Lug Support

LEG SUPPORT DESIGN REPORT Design Pressure Design Temperature Vessel Outside diameter Vessel thickness Corrosion allowance Pad circumference distance Pad longitudinal distance Pad thickness Vessel OD to bolt centre

P T D ts CA C11P C22P tp Dlug

= = = = = = = = =

Bolt circle diameter of lug

Db

=

1922 mm

Circumferential Length of top plate Radial Width of Top Bar Plate

Lpl Wtp

= =

250 mm 70 mm

Thickness of Top Plate

Ttp

=

12 mm

Circumferential Length of bottom plate

Lpl

=

250 mm

Radial Width of bottom Support Lug Plate

wpl

=

253 mm

Thickness of Gusset Plate

Tgp

=

10 mm

Height of Gusset Plate Mean Width of Gusset Plate

Hgp wgp

= =

350 mm 161.5 mm

Distance between Gussets

Dgp

=

200 mm

Thickness of bottom Support Lug Plate

Tpl

=

12 mm

Lug support force bearing width Yield strength of material Allowable stress Sallowable = 2/3 Fy

Wfb = Fy = Sallowable =

Bolt Material Bolt allowable stress at design temperature Root area of single bolt Bolt Diameter Number of lug Overturing moment Operating weight of vessel

13.728 85 1500 8 0 300 430 8 203

bar Deg C mm mm mm mm mm mm mm

75 mm 132.15 N/mm2 88.1 N/mm2 SA-36 172.38 N/ N /mm2 3.4 cm2 24 mm

N M W

= = =

4 mm 1790 Nm 31780 N

Flug

=

8876.3 N

Stpl

=

16.417 N/ N / m m2

Ttpr

=

2.2361 mm

Ba

=

18750 mm2

Force on one Lug, Operating Condition

  =

 

+

4 

Top Bar Plate Stress per Bednar p.154 S  =

0.75 × F  × D  × L  T  × W × H

Required thickness of top plate

  =

0.75 0.75 × F  × D  × L  S  × W × H

Bearing Area

 =   × 

Bending Stress in bottom Plate (Unif. Load) Per Bednar p.156

 =

  ×  / ×    

here β = 2.105

Spl

=

38.926 N/mm2

Tplr

=

7.9766 mm

t rAD

=

10.409 mm

Sgp

=

2.7481 N/mm2

Tgpr

=

0.3119 mm

SgpB

=

6.3325 N/mm2

SgaB

=

60.39 N/mm2

Bottom Plate Required Thickness (Uniform Load)

 =

  ×  / ×   

Bottom Plate Required Thickness based on ADM S 3/4

   × 

   = 0.71 ×  ×



Gusset Plate Axial Stress ( Force / Gusset Plate Area )



 2 =   × 

Required gusset plate thickness



 2 =   × 

Gusset Plate Allowable Stress Maximum Compressive Gusset Plate Stress per Bednar

 =

  × 3 ×  −     ×  ×  ∝



Gusset Plate Allowable Compressive Stress

 =

18000 1 1+ × 18000

  ∝ 0.289 × 

2