Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


Definition of Nozzle

Definition of Nozzle

Definition of Nozzle

Good day

I did a project to remove the flange from discharge nozzle underneath the LPG horizontal Vessel, discharge was welded directly. Now the first flange is located 6m away from the vessel. Please anyone clarify whether long pipe has to be consider as a integral part of the vessel (long nozzle) or after first weld it has to consider as discharge pipe?
Does it defined in ASME VIII or API?
Please help me.

RE: Definition of Nozzle

The nozzle detail of the vessel should be shown on the vendor's drawing and may be specified on the U-1 form.

RE: Definition of Nozzle

ASME Section VIII Division 1 clause U-1(e)(1) defines the limits of the Code. In sub-clause (-c) it says the face of the first flange as you discuss above, but sub-clause (-a) allows the first circumferential weld joint.

Thus you could choose that the pressure vessel ends at the first circumferential weld, but that will mean the remaining 6m of pipe will have to meet the applicable piping code. For new construction this could result in some conflicting NDE or pressure testing requirements that might make removing this flange more trouble than it's worth. If this is an alteration to an existing vessel then you'll have to figure out the consequence of having to meet two codes.

You also asked about API, even though that wouldn't seem applicable to your vessel. API 650 clause 1.2 has similar limits (i.e. first flange or circumferential joint).

RE: Definition of Nozzle

Check the nameplate of the vessel to determine the code used in its construction. I am certain that it is an ASME tank therefore, there should be a National Board number. Before you engage in altering this pressure vessel, make sure that you comply with the provisions within the National Board Inspection Code (NBIC) requiring 1)the submition of form R-1 to document the alteration, 2) qualified welders 3)pressure test 4) conformance of material to the applicable section of the ASME Code. NBIC will detail all those requiremnts plus others.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - The Criticality of the E/E Architecture
Modern vehicles are highly sophisticated systems incorporating electrical, electronic, software and mechanical components. Mechanical systems are giving way to advanced software and electronic devices, driving automakers to innovate and differentiate their vehicles via the electric and electronic (E/E) architecture. As the pace of change accelerates, automotive companies need to evolve their development processes to deliver and maximize the value of these architectures. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
Modern cars, trucks, and other vehicles feature an ever-increasing number of sophisticated electrical and electronic features, placing a larger burden on the wiring harness that enables these new features. As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - Modeling and Optimizing Wire Harness Costs for Variation Complexity
This paper will focus on the quantification of the complexity related costs in harness variations in order to model them, allowing automated algorithms to optimize for these costs. A number of real world examples will be provided as well. Since no two businesses are alike, it is the aim of this paper to provide the foundational knowledge and methodology so the reader can assess their own business to model how variation complexity costs affect their business. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close