Causes of delay in offshore wind turbine construction projects

Lerche, Jon; Lindhard, Søren Munch; Enevoldsen, Peter; Neve, Hasse H.; Møller, Dan Eggert; Jacobsen, Emil L.; Teizer, Jochen; Wandahl, Søren

doi:10.1080/09537287.2022.2026673

Cited by 10 publications

(6 citation statements)

References 89 publications

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“…They reported how the offshore wind farm infrastructure is assembled in accordance with its technical dependencies, and noted that technical dependencies appear to make the ordering of processes predictable and replicable. This is the case especially for installation processes that require equipment (e.g., cranes, purpose-built vessels, or underwater robotics) (Barlow et al 2018), which might explain why offshore installation in particular has been planned using CPM (Lerche 2020). When a technical dependency is broken, schedule adjustments can be made, e.g., if a foundation is installed but cabling is not complete, the turbine can be installed but not commissioned, and temporary power generators would be required to sustain its product integrity (lifetime expectancy) until the cabling is completed.…”

Section: Processmentioning

confidence: 99%

“…Installation vessels being the main cost driver, with an average rate of €250,000/day, has made both developers of offshore infrastructure and their supplier pool of manufacturers (cables, transformer stations, foundations, and turbines) conscious of vessel capacities and costs. Consequently, they have shifted their focus to limiting the time spent offshore (Lacal-Arántegui et al 2018;Lerche et al 2020Lerche et al , 2022. Although onshore wind farm infrastructure development and project execution use less expensive equipment, the relative cost of equipment is still considerable.…”

Section: Costmentioning

confidence: 99%

“…Wind farm infrastructure installation requires only a few trades, electrical and mechanical trades being the primary ones, where specialized resources for specific process steps are seen as 'off-takt'. Lerche et al (2020Lerche et al ( , 2022 defined process steps according to module type and trade required (Figure 2):…”

Section: Defining the Taktmentioning

confidence: 99%

“…The takt is then calculated according to the beat of procedural step 2. Lerche et al (2020) found that installation vessels set the beat, providing pre-assemblies with a turnaround rate that could be divided by the number of modules in a batch. Such a calculation would also apply in case additional units of large equipment (e.g., purpose-built vessels) are introduced.…”

Section: Defining the Taktmentioning

confidence: 99%

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Comparison of Takt Planning Methods Used on Projects of Different Types

Tommelein¹,

Lerche²

2023

Proceedings of the 31st Annual Conference of the International Group for Lean Construction (IGLC31)

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Takt planning has been used to deliver projects of different types and in different industry sectors. We presuppose here that the methods used to develop project takt plans therefore must vary. To test whether this presupposition holds we consider two different project types (wind turbines and healthcare facilities) and compare sample projects of these types in terms of the rationale that was applied when developing their takt plans. We show that the rationale takes into account the relative cycle times and associated resource costs of individual steps in their production processes, considering the dependencies between those steps and between processes. Little has been written in the literature to date about the relative costs of process steps in takt plans, and how these costs affect the opportunities planners have and choices they make when leveling workloads to determine the so-called "operable" takt time. That is done here. This paper contributes to the literature on takt production used to deliver construction projects by describing theoretical concepts that help to differentiate takt planning methods used to plan projects of different types.

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Section: Processmentioning

confidence: 99%

Section: Costmentioning

confidence: 99%

Section: Defining the Taktmentioning

confidence: 99%

Section: Defining the Taktmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of Takt Planning Methods Used on Projects of Different Types

Tommelein¹,

Lerche²

2023

Proceedings of the 31st Annual Conference of the International Group for Lean Construction (IGLC31)

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“…Stakeholder judgement is important in selecting the relevant criteria, in identifying their weights, and in scoring the options examined against each objective. While this approach is at the core of MCDA techniques, its subjective nature is often a cause of concern, and even acrimony, amongst the stakeholders, often leading to protracted periods of negotiation 19 , 20 .…”

Section: Introductionmentioning

confidence: 99%

An intelligent methodology for the use of multi-criteria decision analysis in impact assessment: the case of real-world offshore construction

Tsakalerou

Efthymiadis

Abilez

2022

Sci Rep

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Impact assessment of large-scale projects involves a plethora of technical, economic, social, and environmental factors that must be assessed along with the expectations of the stakeholders of each project. While impact assessment is required for a development project to receive regulatory approval to proceed, it is also an invaluable tool during the design phase of complex projects, providing for informed decision-making. Molding multiple perspectives of diverse stakeholders into a single collective choice is a key challenge in the process. Multi-Criteria Decision Analysis (MCDA) is the methodology used to rank a finite number of decision options based on a finite set of evaluation criteria. Different MCDA techniques, however, may lead to different decisions when applied to the same problem while different sets of criteria and weights may rank choices differently even when the same method is applied. This is a cause of concern, and even acrimony, amongst the stakeholders, often leading to protracted periods of negotiation and delaying project launching. The objective of this paper is to present an intelligent system to ameliorate the effects of the inherent subjectivity in MCDA techniques and to develop a consensus amongst the stakeholders in a data-driven setting. A case study from the field of offshore construction is used as a running example. This case study, informed by real-world experience in the field, demonstrates succinctly the issues involved and illustrates clearly the proposed intelligent methodology and its merits.

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