steam boiler flooding

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Old 12-02-08, 08:45 PM
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steam boiler flooding

About once a week my 2 pipe system floods. I just replaced main vents to no avail. Have low water cutoff on order. If that doesn't work plan on replacing water feeder. Any suggestions?????
 
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Old 12-02-08, 11:07 PM
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Before you change the automatic feeder shut off the valve that "Feeds the feeder" and monitor your system daily for the next week. In many instances the return line on a 2 pipe steam system will become plugged up with gunk and it won't allow ( Or slowly allow) the condensed water to return to the boiler. When this occurs the automatic feeder will do its job and introduce fresh water into the system which will bring the water level up to the required level. As the return water slowly migrates past the plugged return line it will raise the water level in the boiler which will result in an overfilled condition.

If this is the case, the only remedy would be to disasemble and clean the return line feeding the boiler.
 
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Old 12-03-08, 07:01 AM
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If you have a two pipe system you probably have a dry return. This will drop down below the water line in the boiler room. What type LWCO and feeder do you have. How long has it been installed?
Is there a domestic hot water coil in the boiler? Is there a manual fill line piped around the auto feeder?
 
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Old 12-03-08, 08:26 PM
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Originally Posted by rbeck View Post
If you have a two pipe system you probably have a dry return. This will drop down below the water line in the boiler room. What type LWCO and feeder do you have. How long has it been installed?
Is there a domestic hot water coil in the boiler? Is there a manual fill line piped around the auto feeder?
McDonnell Miller model 67 lwco and mm unimatch feeder. Yes there is a manual fill line around the feeder.
 
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Old 12-03-08, 08:31 PM
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Originally Posted by lightsout06810 View Post
Before you change the automatic feeder shut off the valve that "Feeds the feeder" and monitor your system daily for the next week. In many instances the return line on a 2 pipe steam system will become plugged up with gunk and it won't allow ( Or slowly allow) the condensed water to return to the boiler. When this occurs the automatic feeder will do its job and introduce fresh water into the system which will bring the water level up to the required level. As the return water slowly migrates past the plugged return line it will raise the water level in the boiler which will result in an overfilled condition.

If this is the case, the only remedy would be to disasemble and clean the return line feeding the boiler.
If that was the case wouldn't it happen on a more consistent basis rather than just once every week or so? I check the level several times a day and always seems normal except for the once a week or so. Don't know, just asking!!
 
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Old 12-03-08, 11:06 PM
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If you could, please post some pics of your the boiler, boiler controls and piping. (Including the complete supply and return lines in the boiler room)
 
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Old 12-04-08, 05:59 AM
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Whats operating pressure does it see?

Whats the distance between water line and header?
 
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