30 st / March 2017 www.sea-technology.com
ameter without requirement of determining winch controls,
investigating legacy PLC code or noisy antiquated integral
rotational and force sensors. Rugged Controls provides cali-
bration certs for each RLT, which can be paired with its •ag-
ship product, the LCI-90i Rugged Controller.
In dredging applications, anchor, pump and cutter posi-
tion and tension measurements are critical to ensure ma-
chine reliability and ef•ciency, in addition to exact vessel
position. With these data, not only are the operators able
to determine the machine position in relation to the seabed,
they are able to use tension data to prevent snags and caught
loads. Left unmonitored, such events can snap a winch line,
cause vessel and/or equipment damage, and lead to signi•-
cant down time, delays and repair costs.
In addition to monitoring software, Rugged Controls sys-
tems are networked into vessel and dredging software. This
allows for advanced control algorithms, alarms and alerts
that are used to automate and improve the dredging pro-
cess, and to notify rig staff when tension or payout reaches
an unsafe condition.
Rugged Controls RLT frames are made with alloy steel
with a marine grade coating. The sheaves are made of 4340
alloy steel, and the pins and shafts are 316 SS. Spherical
roller bearings with external seals provide for a longer-last-
ing approach than bushings.
In dredging, tension accuracy and payout accuracy are
critical. Rugged Controls dredging systems use the RL-10-
SSP Encoder option, which provides better than 1-mm pay-
out accuracy. Tension accuracy is rated at better than 1 per-
cent, and for this project was better than 0.5 percent. These
metrics far exceed industry average.
The original Removable Center Sheave RLT design allows
operators to quickly install and remove a tensiometer from
a •xed line. For RLTs that will stay in place for long periods
of time, the Single Side Plate version provides the same ac-
curacy and durability at a lower total cost of ownership.
For a list of references, contact Kyle McKinney at kylem@
Kyle McKinney began his career in instrumenta-
tion in 2007. He is an industry recognized expert in
overhead weighing systems, line control and other
extreme applications. As vice president of sales and
marketing at Rugged Controls, he and his team pro-
vide the highest quality smart deck machinery, sen-
sors and rugged programmable controllers.
Jan Lefever was educated at the University of Leuven,
and his career with DEME Group began in 1980. He
now serves as the manager of the automation techni-
cal department, where he oversees a variety of instru-
mentation, automation and projects for the dredging
and construction company.
Tom Rezanka has a B.S. in physics and joined Mea-
surement Technology NW in 1993. He is now presi-
dent of Rugged Controls. His extensive knowledge of
monitoring systems includes high-accuracy sensors
and interfaces, software design, hardware design,
microwire harness design, and distributed communi-
cations. He has extensive experience in winch appli-
cations for monitoring, control and data acquisition.