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Questions on venting

CaptPaul Member Posts: 14
I have just started taking care of an oil-fired single pipe steam system with an old but dependable boiler. I can find no vents other than those on the radiators. The current air valves are mis-matched. A couple of them hiss. I have only 5 radiators all of which are old tube type. I have basically 1 small (23” with 7 sets of 4 tubes) and 4 large (38” and between 7 and 9 sets of 5 tubes). The thermostat is in the room with the largest radiator. The boiler is in the middle of the hour with radiators on the perimeter. They are basically equi-distant from the boiler.
I am looking for input as to how to determine what valves I should buy. I’m thinking maybe something like 3 Gorton #5’s and 2 #4’s for the small radiator and the thermostat room. I’m also thinking maybe adjustable valves on all 5.

Also, can I or should I think about putting venting on the lines?

Any input would be greatly appreciated.


  • jhewings
    jhewings Member Posts: 139
    I suggest you consider adding main venting and make sure your operating pressure is below 2 psi. Consider insulating the mains if no insulation. Then maybe change your radiator vents if necessary.
    EBEBRATT-Ed Member Posts: 15,829
    I agree with the above post. Main venting was sometimes not used when burning coal. Adding vents will probably save some fuel