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 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 firs firstt chan change ge in flow flow dire direct ctio ion n 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 $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
&n the the /ar /arlo low w form formul ula a for for dete determ rmin inin ing g pipe pipe thi thic0 c0ne ness ss,, the the term term S stands for: 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 3res 3ressur 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 4llo 4llowa wabl ble e uni unitt str stres ess s at at the the desi design gn temp temper erat atur ure, e, in in psi psi a"i a "imu mum m str strai ain n at the the ae aera rage ge oper operat atin ing g tem tempe pera ratu ture re,, in in psi
5.
6etermine the linear e"pansion #in71(( ft) of a carbon steel pipe between ( degrees ! and 5( degrees !. a. b. c. d.
9.
1(( 1(( 1(( 1((
ft ft ft ft
2(.(52 2(.29* 2(.21( 2(.25(
4s per 43& 5(, in case of normal uniform corrosion, compared to other piping. The thic0ness measurements on ales: a.
b.
c.
d.
<.
per per per per
4 2( long carbon steel pipe is heated uniformly to 5( degrees !. from ( degrees !. 6etermine its length after heating. a. b. c. d.
.
*.( *.*8 2.8* *.19
ust be routinely ta0en at same fre;uency while inspecting, other piping components as ale thic0ness is less than other piping components ust be routinely ta0en at twice the fre;uency as other piping components as ales are ery critical components and essential for reliable operation. 4re not routinely ta0en unless unusual corrosion pattern and thinning is obsered during sericing and repair. 4re routinely at twice the fre;uency of other components because ales are more e"pensie items compared to rest of the piping and must be more fre;uently chec0ed.
The %T thic0ness measurements for pipes at eleated temperatures, the readings generally are corrected using thic0ness correction tables, because the readings are normally a. b. c. d.
=igher than actual thic0ness >ower than actual thic0ness Temperature has no effect on the %T readings ?hether readings will be higher or lower depends on the %T e"aminers s0ill
8.
$ertain areas and types of piping systems are potentially more susceptible to corrosion under insulation. ?hich of the items listed is not susceptible to $%&@ a) b) c) d)
1(.
4reas e"posed to mist oerAspray from cooling water towers $arbon steel piping systems that normally operate inA serice aboe 25( degrees but are in intermittent serice 6eadlegs and attachments that protrude from insulated piping $arbon steel piping systems, operating between 25( degrees ! and 9(( degrees !
Bnironmental crac0ing of austenite stainless steels is caused many times by: a) b) c) d)
B"posing areas to highAelocity and highAturbulence streams B"cessie cyclic stresses that are often ery low B"posure to chlorides from salt water, washAup water, etc. $reep of the material by long time e"posure to high temperature and stress AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABndAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
ANSWER KEY
C. D. 1 2 * 5 9 < 8 1(
4S?BE 4 4 6 $ 6 4 $ 4 6 $
C. D. 2 2< 28 *( *1 *2 ** * *5 *9
4S?BE
