Crane Wire Rope Minimum Breaking Load Calculator

Crane Wire Rope Minimum Breaking Load (MBL) Calculator serves as a rapid tool for estimating wire rope load capacity and carrying out model selection verification; by inputting different wire rope specifications, users can automatically and quickly compare the breaking strength of various wire rope constructions and determine their compatibility with corresponding drums. Furthermore, it assists the design of hoisting mechanism components including drums and sheaves as well as motor power verification. During later crane operation and maintenance, maintenance technicians can refer to data from this calculator to assess whether wire rope replacement is required and verify that new replacement wire ropes meet the original design safety factor standards. Therefore, selecting a wire rope with a proper MBL helps avoid overloads, lower accident risks and prolong the service life of wire ropes.

Rated Load Q (t)

Please input valid rated load

Attachment Weight Q_h (t)

Please input valid attachment weight

Sheave Ratios m

Please select sheave ratio

Composite Load Coefficient γ

Please input valid coefficient

Mechanism Type

Please select mechanism type

Wire Rope Type

Please select wire rope type

Winding Type

Please select winding type

Crane Duty Class (M Class, includes Z_p)

Please select duty class

Max Single Rope Tension S (kN): –

Minimum Required Breaking Force F (kN): –

Crane Wire Rope Minimum Breaking Load Calculator Formula

F_min≥S×Z_p

F_min: wire rope minimum breaking load
S: the maximum rope tension (unit: kN)
Z_p: the minimum design factor

Crane Maximum Rope Tension Calculation Formula

S=（Q+Qh）g/m×γ

Q: Rated lifting capacity (unit: kg)
Q_h: Total weight of the lifting device, including the hook, sheave block, lifting beam, grab bucket, hopper, and all other accessories that rise and fall with the wire rope (unit: kg)
g: Acceleration due to gravity, fixed value of 9.8 m/s²
m: Sheave block ratio
γ: Comprehensive load correction factor, generally taken as 1.1

Notes

For hoisting wire ropes, the calculation of S needs to consider the following four factors: the rated lifting capacity of the hoisting machinery, the mass of the sheave block and/or other lifting accessories, the rope winding system ratio, and the efficiency of the rope winding system (such as bearing efficiency).
The sheave block ratio of a single-drum system equals the number of load-bearing rope branches. For instance, 2 branches give a ratio m=2. For a double-drum system, the ratio is half the branch count. With 4 load-bearing branches and 2 free-end branches, m = 4/2 = 2.

Applicable Cranes and Hoists

overhead travelling cranes
hoists-wire rope
portal or semi-portal cranes
portal or semi-portal bridge cranes
mobile cranes
cantilever cranes (pillar, jib, wall or walking)

Contact Details

DGCRANE is committed to providing the professional Overhead crane products and relavent service. Exported to Over 100 Countries, 5000+ Customers Choose Us, Worth to be Trusted.

sales@dgcrane.com

+86 373 387 6188

+86 189 3735 0200

Floor 30,Gongyuan INT'I Building, Jinsui Road, Xinxiang City, Henan Province, China

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