Flemished eyes are preferred in professional rigging shops because they have inherent reserve capacity, even if there's an issue with the swage fitting. The same cannot be said for turnback/duplex sleeves. Not sure what we're talking about? Watch this video where we test a Flemished sling with unpressed eyes, and you'll understand.
PLEASE NOTE: We would never provide our customers with unpressed slings, and you should NEVER rig with them. This test is for demonstration purposes only.
Even unpressed, with no swage sleeve, the eye will withstand a surprisingly high load. Let's find out what happens...
As we applied tension, the strands started to choke on themselves and bound tighter and tighter until they reached a point of failure and pulled out of the splice. This is as expected. (Also, the large D/d ratio in this test yielded a good result — we wrapped the eyes directly around the main test bed pins, which are appx. 4" in diameter). With a 5:1 safety factor, properly swaged, this sling "should" fail at 25,000 lbs. So, when we achieved 85% of the expected breaking strength in this test (21,300 lbs.), we demonstrated that the Flemished eye has its own reserve capacity apart from the swage sleeve. (To reiterate: this is only a test, NEVER rig with a sling that is unpressed.)
This demonstrates why you should always use Flemished sleeves if possible. Rigging with turnback sleeves can be done safely, but again, with no actual splice taking place, they are not as safe as Flemished sleeves.
Please always inspect your slings before use and adhere to industry standards and best practices. Thanks for staying safe out there!
#BreakTest #WireRope #TrusttheLift