1/19/15 Lifting Sling Capacity Equations, Calculator and Considerations - Engineers Edge

www.engineersedge.com/mechanics_machines/sling-load-calculator-equations.htm 1/2

Share

Lifting Sling Load Equations and Calculator

Mechanics and Machines Calculations Menu

Application of Slings for lifting considerations and sling lifting load calculations (bottom).

Slings should have a minimum design factor appropriate to the type of material asspecified in the appropriate section.Features that affect

the rated capacity of the sling and that shall be considered in calculating the design factor are:

Nominal breaking strength of material from which it is constructed.

Splicing or end-attachment.

Number of parts in the sling.

Type of hitch (e.g., straight pull, choker hitch, or basket hitch).

Angle of loading and load center of gravity.Diameter of curvature around which the sling is bent.

The center of gravity of an object is a point around which the entire weight may be concentrated. To make a level lift, thecrane hook or point of suspension must be directly above this point. While slight variations are usually permissible, if the

crane hook is too far to one side of the center of gravity, dangerous tilting will result and should be corrected at once. For

this reason, when the center of gravity is closer to one point of the sling attachment than to the other, the slings must be of

unequal length. Sling stresses and sling angles will also be unequal.

. Rigging shall be configured such that slings do not reeve or slip through the hook. To attach the load, locate the center of

gravity, position the crane hook directly above the center of gravity, and then rig the load so that it will lift level and true.

Front Page Engineering Store

Engineering Forum

Engineering News

Engineering Videos

Engineering Calculators

Site Directory

Engineering Jobs

GD&T Training ASME

Y14.5-2009 DFM DFA Training

Advertising Center

Print Webpage

Copyright Notice

Calculation by Sling Angle

1,200.00

More

1/19/15 Lifting Sling Capacity Equations, Calculator and Considerations - Engineers Edge

www.engineersedge.com/mechanics_machines/sling-load-calculator-equations.htm 2/2

Copyright 2000 - 2015, by Engineers Edge, LLC www.engineersedge.com All rights reserved

Disclaimer | Feed Back | Advertising | Contact

Total Weight (W) 1,200.00 lbs Input Variable

Weight on EQUAL loaded slings 600.00 lbs

Sin(a1)= 0.85 Sin(b2)= 0.71

Cos(b1)= 0.52 Cos(b2)= 0.71

Sling angle a1= 58.52 Deg. Sling Angle a2= 45.00 Deg.

Vertical weight Sling V1 600.00 lbs Vertical weight Sling V2= 600.00 lbs

Horizontal tension point H1 367.39 lbs Horizontal tension point H2= 600.00 lbs

Tension weight sling T1 703.55 lbs Tension weight sling T2= 848.53 lbs

Calculation by Sling Length

Total Weight (W) 1,200.00 lbs

Vertical Weight on EQUAL loaded slings 600.00 lbs

Sling Length L1= 60.00 inches Sling Length L2= 60.00 Inches

Vertical Length V1= 40.00 inches Vetical Length V2= 40.00 Inches

Horizontal Length h1= 44.72 inches Horizontal Length h2= 44.72 Inches

sin(a1) = 0.75 sin(a2) 0.75

cos(a1)= 0.67 cos(b2) 0.67

Angle a1 = 48.19 Deg. angle a2= 48.19 Deg.

Angle b1 = 41.81 Deg. angle b2= 41.81 Deg.

Vertical weight Sling V1= 600.00 lbs Vertical weight Sling V2= 600.00 lbs

Horizontal tension point H1= 536.66 lbs Horizontal tension point H2= 536.66 lbs

Tension weight sling T1= 804.98 lbs Tension weight sling T2= 804.98 lbs

Import Aluminum ProductsFind Global Buyers and Importers. Sheet, Foil,

Bar, Profile, Wire