Return to the Irrigation Forum | Post a Follow-Up

 o
Increasing Pressure at Sprinkler Heads?

Posted by dnelms NC (My Page) on
Tue, Apr 27, 10 at 21:11

We've decided to bury our irrigation lines this year and used 1" pipe. The water source is a pond; the pump sends the water to a 100 gallon holding tank. We have 7 sprinker heads attached to 1" standpipes along the gardens' edge. The garden is 200' long and 50' wide. The sprinklers are not reaching across the garden (missing by about 3 to 4 '). So here's the plumbing question.... we've been told that if we change the standpipe (about 6' high) from 1" to 3/4" about 2' oput of the ground, the decrease in pipe size will increase the water pressure? Does anyone have any knowledge that will lend an answer before we cut one and try it out?


Follow-Up Postings:

 o
RE: Increasing Pressure at Sprinkler Heads?

Wrong, Decreasing the pipe size will not increase the pressure, just increases the velocity. You may want to section the piping into two or three zones with bigger gpm nozzles. Glancing through various catalogs, most sprinklers required a 8-9 gpm nozzle at 50psi to achieve a 50 foot radius. I do not know what your pumping specs are so as to be able to provide you with any other info. Bigger pipe has less pressure loss than a smaller pipe at the same gpm.


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Irrigation Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here