×
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

ATM pressure for Pressure vessel

ATM pressure for Pressure vessel

ATM pressure for Pressure vessel

(OP)
Hi guys, I quite new in pressure vessel this field. I got 1 question about the atmospheric pressure (atm pressure) actually is equal to 0 or 1 when using atm pressure to design a vessel??

RE: ATM pressure for Pressure vessel

Hint; What is the gage pressure of the fluid in your pressure vessel?

RE: ATM pressure for Pressure vessel

Keep the same units as your other pressures - if its bara then its 1, if its barg then its zero

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

RE: ATM pressure for Pressure vessel

(OP)
Thanks for the info...really appreciate...

RE: ATM pressure for Pressure vessel

In case of ATM pressure case, there will be pressure at bottom parts of vessel due to the liquid head based on the height of liquid above it. If liquid is heavier than water then specific gravity needs to be considered for static pressure of liquid. Also make there is not a possibility of vacuum during the emptying/pumping out liquid. This may lead to external pressure consideration also.

RE: ATM pressure for Pressure vessel

An atmospheric vessel would be e.g. 1.034 BarG internal and 1.034 BarG external at the same time. Be careful when designing as these values are only acceptable when both internal & external pressures are the same, i.e. the pressure in the tank is equal to the pressure in the atmosphere. For instance if you run a vessel calc in PV Elite software, it will calculate internal & external min. required thickness separately. So if I apply 1.034 BarG int. and 1.034 BarG ext. to my PVElite calc, the software assumes there is a potential case of 1.034 BarG ext. and 0 BarG internal, so the vessel would need to be designed for Full vacuum. This will drive up your shell thickness unnecessarily if you are designing an atmospheric vessel. You are better off applying a minimal pressure of e.g. something around 40 mBar (0.04 Bar) internal and external instead of the full 1.034 BarG.

Also note Dineshakabari's comment regarding potential vacuum case - even if you don't envisage a vacuum it could still potentially happen!

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