Welcome, Guest
Username: Password: Remember me

TOPIC: What is the connection between P&ID, Line Lists & Isometrics

6 years 8 months ago #8307

  • anushbabin
  • anushbabin's Avatar
  • Offline
  • New Member
  • Posts: 5
  • Karma: 0
Can you please educate me and help me to understand:
What is the connection between P&ID, Line Lists & Isometrics?
Can I tracenumber of isometrics to be issued in Line List ?
What is ratio of Isometrics per Line Lists per P&ID? (or any other standart ratios?)
What are top influencers on number of Isometrics required to be issued?
Can it be possible be that number of Isometrics required for the project are inflated? Why it may happen?
Do we need to test run PDMS to confirm number of Isometrics?
Thank you in advance!

Re: What is the connection between P&ID, Line Lists & Isomet 5 years 7 months ago #7122

  • garzabla
  • garzabla's Avatar
  • Offline
  • New Member
  • Posts: 5
  • Karma: 0
There is no connection between the P&ID/Line List & Isometrics
Therefor the answer to nearly all of your other questions is No

The only way to estimate the total number of Iso's required is to apply an average of 2 to 3 Iso's per line number but this will only be a rough initial estimate. If you feel your estimate is inflated that is why. There is no way of knowing the exact number until the isometric extraction is finished.

PDMS does not determine the number of Iso's, that is the job of the Piping Designer

Re: What is the connection between P&ID, Line Lists & Isomet 5 years 7 months ago #7123

  • knives
  • knives's Avatar
  • Offline
  • Junior Member
  • Posts: 26
  • Thank you received: 1
  • Karma: 0
-Line list is developed using P&ID.
-Iso drawing containing process data should be consistent with line list and P&ID.
-A high level estimate of multiplying the unique line no. found in line list to a factor of 1.4 to 1.5 would give you the rough quantity of isometric drawings.
-Be aware of the quantity of equipment trims which could inflate your iso drawing count and for some reason, some iso drawing need to be produced with suffix added on the main line no. sequence.

Re: What is the connection between P&ID, Line Lists & Isomet 5 years 7 months ago #7126

  • 11echo
  • 11echo's Avatar
  • Offline
  • Platinum Member
  • Posts: 351
  • Thank you received: 5
  • Karma: 1
garzabla ... “There is no connection between the P&ID/Line List & Isometrics Therefor the answer to nearly all of your other questions is No”
OH My Brother … Did you run across a bad bottle of “Canadian Mist” or what!!?? It <strong>ALL </strong>connects together in one form or another!

anushbabin
What is the connection between P&ID, Line Lists & Isometrics? … A Line Lists is/are where you get the individual line number(s) for every line indicates in the P&ID. This is either for a “new” just routed line, or for the “history” of an existing line.

Can I trace the number of isometrics to be issued in Line List ? …This answer is NO, usually the number of Isometrics drawings is dictated by the length/configuration of the line. SO you need some idea what that particular line looks like physical.

What is ratio of Isometrics per Line Lists per P&ID? (or any other standard ratios?) …You will have (at minimum) one isometric drawing per line number, so if your line list has 300 line numbers then 300 isometric drawing is the minimum estimate, but as I had indicated the number of drawing sheets is dictated by the length and/or configuration of each individual line. So a fair number of those line numbers will require 2 or 3 sheets! Remember every line number will be indicated on the P&ID but there is no indicating factor that dictates how many isometric drawing what will be needed from a P&ID …a line on a P&ID could be 2 feet long or 200 feet long …looking at the P&ID you couldn’t tell. So to answer your last question here, there is NO “standard ratios”!

What are top influencers on number of Isometrics required to be issued?
…Again Length and configuration ARE the determining factors as to how many isometric drawings you will have! You could fit a 30 or 50 foot piping configuration on a single drawing, but what if the length of the line is 150 foot? …so maybe 3 drawings? …and that’s “IF” the configuration isn’t too busy! …Experience is the only good way to play this estimating “game”! ...(That and a good "piping transposition" drawing!)

Can it be possible that the number of Isometrics required for the project is inflated? Why would it happen? …It could be possible that the number of isometrics could be inflated, and for a number of reasons! They range from the “fraud” to just plain “bad estimating”, however it is rare that only one person does and estimate of a job, and not have a number of “other people” looking at that estimate and either agreeing or disagreeing with it! So the job of estimating is not the responsibility of just one person …all though it normally starts with just one person and I’m sure that person doesn’t want to look “foolish”.

Do we need to test run PDMS to confirm number of Isometrics? …You can, but to be accurate this would have to happen towards the end of the project and normally estimates are required at the beginning.

Re: What is the connection between P&ID, Line Lists & Isomet 5 years 6 months ago #7128

  • garzabla
  • garzabla's Avatar
  • Offline
  • New Member
  • Posts: 5
  • Karma: 0
Bad Canadian Mist ?? Why the sarcasm?

Re: What is the connection between P&ID, Line Lists & Isomet 5 years 6 months ago #7129

  • 11echo
  • 11echo's Avatar
  • Offline
  • Platinum Member
  • Posts: 351
  • Thank you received: 5
  • Karma: 1
Just poking fun, anybody in this business as long as we have, it's the one thing that makes the job tolerable at times, hope I didn't hurt your feelings!??
Moderators: Jop
Time to create page: 0.487 seconds

 

 

Latest Jobs Feed

Feed not found.

Company News Feeds

Company News Feeds

Login Form

You are not logged in.

Search

}());