Safe work load calculation of hoisting wire rope and hoist chains

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Dongqi Electric hoist safety tips on how to calculate the safety working load of you hoisting wire rope and hoist chains. Dongqi Hoist and Crane company offers types of electric hoists, hoisting wire ropes and hoist chains to meet all you needs. Get your ideal hoisting wire rope and hoist chains, and electric hoist now.

Hoisting wire rope and hoist chains for sale

Hoisting wire rope and hoist chains for sale from supplier

Hoisting wire rope and hoist chains are the important part of the hoist which are closely bound up with the safe work load, now let’s talk about the formula or rule of thumb to calculate the SWL of ropes and hoist chains.
Basic:
All diameters are measured in millimeters (mm).
All weight are calculated in Kilograms(kg).
Formula SWL-Fiber Rope
Diameter in mm squared=The weight in kg.
(Diameter)²=SWL Kg
Example: For a 12mm diameter rope…..
SWL=12*12=144Kg
Formula Size-Fiber Rope
Choosing the correct rope for the load
Fiber Rope Square root of weight
Example:900Kg load
Rope diameter=√90=30mm
Hoisting wire rope Construction
6*19 (6 strands*19 wires)
6*24 (6 strands*24 wires)
6*37 (6 strands*37 wires)
Electric hoisting wire rope drawing
Electric hoisting wire rope drawing
Formula SWL-Steel Hoisting wire rope
SWL=8D²
8 times stronger than Fiber
(Diameter)²*8=SWL Kg
Example: For a steel Hoisting wire rope of 15mm diameter
SWL=15*15*8=1800Kg
Formula Size-Steel Hoisting wire rope
Square root of the load divide by 8
Example:5000kg load
Ø=√5000÷8
=√625
The diameter of steel Hoisting wire rope=25mm
SWL=8D²
Steel Hoisting wire rope discarding factor
10% of the wires broken in a length of eight times the diameter
Example:6*19 construction 20mm Diameter
6*19=114 wires
10% of 114 wires=11
8*20mm=160mm
11 wires broken over a length of 160mm discard sling
Electric hoisting wire rope drawing
Electric hoisting wire rope drawing
Formula SWL-Hoist chains grade 30
Nine times stronger than Fibre
(Diameter)²*9=SWL (Kg)
Contoh: Garispusat=18mm
SWL=18*18*9
=2916Kg
SWL=9D²
Formula SWL-Rantai Gred Peblagai
Grade 30 hoist chains=9 times stronger than fiber rope
Grade 40 hoist chains=12 times stronger than fiber rope
Grade 60 hoist chains=18 times stronger than fiber rope
Grade 80 hoist chains=24 times stronger than fiber rope
Formula for different grades
0.3*diameter²MM*Grade of Hoist chains
Or SWL=0.3*D²*Grade
Formula Size-Hoist chains of different grade
Square root of the weight (Kg) divide by the grade of China
Example: Weight=5400Kg & Grade=40
Diameter of Hoist chains=√Weight÷(0.3*Grade)
=√5400÷(0.3*40)
=21.2 mm
W=12D²

Load factor 2 slings at an angle
Sling angle 30° 60° 90°
Load factor 1.93 1.73 1.41
Comparative Methods of Wire Rope Slinging
Wire rope slings

Full Wrap

Hoisting wire rope safe working load drawing

Hoisting wire rope safe working load drawing
Different types of Hoisting wire rope hoists and chain hoist
FEM wire rope hoist

FEM wire rope hoist

Electric wire rope hoist

Electric wire rope hoist 

Electric chain hoists for sale

Electric chain hoists for sale

electric-chain-hoist.jpg

Fixed type electric chain hoist for sale – 20 ton chain hoist project

Electric hoist safety tips on how to calculate the safety working load of you hoisting wire rope and hoist chains. Dongqi Hoist and Crane offers types of electric hoists, hoisting wire ropes and hoist chains to meet all you needs. Contact us to get your ideal hoisting wire rope and hoist chains,  electric hoist, and types of cranes now.

Safe work load calculation of hoisting wire rope and hoist chains

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taitai 3 months 0 Answers 26 views 0

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