×
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

Nozzle wall thickness UG-45

Nozzle wall thickness UG-45

Nozzle wall thickness UG-45

(OP)
DATA: Int Pres P=.03 kg/mm2.g
Ext Pres Pe=0.046 kg/mm2.g
Nozzle 4in SCH 40 ID 102.26 mm, thickness 6.02 mm
Design Temp = 100 deg celcius.
Allowable stress for both shell and nozzle = 11.64 kg/mm2.g

Now as per UG-45 ASME,

ta=0.1319 mm
tb1=1.57mm
tb2=8.6 mm
tb3=5.27mm (from TABLE UG-45, for NPS 4)

now, tb=min[tb3, max(tb1,tb2)]
=min[5.27,max(1.57,8.6)]
tb=5.27 mm

tUG-45 = max(ta,tb)
=max(0.1319,5.27)
=5.27mm

But,as in appendix L-7.2.3.4,

This thickness should be less than the minimum thickness provided of 0.875*6.02 = 5.2675.

Since tUG-45 is slightly larger than 5.2675mm, is the thickness considered 6.02mm is passing the code or not? is it necessary to follow the last step given in red color? Please tell me if any mistakes in procedure?

RE: Nozzle wall thickness UG-45

If corrosion allowance is zero then yes, I think the 6.02mm thickness is OK, if corrosion is larger than zero then you shall use a larger thickness.

Take a look into thicknesses shown on Table UG-45 you will see that all correspond to SCH Std. times 0.875 the mill tolerance for pipe. Hence for 4in pipe nominal thickness is 6.02mm then 6.02*0.875=5.2675mm and rounded to 2 decimals will give 5.27mm.

You shall make sure about the value of allowable corrosion.

Hope this helps.

RE: Nozzle wall thickness UG-45

(OP)
Thanks @Jano6924..

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