efm pressure is too high

Re: efm pressure is too high

PostBy: Yanche On: Mon Feb 18, 2008 9:14 pm

Bob wrote:When I visited AHS I saw boilers during assembly and welding. I don't believe that the coal gun incorporates stays--basically the pressure vessel is a series of concentric circles and don't need the reinforcement that stays provide in designs that have relatively large flat plate sections.

Most of the boilers AHS makes do incorporate relatively large flat plate sections and use stays. If you go to the AHS home page http://www.alternateheatingsystems.com/boilers.htm you can see the ends of the stays on the Multi fuel boiler.
I agree the size and shape of the coal gun boilers make it unlikely "stays" are needed.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: efm pressure is too high

PostBy: stoker-man On: Wed Feb 20, 2008 6:36 am

I was talking to a dealer yesterday from Summit Hill and he thinks that Nate, the L&I inspector, PO'd enough people up there, that he might have been transferred to another area.

Coming soon....... to a theater near you ?
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove

Re: efm pressure is too high

PostBy: stoker-man On: Tue Feb 26, 2008 9:34 pm

I got the scoop today about what happened at the church explosion.

Forgive me for technical errors but it went like this:

The high limit on the aquastat stopped functioning at a point sometime in the past and the company that serviced the boiler a few days earlier didn't check for it during the servicing procedure and didn't catch it. Also the pressure relief valve was stuck closed and wasn't caught either.

A water leak and loss of water in a zone piping caused the boiler to continue to run because the tstat wasn't satisfied and since the high limit switch stopped working, the boiler continued to run up to about 260 degrees. As the pressure increased, the relief valve didn't release pressure until it finally gave way at 45#. At that point the superheated water blew out and "flashed" into steam, which the inspectors determined to be about 750,000# per psi, which blew a nearby 4 inch block wall 2" off plumb. The block wall was put in by "somebody" when they removed a supporting pillar for the 2nd floor of the church. Being 2" off plumb, the wall collapsed and the entire church collapsed internally, up to and including the roof. The gauge was found in the debris and the pressure needle was frozen at 45#.

So, the moral of the story is: Check your high limit switch and pressure relief valve when you service your boiler.
stoker-man
 
Hand Fed Coal Boiler: 1981 efm wcb-24 in use 365 days a year
Coal Size/Type: Anthracite/Chestnut
Other Heating: Hearthstone wood stove