Looking for photo of main vent on radiator riser

Steve Garson_2

I am helping out a single woman who is getting a new steam boiler. I noticed that there is no main venting on her one-pipe system. Part of her basement has finished ceilings, so it would be hard to find the end of the mains to tap for vents.

I recall seeing a post in the past of a main vent installed at the riser to a radiator. Does anyone know what the subject of the post is so I can share it with her contractor? Would installing a vent like this in a bedroom be a mistake, due to rushing air noise when the boiler cycle starts?

Thanks,

Steve Garson
Newton, MA

nicholas bonham-carter

If the main vent(s) are adequate in size, the air velocity should be very low, and quiet.
What is the size, and length of the main leading to this end radiator? One Gorton 2 will handle 20 feet of 2 inch line.--NBC

Steamhead

Look at our Find a Contractor ad.

Steve Garson_2

Thanks

Fred

Is this a single pipe sysem? That radiator would be the very first to get hot and probably would cause that room to be uncomfortable by the time the room with the Thermostat reached temp. Best thing to do is find a place at the end of the Main or somewhere along the return pipe in the basement for main vents. If it's a 2 pipe system, it may require a different approach, depending on the system type.

nicholas bonham-carter

I think it will be alright, as this main vent would be at the end of the line. The main will fill, followed by all the rads, more quickly.--NBC

dennis53

There is a sketch on page 118 in TLAOSH along with a discussion of Frank Gerety and 'master venting' that may be what you are looking for. Similar on page 133 of Greening Steam.
There is also a recent thread on venting risers.
Good luck!
http://forum.heatinghelp.com/discussion/152708/venting-mains-single-pipe-steam-system