One or two pipe steam?

Chreamc

Trying to determine type of system I'm working on.

Radiators are two pipe, steam pipe comes in high, return line exits low with no steam trap.

Some radiators have air vents, some don't.

I have #75 Hoffman air vents on condensate return lines near boiler, also have bucket traps on same condensate lines.

What do I need to do to correct it?

I have always seen two pipe systems with traps at radiator with no air vents (on radiator) and one pipe systems using air vents on the radiator.

Steamhead

That's probably "Orifice Vapor"

unless there's something inside those radiator return ells. Post some pics of some rads so we can have a look.

Chreamc

One or two pipe steam

Picture attached.

Steamhead

Yup

doesn't look like anything but a standard return elbow. There are orifices in the radiator shutoff valves, so the steam will not reach the return lines unless the pressure gets too high.



This system needs a Vaporstat to control the boiler pressure, not the usual Pressuretrol. The latter cannot limit the pressure to less than 1 pound.



If you can find a radiator valve that someone hasn't slathered paint all over, see if you can see a name on it. Also take a picture of the boiler and surrounding area.

Chreamc

One or two pipe steam?

Thank you for the info. It will be a couple of days before I get back to this job for more pictures.