Lug Support Design

SUVIDYA INSTITUTE OF TECHNOLOGY Mumbai : 400055

SAMPLE DESIGN CALCULATION - VESSEL SUPPORTED ON LUGS REFEREN REFERENCE CE

PRESSU PRESSURE RE VESS VESSEL EL DESIGN DESIGN MANUA MANUAL L BY BY D.R.M D.R.MOSS OSS - (PROC (PROCEDU EDUCE CE 3-7, 3-7, #2)

SEISMIC DESIGN - VESSEL SUPPORT OF LUGS IN THIS CALCULATION, EFFECT DUE TO WIND LOAD IS IGNORED AS EUIPMENT IS LOCATED WITHIN BUILDING. DESIGN CHEC! IS CONDUCTED FOR SEISMIC LOAD

D

SHELL OUTSIDE DIAMETER

90.00 in

A

LENGTH OF R.F. AD

!".00 in

B

# IDTH OF R.F. AD

!1.00 in

C

# IDTH OF $ASE LATE

1%.00 in

E

HEIGHT OF LUG SUORT

!&.00 in

F

THI'(NESS OF $ASE LATE

1.00 in

G

THI'(NESS OF GUSSETS

0.5) in

H

DISTAN'E $ET# EEN T# O GUSSETS

"

LEASE REFER A$O*E S(ET'H

!.00 in

M

LEASE REFER A$O*E S(ET'H

!.50 in

, $

+ $'D , D -  !

15.00 in

1!.00 in

W

# EIGHT OF *ESSEL , OERATING 'ONDITION

)0000.00 /b

N

NO. OF LUG SUORTS

%&

THI'(NESS OF SHELL

0.5 in

%'

THI'(NESS OF AD

0.5 in

4 No.

1 of 11


SAMPLE DESIGN CALCULATION - VESSEL SUPPORTED ON LUGS REFERENCE

PRESSURE VESSEL DESIGN MANUAL BY D.R.MOSS - (PROCEDUCE 3-7, #2)

SEISMIC DESIGN - VESSEL SUPPORT OF LUGS IN THIS CALCULATION, EFFECT DUE TO WIND LOAD IS IGNORED AS EUIPMENT IS LOCATED WITHIN BUILDING. DESIGN CHEC! IS CONDUCTED FOR SEISMIC LOAD

CALCULATE FORCES FIND OUT BASE SHEAR  ( V ) SITE

MUM$AI INDIA

8ONE

III

(A& '* '*+* /01 0 IS4563-22)

8

2ONE FA'TOR

I

IMORTAN'E FA'TOR +Tab/3 , ) , IS:1"9&,!00!-

1

R

RESONSE REDU'TION FA'TOR +Tab/3 , % , IS:1"9&,!00!-

4

S$9/

A*ERAGE RESONSE A''ELERATION 'O,EFFI'IENT

0.1)

!.5

'/. ).4.5 , IS:1"9& , !00! Soi/ , M3ium oi/ i3

A:

DESIGN HORI2ONTAL A''ELERATION SE'TRUM

A:

2 6 I  R 6 +Sa7-

0.01)

LATERAL FORCES  (F:) F:

A8 . #

9)0 /b

HORI8ONTAL SHEAR PER LUG (V:) V:

F8  N

!40 /b

VERTICAL FORCE  (F1) F1

#

)0000.00 /b

VERTICAL SHEAR PER LUG (V1) V1

F  N

15000 /b

! of 11

SUVIDYA INSTITUTE OF TECHNOLOGY Mumbai : 400055 SAMPLE DESIGN CALCULATION - VESSEL SUPPORTED ON LUGS

REFERENCE PRESSURE VESSEL DESIGN MANUAL BY D.R.MOSS - (PROCEDUCE 3-7, #2) SEISMIC DESIGN - VESSEL SUPPORT OF LUGS ALL LUGS ARE MOUNTED OFF-CTR W.R.T PRICIPLE AIS

VERTICAL LOAD ON LUGS -- ( SIDE CONDITON ), (2) 2

*

15000 /b

LONGITUDINAL MOMENT  ( ML) ML

! . +a-

1"0000 /b.in

CIRCUMFERENTIAL MOMENT  (MC) MC

*8 . +a-

!""0 /b.in

2C4

H; !.G

1).1! in

2C2

E

!&.00 in

24

$

!1.00 in

22

A

!".00 in

4

!'1  !

