LAWSON ENGINEERS LTD Ref : PJ1682
Issue Date : 06.06.2006
bearing is the rotating frame. The rotating frame realigns the vehicle assembly to permit
recovery through the legs of the A-frame.
Mounted to the rotating frame is the docking box. This safely captures the vehicle
system, removing lift forces from the umbilical cable, by means of two mechanical
latches that are sprung on and hydraulically released. Also mounted to the rotating frame
is the sprung frame that cushions the vehicle during latching operations.
There is a facility to pass the umbilical assembly over the sheave and through the snubber
assembly without major disassembly. The removable flare pieces must be unbolted from
the sheave and the plastic umbilical guides must be removed from the docking box. The
docking box is sized to pass the umbilical termination without any further disassembly.
There is also an overload protection facility. This is controlled by a loadcell that supports
the sheave. Once the tension in the umbilical rises above the set point an alarm sounds
and further movement of the A frame outboard is impossible.
Rotational
movement
200
degrees.
Vertical
movement
600mm
Transverse
movement
+/-
20
degrees
CAUTION –
The 20 degrees sideways motion is
only limited by proximity switches. If
these fail the structure will be damaged as
the cylinders over extend. Check the
function of the proximity switches
regularly and keep a good visual check if
operating close to the limit of the swing.
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