reinforcement of nozzle

8/16/2019 Reinforcement of Nozzle

1/34

SHELL INPUTS Internal pressure P psi 25

Internal diameter of the shell D inch 78

Reqd. thickness of shell (corresponding to internal pressure) inch .2

Reqd. thickness of shell (corresponding to e!ternal pressure) inch .""

#llo$a%le stress in shell at gi&en temp psi '88

orrosion allo$ance of shell Iinch .'25

hell thickness pro&ided inch .*75

NOZZLE INPUTS

t+pe of no,,le set in nozzle with pad-o,,le .D. d/ inch *0

-o,,le $all thickness pro&ided inch .875

no,,le pro1ection outside the &essel $all inch 8

allo$a%le stress in no,,le psi '8

ffset distance ff inch '8.25

reqd. no,,le thickness(corresponding to e!ternal pressure) inch .'25

REINFORCING PAD INPUTS

outside diameter of reinforcing pad inch 52

thickness of reinforcing pad inch 52

is it split t+pe padding NO

WELD LEGS INPUTS

$eld leg %et$een pad and shell inch

$eld leg %et$een no,,le and padshell inch '0

CERTAIN DERIVED PARAMETERS

corrosion allo$ance of no,,le (internal onl+) inch .'25

allo$a%le stress in reinforcing pad at gi&en temp psi '88

hell thickness after corrosion t inch .25

-o,,le $all thickness after corrosion inch .75

inside diameter of no,,le d inch *".5

$idth of reinforcing pad 3 inch 8

la+out angle 4 radian ."85277

reqd. no,,le thk inch .2"80'

Reqd. thickness of shell (go&erning the case) inch .""

USE ASME CODE SECTION-8 DIVISION I (UG-3!

tr6inttr6e!t

&

c.a.6shell

t/

tn

/

pr'

n

tr n6e!t

Dp

te

leg'

leg2

c.a.6no,,le

p

tn

tr n

tr


2/34

CONSIDE" #I$UID %EAD

&IT%OUT CO""OSION A##O&ANCE

&IT%OUT CO""OSION A##O&ANCE

SE#ECT '"OM D"O DO&N #IST

3#R-I-9::;< #-< =; >R;


3/34

MIN NOZZLE THICKNESS (ACCORDING TO UG-45)

inch .*7*0'

inch .505

inch .25

inch *.*"5

inch .505

"OVIDED NO))#E &A## T%IC*NESS IS SU''ICIENT

LIMITS OF REINFORCEMENT

D' inch 0

tlnp inch .025

CALCULATION OF CERTAIN FACTORS

fr'6fr2 A A .57"5n&

ta

(P(d/)(2(nB(."CP)))Bc.a.

6no,,le

t%'

tintBc.a.6no,,le

t%2

te!t

Bc.a.6no,,le

t%*

from ta%le Bc.a.6no,,le

min no,,le thickness(tug"5

)

ma!(ta6.min(t

%*6ma!(t

%26t

%')))

limit parallel to &essel $all (D')

2Cma!(d6RnBt

nBt)

limit normal to &essel $all (tlnp

)

min(2.5t62.5tnBt

e)


4/34

min(n6p)&A A .

fr"A A '

p&

force correlation factor A A '

if integral t+pe(.75B.25cos2)6else '

AREA CALCULATION

#rea required'5.7708'

#rea a&aila%le in shellA.'22287

#rea a&aila%le in no,,le.00

#rea a&aila%le in $elds250

#rea a&aila%le in pad8*2

#rea a&aila%le in hu%

#rea a&aila%le in %e&el

#rea a&aila%le in hu% plus %e&el

total area a&aila%le'87.*8

OENING IS ADE$UATE#+ "EIN'O"CED

#r inch

2

Eif frF'G dtr : B 2t

ntr :('Af

r')6 else dt

r :

#' inch

2

ma!(dE;'tA:t

r GA2t

n(;

'tA:t

r )('Af

r') 6 2(tBt

n)(;

'tA:t

r )A2t

n(;

'tA:t

r )('Af

r'))

#2 inch

2

min(5f r2t(t

nAt

r n)62f

r2tn(t

nAt

r n)(2.5t

nBt

e)

