×
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

sizing large pipe lines

sizing large pipe lines

sizing large pipe lines

(OP)
How do you size 6" and above lines for chilled and hot water use?

RE: sizing large pipe lines


The two major factors that dictate pipe sizing are 1.friction/metre run 2.velocity

The limits for above parameters are decided based on issues such as total pipe run,annual operating hours,operating cost and initial investment cost.A general guide for water services pipe would be a maximum of 5 m/100 metre run of pipe for the friction rate and a maximum flow velocity of 3 m/s.

Generally pipes of diamemetre lower than 6" are selected based on friction rate and the velocity automaticall y falls into the acceptable range.For the larger diameter pipes this does not hold good.The selection is often based on flow velocity.Large pipes as a result have very low friction drops as compared to smaller dia pipes.

RE: sizing large pipe lines

An important factor in hot water heating & chilled water piping is velocity noise in occupied areas. The pressure drop and related velocity that can be easily tolerated in process areas, produces a background noise level in offices, apartments, hotel rooms, etc. will generate no end of complaints from the occupants of those spaces.

RE: sizing large pipe lines

For noise concern we typically limit velocity to not exceed 6 FPS and pressure drop not to exceed 4 ft wg./100 ft of pipe. In mechanical rooms & where noise is not a concern we select piping for 6 to 8.6 FPS velocity. If operating hours would only be 2000 hours/yr or less, we can push piping up to 12 FPS providing noise will not be a concern. At this high velocity, pipe erosion can be a concern. If piping is old and corroded I would recommend not going over 6 FPS.

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