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end of main vent(s)

Luv'nsteam
Member Posts: 272
Once I figure out how much venting I need, where is the best place to put them- at the end of the main (top-left) before the first "T" or near the end of the dry return (the short nipple below the "T's")? Keep in mind, it appears I will be completely dissembling what you see and redoing it in larger pipe to handle the EDR I am running through it, so where ever is best, is what I will do.
Thank you,
Mike
Thank you,
Mike
0
Comments
-
Might want to take a look here.
Hoffman Specialty
Literature
Steam System Manual
HS-901A
Page 10
Hope it helps0 -
Hoffman specialty
I did look. What is a high pressure vent and what is its purpose?
My system, when complete, will run on vapor, so do I even need a high pressure vent?
Thank you,
Mike0 -
How long is your steam main
and what pipe size is it?0 -
Length of main
Total measurable length of main is about 11 1/2 feet at 1 1/2" diameter.
It has two ells at 90* that add a frictional equivalent of 7 more feet.
Do frictional allowances matter when figuring venting?
Thank you,
Mike0 -
Venting needs
Looking at the Gill/Pajek "Venting Steam Systems Using A Capacity Chart", and if my math is correct, the above main has 0.161 cubic feet of air to vent (not including frictional equivilents). To vent that volume of air in 3 minutes (arbitrary figure from chart text) I would divide that number by three(minutes) and size the venting pipe and vent accordingly.
If so, then I could use 1/8" pipe and a single Dole #5 Quick Vent, but would likely use a Gorton #1 and 1/2" pipe to vent this main in three minutes (or less).
Noting I am using all math for this, these numbers do not make sense in my head. Am I doing this correctly?
And what is the best location for the vent?
Thank you,
Mike0 -
Steamhead,
Have you had an opportunity to see my answers to your questions?
Is my math correct or am I not smarter than a fifth grader? :~)
Thank you for the help,
Mike0 -
venting question
i don't think that the dry/wet return will have to be changed because of the EDR of the system, as only the steam-carrying pipes are effected. you could certainly put the vent on the horizontal [mounted up as high as your ceiling allows]. that nipple could be easily removed with the classic "thread-collapse" treatment, with a hacksaw cut through the pipe close to the fittings on both ends. then the stubs, sticking out of the fittings [1/4 in.] can be cut from inside towards the threads of the fitting , very carefully so as to weaken the remains of the pipe, without cutting into the threads of the fitting, and to enable its collapse using a hammer and punch. i have a few bracelets left over from that operation still hanging on the wall!
don't skimp on the main venting. if you think you need a gorton #1, then get a #2. remember, you can never have too much venting!!!!!!!!!!!!!!!!!!! just as your pressure can almost never be too low.--nbc0 -
vent size & location
I am replacing all of the wet returns and some dry returns, so if adding a vent(s) at the end of the horizontal return is the best location, that is where I will put it/them.
Per pexsupply.com, a G1 costs $19.00 and a G2 costs $53.00 (retail). If a G1 will vent all of my air quickly, because of the cost difference, that is what I prefer to use. I am not being cheap, I just do not want to spend more money than I have too. I am also "king-venting" at least two risers from this main, so that should take care of any air in the up-feeds. I have another, larger, main to vent as well and I may "king-vent" some of the risers off that main, too. So I will be purchasing several more vents.
Now that you know all of this, does that change your suggestions at all?
Thank you,
Mike0 -
For a main described as
"11 1/2 feet at 1 1/2" diameter", you don't need much venting. A Hoffman #4A will do, or a Gorton #6.
Installing the vent at the end of that miniature horizontal dry return is fine.
Is that the only steam main in the system?0 -
another main
The main at 11 1/2 feet in length and 1 1/2" ID is the second and smallest main (more like a horizontal run-out?). Is this an incorrect description??
The other and larger main is 2" and without fittings is approximately 30 feet in length, parallel-flow before changing into, well, I guess you would call it another horizontal run-out that feeds one rad, is counter flow and is 9' 6". There is a condensate return a few inches before this intersection of main & run-out and the pitch changes here as well. I can provide a digital picture if you like, as my description does not seem very good. Also, I have a colored drawing of the entire system I can upload, if that will help too.
Thank you,
Mike0 -
That longer main
is where you'd install the Gorton #2. It could go near the intersection of the parallel-flow and counter-flow mains.0 -
Gorton #2 location
Will do. Thank you Steamhead and everyone else who has helped. I cannot wait to complete this, test it, and post pics.
Mike0
This discussion has been closed.
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