Control valve

[Lamuppet]

First, I want to apologies for my English, it's obviously not my first language.

Here's my problem... I think I saw something about that in NFPA 13, but I search and I didn't find...

If I'm correct, the control valve (controling for exemple the water motor gong) should be after the pressure switch in such a way that the pressure switch shan't be isolated...

The matter is that I can't find this article in NFPA 13... Could someone help me, please....

 

[cdafd]

not really sure of your question,to many variables, if you have a copy of 13, there are pictures that show some riser details.

normally there is a main contol valve for the system

there should be no shut off valves going to a high pressure switch for a dry pipe system

yes the line to a water motor gong can have a shut off see 8.17.1.4.1 nfpa 13 2010 edition

if you want to restate your question please do.

 

[skdesigner]

Hi Lamuppet,

cdafd beat me to the code reference. In the 2013 edition of NFPA 13, 8.17.1.4.1 reads the same thing - "Where a control valve is installed in the connection to pressure type-contactors or water motor-operated alarm devices, it shall be of the indicating type."

8.17.1.4.2 states "Such valves shall be sealed, locked, or electrically supervised in the open position."



R M Arsenault Engineering Inc.

http://www.rmae.ca

 

[TravisMack]

I am going to make some assumptions:

1 - You are referring to a wet pipe system
2 - You are employing the use of a water motor gong
3 - You are additionally using a flow switch on the riser pipe or a pressure type flow switch on the alarm check valve trim

If these are correct, your control valve would be on the supply side of the alarm check valve. There may be a tamper switch on the control valve that would send an alarm if the valve is closed.

I hope this answers your questions, but I am not sure if I understood it properly. Feel free to email me direct with diagrams if you need more assistance.

Travis Mack
MFP Design, LLC

http://www.mfpdesign.com

https://www.facebook.com/pages/MFP-Design-LLC/92218417692

 

[skdesigner]

Travis - I suspect he is talking about the "silencing valve" in the alarm line, upstream of the pressure switch and water motor gong on a wet alarm valve. Believe 2002 was the first edition to contain the sealed, locked or supervised requirement for this valve.


R M Arsenault Engineering Inc.

http://www.rmae.ca

 

[Lamuppet]

Thanks to all of you. In fact, I was sure there was a part of the code that says that the silencing valve on the alarm line on a wet system shall be after the alarm pressure switch, in such a way that you can't silence the pressure switch... May be it's in some part of the CNPI (canadian regulation) or in a city regulation... 8.17.1.4.2 could solve my problem.

However, I thank you all... Charles