LIFTING LUG ANALYSIS Per AISC 13th Edition ASD Manual, ASME B TH-1-2008, and "Design and Construction of Lifting Be ams" by David T. Ricker
Project Name:
2nd STAGE SEPARATOR - (HAMMAR IPF, ZUBAIR IPF, RAFIDIYA IPF)
Client:
Project No.:
PE12015R
Prep. By:
ENI - WEATHERFORD Date:
A.B.
22/04/2013
Input: Design Parameters:
Lug Yield Strength, F y =
275
MPa
Lug Ult. Strength, F u =
430
MPa
Edge Dist., a =
145
mm
Edge Dist., e =
120
mm
Lug Width, b =
360
mm
Rounded Edge? =
Yes
Will Pin Rotate Under Load? =
No
Hole Diameter, Dh =
70.0
mm
Pin Diameter, D p =
68.0
mm
Pin Ultimate Strength=
800.0
Lug Thickness, t = Reinf. plate thickness, t p =
mm
15.0
mm
AISC Factor of Safety, F.S.1 =
5.0
AISC Factor of Safety, F.S.2 =
3.2
ASME Factor of Safety, F.S.3 =
3.0
Total weight of Skid, W =
199.1
Number of Lug, Lug, N=
1.0
CHECK
MPa
25.0
F.S.2 = max{3, Fy/(Fu/F.S.1)} Assuming Category B lifters kN
OK
1.425629176
AISC Preferred Geometry
ASME Notation
AISC Alternate Geometry
Results: Check Geometry:
Check 1:
O.K.
dh - dpin > 0, Pin fits in hole, O.K.
Check 2:
O.K.
a >= max(0.5*dh,2*t), Plate Proportions are O.K.
Check 3:
O.K.
e >= 0.67*dh, Plate Proportions are O.K.
Check 4:
N.G.
aeff =
87.5
mm
dh*1.25 controls
amax =
66.0
mm
a,max = 2*t+16
ause =
66.0
mm
Use, a,max in design
e < 1.33*a, Use a,eff = min(a, 3*e/4, 4*t, dh*1.25) in design
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Tensile Strength of Lifting Lug ( AISC Eqn. D5-1):
P1 =
283.80
P1 = (2*a,use*t*Fu) / F.S.1
kN
<=============== Controls
Bearing Capacity of Lifting Lug (AISC Eqn. J7-1):
P2 =
N/A
P2 = (1.8*Fy*t1*dpin) / F.S.2
kN
Per Ricker, only check bearing capacity if pin is "snug" in hole
Tearing Tension Capacity of Lifting Lug (Ricker pg 152):
P3 =
738.62
P3 = {(1.67*Fy*t*e^2)/dh} / F.S.2
kN
Per Ricker pg. 152, Fb is used instead of Fy, but Fb = Fy/F.S.2
Shear Capacity (Shear Rupture) of Lifting Lug (AISC Eqn D5-2):
P4 =
309.60
P4 = (0.6*Fu*2*t*e) / F.S.1
kN
Per AISC Eqn. D5-2, Asf = 2*t*(e+dh/2), cons. to assume dh/2=0)
Gross Section Yielding of Lifting Lug (AISC Eqn D2-1):
P5 =
774.00
P5 = (Fy*t*b) / F.S.2
kN
Tensile Strength of Lifting Lug ( ASME Eqn. 3-45): Cr = 1 - 0.275*sqrt{1 - (dpin^2 / dh^2)}
Cr =
0.935
aeff =
94.5
mm
a, eff = min(a, 4*t, 0.6*a*(Fu/Fy)*sqrt(dh / a)
P6 =
527.65
kN
P6 = (Cr*Fu*2*t*a,eff) / (1.2*F.S.3)
Single Plane Fracture Strength of Lifting Lug (ASME Eqn. 3-49):
R=
155.0
mm
R = e+(dh/2)
P7 =
481.76
kN
P7 = [(Cr*Fu)/(1.2*F.S.3)] * [1.13*(R-.5*dh)+(0.92*a,eff)/(1+a,eff/dh)] * t
Double Plane Fracture Strength of Lifting Lug (ASME Eqn. 3-50):
f=
53.43
deg.
