Code question

Pstef

As I explained earlier the feed and return are piped as a loop with one circulator in that loop. The Zones are fed off the loop with each zone having isolation valves on the feed and return lines to the loop. Would this satisfy the code requirement of isolating the boiler?

If indeed whenever the boiler needed service to the wet end the isolation valves on the zones could be closed and then the only drain down would be the boiler and loop, not any of the zones. I would really like to be able to keep existing set-up due to LWCO being on the highest point of the loop. To me this offers the greatest protection for the system, boiler should never dry fire. If isolation valves need to be closer to boiler, to isolate loop from boiler then I need to move the LWCO to a lower level on same plane as feed line, I'm sure it is still within min. safe water level, but why just work to minimum, when I can add an additional level of safety (increased amount of water available to boiler even with LWCO activated)?

Thanks everyone

Pstef

Ball Valves on return as well as feed?

I have a question concerning the requirements for isolating the boiler from rest of system?? I just had a new system put in my home with a Crown Freeport ODV, feed is out the back offset to one side, transitions from black pipe to ball valve to 1-1/4" copper for a loop that feeds the other zones of the home. Following the ball valve is an expansion tank then the Spirovent the make-up water tap the directional valve and then the LWCO, at highest point in loop, then the taps for the zones and finally the circulator and then the loop returns to the bottom of the boiler. I had a rough inspection today and the inspector told me that I had to have another ball valve located on the loop before the circulator. He indicated that is was required by Mechanical Code. I am concerned, if another valve included at a point anywhere in the loop the boiler can be put into a dangerous operating situation. If both valves are closed the boiler will be a sealed system with only the T&P valve to allow escape of pressure and or temp(if override). Then the boiler could in affect steam off water to a point where catastrophic failure occurs, since the LWC is located above in loop that has been isolated. Is there a requirement for two valves in system to isolate the boiler? I guess the LWCO could be moved so it is in feed line before the valve, but I don't understand why even do something that could be problematic. Thanks for any responses

Paul

Tony_8

LWCO

must not have a valve between it and the boiler. Same with he relief valve, which by the way, is not temp activated but pressure only. It should be in the boiler's installation instruction manual.

Robert O'Connor_7

Pstef....

2000 International Mechanical Code, Section 1005 Boiler Connections. 1005.1 Valves. Every boiler or modular boiler shall have a shutoff valve in the supply and return piping. For multiple boiler or multiple modular boiler installations, each boiler or modular boiler shall have individual shutoff valves in the supply and return piping...Exception: Shutoff valves are not required in a system having a single low-pressure steam boiler.
Robert O'Connor/NJ

[Deleted User]

Think like

a service tech. Install the valves (2) to isolate the boiler, and the serviceable equipment, so all of it (LWCO too) can be replaced or repaired w/o draining the system. Then we can all eat hot suppers.

[Deleted User]

Think like

a service tech. Install the valves (2) to isolate the boiler, and the serviceable equipment, so all of it (LWCO too) can be replaced or repaired w/o draining the system. Then we can all eat hot suppers.