Let us today appraise what typically can make up the pre-commissioning phase of our projects.
Simplistically, pre-commissioning activities are those centred on getting a system ready to actually “do” some commissioning and also any commissioning activities we can conduct which do not require the introduction of any energy, be that electrical or introduction of air and water and the pressurization of equipment. The activities which we will address in a moment can be either completed by the commissioning team, or by the craft contracting organization responsible for the installation, but if not conducted by the commissioning team a suitable program to witness the activities being done must be put in place. Who does what during this phase if not totally controlled by the commissioning team, should be documented in detail and be part of the suite of documents that make up the contract between all the parties.
So here I offer my list of the activities which constitute pre-commissioning:
- All cleaning – Pipes, vessels etc. to include flushing with water, blowing with air or nitrogen (or both), chemical cleaning and pigging
- Full functional loop testing of instruments – from the DCS workstation right through to field devise (taking into account wi-fi testing if required)
- Electrical testing – bump tests on motors
- All lubrication and greasing of pumps, motors and other items
- Cold alignment of motors etc.
- …and a major pre-commissioning activity, the punch listing of a system
In addition the following checks responsible to be completed by the commissioning team may also be undertaken, if these activities are to be carried out whilst the system is under the control of the construction group, then obviously the correct safety protocol must be observed:
- Checking the operation of mechanical locking devices
- Checking the internals of non-return valves are installed
- Ensuring pipes fall in the direction required on the P&ID
- Procedure to check provision of weep holes in Relief Stream vent pipe-work
- Procedure to check installation of thermal refractory lining
- Packing of a Distillation or Scrubbing column
- Packing a Reactor with Catalyst
- Filling of desiccant into Drying Tower
- Installation of filter medium and cartridges .
- Installation of filter bags into a Bag House or Dust Collector
- Procedure to check flexible couplings and bellows are fit for operation.
- Filling a Mill with Beads
Ensure please always a robust tracking system is in place to monitor progress of these activities within a system and always complete the paperwork as proof of us conducting these actions.
Safe and successful commissioning to you always…