×
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.

# Maximum input flowrate to pressure vessel

## Maximum input flowrate to pressure vessel

(OP)
Hi, currently I am designing pipeline, piping and pressure vessel system. I want to know maximum limit fluid's velocity input to pressure vessel. Is there any standard/code/book that I can refer to?

### RE: Maximum input flowrate to pressure vessel

Not that I am aware of.

Plenty of guidelines and Rules of Thumb, but too many variables for any code to proscribe a limit.

Gas?, liquid?, 2 or 3 phase fluid?

So that's three variables before you start on anything else.

It's a very vague question.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Maximum input flowrate to pressure vessel

(OP)
Actually in Liquid phase

### RE: Maximum input flowrate to pressure vessel

Well above 5 m/sec you get high pressure drop and surge pressures, but generally as you enter a PV the velocity reduces by a factor of 10 or more so not sure what your issue is?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Maximum input flowrate to pressure vessel

(OP)
Well, thank you for the explanation. The issue is I worry that if fluid's velocity is too fast (when entering Pressure vessel) it could damage the pressure vessel. What I want to find is the rule of thumb or formula to determine the limit of fluid's velocity.

For instance, in API 14E (I think) there is limit (recommendation) fluid's velocity in pipeline which is 3-15 ft/s.

### RE: Maximum input flowrate to pressure vessel

All depends on the internal make up of the PV. Hence why there is no set limit.

Single phase liquid velocity generally dissipates very fast, but gas and two phase fluids can hit parts of the PV if not properly contained.

Your PV engineer or designer will be aware of this.
so there are often divertor plates installed if a jet of liquid hits something within 5D of the incoming nozzle, but if not then it naturally dissipates. But is the PV full of liquid or has a gas phase? A HX will be completely different again.

And API 14E is not relevant here.

Generally you want to not have high (>5m/sec) velocity so sometimes you need to add a reducer just before the nozzle to go from say 8 inch pipe to a 12" nozzle, but not the other way around (!)

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

#### 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!