Mineral Oil PC - 4/7/2010 Houston, we have liftoff!! *56K Warning*

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Rubycon

Madame President
Aug 10, 2005
17,768
485
126
I roughed up the interior surface of the fitting with a file before I globbed silicone in there. Maybe I didn't get it rough enough.

Even so roughness helps it hold mechanically but oil requires a tight positive seal or it will leak.

Epoxy adheres to PVC pretty well, however.
 

lsv

Golden Member
Dec 18, 2009
1,610
0
71
Posting in epicness. Nice job, I'd never put my pc in oil. Too much trouble
 

adlep

Diamond Member
Mar 25, 2001
5,287
6
81
I enjoy following up this thread and conversation between Rubycon and legoman. It is a very humbling experience. Where is all that knowledge and skill coming from? My faith in humanity is partially restored thanks to you both...
 

legoman666

Diamond Member
Dec 18, 2003
3,629
1
0
Haha a little leak never got in the way of Wyatt Earp!
Lol, I should have taken your advice about the epoxy in place of the silicone. However, I took a quick look at those silicone plugs yesterday and both of them appeared to be intact. Must be leaking from some place else.... I need to remove one of the radiators to take a better look (pain in the ass)

Posting in epicness. Nice job, I'd never put my pc in oil. Too much trouble
Haha, tell me about it. "This is all going to end in tears" is what my father told me. He was pretty much right.

I enjoy following up this thread and conversation between Rubycon and legoman. It is a very humbling experience. Where is all that knowledge and skill coming from? My faith in humanity is partially restored thanks to you both...
Experimenting and experience. My outlook is: if someone else is able to do something, then there's no reason why I can't do it also.
 

ehume

Golden Member
Nov 6, 2009
1,511
73
91
And Rubycon has to keep her cruise ship from leaking, after all.
 

legoman666

Diamond Member
Dec 18, 2003
3,629
1
0
Well, I think Rubycon needs to come to Ohio. I can't find the god damn leak on my case. The silicone "caps" on my sawed off T's are not leaking. The fittings and T's in the front of the case are not leaking. The left side radiator is not leaking. I don't think the bulkhead fittings on the bottom of the tank are leaking but I tightened them anyway (but it's kind of hard to tell without the tank being full and providing pressure). The only potential leak spots that I haven't been able to check yet are the right side radiator (unlikely, it's made from brass, copper and steel and it wasn't leaking before) and maybe the NPT fitting on the drain.

Stumped.
 

Gillbot

Lifer
Jan 11, 2001
28,830
17
81
Dust suspect areas with flour or something similar and you should see the trail if the leak runs through it.
 

Rubycon

Madame President
Aug 10, 2005
17,768
485
126
You can put small amounts of dye in the oil such as ones here:

http://www.amazon.com/Tracer-Product.../dp/B000JFHNTM

It helps finding trace amounts. Nice thing with UV LEDs it's a LOT easier to use a small flashlight source.

And since your oil becomes fluorescent you can add UV lighting to your case and it will glow! (or use a lower power bluray laser to create beams through the oil, etc.)
 

Zebo

Elite Member
Jul 29, 2001
39,398
19
81
Well, I think Rubycon needs to come to Ohio. I can't find the god damn leak on my case. The silicone "caps" on my sawed off T's are not leaking. The fittings and T's in the front of the case are not leaking. The left side radiator is not leaking. I don't think the bulkhead fittings on the bottom of the tank are leaking but I tightened them anyway (but it's kind of hard to tell without the tank being full and providing pressure). The only potential leak spots that I haven't been able to check yet are the right side radiator (unlikely, it's made from brass, copper and steel and it wasn't leaking before) and maybe the NPT fitting on the drain.

Stumped.

Very nice job. I've often thought about doing one for true silence but what a mess!

As far as your leak... maybe oil is creeping up the cables?
 

legoman666

Diamond Member
Dec 18, 2003
3,629
1
0
Dust suspect areas with flour or something similar and you should see the trail if the leak runs through it.

You can put small amounts of dye in the oil such as ones here:

http://www.amazon.com/Tracer-Product.../dp/B000JFHNTM

It helps finding trace amounts. Nice thing with UV LEDs it's a LOT easier to use a small flashlight source.

And since your oil becomes fluorescent you can add UV lighting to your case and it will glow! (or use a lower power bluray laser to create beams through the oil, etc.)

While those are both valid ideas, there is so much oil all over the god damn place that I don't think they'd help

Very nice job. I've often thought about doing one for true silence but what a mess!

As far as your leak... maybe oil is creeping up the cables?

