; .2;*< 2(.21(< 2(.25 .25(<
s per 7& 5(, in case of normal uniform corrosion, compared to other piping. The thic4ness measurements on ales: a.
b.
c.
8ust 8ust be rout routin inel ely y ta4 ta4en en at sa same me fre= fre=ue uenc ncy y whi while le inspecting, other piping components as ale thic4ness is less than other piping components 8ust 8ust be rout routin inel ely y ta4 ta4en en at twic twice e the the fre= fre=ue uenc ncy y as as oth other er piping components as ales are ery critical components and essential for reliable operation. re re not not rout routin inel ely y ta4e ta4en n unle unless ss unu unusu sual al c cor orro rosi sion on pat patte tern rn and thinning is obsered during sericing and repair.
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Professional Training and Consultation API 570 Preparatory Preparatory 3 – 8 Sep05, Al-Khobar, Saudi Arabia Page 3 of 4
DAILY EXAM 3B (OPEN) d.
0.
The %T thic4ness measurements for pipes at eleated temp temper erat atur ures es,, the the read readin ings gs gene genera rall lly y are are co corr rrec ecte ted d usin using g thic4ness correction tables, because the readings are normally a. b. c. d.
.
igher th than ac actual th thic4ness >ower than actual thic4ness Temp Temper erat atur ure e has has no effe ffect on the the %T %T re readin adings gs ?het ?hethe herr rea readi ding ngs s wil willl be be hig highe herr or or low lower er depe depend nds s on the %T e"aminer
$ert $ertai ain n are areas and and type types s of pipi piping ng syst syste ems are are pot potent entiall ially y mor more susceptible to corrosion under insulation. ?hich of the items listed is not susceptible to $%&@ a) b) c) d)
1(. 1(.
re re rou routi tine nely ly at twice twice the the fre= fre=ue uenc ncy y of of oth other er co comp mpon onen ents ts because ales are more e"pensie items compared to rest of the piping and must be more fre=uently chec4ed.
rea reas s e"p e"pos osed ed to mist mist o oer erAsp Aspra ray y fro from m coo cooli ling ng wate waterr tow tower ers s $arb $arbon on stee steell pipi piping ng sys syste tems ms tha thatt no norm rmal ally ly ope opera rate te inA inA serice aboe 25( degrees but are in intermittent serice 9ead 9eadle legs gs and and att attac achm hmen ents ts tha thatt prot protru rude de fro from m insu insula late ted d piping $arb $arbon on stee steell pipi piping ng sys syste tems ms,, oper operat atin ing g betw betwee een n 25( 25( degrees ! and ;(( degrees !
Bni Bniro ronm nmen enta tall crac crac4i 4ing ng of aust austen enit ite e stai stainl nles ess s stee steels ls is ca caus used ed many times by: a) b) c) d)
B"po B"posin sing g are areas as to high highAe Aelo locit city y and and high highAt Atur urbu bule lence nce stre stream ams s B"ce B"cess ssi ie e cyc cycli lic c str stres esse ses s tha thatt are are ofte often n er ery y low low B"po B"posur sure e to to chlor chlorid ides es from from sa salt lt wate water, r, washA washAup up wate water, r, etc. etc. $ree $reep p of the the mat mater eria iall by long long time time e"po e"posu sure re to high high temperature and stress AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABndAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
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Professional Training and Consultation API 570 Preparatory Preparatory 3 – 8 Sep05, Al-Khobar, Saudi Arabia Page 4 of 4
DAILY EXAM 3B (OPEN) ANSWER KEY
C. D. 1 2 * 5 ; 0 1( 11 12 1* 1 15 1; 1 10 1 2( 21 22 2* 2 25 2;
S?BE 9 $ 9 $ 9 $ AAAAAAAAAAAAA
C. D. 2 20 2 *( *1 *2 ** * *5 *; * *0 * ( 1 2 * 5 ; 0 5( 51 52
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S?BE
