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Flange Schedule

08/04/2010 9:12 AM

Do we need to specify the schedule for all the types of flanges? Is it true that we don't need to mention the schedule of a slip-on flange?

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#1

Re: Flange schedule

08/04/2010 9:26 AM

It depends upon what is on the P&ID, which is the lead document as regards plant design:

  • If the piping spec is referenced on the line label on the P&ID, then no, the flange schedule needs no attention as it will be in the appropriate accompanying piping standard.
  • If the piping standard is not referenced on the P&ID though it is on the line schedule, then the same applies.
  • If there is no refderence to the piping specification on either the P&ID or the line schedule then maybe one might indeed write a pipe flange schedule, though the other two methods above will save an awful lot of work, re-work and reduce the possibility of errors in so doing.
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#2

Re: Flange Schedule

08/04/2010 9:58 AM

10 inch nominal pipe of shedule 10 or schedule 160 has the same OD, so the flange will "slip" on just the same. Make sure you get the flange rating right though.

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#3

Re: Flange Schedule

08/04/2010 11:55 AM

Flanges are rated in working pressure (150#, 300#, etc.) and would thus match or exceed system pressure.

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#4

Re: Flange Schedule

08/04/2010 12:32 PM

It is highly advisable to specify the schedule of the flange. Since based on it, not only the basic temparature pressure ratings but also the bolt hole sizes, numbers and PCD will be defined.

In case one of the flanges require replacement/to be fixed by some one else, then the whole lot of exercise can be avoided if you use a standard scheduled flange.

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#5

Re: Flange Schedule

08/04/2010 1:57 PM

You are getting lots of answers but I fear there is something missing from the question and the answers.

My recommendation is this:

Flanges are Identified by "Class" as in Class 150. Class 300, Class 600, etc. This takes care of the proper matching of two flanges of the same Class.

But, with Weld-Neck Flanges (especially in the higher Classes) when you order them from a Vendor you should always specify both the Class and the Schedule (of the attached Pipe) Example: Quantity=120 - 8" Class 600 (Sch 160) Raised Face Weld Neck, Carbon Steel Flange, ASTM etc, etc,

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#6
In reply to #5

Re: Flange Schedule

08/04/2010 8:35 PM

PennPiper gives a true and complete answer

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#8
In reply to #6

Re: Flange Schedule

08/05/2010 3:18 PM

MJCronin are you the same MJCronin who attends "Meetings of the Bored" ?

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#10
In reply to #8

Re: Flange Schedule

08/07/2010 7:18 PM

RoadApple.....yes I am... Why ?

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#12
In reply to #10

Re: Flange Schedule

08/08/2010 12:37 PM

Because I also attend these "VESPERS" as Mr. Breen would say.

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Commentator

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#7
In reply to #5

Re: Flange Schedule

08/05/2010 10:17 AM

You should specify schedule also when ordering Socket Weld Flanges.

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Active Contributor

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#9

Re: Flange Schedule

08/06/2010 8:04 PM

Do we need to specify the schedule for all the types of flanges? not
Is it true that we don't need to mention the schedule of a slip-on flange? not

Alberto

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#11
In reply to #9

Re: Flange Schedule

08/08/2010 7:50 AM

Alberto, you manner of answering is a bit confusing.

Please consider this.

You need to specify the wall schedule of the connecting pipe for all flanges except:

  • Threaded Flanges
  • Slip-On Flanges
  • Van Stone Flanges
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#13

Re: Flange Schedule

08/08/2010 1:21 PM

Pennpiper

I am sorry , for the short answer,…… BUT IT WAS CORRECT……

I believe that THE CONFUSED QUESTION and it would should you restate it again

but I insist in

- it i not necessary the Sch of the pipe to defines the series of the flange

- The OD of the pipes anyone is the Sch it is same

- The serious flanges 150, 300#, it is same the OD

For the question N#1, IT IS NOT NECESSARY to KNOW THE SCH to SELECT THE FLANGE

For the question N#2, IT IS NOT NECESSARY FOR ANY TYPE OF FLANGE

Threaded Flanges

Slip-On Flanges

Weld neck Flanges

Socket weld flanges

Lap joint

Greetings to all

Alberto Galindo

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#14
In reply to #13

Re: Flange Schedule

08/08/2010 1:44 PM

Alberto,

I can only hope that somewhere, sometime in the future you and I could have a face to face conversation about this subject and we could come to a better understanding about why we each think we are right.

Best wishes

PennPiper

aka Jop on the www.pipingdesigners.com forum

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Anonymous Poster
#15
In reply to #14

Re: Flange Schedule

08/09/2010 10:03 AM

When ordering a flange, we must specify the type of flange, rating and schedule especially on weld neck type. The pipe and flange schedule should be matched to avoid offset in internal of jointed connection.

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alberto galindo (1); Anonymous Poster (3); Kaisan (1); mareng (1); Mechanicalmark (1); MJCronin (2); PennPiper (3); PWSlack (1); roadapple (2)

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