Risk Management for Rigging from ProSoundWeb

Andrew Martin, the originator of ATM Flyware, wrote a good guide for managing your show rigging assets in the March 28, 2013 edition of ProSoundWeb.  The article provides a short overview of Risk Management Guidelines and provides a series of example graphics to show you specific points of concern to watch-out for.

Example of SpanSet / Round Sling Inspection Points

The article can be found here:  www.prosoundweb.com/article/hanging_out_risk_management_for_rigging

Wire rope cable termination gone wrong - very wrong

(Sigh) What can I say that this picture doesn't? Obviously, the proper way to terminate a wire rope was not in this person's skill set. Good intentions mean little if someone gets injured due to a rigging failure.

• Know your load.
• Know your cable strength.
• Know how to apply a safety (design) factor for live loads vs static loads.
• Know the efficiency (derating) of the termination method (Crosby's are different than Nicopress).
• Know how to install a cable thimble.
• Know how to terminate it for maximum safe load carrying capacity.

If you use cable clips ("Crosby's"):

• Know how to install them ("Never saddle a dead horse" means don't install the forged cable grip over the unloaded tail of the cable).
• Know how many you need.
• Know the spacing required.
• Know the torque of the bolts/nuts and use a torque wrench to achieve it.

If you use crimp-on sleeves ("Nicopress"):

• Know how to install them.
• Know how many you need.
• Know the spacing required.
• Know which axis of the compression oval is to be crushed (crimped).
• Know how to check and adjust the crimping tool so the die properly siezes the compression oval.
• Use a Go / No-Go gauge to check your finished crimps.

{Photo courtesy of 'Curiousbrandt' on Flicker}