×
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

Force & Moment : Discharge Head with Dresser Coupling

Force & Moment : Discharge Head with Dresser Coupling

Force & Moment : Discharge Head with Dresser Coupling

(OP)
What are the forces acts on the discharge head for vertical pump ?

The discharge head is not having flange instead it is coupled to piping system through dresser coupling.

I would like to know how to calculate the forces exerting on the discharge head due to fluid back pressure (at shut-off condition).

Thanks,
Arline

RE: Force & Moment : Discharge Head with Dresser Coupling

The force will be the area of the discharge pipe or coupling x the presure at shut-off.

Phitsanulok
Thailand

RE: Force & Moment : Discharge Head with Dresser Coupling

If you are going to use a dresser coupling for that application make sure to use "harnessed type". Harness is a number of tie rods that bridges over the coupling and takes the thrust loads so that you don't have to be worry for the coupling to come apart.

dresser couplings could tolerate some thrust load before starting to slide relative to the pipe. These load values are usually published by the coupling manufacturers. But again I think using a harnessed coupling makes much more sense.

RE: Force & Moment : Discharge Head with Dresser Coupling

(OP)
Hi PersianEng,
          I am using harnessed type of dresser coupling in my design.

At the time of fluid back pressure (shut-off conditions) does the nozzle sees only axial (Z-direction) thrust load or will we have any forces & moments in X & Y direction also ?

Thanks in advance

Prasad

RE: Force & Moment : Discharge Head with Dresser Coupling

Bending moment on discharge pipe may happen due to axial forces in the header transferred to the discharge at a Tee fitting or if there are bends in discharge pipe itself.

At shutdown if there are measures to prohibit transient and pulsating high pressures from happening, the is no problem. However, any sudden closure of valves including check valves triggers pressure spikes even higher than pump sht-off head. The best choice for check valve is a nozzle check valve that gradually closes but is still fast enough to prevent flow reversals.

The header itself shall be well designed and supported. The basic idea is that each spool has to be supported at two points along the pipe as one fix, one sliding type.

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