Thanks! As you can see in this video, it is very quiet

http://www.youtube.com/watch?v=iyBrYHmtEyo







 
Last edited:

Gillbot

Lifer
Jan 11, 2001
28,830
17
81
While those are both valid ideas, there is so much oil all over the god damn place that I don't think they'd help

that's why you dust it on. It'll coat the surface in a layer then you'll see it "streak" where the new oil is flowing through.
 

legoman666

Diamond Member
Dec 18, 2003
3,629
1
0
And now for some fun math. I think this is all correct, anyone recently take a heat transfer class? I wanted to figure out the flow rate of the oil

Properties of oil:
Specific gravity: 0.9 g/cm^3
Heat capacity: 1.966 J/(K*g)

Power draw of computer: 270 W = 270 J/s
deltaT of oil In/Out temp: 1.94K

(270 J)/s * (cm^3)/(.9 g) * 1/(1.94 K) * (K*g)/(1.966 J)
Everything cancels but the cm^3/s and yields: 78.66 cm^3/s
I plugged that number in Wolfram alpha to convert to gallons/hour and got 74.81gal/h

I want a few more data points before I accept that as definite. Also, not 100% of the heat is dissipated in the radiators, so it's not entirely accurate but I feel it's a decent approximation. The data sheet for my pump, the Eheim 1250, says about 250gal/h for 2ft head, but that doesn't take into account any pressure drop due to rads, tubing, etc.
 

Rubycon

Madame President
Aug 10, 2005
17,768
485
126
Don't forget you will have other loss/gain through other means since your vessel is not particularly insulated. (that's nit picking, btw.)

Now the pump...

They are designed to pump water from fresh water (sg = 1.0 g/ml) to seawater (1.0245 g/ml typ). Oil has a lower sg but is much more viscous. This will have an impact on your flow rates. You can measure with a spill bucket and chronograph (easy) or install a flow meter designed for the fluid in use. (more difficult and definitely more expensive!)

If the impeller is not rattling it should be OK. Of course the viscous damper effect would probably make low grade rattle inaudible. The only way to check is physically verify flow rates.
 

legoman666

Diamond Member
Dec 18, 2003
3,629
1
0
You can put small amounts of dye in the oil such as ones here:

http://www.amazon.com/Tracer-Product.../dp/B000JFHNTM

It helps finding trace amounts. Nice thing with UV LEDs it's a LOT easier to use a small flashlight source.

And since your oil becomes fluorescent you can add UV lighting to your case and it will glow! (or use a lower power bluray laser to create beams through the oil, etc.)

I have some dye and a UV light. Is the dye going to make my oil conductive?
 

Rubycon

Madame President
Aug 10, 2005
17,768
485
126
I have some dye and a UV light. Is the dye going to make my oil conductive?

It should not matter especially at the dielectric strength you need. Also a little dye goes a long ways! For example I can dip a tooth pick into the bottle of dye just so its tip is wetted and then stir that end in a jug of water and the entire contents become active.

It's an old halloween prank - take this treated water and pour into a (well rinsed!) Prestone bottle. Drink right from this bottle in the presence of blacklight blue lamps and the audience gets the impression that you're drinking straight anti freeze! (that's really bad for you. )
 

legoman666

Diamond Member
Dec 18, 2003
3,629
1
0
It should not matter especially at the dielectric strength you need. Also a little dye goes a long ways! For example I can dip a tooth pick into the bottle of dye just so its tip is wetted and then stir that end in a jug of water and the entire contents become active.

It's an old halloween prank - take this treated water and pour into a (well rinsed!) Prestone bottle. Drink right from this bottle in the presence of blacklight blue lamps and the audience gets the impression that you're drinking straight anti freeze! (that's really bad for you. )

Cheers. I found a leak! (Not sure if it's the only one or not, so I didn't say 'the' leak). Up at the very top of a corner, the joint between the two sheets of acrylic is not 100% tight. It looks like the top 1.5" isn't quite sealed. I drained the tank to about 2/3 and I'm waiting for the oil to drip away so I can glob some silicone in that corner.


Hard to take a picture of it, I think I kind of got it in this shot, you can see the small gap.

I never ran into this leak before because the last time I was messing with this case (5 months ago) I didn't fill it as high. Also explains why it didn't leak when I was leak testing (didn't fill it this high) and it also explains why I couldn't find it when poking around in the bottom compartment.
 

Rubycon

Madame President
Aug 10, 2005
17,768
485
126
Just be careful that you remove ALL traces of oil BEFORE applying RTV. If ANY oil is present it simply will not stick.
 

legoman666

Diamond Member
Dec 18, 2003
3,629
1
0
Good news folk, I patched the leak in the top corner yesterday. I cleaned up the plexiglass with some paint thinner, let it dry, then applied silicone. I'm at uni now, but the plan is to refill the tank when I get home today

Also, I made little clips out of aluminum to hold my silicone caps for the temperature sensors in place; they're not going anywhere.
 

smackababy

Lifer
Oct 30, 2008
27,024
79
86
I wish the pictures would show up while I'm at work. I have a friend who wants to build a rig like this and I'd like to scare him off of it before he tries and drags me into it with him.
 

legoman666

Diamond Member
Dec 18, 2003
3,629
1
0
I was thinking about buying that Indigo Extreme product and using it on my CPU to try and lower the temps. Does anyone have any experience with it?
 
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