Old 11-03-01, 08:18 AM
beebow's Avatar
Thread Starter
Join Date: Aug 2001
Location: here
Posts: 28
Received 0 Votes on 0 Posts

Here's a question about water pressure vs. pipe diameter for you proffesionals. When I bought my house it already had a sprinkler system installed. The feed line comes off of a outside wall hood. The main pipe looks to be around 3/4" diameter, the sprinkler system tee is around 1/2" copper pipe into an anti siphon valve. The feed from the sipon valve to the sprinkler valve manifold is also 1/2" copper. The valve is 1/2" feeding 8 Hunter sprinkler heads. Now the problem,....the heads will only rise around 1-1 1/2" when activated. I had the water pressure to the house tested and it is well above the minimum that the city considers acceptable. Should the 1/2" line feed 8 heads adequatly, or should the feed be replaced with a larger siphon valve and 3/4" line?
Sponsored Links
Old 11-03-01, 12:16 PM
Join Date: May 2001
Posts: 261
Received 0 Votes on 0 Posts
There is more to sprinkler design than meets the eye. 1/2" is usually not big enough. The method of calculation has many varibles. Here is a site that has the tables and answers you need. Read it over


Good Luck

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Ask a Question
Question Title:
Your question will be posted in: