API 570 Sample 001 PRACTICE QUESTIONS ALL QUESTIONS ARE CLOSED BOOK
1)
A 14" 14" O.D. O.D. pip pipee has has a corr corrod oded ed area area on it. it. Wha Whatt is the the max maxim imum um siz sizee of a smal smalll repa repair ir patch that may be used to cover the corroded area a)
%)
*.#"
*.%64"
$"
d)
$."
b)
*.%$"
c)
*.!!4"
d)
*.%!$"
b)
*.!4!"
c)
*.$!1"
d)
*.%4"
b)
*.$#"
c)
*.$4%"
d)
*.$**
A 1*8 1*8 lon lon carb carbo on steel steel pip pipe is ,eld ,elded ed to to a 1*8 1 19 stai stainl nles esss pipe pipe and is is heat heated ed uniformly to 4# derees 3 from #* derees 3. Determine its total lenth after heatin a)
$)
c)
A &' &'( 14 +14 +14.** .**" od) od) seaml seamles esss pip pipe made made fro from A(0 A(0 A1* A1*$ $ 2rade 2rade A mat mater eria iall operates operates at !** psi and $** derees 3. 0he pipe must cross a small ditch and it must be capable of supportin itself ,ithout a visible sa. sa . A pipin enineer states that the pipe must be atleast *.!#" to support itself and the li-uid product. 7e also states s tates that a *.1%" corrosion allo,ance must be included. alculate the minimum re-uired thic5ness for the pipe. a)*.##"
)
#"
A &'( &'( $ +$.$ +$.$.% .%" " od) od) seaml seamles esss pip pipe mad made from from A(0 A(0 A!! A!! 2ra 2rad de '% mat mater eria iall operate operatess at ** psi and $** derees derees 3. 0he condit condition ionss re-uir re-uiree that that a corros corrosion ion allo,ance of *.1%" be maintained. alculate the minimum re-uired thic5ness for these conditions. a)
4)
b)
A &' &'( 4 (ched chedu ule * * +*. +*.!!#" !!#" ,al ,all) l) bra bran nch is is ,eld ,elded into into a &'( &'( 1% (ch (chedu edule 4* +*.4 +*.4*$ *$"" ,all ,all)) head header er.. What What size size cove coverr fill fillet et ,eld ,eld +tc) is re-ui re-uire red d over over the the full full penetration roove ,eld " +/xpress ans,er to nearest hundredth) a)
!)
!."
%*.*$#8
b)
%*.1$8
c)
%*.%!48
d)
%*.*68
A bla blan5 n5 is re-u re-uir ired ed bet, bet,ee een n t,o t,o &'( &'( 1*: 1*: !** !** lb. lb. class class flan flane es. s. 0h 0he maxi maxim mum pressure in the system is ! psi at %** derees 3. A corrosion allo,ance of *.1#" is re-uired. 0he inside diameter of the as5et surface surfa ce is 6.%". 0he blan5 is A(0 A1$ 2rade #* material ,ith no ,eld ;oint. alculate the pressure desin thic5ness re-uired for the blan5 a)
*.#6"
b)
*.$6%"
c)
*.$
d)
*.#$"
#)
A &'( &'( 14 +14 +14.**" od) seam eamless ess pipe made from A(0 A(0 A! 2rade < materi erial operates at $** psi $** derees 3. alculate the pressure desin thic5ness for these conditions. ' = %(/t D a) *.%4!" b) *.44%" c) *.%*" d) *.161"
)
A &'( &'( $ pipin ipin syst system em is insta install lled ed in Dece Decem mber ber 166. 66. 0he 0he inst instal alle led d thic thic5n 5nes esss is measured at *.#16". 0he minimum thic5ness of the pipe is *.4$". >t is inspected in December 1664 and the measured thic5ness is *.$*". An inspection in December 166 reveals a *.*%" loss from the December 1664 inspection. Durin December 166$: the thic5ness ,as measured to be *.#1". What is the lon9term corrosion rate of this system a) c)
6)
b) d)
*.*1% ?' year 1% ?' year
1 years
b)
.44 years
c)
1.% years
d)
$ years
1* years
b)
years
c)
! years
d)
%.#% years
A sea seaml mless ess &'( &'( 1* pip pipe: e: A(0 A(0 A1* A1*$ $ 2rade 2rade < mate materia riall opera operates tes at #* #* psi psi and and #** derees derees 3 maximum. maximum. onsiderin onsiderin only pressure desin thic5ness: ,hat minimum minimum thic5ness is re-uired a)
1!) 1!)
