What do you consider when setting the length of nozzle projection for a vertical vessel? How much is the distance between the vessel and the face of the nozzle? Thanks everyone!

1). The Nozzle projection is not a normal function of the Piping Department. It is the responsibility of the Vessel Engineers and Designers.

2). I believe the Vessel Department will set the Nozzle projection based on the removal of the Stud Bolt with clearance from the back of the Flange Ring, to the vessel Shell plus any possible insulation.

As a piper I do not remember (It has been a few years) ever setting the Nozzle projection. The Vessel Department pretty much had and used their Standard. I do remember asking for a change in the projection of a few nozzles from time to time but only for special situations.

As a piping designer, we do need to know approximately what the nozzle projections will be on a vessel for initial layout before vendor drawings are available. When these drawings are available, we will verify that the projections are functionally correct.

General projections I've used for 150# and 300# flanges (from outside of vessel to face of flange) are:
2" and under: 6"
3" & 4": 7"
6" & 8": 8"
10" & 12": 9"
14"-18": 10"
20" & 22": 11"
24" - 30": 12"

Thanks Jop and Joel! Yes, this is for layout study. Normally, how much clearance do we need from back of flange to vessel shell for bolt removal? Thanks again!

Bolt length + 1" is a good rule of thumb.

When we do appurtenance dwg.s we put in a nozzle chart where we call out the nozzle projection. This is normally a "wish list" and we let the fabricator dictate the final length. However I use API 650 Std. Table 3-8 sht. 3-19 under column 7 (page 42 of 172), it list a normal nozzle projection which I normally use, seems to be a good list because the fabricator rarely changes my call outs!
http://www.scribd.com/ahmad_sulaeman_1/ ... il-Storage

Following two important things to remember as a PIPER.

Nozzle Projection do not comes under piping scope.

Nozzle orientaion do come under piping.

cj.abhijit ...Following two important things to remember as a PIPER. Nozzle Projection do not comes under piping scope. Nozzle orientation do come under piping.

I have to disagree! Now in large engineering firms where the scope of your work is strictly laid out, this might be true! However in smaller companies where even thought you have a title as a "Piping Designer" ...your scope of work is only limited by your capabilities. I do appurtenance drawings all the time, and I call out nozzle projections! I also do structural & foundation design, I generate rough grading plans, and I have even done some construction coordination. I'm not trying to get "brownie points" here, all I'm trying to indicate that a definition of a “Piping Designer” at one engineering firm, is not necessarily the same at another. AND the biggest error here is trying to hang a blanket job description on what a "Piping Designer" is or is not suppose to do! Best definition I can think of is: …“You do what is required!” ...IMHO

The intention behind is clarifying what to do & what not to as a piper. Piping Engineering such a confusing role that there is always a possibilty that Pipers tend to get involved in the things they are not supposed to do.

Now, if one is got appointed as a piping designer & not as Mechanical / Equipment Engineer or Designer can't take a call on Nozzle projection he is not supposed to do it. (I can understand things are different in small companies but however we are trying to make professional designers out of this forum so we need to take a call if you want to become piper or just keep on struggling with what exactly I supposed to as a piper)

One person / job profile can't do everything on the project even though if you feel that in small companies it is a necessity...as in in above situation from you.

Even though it is felt that to try to do what is required ....we need expertiese for specific job activities & that is why we do multii-disciplined project execution organization structure.

If one can do all the things why need to have all the other engg disciplines on board? (if you feel your point is valid?)

Also refer to the reply from Jop for better understanding.

If you draw a square or box about what you think is the "proper" definition of a piping designer, and the person in that position only knows and does what is defined by that box, they will probably only have a job until the next engineering slow down (about every 10 or so years – my experience), and when the company starts laying people off, the person that can do more then what’s definited by that box will probably still have a job! …And that is true of both large and small engineering companies.