Skirt Support Design

SUVIDYA INSTITUTE OF TECHNOLOGY Mumbai : 400055

SAMPLE DESIGN CALCULATION - SKIRT SUPPORT DESIGN OF VERTICAL COLUMN REFE REFERE RENC NCE E

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1 OF 8


SAMPLE DESIGN CALCULATION - SKIRT SUPPORT DESIGN OF VERTICAL COLUMN REFERENCE

Pressure Vessel Design Manual by Dennis R M!ss

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% OF 8


SAMPLE DESIGN CALCULATION - SKIRT SUPPORT DESIGN OF VERTICAL COLUMN REFERENCE

Pressure Vessel Design Manual by Dennis R M!ss

SEISMIC MOMENT CALCULATION FIND OUT ,ASE SHEAR ? 1 V. 2

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3 OF 8


SAMPLE DESIGN CALCULATION - SKIRT SUPPORT DESIGN OF VERTICAL COLUMN COM,INED STRESS ANALYSIS COM,INED STRESS ANALYSIS TO ,E CARRIED OUT FOR FOLLO"ING CONDITION A

ERECTION CONDITION

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OPERATING CONDITION

C

TESTING CONDITON

STRESS SHALL ,E CALCULATED INDUCED DUE TO A

DEAD 'EIG*T

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INTERNAL PRESSURE

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EFFECT DUE TO INTERNAL AND EKTERNAL PRESSURE TO "E IGNORED DURING ERECTION STAGE ALLO'A"LE STRESS CALCULATED AT AM"IENT CONDITION 'ELD EFFICIENT) : 0.85

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EFFECT DUE TO INTERNAL AND EKTERNAL PRESSURE TO "E IGNORED DURING ERECTION STAGE ALLO'A"LE STRESS CALCULATED AT AM"IENT CONDITION 'ELD EFFICIENT) : 0.85

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ALLO'A"LE STRESS CALCULATED AT DESIGN TEMPERATURE. 'ELD EFFICIENT) : 0.85 *)DROSTATIC TEST PRESSURE IS 1.5 TIMES DESIGN PRESSURE > EFFECT DUE TO STATIC *EAD SUC* "IG COLUMN *)DROTESTD IN *ORIONTAL CONDITION IN 'ORS*OP EKTERNAL PRESSURE 'ILL "E ERO IN A"OVE CALCULATION

CONCLUSION STRESSES INDUCED DURING DIFFERENT CONDITIONS ARE "ELL "ITHIN IN ALLO"A,LE LIMITED AND HENCE PROVIDE THIC:NESS ARE ADEUATE

11000.00


SAMPLE DESIGN CALCULATION - SKIRT SUPPORT DESIGN OF VERTICAL COLUMN REFERENCE Pressure Vessel Design Manual by Dennis R M!ss

ANCHOR ,OLT CALCULATION @ EUIVALENT AREA METHOD REFER TA,LE 333 FOR NO OF ,OLTS SHELL O>D

N

RECOMMENDED MINIMUM NOOF ANCHOR ,OLTS

8 N6

RECOMMENDED MAIMUM NOOF ANCHOR ,OLTS

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NO OF ,OLTS ASSUMED

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MATERIAL OF CONSTRUCITON FOR ANCHOR ,OLTS Fs

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SELECTED ,OLT DIAMETER & )=(K HENCE O: STRESS IN EUIVALENT STEEL ,AND ? 1 -s 2 -s

1 N Ra 2 > 1 %i $ 2

0.0180 i

EUIVALENT TENSILE STRESS IN ANCHOR ,OLT ? 1 +s 2 +s

T > 1-s  r  C- 2

%3.+ PSI

COMPRESSIVE LOAD IN CONCRETE ? 1 C 2 C

T  "b

143++4.%3 /b

EUIVALENT COMPRESSIVE STRESS IN CONCRETE ? 1 +9 2 +9

C > 1 1  @ - s 2n -srC9 2

5%+.0% /b

RECHEC:ING  :  USING ACTUAL +s an$  +9 :

 ' > 1 '  1+s > n+922

0.501 /b

SINCE THIS VALUE OF  :  IS DIFFERENT THAN THAT "AS ASSUMED HENCE RECALCULATE

5 OF 8



ANCHOR ,OLT CALCULATION @ EUIVALENT AREA METHOD TRIAL @ / APPROIMATE VALUE OF  :  

