×
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

vacuum seawater deaeration pumps -seawater gas concs.

vacuum seawater deaeration pumps -seawater gas concs.

vacuum seawater deaeration pumps -seawater gas concs.

(OP)
Hi,

I'm attempting to assess (at a preliminary stage) whether a vacuum pump system (liquid ring pump and ejector operating in two stages) is adequate for an increase in duty in the seawater flow. I have a pump curve for the liquid ring pump but no other information. It gives a curve of torr against a flowrate (air at 20C).

My assumption is that I need to know the amount of dissolved oxygen and other gases in the seawater against pressure, get a flowrate of gases and vacuum required - then compare against the pump curve.

However, I can't find a good source of info. on the amount of gases that are in seawater (North Sea spec.). This seems to be crucial - does anyone have a reference? (Since the vacuum pump will pull all sorts of gases the oxygen alone won't be sufficient so I don't think I can just estimate.)

Also I would appreciate any suggestions on how to assess the ejector capacity - I have no experience of working with these items.

Thanks.   

RE: vacuum seawater deaeration pumps -seawater gas concs.

This paper has a graph of the soluability of oxygen in water vs temperature.

I don't think that it matters whether the water is fresh water or sea water, or that is to say I don't think the difference is measurable.

rmw

http://asme.pinetec.com/ijpgc2000/data/pdfs/15033.pdf

RE: vacuum seawater deaeration pumps -seawater gas concs.


Salinity affects somewhat the solubilities of gases. Thus sea water dissolves about 80% of the amount ~zero-salt water would.
Temperatures, depth, etc., are all factors that affect solubilities.

Typical solubilities at 25oC, in mg/kg would be:
nitrogen, 11; oxygen, 7; argon 0.4.
At 15oC, an increase of 20% is considered reasonable.

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