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Gerencia Técnica Departamento de Ingeniería y Obras
MET ET 002
CLAD, LINED AND WELD OVERLAYED PRESSUREVESSELS
REV. FECHA DESCRIPCIONPREPARADO
POR APROBADO
POR
2 31.08.2007 H.M.
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INDICE DE R EVISIONES
PÁGINA REVISIÓN FECHA
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CONTENTS
I- SCOPE
II- DESIGN
III- MATERIALS
IV- GENERAL WELDING
V- WELDING PROCEDURES AND HOMOLOGATION OF WELDERS
Chart 1: ELECTRODES TO WELD VARIOUS MATERIALS USING MANUAL ARC
WELDING
Chart 2: COATED ELECTRODES FOR STAINLESS OVERLAY ON CARBON
STEEL OR LOW ALLOY PLATES
VI- PRODUCTION TESTS
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I- SCOPE
A- This specification, together with the specification MET-ET-001 covers ANCAP
requirements for the esign an e!ecution of we"s of pressure vesse"s fa#ricate
with c"a p"ates, p"ates with we" over"a$, an p"ates with "ining%
&- The c"aing materia"s inc"ue'
1% (erritic stain"ess stee"s 11) - 1*) Chromium
2% Austenitic stee"s Chromium-Nic+e"
*% Nic+e" #ase a""o$s
C- The se"ecte c"aing materia" sha"" #e specifie in the vesse" rawings or in its
requisition%
No eviation from this specification sha"" #e a""owe without a written approva" #$ ANCAP%
II- DESIGN
A- C"aing materia" sha"" #e se"ecte accoring to its resistance to corrosion in the
particu"ar service conitions of the vesse" an it sha"" not #e consiere in the
ca"cu"ation of the vesse" wa"" thic+ness%
&- The no"es, manho"es an other openings sha"" #e esigne as fo""ows'
1- ntegra" c"a with the c"aing materia" of the vesse" she""%
2- .ining #$ we"ing as it is shown in /etai" A on page 1%
*- n case the vesse" oes not nee heat treatment after we"ing, no"es can #e
"ine with p"ates as it is shown in /etai" &%
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- Piping with a iameter equa" to or #e"ow 3 4/ that cannot #e over"a$e #$
we"ing can #e "ine with "oose s"eeves as it is shown in /etai" C, meeting the
fo""owing requirements'
a% That the fa#ricator 5ustifies through ca"cu"ations that the imensions .1,.2
sha"" #e a#"e to a#sor# the e!pansions cause to the esign temperature in
the consiere area%
#% That the fa#ricator gets the approva" of the metho propose for the pre-fa#rication of the s"eeve, its we"ing, heat treatment of the s"eeve if
necessar$, assem#"$ of s"eeve an e"astic ring an tests that he is meant to
carr$ out%
c% n case the equipment require heat treatment, the e"astic ring sha"" #e
we"e to the c"a an to the s"eeve, we"ing 6A3, “after3 carr$ing it out an
without further treatment%
This so"ution sha"" not #e app"ie to heat e!changers she""s% E!changers t$pe 7
are an e!ception%
- (or no"es with a iameter equa" to or #e"ow 23 4%/, a so"i a""o$ ma$ #e use%
8hen such connections are stain"ess stee" 9ferritic or austenitic:, the$ sha"" #e
use uner operating conitions that o not present fatigue an within
temperatures that o not e!cee 00;C% These stain"ess stee" no"es sha"" #e
we"e to the #o$ with e"ectroes E*0<% =ee a"so % > on this stanar for
specific prohi#ition%
C- A"" the no"es "ine with "oose p"ates?s"eeves sha"" #e vente e!terna""$ so as to
re"ease gases prouce uring the we"ing process an in orer to prove that the
interior s"eeve is proper"$ we"e to the tu#e%
/- The interna" supports for "ight "oas, such as rings for tra$s, ma$ #e we"e to the
p"ates as "ong as the$ avoi the areas of non-aherence%
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E- 8henever supports for heav$ "oas, such as #eams for gris, are require, she"" c"a
sha"" #e remove% A support of the same materia" as the #o$ materia" ma$ #e we"e
