Register free!


Reply
 
Thread Tools   Display Modes
  #1  
Old 08-11-2012, 12:35 AM
duckworth duckworth is offline
LawnSite Member
 
Join Date: Apr 2010
Posts: 138
12" pro spray vs 18" 1/2" nipple

Well produces 7gpm with 40psi.my question, is there more pressure loss through a 12" prospray with 2000mp or 18" 1/2" nipple with shrudhead and 2000 mp.if there is how much?
__________________
Ralph Dachwitz
Reply With Quote
  #2  
Old 08-11-2012, 12:21 PM
Mike Leary's Avatar
Mike Leary Mike Leary is offline
LawnSite Fanatic
 
Join Date: Mar 2007
Location: Cactus Hug, Arizona
Posts: 20,574
Quote:
Originally Posted by duckworth View Post
Well produces 7gpm with 40psi.my question, is there more pressure loss through a 12" prospray with 2000mp or 18" 1/2" nipple with shrudhead and 2000 mp.if there is how much?
How and where did you take your psi/gpm tests? That is a border-line well. I'd be looking at ALL my friction losses, especially main and lateral lines. Bring the pump guys in and test it for re-charge and drawndown. They might be able to adjust your 60-40 switch and the pressure tank before a stronger pump or a booster is considered.
Reply With Quote
  #3  
Old 08-11-2012, 01:52 PM
duckworth duckworth is offline
LawnSite Member
 
Join Date: Apr 2010
Posts: 138
Thanks for the advise ,but l think you missed my main question
__________________
Ralph Dachwitz
Reply With Quote
  #4  
Old 08-11-2012, 03:48 PM
Mike Leary's Avatar
Mike Leary Mike Leary is offline
LawnSite Fanatic
 
Join Date: Mar 2007
Location: Cactus Hug, Arizona
Posts: 20,574
Quote:
Originally Posted by duckworth View Post
Thanks for the advise ,but l think you missed my main question
Yup, and for a damn good reason.
Reply With Quote
  #5  
Old 08-11-2012, 04:10 PM
duckworth duckworth is offline
LawnSite Member
 
Join Date: Apr 2010
Posts: 138
I take it there's no pressure loss when pushing 12 " riser up .sorry to waste your time .
__________________
Ralph Dachwitz
Reply With Quote
  #6  
Old 08-11-2012, 04:35 PM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is online now
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 40,629
Pressure loss is zilch for the nozzles used with a spray body - A separate value is flow-by, the gpm escaping around the popup piston while the head rises into position
Reply With Quote
  #7  
Old 08-11-2012, 05:36 PM
Mike Leary's Avatar
Mike Leary Mike Leary is offline
LawnSite Fanatic
 
Join Date: Mar 2007
Location: Cactus Hug, Arizona
Posts: 20,574
Quote:
Originally Posted by Wet_Boots View Post
Pressure loss is zilch for the nozzles used with a spray body - A separate value is flow-by, the gpm escaping around the popup piston while the head rises into position
Which, in my early days, I've had happen, especially with 12" Stream-Rotors and Hunter low-drain check valves. It's not interesting standing there with the client with one's zipper undone and shoes un-tied.
Reply With Quote
  #8  
Old 08-11-2012, 05:48 PM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is online now
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 40,629
When the Rainbird 1800 with its improved wiper seal appeared, they gave the flow-by as zero. I created a zone of sprays and popup bubblers around a factory, of close to a hundred popups, that proved that the flow-by was definitely not zero.
Reply With Quote
  #9  
Old 08-11-2012, 06:12 PM
Mike Leary's Avatar
Mike Leary Mike Leary is offline
LawnSite Fanatic
 
Join Date: Mar 2007
Location: Cactus Hug, Arizona
Posts: 20,574
I was called into a large commercial site where the LA swore he saw the heads pop-up during the walkthrough and failed afterwards. I could only figure that air in the lines gave enough pressure to pop the heads the first time, the second time the main was full and the heads failed and sat at complete flow-by. That was a good job for us, given the dipwads had not given us any spare wire.
Reply With Quote
  #10  
Old 08-11-2012, 06:54 PM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is online now
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 40,629
In my case, I simply added a second zone valve at a strategic location, and physically cut the zone in two, and ran them simultaneously to designed performance.

Flow-by was a headache on early popups that used a simple rubber sheet for both gasket and wiper seal, like the first of the toro 570 heads.
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 08:01 PM.

Page generated in 0.08265 seconds with 7 queries