T&P VALVE SIZING

JP

I HAVE A CHURCH THAT WE WERE CALLED IN ON THAT HAS FIVE 300,000 BTU SLANT FIN BOILERS ALL TIED IN TOGETHER. MY QUESTION IS EACH BOILER HAS ITS OWN T&P VALVE SIZED FOR THE BOILER. DO WE NEED TO PUT IN ONE LARGE T&P VALVE TO HANDLE THE WHOLE SYSTEM OR LEAVE IN EACH ONE AT THE BOILERS. SOME ARE BLOWING OFF AT DIFFERENT PRESSURES. ANY HELP WOULD BE GREATLY APPRECIATED.

Alan(CaliforniaRadiant)Forbes

Must be

a large church.

As far as I know, a system such as yours is only required to have properly sized relief valves for each boiler; that is, each relief valve needs to be sized for the input of the boiler it is serving, i.e. 300,000 BTU's if that is the rated input (not output).

I don't think an additional relief valve for the total system is required.

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flange

what you have should be okay, except if there is a valve between the mains and the expansion tank. in that case you would need to have one there as well. your local boiler inspector would probably be willing to help, and you already pay him via taxes. ours around here are pretty good if you can get them on the phone.

Mad Dog

I would treat them individually, as well

and....given that are blowing off at will, individualy, they should be treated as such. Mad Dog

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Tony Conner

I'd Check...

...with the manufacturer to ensure that what you actually have on each boiler is, in fact, the correct relief valve for that particular boiler. I've seen lots of people do some very "interesting & creative" things with safety and relief valves. I'd guess that the chances of any single one of the boilers in this church having the right relief valve on it would be no better than 50-50.

sebast

Would like to help you but not enough info? How big is the header piping? where are the pumps located?

JP

Thanks for the replies everyone. This church is a mess. All five boilers are tied in together to 4" supply and return mains (part of wich someone used sprinkler piping on). No primary/secondary pumping. Each boiler has an extrol 30 tank,2 pump on the return (B&G 1522)someone tried to zone out the churh and added 1" Taco zone valves to all of the mains. No bypass vlaves or pressure valves. On many occasions they may have one 3/4" zone valve open with no means of bypass and 1.5 mill btu's burning. We have alot of work to do on this system. Just hope they want to have the system work correctly.

Al Letellier

safety valves

I trust that was a typo about the kind of relief valve. A T&P should never be used on a boiler. It's a water heater safety valve. You only need safety vavles on the vessels, not the piping.

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