GUIDELINES FOR MARINE LIFTING & LOWERING OPERATIONS 0027/ND Rev 11 Page 36 of 84 9 OTHER LIFTING EQUIPMENT DESIGN 9.1 INTRODUCTION 9.1.1
The following section covers the design of other lifting equipment used for lifting operation using the
loads derived in Section 5. The various factors and their application are illustrated in Figure 5-1 which
is for guidance only, and is not intended to cover every case. In case of any conflict between the
flowchart and the text, the text shall govern.
9.2 LIFTING TOOLS 9.2.1
A lifting tool is defined as a hydraulic tool that is internally or externally connected to a tubular
receptacle. The receptacle could be a pile or a purpose built lift point.
9.2.2
The working load limit (WLL) is generally used as reference for the strength of the lifting tool. The WLL
is normally determined by the lifting tool manufacturer or a Certifying Body.
9.2.3
Where lifting tools are used as part of a lifting arrangement, the maximum loads imposed on such tools
shall not exceed the stated certified WLL for the tool. The WLL should be listed for use in the vertical
and horizontal lifting configuration and intermediate orientations between these two conditions.
9.2.4
It shall be ensured that the material quality, dimensions and geometry of the tubular receptacle for the
lifting tool are compatible with the tool. As a minimum and where relevant, the following should be
checked and documented for the receptacle:
Steel hardness should be sufficiently low to ensure adequate grip.
Dimension/s (normally the diameter and wall thickness) is/are within the tool specification.
No weld seams or other imperfections that could jeopardise the tool functionality.
The gripping surface should be free for loose rust, grease and paint.
9.2.5
The receptacle shall be treated as a lift point and subject to the consequence factor applicable for lift
point design (see Section 11.4). The design shall also include the effect of the loading from the lifting
tool in the design, with this effect also increased by the same consequence factor.