with fu"" penetration to the #o$, restoring the c"aing #$ we"ing% As an a"ternative,
for operating conitions #e"ow 00;C, the area where c"a is remove from, ma$ #e
we" over"a$e, we"ing a support of the same materia" as the c"a% An$wa$
9especia""$ in the "ast case: the fa#ricator sha"" consier therma" fatigue anifferentia" e!pansion in his esign%
III- MATERIALS
A- The materia" sha"" #e specifie in ANCAP rawings% C"a p"ates sha"" #e provie in
accorance to the fo""owing specifications'
1% 1*) Chromium accoring A=TM A-2*
2% Chromium- Nic+e" accoring A=TM A-2
*% Nic+e" #ase a""o$s accoring to A=TM A-2
&- 8hen a "ow a""o$ #ase p"ate is require for h$rogen service, the c"a p"ate sha"" not
have an intermeiate soft stee" "a$er #etween the c"aing an the #ase p"ate%
C- The c"a p"ate sha"" #e u"trasonica""$ inspecte to etermine the qua"it$ of its 5oint in
accorance to A=TM A-@% An$ area that oes not meet these requirements ma$ #e
repaire #$ we" eposit% =uch over"a$ sha"" #e carrie out in accorance to this
=pecification an the ANCAP nspector sha"" #e previous"$ informe%
/- A"" the c"a p"ate sha"" #e su#5ecte to the shear test require #$ the materia"
specification state in the previous paragraph A%
E- A"" a""o$ materia" use in the construction of the equipment sha"" #e su#5ecte toPositive Materia" entification 9PM: on site%
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IV- GENERAL WELDING
A% Mechanica" properties of a"" the #utt we"ings sha"" meet the requirements of the
app"ica#"e Coe%
&% Car#on an "ow a""o$ #ase materia"s that are not protecte from the corrosive
contents of the vesse" sha"" #e covere with corrosion-proof we"ings%C% 4n"$ high a""o$ #utt we"ings an fu"" penetration we"ings sha"" #e a""owe when one
or #oth #ase materia"s are so"i an high"$ a""o$e% An$wa$, the acceptance of such
union #etween ifferent materia"s sha"" #e #ase on ca"cu"ations or ata%
/% 8hen the c"a p"ates are we"e one to the other, the we"ing #etween the #ase
p"ates sha"" #e mae #efore the high a""o$ we"ing% >ner no circumstance sha"" a "ow
a""o$ we"ing meta" #e eposite on a higher a""o$ #ase meta" or we"ing meta"%
E% To we" simi"ar #ase materia"s, an e"ectroe with chemica" an mechanica"
characteristics equiva"ent to the #ase materia"s sha"" #e use, e!cept for those #utt
we"ings in #ase materia"s of 1*) Chromium where e"ectroes E-*0< or E-NiCr-(e 2,
E-NiCr-(e * 9e!amp"e' ncowe"-A or ncone" 12: ma$ #e use%
(% To we" ifferent #ase materia"s, e"ectroes sha"" #e se"ecte in accorance with
charts 1 an 2%
B% The eposits of austenitic Chromium-Nic+e" we"ings sha"" norma""$ have contents
from *) to 10) ferrite, e!cept otherwise specifie or in case a pro"onge heating
over 00;C is not e!pecte 9uring service or uring the heat treatment after the
we"ing:%
% The c"a we"ings sha"" #e mae at "east in two "a$ers to supp"$ a eposit equa" in
composition to the eposit mae #$ the e"ectroe in the "ast "a$er specifie in chart 2
for a epth at "east equa" to the nomina" thic+ness of the specifie c"aing%
%f a fa#ricator tries to use the proceure of immerse arc with a high a""o$ "a$er, he sha""
provie comp"ete etai"s with his offer to #e approve #$ ANCAP% The etai"s sha""
inc"ue the inspecting proceure to #e use%D% n #utt we"ings of the c"a p"ate, it is #etter for the "ining to #e trimme #efore the
we"ing% f another +in of 5oining is propose, the fa#ricator sha"" specif$ the
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precautions he sha"" ta+e to ma+e sure that no car#on stee" or "ow a""o$ e"ectroe
sha"" #e eposite on the c"aing materia"% These precautions sha"" inc"ue etai"s
