Best Design for an Outside Steam Vent
Best Design for an Outside Steam Vent
(OP)
We currently run a steam ejector to evacuate an evaporator system. The exhaust for the ejector is vented out the wall horizontally, and sprays steam and condensate all over.
I am going to turn the vent vertically up, and leave a drain leg on the vent. I am wondering if there are rules of thumb for running a vent of this type. Is it better to just run the steam pipe into the center of a reducing tee, with the large end pointed up and the small end run to the ground?
We are in Ohio, so we get cold weather, is heat trace/insulation necessary for the drain leg?
Any advice is appreciated.
I am going to turn the vent vertically up, and leave a drain leg on the vent. I am wondering if there are rules of thumb for running a vent of this type. Is it better to just run the steam pipe into the center of a reducing tee, with the large end pointed up and the small end run to the ground?
We are in Ohio, so we get cold weather, is heat trace/insulation necessary for the drain leg?
Any advice is appreciated.





RE: Best Design for an Outside Steam Vent
I've seen a diary operation where they were actively considering tearing out a perfectly good ejector system, and replacing it with mechanical vacuum pumps. The only thing I could see wrong with the existing system was that the control valve for the cooling water to the condenser was seized in an almost fully closed position. Of course, the engineer for the vacuum pump company insisted that the steam condenser was a restriction in the exhaust. The idea that steam collapsing into 1 / 1700th of it's volume when it condenses was apparently not relevent - at least to his being able to close the sale for his product.
RE: Best Design for an Outside Steam Vent
RE: Best Design for an Outside Steam Vent
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or you could use a steam exhaust head....
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You might get some benefit by routing your drain line attached to your steam vent where possibly but otherwise I would think you would at least need to provide insulation for freeze protection and/or personnel protection.
RE: Best Design for an Outside Steam Vent
If steam clouds at ground level will be a problem, a p-trap in the drain line would force all vapor to exit out the top. The trap would probably require freeze protection.
RE: Best Design for an Outside Steam Vent
rmw
RE: Best Design for an Outside Steam Vent
RE: Best Design for an Outside Steam Vent
RE: Best Design for an Outside Steam Vent
If there is no sump/hotwell, you are best off pointing the discharge upwards, and then have a drain off the bottom. Make sure the drain is always opened in case of rain. Pointing the ejector upwards is also best for lowering the noise level.
I don't see any advantage to using a reducing tee, but heat tracing the drain may be a good idea because the flows will be very low and could freeze. But I have no experience with freezing there.
RE: Best Design for an Outside Steam Vent
I think Wright-Austin also has suitable vent caps.
rmw