Posted by Harold Kestenholz - Hydronic Network on January 10, 2000 at 12:31:30:
In Reply to: Re: Steam-Pressure Question posted by Frank on January 10, 2000 at 09:22:15:
When you raise the relief valve of the upstairs unit, steam leaves the boiler with some force. Insufficient steam generation would not leave enough force to cause the steam to leave the boiler with noticeable force. This leads to the probability that there is a main or radiator venting insufficiency. Removing the vent from the last radiator for one cycle to see if the steam will fill the radiator is one experimental means to assess the capacity of the pipes to carry sufficient steam to the radiator. Do not get in the way of the steam, even at low pressure it still scalds.