ESOX+ for Complex Scenarios

The Difference between ESOX and ESOX+

We have used two different tools for sequential downtime modeling:

 

  • ESOX is our user-friendly, simplified Excel-based tool available as freeware, which works only with the ERA5 data from the ESOX website. We also provide custom-built, paid versions of ESOX based on individual client requests.

     

  • ESOX+ is our advanced, flexible Matlab-based tool for high complexity modeling, which is run by our internal staff on a consulting basis. We do not provide the tool itself to our clients.

Compare ESOX and ESOX+
Automated generation of a task list for cycle-based work campaigns
Manual editing of individual tasks in the auto-generated task list
Multi-variable constraints
Learning curve modeling
Generate weather calendars for P6 and MS Project
Milestone completion statistics
Root cause analysis
Annual campaign simulation for each reanalysis year
Global ERA5 metocean time series data
Full log of simulation steps for validation of results
Any number and type of time series data available or derivable
Parallel, interdependent activity streams
Shared inventory modeling
Shared resource modeling
Interdependent workability limits (e.g. wave period/height plots)
Weather window requirements with non-constant limits
Advanced root cause analysis
ESOX+ DATA EXAMPLE

Unlock the Full Potential of Your Installation Setup

Visualize the root cause for downtime, identify the bottlenecks and optimize your construction setup accordingly.

ESOX+ DATA EXAMPLE

Storage Area Size Evaluation

Will the installation vessels run out of components in a P30 scenario? How likely is it that the storage capacity limit will be reached, stopping the inbound logistics? Dimension your storage capacity by modeling inbound and outbound logistics.

(A) Risk of storage at max capacity (12 WGTs): Inbound logistics on standby until the next load-out of components.

(B) Risk of running out of WTGs at staging port: Coupling of load-out activities and storage level.

ESOX+ DATA EXAMPLE

Interdependent Workability Criteria

Model interdependent operational constraints, such as floating operations with interdependent wave periods and wave heights.

Fixed, individual limits on wave height and wave period leads to overly conservative downtime estimates. Identify all workable periods by modeling the correct Hs-Tp curves instead.

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ESOX+ Implementation Case

Project: Supporting a +500MW offshore wind project in the US Atlantic Coast by analyzing the transport and installation options.

Challenges: The logistic options including several vessels feeding components from different harbours to a main installation vessel located at the offshore site. The following questions arised:

  • How do the feeder vessels’ performance impact the construction schedule?
  • How many feeder vessels are needed in order to keep the main installation vessel busy?
  • What does the port in-/outbound logistics look like?
  • Will the rate of inbound components be sufficient?
  • Will the port storage be able to accommodate all components during the installation program?
  • How would alternative port locations impact the installation program?

Outcome: LAUTEC helped to answer these questions in detail by implementing the case data in ESOX+ combining the modeling of parallel activity streams, shared inventory modeling, shared resource modeling, interdependent workability limits, weather window requirement with non-constant limits and detailed root cause analysis.