g 9.81 m/s2
W 1.2 MT
n 2
LF 4
1 60 deg.
2 53 deg.
Fy Plate Steel SA-516 Gr.70 260 MPa
Fy(w) E70xx Electrode 393 MPa
7.7 kN
0.784 MT
6.4 kN
0.651 MT
7.7 kN
0.784 MT
Design Sling Load P = SL static x LF 30.8 kN
= 3.1 MT
Angle b/w Sling and Horizontal = (SLstatic)= 1 60 deg.
1.2 Allowable Stresses
Assuming that the allowalble stress of welding metal is equal to the allowable stress of the base metal
According to AISC code, the allowable stresses are as follow
- Bearing Stress Fb = 0.9 x F y 234.0 MPa
- Shearing Stress Fs = 0.4 x F y 104.0 MPa
- Tension Stress Ft = 0.6 x F y 156.0 MPa
- Von Mises Stress Fvon = 0.85 x F y 221.0 MPa
2.1 Shackle
- Shackle Type CROSBY G-2130 Bolt-Type Anchor Shackle
- Rated Safety Working Load SWL ( SLstatic) 3.25 MT
- Pin Diameter Dp 19.1 mm
- Inside Width W in 26.9 mm
- Inside Height Hin 60.5 mm
2.2 Sling (based on EN13141-1 Table 4 and SL static )
- Sling Type Steel Cored Rope Class 6x36, Grade 1770
Sling Nominal Diameter Ds 18 mm
3.1 Padeye Dimensions
- Pinhole Diameter Dh 24 mm
Pinhole Radius Rh 12 mm
- Main Plate Thickness Tm 20 mm
- Main Plate Radius Rm 40 mm
- Main Plate Length Lm 120 mm
Left Static Sling Load
Right Static Sling Load or
3. Padeye Design
Static Sling Load or
2. Lifting Sets Sizing
PADEYE CALCULATION - PIG LAUNCHERThis Spreadsheet performs design and check as per the guidelines of API RP 2A-WSD, AWS D1.1 and AISC Code
1.1
0. Input Data
1. Initial Calculation
Refer to the latest Revision of "Lifting Arrangement Drawing for Pig Launcher No. SVSW-004101-D38-0001" for full information Acceleration of Gravity
Total Liftting Weight
Left Angle b/w Sling and Horizontal
Load Factor
Number of Sling
Right Angle b/w Sling and Horizontal
Yield Stress
or
SLstatic = max (1, 2)
SL1 =
SL2 =
Page 1 of 4
- Pinhole CL to Padeye Base Hm 75 mm
- No. of Cheek Plate / Pinhole nc 0
- Check Plate Diameter Dc 0 mm
Check Plate Radius Rc 0 mm
- Cheek Plate Thk. Tc 0 mm
3.2 Padeye Dimension and Clearance Checking
- Main Plate Radius shall not be less than 1.5 times of Pinhole Diameter
40 36 PASS
- Clearance C2 b/w Padeye thk. and Shackle inside width shall be less than 25% of Shackle inside width
or less than 12mm, whichever is larger
6.9 12 PASS
- Vertical Clearance C3 b/w sling and top edge of padeye shall not be 0.5 x sling Diameter
14.5 9 PASS
4.1 Bearing Stress
- Min. Bearing Area Required Ab(min) 131 mm2
- Available Bearing Area Ab 382 mm2
- Unity Check UCb 2.91 PASS
Unity Check conforms to the Specification for Pressure Vessel
4.2 Tear-out Stress
4. Padeye Allowable Stresses Checking
1.5
() 0.5
= ( + )
= /
= /()
+ 25% or 12mm
1.5
Page 2 of 4
- Min. Shear Area Required As(min) 296 mm2
- Total Shear Area As 1120 mm2
Main Plate Shear Area As(m) 560 mm2
Cheek Plate Shear Area As(c ) 0 mm2
- Unity Check UCs 3.79 PASS
Unity Check conforms to the Specification for Pressure Vessel
4.3 Tensile Stress across the pinhole
- Min. Tensile Area Required At(min) 197 mm2
- Total Tensile Area At 1120 mm2
Main Plate Tensile Area At(m) 1120 mm2
Cheek Plate Tensile Area At(c ) 0 mm2
- Unity Check UCt 5.68 PASS
Unity Check conforms to the Specification for Pressure Vessel
4.4 Stresses at Padeye Base Section
4.4.1 Section Properties
- Section Area 2400 mm2
- Dist from pinhole CL to section N.A 75 mm
- Section Modulus 48000 mm3
8000 mm3
4.4.2 Acting Forces and Moments
- In-plane Bending Moment 1153656 Nmm
- Out-plane Bending Moment 115366 Nmm
- Tensile Force 26642.54 N
- In-plane Shear Force 15382 N
Out-plane Shear Force 1538 N
Total Shear Force 15459 N
4.4.3 Acting Stresses
- Acting Tensile Stress 11.1 MPa
Tensile Unity Check 0.07 PASS
- Acting In-plane Bending Stress 24.0 MPa
Bending(in-plane) Unity Check 0.10 PASS
- Acting Out-plane Bending Stress 14.4 MPa
Bending(out-plane) Unity Check 0.06 PASS
- Combined Bending & Tensile Check 0.24 PASS
- Acting Shear Stress 6.4
Allowable Shear Stress Checking 0.06 PASS
= ( )
= ( )
= 2 [ +()]
= /
= /
= +()
= ( )
= ( )
= /()
= /()
=
=
= ( 2)/6
= ( 2)/6
= . .
= (5%).
= .
= .
= 5%
= (2 +
2)1/2
= /
= / 1
= /
= / 1
= /
= / 1
= + + 1
= /A
= / 1
Page 3 of 4
- Von Mises Stress 50.8
Allowable Bending Stress Checking 0.23 PASS
4.5 Weld Stress
4.5.1 Weld Stress between Padeye and Reinforcement Pad
- Weld size w1 12 mm
- Length of weld (both side) L1 240 mm
- Area of Weld Aw1 2036 mm2
- Section Modulus of Weld Sw1 57600 mm3
- Tensile Weld Stress 13 MPa
Tensile Unity Check 0.08 PASS
- Shear Weld Stress 8 MPa
Shear Unity Check 0.07 PASS
- Bending Weld Stress 20 MPa
Bending Unity Check 0.09 PASS
4.5.2 Weld Stress between Reinforcement Pad and Barrel
- Weld size w2 12 mm
- Reinforcement Pad length Lp 160 mm
- Reinforcement Pad width Wp 100 mm
- Length of weld L2 520 mm
- Area of Weld Aw2 4412 mm2
- Section Modulus of Weld Sw2 294400 mm3
- Tensile Weld Stress 6 MPa
Tensile Unity Check 0.04 PASS
- Shear Weld Stress 3 MPa
Shear Unity Check 0.03 PASS
- Bending Weld Stress 4 MPa
Bending Unity Check 0.02 PASS
Conclusion
As per the results shown above, Padeye conforms to the lifting conditions.
SWL = 3.1 (T), Factor of Safety is 4
= [ + + )2 + 32
1/2
= / 1
= / 1
=
= 0.707 1
= 2
1 = /1
1 = /1
= 2 [( 2)/6]
1 = /1
1 = 1/ 1
1 = 1/ 1
1 = 1/ 1
=
= 0.707 2
= 2 ( + )
2 = /2
= /2
= [ ] + 2 [( 2)/6]
2 = /2
2 = 2/ 1
2 = 2/ 1
2 = 2/ 1
=
=
Page 4 of 4