×
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

Opening in a blind flange

Opening in a blind flange

Opening in a blind flange

(OP)
Hello, there:

My question is:
An existing 18" line (Sch. 10. A53 Gr. B, class 150 flange rating, operating 300 psig and 200F) ended with a blind flange. A proposal is to open a hole in the blind flange (during shut down time) and connect to a 8" pipe line.

Please help, which code should follow to check whether this opening is safe from stress point of view?

Your advice is appreciate


 

RE: Opening in a blind flange

Please RUN.

Class 150 flanges (Group 1.1) are rated for a maximum of 285 PSI at 100F and 260 PSI at 200F.

Please check the piping code you are using as to the method for calculating that opening.  Table 6 (or F6) in ASME B16.5 lists the size of opening that can be put in a blind flange without changing to a hubbed reducing flange.

EJL

RE: Opening in a blind flange

To expand a bit on eliebl's posting, is the 300 PSIG @ 200*F the operating point, or the safety/relief valve setting? If you're not using the safety/relief valve setting, then it's just that much worse.

RE: Opening in a blind flange

........also, read ASME B31.3, paragraphs 304.4 (including its sub-paragraphs) and 304.5.  This will take you to ASME B&PV Code, UG-34..  You should really consider using a B16.9 reducer.

Regards, John.

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