header vs. sub-header

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14 years 6 months ago - 14 years 6 months ago #7648 by Bob
header vs. sub-header was created by Bob
Jop,

In your career, what has been the dividing line (if there IS one) between a "header" and a "sub-header". A process collegue told me that if a lateral branch off of a header was "greater than a certain size" that it would be classified as a "header" and not a "sub-header"... even though it was a lateral branch and not merely a continuation of the original header.

Thanks,
Bob

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14 years 6 months ago - 14 years 6 months ago #5321 by Anton
Replied by Anton on topic Re: header vs. sub-header
Hi Bob,

Does it make a difference, in terms of the actual piping, whether it is called a Header or a Sub Header??

- If you're the smartest person in the room ... you're in the wrong room.

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14 years 6 months ago - 14 years 6 months ago #5322 by Anton
Replied by Anton on topic Re: header vs. sub-header
I just realised, that I responded to a question with a question ......

Allow me to rephrase:

My personal opinion is that there is no difference between a header and a subheader.
Yes, one may be a branch off another, but it still serves the same function.

The only dividing line I see is, that if it's to be considered a continuation rather than a branch, then maybe you need to assign it a new line number.

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14 years 6 months ago - 14 years 6 months ago #5323 by Bob
Replied by Bob on topic Re: header vs. sub-header
Hey Anton,
No... I guess that it really doesn't make a difference in terms of actual piping... it's more of a "tomato" vs. "tuhmahto" thing... but I'd really like to find out what other piping designers' conceptions are.

When there is an actual lateral branch from a header (and the original header continues down the pipe rack, for example) the line number changes, as you say, and is this branch still considered a "header" or is it now a sub-header"?

I know that it may not matter... which is probably why I'm so OBSESSED with it (smiling)...

Bob

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14 years 6 months ago - 14 years 6 months ago #5324 by Anton
Replied by Anton on topic Re: header vs. sub-header
In that case I would normally class it as a sub-header .... usually easier to describe in discussion.

Now .... if you have a sub-header off the subheader, is that is a sub-sub-header?

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14 years 6 months ago - 14 years 6 months ago #5328 by Jop
Replied by Jop on topic Re: header vs. sub-header
These terms, Header, Sub-Header, Branch, Lateral, etc are "Context" related terms. It depends when, where and how they are used.
Examples:
(Non-piping)
If your kid is riding his/her bike and falls off and lands on his/her head then "He/she took a Header"

(Piping related)
A. The main steam line in the Interconnecting pipe rack is considered a Header and all the "Branches" feeding process units are called "Sub-Headers" at that point.
B. Within the process unit that Sub-Header Steam line is considered the Unit Main "Header" and connections might be a single use "Branch" or a multi-use "Sub-Header" with many branches.
C. In the Piping Material Line Class Specifications there is normally a document called a "Branch Table". This defines "How" to make different Size-to-Size or one-or-more sizes smaller connections to the side of another pipes. The first pipe here is called the "Branch" and the second is called the "Header".
D. A simple 6" (150mm) line with a PI connection, The line is called a "Header" and the Thread-O-Let, nipple and valve is the "Branch"
E. The term "Lateral" is normally used for Underground piping. In this context it replaces "Sub-Header" and the term used for the "Header is replaced with "Main". (i.e.: Sewer "Main" and sewer "Lateral").
F. For Above ground piping you do have a fitting called a "Lateral" which might be considered a 45 degree TEE. you might also have a "Lateral" Stub-In to a Flare Header.

I am sure others will come up with other examples. But the point I am trying to make is you must remain flexible and recognize that there is not a specific "This" only definition for these terms.

Do it once and Do it Right

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