Pre - Commissionig

It refers to activities undertaken during construction that prepare and allow the unit to move to the main phase of commissioning.

The Pre-commissioning activities include:

• Installing filters

• fillers and packaging installation in distillation columns

• Filling catalysts in reactors

• Verification of testing, inspection and nondestructive testing

• Check hydrostatic testing

• Cleaning pipelines and equipment

• factory acceptance testing at site

• List and monitoring of pending construction  and instrumentation activities ( “punch list”)

• Verification of control loops

Documents and typical activities at this stage


• Definition of Operating Systems

• Procedures of Washing, blowing, Chemical Cleaning, Equipment Inspection (Elec-Mec-Ins)

• Final equipment Close, Alignment, Static tests of electrical equipment, instrumentation, among others.

•Verification and filling  Lubricants 

• Verification and filling Seals

• Setting protection

• Control “Punch List”

• Operation and Maintenance Manuals

• Procedure list Blind Points, terminal points aand  Adjustment of Bolts

• Commissioning & startup Sequence

• Planning

This phase of the project begins once has completed much of the mechanical completion of the plant or systems.

The process includes: verification under design, verification of mechanical, electrical and instrumentation, cleaning equipment and piping, and equipment and systems previous adjustments.


In commissioning the various systems and equipment components are placed first in initial operation. Constitute the dynamic checks each element (electrical, instrumentation, piping and equipment) enabling condition to facilities that integrate operating systems to initiate activities Boot or Startup and stabilizing them safely, smoothly, and achieve production and yields of products for which they were designed and planned.

Examples of some of the activities performed during commissioning:

• Inerting

• Leak Test

• Mechanical Testing of Rotating Equipment

• Functional Testing Equipment and Systems

• Functional Tests Control Loops

• Setting Protections

• Energized electrical systems

• Load of Chemicals

• Operational Testing

Commissioning, set of activities (tests) carried out with energy or process fluids, in order to review and verify the integrity and smooth functioning of instruments, equipment and processes or systems, ensuring, of the success of the Startup“. Engineer, Juan Mendez, ICG Commissioning