Guild of Project Controls: Compendium | Roles | Assessment | Certifications | Membership

Tips on using this forum..

(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?

(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.


2 replies [Last post]
Mark Copland
User offline. Last seen 7 years 3 weeks ago. Offline
Joined: 22 Mar 2014
Posts: 4

Dear all, Currently been tasked with detailing the resources we require as the isolating department. Upcoming shutdown is a fairly varied work scope involving several different plant systems. We only have 3 technicians per shift. Our onshore focal point has voiced doubts that we can provide the required isolations in the current time frame suggested. Manpower itself is not an issue as we can use the maintenance and construction personnel as muscle but the control of the isolations will be hard to manage. Any tips on how to efficiently manage valve tagging on this scale etc would be great. We have very tight controls for minor PPM type isolations but these will have to be relaxed slightly to speed equipment preparation. Also any idea on how I should try and workout isolation timings as the big hitter is the flare system with approx 500 isolation items and no guarantee all tie in valves will hold. Any help on estimations would be a great boon to us. Thanks for reading and please advise if you can Best regards Mark


Gary Whitehead
User offline. Last seen 1 year 44 weeks ago. Offline

Moved to STO forum

Rafael Davila
User offline. Last seen 2 hours 47 min ago. Offline
Joined: 1 Mar 2004
Posts: 5010


My involvement in shutdown jobs have been very limited but still there are some scheduling issues I would like to share.

  1. If you are referring to regular maintenance jobs then the availability of materials can be relevant and must be followed up as any delay in materials will delay activities. Materials are best handled using consumable resources, something you cannot do using regular resource modeling.
  2. Seems like the scheduling of your jobs is so dynamic that in order for scheduling software to be useful some daily or perhaps a per shift schedule update might be necessary.
  3. Some of the most common software cannot handle different shifts on the same activity and shutdowns usually are performed using different shifts. That your software have something they call shift calendars it does not means they are functional for complex scenarios.
  • You can try yourself a simple scenario.
  • Activity 1 500 cm rock excavation
  • Resource 1 production 10 cm/hr and works Monday, Tuesday and Wednesday 10 hrs/day
  • Resource 2 production 15 cm/hour and works on Wednesday, Thursday and Friday 10 hrs/day
  • If activity starts on Monday:
  • Monday =>> Resource 1 will produce 100 cm
  • Tuesday =>> Resource 1 will produce 100 cm
  • Wednesday =>> Resource 1 will produce 100 cm
  • Wednesday =>> Resource 2 will produce 150 cm
  • Thursday =>> Resource 2 will produce 50 cm in about 3 hours
  • Activity will take 3 days 3 hours.
  • If activity starts on Wednesday :
  • Wednesday =>> Resource 1 will produce 100 cm
  • Wednesday =>> Resource 2 will produce 150 cm
  • Thursday =>> Resource 2 will produce 150 cm
  • Friday =>> Resource 2 will produce 100 cm in about 7 hours
  • Activity will take 2 days 7 hours.
  • If your software is not capable of modeling the above, simple shift work on a single activity, then you are using the wrong tool. Every time the activity is delayed, the distribution of work is shifted, when you have many such activities and work on different hour shifts, different days it can become quite complicated. For a single shot you can use incapable software with manual distribution of work among shifts for anything else distributing work by hand is nuts.
  • Sorry my example is a civil works example as this is what I do, but I suspect you plan your jobs using resource or whole crew productivity and their compositions and production rates can vary depending on the shifts that in your case can be 3 shifts - 8 hours per shift.
  • Shift production rates photo Shiftproductionrates_zps61c38c96.jpg
Best Regards,Rafael