Register free!
Search
 
     

Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 08-10-2012, 09:04 PM
soafone soafone is offline
LawnSite Member
 
Join Date: Aug 2012
Location: Ontario, Canada
Posts: 29
What is the max flow (gpm) in 1" poly pipe?

I know the 5 ft/sec. rule says you should not exceed 12 gpm when designing your zones using one inch poly pipe, but how many gpm's will a one inch poly line actually allow (max)?

How about 3/4", and 1-1/4"... what are their max?

I read somewhere that many designers ignore the 5'/sec. rule and design based on 10 ft/sec.
Reply With Quote
  #2  
Old 08-10-2012, 09:07 PM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is online now
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 39,809
I have an old system blowing 50 gpm through a short (inaccessible) length of one-inch poly
Reply With Quote
  #3  
Old 08-10-2012, 09:42 PM
Mike Leary's Avatar
Mike Leary Mike Leary is offline
LawnSite Fanatic
 
Join Date: Mar 2007
Location: Winnemucca, Nevada
Posts: 20,562
Quote:
Originally Posted by soafone View Post
I read somewhere that many designers ignore the 5'/sec. rule and design based on 10 ft/sec.
Read on, the five scond rule was not invented because no one had anything better to do. I've heard of someone raising the 5' rule, but I don't agree.
Reply With Quote
  #4  
Old 08-10-2012, 10:01 PM
hoskm01's Avatar
hoskm01 hoskm01 is offline
LawnSite Fanatic
 
Join Date: Aug 2005
Location: Phoenix Metro
Posts: 5,695
Quote:
Originally Posted by soafone View Post

I read somewhere that many designers ignore the 5'/sec. rule and design based on 10 ft/sec.

Some say 7.5 fps. What's your comfort level at?

Like Mike said, no one just pulled 5' from their arse and called it macaroni.
__________________
Crayons taste like Purple
Reply With Quote
  #5  
Old 08-11-2012, 07:26 AM
txirrigation txirrigation is online now
LawnSite Senior Member
 
Join Date: Aug 2010
Location: Texas
Posts: 930
Stay with 5fps when using plastic.

7.5 is what people say about metal, but we use 9fps as well as most irrigators.
Reply With Quote
  #6  
Old 08-12-2012, 03:38 PM
CAPT Stream Rotar's Avatar
CAPT Stream Rotar CAPT Stream Rotar is offline
LawnSite Fanatic
 
Join Date: Apr 2007
Location: Cape Cod, Ma
Posts: 5,466
I've put 20 gPm through 3/4 for a short run
Then to a drip 4 way

No clamps and 6 years later it still holds
Posted via Mobile Device
Reply With Quote
  #7  
Old 08-12-2012, 03:53 PM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is online now
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 39,809
do they even have friction loss tables for flows way beyond design guidelines
Reply With Quote
  #8  
Old 08-12-2012, 05:30 PM
1idejim's Avatar
1idejim 1idejim is online now
LawnSite Fanatic
 
Join Date: Jul 2009
Location: State of Jefferson
Posts: 6,906
That question has "WHY" written all over it Morris.
Posted via Mobile Device
Reply With Quote
  #9  
Old 08-12-2012, 08:10 PM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is online now
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 39,809
It's not so much as wanting a design guide for wandering astray as it is wondering what's going on in existing systems that are using flows that are off the charts.
Reply With Quote
  #10  
Old 08-12-2012, 10:56 PM
1idejim's Avatar
1idejim 1idejim is online now
LawnSite Fanatic
 
Join Date: Jul 2009
Location: State of Jefferson
Posts: 6,906
Quote:
Originally Posted by Wet_Boots View Post
It's not so much as wanting a design guide for wandering astray as it is wondering what's going on in existing systems that are using flows that are off the charts.
they make lots of noise and things break or wear out quicker
Posted via Mobile Device
Reply With Quote
Reply

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 02:23 AM.

Page generated in 0.08521 seconds with 9 queries