Tail Lifting Lug Calculation MS Word
Tail Lifting Lug Calculation MS Word
Tail Lifting Lug Calculation MS Word
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PLEASE NOTE: "Lift Lug calc for Skid" has links with "Weight & Bolting_lse.xls" These may be downloaded separately
or together as a zip file.
LIFTING LUG DESIGN CALCULATION (SKID)
ITEM : C.I. SKID (A-6810)
PROJECT NO. C.I Injection system (A-6810) - Permas Field Substructure
No of lug eye,
Maximum combined force acting on lug eye, Fc
Ts
DESIGN LOAD:
SLING TENSION P = FOS * Ts P
LIFTING ANGLE a
ACTUAL OUT OF PLANE ANGLE b
VERTICAL FORCE ON PADEYE Fz = P * sin a Fz
OUT OF PLANE FORCE Fyl = P * sin b Fyl
HORIZONTAL FORCE ON PADEYE Fx = P * cos a Fx
Horizontal dist.PIN CL to N.A. exl
STRESS CHECK AT BASE
Moment Calc at distance , H
In Plane Moment My = ( Fx*H ) - ( Fz*ex l) My
Out of plane moment Mx = ( FyI*hL ) Mx
Tensile Stress
Maximum tensile force, ft = Fz / [ tL * wL ]
Allowable tensile stress, St.all ( = 0.6Sy )
Since ft < St.all, therefore the lug size is satisfactory.
Bending stress (In Plane)
Maximum bending stress , fbx = ( 6*Mx ) / ( wL * [(tL+tcp)^2] )
Allowable bending stress, fbx.all ( = 0.66Sy ) _In Plane
Since fbx < fbx.all,therefore the lug size is satisfactory.
Bending stress (Out of Plane)
Maximum bending stress , fby = ( 6*My ) / [ tL +(2*tcp)] * [ wL^2 ] )
Allowable bending stress, fby.all ( = 0.75Sy ) _Out Of Plane
Since fby < fby.all,therefore the lug size is satisfactory.
Combined stresses,
U
= St/St.all + fby/fby.all + fbx/fbx.all
Since U < 1, therefore the lug size is satisfactory.
SHEAR stress (In Plane)
Maximum SHEAR stress , fsx = Fx / [ wL * tL ]
Allowable shear stress, Ss.all ( = 0.4Sy )
Since fsx < Ss.all,therefore the lug size is satisfactory.
Bending stress (Out of Plane)
Maximum SHEAR stress , fsy = Fyl / [ wL * tL ]
Allowable shear stress, Ss.all ( = 0.4Sy )
Since fsx < Ss.all,therefore the lug size is satisfactory.
CHECKING VON-MISES CRITERIA
Sum of stress in X-PLANE
Sum of stress in Y-PLANE
fx = St + fby
fy = St + fbx
Shear Stress