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2 pipe system no traps 2nd floor low heat
Hi all, new member here, spent hours reading thru this site. It’s helped tremendously however need a little more help.
I have few questions about my 2 pipe steam system. Please bear with me as I am going to try and explain my unique system so that you guys have as much info to help answer my questions. If I put some wording in ( ) it’s only because I may not know correct terminology.
I have a 2” pipe coming off boiler which goes up about 3’ to a tee (header) for about 8’ per side which I’ll call east and west side. East and west side then have 45 elbows with close nipple to other 45 elbow to perform a drop to run under floor joists. Pipe is now 1 1/4” after the drop. East side has 2 radiators which come off (supply) steam side via a tee that reduces down to 3/4” pipe which is pointing upward. 3’ or so in length with elbow to steam radiator valve. East and west supply lines are pitched away from boiler. At the end of main there is a main vent about 8” above steam main. There is also a ( thermal disc) trap at the end of main that is plumbed into the (wet return).
Small side track, this system used to bang to no end. Not really knowing what I’m doing I decided on trying to rebuild (thermal disc) traps. I couldn’t find direct replacement or comparable replacement without have to re plumb half the system. So I took them apart to see if it’s something obvious wrong. Low and behold the west side trap had been gutted. The east side was complete but no matter what I tried that side banged bad while west side was quite. So I gutted the east side trap and banging is gone.
That being said this system has zero traps. However it does have vents, and lots of them. As stated before to at the end of the steam mains. It also has 2 (main vents) in the returns near the boiler pre Hartford loop. Each radiator has a vent as well.
So now my questions.
Any ill effects having main steam lines kind of feeding into the wet returns?
Because it’s a 2 pipe system do I need the vents on each radiators?
Because of this unique system can I throttle the inlet valves on each of radiators to balance the system?
The reason I ask is because the last radiator in the system on the west side only gets about 40-50% hot. If I crank the thermostat up to 74 then all is good. But under normal load the furthest radiator gets little heat. On that note I believe it’s not plumbed correctly. It’s feed off the very end of the 1 1/4” main choked down to 1/2” for an unknown distance, it is on second level so if I had to guess I’d say 8’ or so and also un insulated as well.
I also have on the west side the first plumbed radiator, pretty much off of the boilers header which goes to second floor but again I believe it’s not plumbed correctly. This one someone has changed plumbing over to 1/2” copper pipe, feed and return. In basement the feed side obviously gets hot and return is cool. Up stairs the radiator get hot on the return side. Not sure if they flip the pipes during whatever it is they did or not. It must of been known problem because they moved the vent to the valved/feed side. I’m also wondering on proper water level in the boiler. 24” from floor? X amount over (boiler plate)? 1-2” over Hartford loop?
I can’t find anyone to work on this system and I’m starting to get feed up. If someone can shed some light and help me. It would be greatly appreciated.