regaring the inspection methos that sha"" #e app"ie to the 5oint #efore an after
app"$ing the we"ing%
7% The a""o$ c"aing sha"" #e cut #ac+ at a"" seams to permit #ac+we"ing of the
#ase meta"% 8e" meta" sha"" #e groun f"ush an fu""$ covere with the
app"ica#"e we" eposit shown in preceing ta#"e% The we" eposit sha"" #e at"est as thic+ as the "ining #ut no greater than twice its thic+ness%
.% The a""o$ c"aing sha"" #e 100) u"trasonic e!amine for "ac+ of #on after
forming an, if necessar$, repaire #$ we" over"a$ of the same or simi"ar
ana"$sis% No"es ma$ a"so c"a #$ e!p"osion #oning with the same
e!amination as for c"a heas%
M% The we" over"a$ sha"" #e app"ie circumferentia""$ to the vesse" an sha"" #e
re"ative"$ smooth with no notches an unercuts that wou" act as stress
raisers% A"" crac+s an fissures an circu"ar efects greater than 1?1 in%
iameter sha"" #e remove% epaire areas sha"" #e remove% epaire areas
sha"" #e reinspecte #$ "iqui $e penetrant%
N% A"" we" over"a$, whether #$ manua" or automatic proceures, sha"" #e "iqui
$e penetrant e!amine in accorance to the methos escri#e in A=TM E
1% 8hen the over"a$ invo"ves two passes 9"a$ers: an the proceure uses an
intermeiate heat treatment with coo"ing to room temperature prior to app"$ing
the secon "a$er, each "a$er sha"" #e e!amine% 8here over"a$ is to #e
machine, such as in no"es an f"ange facing, machine surfaces sha"" #e
e!amine% f 100) of the over"a$ is e!amine prior to the fina" post-we" heat
treatment, the over"a$ sha"" #e spot e!amine 9no "ess than 10) of the surface:
after heat treatment% =pot e!amination sha"" a"so #e conucte after shop
h$rostatic testing%
4% =amp"es of the we" over"a$ sha"" #e ta+en to confirm chemica" ana"$sis to the
require epth as specifie% The num#er an "ocation of samp"ing are at thefa#ricatorFs iscretion, however, the$ sha"" #e representative of each
e!changer component for each automatic an manua" we" app"ications%
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P% (or heat e!changers, the we" over"a$ proceure sha"" #e qua"ifie on #ase
meta" of the same composition as the e!changer component an thic+ness of
not "ess than one ha"f of the e!changer component thic+ness%
G% No"es in a""o$ "ine portions of e!changers sha"" #e a""o$ "ine an face%
The facing sha"" #e mae with we" eposit which is at "east as thic+ as the
"ining when proper"$ machine an of the same a""o$ as the "ining% 8hen t$pes
0 or 10= or other stain"ess stee" "inings are use, the facing we" epositsha"" #e mae with t$pe *0< we"ing e"ectroe for the first pass% =ee Chart 2
for further etai"s%
% The metho of "ining "arge no"es an manwa$s sha"" prefera#"$ #e the same
as use on the she""%
=% (or sma"" no"es, 1-1?2 an 2 inch sie, tu#u"ar "iners ma$ #e use% The$ sha""
#e we"e to the a""o$ facing at the f"ange en an to the insie, f"ush with the
e!changer vesse"%
T% Tu#u"ar austenitic stain"ess stee" "iners, in no"es where the esign
temperature e!cees @0 H( 900 HC: or in no"es which e!cee 1 inches in
"ength, sha"" #e we"e to the a""o$ facing at the f"ange en an attache to the
vesse" "ining #$ means of an e!pansion co""ar with a f"are en to permit a fu""
penetration #utt we" attachment to the tu#u"ar "iner%
>% (or car#on or "ow a""o$ stee" e!changers, so"i a""o$ no"es are not
recommene an austenitic stain"ess stee" no"es are not permitte%
I% 8hen car#on stee" is we"e to austenitic stain"ess stee", the issimi"ar 5oint
sha"" #e mae with e"ectroes of nco-8e" A or T$pe *0< 92-12: in orer of
preference%
8% Paragraphs @ an 1 of Appeni! N( in part >N( of =ection I, /ivision 1 of
the A=ME Coe are manator$ for nonferrous c"aing or app"ie "ining%
