Hello ALL,
I am not an experience engineer but would like to have
a suggession for this one...
Now as Mr.Davis want to know " Why DO they call it a
"Class 150" flange? "
I hope my sugession would answer the obvious query
that any person would have after knowing that flanges
are known by ratings like 150#,300# etc but dont know
from where the number 150 , 300, 600 generated..
If u go through the press-temp rating table u will
find that max allowable pressure for all ratings
flanges are mentioned in bars. for particular temp..so
if u see the column of 150# rating with corresponding
allowable pressure (bars) at softning temp and if u
convert that pressure from bars to PSI u will be
definetly go near by 150 and same is the case with
other ratings 300, 600. just convert the pressure to
PSI at the softening point and u get the rating of the
flange...so find it out and see if its the same ? i
think great professional & experience persons agrees
to it or suggest if there another answer to it..
Regards,
Trainee Engineer ..
(India)
- DAVIS MCCONNICO <tz2@msn.com> wrote:
> Ok, all you pipe nerds.
>
> Here's a dumb question.
>
> I'm not an engineer, just a gasket salesman. But I
> enjoy reading this forum
> and have enhanced my knowledge thereof. I've asked
> this for the last few
> weeks to all my engineer customers and no one knows.
>
> Usually when a pipefitter (in the USA) refers to a
> "150 lb. flange" he means
> an ASME B16.5 Class 150 flange. It's amazing how
> many think the "pressure
> rating" of that flange is 150 psig. Obviously,
> that's not the case. It's
> material and temperature dependent. For example, per
> table 2 of B16.5, a 304
> Stainless Class 150 flange has a pressure rating of
> 235 psig AT 200 deg. F.
> But here's my question:
>
> Why DO they call it a "Class 150" flange?
> From whence was the figure "150" derived?
>
> It's not the weight! It's not the pressure rating!
> I've even run some
> numbers from table 2 and it doesn't even seem to be
> the AVERAGE! (I ran an
> average on the table for the 4 material groups of
> carbon steel, which is the
> highest pressure rated group: 130 psig)
>
> Here's hoping someone can clear up a long-standing
> and nagging question.
>
>
> -Davis
>
>
> Thermoseal Contact Information
> Area Representative:
> Davis McConnico
> South East District Manager
> Thermoseal Inc.
> Pensacola, FL. 32504
> voice: 850 / 477-0960
> fax: 850 / 477-0106
> email: dmcconnico@thermosealinc.com
>
>
>
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Received on Mon May 10 10:27:00 2004