Register free!
Search
 
     

Click for Weather
Reply
 
Thread Tools Display Modes
  #31  
Old 06-22-2013, 08:41 AM
Kiril Kiril is offline
LawnSite Fanatic
 
Join Date: Jun 2007
Location: District 9 CA
Posts: 18,333
Quote:
Originally Posted by HunterTekGeek View Post
To return the sprinkler to nearly new condition, simply replace the riser seal and reinstall the head. For more information see the information below.

http://www.hunterindustries.com/supp...-or-repair-fix
That's what I have been telling them for years .... got a bunch of flac for it too.
Reply With Quote
  #32  
Old 06-22-2013, 10:29 AM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is offline
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 39,830
Quote:
Originally Posted by Kiril View Post
That's what I have been telling them for years .... got a bunch of flac for it too.
when the popup piston is roughed up, replacing the entire head is the only best option
Reply With Quote
  #33  
Old 06-23-2013, 07:23 AM
hunterpreferred hunterpreferred is offline
LawnSite Member
 
Join Date: Dec 2009
Location: southern RI
Posts: 166
We swap out PGP's daily with I 20's. I would never waste time replacing the seal only to do it again in the very near future. We installed only PGP's for about 10 years and I sometimes feel bad trying to explain to the home owner that the heads we installed are junk. Strange part is most of them don't expect anything to last more than 5 years and they say just replace them all. We now only install I 20's and I feel they are a much better product for only a few dollars more. The seals are completely different and I think the 3 threads on the body do a much better job keeping it tight opposed to the single thread on the PGP. I wouldn't install a PGP now if you gave me a free case.
Reply With Quote
  #34  
Old 06-23-2013, 09:08 AM
RWI RWI is offline
Banned
 
Join Date: May 2013
Location: GA
Posts: 125
Quote:
Originally Posted by HunterTekGeek View Post
The PGP rotors are built to withstand operating pressure of up to 100 PSI without blowing apart, but there can be other external factors that create problems. For instance, if there are slopes or even slight elevation changes, then the lateral pipes drain out. So when the zone first starts there’s an excessive amount of water flowing through the empty pipes at a high velocity. When that water stops, sometimes it can blow off nozzle turrets or break body caps. To help prevent the low head drainage and start up damage, install drain check valves in the PGPs which hold back about 3-4’ of elevation change, or better yet, install the I-20 that comes with a stronger spring and check valve that holds back 10’ of elevation change.

As for the nozzles themselves, they are designed to operate most efficiently at 40-50 PSI. If the pressure is higher, the water droplets are smaller and more misting and drifting will occur. And, if the nozzles are diffused to reduce the radius, that too may cause additional misting. How do you accurately check the dynamic pressure? Use a pitot tube shown below. Simply place the very small tube directly into the center hole of the nozzle and read the gauge. More importantly how do you reduce the pressure if it’s too high? One possible way is to turn down the flow control on the valve, then recheck the pressure.

The leaking may be from caused from an old, deteriorated, hardened riser seal. That seal not only seals on the outside of riser that pops up, but it also seals against the inside of the body. Once the seal is old, it can shrink in size and harden, then it no longer is flexible enough to seal on the body, so water leaks below the cap. To return the sprinkler to nearly new condition, simply replace the riser seal and reinstall the head. For more information see the information below.

http://www.hunterindustries.com/supp...-or-repair-fix
Uh no, the local Hunter rep told me PGPs were not made to withstand over 50psi of pressure. Of course it will handle the pressure on for a while, but that head 6 months from now will have all of the gears stripped out.

Another question, does flow control reducer the pressure? You insinuate that it does and I am not sure I agree with that. Jim? Mike?
Reply With Quote
  #35  
Old 06-23-2013, 09:16 AM
RWI RWI is offline
Banned
 
Join Date: May 2013
Location: GA
Posts: 125
Quote:
Originally Posted by SoCalLandscapeMgmt View Post
make you wish that you had installed a RB 5000+ series instead?
....................yes!
Reply With Quote
  #36  
Old 06-23-2013, 10:46 AM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is offline
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 39,830
A lot of early Rainbird gear-drive rotors simply stopped turning, and at that point, who cares about its superior wiper seal?
Reply With Quote
  #37  
Old 06-23-2013, 10:49 AM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is offline
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 39,830
Quote:
Originally Posted by Mike Leary View Post
I know Boots thinks the guts are the same, but in 12 years, I've had zero problems with I-20 stainless 6".
I-20 heads have the exact same gear drive as the PGP - getting rid of the smallest nozzles can't help but improve its track record in comparison to the PGP
Reply With Quote
  #38  
Old 06-23-2013, 10:57 AM
Kiril Kiril is offline
LawnSite Fanatic
 
Join Date: Jun 2007
Location: District 9 CA
Posts: 18,333
Quote:
Originally Posted by RWI View Post
Uh no, the local Hunter rep told me PGPs were not made to withstand over 50psi of pressure.
The Hunter rep needs to read the specs on the head then.

Quote:
Originally Posted by RWI View Post
Another question, does flow control reducer the pressure? You insinuate that it does and I am not sure I agree with that. Jim? Mike?
Why don't you agree? Perhaps a math lesson?

http://water.me.vccs.edu/courses/CIV...son3b_math.htm

or maybe this will help.

http://www.ctgclean.com/tech-blog/20...e-which-is-it/
Reply With Quote
  #39  
Old 06-23-2013, 12:43 PM
Mike Leary's Avatar
Mike Leary Mike Leary is offline
LawnSite Fanatic
 
Join Date: Mar 2007
Location: Winnemucca, Nevada
Posts: 20,579
Quote:
Originally Posted by Wet_Boots View Post
getting rid of the smallest nozzles can't help but improve its track record in comparison to the PGP
True, the fact that we knew how to install and used stainless risers might have helped, as well.
Reply With Quote
  #40  
Old 06-23-2013, 02:15 PM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is offline
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 39,830
Quote:
Originally Posted by Mike Leary View Post
True, the fact that we knew how to install and used stainless risers might have helped, as well.
the metal shell on the riser does zip for the gear drive, just like it does zip for the actual connection of the nozzle turret, which breaks off as easily as it does on a PGP
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 08:02 AM.

Page generated in 0.08274 seconds with 8 queries