Lifting attachment design factors

In summary, the conversation was about determining the allowable stress in a lifting attachment made of mild steel. The individual had multiplied the load by 1.3 for a dynamic load factor and was trying to determine the required factor of safety (FOS). They had looked through various standards, with BS2573 seeming the simplest to follow. However, there was some uncertainty about whether it was applicable to lifting attachments as it mainly focused on cranes. The expert suggested using a yield factor of safety of 3.0 and an ultimate factor of safety of 5.0 for lifting attachment hardware.
  • #1
leon25034796
6
0
I'm looking for some advice:
I am trying to determine the allowable stress in a lifting attachment we have had manufactured. The lifting attachment is a mild steel block that bolts to the component to be lifted with a lug to enable a shackle to be fitted; two of these blocks are then fitted to the component at either end and the component is then lifted by crane.
When calculating the stresses in the component I have multiplied the load by 1.3 for a dynamic load factor. What I am trying to determine is the allowable stress i.e. FOS required. I have had a scan through BS2573, BS5950, BS449.
BS2573 seems the simplest to follow and I believe BS5950 is a plastic code where I am interested in elastic. However is BS2573 applicable to lifting attachments as it seems predominantly concerned with cranes?
 
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  • #2
leon25034796: I am not familiar with those cited standards, but I seem to recall that, for lifting attachment hardware, you typically use a yield factor of safety of 3.0, and an ultimate factor of safety of 5.0.
 

1. What is the purpose of a lifting attachment?

A lifting attachment is a device or mechanism used to securely attach an object to a lifting device, such as a crane or forklift. It is designed to ensure that the object is lifted safely and efficiently, without causing damage to the object or endangering the operator.

2. What are the most important factors to consider when designing a lifting attachment?

The most important factors to consider when designing a lifting attachment include the weight and dimensions of the object being lifted, the type and capacity of the lifting device, the environment in which the attachment will be used, and the materials and construction of the attachment itself. Safety, strength, and stability should also be top priorities in the design process.

3. How do I determine the appropriate capacity for a lifting attachment?

The capacity of a lifting attachment should be determined by the weight of the object being lifted, taking into account any potential additional loads or stress factors. It is important to choose an attachment with a capacity that exceeds the weight of the object, to allow for any unexpected changes or variations in weight.

4. What materials are commonly used in lifting attachment design?

The materials used in lifting attachment design can vary depending on the specific application, but some common options include steel, aluminum, and synthetic materials such as nylon or polyester. The choice of material should be based on factors such as strength, durability, and resistance to corrosion or other environmental factors.

5. How can I ensure the safety of a lifting attachment?

To ensure the safety of a lifting attachment, it is important to carefully consider all design factors, use high-quality materials and construction methods, regularly inspect and maintain the attachment, and follow all manufacturer's instructions and safety guidelines. It is also essential to properly train and certify all operators who will be using the attachment.

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