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

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


White Paper - How ESI is Helping Move New Medical Device Product to Market Quicker & More Cost Effic
Early Supplier Involvement has long been a strategy employed by manufacturers to produce innovative products. Now, it almost seems like a necessity. Because decisions made in the design phase can positively affect product quality and costs, this can help add value to OEM bottom lines. This white paper will discuss many facets of ESI, including why it’s so valuable today, what challenges limit the benefits of ESI, how cost is impacted, and more. Download Now
White Paper - Moving to a Driverless Future
This white paper describes what we see as the best practices to support a sustainable engineering process for autonomous vehicle design. It exposes how to use simulation and testing in common frameworks to enable design exploration, verification and validation for the development of autonomous cars at a system, software and full-vehicle level to drive a mature product development process for automated driving. Download Now
Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. 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