".0) in

2

!'! !

11.50 in

4

!1  !

10.50 in

2

!! !

14.00 in

CALCULATE RADIAL LOAD  (;) ;

&. ML  4 . '!

1)%49.&%9% /b

STRESS CONCENTRATION FACTOR TO BE FOLLOWED FOR WELD AT ATTACHMENT 2*9 H

RATIO OF #ELD RADIUS TO ATTA'HEMNT

!

!

STRESS 'ON'ENTRATION FA'TOR F OR TENSION + 5,!0-

1.4

!<

STRESS 'ON'ENTRATION FA'TOR FOR $ENDING +5,!0-

1.!

STRESS CONCENTRATION FACTOR TO BE FOLLOWED FOR WELD AT END OF PAD *9%

RATIO OF #ELD RADIUS TO ATTA'HEMNT

1

!

STRESS 'ON'ENTRATION FA'TOR F OR TENSION + 5,!0-

1.5

!<

STRESS 'ON'ENTRATION FA'TOR FOR $ENDING +5,!0-

1.& & of 11

SUVIDYA INSTITUTE OF TECHNOLOGY SAMPLE DESIGN CALCULATION - VESSEL SUPPORTED ON LUGS

REFERENCE

PRESSURE VESSEL DESIGN MANUAL BY D.R.MOSS - (PROCEDUCE 3-7, #2) SEISMIC STRESS ANALYSIS

COMPUTE GEOMETRIC PARAMETER A% E/ +; A%%$:=%

A% E/ +; P$

R= > (D - %& ? %') 9 2 2

2 .@

% > ( %& ? %' )

45.00

in

R= > (D - %& ) 9 2

0.%0%

in

% > %&

)&.)40

> R= 9 % > C4 9R=

4

9

4

4.

2

COMPUTE EUIVALENT

"9.5

> 2 9R=

0.&1&

9

0.&%5

0.&4

2

0.5!)

4

2

4.

9

VALUE

4

0.0&%

2) 2

4

A% E/ +; A%%$:=%

A% E/ +; P$

;+* N

0.&!!

$

;+* N

0.!%"

<

;+* M

0.!!"



;+* M

0.!")



$

< 



in

0.11%

0.0)1

2)

0.5

> 4 9R=

4

> C2 93R=

in

> R= 9 %

0.1%9

2

44.%5

;+* N

0.!)"

;+* N

0.!!&

;+* M

0.1%!

;+* M

0.!&1

COMPUTING STRESS FOR A RADIAL LOAD ( AT THE EDGE OF ATTACHMENT) MEMBRANE

F0/

VALUE FROM FIGURE

;+* N

0.&!!

@-47A

N R= 9 ;

1."

;+* N

0.!%"

@-47B

N R= 9 ;

).!

;+* M

0.!!"

@-45A

M 9 ;

0.045

;+* M

0.!")

@-45B

$

<

BENDING 



M 9 ;

0.015

COMPUTING RADIAL LOAD AND MOMENTS ( AT THE EDGE OF ATTACHMENT) MEMBRANE

FORCES AND MOMENT

N

(N R= 9 ;)  ; 9 R=

))9.9"

/b

N

(N R= 9 ;)  ;9 R=

!&0%.)9

/b

M

(M 9 ;)  ;

%5&.%!

/b.in

M

(M 9 ;)  ;

!51.!4

/b.in

BENDING

COMPUTING RADIAL LOAD AND MOMENTS ( AT THE EDGE OF ATTACHMENT) MEMBRANE

STRESS CALCULATION %

1&!).4"

SI

!&0%.)9

 > !.N %

45)9.00

SI

%5&.%!

