One of our most critical activities during the life of a project, is that of creating the punch list, my topic today is based on this important task.
The typical punch list is a record of all incomplete work at the point where construction believe they are complete and wish to transfer care, custody and control to the commissioning team, hence the importance of the punch list as it’s the commissioning team chance to fully check-out the system before handover.
Punch listing therefore can take additional forms, pre-hydro test, pre-loop test, independent project discipline, (mechanical, electrical, instrumentation etc.) punch lists, but the one we as a commissioning team usually really get involved with, is the final punch list prior to handover, being involved in the others mentioned here is good for learning, but the commissioning team is usually only involved in a witness capacity.
It is again worthy of mention here that the punch list is the final check prior to handover, so please consider a scheme on your project where issues found early during construction, for example a control or non-return valve installed in the wrong direction of flow, are identified and more importantly rectified well before the punch list is formally undertaken.
As advocated in the punch list section of my book, the punch list should be undertaken by at least two commissioning team members, one to draft findings and one to inspect the installation. The punch list should be compiled again the latest issue of the relevant P&ID’s, but other supporting documents such as the isometric drawings can also be used. I have also found that once the punch list is compiled, returning to the office and having a check list of what should have been checked, generically, is always a good idea for when actually out punch listing on complicate large systems, items can be missed.
So a large topic, but the highlights are here today to remind us that compiling a detailed and accurate punch is one of our most important activities.
Safe and successful commissioning always…