f = 55*(dpin / dh)
Z' =
2.42
mm
Z' = R - sqrt{R^2 - [(dpin/2)*sin(f)]^2}, only applicable for rounded edges
2
Av =
6565.9
mm
Av = 2*{e+0.8*dpin*[1-cos(f)]-Z'}*t
P8 =
548.98
kN
P8 = (0.7*Fu*Av) / (1.2*F.S.3)
Bearing Capacity of Lifting Lug (ASME Eqn. 3-53):
P9 =
428.54
kN
P9 = (1.25*Fy*dpin*t1) / F.S.3
Pallow =
283.80
kN
Pallow = min(P1, P2, P3, P4, P5, P6, P7, P8, P9)
kN
Assuming fillet weld and F.S. = 5.0 against Fexx. Use Pdesign
Summary:
Required Weld Strength for Vertical Load:
Pdesign =
425.70
to design welds using 0.3*Fexx*0.707*weld size. Could also use Pallow, but need to use 0.2*Fexx*0.707*weld size for F.S. = 5.0.
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PIN ANALYSIS "Machine Design" An Integrated Approach by Robert L. Norton
Dh
70.0 mm
D p
68.0 mm
t
55 mm
Design Parameters:
Poisson's ratio, υ =
0.3 none
Total weight of Skid, W =
199.07 kN
Number of Lug, N= Force (weight), F =
1.0 none 199.07 kN
Young's modulus, E = Material Constants, m 1, m2 =
2.05E+05 MPa
Geometry factor, B = Half-width of contact patch, a =
0.0004 1/mm
4.44E-06 1/MPa
W/N (1- υ
)/E
6.978 mm
(Dh-Dp)/(Dh*Dp) (2*(m 1+m2)*F)/(B*L*π)
767.54 mm
2aL, L is contact length
Pavg =
259.4 MPa
F/A
Pmax =
330.2 MPa
2F/(πaL)
τ13 =
100.4 MPa
0.304Pmax
Area, A = Results: Avg pressure in contact patch
Max Pressure in contact patch
Mximum shear stress
The ultimate tensile strength of material
Su =
800.0 MPa
The ultimate shear strength of material
τu = τu
536.0 MPa
>
τ13
0.67*Su (0.67~0.75) OK
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BOLTED CONNECTION ANALYSIS Per AISC 13th Edition ASD Manual (Sect. J.3 - ASD) BOLTS Input Data:
N° of Bolts
0
Bolt Diameter
0
NOMINAL STRENGTH
mm ASTM A325 or 8.8
Class of Bolts Threads parts are not excluded from shear plane
Fnt
620
MPa
Fnv
372
MPa
YES
Shear Action
(ASD)
199.07
kN
R n/Ω
(ASD)
0.00
kN
CHECK BEARING STRENGTH AT BOLT HOLES Input Data:
Thickness of plate
20
mm
Clear distance
42
mm
16
mm
Nomina Bolt Diameter Plate Material
S275
Fu
430
Shear Action
(ASD)
R n/Ω
(ASD)
kN
165.12
kN
CHECK
FLEXURE & TENSION CHECK AT LIFTING LUG BASE SECTION (ASD AISC H.1.2) Input Data:
Thickness of plate
25
mm
Width of plate at the base
360
mm
Out of Plane of Axial Action
5
%
165
mm
Wy,pl
56250
mm
Mcy
9.26
kNm
Mry
1.64
kNm
Pc
1482.04
kN
Pr
199.07
kN
Heigth of Lifting Lug Eye
3
0.24 CHECK
OK
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LIFTING LUG DRAWING
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