CABLE REEL SPREADER BAR DESIGN

1.0 Input Data

1.1 Geometric Parameters

10" Sch60 Pipe

Outer Diameter OD 273.05mm

Inside Diameter ID 247.65mm

Pipe thickness tp OD ID( ) 0.5 12.70 mm

Pipe Length Considered Lp 2300mm

1.2 Material Properties

Yield strength fyp 235MPaYoung's Modulus, E 205000MPa

Steel density, s 7850kg

m3

Poisson's Ratio , 0.3

1.3 WeightMax. Expected Weight Wmax 60.00tonne Add 10% weight contingency

Static Hook Load SHL Wmax 0.1 Wmax 66.00 tonne

Dynamic Amplification Factor DAF 1.07 0.0510044

1.15 (DNV-OS-H205)

2.0 Detailed Calculation

Forces

Upper Sling angle 60deg Lower Sling angle 90deg 5% Lower Sling angle variation .05 4.5 deg 5% Upper Sling angle variation .05 3 deg

Load in Upper Sling Fus0.5 DAF SHL

sin ( )43.64 tonne

Load in Lower Sling Fls0.5 DAF SHL

cos ( )37.91 tonne

2.1 Pipe Compression Check Upper Sling Compressive Force in Pipe Fusc Fus cos ( ) 23.77 tonne Lower Sling Compressive force in pipe Flsc Fls cos ( ) 0.23 tonneTotal Compressive force Fcmp Fusc Flsc 24.00 tonne

Compressive Stress cmpFcmp g

OD2

4

ID2

4

22.66 MPa

Allowable Compressive Stress

Inertia Ip OD4

64

ID4

64

8.822 10

7 mm4

Ka 1.0 laLp

1000 r

Ip

OD2

4

ID2

4

0.092m

Ka lar

0.02 < Cc2 E

fyp

1

274.034

Fa

1

Ka lar

2

2 Cc2

fyp

53

3Ka la

r

8 Cc

Ka lar

3

8 Cc3

140.99 MPa

URcmpcmpFa

0.16 < 1 OK

2.2 Pipe Bending Check

Bending Due to Upper and Lower Padeye sling position and sling angle variation.

Distance db 232mm

Weight of Spreader Bar wsb OD2

4

ID2

4

s g 0.8

kNm

Bending Moment Mpb g db Fusc db Flsc 1.15 wsb Lp2

8

54.16 kN m

Bending Stress pbMpb 0.5 OD

Ip83.816 MPa

URpbpb

0.75 fyp0.48 < 1 OK

Combined Axial and Bending Check

Bending have been considered in one direction

URcombcmpFa

pb0.75 fyp

0.64 < 1 OK

3.0 Summary of Results

Compressive stress ratio URcmp 0.16Bending stress ratio URpb 0.48Combined stress ratio URcomb 0.64