> !<.M

10"5&.)0

SI

N

))9.9"

N

> !.N

BENDING M

%2

4 of 11

SUVIDYA INSTITUTE OF TECHNOLOGY

M

!51.!4

 > .!.M %2

&)1%."%

SI

5 of 11

SUVIDYA INSTITUTE OF TECHNOLOGY Mumbai : 400055 SAMPLE DESIGN CALCULATION - VESSEL SUPPORTED ON LUGS

REFERENCE

PRESSURE VESSEL DESIGN MANUAL BY D.R.MOSS - (PROCEDUCE 3-7, #2) SEISMIC STRESS ANALYSIS

COMPUTE GEOMETRIC PARAMETER A% E/ +; A%%$:=%

A% E/ +; P$

R= > (D - %& ? %') 9 2 2

2 .@

% > ( %& ? %' )

45.00

in

R= > (D - %& ) 9 2

0.%0%

in

% > %&

)&.)40

> R= 9 % > C4 9R=

4

9

4

4.

0.&1&

9

0.&%5

0.5!)

4

0.0)1

COMPUTE EUIVALENT

"9.5

> 2 9R=

2

2)

2

4.

9

VALUE

4

0.0&%

2) 2

4

A% E/ +; A%%$:=%

A% E/ +; P$

;+* N

0.&!!

$

;+* N

0.!%"

<

;+* M

0.!!"



;+* M

0.!")



$

< 



in

0.11%

0.&4

2

0.5

> 4 9R=

4

> C2 93R=

in

> R= 9 %

0.1%91111111

2

44.%5

;+* N

0.!)"

;+* N

0.!!&

;+* M

0.1%!

;+* M

0.!&1

COMPUTING STRESS FOR A RADIAL LOAD ( AT THE EDGE OF PAD) MEMBRANE

F0/

VALUE FROM FIGURE

;+* N

0.!)"

@-22A

N R= 9 ;

!.%

;+* N

0.!!&

@-22B

N R= 9 ;

".5

;+* M

0.1%!

@-23A

M 9 ;

0.04)

;+* M

0.!&1

@-23B

$

<

BENDING 



M 9 ;

0.014


FORCES AND MOMENT

N

(N R= 9 ;)  ; 9 R=

1004.9) /b

N

(N R= 9 ;)  ;9 R=

&1)&.%% /b

BENDING M

(M 9 ;)  ;

M

(M 9 ;)  ;

%%0.4% /b.in

!&4.49 /b.in


STRESS CALCULATION %

&014."9

SI

&1)&.%%

 > !.N %

"!!5."1

SI

%%0.4%

> !<.M

!40&".%1

SI

N

1004.9)

N

> !.N

BENDING M

%2

) OF 11


M

!&4.49

 > .!<.M %2

%&1).1&

SI

% OF 11



P*&&* V&& D&0/ M$$ < D0& R. M+&&

COMBINED STRESS ANALYSIS - LUG SUPPORT WITH REINFORCEMENT PAD (AT THE EDGE OF ATTACHMENT) 

STRESS DUE TO



6

45

27



N

6

45

27

1&!).4"

1&!).4"

1&!).4"

1&!).4"

10"5&.)0

10"5&.)0

10"5&.)0

10"5&.)0

!%0.00

!%0.00

!%0.00

!%0.00

42@.5

42@.5

42@.5

42@.5

MEMBRANE N

45)9.00

45)9.00

45)9.00

45)9.00

RADIAL LOAD , ; M BENDING M

&)1%."%

&)1%."%

&)1%."%

&)1%."%

> P. R= 9 %& INTERNAL PRESSURE , P  > P. R= 9 2 %&

T+%$

1&5.00

1&5.00

1&5.00

1&5.00

5324.5

5324.5

5324.5

5324.5

COMBINED STRESS ANALYSIS - LUG SUPPORT WITH REINFORCEMENT PAD (AT THE EDGE OF RF PAD) 

STRESS DUE TO



6

45

27



6

&014."9

N

45

&014."9

27

&014."9

&014."9

MEMBRANE N

"!!5."1

"!!5."1

"!!5."1

"!!5."1

RADIAL LOAD , ; M

!40&".%09)%% !40&".%09)%% !40&".%09)%% !40&".%09)%%

BENDING M

%&1).1!90&!& %&1).1!90&!& %&1).1!90&!& %&1).1!90&!&

> P. R= 9 %&

!%0

!%0

!%0

!%0

27323.

