The length of a sling can be determined in multiple ways. Understanding the differences is key in quality assurance and thermology must be used strict to prevent form miscommunications.
Circumference length (CL)
This is the length of the roundslings inner circumference and is independent from the geometries of the hardware (hooks, shackles, trunnions) used and independent from the sling diameter. The correct CL is measured at 3% MBL
Effective Working length. (EWL)
This is the distance between bearing surface and bearing surface of the hardware. In order to calculate from EWL to circumferential Length, the shape of the hardware has to be known. In case no hardware diameter is indicated, the minimal bending diameter is used as reference value. The correct EWL is measured at 3% MBL
Flat laying length. (FLL)
Is determined as half of the circumferential length. The correct FLL is measured at 3% MBL
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