"Banging Radiators"


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Old 10-13-07, 07:20 PM
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"Banging Radiators"

Hello. I'm new to this site. Here's my problem: The radiators in my house always bang during and shortly after the boiler is running. I bleed the radiators regurally and sometimes a small amount of air comes out of 2 of them. But other than that no air comes out at all. Any suggesstions? Thanks
 
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Old 10-13-07, 07:30 PM
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Steam or hot water?

Is the system steam or hot water?
 
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Old 10-13-07, 08:19 PM
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it's a hot water system
 
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Old 10-14-07, 07:33 AM
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Originally Posted by kingjim9
it's a hot water system
Is the boiler staying at a steady pressure?
Is air getting into the system?
Could it be piping in the outside wall? Hot pipes meeting cold air can cause a bang.
 
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Old 10-14-07, 08:06 AM
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Noise

By the term "radiators" do you mean cast iron radiators or finned copper tube in a metal cabinet?
 
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Old 10-14-07, 12:36 PM
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They're Cast Iron Radiators. And When the boiler isn't running the pressure is about 20psi and after it runs for a cycle it climbs to about 24psi. I'm not sure how to determine if it is getting air in the system.
 
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Old 10-14-07, 05:15 PM
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System Pressure

That's a lot of pressure for a house. I doubt the pressure has any thing to do with the noise but I suggest dropping the cold pressure to 12-15# & see if it makes a difference.
 
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Old 10-14-07, 08:56 PM
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how should i drop the pressure to 15? Should i just release water from the system?
 
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Old 10-15-07, 03:25 PM
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Pressure

There should be one or more hose bibs on the boiler or near the circulator(s). Just open one & drain water into a bucket.
 
 

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