DIY Chatroom Home Improvement Forum

DIY Chatroom Home Improvement Forum (http://www.diychatroom.com/)
-   Plumbing (http://www.diychatroom.com/f7/)
-   -   huge water pressure drop from sprinklers (http://www.diychatroom.com/f7/huge-water-pressure-drop-sprinklers-156924/)

rockstar 09-15-2012 07:59 PM

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.

http://www.diychatroom.com/f16/huge-...nklers-156815/



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!

ben's plumbing 09-15-2012 08:15 PM

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......

TheEplumber 09-15-2012 08:57 PM

Quote:

Originally Posted by ben's plumbing (Post 1010649)
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....

ben's plumbing 09-16-2012 07:10 AM

Quote:

Originally Posted by TheEplumber (Post 1010674)
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...

rockstar 09-16-2012 05:35 PM

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.

TheEplumber 09-16-2012 06:54 PM

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?

ben's plumbing 09-17-2012 04:17 PM

Quote:

Originally Posted by TheEplumber (Post 1011181)
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 ...

Pirulo 09-17-2012 05:38 PM

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.


All times are GMT -5. The time now is 09:44 AM.


Copyright 2003-2014 Escalate Media LP. All Rights Reserved