×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Jobs

API system of density measurement - WHY?

API system of density measurement - WHY?

API system of density measurement - WHY?

(OP)
Does anyone know the reason behind the API system of density measurement? I though it might be because it's additive for if two oils are being mixed together, but does anyone know for sure?

RE: API system of density measurement - WHY?

The way that you speak of density, I gather that you are addressing the API gravity measurements with increasing numbers for lighter densities, correct?

John

RE: API system of density measurement - WHY?

Is this what you are looking for? Following was copied from www.chevron.com:

"The United States petroleum industry often uses API gravity instead of relative density. The following equation relates API gravity, in degrees API (°API), to relative density.

                   141.5         
°API  =  ––––––––––––-   –  131.5
             RD (60 / 60°F)


While API gravity measurements may be made on liquids at temperatures other than 60°F, the results are always converted to the values at 60°F, the standard temperature.
API gravity is an arbitrary scale developed by the American Petroleum Institute in the early years of the petroleum industry. Density had been used as a primary indicator of quality for liquid products. However the higher value products have lower densities. The API gravity scale was constructed so that API gravity increases inversely to density; therefore, higher value products have higher API gravities. And while the densities of most petroleum products are less than one, the API gravity scale also was constructed so that most values are between 10 and 70."

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!


Resources