Blower

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rkcarguy
Posts: 363
Joined: Tue Aug 22, 2017 10:33 am

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
Posts: 1246
Joined: Thu Jan 09, 2003 6:50 pm
Location: Michigan, USA

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
Posts: 310
Joined: Mon May 18, 2015 5:26 am
Location: Erie, PA

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
Posts: 47
Joined: Wed Jan 18, 2012 3:47 pm

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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Joined: Tue Dec 06, 2016 4:05 pm
Location: Elmwood, Wisconsin

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
Posts: 310
Joined: Mon May 18, 2015 5:26 am
Location: Erie, PA

Re: Blower

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

Fascinating, thanks guys!

David

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