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


Wet Steam table.

Wet Steam table.

Wet Steam table.

If we have saturated steam at 97 % quality.  If we are measuring a temperature 2 degrees lower than the saturated temperature.  What could cause that?  We are measuring the pressure and the temperature.   

RE: Wet Steam table.

Measurement errors.

RE: Wet Steam table.

Or out of whack or non-calibrated instruments

RE: Wet Steam table.

Agree with ash9144's and MikethEngineer's answers.

What is the accuracy of your temperature sensor/transmitter combination? Thermal effect? What about the pressure transmitter? At what temperature and pressure were they calibrated? What was the accuracy of the calibration standard? Do you have a calibration report?

What pressure/temperature steam are you working with? If 1000°F, being off by 2°F is trivial considering you are working with two sensors that both have error bands.

Is your temperature sensor insertion well insulated the same as the rest of the pipe or vessel? Your sensor probe may be conducting heat to the surroundings. Is the vessel well-insulated? The probe may be radiating to the vessel wall.

Lots of possibilites.

Good on ya,

Goober Dave

Haven't see the forum policies?  Do so now: Forum Policies

RE: Wet Steam table.

Perhaps, altho I doubt it, an erroneous steam table?

RE: Wet Steam table.

So if you aren't able to measure you steam temperature accurately, how do you know that the quality is 97%?


RE: Wet Steam table.

Did you compensate the pressure measurements for altitude?

RE: Wet Steam table.

Are you sure you have no air or other gases in there at the time of measuring?

RE: Wet Steam table.

What do the tips of your pressure sensing lines look like?
Zero flow velocity? are you sure that there is never any water in the lines?
This is a sensor issue.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Wet Steam table.

The OP's keyboard seems to have gone dead.


RE: Wet Steam table.

Is there a thermowell involved?

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!


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:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close