Home > Media & Resource > Blog

Electric Hoist safety: Safe work load calculation of hoisting wire rope and hoist chains

16 Jun, 2017

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 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.ObbHenan Dongqi Machinery Co., Ltd

Hoisting wire rope and hoist chains for saleObbHenan Dongqi Machinery Co., Ltd

Hoisting wire rope and hoist chains for sale from supplierObbHenan Dongqi Machinery Co., Ltd

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.ObbHenan Dongqi Machinery Co., Ltd

Basic:

All diameters are measured in millimeters (mm).ObbHenan Dongqi Machinery Co., Ltd
All weight are calculated in Kilograms(kg).ObbHenan Dongqi Machinery Co., Ltd

Formula SWL-Fiber Rope

Diameter in mm squared=The weight in kg.ObbHenan Dongqi Machinery Co., Ltd
(Diameter)²=SWL KgObbHenan Dongqi Machinery Co., Ltd
Example: For a 12mm diameter rope.....ObbHenan Dongqi Machinery Co., Ltd
SWL=12*12=144KgObbHenan Dongqi Machinery Co., Ltd

Formula Size-Fiber Rope

Choosing the correct rope for the loadObbHenan Dongqi Machinery Co., Ltd
Fiber Rope Square root of weightObbHenan Dongqi Machinery Co., Ltd
Example:900Kg loadObbHenan Dongqi Machinery Co., Ltd
Rope diameter=√90=30mmObbHenan Dongqi Machinery Co., Ltd

Hoisting wire rope Construction

6*19 (6 strands*19 wires)ObbHenan Dongqi Machinery Co., Ltd
6*24 (6 strands*24 wires)ObbHenan Dongqi Machinery Co., Ltd
6*37 (6 strands*37 wires)ObbHenan Dongqi Machinery Co., Ltd

Electric hoisting wire rope drawing

Electric hoisting wire rope drawingObbHenan Dongqi Machinery Co., Ltd

Formula SWL-Steel Hoisting wire rope

SWL=8D²ObbHenan Dongqi Machinery Co., Ltd
8 times stronger than FiberObbHenan Dongqi Machinery Co., Ltd
(Diameter)²*8=SWL KgObbHenan Dongqi Machinery Co., Ltd
Example: For a steel Hoisting wire rope of 15mm diameterObbHenan Dongqi Machinery Co., Ltd
SWL=15*15*8=1800KgObbHenan Dongqi Machinery Co., Ltd

Formula Size-Steel Hoisting wire rope

Square root of the load divide by 8ObbHenan Dongqi Machinery Co., Ltd
Example:5000kg loadObbHenan Dongqi Machinery Co., Ltd
Ø=√5000÷8ObbHenan Dongqi Machinery Co., Ltd
=√625ObbHenan Dongqi Machinery Co., Ltd
The diameter of steel Hoisting wire rope=25mmObbHenan Dongqi Machinery Co., Ltd
SWL=8D²ObbHenan Dongqi Machinery Co., Ltd

Steel Hoisting wire rope discarding factor

10% of the wires broken in a length of eight times the diameterObbHenan Dongqi Machinery Co., Ltd
Example:6*19 construction 20mm DiameterObbHenan Dongqi Machinery Co., Ltd
6*19=114 wiresObbHenan Dongqi Machinery Co., Ltd
10% of 114 wires=11ObbHenan Dongqi Machinery Co., Ltd
8*20mm=160mmObbHenan Dongqi Machinery Co., Ltd
11 wires broken over a length of 160mm discard slingObbHenan Dongqi Machinery Co., Ltd

Electric hoisting wire rope drawing

Electric hoisting wire rope drawingObbHenan Dongqi Machinery Co., Ltd

Formula SWL-Hoist chains grade 30

Nine times stronger than FibreObbHenan Dongqi Machinery Co., Ltd
(Diameter)²*9=SWL (Kg)ObbHenan Dongqi Machinery Co., Ltd
Contoh: Garispusat=18mmObbHenan Dongqi Machinery Co., Ltd
SWL=18*18*9ObbHenan Dongqi Machinery Co., Ltd
=2916KgObbHenan Dongqi Machinery Co., Ltd
SWL=9D²ObbHenan Dongqi Machinery Co., Ltd

Formula SWL-Rantai Gred Peblagai

Grade 30 hoist chains=9 times stronger than fiber ropeObbHenan Dongqi Machinery Co., Ltd
Grade 40 hoist chains=12 times stronger than fiber ropeObbHenan Dongqi Machinery Co., Ltd
Grade 60 hoist chains=18 times stronger than fiber ropeObbHenan Dongqi Machinery Co., Ltd
Grade 80 hoist chains=24 times stronger than fiber ropeObbHenan Dongqi Machinery Co., Ltd

Formula for different grades

0.3*diameter²MM*Grade of Hoist chainsObbHenan Dongqi Machinery Co., Ltd
Or SWL=0.3*D²*GradeObbHenan Dongqi Machinery Co., Ltd

Formula Size-Hoist chains of different grade

Square root of the weight (Kg) divide by the grade of ChinaObbHenan Dongqi Machinery Co., Ltd
Example: Weight=5400Kg & Grade=40ObbHenan Dongqi Machinery Co., Ltd
Diameter of Hoist chains=√Weight÷(0.3*Grade)ObbHenan Dongqi Machinery Co., Ltd
=√5400÷(0.3*40)ObbHenan Dongqi Machinery Co., Ltd
=21.2 mmObbHenan Dongqi Machinery Co., Ltd
W=12D²ObbHenan Dongqi Machinery Co., Ltd

Load factor 2 slings at an angleObbHenan Dongqi Machinery Co., Ltd
Sling angle 30° 60° 90°ObbHenan Dongqi Machinery Co., Ltd
Load factor 1.93 1.73 1.41ObbHenan Dongqi Machinery Co., Ltd

Comparative Methods of Wire Rope Slinging

Wire rope slingsObbHenan Dongqi Machinery Co., Ltd

Full WrapObbHenan Dongqi Machinery Co., Ltd

Hoisting wire rope safe working load drawingObbHenan Dongqi Machinery Co., Ltd

Hoisting wire rope safe working load drawingObbHenan Dongqi Machinery Co., Ltd

Different types of Hoisting wire rope hoists and chain hoist 

FEM wire rope hoistObbHenan Dongqi Machinery Co., Ltd

FEM wire rope hoistObbHenan Dongqi Machinery Co., Ltd

Electric wire rope hoistObbHenan Dongqi Machinery Co., Ltd

Electric wire rope hoist ObbHenan Dongqi Machinery Co., Ltd

Electric chain hoists for saleObbHenan Dongqi Machinery Co., Ltd

Electric chain hoists for saleObbHenan Dongqi Machinery Co., Ltd

electric-chain-hoist.jpgObbHenan Dongqi Machinery Co., Ltd

Fixed type electric chain hoist for sale - 20 ton chain hoist projectObbHenan Dongqi Machinery Co., Ltd

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.ObbHenan Dongqi Machinery Co., Ltd

DQCRANE PRODUCTS