×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

standarizing nozzle loads for vessels

standarizing nozzle loads for vessels

standarizing nozzle loads for vessels

(OP)
Hi all,

We are a pressure vessel manufacturing company, I want to standardize the nozzle loads for our steam drums for a range of pressure and temperatures.
Can you guys please tell me what is the procedure to standarize the nozzle allowable loads for the nozzles of a vessel so that when piping team designs piping they can use those allowable loads and do the piping at their end.
 

RE: standarizing nozzle loads for vessels

Pressure vessel design codes don't normally address this. Most lists of allowable nozzle loads originate from design or construction companies. An exception is Norsok Standard R-001, available free from Norsok's website. It has equations limiting loads according to size and pressure class, but does not consider temperature. Look at section 5.1.5 in the 1997 edition.

 

RE: standarizing nozzle loads for vessels

It may be too difficult to standardise the nozzle loads on the drums due to the variations on the pressure (LP, HP drums) and thicknesses. Mainly LP drums are the most disadventages due to the less thickness.
 
If HP drum thickness was selected for the tube efficiencies you may not have too much problem in getting the piping loads by the shell wall if you select the location of the nozzle on the untubed side.

In case the HP drum wall thickness was welected for internal pressure only (no tubing), you may need to assume some pre-loads and check by calculation (WRC 297, PD5500 or FE-Pipe),and assign the acceptable & reasonable loads to the piping section.

Mainly the drum nozzle acceptable loads are very limited, and pipe should have sufficient flexibility.

Most of the large nozzle loads come from the inproper pipe/tube arrangement. I guess working on that side will eliminate large loads on the nozzles.

Ibrahim Demir

 

RE: standarizing nozzle loads for vessels

I would like to add the variation on the materials and their properties as well for the drum construction.

Ibrahim Demir

RE: standarizing nozzle loads for vessels

API 662 gives a method for assigning loads for general and severe duty based on nozzle diameters.  You may find this useful.  I've used it in the past when customers ask for loads but do not know what they want.  
TEMA says that laods will be assumed at zero for design unless the customer gives us values.   

RE: standarizing nozzle loads for vessels

mahsud44, HEI Standards for Powerplant Heat Exchanges contains a simplified method for finding the allowable resultant moment and shear load for a given geometry and material.

Practically speaking it is of little use, but it might meet your needs.

Nozzle loads can (and usually do) consist of three loads and three moments applied simultaneously, see WRC 107 for example, and you can only evaluate particular load cases, not determine allowables.

Regards,

Mike

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!


Resources