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How to incorporate operational interruptions ...

6 replies [Last post]
Mon, 2004-10-25 03:33
Billy Hui
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How to incorporate operational interruptions into construction scheduling ( MS Project and P3) ?

Operational interruptions means those prescheduled or probabilistic events such as holidays or breaks as set in resource/activity calendars (involving multiple resource calendars), equipment breakdowns (updating progressed schedule) or any environmental delays etc.


Best regards,

Billy Hui
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Replies

Tue, 2004-11-02 09:43
#1
Billy Hui
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Erik,

Thanks for your help.

Regards,

Billy.
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Mon, 2004-11-01 01:36
#2
Erik Jonker
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Billy ,

If you have to mangage your whole project at such a level, MS-Project is not your answer. Try P3 or a package that processes resources in the same way.

See my other posting for P3 http://www.planningplanet.com/forum/forum_post.asp?Cat=2&Top=6990

Other wise use a spreadsheet to interface your critical critical resources.

You just can’t do something like this with MS-Projects.

Regards,

Erik
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Sat, 2004-10-30 13:51
#3
Billy Hui
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A better version :

......would change to 7 days after scheduling. The following figure would show the situation. X means holiday and both resources will work 5 days to complete the activity.

1234567
oXXoooo Eng1
ooXXooo Eng2

o: task working or business day.

How can I get 8 days as a solution ?

12345678
oXX#oooo Eng1
o#XXoooo Eng2

#: Activity Y can not proceed without both Eng1 & Eng2 exist.
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Sat, 2004-10-30 09:10
#4
Billy Hui
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Joined: 23 Oct 2004
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Thanks for Erik’s reply.

Let’s further consider an example.

Activity Y is resource dependent and needs resources Eng1
and Eng2. And this activity needs 5 days to complete the
activity. Eng1 would not be available on day 2 & 3 and Eng2 would not be available on day 3 & 4. As a result, the original duration of the activity would change to 7 days after scheduling. The following figure would show the situation. X means holiday and both resources will work 5 days to complete the activity.

1234567
-XX---- Eng1
--XX--- Eng2

How can I get 8 days as a solution ?

12345678
-XX#---- Eng1
-#XX---- Eng2

#: Activity Y can not proceed without both Eng1 & Eng2 exist.
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Sat, 2004-10-30 01:37
#5
Erik Jonker
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Hi Billy,

For holidays/ Rain days use your calender.
If a breakdown is your whole plant, you can use your calender.

If an interuption is only specific to a activity/ group of activities, I do the following:

Create an activity describing the breakdown. Link it with a FF and a lag equal to the successor remaining duration.

This should clearly indicate the delays.

Cheers
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Mon, 2004-10-25 23:12
#6
Billy Hui
User offline. Last seen 18 years 28 weeks ago. Offline
Joined: 23 Oct 2004
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Maybe I ask in another way.

Would anyone give me some ideas on "Operational interruptions can be modeled using resource calendars or probability distributions for productive hours/day, depending on weather patterns" ?


Best regards,

Billy
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