#" inch

2

(leg')2f

r'

#5 inch

2

(min(Dp62Cd62C(R

nBt

nBt))AdA2t

n)t

ef r"

#0' inch

2

2Cmin(h6tlnp

6pr'

)C(HAtn/)Cf

r2

#02 inch

2

ma!(tlnp

Ah6)C((ma!(tlnp

Ah6)/)C(HAtn))B(HAt

nA((ma!(t

lnpAh6)/))C(HAtn))

#0 inch

2

#0'

B#02

#< inch

2

#'B#

2B#

"'B#

"2B#

5B#

0'B#

02


5/34


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8/34


9/34

CA#CU#ATION ,+ AENDI .-./


inch .*7*0'

inch .505

inch .25

inch *.*"5

inch .505


CERTAIN PARAMETERS

inside radius of no,,leinch '7.25

effecti&e pressure radiusinch *.'25


ta

(P(d/)(2(nB(."CP)))Bc.a.

6no,,le

t%'

tint

Bc.a.6no,,le

t%2

te!t

Bc.a.6no,,le

t%*


min no,,le thickness(tug"5)

ma!(ta6.min(t

%*6ma!(t

%26t

%')))

Rn(d/A2t

n)2

Reff D2Bc.a

6shell.


10/34

.

inch *.5550'

inch 8.25

inch "'8

for calculating ?inch

effecti&e no,,el $all lengthinch *.5550'

effecti&e thickness used in calc. of pressure stressinch .25

CALCULATION OF AREAS

A 7.57

area contri%uted %+ &essel'.2"*25

area contri%uted %+ no,,le2.2'07'

area contri%uted %+ $elds'28

area contri%uted %+ reinforcing pad'*

total area a&aila%le 20'.5*5

ALLOWABLE STRESS

allo$a%le local primar+ mem%rane stresspsi 27

FORCE CALCULATION

no,,le radius opening in &essel along long chordinch '.5'5"

internal pressure force on no,,lel% '2.88

R 8t6't68(tBte)(acc to diff condtns.)

for calculating ?

?'tB.78(Rntn).5

for calculating ?

?2pr' B t

for calculating ?

?*8(tBte)

?"H(hBt)B.78(t

n(HAc.a.))(R

ntn).5

?if(hJ)6min(

?'6

?26

?*) else min(

?'6

?26

?")

teff if t

eK.5tand $K8(tBt

e)6tBt

e else t

for calculating #'

min('6 (2RnBt

n)((DBt

eff )t

eff ).5

#' inch

2

tRma!('6")

#2 inch

2

if(?FhBt)t

n

?else(H(hBt)B.78(t

n2(HAc.a.))(R

ntn).5)

#" inch

2

.5eg'

2 B .5leg22

#5 inch

2

min(#5a

6#5%

)

#< inch

2

#'B#

2B#

"'B#

"2B#

5

allo$'.5C

n

RncR

ncosL

f -PR ( At)


11/34

internal pressure force on shelll% *'.780

discontinuit+ force from internal pressurel% '.7""

MAXIMUM ALLOWABLE PRESSURE CALCULATION

*8.5"

psi A'8.8'0"

psi ''.5'0

no,,le ma!imum allo$a%le pressurepsi A'8.8'0"

STRESS CALCULATION

a&erage primar+ mem%rane stresspsi 8.7'552

general primar+ mem%rane stresspsi *'2.5

ma!. local primar+ mem%rane stress at no,,le intersectionpsi *'2.5

f PR

eff (

RBt

n)

f MPR

eff R

nc

used in calculation of Pma!' #

P inch2

Rn(

?At)BR

eff (

RBt

nBR

nc)

used in calculation of Pma! P

ma!'allo$

(2(#p#

<)A(R

eff t

eff ))

used in calculation of Pma! P

ma!2nC(tR

eff )

Pma!min(P

ma!'6P

ma!2)

