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

Introduction

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

Introduction

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

Introduction

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 >

Mojo Maritime attends All Energy 2016, supporting the reduction of cost and risk in the offshore energy sector

4th May 2016

Mojo Maritime will be attending All Energy 2016 and showcasing Mermaid®, the market-leading marine operations planning and risk optimisation tool.

In a speaking slot during the “UK Marine enabling technology programmes” session (in the Lomond Auditorium at 4pm on 4th May), Steve Jermy will present a number of innovative solutions developed by Mojo Maritime, including the HF4 vessel.  Mermaid underpinned the development of these solutions and Steve will discuss how and why Mermaid can benefit other projects. Read more >

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

Introduction

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 >

Analysing Wind Farm Foundation Installation – Part 7: Two Vessels – The Division of Labour

In the last post we arrived at a strategy which we like, this being:

  • Start our operations sometime in March.
  • Use two vessels, unfortunately we can get the two we’d like though, so we’re using a slight cheaper, slightly less capable vessel as our second.
  • Modify the capable vessel so it can carry more foundation units per trip (3).

However, we saw that the division of labour we’d set wasn’t optimal and that we off hired one of our vessels early and lost some of the advantage gained by this strategy. Read more >

Mermaid Release Notes: Version 1.1.0.13

Our latest release is now out and adds some new features to improve the usability of Mermaid and to allow further interrogation of your results sets.

New Features

MM-1289: Display comparative results in Exceedance charts.

It is now possible to plot data from multiple simulations on one Exceedance chart, allowing direct visual comparison of the results.  To plot multiple results sources on one chart use the control keyboard key to multi-select in the “Results Source” box under “Chart Options”.  It is also now possible to name results sources rather than using their file names. Read more >

Analysing Wind Farm Foundation Installation – Part 6: Work Faster – Two Vessels On Hire

As we’ve moved through this analysis process and applied Mermaid to the consideration of how we can baseline and improve our performance two main objectives have repeatedly arisen:

  • Work entirely in the spring and summer to reduce winter downtime.
  • Maximise the time spent performing offshore operations when favourable conditions occur by reducing the number of transits required.

Here we are going to perform two simulations which it is hope will improve our performance.

The Simulations

There are two scenarios under consideration here:

  • Two vessels operating, both vessels can carry a set of foundations at a time, one vessel is from the base case, the other is a different, slightly less capable vessel (i.e.
Read more >

Analysing Wind Farm Foundation Installation – Part 5: Reduce Transits to Improve Performance – Offshore Resupplies

In this post we’re going to look at bringing the foundations to the installation vessel at site.  It’s thought that, as with carrying more components, we can increase the working time by transiting less.  If another vessel (a barge and tugs) brings components to the main vessel the transit requirements are reduced, although it’s worth noting that offshore transfers of this type are quite strictly limited; the trade-off between transit reduction and sensitive operations is the main concern here.

The Simulation

Our base case simulation includes the transfer of installation components to the installation vessel from a storage barge in the port.  Read more >