I suspect there are many books in effect talking about "rules of thumb" (I think
another one having to do with piping is from American Society of Civil Engineers
(ASCE), see abstract for "Pipeline Rules of Thumb Handbook - Fifth Edition" at
<a href="https://www.asce.org/bookstore/book.cfm?book=4182">https://www.asce.org/bookstore/book.cfm?book=4182</a>). As this book is in its
fifth printing, this perhaps means it has either been some popular, or revisions
are necessary or desirable as some of the "rules" may change?
As far as where this phrase came from, I do not know but I think that the thumb
has probably been a rather convenient unit of measurement for thousands of
years. In our measurement system, I believe the width of a thumb is roughly
about one inch, and thumbs are also held up for some reason out in front of some
folks faces (photographers or videographers?), I guess in some fashion to sort
of relatively "size up" situations. I have always had the impression rule of
thumb sort of means that some of these (rules) may be sort of rough
(measurements or calculations etc.), or sort of derived more from experience
than rigorous scientific knowledge or determinations/research, but like you I
will await certainly more expert lexicography.
Randy Conner
-----Original Message-----
From: <a href="/group/PipingDesign/post?postID=ScsHQS15jlfzJl7qn5mnEKYIJRiaKSyysodbzuZWz9C0RlOF1sKENna6gwqHD_lYraJlxcc6Q640zfqUG2SVfuGhHA">PipingDesign@yahoogroups.com</a>
[mailto:PipingDesign@yahoogroups.com]On Behalf Of Jijoy
Sent: Thursday, July 21, 2005 1:05 AM
To: <a href="/group/PipingDesign/post?postID=ScsHQS15jlfzJl7qn5mnEKYIJRiaKSyysodbzuZWz9C0RlOF1sKENna6gwqHD_lYraJlxcc6Q640zfqUG2SVfuGhHA">PipingDesign@yahoogroups.com</a>
Subject: Re: [PipingDesign] Selection of flange
Dear Elie,
Thanks for the rules of thumb.
Are there any piping rules of thumb ?
Thanks for your answer
Cheers
It sounded like the vessel already has a flange; if so, why couldn't you get
the information on the flange.
Do you know the ANSI rating of the flange or the MAOP of the vessel?
Is the vessel carbon steel?
Is the fluid caustic?
My rules of thumb are:
For cast iron flange, I use flat face with spiral wound gasket
For carbon steel, ANSI 150-300- or 600 LB (MAOP of 285-740-&1440 psig), I
use raise face with spiral wound gasket
For carbon steel, ANSI 900 and higher, I definitely will use RTJ flange
Anyone knows where the expression "rules of thumb" came from?
Cheers,
JP <jijoy@mis.co.ae> wrote:
Dear all,
Could anyone of u answer the following query :
There is a nozzle in a Vessel (which is a closed drain sump). I have to
select a flange for the nozzle and the piping to follow.
How will I select the type of flange whether ring, RF etc..
The nozzles sizes are 2", 4", 6", 8". Based on the selection of flange I will
also have to order the bolts.
The bolt sizes can be obtaibed fron B16.5.
Can anyone tell me how to selectthe type of flange to be used.
Thanks in advance
Jijoy
[Non-text portions of this message have been removed]
SPONSORED LINKS
Mechanical engineering Mechanical engineering jobs Cad drafter Process piping
Mechanical
To unsubscribe from this group, send an email to:
<a href="/group/PipingDesign/post?postID=JK0Jvw2rjWcbsMKa4gLzx4zujncfE8LHgd5wVT8GWcOQtWCKXe4tHnnGwd4oeyQLaT_OSYwr-DsTlxqzPdGv-6MDx6v17CkZmECvnl4Q">PipingDesign-unsubscribe@yahoogroups.com</a>
Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
SPONSORED LINKS Mechanical engineering Mechanical engineering jobs Cad
drafter
Process piping Mechanical
YAHOO! GROUPS LINKS
a.. Visit your group "PipingDesign" on the web.
b.. To unsubscribe from this group, send an email to:
<a href="/group/PipingDesign/post?postID=JK0Jvw2rjWcbsMKa4gLzx4zujncfE8LHgd5wVT8GWcOQtWCKXe4tHnnGwd4oeyQLaT_OSYwr-DsTlxqzPdGv-6MDx6v17CkZmECvnl4Q">PipingDesign-unsubscribe@yahoogroups.com</a>
c.. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
[Non-text portions of this message have been removed]
Yahoo! Groups Links
_________Confidentiality Notice_______________________This e-mail and any files transmitted with it is confidential and is intended solely for the use of the individual(s) or entity(ies) to whom this e-mail is addressed. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be advised that you have received this e-mail in error, and that any use, disclosure, dissemination, forwarding, printing, retention or copying of this e-mail is strictly prohibited. If you have received this e-mail in error, please immediately return this e-mail to the sender and delete the e-mail from your system. Thank you. Received on Thu Jul 21 10:27:00 2005
This archive was generated by hypermail 2.1.8 : Tue Mar 04 2008 - 11:40:42 EST