African Mining Brief - March /April 2019

Page 20

Roof-mounted Roll Over Protection Systems (ROPS) for Mining Vehicles

Assessing ROPS reliability and suitability No stone should be left unturned in verifying the reliability of ROPS that are to be installed on mining vehicles. Key aspects and all scenarios have to be thoroughly analysed.


n matters relating to safety in the mining environment, negligence can be the big difference between saving lives and disaster. In mining vehicles, in particular, the consequences of failure to plan and manage the risk of roll-over accidents can be very catastrophic. The biggest - if not the most common - oversight relates to the choice of the quality of Roll Over Protection Systems (ROPS). What compounds the problem for mining companies are the thousands of ROPS out there whose veracity, particularly in performance levels, cannot be easily established. In such a cluttered ROPS market, how can mine distinguish the proverbial wheat from chaff? The correct procedure Dr Shane Richardson, an expert in ROPS engineering from Delta-V Experts South Africa, responds to this question. Dr Richardson is veteran in ROPS, with a PHD PhD in ROPS to boot. Together with co-director of Delta-V Experts SA, Steve Croker, he has been evaluating ROPS from 2005. Previously, from 1996, Dr Richardsonhe had been working on ROPS for the Australian Department of Defence. Dr Richardson states that following the is a correct procedure can ensure that reliable and suitable ROPS products are chosen, mitigating the risk of occupant injury in a roll-over accidentscrash.

presented work, Development of Rollover Protective Structures for Mining Light Vehicles, published in 2009. Vital points The vital points from Delta-V Experts’ peerreviewed work are that:

1. Key questions Dr Richardson says the first three questions that a mining organisation should ask itself during the procurement process of ROPS systems are: • What is testing and engineering basis of the people who are going to be selling the ROPS? • What is the design requirement of the ROPS for a SUV, bakkie/ute/pickup and for different types of trucks? • Has the organisation selling the ROPS presented a paper and/or papers which have been accepted, peer reviewed and published? (In other words, are they prepared to put their knowledge out there?) In Delta-V Experts’ opinion, effective SUV’s and bakkie/utes/pickups ROPS should be capable of supporting 4 to 6 times the vehicle mass without structural compromise of the ROPS, whilst protecting the vehicle cabin occupant space from gross deformation (crush). This point is cited Delta-V’s published, peer reviewed and


GEOMETRIC REQUIREMENT: The structure must provide geometric protection of the occupant space. QUASI-STATIC STRENGTH REQUIREMENT: The structure must maintain a minimum of 4 times the vehicle mass at 100mm deformation, desirably increasing progressively up to 6 times the vehicle mass, up to a deformation of 300mm in a quasi-static loading environment. The load should be applied using a platen consecutively to both sides of the vehicle at various angles similar to the platen (30” x72”), roll angle (25°) and pitch angle (5°) used in FMVSS 216. A loading matrix should be applied, which considers multiple load directions, e.g. loads of between four to six times the vehicle mass applied to the ROPS in at least nine different orientations such as: three varying roll angles (20°, 30° and 40°) and three varying pitch angles (5°, 10° and 15°).

Read More of this on:

External Roll Over Protection Suv’s Duel Cab Idv’s Single Cab Idv’s |


March - April 2019