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

Vapour Pressure of Diesel

Vapour Pressure of Diesel

Vapour Pressure of Diesel

Can anyone help me to find the vapour pressure of diesel fuel? I need it for NPSHA calculations. Does anyone know a good site/resource for this kind of data?

RE: Vapour Pressure of Diesel

What temp and grade fuel?
Grade might be 1, 2, Arctic.

You can find a lot of data on fuels in the first section of the Military Handbook 1022A.  

Do a web search for MIL-HDBK-1022A and download the handbook.

If you can't find it, give the grade and temp and someone will be able to help.

RE: Vapour Pressure of Diesel

You don't give what temperature but I'll assume it's close to ambient, say 100F to be conservative.  Here are two approaches.

Diesel comes off the sidedraw of a crude column with about 400F initial boiling point.  If you correct that to 100F (Nelson has a chart in their book), you'll get under 0.1 psia.

Another estimate is off the flash point.  Diesel has a flash point around 150F.  For most heavier HC, they have an LEL (which is what the flash point corresponds to) of about 1 to 1.5 mol%.  That works out to just under 0.2 psia at the flash temperature.  Correct it back to 100F and you have again less than 0.1 psia.  

In effect, unless you diesel is pretty hot, vapor pressure isn't a concern for NPSHA calcs.  

RE: Vapour Pressure of Diesel

TD2K's VP estimate via flash point is -to my grasping- an excellent approach. There are, however, Diesel specs that alllow for lower flash points.

RE: Vapour Pressure of Diesel

I can't take credit for the flash point method, someone else on the site posted it quite a while ago, I was quite impressed by the approach.

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


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
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. 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