MET ET 002

8/13/2019 MET ET 002

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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.

Ancap – División Combustibles.

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División Combs!ib"#s

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C*AD+ *INED AND OVER*A,EDPRESS-RE VESSE*S

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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%


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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


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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

MET ET 002

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