Vessel Utilisation – Part 5: The analysis of results outside Mermaid


In the last part we looked at how we can use Mermaid outputs to perform a bespoke analysis and discussed the process of writing a script to extract additional information.  This example is reasonably simple, but the timestep by timestep nature of the results allows substantial detail to be considered.

In this post we’ll take a look at the results we generated by running this script on our cases, considering only simulations starting in June.  We’ll also consider the process we have undertaken and the impact that this type of analysis can have on the success of a project. Read more >

Vessel Utilisation – Part 4: An overview of bespoke post processing


So far in this series we have prepared and run a number of simulations and considered the results in Mermaid, all with the aim of answering the question:

“When should we take the trenching vessel on hire, relative to the installation vessel?”

We saw in the last post that our base case offset (32 days) is a fairly good position, however, we think there might be opportunity to improve on this.  The issue we have is that our post-processing requirement is outside the type of charts and tables offered by Mermaid.  Read more >

Vessel Utilisation – Part 3: The analysis of results using Mermaid


Last time we finished the setup of the analysis by preparing the flow diagram.  We considered a number of options for modelling these tasks, ultimately selecting a clean, simple and easy to maintain approach.  We also performed a number of simulations.

In this post we will take a look at the results we have generated and will consider the impact these can have on our decision making.  Finally, we’ll make some decisions regarding the next steps we should take.

Box Whisker Charts

In this post we are going to analyse our results using Mermaid’s “Duration Box Whisker Charts”, here’s a quick overview of the data represented by different elements of these. Read more >

Vessel Utilisation – Part 2: The simulation of cable lay operations


Last time we outlined the analysis of cable installation operations for a hypothetical operation at WaveHub.  We looked at the map and the shelter characteristics of the vessels we intend to use and outlined the main objective of the analysis, which is:

“When should we take the trenching vessel on hire, relative to the installation vessel?”

In addition we sketched out our operations, at quite a high level, ahead of putting them in to Mermaid, this sketch is shown below:

Overview Flow Diagram

In this post we are going to look at how we can model these operations in Mermaid and consider, in a little more detail, how we vary the length of the lay and trench operations. Read more >

Vessel Utilisation – Part 1: The analysis of on hire times


Marine operations often require multiple vessels which are assigned specific tasks to perform.  Often the tasks performed by the vessels are independent of each other (i.e. the vessels work alone) but are linked in such a way that one vessel is dependent on the other completing work.  In this series of posts we are going to consider cable lay and trenching operations using two assets.  We’ll also look at the consideration of the simulation results both in Mermaid and as part of a bespoke analysis outside Mermaid. Read more >