Deluge valve priming pipe connection and check val

[DavidCR]

In the supply pipe of a deluge system there is a check valve upstream the OS&Y control valve, the priming line pipe is connected between the check and the OS&Y. See the photo attached.

Is it OK? Is it adressed in NFPA or FM a requirement on this?
Or does it has to be connected upstream the check valve?.

The other question is if this check valve is a requirement or if this can be removed.

 

[cdafd]

not sure why the check valve should be there

The fdc is before the check valve right???

if so does not seem like the check valve is needed

would be nice to see more of the piping diagram


if the check valve is required than a valve has to be there so the check can be serviced.

 

[stookeyfpe]

I didn't see the check valve unless I'm missing something. I saw the check valve at the base of the riser, the OS&Y valve and the deluge valve.

If this is a diaphragm deluge valve, a check valve is required between the diaphragm chamber supply control valve and the diaphragm chamber automatic shutoff valve. The check valve I am speaking of ensures the air stay off (and the diaphragm stays open) when the valve operates.

 

[cdafd]

do you know what model valve it is??

 

[stookeyfpe]

I think it's a Tyco/Grinnell - and I found the check valve. It is at the very top of the galvanized pipe. I stand by my assumption.

 

[ryano669]

I think the fitting at the top of the galvanized pipe is a strainer. The location of the pilot line connection is acceptable, however I don't see the need for the check valve. Often times in a deluge system, when pressure is relieved from the supply line, the system trips when the header is repressurized. This is a result of the priming water bleeding off and not getting back up to pressure before the water hits the bottom of the valve seat. A check valve in the priming line would solve this, but is not shown. Possibly they chose to check the supply rather than just the pilot line.

I believe the valve Stookey refers to between the diaphragm chamber control valve and automatic shutoff valve is called a PORV or Pressure Operated Relief Valve. I do not see it in the picture. I would also like to see more of the piping detail.

 

[DavidCR]

Sorry I was out of the office. I went to the site and got a better photo of the system almost finished.
The valve is a Viking model E (4") with their "conventional" trim. The check valve a NIBCO swing FM-UL.

In the photo you can see more details.

The check valve is needed for the fire dept.inlet conn.
I would´ve preferred to install the prime line before the check valve, but in site they saw it easier to use the existing NPT outlet of the valve. And they are asking if it is OK.

 

[cdafd]

http://www.firequip.com.au/?main=/C...P)/?item=47EA3FC9-2048-46AC-9033-CB224E0675E9

is it installed per manufacuter instructions???

 

[cdafd]

try again:

http://www.vikinggroupinc.com/databook/deluge/valves/053096.pdf

 

[ContractorDave]

There is nothing wrong with that arrangement. We just installed a RPZ before a foam deluge system and due to the fluctuation of supply pressures installed a check valve before that also. Supply for the priming line originates after the RPZ. (Before anyone asks, yes the backflow and c.v. were taken into account in the calcs.)

Regards
Dave

 

[DavidCR]

I´ve already used this valve before.
I noted that the trim of the valve had a little modification but the accessories are on the correct position and place.

So for your comments it looks that the priming line with respect to the check valve is OK. Thanks to all for your comments and links.