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nt iid': Aigenlino de CALCULO
Y
DISCGD @E RCCIPIE dTES A PRESIOY
Aa~nm: ci in Iiidusliirl
La p r e s i ó n d e c á l c u l o es
l a PD ná s l a p r e s i ó n
ca q u e c o r re s p o n d a a l a p a r t e s q u e s e e s t á d i m e n si o na n d 0
P a- ej er i ip lo e l c a b e z al i n f e r i o r dehe s e r d is e ñ
p s i g (25 kgr /c1n2- man), pu es to que una co lumna de agua
son aprox i i i iadasente 30 p s i g . ( 2 k g r /c n i 2 ). -
La e nv o lv e n t e c i l í n c l r i c g
puede s e r d i v i d i d a en 2 p a r te s s ie n do l
c a l c u l a d a p a r a 3 60 p s i g ( 2 5 k gr r'c r. 2 man) y l a s u p e r i o r p a r a 3 45 p s i g
nian) .
l
L as c o n e x io n e s s e r á n c a l c u l a d a s d e a c u e rd o c o n l a p r e s i ó n qu e co
a l a a l t u r a d on se s e e n cu e n t ra n u b i c ad a s .
E1 c á l c u lo puede queda r te r p in ad o en es te p un to y en tonces MPAT=
P e r o e l
i n g e n i e r o d e d is e ñ o q u e r e s a b e r c u a l es e l v a l o r m áxim o
que puede
r e s i s t i r e l r e c i p i e n t e (MPAT) a una te c i p er a t ur a d e t er m i n a d
e s t e c a sc s e e l i g e 650" ( 34 3°C ) i g u a l a l a T @ .-
I
P or c o n s i g i i i e n t e e l c á l c u l o se r e a l i z a e n s e n t i d o i n v e r s o . -
r
a )
E n v o l v e n t e i l í n d r i c a : E l c á l c u l o d i ó e sp e so re s 16,7 nrn
y
14,4 nm
se ui i es pe so r in fo r i i i e de 19,1 nim.
Con ese va lo r 19 , l mm s e c a l c u l a una p r e s i ó n que re s t ad a a l a p r
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Insiiiuto rpsnllno
d i
l
utomacion Induai la l
CALCULO
Y
DISENO DE RECIPIENTES
A
PRESION
3.2. CALCULO DEL ESPESOR DE LA ENVOLVENTE CILINDRICA DE
ACUE
SECC ION V I I I .
E l
p a r ág r a do UG-2V d i c e l o s i g u ie n t e :
E l
espesor
o lven te c i l í n d r i c a no debe rá se r menor que e l computado
s ig u ie n t e s f ó r mu la s . ( Ad i c i o n a lme n t e s e d eb er án h a c e r o r e v i s i o n e s o ar a t e
cuén ta l as o t r as ca rgas l i s t ad as en UG-22)-
Los s ímbo los de f in idos en las fó rmu las son :
t = Espesor mín imo requ e r id o no inc luyen do co r r os ió n
P Pr es ión de d ise ño (PO)
R Radio
i n t e r i o r , a n te s de a g r eg a r e l s ob re es pe so r p o r c o r r o s i ó
S= Te ns ión ad m is ib le de acu erdo a l a s t a b la s UCS, UHA y UHT.-
E= E f i c i e n c ia de j u n t a s o ld a da .
c= Sob reespeso r p o r c o r ro s ió n
.
C á l c u l o d e l e s pe so r con l a t e n s i ó n c i r c u n f e r e n c i a 1
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I n ~ t l l ~ t oi ps n l l i i o ds
CALCULO DISENO DE
RECIPIENTES
PRESION
utomación Industrial
5 ) Rolado
6) Armado
y
punteado
7 ) So ld ad ur a ( c o s t u ra l o n g i u d i n a l y c i r c u n f e r e n c
1.
& la na do : Es una o p e r a c i ó n q ue f a c i l i t a l a s t a r e a s p o s t e r i o r e s d e t r a z a d o
t e . m e b e e f e ct u a r c uando l a chapa p r es e nt a d eform ac one s
u
o n d u lac io n e
vocadas po r s i l n ian ipu le o . -
Las n áquinas end erez ado ras son niuy co st os as
y
l a posee n t a l l e r e s <le g r a n
c i ó n . -
E s t á p r oh ib id o ap lana r a go lpe de maza como se ve r á después .-
L a s o l u c i ó n es a d q u i r i r ch ap a p l a n a o e n de r e za r e n pr e n sa .-
2.
T ra za do : O p er ac ió n r e a l i z a d a p o r e l t r a z a d o r . -
En base a l ~ e r í m e t r o ied io d e l r e c i p i e n t e
y
l
i a r g o de l a e n vo l ve n te s e
e l d e s a r r o l l o
y
ancho d e l a s e c c i ó n de e n v o l v e n t e o v i r o l a . -
E l t r a z a d o r c on l a ayuda de t i z a ,
h i l o , plomada, m a r t i l l o
y
p un zó n, e f e c t
t r a b a j o s o b r e l a chapa c o lo c ad a s o b r e c a b a l l e t e s o en e l s u e l o . -
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