J% No"es an their reinforcement sha"" #e attache to the e!changer with fu""
penetration we"s% &ac+ing up strips, if use, sha"" #e remove%
K% A"" we"ing irect"$ to the #ase meta" sha"" #e comp"ete prior to fina" heattreatment, when require%
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V- WELDING PROCEDURE AND HOMOLOGATION OF WELDERS
A- The fa#ricator sha"" fo""ow the app"ica#"e coe 9A=ME- =ection J: an o#tain the
approva" of ANCAP #oth for the we"ing proceures an for the we"ers #efore
carr$ing out an$ fina" we"ing%
&- Each we"ing proceure sha"" #e assigne a ifferent num#er% This num#er sha"" #e
referre to in the re"evant9s: etai"9s: of the fa#ricatorLs rawings%C- The we"ing proceure sha"" inc"ue the fo""owing etai"s'
1- =pecification of the #ase materia"%
2- =pecification of the c"aing
*- =pecification of the materia" eposite on the first an secon "a$er%
- =tructure of the 5oint esign, sequence an isposition of passes%
- E"ectrica" characteristics of each pass
/% The proceures an we"ers use in the c"aing process with we"ing sha"" #e
homo"ogate in accorance with the A=ME Coe =ection J aing the fo""owing
tests'
1% Ierification of the principa" a""o$ing e"ements on"$ in test specimens for
proceure homo"ogation% =uch verification sha"" #e carrie out in samp"es
e!tracte from the we"ing surface at a epth 9at "east: equa" to the nomina"
thic+ness of the specifie c"aing%
2% Ierif$ing the ferrite in the test specimens of the we"ing proceure an the
we"er homo"ogation%
*% .iquis penetrant test of test specimens for we"ing proceure an we"er
homo"ogation%
Chart 1' E!"tr#$!% t# &!$ $'((!r!)t *at!r'a% +%'), th! *a)+a ar" &!$'),
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(irst &ase Materia" =econ &ase Materia" E"ectroe
Car#on stee"
or
.ow A""o$ =tee"
we"e to
Cr%- Ni Austenetic A""o$
or
1* Cr% (e A""o$
T$pes 0 an 10=
E*0<
92 Cr-12 Ni:
or
E Ni Cr (e *
9ncone" 12:Car#on =tee"
or
.ow A""o$ =tee" we"e in' Mone"
E Ni Cu @
9Mone" 1<0: or
E Ni Cr% (e 2 or
E Ni Cr% (e *
9ncone" 12:N#t!: I) )# "a%! %ha a) !!"tr#$! 2Cr-2. N' /E01. ! a33'!$4
Chart 2' C#at!$ E!"tr#$!% (#r %ta')!%% #5!ra6 #) #& a#6 #r "ar#) %t!! 3at!
E"ectroes=pecifie .ining A""o$ (irst .a$er =econ .a$er
T$pe 0
T$pe 10=
E-*0<
E-*0
T$pe *0
T$pe *0.
E-*0< or
E-*0< C# E-*@
T$pe *1
T$pe *1.
E-*0< Mo
E-*1 .
T$pe *21
T$pe *@
E-*0<
E-*@
Mone" E Ni Cu @
9Mone" 1<0:
E Ni Cu @
9Mone" 1<0:
VI- PRODUCTION TESTS
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A- The fa#ricator sha"" contro" the #atch num#ers of a"" the coate e"ectroes an the
ientification num#ers of each wire coi"% &efore using it, he sha"" ma+e an ana"$sis of
the main a""o$ing an car#on e"ements%
&- The fa#ricator sha"" ma+e sure that no car#on stee" or "ow a""o$ we"ing sha"" #e mae
in the "ining or in the remainers of the "ining% (or this purpose he sha"" escri#e in his
proceure the tests he means to perform in the union, #efore, uring an after
we"ing%C- A"" corrosion-proof we"ings that are finishe, even c"aing, sha"" have to #e
e!amine 100) with "iquis penetrant in accorance with the A=ME Coe =ection
I, /ivision 1 Appeni! I an, in an$ case, after finishing an$ necessar$ heat
treatment%
/- n a"" Chromium Nic+e" austenitic we"ings the contents of ferrite sha"" #e verifie
#efore carr$ing out the heat treatment%
E n case of Mone" c"aing'
1% it sha"" #e necessar$ to chec+ that a"" Mone" has #een remove from the "ower
part of the we"ing #eve", impregnating the area to #e e!amine with a so"ution
of copper su"fate 9Cu =4:% n the areas where there is sti"" Mone", there wi""
#e #rightness some minutes after the app"ication of the so"ution, whereas in
