0027/nd guidelines for Marine Lifting and Lowering Operations

16.5 
CLEARANCES AROUND MOORING LINES AND ANCHORS
16.5.1 
The required clearances around mooring lines and anchors are given in Section 11 of 0032/ND
“Guidelines for Moorings”, Ref. [6] . 
16.5.2 
Clearances should take into account the possible working and stand-off positions of the crane vessel. 
16.5.3 
During lifting operations, crossed mooring situations should be avoided wherever practical. Where 
crossed moorings cannot be avoided, the separation between active catenaries should be no less than 
the requirements given in Section 11.5 of 0032/ND “Guidelines for Moorings”, Ref. [6]. 
16.5.4 
If any of the clearances specified above are impractical because of the mooring configuration or 
seabed layout, a risk assessment shall be carried out and special precautions taken as necessary. 
16.6 
CLEARANCES FOR FABRICATION YARD LIFTS 
16.6.1 
Additional clearance requirements for fabrication yard lifts are covered in Section 13.8. 
11 
11 
11 
11 

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GUIDELINES
 
FOR
 
MARINE
 
LIFTING
 
&
 
LOWERING
 
OPERATIONS 
0027/ND Rev 11 
 
Page 59 of 84 
17 
BUMPERS AND GUIDES 
17.1 
INTRODUCTION 
17.1.1 
For module installation the arrangement and design philosophy for bumpers and guides shall be 
submitted, where applicable. In general, bumpers and guides should be designed in accordance with 
this Section taking into account of their use, configuration and geometry. 
17.2 
MODULE MOVEMENT 
17.2.1 
The maximum module movement relative to the target structure during installation should be defined.
In general, the relative motions should be limited to: 

Vertical movement: +/- 0.75 metres 

Horizontal movement: +/- 1.50 metres 

Longitudinal tilt: 
2 degrees 

Transverse tilt: 
2 degrees 

Plan rotation: 
3 degrees.
17.2.2 
The plan rotation limit is only applicable prior to engagement on the bumper/guide or pin/bucket 
system, and when the module is close to its final position or adjacent to another structure on a cargo 
barge. 
17.2.3 
Special consideration and agreement of relative motions with GL Noble Denton is required for cases 
where a module is being placed onto a floating target structure, as the motions of the target structure 
need to be considered.