W7.1_AI_Developing Operation & Maintenance Model for Offshore Regasification Facility Project


  1. Problem Definition

Besides capital expenditure, one of the cost components which is needed in financial economic model is operation and maintenance cost. Still discuss about offshore regasification facility project, this week I will develop operation and maintenance model for the project, and this WBS would be applied for O&M activities provide by owner so it will be covered the asset of onshore receiving facilities and pipeline. As for the initial stages in building O&M model is determine cost structure. In making the cost structure of a project, the first thing to do is by determining work breakdown structure (WBS). In this week, I will choose WBS standardization between omni class and norsok to be applied.

Figure 1. Business Scheme

  1. Identify the Possible Alternative

There are two commonly used WBS standardization among others:

  1. OmniClass
  2. Norsok

Both of this standard would be compared and the optimum WBS standard would be chosen.


  1. Development of The Outcome for Alternative

Table 1. OmniClass Table

The table above is 15 hierarchical that is designed to provide a standardized basis for classifying information. Each of it represents a different phase of project information and every entity can be combined one and another, to build more complex structure.

Moine has developed a 3D WBS model. All of three dimension project can be integrated which visualized as figure below:

Figure 2. 3D WBS Model


Norsok Standard describe a system for cost coding and weight estimates and as-built or experience data. The following is coding system classification of Norsok standard:

Figure 3. Norsok Standard


  1. Selection Criteria

Cost structure which can be applied from OmniClass standard to O&M model of Offshore Regasification Facility Project consists of:

Table 2. WBS Matrix

The table above shows matrix from omniclass table to being an input for develop 3D WBS structure.  The 3D WBS is based on three main dimensions consist of Zone Breakdown Structure (ZBS), Product Breakdown Structure (PBS) and Activity Breakdown Structure (ABS).

While the applicable cost coding of Norsok Standard to O&M model of Offshore Regasification Facility Project consists of:

Figure 4. Operational Principles Norsok Standard

Using Norsok standard some parameter must be identified at the first place:

  1. Operating Concept
  • Operation objectives
  • Operating environment
  1. Operating Philosophy
  • Criticality
  • Complexity
  • Choice of technology
  • Training and sparing
  • Manning and personnel competence
  1. Production function requirements
  • Production operations (general, start-up, shut-down, isolation for maintenance, well testing, well intervention)
  1. Maintenance function requirements
  • Maintenance strategy
  • Maintenance engineering (design, organization, programs)
  1. Inspection strategy


  1. Analysis & Comparison of Alternative

Both standards can be applied in operation & maintenance model of offshore regasification project. But one of the most optimum methods must be chosen to be applied in this project. Considering that the methods used is top-down and from owner perspective, as well as on business scheme operation & maintenance facilities will be contracted to a third party (ship management) using the Long Term Service Agreement, so to coverage of O&M model consists of head quarter for office activity, along onshore receiving facilities and pipeline.

Considering it is then the most optimum standard used is OmniClass standard.

The developed WBS will be follow this criteria:

  • WBS Phase related to the asset
  • WBS Area related to the asset
  • WBS Service related to the asset
  • WBS Organization Role related to the asset
  • WBS Element related to the asset

Table 3. WBS Value Score

Table 4. WBS Weighted Score

  1. Selection of the Preferred Alternative

Based on above description, it shows that the combination of Omniclass table with 3D WBS is better than the single standard. As we can gain deliverables that can be view from many perspectives. Then OmniClass 3D WBS is considered to be applied for Offshore Regasification Facility Project. The rating of OmniClass 3D WBS as follow:

Table 5. OmniClass Table Rating

Rating no 1 up to no 6 will be develop as an input for 3D WBS of Offshore Regasification Facility Project.


  1. Performance Monitoring and The Post Evaluation of Result

This 3D WBS is very suitable with condition of current business scheme, so it will have a positive impact on the company for developing it. But also the company need to consider another standard like Norsok as a validation against third parties, or when the business scheme changes, such as the company responsible as a facility operator & maintenance.


  1. Planning Planet (2017). Creating Work Breakdown Structure.

Retrieved from http://www.planningplanet.com/guild/gpccar/creating-work-breakdown-structure

  1. Sullivan, G. W. (2014). Engineering Economy 16th Chapter 3 – Cost-Estimation Techniques, pp. 96-98.
  2. Hendarto, T. (2017). W6.1_TH_ Standardized WBS Structures for Gas Station Project-Part 3

Retrieved from https://emeraldaace2017.com/2017/09/22/w6-1_th_-standardized-wbs-structures-for-gas-station-project-part-3/

  1. Norsok Standard. Retrieved from


  1. OmniClass Standard. Retrieved from



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