Tapping for Pressure Relief

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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Mark (PA)
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Posts: 383
Joined: Thu. Feb. 28, 2008 9:40 am
Stove/Furnace Make: 1953 EFM SF-520 High Boy
Stove/Furnace Model: Fitzgibbon Boiler
Location: South Central, PA

Post Sun. Sep. 21, 2008 11:21 am

Ok... So I am wondering something.

on my EFM the 3/4" tapping that is shown in the manual for the pressure relief. Appears to have never been used. So I once again have a plug that is STUCK. like my return plug. It looks like someone tried to get it out at one time as the edge of the corner is already broken off.

Which brings me to my next question.

There is a 1/2" tapping near the front of the boiler, in front of the supply tapping.

Can I use this 1/2" tapping and bush UP to the 3/4" pressure relief valve? Will this matter? I'm guessing that is what the previous owner did. seeing how the plug appears to be pretty much locked in there.

so its use that 1/2" or take my hand at getting ANOTHER plug out. this one is in a much worse spot to get at easily...

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CoalJockey
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Stoker Coal Boiler: (2) EFM 520's, 900, 1300
Hand Fed Coal Stove: (2) Warm Morning Stoves
Location: Loysburg, PA

Post Sun. Sep. 21, 2008 11:28 am

Mark

This isnt really a good answer to your question but may be of some help.

On that 1300 we put in the shop there were a few plugs that were stuck. And I mean STUCK!... Dorked around with them till we rounded them all off. Heated with the oxy-acetylene and everything we could think of. Ended up drilling them out (they are cast; and are soft) and after drilling was able to get a hacksaw blade through the hole. Filed two grooves in each hole, while being careful not to cut into the threads. then we were able to use a chisel to knock them around and make them collapse on themselves and pull them out.

Maybe this could work for you.... and maybe you have even tried this by now. As far as weather you can use that other tapping.... ill let that to the experts!

good luck
Tyler Hall
--Tyler at W.L. Hall Lime & Coal Inc.

House coal yard dealing high quality anthracite and bituminous coals in all sizes, bulk spreading of ag-lime.

Making a living by trucking the two dirtiest products known to mankind for over 100 years!

My carbon footprint is not only huge but its growing all the time.

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franpipeman
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Stoker Coal Boiler: efm 520 stoker fitzgibbons pressure vessel
Hand Fed Coal Stove: harman, russo
Coal Size/Type: rice
Other Heating: alpine propane condensing boiler radiant floor
Location: Wernersville pa

Post Sun. Sep. 21, 2008 5:30 pm

as long as you put it as close the boiler as you can before the first valve and the vessel would be protected from overpressurization

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Freddy
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Stoker Coal Boiler: Axeman Anderson 130 (pea)
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Coal Size/Type: Pea size, Superior, deep mined
Location: Orrington, Maine

Post Sun. Sep. 21, 2008 6:49 pm

You gotta have a 3/4 tapping. Law (and safety) says so. If you ever had a serious problem, the 1/2 inch would not spew enough pressure to keep it from going boom. A 3/4" barely does the job!
Orrington, Maine
Fred

"If you can't say something nice, don't say anything at all".

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billw
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Stove/Furnace Make: EFM 520
Stove/Furnace Model: GOODBYE OIL COMPANY
Location: Dallas, PA

Post Sun. Sep. 21, 2008 7:18 pm

Freddy are the 1/2" PRV's meant for hot water tanks? I've seen them both listed at a couple of online plumbing supply houses.

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Yanche
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Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea
Location: Sykesville, Maryland

Post Sun. Sep. 21, 2008 7:57 pm

The safety valve on a hot water heater senses both temperature and pressure. A boiler safety valve senses pressure only. They are different.
Yanche
Alternate Heating Systems S-130
Stoker Boiler burning Anthracite Pea Coal

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Freddy
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Stoker Coal Boiler: Axeman Anderson 130 (pea)
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Coal Size/Type: Pea size, Superior, deep mined
Location: Orrington, Maine

Post Mon. Sep. 22, 2008 7:09 am

The 1/2" PRV's are for domestic hot water coils of boilers. They do not have a tank, just the coil in the boiler and the pipes that go to a mixing valve then to the domestic water. Because there is no tank involved, the 1/2" has enough capacity to dump if needed.
Orrington, Maine
Fred

"If you can't say something nice, don't say anything at all".

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Blackdiamonddoug
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Stove/Furnace Make: axemen 260 rebuilt by Matt
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Post Mon. Sep. 22, 2008 7:40 am

I am with freddy
Drill out the cast plug.
Then use a easyout to remove the stuck plug.
Run a 3/4 tap in the hole to straighten out the threads.
Most the time just drilling it out will cause it to come out on its on.
BDD

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billw
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Stove/Furnace Make: EFM 520
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Post Mon. Sep. 22, 2008 7:49 am

Thanks for the info Yanche and Freddy. You guys might make a plumber out of me yet.

Mark (PA)
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Posts: 383
Joined: Thu. Feb. 28, 2008 9:40 am
Stove/Furnace Make: 1953 EFM SF-520 High Boy
Stove/Furnace Model: Fitzgibbon Boiler
Location: South Central, PA

Post Mon. Sep. 22, 2008 8:05 am

Thanks guys for your info!

another fun job ahead.

I have no doubt that drilling it out will absolutely not loosen it up if the last one was any indication! HEHE.

out comes the hacksaw, sawzall etc... Oh boy...

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Freddy
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Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined
Location: Orrington, Maine

Post Mon. Sep. 22, 2008 8:12 am

Ohhh, to be fly on your shoulder and get to watch. :)
Orrington, Maine
Fred

"If you can't say something nice, don't say anything at all".

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Yanche
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Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea
Location: Sykesville, Maryland

Post Mon. Sep. 22, 2008 12:22 pm

Using left handed drill bits sometimes makes easy work of drilling out stuck threaded things. I've found the masonry impact drill motors do the best. The impact shock helps get things turning. Harbor Freight sells a small set of left hand drill bits. Buy a second set if you plan on using an impact drill motor. Broken bits are a given. I just grind new points on what's left.
Yanche
Alternate Heating Systems S-130
Stoker Boiler burning Anthracite Pea Coal

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