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


Liquid hydrocarbon rain out and pool fire formation

Liquid hydrocarbon rain out and pool fire formation

Liquid hydrocarbon rain out and pool fire formation


I am currently assessing hydrocarbon pool fire formation from leak sources in an NGL/LPG service. My company has an internal quick reference flow chart to decide whether or not hydrocarbons released in the form of an aerosol jet could rain out and form a pool of liquids at grade. This flow chart is simple to use and all one needs is the normal boiling point of the liquid, the adiabatic flash fraction at 1 bar from MOP and the resulting adiabatic flash temperature. The problem is that I cant locate any engineers which understand the origin or the background of the limits on this decision tree. Therefore I feel that this is difficult to defend to health and safety regulators.

To demonstrate ALARP to a regulator we often make use of codes accepted by wider industry e.g. API codes. Does anyone know if there is an industry accepted method/code/best practice guideline to determining if hydrocarbons can rain out and form pools?

Many thanks


RE: Liquid hydrocarbon rain out and pool fire formation

Would be reasonable that liquid pools can form from an NGL or LPG stream, if flashpoint temp < ambient, and the adiabatic flash liquid fraction >0 ?

RE: Liquid hydrocarbon rain out and pool fire formation

For accurate assessment you would need to consider computational fluid dynamics (CFD) modeling. The best in class for that is Gexcon FLACS software, because it takes into account the actual plant geometry (obstacles) and characteristics of terrain (slopes, elevation changes etc.) into account. For simpler calculations, any consequence modeling software would do but you need to be careful how you interpret the results in actual environment.

See also section 2.2 from the document http://www.ogp.org.uk/pubs/434-07.pdf and also http://www.hse.gov.uk/research/rrpdf/rr1001.pdf

Process Engineer, MSChE

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 – Choosing the Right Spring Loaded Connector
In today’s cost-sensitive world, designers are often driven to specify the lowest cost solution for every aspect of their designs to ensure that their solution is competitively priced and their company remains profitable. However, specifying a low-cost, low-quality connector solution can result in premature failure, considerable re-work costs and damage to reputations. Download Now
eBook – Own the Lifecycle: Sustainable Business Transformation
Increasingly, product and services companies are seeking more information and control in the operational lifecycle of their products, including service and use. Better information about the operational lifecycle, and the ability to use that information, requires more than just unstructured data flowing back from products in the field. 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