2 Reasons for Design Factors in Rigging Equipment

“The Pro Rigger” by Mike Parnell

As you know in ASME B30.9 SLINGS and other industry documents that highlight sling capacities, there are stated design factors. Also in B30.26 RIGGING HARDWARE which covers shackles, swivel hoist rings, eye bolts, rigging blocks and the like lists design factors between 4 and 5.

The first primary reason is to account for some measurable amount of wear to the sling or component during its lifespan. This wear will reduce its overall minimum breaking force (ultimate strength). This may occur in the form of metal loss in links of a chain sling or in the bow or pin of a shackle. The respective manufacturers have pre-calculated the amount of loss they can live with before calling for the equipment’s removal from service.  Read more…

Get the free newsletter

Sign up for news, trends and equipment for sale in the lifting and rigging industry.
By signing up you agree to our Terms of Use and Privacy Policy. You may unsubscribe at any time.

Latest Products For Sale

Type Description
Equipment National Brand - Used 5x7 and 6x12 Dies - All dies meet specifications - Various…
Equipment 100 Feet of Steel Framing • Last four sections of pre-owned 1.3 mil test bed…
Equipment 300K – 62 ft. PTM SATEC • Hydraulic guards • 62’ overall length • 6’…
Equipment 100K x 40 ft. Single Range, 7.5HP Manual Control Texmate Readout, 2’ Stroke – Tube…
Equipment Refurbished 500K Lucker Wire Rope Grip • Manual Operated • Front Face Mount • 500,000…

News & Articles