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

Fuel reactions

Fuel reactions

Fuel reactions

Hi dear reader,

I wasn't sure where to post this so I posted it here and on the chemical forum (hope you guys don't mind). I'm a marine engineer and I have a question about my fuel. Our fuel is following the ISO 8217:2010 standard, which speaks of maximum allowance of fuel contamination. Onboard my vessel we're using HFO.

The iso standard says I'm allowed to have up to 300 ppm of Vanadium in my HFO fuel. Now lets take for this example that the standard consumption of fuel is a constant of 100 m³ per week. If I have fuel of 100 ppm does that mean that the damage caused to my engine take 3 times as long as it would for fuel with 300 ppm of Vanadium?

The expected reaction is high temperature corrosion, especially considering that the exhaust line has temperature of 600°C. Take into account that this is a marine engine so high sodium values in the air can be expected. Now I quote: "sodium vanadyl vanadate 5Na2 O. V2O5 . 11 V2 O5 melts at 545 °C. Liquid deposits formed in this way flux the protective oxide layers on structural alloys, making them vulnerable to rapid corrosion." (ref. http://www.swcc.gov.sa/files%5Cassets%5CResearch%5...)

A colleague of mine says the ppm reactions scales logarithmic, but can't explain how and what. Personally this doesn't really sound correct, considering at the end of the 3 weeks, you'll have the same weight of vanadium that went through the engine. The only sense that would make is that perhaps the chemical reactions are caused more often with higher concentrations?

A lot of damage can be expected at my piston crown, turbo charger, exhaust seats & valves and exhaust pipelines, therefor this information is interesting to me. Anybody that knows and can explain the answer to my question? Thanks in advance!

RE: Fuel reactions

I suspect that the reason for higher concentrations of vanadium in fuels for marine engines is probably due to the fact that marine engines are more robust than non-marine engines and consequently less prone to failures.

RE: Fuel reactions

Heh, Chicopee, you clearly did not read the question and to answer your suspicion : there is no proper process to remove vanadium from the crude oil in an economical way. It is an oil-soluble and the amount is dependent on the source of the crude. Venezuelan crude oil for instance is known to have high concentrations of vanadium, therefor the HFO obtained from there almost always has a high ppm of vanadium.

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


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