Sunday, November 1, 2009

Komatsu PC5500 Slip Off Float


These are another set of photos sent in by a reader. These are from the Griffin coal mine in Western Australia.


It looks here like the float has slipped backwards down the wet ramp.

Those chains are looking a bit small for the job.

You can see here that the tracks were muddy before being loaded onto the float. This would have decreased the friction between the excavator and the float.





Yeah, those chains are far too light for the purpose of restraining a 500t load. The only thing holding the excavator to the float was the surface friction of two metal plates with a bit of water and mud in between.

A lot of equipment doesn't get secured onto floats (probably because it would take a crane to lift sufficiently strong chains into place), but if you're going to do a job...


The Komatsu website lists the weight of the PC5500 as 525t, 'including operator'.

Hmm, no flag, beacon or even reflective markings on the light vehicle in the background.

4 comments:

Anonymous said...

The people in charge of this move were told that stronger chains were required and a rubber matt to increase surface friction between the shovel and float But as usual disregarded the advice.also the float was heading straight down a ramp at a minimum of a 1/10 grade, the big boxes you can see are the motors that drive the hydraulics of the remote controll float that is supposed to be used on flat surfaces.

Anonymous said...

Yep the bosses should have been given the AXE ?

Anonymous said...

The driver/operator was probably fired and the boss's given promotions and pay raises. Remember, 'crap' flows downhill.

Anonymous said...

Basically it seems that everyone has there own opinions about what is right and wrong but any chains made to hold the shovel on this float would have torn the float into pieces. There are several reasons why this happened!
The move was conducted in the wet.
Steel on steel is never a good idea for floats
The float was not fit for the environment it was working in.
The operators were not experienced enough.
The risk management process was not followed by all levels of the management team.
The drive system on the float was more than adequate to operate on 1:10 angles.
As you can see in the photo's the float has broken the road surface and the spotter at the back has made the call to stop the float and the operator has done just that, however the shovel didn't hear that instruction and kept going. The float wasn't that damaged considering what happened. No one was hurt, all good

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