Every sling is proof loaded before release, and every test leaves a record: the load, the length, the curve between them.
Test bed
A horizontal bed long enough to test the slings at their working length, in the hitch they will be used in — straight pull or basket over pins sized to the job.
Length is logged in steps all the way up the load, so the certificate carries a curve, not a single number at the end of the test.
Sequence
The same five steps for every sling, whatever its size.
Each HMPE yarn batch is tensile tested before it goes into a core. The report numbers follow the sling to its certificate.
Length is measured at 3% MBL on test pins of known diameter, and checked against tolerance.
Proof loaded in the hitch it will be used in, to the standard the project calls for, with load and length logged all the way up.
Every sling is fully inspected before release.
Working length is recalculated for the real hook and trunnion. Certificate, curve and yarn reports go into the data book, with witness by DNV, ABS, LR, BV or RINA upon request.
Cyclic, elongation and break testing where the project requires it.
The record
One book per order, built as the slings are tested. It is the document the lifting contractor's engineers and the warranty surveyor will ask for.
Tell us the lift and the standard. We'll set the test to match.