×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Retention time for 3 phase separation in horizontal separators

## Retention time for 3 phase separation in horizontal separators

(OP)
Hi,

can anyone help with the equation/chart or tool used for estimating the residence time for separation of oil and water in a 3 phase separator, for standard sizes, e.g. 36"x10' horizontal 3 phase separators...?

Thanks a lot.

As much as possible, do it right the first time...

### RE: Retention time for 3 phase separation in horizontal separators

If you already know the size of the separator (and the weir height etc. then you will find the residence time by deviding the volume in the sep. by the volume flow of the phae.

But i suspect that what you are looking for is the required size - not the given? API and GPSA has guidelines. I think its API 12J but i dont have the std. here for checking. The equations are generally relating to Navier Stokes law re. terminal settling velocity.

Best regards

Morten

### RE: Retention time for 3 phase separation in horizontal separators

Morten,
Are you sure the equations relate to "Navier Stokes" not "Stokes Law"? Navier Stokes has zero practical applications as postulated. People have carved off pieces and assumed stuff out of existence as special cases that have been amazingly useful, but the basic Navier Stokes equation is pretty non-practical.

David Simpson, PE
MuleShoe Engineering

"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.

### RE: Retention time for 3 phase separation in horizontal separators

Got me David I didt find the refernces myself and may remember incorrectly. The part about the terminal (or ultimate?) Setteling velocity of water (or oil) droplets in oil (or water), that im fairly certain of.

But i seem to recall that Campbell also states some "good starting point"

#### 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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!