Is this a requirement??

[BOPman]

I have a hemispherical head with a cast nipple 1.25" in diameter and 1.50" long. The first .75" of the nipple is threaded with a 1.25" thread. The remaining .75" of length is straight 1.25" OD.

I was told that the straight OD on the nipple needs to be 1.38" OD and the length of the straight OD needs to be at least 1" long. I inquired as to why, and I was told that there is a minimum requirement in ASME in regards to this.

Could someone possibly quote me the paragraph in section UW-16 that would apply to this instance?? I don't believe ASME has minimum requirements on nozzles or openings until you reach 3" in diameter.

 

[deanc]

Cast Nipple?

Need more info. and talk to your AIA....change coming to UW-16.

 

[MJCronin]

BOP..

Wow.... what materials are used in the head and nipple ?

Is this cast iron ?

-MJC

 

[BOPman]

After some searching, the only thing I can come up with is that he is mistaking it for a flued opening. But it clearly states that there is no minimum requirements for a flued out opening under 6" in diameter.

BTW, yes it is a cast nipple. The "vessel" is actually a pulsation dampener that is only about 15" OD. But it operates at a constant 2000psi, so it is a pressure vessel. We cast it out of SA-352-LCB material (17,500psi min. yield.)

The real reason I am inquiring about this is that the "engineer" in charge was about halfway through this project and was using a non-coded material. Castings made and material being poured. Personally, I don't think this guy knows his a$$hole from his earhole.

 

[metengr]

The real reason I am inquiring about this is that the "engineer" in charge was about halfway through this project and was using a non-coded material. Castings made and material being poured. Personally, I don't think this guy knows his a$$hole from his earhole.

Yes, indeed. You got my vote on the above as well.