When talking about commissioning, the following phases shall be actually considered: Precommissioning, Commissioning and Start-Up.
Their definition may vary from one Operator to another one.
The definition in the IXIS methodology is as follows:
A_ Precommissioning: it comprises all cold testing activities. No energization is required. During this phase, all elements are checked for proper installation.
B_ Commissioning: it comprises all hot testing activities. Energization is required. During this phase, Equipment are checked for proper functioning. No process fluid is involved.
C_ Start-Up: Corresponds to the Process Fluid introduction.
Anyway, IXIS will adapt its Work, including the Ixiscom Commissioning software format, to suit the Client definitions.
Project precommissioning and commissioning activities are executed to ensure a safe, smooth and quick Plant Start-Up: this is of the utmost importance since Production is at stake.
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