the areas where Mone" has tota""$ isappeare, the stee" sha"" #ecome go"en
or copper "i+e%
8hen a"" Mone" has #een e"iminate, an #efore we"ing, an$ remainer of
so"ution sha"" #e e"iminate
The concentration of Cu=4 is not important%
2% 4nce the c"a we"ing has #een finishe an in orer to prove that it is not
contaminate with iron, the fo""owing proceure sha"" #e carrie out'
a- =trict c"eaning of the surface to #e e!amine #$ an$ non-contaminant
metho 9 new sanpaper, mone" #ar# #rush, po"isher with corinon is+ are,among others, accepta#"e proceures:
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#- App"ication over the area to #e e!amine with atomier of a so"ution
compose #$'
1 vo"ume of concentrate c"orh$ric aci 9C.: 912%1 N,22 &e ) weight of
2C" or specific weight 1%1 +g?":
< vo"umes of aqueous so"ution of potassic ferri-c$anie 7(e9CN: at 0)
in weight
c- The appearance of #"ue co"oring #efore two minutes inicates contaminationof the Mone" #$ the iron%
The contaminate areas sha"" #e repaire e"iminating the contaminants an #$ a
new we"ing or, whenever it is possi#"e, epositing on the affecte area a new
"a$er of we"ing thic+ enough to permit a satisfactor$ test%
* n an$ case, the so"ution escri#e in the previous section E%2%#, sha"" #e
prepare immeiate"$ #efore its use% A test in white sha"" #e mae app"$ing the
so"ution in Mone" an iron test specimens% The Mone" test specimens sha"" #e
co"ore after 10 minutes of #eing app"ie% f it appears #efore that time it means
that the so"ution is too aci an therefore it sha"" have to #e rep"ace #$ a new
one% n the iron test specimens, the #"ue co"oring sha"" appear immeiate"$%
The contamination test sha"" #e carrie out #oth in the homo"ogation proceures
an the prouction test specimens %
(- A"" the c"aing with "oose or we"e p"ates sha"" #e su#mitte to the test of air "ea+
an soaping water%
B- 8here supports are irect"$ we"e to the "ining, the union of the coating in the
affecte area, sha"" #e e!amine u"trasonica""$ at 100) accoring to the A=TM A-
@% No "ac+ of union sha"" #e a""owe in this area%
- A #an 0 mm wie an a5acent to a"" the "imits of the we"ing, inc"uing openings
for men access an no"es sha"" #e inspecte u"trasonica""$ at 100) accoring to
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A=TM A-@% No omission of unions sha"" #e a""owe in these areas%
- An$ "ac+ of union that e!cees the authorie #$ A=TM A-@ or an$ "ac+ of 5oint in the
#ans specifie in paragraphs I%B% an I% sha"" #e repaire "ining it with we"ing
accoring to this specification or as it is specifie #$ ANCAP% These repairs sha"" #e
carrie out uner the +now"ege an consent of the inspector esigne #$ ANCAP%
Ancap – División Combustibles.
8/13/2019 MET ET 002
http://slidepdf.com/reader/full/met-et-002 15/16
División Combs!ib"#s
$#%#n&i' ()&ni&'
C*AD+ *INED AND OVER*A,EDPRESS-RE VESSE*S
ME( E( 002
P/ 15 # 1
R#v 2
F#&' 31.08.2007
DETAIL A
Nozzle with weld depposit
(For electrodes see Charts 1 y 2,
and paragraph I!"!#
DETAIL BLining method by means of plate.(For electrodes see Chart 1
Ancap – División Combustibles.
8/13/2019 MET ET 002
http://slidepdf.com/reader/full/met-et-002 16/16
División Combs!ib"#s
$#%#n&i' ()&ni&'
C*AD+ *INED AND OVER*A,EDPRESS-RE VESSE*S
ME( E( 002
P/ 1 # 1
R#v 2
F#&' 31.08.2007
DETAIL C Lining method for piping with diameter equal or less than 6",
when weld deposit according to detail A.
! ELD"A" ELA#TIC $I%&
'E%T ()" %*T
ALL+ #LEE'E
ALL++'E$LA
L
L
-not welded to nole/
-not welded to nole/
is not possi0le
$E#I#TA%T ELDI%&12LL *E%ET$ATI+% 0
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