Blower

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rkcarguy
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Re: Blower

Post by rkcarguy » Thu Nov 30, 2017 2:37 pm

Gentlemen, as a product suggestion, there are blowers available for venting the engine compartments on boats that are 12 volts, quiet, cheap, and available in several sizes and CFM ratings. Most are plastic, so you'd want to make sure it's far enough away that it doesn't get melted.

https://www.google.com/search?q=bilge+b ... 20&bih=934

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Marty_Knox
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Re: Blower

Post by Marty_Knox » Thu Nov 30, 2017 3:03 pm

NP317 wrote:Referring to Marty Knox's discussion of dissolved oxygen in the boiler water, and the damage it can do, I have developed a steam-up process that decreases possible oxygen damage:
During steamup I leave a valve open on top of the steam dome. I let steam blow out for several minutes after the water boils. This is supposed to allow oxygen to escape before pressure build up. I learned this process years ago from operators at the Univ. of Washington steam plant. I'd be interested in Marty's (or anyone's) opinion of this procedure.
~RN
Russ, I would say that is an excellent practice. It is more common in stationary practice than in locomotive practice.
I have done it, sometimes unintentionally.
Why isn't the pressure coming up?
Oops, I left a valve open!

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Builder01
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Re: Blower

Post by Builder01 » Thu Nov 30, 2017 4:23 pm

Is "dissolved oxygen" different from the oxygen that the boiler water is actually made of?

David

BillF
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Re: Blower

Post by BillF » Thu Nov 30, 2017 6:15 pm

Builder01 wrote:Is "dissolved oxygen" different from the oxygen that the boiler water is actually made of?
Yes, it is. The oxygen in the water is one oxygen atom bonded to two hydrogen atoms. The oxygen in the atmosphere that dissolves in water is molecular oxygen: two atoms of oxygen bonded together. A water molecule is not going to break down into oxygen and hydrogen atoms until it gets to a temperature well beyond what any of our metals can stand. But, molecular oxygen, just like atmospheric oxygen readily participates in reactions like those that drive life, and those that cause corrosion. The dissolved oxygen in water is what fish need to "breathe" and low oxygen is what usually causes large fish kills in shallow waters in the summer.

In industrial processes that need water for washing but need to avoid dissolved oxygen, "de-oxygenated water" is often used, and is produced by bubbling pure nitrogen through the water for some length of time.

- BillF

John Hasler
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Re: Blower

Post by John Hasler » Thu Nov 30, 2017 6:53 pm

>A water molecule is not going to break down into oxygen and hydrogen atoms until it gets to a temperature well beyond what any of our metals can stand.

We don't have to worry about it at the temperatures we deal with but much above 300C self-ionization increases enough to make pure water rather corrosive.

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Builder01
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Re: Blower

Post by Builder01 » Thu Nov 30, 2017 7:37 pm

Fascinating, thanks guys!

David

FRED DADDI
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Re: Blower

Post by FRED DADDI » Tue Feb 20, 2018 8:00 am

Bill Shields wrote:I use a granger blower

1TDN2

made an adapter to cover the inlet and stick down in the stack.

40 years old, still running
Just ordered it. Any pointers on the adapter? Stack Straight into the inlet ?


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Fred_V
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Re: Blower

Post by Fred_V » Tue Feb 20, 2018 8:09 am

FRED DADDI wrote:
Tue Feb 20, 2018 8:00 am
Bill Shields wrote:I use a granger blower

1TDN2

made an adapter to cover the inlet and stick down in the stack.

40 years old, still running
Just ordered it. Any pointers on the adapter? Stack Straight into the inlet ?


Sent from my iPhone using Tapatalk
12 CFM? Won't that take a couple of days to raise steam?
Fred V
Fred V
Pensacola, Fl.

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Bill Shields
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Re: Blower

Post by Bill Shields » Tue Feb 20, 2018 9:27 am

more than enough air. I also use one on my COAL FURNACE....

adapters can be anything you like. I have one that drops into the stack (stack is cast and has a bead on the outside). I have another that fits INSIDE of a stack that is a straight piece of pipe.

Here is a picture of the 40 year old critter.

This adapter is brazed to a piece of sheet metal that is then screwed to the inlet
Attachments
blower.jpg

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Bill Shields
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Re: Blower

Post by Bill Shields » Thu Mar 29, 2018 2:56 pm

Fred:

If you need a better picture, I can do that. If you want to SEE IT I will be at PLS boiler test day end of April.

I can do dimensioned drawings if you want...but I need to know stack info....

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Fred_V
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Re: Blower

Post by Fred_V » Fri Mar 30, 2018 7:46 am

I have a small blower like that on my Chloe; takes over an hour to raise steam. I understand that you don't want to heat up too quickly and I control that on larger blowers with a damper or, better yet, raise the motor up to create a gap between the motor and blower housing.
Pick you poison.
Fred V
Pensacola, Fl.

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Bill Shields
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Re: Blower

Post by Bill Shields » Fri Mar 30, 2018 8:02 am

That is odd because that blower will raise steam on my 3/4" Hudson in 15 minutes or so and on my 1-1/2" 2-8-0 Camelback in about 1/2 hour...and on the Tom Thumb in 10 minutes (but that is a very small boiler)...

Perhaps 'similar' is applicable.

as I said...with this blower, I run 1/2 of my coal furnace to heat my house....

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