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Guru
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Welding a Nipple to a Blind Flange?

10/11/2012 2:20 PM

Folks,

Anyone know what the appropriate code for attaching a nipple to a blind flange?

I have an 8" blind flange, and I want to know if there is an ASME method for attaching a 2" nipple.

I have been all through ASME B16.5 to no avail.

I am hoping there is someone out there who knows the legal proper way off the top of their heads. (I'm not asking you to do special research, so if you don't know then don't respond.)

Thanks in advance,

-A-

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Guru

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#1

Re: Welding a Nipple to a Blind Flange?

10/11/2012 10:28 PM

I guess you have to attach the nipple and then get a new certificate for the flange.

Is there a code for ported flanges?

Sorry dont know the code, but I think there should not be a code for how things are done but just only how they should look like after being done.

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#2

Re: Welding a Nipple to a Blind Flange?

10/12/2012 1:30 AM

Buy a 2 inch Sock-O-Let fitting, or Weld o let if you want a butt weld, and use this fitting for the joint.

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Commentator

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#3

Re: Welding a Nipple to a Blind Flange?

10/12/2012 8:44 AM

Per B16.5-2009 Table II-6 Reducing Flanges, it is acceptable to make a Reducing Flange from a Blind flange (no hub is required). It should be double fillet welded like a Slip on Flange. However, to meet a specific Code, you may need to procure this as a reducing flange made from a blind from the manufacturer so it has the proper markings.

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Guru
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#4

Re: Welding a Nipple to a Blind Flange?

10/12/2012 9:40 AM

Excellent, thank you, got it.

ASME B16.5-2009 Table 11-6

Nominal pipe size 8

3" and larger connection requires a hub flange. Under that size a blind flange can be used. Center punched, the 8" flange becomes a giant slip-on flange on the 2" pipe. Double fillet welded.

Thank you CR4 for being exactly what I needed!!

-A-

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