three saddle supports for horizontal vessel

7/27/2019 Three Saddle Supports for Horizontal Vessel

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HG/T20582-1998

JB/T4731-2005

Calculation pressure P= 0.5 Mpa

Design temperature 40

Hydrostatic test pressure Pt= 0.27 Mpa

Inside diameter of vessel Di= 8200 mm

Nominal wall thickness of shell n= 30 mm

Nominal wall thickness of head H= 30 mm

Effective thickness of shell e= 29 mmEffective thickness of head he= 29 mm

Inside diameter of shell Ri= 4100 mm

Mean diameter of shell Rm=Ri+0.5n= 4115 mm

L= 12200 mm

Depth of curved surface of head H= 1070 mm

A= 1750 mm

W= 1059355.8 N

Wt= 1059355.8 N

Ls= 1620 mm

= 150

'= 162

Pe= 29 mm

Width of saddle pad Bp= 1000 mm

bo= 29 mm

Axial width of supports b= 800 mm

This calculation sheet is prepared in accordance with HG/T20582-1998 and

JB/T4731-2005.

Total weight of vessel at hydrostatic test condition

/Doc.

Calculation of a Vessel on Three Saddles

) Length of shell (T.L to T.L)

Diatance of side support's

center line to nearest head's tangent line

Total weight of vessel at operating condition

Distance from bottom of support pad to bottom of base plate

Effective thickness of web

Saddle included angle

Included angle of saddle pad

Effictive thickness of saddle pad


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Effective width of shell b2=b+1.56Rmn0.5

= 1348.11 mm

[]t= 181 Mpa

[]ht= 181 Mpa

[]crt= 141 Mpa

[]cr= 141 Mpa

ReL= 315 Mpa

Material of web Q235-B

[]sa= 108 Mpa

Joint efficiency of vessel = 1

Coefficient k= 0.1

: k=1k=0.1

Note: If the vessel isn't welded on the saddle support,then k=1;if not,k=0.1

NO

Material of stiffening ring

Allowable stress of stiffening ring material []rt= Mpa

Area of composite section Ao= mm2

X-XMoment of inertia of composite section Io= mm4

d Dimension d (see sketch below) d= mm

e Dimension e (see sketch below) e= mm

JB/T4731C4 Coefficient C4 from JB/T4731 C4=

JB/T4731C5 Coefficient C5 from JB/T4731 C5=

JB/T4731K7 Coefficient K7 from JB/T4731 K7=

JB/T4731K8 Coefficient K8 from JB/T4731 K8=

1. calculation of shell longitudinal moment(1) Operating condition

q=W/(L+4H/3) 77.74 N/mm

Allowable stress of shell material at design temperature

Allowable axial compressive stress

of vessel material at ambient temperature

Allowable stress of head material at design temperature

YESNO Arestiffening rings used? Input "YES" or "NO".

Input the following data if the saddle has stiffening ring(s).

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Location of stiffening ging(s): input "1" if the ring is in the plane of

saddle, and "2" if it is adjacent to the saddle.

Uniform load per unit length

due to the total weight of equipment

Allowable axial compressive

stress of vessel material at design temperature

Yield strength of shell material at ambient temperature.

Allowable stress of web material


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90762896 N.mm

-229264101 N.mm

149442729 N.mm

(2) Hydrostatic test condition

qT=Wt/(L+4H/3) 77.74 N.mm

90762896 N.mm

-229264101 N.mm

149442729 N.mm

2.calculation of reactor force on the support(1) Operating condition

344425.2 N

582376.61 N

(2) Hydrostatic test condition

344425.2 N

582376.61 N

3. calculation of longitudinal stress in the shell(1) Operating condition

1Cross-section in the middle of two supports

Moment at the

center support

Moment at the

center support

Reaction of center support

Moment at the side supports

Moment at Mid-span

Reaction of side supports

Reaction of center support

Reaction of side supports

Uniform load per unit length

due to the total weight of equipment

Moment at Mid-span

Moment at the side supports

28

)2

( 2

AB

MA

Lq

M

q

AL

MMA

LqMM AB

Ap 2/

)2

(

)2

(2

1

2

2.1

)2

(

)243

2(

AL

MMALHqFF ABCA

2.1

2

)(2)

2(

AL

MMA

LqF BAB

28

)

2

( 2

ATT

BT

MA

Lq

M

T

ATBT

TATpT q

AL

MMA

LqMM 2/

)2

(

)2

(2

1

2

2.1

)2

(

)243

2(

AL

MMALHqFF A

TBT

TCTAT

2.1

2

22

AL

MMALqF TBTATTB

)23

4(

2

22

2 HRHAA

qMM mTTCTA

)23

4(

2

222 HRHAA

qMM mCA


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The highest point 35.38 Mpa

the lowest point 35.57 Mpa

2Cross-section at side supportsA/Rm= 0.425

JB/T4731K1= Refer to JB/T4731, coefficient K1= 1

35.42 Mpa

JB/T4731K2= Refer to JB/T4731 , coefficient K2= 1

The lowest point 35.53 Mpa

3Cross-section at center support

0.5L/Rm= 1.482

JB/T4731K1= Refer to JB/T4731, coefficient K1= 0.161

36.40 Mpa

JB/T4731K2= Refer to JB/T4731 , coefficient K2= 0.279

The lowest point 34.94 Mpa

4Ceck of shell longitudinal stress

mt=max{1,2,3A,3B,4A,4B}= 36.40 Mpa

*[]t= 181.00 Mpa

mt


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T1

T2

T3A

T4A

T3B

T4B

MT=max(T1,T2,T3A,T3B,T4A,T4B)= 19.30 Mpa

0.9ReL= 283.5 Mpa

MT


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H+H= 71.54 Mpa

H+H


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(2) For shells with stiffening rings

Mpa

Mpa

Mpa

Mpa

6. calculation of tensile stress in webF=max(FA,FB) 582376.61 N

K9= 0.259

Fs=F9*F 150835.54 NHs=min(Ls,Rm/3) 1371.6667 mm

9=Fs/(Hs*bo) 3.79 Mpa

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three saddle supports for horizontal vessel

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