Scribd
Upload
368 views2 pages

Tailing Lug Calculations 01

The document summarizes the design of a tailing lug used to lift equipment weighing 3,150 kg. It evaluates the shear, bearing, and bending stresses on the lug as well as the weld and connecting link sizes. All stresses were found to be below allowable limits, indicating the design is safe and components are sufficiently sized. Dimensions and material properties are provided for each component.

Uploaded by

sammar_10
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
368 views2 pages

Tailing Lug Calculations 01

The document summarizes the design of a tailing lug used to lift equipment weighing 3,150 kg. It evaluates the shear, bearing, and bending stresses on the lug as well as the weld and connecting link sizes. All stresses were found to be below allowable limits, indicating the design is safe and components are sufficiently sized. Dimensions and material properties are provided for each component.

Uploaded by

sammar_10
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

& Boyce Mfg. Co. Ltd.

, process Equipment Division, Plant - 15, Vikhroli, Mumbai - 400079

MDC No. Client : Page No. :

Job No. Consultant : Rev. :

Made By Eqpt. No. : Date :

DESIGN OF TAILING LUG

Erection weight of equipment We [ kgf ] 3,150.00


No. of lugs N [ - ] 1
Load to be lifted by lug (Half Load of Equipment) W [ kgf ] 1,575.00
Impact Factor I [ - ] 1.50
Material of lug [ - ] IS 2062 Gr A
Yield stress of lug Sy [ kgf/cm2 ] 2,345.29

R
d

fw h

w
Dimensions of lug
Width w [ mm ] 290.00
Thickness t [ mm ] 30
Diameter of hole in lug d [ mm ] 73
Radius of outer profile R [ mm ] 145.00
Height of CL of lug hole from channel cover OD h [ mm ] 205.00

Shear stress
Induced shear stress = 100WI/[2t(R-d/2)] Ss [ kgf/cm2 ] 36.29
Allowable shear stress = 0.4Sy Ssa [ kgf/cm2 ] 938.116

Since Ss < Ssa, design is safe for shear stress

Bearing stress at lug hole


Bearing stress = 100WI/(t.d) Sb [ kgf/cm2 ] 107.88
Allowable bearing stress = 0.9Sy Sba [ kgf/cm2 ] 2110.76

Since Sb < Sba, design is safe for bearing stress

Bending stress on lug


Moment = W.I.h M [ kg-mm ] 484312.5
Section modulus at bending section = t.w2/6 Z [ mm3 ] 420500.00
Bending stress = 100M/Z Sn [ kgf/cm2 ] 115.18
Allowable bending stress = 0.66Sy Sna [ kgf/cm2 ] 1547.89

Since Sn < Sna, design is safe for bending stress


& Boyce Mfg. Co. Ltd., process Equipment Division, Plant - 15, Vikhroli, Mumbai - 400079

MDC No. Client Page No. :

Job No. PMC Rev. :

Made By Eqpt. No. Date :

Weld design

Weld size fw [ mm ] 10.00


Shear load on weld = W.I Ws [ kgf ] 2,362.50
Shear stress on weld = 100Ws/(2(w+t).fw) Sws [ kgf/cm2 ] 36.91
2
Allowable shear stress = 0.4Sy Ssa [ kgf/cm ] 938.12

Since Sws < Ssa, weld size is sufficient for shear stress

Bending stress in weld

Bending moment on weld = Ws.h Mw [ kg-mm ] 484,312.50


3
Combined section modulus of welds = fw(tw+w2/3) Zw [ mm ] 367,333.33
2
Bending stress in weld = 100.Mw/Zw Swb [ kgf/cm ] 131.85
Allowable bending stress = 0.66Sy Sna [ kgf/cm2 ] 1,547.89

Since Swb < Sna, weld size is sufficient for bending stress

Shear stress in connecting link

Link rod diameter d [ mm ] 70.00


Cross-sectional area of link rod A [ mm2 ] 3848.45
Shear load on link rod = W.I Ws [ kg ] 2362.50
Shear stress Ss [ kgf/cm2 ] 0.61
Allowable shear stress = 0.4Sy Ssa [ kgf/cm2 ] 938.12

Since Ss < Ssa, link rod size is sufficient for shear stress

You might also like