DNV GL circular on bulk cargo liquefaction

Loss Prevention

Published: 29 October 2015

We refer to the enclosed circular issued by DNV GL, which is an excellent summary of the dangers and challenges involved when carrying cargo which may liquefy.

The circular is also dealing with issues related to structural strength of bulkers and the effect liquefying cargo may have on the hull.

Table of contents

  1. Introduction
    1.1 Background
  2. What is bulk cargo liquefaction?
    2.1 Liquefaction of granular materials
    2.2 Liquefaction of very fine (non-granular) materials
    2.3 Transportable moisture limit (TML)
  3. What are the risks for the vessel?
    3.1 Liquefaction
    3.2 Sliding
  4. Which cargoes are subject to liquefaction?
    4.1 IMSBC Code group A
    4.2 Nickel ore 
    4.3 Iron ore fines and iron concentrate (Sinter feed)
    4.4 Bauxite
  5. Operational guidelines
    5.1 Wrong cargo name
    5.2 Cargo not listed in IMSBC Code
    5.3 TML
    5.4 Moisture content prior to loading
    5.5 Increased moisture during loading and during voyage
    5.6 Vessel motions and GM
    5.7 Trimming of load to avoid shifting/sliding
  6. Design guidelines - specially constructed or fitted cargo vessels
    6.1 Certificate of fitness
    6.2 Stability evaluation
    6.3 Hull strength evaluation
    6.4 DNV GL involvement
    6.5 Special considerations for bulk carriers
    6.6 Special considerations for ore carriers

For vessel specific enquiries, members are asked to contact their usual Skuld business unit.

For further information, members are asked to contact the Association.