'IDT* OF "ASE PLATE

: n

5.50 i 0.300

RATIO OF MODULUS OF ELASTICIT) OF STEEL TO CONCRETE REFER TA"LE 3.35B

1%

COEFFICIENT FROM C*ART C9

1.51

C-

%.44%



0.+81

J

0.438

TENSILE LOAD IN STEEL ? 1 T 2 T

1Mb @ "b @ J$ 2> $

8481.3 /b

REUIRED ROOT AREA ? 1Ab2 Ab

1 T %i  $ > Fs  r  C- 2

ROOT AREA OF ONE ,OLT & Ab > N Ra

PROVIDED ROOT AREA

1.148 i% 0.05+ i% 0.30% i%

SELECTED ,OLT DIAMETER & )=(K HENCE O: STRESS IN EUIVALENT STEEL ,AND ? 1 -s 2 -s

1 N Ra 2 > 1 %i $ 2

0.0180 i

EUIVALENT TENSILE STRESS IN ANCHOR ,OLT ? 1 +s 2 +s

T > 1-s  r  C- 2

0%0.4 PSI

COMPRESSIVE LOAD IN CONCRETE ? 1 C 2 C

T  "b

143+5.88 /b

EUIVALENT COMPRESSIVE STRESS IN CONCRETE ? 1 +9 2 +9

C > 1 1 @ -s 2n - srC9 2

5%%.%4 /b

RECHEC:ING  :  USING ACTUAL +s an$  +9 :

 ' > 1 '  1+s > n+922

0.510 /b

NO" CALCULATED VALUE OF : IS VERY CLOSE TO ASSUMED VALUE AND SIJING IS ADEUATE SUMMARY $b

SIE OF "OLT DIAMTER

N

NO. OF "OLTS



'IDT* OF "ASE PLATE MOC OF SELECTED "OLTS

0.+5 i 8 N6. 5.50 i SA3

 OF 8



DESIGN OF ANCHOR CHAIR SELECTED T)PE OF ANC*OR C*AIR  T)PE 3

R -s

OUT SIDE RADIUS OF S:IRT SH ELL S:IRT SHEL L THIC:NESS

30.000 i 0.4+% i

a

% i

9

1.5 i

e

9 @ 1$b>/2

. l

1.1%5 i 1% i

a9

3.5 i

-9

COMPRESSION PL AT E T HIC:NESS

1.00 i

-b

,ASE RING THIC:NESS

1.00 i



"i$-. !+ ,ase Ring

b

SPACING ,ET "EEN T "O GUSSETS

A

COMPRESSION PLATE "IDTH

-g

GUSSETS THIC:NESS

0.5 i

$

,OLT CIRCLE DIAMETER

4 i

N

NOOF ANCHOR ,OLTS

$b

DIAMTER OF ,OLT HOLE IN ,ASE PLATE

bs

SPACING ,ET"EEN ANCHOR CHAIR

Fs

ALLO"A,LE TENSILE STRESS FOR ANCHOR ,OTLS0 1REFER TA,LE 3352

Ra

PROVIDED ROOT AREA

5.5 i %.500 i 4.5000 i

8 N6. 1.+5 i %1.3 i 1000 PSI 0.30% i%

+ OF 8


SAMPLE DESIGN CALCULATION - SKIRT SUPPORT DESIGN O F VERTICAL COLUMN REFERENCE Pressure Vessel Design Manual by Dennis R M!ss

DESIGN OF ANCHOR CHAIR

,ASE PLATE DESIGN @ TYPE 3 CHEC:ING THIC:NESS ,ET"EEN T"O GUSSETS MAIMUM ANCHOR ,OLT FORCE ? 1P2 P

Fs  Ra

5+38 /b

,ENDING MOMENT ? 1M!2 M!

P b > 8

1+3.1%5 /b. i

REUIRED THIC:NESS ? 1 -b2 -b

 1 6  M!2 > 1 1@$b2Fs2  )(

0.38 i

CHEC:ING THIC:NESS ,ET"EEN T"O ANCHOR CHAIR RATIO

l >

bs

0.1%

,ENDING MOMENT PER UNIT LENGTH @ REFER TA,LE 336 M<

)))3=7 +9 b /

My

@)56( +9 l

M!

GREATER OF M< !r My

1%.3+ /b. i

/

%+4.83 /b.i

%+4.835 /b.i

REUIRED THIC:NESS ? 1 -b2 -b

 1 6  M!2 > Fs  )(

0. i

-b

GREATER OF A,OVE

0. i

PROVIDED ,ASE PLATE THIC:NESS ? 1 -b 2

1.00 i

COMPRESSION PLATE THIC:NESS CHEC: @ TYPE 3 MINIMUM THIC:NESS OF TOP PLATE ? -9 -9

 1 P > Fs e 21)3=(b @ )// $b2  )(

0.385 i

PROVIDED TOP COMPRESSION PLATE THIC:NESS ? 1-92

1.00 i

GUSSET PLATE THIC:NESS CHEC: @ TYPE @3 REUIRED GUSSET THIC:NESS ? 1 -g 2 -g

P > 1 '8))) l2  3>8 K

0.011 i

PROVIDED GUSSET PLATE THIC:NESS ? 1-g2

0.50 i

S:IRT SHELL THIC:NESS CHEC: @ TYPE 3 J

' /

0.000+3% )(

/

1'==  A . 2> 1R -s2  1-b > -s2   '

4%4.00 PSI S

SINCE S  /())) PSI0 HENCE PROVIDED SHELL THIC:NESS IS ADEUATE

8 OF 8

Skirt Support Design

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