Remove rusted expansion tank


  #1  
Old 01-02-20, 02:48 PM
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Post Remove rusted expansion tank

Today I started the process of removing my old expansion tank and the damn tank appears to be rusted. Not having any luck getting that tank to budge when trying to remove from air separator. Any suggestions on how to get the tank off? I'm afraid I'm going to break something. Thanks for any help!
 
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  #2  
Old 01-02-20, 03:55 PM
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Try two pipe wrenches, torqueing in opposite directions.

Why are you replacing the tank? Because of rust? Can you provide a better pix of the rust? A bit of rust on the shell of the tank probably wouldn't be a significant problem.
 
  #3  
Old 01-02-20, 04:39 PM
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Oh, I mean the threads are rusted in the air separator so it isn't breaking loose when trying to spin it off. When someone installed it they didn't use thread tape.
 
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Old 01-02-20, 09:11 PM
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Ah, think maybe I should have asked is there any tricks or tips on loosening pipes with rusted threads. I can't believe they didn't use thread tape or pipe dope. And just to add to my misery, I see my fill valve threads are all rusted too and that fill valve I just determined is not holding steady 12 psi. Damn.
 
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Old 01-03-20, 06:43 AM
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Assuming that the first expansion tank is not leaking, you can leave it there and install a second expansion tank, space permitting, and that will fix pressure problems associated with expansion tanks.

Then remove the first expansion tank at your leisure.
 
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Old 01-03-20, 07:05 AM
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Get some liquid wrench.
Squirt some up onto the threads.
Then take a strip of cloth tie it around the pipe push it up to the threads and soak it with liquid wrench.
You could also tie/tape a plastic bag around the pipe and tank fitting to keep it from dripping and keep moist etc.
Give it a couple days and try again to remove the tank.
 
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Old 01-03-20, 11:19 AM
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Thanks for the cloth/liquid wrench suggestion! Going to try that and give another attempt to remove it in a couple of days.
 
  #8  
Old 01-03-20, 12:52 PM
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It looks like the source of your rust is a water leak from the air vent. Look at the rust track going down the air scoop.
 
  #9  
Old 01-03-20, 03:23 PM
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If you cannot get it off using 2 wrenches, try applying some heat (with water drained of course).
If someone used thread sealant that hardens, it acts like adhesive making removal difficult.
 
  #10  
Old 01-06-20, 09:21 AM
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Success! was able to remove it. Think the penetrating oil was just enough to get that unstuck!
 
 

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