os&y gate valve

[zicoo000]

At the base of each riser we put os&y gate valve and tamper switch ??????
please advice

 

[TravisMack]

What is your question? Yes, you want a system control valve.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

 

[cdafd]

you normally need an indicating control valve for the riser

does not have to be osy

 

[chicopee]

You would have two OS&Y gate valve and in between them you would have a back flow preventer, at least in the USA.

 

[TravisMack]

Chicopee: A backflow preventer is not required in all jurisdictions. Just an FYI.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

 

[chicopee]

I was of the opinion that the EPA did not want potential water supply contamination and therefore requiring all communities to have backflow preventers at least on new installations.

 

[TravisMack]

There are quite a few in this area that do not require a double check assembly. These AHJ's just require a single check on the riser or on the incoming fire line.

It surprised me as well when I moved to this area many years ago.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

 

[3cio]

hi Guys!

zicoo000 , As per NFPA-13 8.16.1.1.1.1, each sprinkler system shall be provided with listed indicating valve in an accessible location, so located as to control all automatic sources of water supply. Further, not necessarily you need a tamper switch but you must satisfy one of the requirement with reagrds to supervision. go through NFAP-13 8.16.1.1.2.

PS. NFPA-13 2010 ed.

hope it helps,