Register free!
Search
 
     

Click for Weather
 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 08-11-2010, 09:43 AM
BrasiliaFlyer BrasiliaFlyer is offline
LawnSite Member
 
Join Date: Jul 2010
Location: Park City
Posts: 3
Lateral Pipe Sizes

Hello, just a quick question for the pros on this forum...
I am a homeowner installing my own system on an acre. I want to make the system as robust as possible. The pressurized secondary irrigation system comes through a 2" valve, and averages 55psi, but can drop into the low 40's on occasion. Because of this, I have added more zones with a lower gph requirement, and plan on running two at a time when the pressure is good, but maintain the ability to run one at a time if the pressure and volume ever drop significantly. I have read the irrigationtutorials.com site and the Rainbird design handbook completely.

Originally, I planned on using 1-1/4 inch sch 40 laterals going down to 1" for each head. I know its probably overkill for a 13 gpm zone, but I want to minimize the pressure loss as much as possible, and allow me the flexibility to add larger nozzles if I need to. Both reference sources say that there is virtually no downside to using a slightly larger than required pipe.

Well, then I was at the local irrigation supply house, and the guy said that you must always maintain at least 2 fps inside the pipe to scour away gunky buildup inside the pipe. Irrigationtutorials.com never mentioned this, but if true I am looking at 1" and 3/4" (even 1/2"!) laterals.

So, the question is: has anyone ever heard of this 2 fps requirement, or is this guy drinking the same kool-aid as the guys who say that you'll lose pressure if you go to a larger pipe?

Thank you for your time, and for contributing to this great resource!

PH
Reply With Quote
 

Thread Tools
Display Modes

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 Off

Forum Jump






Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ©1998 - 2012, LawnSite.comô - Moose River Media
All times are GMT -4. The time now is 11:17 AM.

Page generated in 0.12114 seconds with 8 queries