Hot water circuit in Harman hand fired

Hot water circuit in Harman hand fired

PostBy: Cap On: Sat Feb 15, 2014 7:10 pm

I been heating domestic hot water for bout 8 years with a section of straight ¾" tubing x .065" wall. I made this in 2006-2007 with a tube bender and Parker A-Lok SS fittings. I discovered yesterday it has failed. It has a stress crack. I will remove it. Little crusty too but it served me well. If anything, my hot water was too hot. It was too long.

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316ss ¾" tubing
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I have this hot water coil I can install. It is the Harman factory part. But I do not have any additional mounting parts for it.
It is ¾" npt without a taper.

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Harman factory tube, ¾" ss pipe
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I found these locking nuts on Amazon. 304SS x ¾" npt. I am wondering if I should go with a total of 8 or if 4 will be enough?

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¾" ss 304 lock nuts
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Does anyone have one of these Harman coils installed? What parts came with the kit? I am thinking SS washers or heat resistant washers? I want to be sure I install it soundly as possible so it stays put in the stove.

Lucky for me my existing ¾" penetrations are perfectly in line with what the Harman part will use. I just need to up the hole from ¾" to 1.05". This could probe to be more difficult than it sounds as a hole saw may not stay squared and a 1" drill bit will be costly.
Cap
 
Hand Fed Coal Boiler: Harman SF 250, domestic hot water loop, heat accumulator

Re: Hot water circuit in Harman hand fired

PostBy: Dennis On: Sat Feb 15, 2014 8:02 pm

do you have any freinds that would let you borrow a bit,it's a shame to buy one for 2 holes.What about a rattail file/chainsaw file or a reamer,their not so costly.Could you just bend another shorter 3/4" pipe and sell the Harman coil.
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Hot water circuit in Harman hand fired

PostBy: Cap On: Sat Feb 15, 2014 8:22 pm

Dennis wrote:do you have any freinds that would let you borrow a bit,it's a shame to buy one for 2 holes.What about a rattail file/chainsaw file or a reamer,their not so costly.Could you just bend another shorter 3/4" pipe and sell the Harman coil.


Do you have a 1" bit I can wear out?

A step down bit might be my best bet. About $30-$40
Cap
 
Hand Fed Coal Boiler: Harman SF 250, domestic hot water loop, heat accumulator


Re: Hot water circuit in Harman hand fired

PostBy: Dennis On: Sat Feb 15, 2014 8:30 pm

I don't have one,but have know several that I can borrow for you,if needed.It's rare you wear one out,maybe make it dull, then just sharpen it
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Hot water circuit in Harman hand fired

PostBy: Dennis On: Sat Feb 15, 2014 8:38 pm

Cap wrote: I just need to up the hole from ¾" to 1.05". This could probe to be more difficult than it sounds as a hole saw may not stay squared and a 1" drill bit will be costly.

Can you wedge a wooden dowel in the 3/4" hole and then use the hole saw?
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Hot water circuit in Harman hand fired

PostBy: Flyer5 On: Sat Feb 15, 2014 10:46 pm

Cap I believe we have an extra set of parts for that coil. Nuts washers and gaskets. Give me a shout on Monday. Dave
Flyer5
 
Stoker Coal Boiler: Leisure Line WL110
Hot Air Coal Stoker Stove: Leisure Line Pioneer

Re: Hot water circuit in Harman hand fired

PostBy: dcrane On: Sat Feb 15, 2014 11:54 pm

Dennis wrote:I don't have one,but have know several that I can borrow for you,if needed.It's rare you wear one out,maybe make it dull, then just sharpen it


your not going to harm the bit (they should be sharpened all the time anyways)... maybe your wrist when she makes the final brake through and the drill takes your arm for a spin toothy
If you cant find one to borrow locally i'll mail one to you (But a one inch bit should pretty easy to borrow from just about anyone in your neighborhood or town).
dcrane
 
Hand Fed Coal Stove: Crane 404

Re: Hot water circuit in Harman hand fired

PostBy: CapeCoaler On: Sat Feb 15, 2014 11:59 pm

They have hole saws that can accept a larger pilot bit...
I like the bung idea but make it a hardwood...
CapeCoaler
 