Na&g(f

-Bf

Bf

M)#

<

NcircPr

eff t

eff

Pma!E2N

a&gAN

circ6N

circG

OENING IS NOT ADE$UATE#+ "EIN'O"CED0 INC"EASE T%IC*NESS O'"EIN'O"CING E#EMENTS


12/34


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14/34


15/34

CA#CU#ATION ,+ AENDI .-


mm .*7*0'

mm .505

mm .25

mm *.*"5

mm .505


CONDITION ON LIMIT OF REINFORCEMENT

area required for reinforcement'5.7708'

from ugA*7

t$o third of area required'.5'787


limit parallel to &essel $allmm 5'.75

limit normal to &essel $allmm .025

AREA CALCULATION

area contri%uted %+ shell

A*.'787

area contri%uted %+ no,,le.00

same as in ugA*7

area contri%uted %+ $elds250

same as in ugA*7

area contri%uted %+ pad

ta

(P(d/)(2(nB(."CP)))Bc.a.

6no,,le

t%'

tintBc.a.6no,,le

t%2

te!t

Bc.a.6no,,le

t%*


min no,,le thickness(tug"5

)

ma!(ta6.min(t

%*6ma!(t

%26t

%')))

so1e additional 2onditions ae i1posed on 45-3 when we 4se appendi6 .- 74t aea

e4ied 9o ein9o2e1ent e1ains the sa1e and th4s we will die2tl: 4se it

(AT,l

AR )

#< mm

2

#R mm

2

.0000000C#<

d'2Cma!(.75Cd6R

nBtBt

n)

d2min(2.5Ct62.5t

nBt

e)

#' mm

2

(d'A2CRn)CE;'tA:tr GA2tn(;'tA:tr )('Af r')

#2 mm

2

#" mm

2

2


16/34

area contri%uted %+ hu%

same as in ugA*7

area contri%uted %+ %e&el

same as in ugA*7

total area $ithin limits'72."

#IMIT O' "EIN'O"CEMENT IS SATIS'IED

2he2; 9ollowin5 2ondition on stesses onl: i9 nozzle I


17/34

CALCULATION OF SHADED AREAS FOR MEMBRANE STRESS

mean radius of shellmm *.25

mean radius of no,,lemm '7.025

shaded area in fig 'A7A' '77.'280

CALCULATION OF AREAS FOR BENDING STRESS

area of shell'

area of reinforcing pad28

area of no,,le0.'875

area of hu%

area of %e&el

CALCULATION OF MOMENT OF INERTIA

distance %et$een neutral a!is Oshell mid$ell e mm 20.'7252

distance %et$een neutral a!is and shell %ottoma mm 20.2752

eBt2

moment of inertia I "8".2"

STRESS CALCULATION ma!. mem%rane stress

252.755

%ending moment> kgfcm "02.87*

ma! %ending stress2"".2"5

>aI

RmReff B t2

RnmR

nB t

n2

#s mm

2

#' mm

2

tCma!('0t6(Rmt).5)

#2 mm

2

teCmin('0t636(R

mt).5)

#* mm

2

tnCmin(

pr'Bt6ma!(tBt

eB(R

nmtn).56tBt

eB'0t

n))

#" mm

2

(HAtn/)C(k

'Bt)

#5 mm

2

.5C(HAtn/)Ck2

mm"

m kgfcm

2

P(R(RnBt

nB(R

mt).5)BR(tB(R

nmtn).5))#

s

P(Rn*0 BRR

ne)

% kgfcm

2


18/34

com%ined mem%rane and %ending stress"0.78"'

allo$a%le mem%rane stress'8

allo$a%le com%ined mem%rane and %ending stress27

'.5Cn

ST"ESS CONDITION IS SATIS'IED

mB% kgfcm

2

m

B%

m6allo$ kgfcm

2

n

mB%6allo$ kgfcm

2


19/34


20/34


21/34

C(HAtn/)Cmin(/6(tBt

nB(R

nmtn).5Ah))B(


22/34


23/34


24/34


25/34

Atn/)C(tBmin(tBt

eB(R

nmtn).56h))Bt

n(tBt

eB(R

nmtn)

.5)B tC(Rmt).5B t

e(min('0t6


26/34


27/34

a5e No

Do2< No< "e?ision

I-


28/34

-; >#


29/34

-; R#DI@ :R :R; #@#


30/34

STRENGTH OF NOZZLE ATTACHMENT WELDS

DI-


31/34

2E-006 0.01183


32/34


33/34

;rr952


34/34

reinforcement of nozzle

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