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Repair or Replace Gas Boiler

bigjohnnymack
bigjohnnymack Member Posts: 1
in THE MAIN WALL

Hi , my 30 year old teledayn lars

FHW natural gas

boiler blew up the t & p valve , copper tubing it was soldered on right off the boiler .

Prior to that , the second floor baseboard lost its heat.

First floor baseboard was still giving off heat. Boiler operating and heating.

Running like that for 4 weeks.

When one evening a loud explosion occurred in the basement.

Upon checking, I found the boiler not running and a little water around the boiler.

Looking further, I saw that the T & P valve had blown right off the boiler top.

Is the boiler repairable ?

By repiping a new T & P valve to the boiler and flushing and purging the air out of the first and second floors baseboards.

Then restart the boiler and do a boiler check.

( What causes the second floor baseboard to lose its heat ? )

Air in the system ?

Water filled evaporator tank ?

Clogged water feed valve ?

Thanks

John M.

Comments

  • pecmsg
    pecmsg Member Posts: 5,771
    https://forum.heatinghelp.com/discussion/200854/repair-or-replace-gas-boiler

    Are you\ saying the threads where the TP relief screws into the boiler stripped and the entire valve shot out?

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 17,325

    Sounds like either you don't have a low water cutoff or the LWCO did not work.

    The boiler should be inspected for damage. If it looks like it may be ok it needs to be disconnected from the system and a hydro test done to check the heat exchanger.

    Thats for starters

  • Jamie Hall
    Jamie Hall Member Posts: 25,702

    It may or may not be salvageable — I wouldn't say repairable. I wouldn't bother; too much more or less difficult to detect damage may have been done by the overpressure event.

    In fact, I would scrap it, the expansion tank, and any trim, such as the defective pressure relief valve, the low water cutoff (if there even was one), aquastat controls — the lot. Again, not worth the time and effort to find out which redundant safeties failed.

    Then start all over again.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Mad Dog_2
    Mad Dog_2 Member Posts: 7,780

    You got a long run out of that Tlyne-Laars...That's not even a company any longer, but Laars make a really nice replacement. Mad Dog

    Consulting by Mad Dog & Matt Jr.
    Long Beach Edhot_rod
  • mattmia2
    mattmia2 Member Posts: 11,939

    Could be the expansion tank was waterlogged and the relief valve was scaled shut. Could be system was low on water because the pressure reducing valve failed and it had a leak of some sort and the boiler got low enough on water that the boiler heated the joint on the relief valve to the point where it melted the solder because part of it was dry firing. In either case it would be best to replace the boiler after either event.

    Did water pour out of the relief valve piping?

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