System Commissioning is sequence by the Commissioning Philosophy which would initially will focus of Utility Systems deemed as critical path systems to be commissioned before the plants fire up or introduction of hazardous mediums.
DC Power and UPS System
The first electrical system to be energized during Commissioning would be the direct current (DC) power system, in some cases the specifications would require the DC system to be load tested in which would require the rental of temporary load banks for this testing. The DC power system provides power to the switchgear circuit breakers, equipment protective relays, and also powers an uninterruptible power supply (UPS), which supports the plant control system.
Initial Plant Energization
Initial plant energization of switchgear is an important Commissioning milestone which, in some onshore projects such as Power Plants requires coordinated planning between the plant and the public utility power suppliers should the plant not have its own power generation supply. Detailed procedure will be prepared, reviewed, and approved by the client or plant operations. where back feed power cannot be achieved in time to support the Commissioning rental of temporary diesel generators and transformers can be undertaken to provide temporary power.
Normally the first mechanical system to be started during Commissioning is the instrument air, instrument air is normally a complex system for Commissioning given it will normally cover the whole plant and feed instruments and controllers with considerable probabilities for leaks. The IA system should be closely monitored for proper indication during the initial operation with the blowing of the systems distribution piping, the air dryers should be monitored to prevent excessive flow and piping system must be blown out with dry air, with loops to instruments being cleaned vigorously.
The next mechanical system to be started would be water treatment system which also can be extremely complex and large, with complicated control systems. Chemical analysis equipment will likely be required to monitor the systems, and a suitable laboratory should be established on site. There may be a requirement to dispose of so the waste water treatment system is very important, and should receive a high priority in the Commissioning planning. In many cases waste water and solid waste export must be subcontracted to a third party specifically at a zero discharge facility.
Fire Detection and Protection System
Upon commissioning of the Fire Detection and Protection the Commissioning Experts will continue to monitor the testing closely, in order to become familiar with the system. Fire protection systems, such as sprinklers, deluge valves, and gas discharge systems may require a government inspector or an insurance company inspector to witness the testing. Fire pumps should be one of the first pumps to be placed in service, after the water supply system makes water available.
Commissioning Cooling Water systems that use seawater need special care during the Commissioning phase, due to the corrosive nature of seawater and the marine life and debris associated with seawater. Rakes, traveling screens, tube cleaning systems, and pump intake screens require special care during the Commissioning phase, to prevent the introduction of debris into the condenser. Large circulating water pumps need to be aligned carefully and accurately.
From here on system Commissioning will be establish based on the type of process being Commissioned as they will differ considerably between different processes.
We will be happy to evaluate you Commissioning Philosophy should you require third party verification on your project.
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