Register free!
Search
 
     

Click for Weather
Reply
 
Thread Tools Display Modes
  #1  
Old 04-11-2005, 10:08 AM
jcom jcom is offline
LawnSite Senior Member
 
Join Date: Jan 2005
Location: Bismarck, ND
Posts: 791
RPZ or double-check?

I am interested in your experiences with these two devices as I will be installing one or the other in a system soon.

Can either be blown out through the unit? Will they drain if drains are provided on either side as I don't want either to freeze on those nights when it is only into the 20's?

Thanks,

John
Reply With Quote
  #2  
Old 04-11-2005, 10:56 AM
DanaMac's Avatar
DanaMac DanaMac is online now
LawnSite Fanatic
 
Join Date: Mar 2002
Location: Somewhere in the state of CO
Posts: 13,071
You can blow out thru either device, BUT it would be better to put in a connection to hook up to after the BP and not hook to the testcocks. Put a drain on both sides of the BP. But that doesn't mean it won't freeze just by draing them. The Febco 825y RP (DCV also I think) holds water in the area that the second check valve is located and will split the body if not taken apart and drained.
Reply With Quote
  #3  
Old 04-11-2005, 11:07 AM
jcom jcom is offline
LawnSite Senior Member
 
Join Date: Jan 2005
Location: Bismarck, ND
Posts: 791
Will the water be removed when blown through? How difficult to take apart and drain manually?

Thanks for the response. I have used PVB's and now have an instance where it is necessary to install one of the others

John
Reply With Quote
  #4  
Old 04-12-2005, 02:20 AM
jerryrwm jerryrwm is offline
LawnSite Bronze Member
 
Join Date: Aug 2004
Location: Central Wisconsin
Posts: 1,273
Dana,

Quick question. In your area, when you take apart an RPZ like that, do you have to have it tested/certified when it goes back on line?

We had a good freeze here this year - imagine Corpus Christi, TX with 6" - 8" of snow and 28 degrees on Christmas Day! First time in over 110 yrs.

Anyway, we are still finding busted PVBs as people are now turning on the systems. When replacing the bonnet assy, we are required to test/cert. the device again.

Jerry R
Reply With Quote
  #5  
Old 04-12-2005, 07:54 AM
bicmudpuppy's Avatar
bicmudpuppy bicmudpuppy is offline
LawnSite Silver Member
 
Join Date: Apr 2005
Location: Aztec, NM
Posts: 2,792
Hey guys, if your backflow certified, go back and remember your training.........If the device was removed from service for ANY reason, you must insure it is in proper working order when you restore it to service. That means a test. You don't necesarily have to report or return a test sheet, but by uniform code and your certification training, you are liable for its function at the time you return it to service. Now, want to really stir a fuss........that's why my spring turn ons are priced less than my competition.....the backflow cert is FREE. Our code enforcement here is so poor that I have turned in FAILED sheets on devices that the customer wouldn't pay to fix (yes, I left them in the off state upon failing), and city water does nothing about it. If you don't test, you get a second and maybe a third threatening letter, but they have NEVER shut anyones water off. And that includes non-irrigation as well. I know a property whose fire DC's have been failed and not repaired for over 5 years. My policy is that I test them for free until they fail, then I expect my customers to pay for the re-build to keep their equipment up to code, or they go in search of a paper hanging irrigator...my part of the country is full of them.
Reply With Quote
  #6  
Old 04-12-2005, 10:54 AM
Wet_Boots's Avatar
Wet_Boots Wet_Boots is online now
LawnSite Fanatic
 
Join Date: Mar 2005
Location: metro NYC
Posts: 39,806
Cutting in an RPZ loses 10 psi or more...

...so hopefully the existing system can sustain that much loss of pressure. The psi loss for a double check valve assembly is closer to 5 psi. You can blow out a sprinkler system through a double check valve, no problem. An RPZ is more of a winterizing problem, since many of them have sections that won't be empty of water until you physically dismantle the valve. (these things were designed in Sunny California, where they don't worry much about freezing water) - it isn't rocket science to dismantle and reassemble the RPZ. As annoying as an RPZ can be, it might make sense to use it instead of a DCA, because when codes get tightened, as codes will, the DCA is likely to not be an approved device, and old DCA's may not be 'grandfathered' in.
Reply With Quote
  #7  
Old 04-13-2005, 12:20 AM
MOlawnman MOlawnman is offline
LawnSite Member
 
Join Date: Feb 2002
Location: Missouri
Posts: 161
ALL BP's must be tested and certified every year regardless if it was taken out of service or not. The water department here is very strict..they will shut you off and lock the meter for non-compliance of the backflow law. Backed up by Missouri DNR.
__________________
Steve
Reply With Quote
  #8  
Old 04-13-2005, 12:37 AM
bicmudpuppy's Avatar
bicmudpuppy bicmudpuppy is offline
LawnSite Silver Member
 
Join Date: Apr 2005
Location: Aztec, NM
Posts: 2,792
Yep, Missouri isn't to trifle with, but cross the line into KCK and see what a mess they've made of things. The rest of the state is almost as screwed up too. The area I was refering to as not enforcing any backflow code is Lawrence.
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 08:14 PM.

Page generated in 0.08902 seconds with 9 queries