manometer question

 
Hoytman
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Post by Hoytman » Fri. Dec. 04, 2020 2:59 pm

Ok gang...yeah...I know...search function...did that already a while back and don’t really have time to do it again. I want to get this thing up and running. I tend to forget those searches past a few days and it’s been nearly two months since I last searched and finally bought my manometer.

Stove is ready, two tons of nut Blashak waiting in the wings, and I have my Dwyer Mark II model 25 manometer in the box.

Need to replace two bricks. So when I go get the bricks here is what else I am getting for the manometer:

-12” section of 3/16” brake line
-1/4” O.D. Copper tubing

Is there anything else I need to hook up the manometer?


 
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Post by Lightning » Fri. Dec. 04, 2020 3:25 pm

What's the copper tubing for?

 
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Post by Hoytman » Fri. Dec. 04, 2020 3:33 pm

Lightning wrote:
Fri. Dec. 04, 2020 3:25 pm
What's the copper tubing for?
I was thinking the same thing, but somehow it made it to my list that I found and made in my notebook from the last search I did.

Just found your picture and no copper, just the brake line.

Will Dwyer tubing fit that brake line?
I assume it will.

How far up on the pipe do I drill the hole? My mpd is about 18” from top of stove. I assume anywhere in between?

 
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Post by Hoytman » Fri. Dec. 04, 2020 3:36 pm

Correction...mpd 11 1/2” from top of stove.

 
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Post by Lightning » Fri. Dec. 04, 2020 3:39 pm

Yes, the tubing included with the dwyer will fit snugly over the 3/16 inch brake line. Probe the pipe upstream of any dampers.

 
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Post by Hoytman » Fri. Dec. 04, 2020 3:43 pm

Up stream of the damper then (above the mpd)?

 
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Post by Lightning » Fri. Dec. 04, 2020 3:48 pm

Hoytman wrote:
Fri. Dec. 04, 2020 3:43 pm
Up stream of the damper then (above the mpd)?
No sir.. upstream of any dampers means between the stove and damper. Upstream meaning the stream starts at the stove and flows towards the chimney. In my opinion you want the manometer to reflect the negative pressure that the fire is feeling so there shouldn't be any devices between the fire and the manometer probe to influence the reading.


 
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Post by freetown fred » Fri. Dec. 04, 2020 4:03 pm

Why didn't ya just say between stove & MPD Lee?????????????????????? LOL UPSTREAM of damper huh!!! double LOL

 
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Post by Hoytman » Fri. Dec. 04, 2020 4:25 pm

That’s why I asked because I was thinking between the stove and the mpd.

 
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Post by Hoytman » Fri. Dec. 04, 2020 7:07 pm

Lightning wrote:
Fri. Dec. 04, 2020 3:39 pm
Yes, the tubing included with the dwyer will fit snugly over the 3/16 inch brake line. Probe the pipe upstream of any dampers.
I assume you cut the flared end off where the tubing slides in?
Obviously the end going into the stove also has the flared end cut off.

What holds the tubing square into the stove pipe? Your piece of tin?

Are any of you putting a 90* bend in the brake line?

EDIT:

I just found the answers to these questions in the Manometer Install thread.
Last edited by Hoytman on Fri. Dec. 04, 2020 8:06 pm, edited 1 time in total.

 
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Post by Hoytman » Fri. Dec. 04, 2020 7:16 pm

Lee, I understood you meant between the stove and the mpd, but the way you worded that you had me wanting to ask the question just to be sure and you clarified...between the fire and the mpd. Understood. Unless told otherwise that is how it will be installed.

Now humor me...I have a silly question.

Wouldn’t the manometer work on either side of the mpd?

 
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Post by Lightning » Fri. Dec. 04, 2020 8:22 pm

Hoytman wrote:
Fri. Dec. 04, 2020 7:16 pm
Wouldn’t the manometer work on either side of the mpd?
Sorry about the confusion with using "upstream" ;) it's all good.

Yes the manometer would work but it would be showing you the pressure difference of the chimney instead of the stove. Since the MPD is a restricting device, the pressure on the downstream side would read higher than the stove variably depending on how it's set.

 
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Post by Hoytman » Fri. Dec. 04, 2020 9:00 pm

You mean the pressure on the chimney side would read higher than the stove side?

I’m not sore how it all works, just thinking out loud some.

If the damper is used to slow the draft wouldn’t it slow it on both sides of the damper in the pipe?

As an after thought...
I just realized (had forgotten) that my mpd isn’t typically used anyway unless I burn wood. I put the mpd in just for the purpose of burning wood and if I had too strong of draft or a runaway burn. I don’t worry about that with the coal as the pipe stays so much cooler and is always in the full open position while burning coal (***see below***).

Here’s the difference and what I just realized...my Hitzer 354 has a built in damper in the top of the stove...so even if I didn’t have an mpd in my stove pipe my manometer tubing would still be in the pipe after the damper in the stove...regardless of where I placed it in the stove pipe.

Wow...that’s screwed up right there. Not even sure I needed to ask where to place the manometer tubing now. LOL!





***
As a side note...
While at Hitzer yesterday picking up another ton of nut coal, talking with Dean Lehman and Mark, one of the Amish workers there (who by the way is a super nice and very knowledgeable about these stoves), I noticed they had a stove running...a 30/95 hopper fed stove, burning pea coal, with an mpd...in the almost fully closed position. She was idling right along...purring like a kitten. (Mark said his brother loaded it. LOL! His brother is a pea kind of guy and Mark said the stoves run better on nut in his opinion and many years building the stoves. It’s sort of an inside joke between the two guys. LOL!)

For those of you that went to the forum get-together a few years ago at Hitzer, Mark is the Amish man that invited us to his home.

Also for those at the get-together and those who went to the Back40 Junction to eat...that place has permanently closed due to COVID-19. Sad! They had great food and the nostalgia inside that place was really neat.

 
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Post by WNY » Sat. Dec. 05, 2020 8:43 am

you want to measure draft of the stove, so the closer to the stove, the better. before MPD and baro.

 
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Post by Lightning » Sat. Dec. 05, 2020 9:34 am

If it was my stove, I would tap the fire chamber for a probe if it had a built damper. But I'm a bit fanatical and realize most people don't wanna put a hole in their stove lol.


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