Sream quick vents

RonWHC

stop short of the ceiling? Or, do they penetrate the ceiling? If they go thru the ceiling, open it up & take a look. You might have a dead man moment. Frank is "dead" on.

Can't picture a 15 story vacuum system w/o a pump of some kind in the basement. Old vacuum systems leak enough. Vents only add to the problem.

Jim Branson

Steam quick vents

Dan makes reference to "Quick Vents" in Lost Art, with no mention of model numbers or manufacturers. I'm working on a two pipe project where there are fifteen story (150 feet) 3 inch vertical risers and they currently have Hoffman #43 vents. This is also the maximum height space available. The air is the risers aren't venting fast enough causing over heating on lower floors and freezing upper floors. Please advise me of a quick vent that I could try, keeping in mind I only have a 1/4 inch npt port and a height restriction as before mentioned.

Steamhead (in transit)

You need more room than that

by my calculation each of those risers needs four Gorton #2 vents. Maybe you could drill and tap slightly lower, to give you the needed headroom?

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Jim Branson

That's a thought, drill a new tap. Where do I purchase that vent?

Steamhead (in transit)

If no one handles Gortons in your area

try State Supply:

www.statesupply.com

The #2 isn't cheap, but it out-vents everything else on the market. We use lots of them.

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Jim Branson

I'll look into them. You said I should use four vents on one riser. I have a two pipe vacuum system. I'm only using 2.5 lbs of steam.

Steamhead (in transit)

Vapor or vacuum?

If it's a vacuum system with a vacuum pump, main vents aren't the way to go. You'd need to use a crossover trap between the riser and the return so the pump would suck the air out via the return.

If it's a Vapor system with gravity return or a condensate pump, then the main vents will do the job- most likely on much less pressure.

If you're not sure, take some pics and post them here!

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V8toilet_3

This chart would help you figure venting capacities because it list just about every vent on the market and it's venting capacity. http://www.heatinghelp.com/shopcart/product.cfm?category=2-138

Jim Branson

Risers

They stop short of the ceiling. There is a vacuum system that I installed in the basement. I converted this building from what I think was an old Dunham Return System with a wet return. We installed F and T traps on all of the ends of mains. Hence creating a dry return enabling the Vacuum system to draw on all the main returns and radiator returns. Each radiator has its' own element style trap. Things have been going pretty well so far. The fifteenth floor radiators get warm and the resident says that the rooms are cold. Not my experience though, Actually thought it was warm to hot. The riser that come thru the floor and continue to just short of the ceilings were cold until I removed the vent, then I got a short burst of pressurized air, then vacuum, then air pressure, then steam. And the riser got hot. Although the radiators, which are at floor level, were hot already.the other issue in the apartment rooms was the design of the radiator cover. There is no gap at the bottom which would help air flow for better circulation in the room.