For strapping and holding any weight at all you need many points of hold. I design Load and cargo securing anchors and channels specifically for the Steel and heavy haulage industry here in the UK, along with the Mira Institute and the Steel Producers we now have a fool proof system for holding 25Tonne coils of steel/lumps of steel plate or blooms.
Each Drop forged Anchor is designed to a swl of 5000kilo per anchor point, these would be attached to Polyesther Lashings with a equalled strength Ratchet, all these items have been tested to destruction and will hold up to 9500kilos as individual items, so take an example of one Coil of Steel weight 25000kilo, this would be held by a minimum of ten Forged anchors that equates to a SWL of 50000Kilo, with a known destruction point under shock loading of 95000kilos.
However it all rests on the strength of the foundation of what you are anchoring to, each Anchorage needs a separate Foundation anchorage, otherwise you will loose your load should any sort of incident occur!
Road transport shun chains for you cannot tighten them, you can impose pressure on them but once a chain link meets its oposite chain link thats the end of the tightening proceedure with links, polyester and or Nylon Straps/lashings are far more able to handle any movements due to the way these items of lashings are manufactured. provided the operator follows the manufactures instructions.
Exactly the same will be true in any bulk cargo carried in ANY aircraft.
Last edited by Peter-RB; 16th Jun 2013 at 13:23.