0027/nd guidelines for Marine Lifting and Lowering Operations

GUIDELINES
 
FOR
 
MARINE
 
LIFTING
 
&
 
LOWERING
 
OPERATIONS 
0027/ND Rev 11 
 
Page 16 of 84 
Term or Acronym 
Definition 
Spreader bar (frame) A spreader bar or frame is a structure designed to resist the compression 
forces induced by angled slings, by altering the line of action of the force on 
a lift point into a vertical plane. The structure shall also resist bending 
moments due to geometry and tolerances. 
Structure 
The object to be lifted 
Submerged Weight 
Gross Weight of the Structure minus the weight of displaced water. 
Survey 
Attendance and inspection by a GL Noble Denton Representative. 
Other surveys which may be required for a marine operation, including 
suitability, dimensional, structural, navigational and, Class surveys.
Surveyor 
The GL Noble Denton representative carrying out a survey,
An employee of a contractor or Classification Society performing, for 
instance, a suitability, dimensional, structural, navigational or Class survey.
SWL / 
Safe Working Load
SWL is a derated value of WLL, following an assessment by a competent 
person of the maximum static load the item can sustain under the 
conditions in which the item is being used. 
Termination factor 

s
A partial safety factor that accounts for the reduction in strength caused by 
a splice or mechanical termination.
TMS 
Tether Management System 
Tonnes 
Metric tonnes of 1,000 kg (approximately 2,204.6 lbs) are used throughout 
this document. The necessary conversions must be made for equipment 
rated in long tons (2,240 lbs, approximately 1,016 kg) or short tons (2,000 
lbs, approximately 907 kg). 
Trunnion 
A lift point consisting of a horizontal tubular cantilever, round which a sling 
or grommet may be passed. An upending trunnion is used to rotate a 
structure from horizontal to vertical, or vice versa, and the trunnion forms a 
bearing round which the sling, grommet or another structure will rotate. 
Twist Factor, 

tw
A partial safety factor used in the design of fibre slings and grommets used 
for lifting operations to account for the risk of the fibre sling or grommet 
twisting under load. 
ULC / 
Ultimate Load 
Capacity
Ultimate load capacity of a wire sling, grommet, chain, shackle or similar is 
the certified minimum breaking load. The ULC of slings and grommets 
allows for good quality splices. 
Ultimate load capacity of a padeye, clench plate, delta plate or similar 
structure, is defined as the load which will cause general failure of the 
structure or its connection into the barge or other structure. 
USBL 
Ultra Short Baseline Array 
UT / 
Ultrasonic Testing 
Detection of flaws or measurement of thickness by the use of ultrasonic 
pulse-waves through steel or some other materials. 
Vessel 
A marine craft designed for the purpose of transportation by sea or 
construction activities offshore. See Barge 
Wear Factor, 

w
A factor used in the design of slings and grommets used for lifting 
operations to account for physical condition of the sling or grommet. 
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