Old 11-03-01, 07:18 AM
beebow's Avatar
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Join Date: Aug 2001
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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?
Old 11-03-01, 11:16 AM
Join Date: May 2001
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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

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