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

Steam as a representative fluid as per API 581- 2016 edition

Steam as a representative fluid as per API 581- 2016 edition

Steam as a representative fluid as per API 581- 2016 edition

Good Day for you
I faced a problem during the application of API 581-2016 edition and I hope you could help me in this issue.

I am trying to apply RBI for a steam vessel , when I chose the representative fluid as steam , no release rate was calculated , this is because of the huge value of Cp that was calaculated for steam refer to note 3 in table 4.2 in API 581 -2016 , when using this huge value to calculate k k=Cp/(Cp-R) ,where R=8.314 the result equal to 1.

If you use k=1 in gas release rate equation (equation 3.6 or 3.7- API 581-2016) there will be no result so there will be no consequence . , temperature used is 773 K

RE: Steam as a representative fluid as per API 581- 2016 edition

Looking in two old textbooks, I find values of k=1.33 or 1.329 for steam. It's not clear what pressure that's at, but that could be the difference.

RE: Steam as a representative fluid as per API 581- 2016 edition

1.33 seems reasonable k for steam but I am talking about k that calculated as per API 581 , the problem coming from values Of ideal gas constants (A, B,C,D &E )in table 4.2 in API 581 , these values used in equation in note 3 .

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 - Strategies to Secure Connected Cars with Firewalls
White-hat hackers have demonstrated gaining remote access to dashboard functions and transmissions of connected vehicles. That makes a firewall a vital component of a multilayered approach to vehicle security as well as overall vehicle safety and reliability. Learn strategies to secure with firewalls. Download Now
White Paper - Model Based Engineering for Wire Harness Manufacturing
As complexity rises, current harness manufacturing methods are struggling to keep pace due to manual data exchanges and the inability to capture tribal knowledge. A model-based wire harness manufacturing engineering flow automates data exchange and captures tribal knowledge through design rules to help harness manufacturers improve harness quality and boost efficiency. Download Now
White Paper - What is Generative Design and Why Do You Need It?
Engineers are being asked to produce more sophisticated designs under a perfect storm of complexity, cost, and change management pressures. Generative design empowers automotive design teams to navigate this storm by employing automation, data re-use and synchronization, and framing design in the context of a full vehicle platform. Download Now
eBook - Simulation-Driven Design with SOLIDWORKS
Simulation-driven design can reduce the time and cost of product development. In this engineering.com eBook, we’ll explore how SOLIDWORKS users can access simulation-driven design through the SOLIDWORKS Simulation suite of analysis tools. 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