×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Loss of ejector steam in vacuum tower

Loss of ejector steam in vacuum tower

Loss of ejector steam in vacuum tower

(OP)
I´m working in a review of some PSV´s and I have some doubts regarding vacuum tower protection.

When loss of ejector steam happens vacuum is lost. Should I consider that as there is no vacuum, no flash will occur?  Therefore, is the any need for a PSV as tower will get pressurized slightly over atm. pressure and MAWP is bigger than that? Is this correct?

In general, Do vacuum towers in refineries have PSV´s?

Thanks in advance

RE: Loss of ejector steam in vacuum tower

You need to look at the feed to the vacuum flasher from its charge furnce.  As a first pass, check to see at normal furnace outlet temperatures if (at the MAWP of the vacuum flasher) the feed to the flasher below its bubblepoint?  If so, you can argue that the light ends will build up in the flasher upon loss of ejector steam until the system pressure equals the vapor pressure of the feed leaving the furnace and then there is no more vapor released to further increase the pressure.  Thus, not a PSV sizing case.  If at the MAWP of the flasher you still have vapor formed, the amount of vapor formed at the MAWP (unless you can take credit for other paths out of the system) would be the basis for sizing the PSV.


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


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. 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