Explaining OPERCOM methodology in commissioning:

Here i am trying to explain about the role of Opercom and in oil and gas commission activity

What is Opercom ?

  • Opercom is a test methodology tailored to oil & gas production and treatment,installations, which has been proving its worth for more than twenty years now.,Opercom is for Commissioning specialists. The methodology is used by the dedicated,teams responsible for preparation during the engineering phase and for execution at the,end of the project.,Opercom training modules are available for future users. Total has signed agreements with training organisations for providing them. How long is the course? One week.OPERCOMTM is used in the Pre-commissioning and Commissioning phases, before handover,to operations. It is a tool that ceases to be used at the end of the project.,The OPERCOMTM methodology can also be used to test exhaustively any modifications,executed on an existing installation.,An installation tested down to the smallest detail will be operational faster and more safely,with the OPERCOMTM methodology!

Certifications and Handover in Project?

What is Pre-Commissioning Phase ? (Issuing RFC after completion)

The Pre-commissioning phase includes three main types of activities:

  • Conformity checks.
  • Static/de-energized tests.
  • Piping tests.

On completion of these tests, an “RFC” (Ready For Commissioning certificate) is issued for each Sub-system.

What is Commissioning? (Issuing RFSU after completion)

  • Commissioning is a major activity in a project: it is the final quality check before transfer to the start-up team. It is also the key to ensure a smooth and quick ramp up to the production plateau as planned. Commissioning engineering should start early in the project with some input already during Basic Engineering and during the Call For Tender preparation. The Commissioning competencies of the selected EPCC contractor, and of its specialized sub-contractor are crucial and must be combined with a mobilization plan well suited to both the contractor and the company. Feedback at the end of the project is essential to help us improve our knowledge and our technical standards.

The Commissioning phase essentially comprises three types of tasks:
> Dynamic verification.
> Testing with substitute fluids,
> The preparation of the piping and vessels for start-up.
On completion of these tests, an “RFSU” (Ready For Start Up) certificate is issued for each Sub-system. There is then a transfer between the Commissioning entity and the Operations entity.

What is  punch list?

  • Items that have not successfully passed the tests are listed in a punch list. They are managed in accordance with certain priorities (A, B, C) such that items ranked priority”A” are to be cleared before the RFC can be signed.

Features of Opercom 

A multi-discipline methodology:

  • The OPERCOMTM methodology spans all the activities and every branch of discipline: Mechanics,Piping, Process, Electricity, Instrumentation

A reliable and duplicable methodology:

  • Designed in the late 80s to test oil & gas installations, OPERCOM is now recognized for the breadth of its industrial spectrum: agro-industry, building and civil engineering…Used for over twenty years now, the method has benefited from the feedback very many projects which has further enhanced its reliability. Any installation in any sector of activity can be tested using the OPERCOM methodology.

A fully comprehensive methodology:

  • With OPERCOM, it is impossible for any item to be left out of testing! Each discipline – Mechanics, Electricity, Instrumentation, etc. – draws up check lists to be processed by Commissioning. There are several thousand items for each project. And a test card for each test. With the complete set of documents, tractability objectives are always met.


  • OPERCOM methodology relies on a series of four E&P General Specifications:

1. GS EP EXP 101: (Pre-commissioning and Commissioning specification)

This General Specification defines:

> the different phases of a project in relation to Commissioning (the test phase),
> the certification steps,
> the organisation,
> the certification methodology.

  • In compliance with the OPERCOM methodology, to leave nothing to chance, installations are broken down into Systems and Sub-systems, with a transfer of responsibility at each step. Specification GS EP EXP 101 sets out the organisation to be put in place to prepare and execute the Commissioning. This way, the role and responsibility of each person are clearly defined. Likewise, Specification GS EP EXP 101 frames the Handover of the installations to the Operator or the end Client.

2.GS EP EXP 103: (Pre-commissioning and Commissioning technical preparation)

  • After the key step of breakdown into Systems and Sub-systems, Specification GS EP EXP 103 organises the technical preparation of Pre-commissioning and Commissioning, detailing how the tasks on the equipment to be tested are allocated.

This comprises three phases:

  • > the general preparation phase: the documents pertaining to management, and the procedure for logistics, organisation and reporting.
  • > the preparation of Pre-commissioning: for each System, Sub-system and item, tasks to be carried out on the equipment to be tested are allocated.
  • > the preparation of Commissioning: allocation of tasks to the small subassemblies

    to be tested, and drafting of the Operational Test Procedures (OTP).

3. GS EP EXP 105: (Pre-commissioning execution)

  • This set of some 400 test sheets indicates in detail all the verification’s and all the tests to be carried out as part of Pre-commissioning.

4. GS EP EXP 107:( Commissioning execution)

  • This set of some 100 test sheets indicates in detail all the verification’s and all the tests to be carried out as part of Commissioning.


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