You are not logged in.

3/4" or 1" Backflow

Dear visitor, welcome to SPRINKLER TALK FORUM - You Got Questions, We've Got Answers. If this is your first visit here, please read the Help. It explains how this page works. You must be registered before you can use all the page's features. Please use the registration form, to register here or read more information about the registration process. If you are already registered, please login here.

chpsk8

Active Member

Posts: 5

1

Sunday, March 17th 2002, 8:16am

3/4" or 1" Backflow

I am curious if I can use a 3/4" backflow on my system or should I use a 1". I am tapping in right after the meter in my house (3/4"). My thought was to use 3/4" copper to span the 17' to the outside of my house, then either convert to 1" copper and install a 1" Febco, or keep the 3/4" copper and go to a 3/4" backflow, then out of the backflow size up to my 1" poly main line. What are the pros and cons of 1" backflow vs. 3/4. I want to go the best route possible, both economical and performance.

RVLI

Supreme Member

Posts: 462

Location: USA

2

Tuesday, March 19th 2002, 11:12am

I have fixed many backflow devices that are too small in pipe size. I would use 1" copper from your copper mainline up to your backflow device, then use PVC pipe for your sprinkler mainline. Do not use poly for your mainline. It cannot withstand the constant pressure that mainlines hold. Hope this helps and good luck!!

Rays Sprinklers

Supreme Member

Posts: 493

Location: USA

3

Saturday, May 17th 2003, 2:20pm

I would use 1" (much better) after the backflow use PVC (schedule 40) right to your control valves. Remember to put the PVB in a garden out of the way 12" above ground and OUTSIDE. The Double checks can go in the ground or inside.



Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers
Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers

RVLI

Supreme Member

Posts: 462

Location: USA

4

Saturday, May 17th 2003, 5:05pm

<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>Remember to put the PVB in a garden <hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=2 id=quote>

Install your PVB right when the mainline comes out of the house, not in the garden where it could get damaged by shovels and tillers in the garden.

The following picture is how I install my PVB's:
<img src="http://www.lawnsite.com/attachment.php?s=&postid=296915" border=0>



Edited by - RVLI on May 17 2003 10:06:46 PM

Rays Sprinklers

Supreme Member

Posts: 493

Location: USA

5

Thursday, May 22nd 2003, 4:47am

Oh,,,, you can do that too........In my area the mainline is in the ground because we dont have basemens. Thats why i suggested in a garden, because you wouldnt want that up on your lawn.

Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers
Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers
Rate this thread