*.**1% ?' year *.1% ?' year
@sin @sin the the infor informat mation ion in in uesti uestions ons &o. 1* and and assum assumin in an an in;ect in;ection ion point point in in a lass lass % system ,ith # years estimated until the next inspection ,hat ,ould the next interval be a)
1%) 1%)
*.*%$#"?year *.*!4$"?year
@sin @sin the info inform rmati ation on in uest uestio ions ns &o. &o. and &o. &o. 6: dete determ rmin inee the rema remain inin in life life of the system a)
11) 11)
b) d)
@sin @sin the the data data in ues uesti tion on &o. &o. : : calc calcul ulat atee the shor shortt term term corr corros osio ion n rate rate in mil milss per year +?' year) a) c)
1*) 1*)
*.*166$"?year *.*%114"?year
*.%44"
b)
*.%**"
c)
*.%%
d)
*.1#!"
A seam seamle less ss &'( &'( 1$ pipe pipe:: A(0 A(0 A1! A1! 2rade 2rade A mate materia riall opera operates tes at * * psi psi and and $** derees 3 maximum. 0he thic5ness of the pipe as determined by the last inspection is *.4*". *.4*". 0he pipe has been in service for years. 0he oriinal oriinal thic5ness at installation installation ,as measure measured d to be *.44" *.44".. 0,o years years previo previous us to the *.4*" measureme measurement nt the thic5ness of the pipe ,as found to be *.4". Determine the reatest corrosion rate: i.e. short or lon term in mils per year +?' year) a) c)
?' year *.#* ?' year
b) d)
#* ?' year #** ?' year
14) 14)
A seam seamle less ss &'( &'( 1% pipe pipe:: A(0 A(0 A1*$ A1*$ 2rad 2radee < mater ateria iall opera operate tess at #* #* psi and and #** #** der derees ees 3 maxi maximu mum. m. 0he 0he thic thic5n 5ness ess of the the pipe pipe as dete determ rmin ined ed by the the last last inspection is *.!*". 0he pipe has been in service for 1! years. 0he oriinal thic5ness at insta install llati ation on ,as ,as measu measured red to be *.4* *.4*" ".. 0,o years years prev previo ious us to the the *.!* *.!*" " measu measure reme ment nt the the thic thic5n 5ness ess of the the pipe pipe foun found d to be *.!1 *.!1$" $".. 0he 0he next next plan planne ned d inspection is scheduled for years. @sin the appropriate corrosion rate determine ,hat AW' AW' the pipe ,ill ,ithstand at the end of the next inspection period a)
1)
$11 psi
d)
* psi
*.44$"
b)
*.!!%"
c)
*.%!1"
d)
*.1"
*.%6"
b)
*.16"
c)
*.!%"
d)
*.!6%
*.#$"
b)
*.61"
c)
*.66"
d)
*.$#"
An ins inspe pect ctor or find findss a thin thin area area in the the body body of a &'( &'( $: $** $** lb. ate ate val valve ve body body.. 0he 0he body is made from A(0 A%1$ W< material. materia l. 0he system operates at 6** psi and #* derees derees 3. @sin @sin a corros corrosion ion allo,an allo,ance ce of *.1%" *.1%":: ,hat ,hat minimu minimum m re-uir re-uired ed thic5ness must the valve body have to continue to safely operate +Bound to the nearest ! decimals) a)
16) 16)
c)
