GUIDELINES
FOR
MARINE
LIFTING
&
LOWERING
OPERATIONS
0027/ND Rev 11
Page 15 of 84
Term or Acronym
Definition
Operational
reference period
The Operation Duration, plus the
contingency period
Padear
A lift point consisting of a central member, which may be of tubular or flat
plate form, with horizontal trunnions round which a sling or grommet may
be passed
Padeye
A lift point consisting essentially of a plate, reinforced
by cheek plates if
necessary, with a hole through which a shackle may be connected
PLEM
Pipe Line End Manifold
PLET
Pipe Line End Termination
PNR /
Point of No Return
The last point in time, or a geographical point
along a route, at which an
operation could be aborted and returned to a safe condition
RAO
Response Amplitude Operator
Reduction Factor,
r
The Reduction Factor used in the design of slings or grommets
representing the largest values of
b
and
s
.
Rigging
The slings, shackles and other devices including spreaders used to
connect the structure to be lifted to the crane
Rigging
Weight
The total weight of rigging, including slings, shackles and spreaders,
including contingency.
Rope
The unit rope from which a cable laid sling or grommet may be constructed,
made from either 6 or 8 strands around a steel core, as indicated in ISO
Refs. [9] & [10] and IMCA, Ref. [7].
ROV
Remote Operated Vehicle
Seafastenings
The means of restraining movement of the loaded structure on or within the
barge or vessel
SHL /
Static Hook Load
The Hook Load is the Gross Weight or NTE weight
plus the rigging weight
Single Laid Sling
A cable made up of 6 ropes laid up over a core rope, as shown in ISO,
Ref. [9] and [10], with terminations each end.
SKL /
Skew Load Factor
A factor to account for additional loading caused by rigging fabrication
tolerances, fabrication tolerances of the lifted structure and other
uncertainties with respect to asymmetry and associated
force distribution in
the rigging arrangement.
Slamming loads
Transient loads on the structure due to wave impact when lifting through
the splash zone.
Sling eye
A loop at each end of a sling, either formed by a splice or mechanical
termination
Splice
That length of sling where the rope is connected back into itself by tucking
the tails of the unit ropes back through
the main body of the rope, after
forming the sling eye
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