Field guides
One-pipe steam venting guides
Short walkthroughs for the questions that come up on the job: how much air is in the main, what the ounce columns and clear-time minutes mean, how many main vents to hang, whether a radiator wants a Gorton C or a D, and why the thermostat-room vent should stay small. Capacities stay in the calculators — these pages explain the method and point you there.
One-pipe steam
How many Gorton #2 main vents?
Measure the main, convert pipe volume to a venting rate, then decide how many #2 (or #1) eliminators you need.
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One-pipe steam
Gorton C or D on a radiator?
Turn EDR and runout into a required CFM, pick C vs D from published capacities, and keep the thermostat radiator small.
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One-pipe steam
Don't oversize the thermostat radiator vent
Keep the thermostat-room radiator vent small so that room does not heat first and shut the boiler off while far rooms are still cold.
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One-pipe steam
Steam main air volume
Measure main ID and length, convert Schedule 40 internal volume to cubic feet of air, then feed that volume into main-vent sizing.
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One-pipe steam
Vent ounces and minutes
What the 1 / 2 / 3 oz pressure columns mean, why ~3 minutes is a common clear-time target, and how both feed the vent calculators.
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