PRE-COMMISSIONING
Pre-commissioning is a construction procedure that includes checking the functional operability of elements within the system to ensure the system is ready for commissioning start-up.
Pre-commissioning activities include checking and ensuring the installed equipment is ready to operate, some of the activities are listed below, but not limited to:
- Installation of Seals and Packing
- Removal of temporary bracing
- Rotating machinery testing for correct rotation direction and freedom of moving parts before connecting driver.
- Checking and consistency of all lubricants, filling etc. before running the equipment
- Installing all safety devices on the equipment
- Protecting equipment before commissioning from normal weather conditions or damage
For Piping System
- Before testing and flushing, orientation plates, control valves and any other online instruments should not be installed.
- Piping device to the satisfaction of the client must be properly flushed and washed.
- The plans or requirements allow all piping to be tested hydrostatically and pneumatically.
- Vents are supplied at high loop points and after testing is plugged.
Instrumentation System
- Functional Check of all instrument and controllers
- Test the location of all valves according to the drawings.
- Checking all electrical signals and alarm cables for continuity, correct power source and polarity.
- Until commissioning, test all shutdown and safety systems.
Electrical system
- Continuity checking and insulation resistance testing for circuits of power and control.
- Earth continuity test for all circuits
- Verification of phase sequence
- Checking of Safety features for correctness of operation etc.
- Checking of all PLC wired interface contacts in panel and terminal equipment chambers, as necessary.
- A thorough visual inspection of electrical equipment in hazardous areas shall be carried out to ensure the equipment is appropriate for the designated zone and gas community and properly installed, with all covers, bolts, nuts, and hardware intact and no physical damage mark on the enclosure is observed.
Pre-commissioning activities will start to validate the equipment or component is fabricated, installed, cleaned, and tested in accordance with a design intend and ready for commissioning. Pre-commissioning activities includes energizing of equipment/ machines, flushing and cleaning, drying, leak testing, running of equipment, running of electrical motors, dry run, etc.
Our team will use Pre-commissioning checklists for different types of machines, equipment, and systems to record the result of inspection and to confirm readiness for commissioning. All these checklists should be witnessed by the CLIENT and Project Management Control (PMC).
Vendor specialists should be on site for major items of rotating machinery, major utility systems, special electrical & instrument control equipment, package units which have been assembled by others.
