Leaking air vent, rusty water

Users who are viewing this thread

Artm69

New Member
Messages
14
Reaction score
0
Points
1
Location
Boston, MA
On my 25 year old Burnham boiler, suddenly an air vent developed a leak. as seen in the pics, the water is quite rusty. How should I proceed with this repair? Replacing the vent should be straightforward but what about the rusty water? I fear that may be a bigger issue.

The boiler has never been drained for maintenance. The only issue was an expansion tank replaced twice over the years.
 

Attachments

  • leaking-vent1.jpg
    leaking-vent1.jpg
    58.5 KB · Views: 82
  • leaking-vent2.jpg
    leaking-vent2.jpg
    57.3 KB · Views: 75

Fitter30

Well-Known Member
Messages
4,579
Reaction score
867
Points
113
Location
Peace valley missouri
Has the boiler had a lot of makeup water added to it over the years? Make up water contains oxygen and that isn't good for a boiler system causing rust in the cast boiler sections and steel piping. The air vent just unscrews replace it. Drain and refill boiler and drain again. Add boiler treatment to the system then refill. Can add treatment by pulling the relief valve. With boiler is drained look to see if the boiler gauge (tridicator) goes to 0 and the temp looks close.
 

Artm69

New Member
Messages
14
Reaction score
0
Points
1
Location
Boston, MA
1. I'm sure plenty of added water has come in over the years. I thought nothing of it. Which boiler treatment is recommended?

2. Some more symptoms , weird:

3. Circulator on, heat on, outgoing pipe past exp tank gets hot, and is so for many feet.
4. Return pipe before circulator, and many feet before, is cold.
5. Turning off system, pipe before circulator gets hot.

6. Pressure is low at 5 when off. When hot, gets to 10. When I press valve to increase, nothing happens, I don't hear any water coming in.

This boiler is in basement, going up one level only and has only one circulator.
 

Reach4

Well-Known Member
Messages
39,277
Reaction score
4,539
Points
113
Location
IL
If your auto fill valve does not leak, and if your boiler pressure relief valve is proper, and if you have a working well-sized thermal expansion tank, then adding water should not be needed.

Thermal expansion tank air precharge should be the same as your refill pressure, which is often around 12 psi.
 
Last edited:

John Gayewski

In the Trades
Messages
4,548
Reaction score
1,449
Points
113
Location
Iowa
If I were you I would use the lower drain on the boiler and blow out the rust. Refill with some treatment.
 

Artm69

New Member
Messages
14
Reaction score
0
Points
1
Location
Boston, MA
1. Yes, on lower drain to blow out.

2. What treatment to use?

3. Refill pressure: is 12 psi a standard rule irrespective of the height of water travel? I've been running 20 psi for units 2-3 floors up, form basement. This unit is only one floor up.
 

John Gayewski

In the Trades
Messages
4,548
Reaction score
1,449
Points
113
Location
Iowa
1. Yes, on lower drain to blow out.

2. What treatment to use?

3. Refill pressure: is 12 psi a standard rule irrespective of the height of water travel? I've been running 20 psi for units 2-3 floors up, form basement. This unit is only one floor up.
Yes 12 to 15 psi cold. It'll rise a little as the system heats up. Any rust inhibitor

 

John Gayewski

In the Trades
Messages
4,548
Reaction score
1,449
Points
113
Location
Iowa
The rust could've just been from your air separator. When you let out from the lower drain see if there's rust. If there's only a tiny amount you might want to think about changing to a spirovent. They are better anyway.
 

Artm69

New Member
Messages
14
Reaction score
0
Points
1
Location
Boston, MA
So, drainded boiler, fairly clear, changed air vent and autofill valve. All looks good. Autofill was clogged, thinking of rebuilding it as a spare. It's a basic 1156, worth it?
 
Top
Hey, wait a minute.

This is awkward, but...

It looks like you're using an ad blocker. We get it, but (1) terrylove.com can't live without ads, and (2) ad blockers can cause issues with videos and comments. If you'd like to support the site, please allow ads.

If any particular ad is your REASON for blocking ads, please let us know. We might be able to do something about it. Thanks.
I've Disabled AdBlock    No Thanks