ANSI B16.1 RFWN??? Very confused

[BigTank]

I spec'ed and ordered an ASME B16.47 Series A 36" 150# RFWN flange, and received what appears to be an ANSI B16.1.

I cannot confirm this as I am unable to find the dimension chart I found on Friday for a B16.1 36" 150# RFWN. I am almost sure I found this chart, but now all I can find is a chart for a B16.1 36" 125# RFWN flange, or 150# class flanges under 24" nom.

The problem is that this flange is welded as a body flange in a vessel, and in attempting to locate nozzles, we discovered that the flange is built to the incorrect standard. We now need to re-run the calcs to see if we need to cut this flange off and replace it with the correct one.

The stamp on the flange simply says 'B16', and then has the other required data in some order (size, A-105, etc.)

To summarize, I suppose I'm a bit confused about this standard. Can someone give me some info on the B16.1 flanges? I.E. Dimensions, available classes, and anything else you know about them?

Fitter, happier, more productive

 

[nickelkid]

B16.1 covers Classes 25, 125, and 250 Cast Iron(ASTM A 126) flanges and flanged fittings.

 

[BigTank]

Thanks Handy. Do you know if this particular code is still active?

--------------------------------
Fitter, happier, more productive

 

[nickelkid]

Yes it is active, latest release is 2005.

 

[IVNJ]

Sounds like you might have received a Class 125 A105 flange.
Go to

http://www.boltex.com

to see dimensional specs.

 

[BigTank]

If they are Class 125, they are stamped wrong. They are stamped as 150# class.



--------------------------------
Fitter, happier, more productive

 

[IVNJ]

A B61.1 Cast Iron flange has the same bolt circle diameter, same size and number of bolt holes and the same flange thickness as B16.47 Series A. But, your flange is only marked B16, so no telling what you actually have.

 

[BigTank]

The flange thickness isn't the same, but you're right about the bolt holes:

http://www.texasflange.com/Catalog.pdf

P.28, col. C

http://www.texasflange.com/Catalog.pdf

P.15, col. C

The difference is 1.185".

The 'certification of inspection and test' tells me it's ANSI 16.1. I guess I left that part out. Sorry guys.

--------------------------------
Fitter, happier, more productive

 

[TenPenny]

Does this help?

http://www.steel-flange.com/ASME-B16.47-SeriesA-MSS-SP-44-Flanges-Class-150lbs.pdf

 

[BigTank]

The link, she no works.

--------------------------------
Fitter, happier, more productive

 

[TenPenny]

It works for me, but if not, go to

http://www.steel-flange.com,

there is a list of links to the ANSI dimensions.

 

[rconner]

Irrespective of marking issues, if you ordered a steel flange to ANSI B16.47 and instead/in fact got a B16.1 cast iron flange, it would appear to me you have not gotten what you ordered. However, are you very sure the flange is cast iron (and not e.g. a steel flange that the vendor or fabricator furnished and with a sort of generic B16.*.* marking scheme, perhaps intended somehow to satisfy availability/multiple ANSI standards requirements for various steel flanges)?

If it is in fact/instead steel, and not B16.1, I am not familiar enough with all specifications and codes to answer a followup question of whether such a generic or blanket marking scheme, if that is the case, satisfies the specific marking standards of all codes etc.

 

[BigTank]

rconner: my sentiments exactly. we did not get what was ordered. the matter of payment seems to be a different matter entirely as the cost on the T&M report doesn't match the quoted price of the B16.47 flanges. if it were up to me, i'd be reading the riot act to our vendor, but that's not my duty.

aside, the flange IS indeed A-105/SA-105, and not cast iron. it is built to the ANSI B16.1 dimensions, but definitely forged and stamped with a 150# rating.

very curious mess, indeed. the vendor has been notified, and is supposedly trying to figure what and how it happened. meanwhile, that portion of the vessel is waiting for a resolution...

tick tock tick tock....

--------------------------------
Fitter, happier, more productive

 

[unclesyd]

Here are some dimensions of various flavors of large diameter flanges.

http://www.pacificflange.com/catalog.html

 

[BigTank]

By the way, thank everyone for their help with this ANSI code of which I am not well versed. I'm learning an awful lot awfully quick, as is the norm i suppose.

I'm still looking for answers...does anyone think it possible that the markings required by this standard are different from the actual flange rating to keep consistent with other standards? In other words, the flange is rated 125# by the ANSI B16.1 code, to which this flange conforms dimensionally, but it may be marked 150# as this rating is more common?

Or...another scenario...could the flange be built dimensionally to the ANSI B16.1 standard, but built from forged steel per ANSI A-105, and thus the class rating increased to 150#? That sounds to me like they'd be stepping into a different standard altogether with the material change, but I could be wrong.

--------------------------------
Fitter, happier, more productive

 

[BigTank]

nice link unclesyd! very concise...right there in front of you. thanks for the resource! (but i've found this information already)

--------------------------------
Fitter, happier, more productive