Steam main venting

Chris Jones_3 · November 2006

I have been reading the wall for several years, just bought a house in S. Vermont with steam heat. I have a one pipe steam system with two mains each approx 45 feet long, 2.5 inch o.d. pipe. They currently have Dole #4 main vents at the end of the mains. One of these main vents is not venting, the other works. What size vent do I replace the non-working vent with? Is the #4 appropriate for the size main? My other question involves venting radiators, in rooms that overheat I have adjusted the Dole adjustable vents to lower venting settings and this is causing some whistling. Is this normal?
Thanks Chris

Chris Jones_3 · November 2006

Steam Main Venting

I have been reading the wall for several years, just bought a house in S. Vermont with steam heat. I have a one pipe steam system with two mains each approx 45 feet long, 2.5 inch o.d. pipe. They currently have Dole #4 main vents at the end of the mains. One of these main vents is not venting, the other works. What size vent do I replace the non-working vent with? Is the #4 appropriate for the size main? My other question involves venting radiators, in rooms that overheat I have adjusted the Dole adjustable vents to lower venting settings and this is causing some whistling. Is this normal?
Thanks Chris

Steamhead (in transit) · November 2006

Both your mains

should be vented with a Gorton #2. This is a much bigger vent than the Dole #4, which is positively Lilliputian.

Your overheating rooms are the ones closer to the boiler, right? Once the Gortons are installed, you shouldn't have this problem.

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Steam main venting

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