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STINGRAY
Dynamic Load Monitoring has
launched a new Acoustic
Positioning Grapnel called
Stingray.
It is positioned at the rear of a
train of multiple grapnels and
towed behind the vessel when a
pre-lay grapnel run (PLGR) is
being undertaken. It is located
the furthest away from the ship’s
stern.
It uses acoustics to send a signal
to a vessel towing the train to
communicate where it is on the
seabed.
Stingray is 1343mm long and
308mm high with the beacon
closed; with it open, it is 473mm
high. The main body is 500mm
wide and, depending on what
type of stabiliser is fitted, it is
900mm or 1500mm wide.
While there is only one body size,
there will be options in that
customers will be able to fit
different sized stabilisers to suit
deployment chutes. There will also
be the ability to fit different
manufacturers’ ultra-short baseline
(USBL) beacons to meet the
client’s preferences and what
receiver is already fitted onto the
vessel.
The acoustic grapnel is
manufactured from high-strength
structural steel and covered with a
special marine paint.
Martin Halford, managing director
at DLM, said: “The overall shape
of it is based on the front skid of
our wheeled detrenching
grapnel.
“As a grapnel train is being
towed it is often just assumed
that the train falls in line with the
direction and movement of the
vessel and follows the same path.
However, this is not necessarily
the case due to the length of the
tow line and also the length of
the train; the whole assembly can
wander and in some cases the
grapnel train could be outside of
the planned route.”
ACOUSTIC CORER:
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