A and B dimention

Mad Dog_2

and I don't know of a better man for steam in his parts. Mad Dog

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thfurnitureguy_4

A and B dimention

I was trying to explane the problems with joining multiple drips into a dry return to my heating contractor. I thought that it made sense to keep the drip returns seperate from each other by some type of water seal ( U or wet return). His answer is that all we need to do is u seal before the return reaches the main vent. I see how this would stop the steam from backing up the return and closing the vent but, This would leave no path for residual steam pressure back to the boiler. The return would have a U seal between the main and the boiler. The question is why do you need this steam pressure back to the boiler if you have an equalizer at the boiler? What is the A and B dimention in a 1 pipe steam system?

Steamhead

Think of a wet return

as a "U" seal. You have steam pressure at one end from the equalizer, and at the other end from the end of the steam main. The vertical dimension at the far end is the "A" dimension in this case.

The wet return in the boiler room would have steam pressure on it at several points: equalizer, drips from rads directly above the boiler room, and the existing dry return. If leftover steam pressure is eliminated from any of these, water will back up into it. This would turn the vertical dimension at the far end into a "B" dimension.

This is why, on your system, all connections to the existing dry return must go thru "U" seals, either individual or aggregated, to separate them from each other- except one of the two big ones. We need to keep the leftover steam pressure on the end of the dry return to prevent turning the "A" dimension in the boiler room to a "B" dimension, and giving that one main connection direct access to the dry return will do it.

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thfurnitureguy_4

I am a believer, I just spent an hour with the guy who's company helped me thread the u seal. He left with the look of what the h*// does the wood guy know. He lost me when he insisted that the venting was in the wrong place and it should be at the celing of the show room. It upset him when I asked how the steam would get to the end radiator that was located past where he wanted to relocate the main vent. His comment was "it will work"! It is no wonder that this system is such a cluster ----. I expect the no return call answer to my bid. He was, "all about" re-doing the header on the system. He did not know about a drop header except where head space was a problem. What has me in a pucker is that the system "kinda" works now. So why do I want to spend all of this money and not do it right? I e-mailed Dave Yates I didn't realize he was so close. I read his thread on starting a business. The guy has been through the shreader and held on to his stripes. He sounds like the right guy for the job. I hope he will call me. P.S thanks for taking the time to explain all of the physics of this stuff. I wish just one of these companies up here held the trade with the respect that you do.