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Old 09-15-2012, 07:59 PM   #1
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huge water pressure drop from sprinklers


Posted this in the lawn section because of my sprinklers, but people said it might get better attention here.

huge water pressure drop from sprinklers



Hello,

Just bought a new house and have had some water pressure issues. As soon as the sprinklers turn on everything using water in the house barely works or doesnt work (sinks dribble, toilets wont fill, etc)

I tested our pressure and it registers at 88-89 psi. When we turn on the sprinklers it drops to about 21 psi, almost a 70psi drop!

Did the same test at our other house and we have 115 psi there, and the drop is only 10psi down to 105.

We also don't have very many sprinklers on each zone (all are rainbird 1800's). There are about 5 per zone, and they don't even pop up completely or spray out to there max distance (15').

Pretty puzzled on this one. our other home with the 115 water pressure, has large sprinkler heads (rainbird 2045's) on each zone and has excellent distance on each one (5 per zone) and no noticable lose on indoor pressure.

any thoughts or other tests are appreciated. thanks!

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Old 09-15-2012, 08:15 PM   #2
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huge water pressure drop from sprinklers


alot of questions need answered....how big is service line....did they size the piping to sprinklers to the proper size...is it copper ,,galvanized.. plastic...is there a pressure reducing valve in line ...and is it working......

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Old 09-15-2012, 08:57 PM   #3
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huge water pressure drop from sprinklers


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alot of questions need answered....how big is service line....did they size the piping to sprinklers to the proper size...is it copper ,,galvanized.. plastic...is there a pressure reducing valve in line ...and is it working......
I'm going with under sized service....
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Old 09-16-2012, 07:10 AM   #4
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huge water pressure drop from sprinklers


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I'm going with under sized service....
yep i was thinking that...but most houses had 3/4 service lines...Iam going with with bad pressure regulator,,,,or old galvanized still in system.. edit....just see where he said new house......maybe Iam wrong....maybe new to him but still older home...

Last edited by ben's plumbing; 09-16-2012 at 07:14 AM. Reason: can't read...
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Old 09-16-2012, 05:35 PM   #5
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huge water pressure drop from sprinklers


3/4" service line, and all the main piping under the house is galvanized 3/4"

3/4" on all the sprinkler valves.... not sure if the line gets reduced at some on the sprinkler system.

house is new to me but 50 years old. I don't think there is a pressure regulator on it.... could do some more searching though.
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Old 09-16-2012, 06:54 PM   #6
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huge water pressure drop from sprinklers


50 year old 3/4" service line is now probably 1/2" or less due to mineral build up inside the pipe. Even though you have good pressure, you don't have volume.
How many sprinklers are on a zone?
Are all the water service valves between the 100% open?
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Old 09-17-2012, 04:17 PM   #7
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huge water pressure drop from sprinklers


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50 year old 3/4" service line is now probably 1/2" or less due to mineral build up inside the pipe. Even though you have good pressure, you don't have volume.
How many sprinklers are on a zone?
Are all the water service valves between the 100% open?
yep 3/4 line has no volume left to it ...he says 3/4 galvanized to heads....that has to be the trouble..50 yr old galvanized ...out lasted it life...time to replace it ...
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Old 09-17-2012, 05:38 PM   #8
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huge water pressure drop from sprinklers


Or short solution, directly from the water meter, feed just the sprinkler with it own 3/4 pex pipe (from a Tee), but you know that someday you'll have to replace the entire galvanized system of the house.

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