One-pipe Steam radiator gets hot only at top

Dot_2

One-pipe Steam radiator gets hot only at top the bottom stays cold, i have done the following to try to resolve the problem:



Cleaned out the radiator of any sediment

Changed the air vent

Made sure it has the correct pitch to allow the condensation to drain back towards the boiler.



But still it remains the same however all others heat properly.



If I take off the air vent then it heats up on both top and bottom, I am at a lose as to how to correct this any help would be greatly appreciated.

Charlie from wmass

What vent did you install?

They are not all the same, they very in size internally for different needs. Did you buy the new vent at a large box store?

Dot_2

One-pipe Steam radiator gets hot only at top

It's a Hoffman A1 air vent that I used.

Charlie from wmass

Try a different vent speed

pehaps slowing it down. Also is the valve supplying the radiator fully open?

Dot_2

valve supplying the radiator fully open?

Yes it is fully open as I was trying to simulate  what happened when the air vent was removed.



When removed it heated evenly.



I will try to slow it down to see what happens.

Charlie from wmass

A vent called a

Gorton C or Gorton D will vent faster the D being the fastest,

Charlie from wmass

What is

The pressure your boiler is running at? It should be 0.5 cut in for most residential one pipe steam systems.

Dot_2

Pressure is at about 1 psi

Slowing the vent down only made a slight difference so I'll try on of those other ones.



Will update post, thanks for the advice.

Dot_2

Cut-in

The Boiler shows the "cut-in" at 0.5 lbs while the "differential is "2.0 lbs.