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Duplex coatings
Duplex coating of the Ndlovu Roll Over
Protection Structure (ROPS) and the
Falling Object Protection Structure (FOPS)
The Roll Over Protection Structures
(ROPS) and the Falling Object
Protection Structures (FOPS) was
developed, design registered and
patented by Marven Equipment in
Benoni Gauteng.
Marven Equipment, being a family
owned business founded by Wayne and
Christine Geldart, is a dynamic
company that is constantly evolving
with the times, and trying to
accommodate the needs of their clients
regarding mining vehicle products and
accessory requirements.
Marven’s ROPS was branded ‘Ndlovu’
after the African elephant, strong,
robust, and the lightest in its class of
being a heavy duty, multiple roll over
protection structure. Ndlovu is
capable of handling speeds of
120km/h thus enabling additional
protection for contractors and
employees from the moment they
leave their homes and families, on
the mines, and back home safely
again.
Ndlovu is designed to offer
additional protection for the
occupants inside the cab of a vehicle
in the event of a roll over accident.
Ndlovu ROPS is capable of handling
4-6 times a vehicle’s Gross Mass
Weight. These structures were not
originally duplex coated, but when
Anglo Sishen asked Marven
Equipment to hot dip galvanize the
Ndlovu structures to help prevent the
rapid corrosion rate in the highly
corrosive mining environments, they
began their investigations.
With the assistance of the Hot Dip
Galvanizers Association of Southern
Africa and Bulldog Projects (Pty) Ltd,
a specification was put in place for
the hot dip galvanizing and duplex
coating system offering a 7 year
warranty against rust and corrosion.
The standard vent, fill and drainage
holes required for tubular structures
Finite Element Testing (FEA) was verified using physical tests including deliberately destroying a vehicle in a multiple roll.
16 Hot Dip Galvanizing Today Volume 9 Issue 2 2012