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Old October 8, 2008, 04:11 PM
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I priced out a 3/4" NPT thread tap.....150$ sheesh....

I can have it done for me , for less.....Although I'm going to talk to my plumber buddies , see if any of em have one , otherwise it's off to the machine shop for the backplate...I'd really prefer to do it myself tho , the thread needs to be 'narrow side' of the npt.....

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I've yakked at GE polymershapes about an Iso safe 'closed cell' gap filler....we'll see what happens.

I am preparing to do a quick wash of the gap between the tanks.I'll explain why ,but I need to find my camera...Related to this , I've figgered out how to prevent this issue from happening during the back seam/gap fills.


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Old October 8, 2008, 05:25 PM
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150 smackaroos for a 3/4" tap? Jeez...

What do you need the gap filler for? I remember using a closed cell foam called Metzoprotek in some of BA's Aircraft. That foam was basically "anything" resistant, including fireproof.
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Old October 9, 2008, 07:02 PM
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I need gap filler for the gaps I showed earlier........better than filling the whole works with silicone.

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Ok.....

Update time.This time some bad news...gotta show it all.Nothing too serious , but still something I forgot and got punished for.heheh

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>begin lesson

Your basic 'Silicone sealant' (from the stuff you get at rona , to the RTV157 I used ) , cures by absorbing H2O from the air , and emitting pure acetic acid .

It's a known fact Acetic acid will attack materials like copper .....and aluminum for that matter.....Despite this , I forgot , and not only that I did something I should'nt have . I wanted to check the 2nd gas line....so I blew into it......ooops......The acetic acid has both condensed and corroded inside the tube.

This is the result :



haha

Nice water/Cu sulphate mark between the tanks......

>/end lesson



sheesh.....so I hafta clean all that crap outta there....It's just a damned good thing thing the back seams are not on.......

I can prevent this , and I will for the next seams....

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  #344 (permalink)  
Old October 9, 2008, 07:10 PM
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Ouch! Well you learn, you fix, you move ahead. Good luck.
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  #345 (permalink)  
Old October 9, 2008, 07:12 PM
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Which Alu. did you use? I'm asking since we heavily use RTV in the Aerospace business, and it does not attack the alu. we use; typical grade are 2024, 6061, 7075 (with various heat treatments), but all are protected by an alclad surface prep (Alclad - Wikipedia, the free encyclopedia). Thinking about it, you should have primed the Alu. surface before the assembly...
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  #346 (permalink)  
Old October 9, 2008, 07:30 PM
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The Aluminum seems unnaffected by silicone.It's never ever corroded even once....The copper bits however, are a diff story..

The aluminum I used waaaay back when I built tank 1 was (12$ at the scrapyard)Al.....heheh

Once I wash that crap outta that pipe and windows , and dry em off , I'll pump fresh air through em , and allow a vent gap for acetic acid , when I do the seams at the back.

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Old October 9, 2008, 07:34 PM
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Pfuuuu, Can I nominate you has the officla HWC mad Builder/Scientist ? We should create a tag name just for you !
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Old October 10, 2008, 08:30 AM
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That's not bad news, thats good news! It would be bad news if you couldn't clean it!

Like my poppa used to always say, we don't learn by getting things right!

.
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  #349 (permalink)  
Old October 11, 2008, 05:24 PM
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I'd agree with that.

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Did some work today...

I finished 99% of the fabrication for the solvent recovery tank. The saddle unions are done except for cleanup with mr. grinder....



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Here's what the Wildrose vert will look like when all the stuff is done : (this is just a planning tape up)



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Here's what this piece does specifically ;

The 4 " sheetmetal line will connect to a 300 cfm inline fan (suction side)....the output gets vented outside. Air + gas (n2 &CO2) gets sucked in from a)the thinktank vents , and b) the coolant resevoir (the big keg).The inside of the tank gets filled with dry ice.

It vents the co2 and n2 outside and recovers any IPA vapour in it.

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  #350 (permalink)  
Old October 11, 2008, 05:53 PM
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horray crap.. this is huge! any projected finish date? how far along are you?
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