The LiftPro Patient Sling

Margin of Safety

 

Every patient lifting sling has a margin of safety that allows for extra safety in case a patient exceeds the stated maximum weight on the lift. A margin of safety is a measure of how many times the stated maximum stress a part can take before failing. It is calculated using the formula below:

 

Margin of Safety =  (Failure Load)/(Design Load) - 1

 

Using this equation, we calculated the margin of safety of each of the three parts of the LiftPro Patient Sling.

 

Sling Body

Failure load ~ 10^6 Pa

Design load ~ 10^3 Pa

 

 

Margin of Safety = (10^6/10^3 )-1

 

Margin of Safety ~ 10^3

 

Straps

Failure load = 5560 N

Design load = 513.8 N

 

Margin of Safety=  (5560/3082.86)-1

 

Margin of Safety=10.82

 

Attachment Points

Failure load = 88 MPa

Design load = 15 MPa

 

Margin of Safety = (88/15)-1

 

Margin of Safety = 4.86

 

As demonstrated by each of the margins of safety, the LiftPro Patient Sling is very safe.