end of main vent(s)

Luv'nsteam

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

RAF

Might want to take a look here.

Hoffman Specialty

Literature

Steam System Manual

HS-901A

Page 10

Hope it helps

Luv'nsteam

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,



Mike

Steamhead

How long is your steam main

and what pipe size is it? 

Luv'nsteam

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,



Mike

Luv'nsteam

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,



Mike

Luv'nsteam

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,



Mike

nicholas bonham-carter

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.--nbc

Luv'nsteam

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,



Mike

Steamhead

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?

Luv'nsteam

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,



Mike

Steamhead

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.

Luv'nsteam

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.



Mike