PWHT is required for all thicknesses of piping over ½ inch for which of the following materials? a. !. c. d.
.
Nos. Nos. Nos. Nos.
1 1 #
and and and and
" " $
NP% 1& %ch '( and %ch 1)( pipes *+.,.- / 1() gr 0 are to !e used at 21(3 -. 4etermine whether& a. !. c. d.
".
P P P P
0oth pipes require impact testing ,nl5 %ch 1)( will require impact test !ut %ch '( would !e e6empt. 0oth would !e e6empt %ch '( wo would re require !ut %ch 1)( wi will !e !e e6empt.
/ )7 )7 N0 N0 %ch %ch #( pipe pipe is se sele lect cted ed for for fol follo lowi wing ng co cond ndit itio ions ns.. 4esign Pr ")( psi 4esign Temp. "(( degrees 8 +.,.-. / $" gr 0 *9:W -orrosion /llowance .( mm /ssume standard mill tolerance ;our assessment is< a. !. c. d.
#.
Pipe de design me meets c co ode re requirement Pipe Pipe desi design gn does does no nott meet meet co code de requ requir ire ement ment 4epen pends on opinio inion n of Pip Pipin ing g =n =nspe specto ctor 4epe 4epend nds s o on n opin opinio ion n of Pipi Piping ng 4esi 4esign gn 9ngi 9ngine neer er
/ piping installation was constructed out of material requiring impact impact testing. testing. 8ollow 8ollowing ing two steel steel materials materials *material *material / and 0 were tested for impact test results. These materials are to !e used for repair work on piping. The test data is as follows<
Material A:
Material B:
%+T% )$((( psi *4eo6idi>ed :eading for specimen *1 1).( ft l! :eading for specimen * 1.$ ft l! :eading for specimen *" @.$ ft l!
%+T% )(&((( psi *4eo6idi>ed :eading for specimen *1 1$.( ft l! :eading for specimen * 1#.( ft l! :eading for specimen *" 1(.( ft l!
a. !. c. d. $.
/n austentic stainless steel piping s5stem operates !etween temperatures of 2 $( o8 and "$(o8 .The temperature of installation was 1(( o8. The appro6imate values of minimum e6pansion and contraction range for sliding support installed at 1$( ft from the anchored end will respectivel5 !e< a. !. c. d.
).
' mm 1( mm 1 mm 1# mm
/ 1() gr 0 pipe after installation& required H5drostatic leak test. 8ollowing data is presented 4esign pr "(( psi& 4esign temp $((38. -onsidering stress at design as well as am!ient temperature& determine correct h5drotest pressure if test is carried out at am!ient conditions.
a. !. c. d. '.
.# inch and #." inch #." inch and .# inch 1.@ inch and #.' inch None of the a!ove
/ flat plate *without Boints is used as permanent !lank for flanged point with gasket =.4 (( mm 4esign pr. (( psi. and safe stress value for plate is 1'&((( psi& for given o temperature of $( -& what shall !e the minimum !lank thickness from given options. -orrosion allowance is Nil code of construction 0 "1."? a. !. c. d.
.
0oth material */ and *0 are ,A */ is ,A !ut *0 is not ,A *0 is ,A !ut */ is not ,A 0oth are not ,A
#$( #) ""( "$
psi psi psi psi
-alculate pneumatic test pressure for a!ove piping considering stress correction.
a. !. c. d. @.
"#@ "@) #(' ""(
psi psi psi psi
+a6imum 0rinell hardness o!served *after PWHT on following three Boints were as follows< Coint 1< +,- P No. #& thk 1)mm& Hardness #( H0 Coint < +,- P No. $& thk 1)mm& Hardness "' H0 Coint "< +,- P No. "& thk ( mm& Hardness ' H0 ;our assessment is< a. !. c. d.
1(.
/ll Boints are oka5 as per /%+9 0 "1." Coint & and " are oka5& Boint 1 not oka5 ,nl5 Boint 1 is oka5. Coint and " are not. None of the a!ove are correct answers.
=dentif5 incorrect statementDs< a.
=n impact test e6emption curves& curve 4 represents !etter toughness material than curve 0 !. curve - represents more !rittle material than -urve 0 c. 8ull5 deEo6idi>ed steels are tougher than nonEdeo6idi>ed materials d. a and c EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE 9nd EEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
17 %ch '( pipe& thk 1.#$ mm 17 %ch 1)( pipe& thk ""." mm / 1() Gr 0 is -urve 07 material. :ef. 8ig. ""../& -om!ination of 2 1(oc and 1.#$ mm is a!ove curve 0 *:efer Ta!le ""../ for correct reading
-om!ination of 2 1(oc and ""." is !elow curve 0 17 %ch '( No impact test 17 %ch 1)( :equire impact test Correct answer: b
F."
PD
tm 2( SE + Py )
+
C
s (((( psi& 9 (.'$ 4 1)'.' mm& ;(.#
360 x 168.28 2( 20000 x 0.85
+
360 x 0.4 )
+
2
1.I ". tord
3.77 0.875
=
mm.
4.30
Thk of ) 7 %ch #( .11 . . . safe Correct answer: a
F.#
+aterial / /verage of "
16 + 17.5 + 9.5 3
=
14.33
Ok .
Jalue of 1 is @.$ ft l! K 1( ft l! LLLL not Ok . +aterial 0 /verage of "
15
+
14
+
10
3 LLLLL
Jalue of 1 is 1( ft l!
=
13.0 LLLLL Ok .
Ok .
Correct answer: c
F.$
Nett 96pansion for "$(M8 96p. up to "$(M8 2 e6p. up to 1((M8 ".E (."# .') 8or 1$( feet& Total 96pansion 1.$6.')#.@7 O #."7 Nett e6pansion for E$(M8 * 96p. up to 2 $(M8E*96p. up to 1((M8 E 1.# 2 (."# E 1.$'. Negative sign means it is actuall5 contraction 8or 1$( feet& Total -ontraction 1.$61.$' ."7 O .#7
Correct answer: b
F.)
tm
3 P
d g
16 SE
200
I -
3 x 200 16 x 18,000 x 1
@.1 mm
I (
sa5 1( mm
Correct answer: b
F.
Pt 1.$ 6 P 6 1.$ 6 "(( 6
Stress at test temp Stress at design temp 20000 18900
