Hi PSI goes to Lo PSI

Bill_6

I was looking more closely at my column rads. They are not connected across the top.

Since the steam cannot push the air up the column, across the top and out the vent, it seems to me that it would just roar across the bottom and up the last section to the vent, leaving the first sections cold or warm.

But what happens is that the first sections do get hot and the last sections only get hot if it's real cold out.

Now I don't understand that !

Ken_8

Bill,

The steam is 212. The air (initially) ambient @ 70°?

Guess which is lighter? Guess which will displace which?

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Al Letellier_9

variation in section temps

That happens because the system is designed properly and the vent is working correctly. A radiator should get hot all the way across only on/near a design temp day...don't "knock" it !!!

Steamhead (in transit)

And

it doesn't roar across the bottom because the nipples across the bottom are light-years bigger than the opening in the air vent. So there's no velocity there.

They're classic steam-pattern column rads- still working after all these years, when so much newer stuff has long since worn out.