Steam not getting to risers

Larry_6

I have a one-pipe system and these two risers are closest to the end of one (2") main pipe. The last one serves a 16" x 9" x 37" radiator in my kitchen. From the T on the main which is extremely hot, there's a 6" vertical nipple elbowed to approx. 3' horizontal pipe elbowed to the riser (3/4") and valve. The steam seems to make it a few inches into the 6" vertical nipple (1" diam). Radiator is cold.

The other situation is wierd because I just installed pipe to a small bathroom that had steam heat at one time in the past put it had been removed for some unknown reason. I noticed a T in the main pipe close to the bathroom and the hole in the floorboard for the riser which had been tiled-over. I ran 1" pipe from the main via horizontal, then vertical, then direction change Iit's close to the building foundation) horizontal to a 3/4" riser. After initial install I was excited because the steam very quickly got to the radiator. The heat generated did seem damp however. A few days later, though, and the steam is only getting part-way through the new piping to the riser, and the radiator is cold. Is this a simple pitch problem on the 2nd horizontal section of my feed pipe to the riser?
Finally, I've been reading about needing main vents near the end of the main. My piping doesn't have these vents but plenty of steam seems to get to the end of this main, just not all the way to the riser as I explained above.

Thanks for any suggestions.

ed wallace

no steam

on the 2 rads are they pitched so that vent end of rads are lower than inlet end? are air vents good? are valves new?

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Steamhead

and

are the pipes pitched so water will drain out of all of them and back into the steam main?

I would certainly install properly-sized main vents. The entire system will heat faster, and on less pressure. Both considerations will lower your fuel bill.

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Boilerpro

and

does the boiler have a reasonably long run time? The thermostat anticipator may not be set correctly...very few are in my parts. Too short of a boiler run time does not allow steam to distribute well....acts like there is not enough main vents.

Boilerpro

Unknown

No steam in the riser

The riser with problem, is that the 3/4" riser?

If it is, in one pipe steam the smallest riser permisible is 1" pipe. That 1" pipe will serve a radiator up to 25 EDR. Larger than that you will need an 11/4" riser.

Remember the steam goes up the pipe and water comes down the same pipe. You the space for both water and steam to flow.

Additionally make sure that the pipe athe base of the riser has pleanty of pitch and is at least the same size as the riser.

Jake

Unknown

No steam in the riser

The riser with problem, is that the 3/4" riser?

If it is, in one pipe steam the smallest riser permisible is 1" pipe. That 1" pipe will serve a radiator up to 25 EDR. Larger than that you will need an 11/4" riser.

Remember the steam goes up the pipe and water comes down the same pipe. You the space for both water and steam to flow.

Additionally make sure that the pipe athe base of the riser has pleanty of pitch and is at least the same size as the riser.

Jake