Stoker Coal Boiler: want AA130
Hand Fed Coal Stove: DS Machine BS#4, Harman MKII, Hitzer 503,...
Coal Size/Type: Pea/Nut/Stove

Re: Hot water circuit in Harman hand fired

PostBy: Cap On: Sun Feb 16, 2014 5:18 pm

dcrane wrote:
Dennis wrote:I don't have one,but have know several that I can borrow for you,if needed.It's rare you wear one out,maybe make it dull, then just sharpen it


your not going to harm the bit (they should be sharpened all the time anyways)... maybe your wrist when she makes the final brake through and the drill takes your arm for a spin toothy
If you cant find one to borrow locally i'll mail one to you (But a one inch bit should pretty easy to borrow from just about anyone in your neighborhood or town).


Cool, I'll take you up on your offer. I have no neighbors with tools. In addition, I never learned how to sharpen a drill bit. I tried a few times but the bit never seems to cut better. I tried a wheel and/or a file. And I use oil and drill slow.

Let me know what you can do.
Thanks a bunch.
Cap
 
Hand Fed Coal Boiler: Harman SF 250, domestic hot water loop, heat accumulator

Re: Hot water circuit in Harman hand fired

PostBy: Cap On: Sun Feb 16, 2014 5:20 pm

Flyer5 wrote:Cap I believe we have an extra set of parts for that coil. Nuts washers and gaskets. Give me a shout on Monday. Dave


Thanks Dave, I will call you Monday afternoon. Is your number on the website? I'll check.
Thanks a bunch.
Cap
 
Hand Fed Coal Boiler: Harman SF 250, domestic hot water loop, heat accumulator

Re: Hot water circuit in Harman hand fired

PostBy: Flyer5 On: Sun Feb 16, 2014 10:12 pm

Cap wrote:
Flyer5 wrote:Cap I believe we have an extra set of parts for that coil. Nuts washers and gaskets. Give me a shout on Monday. Dave


Thanks Dave, I will call you Monday afternoon. Is your number on the website? I'll check.
Thanks a bunch.



570-752-1811 Just in case.
Flyer5
 
Stoker Coal Boiler: Leisure Line WL110
Hot Air Coal Stoker Stove: Leisure Line Pioneer

Re: Hot water circuit in Harman hand fired

PostBy: Dennis On: Tue Feb 18, 2014 7:58 pm

Cap,I didn't get a 1" drill bit,but I did get a 3/4" to 1" reamer.You will need a 3/4" drill and eat your wheatie and get ready to wrestle the drill.PM me when you get a chance
Dennis
 
Hand Fed Coal Boiler: AHS/WOC55-multi-fuel/wood,oil,coal
Coal Size/Type: Anthracite/stove size

Re: Hot water circuit in Harman hand fired

PostBy: Cap On: Tue Feb 18, 2014 10:27 pm

Dennis wrote:Cap,I didn't get a 1" drill bit,but I did get a 3/4" to 1" reamer.You will need a 3/4" drill and eat your wheatie and get ready to wrestle the drill.PM me when you get a chance


Dennis, I appreciate the offer but I do not have a ¾" electric drill. I have a ½" electric drill. I may just have to buy a step bit. They work really nice when sharp or new.

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Cap
 
Hand Fed Coal Boiler: Harman SF 250, domestic hot water loop, heat accumulator

Re: Hot water circuit in Harman hand fired

PostBy: carlherrnstein On: Fri Feb 21, 2014 7:30 pm

I would use a step drill if the metal is thinner than 3/16" if its much thicker than the steps then the hole has to be drilled from bothe sides or else you will be cutting on more than one step and that risks braking the bit, however they are a lot more forgiving when they break through.
carlherrnstein
 
Hot Air Coal Stoker Stove: combustioneer model 77B
Coal Size/Type: pea stoker/Ohio bituminous

Re: Hot water circuit in Harman hand fired

PostBy: davidmcbeth3 On: Fri Feb 21, 2014 9:47 pm

just start with a small bit and work up ... insure you spray some wd40 on them and let the piece cool down in between drillings
davidmcbeth3
 
Coal Size/Type: nut/pea/anthra
Stove/Furnace Make: Hitzer
Stove/Furnace Model: 503