Re: hissing steam radiators
Posted by e-plumber on December 04, 2003 at 09:34:07:
In response to Re: hissing steam radiators
: : Reply:
: : The rust colored water is probably just what got stirred up while you were refilling the boiler after the piping replacement.
: : The hissing noises could have been wet steam that was brought up the the rads when the boiler water level was slightly high.

: Ok, thanks. Is there any way to get this wetness out of the system and stop the hissing?

: : The inoperable rad could have a defective air vent, shut off valve or the piping could have sagged in the floor and is holding water preventing the steam from entering the rad.
: : Rarely does steam piping become blocked with crud.
: : Good Luck. e-plumber

: That's great to know, I'm so glad I didn't take it apart to check, or worse yet, have it replaced.

: I'm unsure as to how this type of heat actually works. When steam comes up into the radiator, does the air in the radiator escape through the air vent? Maybe that's the hissing I'm hearing. If that's how it works, why doesn't steam come out of this vent? Or am I wrong on this? Does the radiator vent each time it comes on, or is the vent only for overload/pressure safety?

: Thanks again
: Rob

If the water level in the boiler is normal, just run the systen as you normally would. The hissing sound is normal, it is the rising steam forcing the air out of the piping and radiators, once the steam reaches the air vent it stops releasing air automatically. It will do this every time the system is running to produce heat. It has nothing to do with excessive pressure.
Good Luck. e-plumber

Replies to this post
There are none.