27323.

27323.

27323.

INTERNAL PRESSURE , P  > P. R= 9 2 %&

T+%$

1&5

1&5

1&5

1&5

4@7.6

4@7.6

4@7.6

4@7.6

NOTES 1. ALL STRESS *ALUE IN A$O*E TA$LE IS IN SI. !. INTERNAL DESIGN RESSURE 'ONSIDERED IN A$O*E 'AL'ULATION IS &.0 $ARG RESULT MA : 1.0 ALLO#A$LE LIMIT FOR 'OM$INED STRESS IN 'ASE OF SEISMI' LOADING : 1.5 . S. E ? &0000 SI ALL STRESS ARE WELL WITHIN LIMIT H ENCE DESING IS SAFE

" OF 11

SUVIDYA INSTITUTE OF TECHNOLOGY


P*&&* V&& D&0/ M$$ < D0& R. M+&&

DESIGN OF LUG SUPPORT MEMBERS

:

HEIGHT OF LUG SUORT

!&.00 in



+$'D , SHELL OD-  !

1!.00 in

<

3;M

14.50 in

%<

THI'(NESS OF $ASE LATE

%

THI'(NESS OF 'OMRESSION LATE , NOT RO*IDED ANGLE OF 'ONTA'T

1.00 in 0 in )1 37



DISTAN'E $ET#EEN '.L. OF GUSSET

15.5) in

l

LENGTH OF $ASE LATE

1%.00 in

%/

GUSSET THI'(NESS

0.5) in

%&

SHELL THI'(NESS

0.5 in

%'

THI'(NESS OF R.F. AD

0.5 in



NO. OF GUSSETS ER LUG

! No

(INDL> NOTE THAT #E HA*E NOT IN'LUDED 'OMRESSION LATE AND HEN'E DIMENSION @ AND  IS NOT ALI'A$LE

9 OF 11



P*&&* V&& D&0/ M$$ < D0& R. M+&&

DESIGN OF GUSSETS AND BASE PLATE

7

ASSUMED THI'(NESS OF GUSSETS



*ERTI'AL LOAD ON LUG , REFER AGE & FOR ! ANGLE OF 'ONTA'T

0.5) in 15000 /b )1 37.

a

. SIN θ

1&110.0 /b

b

. 'OS θ

%!)0.0 /b

'

b. SIN θ / 2

).&4 in

A

7. '

&.55 in!

F

>IELD STRESS OF GUSSETS

&)000 SI

Fa

ALLO#A$LE A
14400 SI

Fb

ALLO#A$LE $ENDING STRESS : 0.). F

!1)00 SI

2

7. '!  )

Mb

b  n A

10!!."% /b.in

fa

a  n. A

1"4%.0" SI

fb

Mb  2

&.%5 in&

!%!."9 SI

INDU'ED A
$

$EAM SUORT #IDTH UNDER $ASE LATE

l4

DISTAN'E $ET#EEN T#O GUSSETS $OLT HOLE DIAMETER

) in 15.00 in 0.9" in

BENDING MOMENT IN TENSION  (M<) M<

.l / 6

4!500 /b.in

UNIFORM BEARING LOAD ON BASE PLATE  () 

  a. l

14%.0) SI

10 OF 11

SUVIDYA INSTITUE OF TECHNOLOGY M=<$0 -  @@


P*&&* V&& D&0/ M$$ < D0& R. M+&&

DESIGN OF GUSSETS AND BASE PLATE BENDING MOMENT DUE TO BEARING LOAD M<

C. l1!  10

M<

GREATER MOMENT FROM TENSION OR $EARINGG

&&0"."! /b.in

4!500 /b.in

REUIRED BASE PLATE THIC!NESS  (%<) bB

+ ). Mb  +b , φ - Fb-0.5

0.9&5 in

%<

RO*IDED $ASE LATE THI'(NESS

1.00 in

HENCE DESIGN IS SAFE

,6,6,6,

11 of11

Lug Support Design

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