×
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

Piping loss's

Piping loss's

Piping loss's

(OP)
Just looking for input, I have an engineer telling me of some piping voodoo :)

We have a higher then normal pressure drop thru an 8" condenser line. calc = 10ft drop while actual drop is 18ft.

One engineer states that due to some tight transitions (ie: close coupled 90 deg elbows that the CV for each fitting in not valid and you cant get an accurate cv for close coupled fittings..... ????

another engineer thinks there may be a blockage in the pipe
at multiple points, as we took readings at many locations down the riser, and found 2 locations with higher loss's

RE: Piping loss's

cammax,

If the 90's are connected so the flow is going in a circular or slight spiral pattern, the 90's that follow the first have less dP than the first 90.

If each 90 changes the direction of flow significantly away from circular or a slight spiral pattern, each 90 has the same dP as the first.

Based on this, I'd suspect blockage.

Good luck,
Latexman

RE: Piping loss's

If the pipe is old, i'd check the roughness allowance in the calculation.  Ever seen inside an old condenser pipe?  Scale on scale, little stalagtites, nasty stuff.

RE: Piping loss's

(OP)
First off Thanks- I’m just trying to digest what I have been told as it contradicts my thoughts.
Brand new pipe, so if you had multiple 90's to make a dbl offset you CAN accurately calculate the loss ?

If anyone would like to see actual data from balancing I will share if anyone wants to ponder it.



            

RE: Piping loss's

I am unsure what fluid you are talking about when you reference the line as a condenser line.  Is this the supply or discharge from your condenser?  What is the fluid? Is it possible that you have a different flow regime than your calculations reflect?  If it is a discharge line, could part of the fluid stream be flashing around one of then bends?  

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