Using eblow for Nozzle connection
Using eblow for Nozzle connection
(OP)
Hello all,
I am working on a Pressure vessel designed to ASME Sec 8 Div. 1 Code with design pressure of 120 barg.
The Vessel dia. is 1050mm and it has an ellipoidal head at top.
Piping configuration requires that the projection of nozzle at the centre of top head be kept to a minimum, and Piping enginner asked me to consider a 90-elbow welded directly to the head (without any nozzle neck in between the head and elbow).
I am not sure if this configuration (i.e. using elbow for nozzle neck) is acceptable as per Code or not.It is also unclear as to how can we comply with Code opening reinforcement requirements.
Has anybody come across this before?
Kindly share your thoughts whether this is an acceptable solution?
Thanks for your kind advice ....
D2HANDLE
I am working on a Pressure vessel designed to ASME Sec 8 Div. 1 Code with design pressure of 120 barg.
The Vessel dia. is 1050mm and it has an ellipoidal head at top.
Piping configuration requires that the projection of nozzle at the centre of top head be kept to a minimum, and Piping enginner asked me to consider a 90-elbow welded directly to the head (without any nozzle neck in between the head and elbow).
I am not sure if this configuration (i.e. using elbow for nozzle neck) is acceptable as per Code or not.It is also unclear as to how can we comply with Code opening reinforcement requirements.
Has anybody come across this before?
Kindly share your thoughts whether this is an acceptable solution?
Thanks for your kind advice ....
D2HANDLE





RE: Using eblow for Nozzle connection
Don't you need a reinforcement ring on the nozzle?
RE: Using eblow for Nozzle connection
RE: Using eblow for Nozzle connection
As for reinforcement, you should restrict the limit of reinforcement along the nozzle wall (perp to the head) perhaps even setting it to zero, i.e. no contribution from the nozzle. This of course will require more contribution from the head.
I agree w/ europipe, use a pup if you can.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Using eblow for Nozzle connection
RE: Using eblow for Nozzle connection
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Using eblow for Nozzle connection
RE: Using eblow for Nozzle connection
Hope this helps.
RE: Using eblow for Nozzle connection
Regards
r6155
RE: Using eblow for Nozzle connection
RE: Using eblow for Nozzle connection
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Using eblow for Nozzle connection
D2 are you still there?
RE: Using eblow for Nozzle connection
You need a straight length of pipe to fit through the drilled/machined hole. Then this straight length of pipe is welded inside and out to the PV walls with a conventional fillet weld. With extra reinforcement, depending on the diameter and the pressures.
An elbow, however, DOES have a only a very short "near straight" tangent length that CAN fit through a drilled hole in a PV wall, but only if the PV wall is relatively thin. Get more than a 3/4 inch thick wall, and the elbow will no longer fit in the drilled hole. You need to scarf out the wall to get the elbow intrados to fit, and weld up (butter) the extrados to reduce the gap between elbow wall and PV wall.
BOTH the extra grinding and the weld buttering CAN be done, but either plan for the grinding and field fit "machining with a Metabo", or pretend it will work as-drawn and let your shop foreman do what he sees best.
RE: Using eblow for Nozzle connection
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Using eblow for Nozzle connection
Thanks a lot for the great posts and your valuable insights...
Well...to be frank , i am yet to check the reinforcement requirements..
I also do agree..nozzle neck is a must between the elbow and head..and that is the way i have seen the nozzles all of my life..But the Piping guy says he is in a very tight spot and needs me to bail him out...
Thanks a lot for your idea r61555, but the Client specification does not allow to apply internal reinforcement pad due to potential corrosion issues...
Thanks europipe..i think you've got a point ..will ask the Piper to consider this approcah..
I was out of the network...over the weekend..
Thanks for the idea...but unfortunately again...the Client spec needs a minimum for 38mm for straight face on the head...there is no escape..
Racookpe...you deserve a big thank you for the "real world" explanation..as an EPC engineer never thought of those...
Btw. the vessel head in question is just 20mm thick...
Thanks a lot to all members who took out the time and energy to read and post a reply ..really appreciate...
D2HANDLE