A &'( &'( 4 (che (ched dule ule * +*. +*.!!#" !!#" ,all ,all)) bran branch ch con connect nectio ion n is ,eld ,elded ed into into a &'( &'( $ (chedu (chedule le 4* +*.%* +*.%*"" ,all). ,all). A *.!#" *.!#" reinforcin reinforcin pad is used around around the branch branch connection. 0he fillet ,eld sizes are as re-uired by the ode. 0he branch connection is inserted into the header. 0he material of the branch and header is A(0 A$#% 2rade <#*. What thic5ness ,ould be used to determine ,hether heat treatment of the connection is re-uired +/xpress ans,er to nearest hundredth) a)
1) 1)
466 psi
A seamless seamless &'( &'( $: $: A(0 A(0 A1*$ 2rade 2rade A pipe pipe operat operates es at !** !** der derees ees 3 and and #41 #41 psi. psi. 0he allo,able allo,able stress is 1$:*** 1$:*** psi. 0he o,ner9user o,ner9user specified that the pipe must have *.1%" for corrosion allo,ance. @sin the
1#)
b)
A seamless seamless &'( &'( $: $: A(0 A(0 A1*$ 2rade 2rade A pipe pipe operat operates es at !** !** der derees ees 3 and and #$ #$ psi. psi. 0he allo,able stress is 1$:*** psi. @sin the
1$)
#%* psi
*.46%"
b)
*.$1#"
c)
*.1*"
d)
*.!4"
A sea seaml mles esss &'( 1* 1* pipe pipe:: A(0 A(0 A1* A1*$ $ 2rade 2rade < mate materia rial: l: oper operate atess at #* psi psi and and #** #** derees 3 +maximum). 0he thic5ness of the pipe as determined by the last inspection is *.!*". 0he pipe has been in service for 1* years. 0he oriinal thic5ness +measured ,hen ,hen instal installed led)) ,as *.!$" *.!$".. 0,o years years previo previous us to the *.!*" *.!*" measur measureme ement nt the thic5ness of the pipe ,as measured to be *.!1". Determine the reatest corrosion rate i.e. short or lon term a) c)
*.*** inches per year *.*1** inches per year
b) d)
*.**$ inches per year *.*1!* inches per year
%*) %*)
A sea seaml mless ess &'( &'( 1* pip pipe: e: A(0 A(0 A1* A1*$ $ 2rade 2rade < mate materia riall opera operates tes at #* #* psi psi and and #** derees 3 +maximum). 0he thic5ness of the pipe as determined by the last inspection is *.!*". 0he pipe has been in service for 1* years. 0he oriinal thic5ness +measured ,hen ,hen instal installed led)) ,as *.!$" *.!$".. 0,o years years previo previous us to the *.!*" *.!*" measur measureme ement nt the thic5ness of the pipe ,as measured to be *.!$". 0,o years previous to he *.!*" measurement the thic5ness of the pipe ,as measured to be *.!1". 0he next planned inspection is scheduled for # years. @sin the ,orst corrosion rate +short + short or lon term) determine ,hat pressure the pipe ,ill ,ithstand at the end of its next inspection period a)
6%* psi
b)
$$! psi
c)
11 psi
d)
#* psi
ANSWER KEY
1. %. !. 4. . $. . 6. 1*. 11. 1%. 1!. 14. 1. 1$. 1#. 1. 16. %*.
b d a c a b c d b d a b b d c b b b b
A'> #*: A'' #*: #.1.1 A'> #*: #.1.1 A'> #*: #.1.1 A'> #*: $.! #*: #.1.1 A'> #*: #.% #4: 6.% A'> #*: #.1 and #.% A'> #*: #.1 and #.%
API 570 Sample 001
