Oke, Crude Terminal.
You have to change high voltage isolators. This means that the crude terminal will be without electricity for about 4 hours.
Do you go and pull the main breaker because you have to do the job?
You have also a leaking valve that you want to change in the main header. On monday morning you start dismantle? If your answer is yes on these questions, I have serious doubts about your permit to work system.

Oke, doesn't need PTW to tell these jobs require shudtown. However, how often you have these jobs in your refinery? In my plant none as I remember. Leaking vlv, maybe can furmanite?. HV isolator, maybe can switch over?

Opportunities

every 4 years T&I turnaround
once a year decoking visbreaker heater
once or twice a year inspection vacuum overhead condensors. All jobs are in a narrow time frame because of time constraints.
We do not have the luxioury of redundant equipment. A shutdown can be units on hot or cold circulation for pre-determined period
Shutdown with steam-out and gasfree, only during T&I turnaround.

quote:

BTW there are always jobs which can be done more efficient (save) during an outage, these jobs are planned and will be executed during the next (complete / or partial) shutdown. So when there is a change of going down, the list is brought-up to determine if it is the appropriate opportunity.

If willing to discuss further, how do you bring up the list (sound simple), tracked using CMMS or tracked manually outside it? If using CMMS, how does it know which jobs to be executed at next opportunity/shutdown?

The items are discussed by Maintenance, Operations and maintenance & process engineers. In most cases Maintenance and Operations are the biggest stake holders. The tasks are identified and receive priority 4. That is how we keep track of them in the CMMS. Aside that, these tasks are discussed in our regular technical meeting as long as all parts/resources needed are not on site.
We have always a back-up list outside the CMMS. Mine I pinned on the cork board behind my chair, with the WO numbers, Just a plain half A4