/diy/ - Do It Yourself

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Homemade vacuum Anonymous Sat Dec 23 09:58:05 2017 No.1301294 [Reply] [Original]

How does one finds small leaks in joints for vacuum?

>>	Anonymous Sat Dec 23 10:17:38 2017 No.1301299 >>1301294 Wet each joint. Look for fizzles.

>>	Anonymous Sat Dec 23 10:33:40 2017 No.1301303 >>1301299 yes, put a little bit of soap in the water and you'll see bubbles.

>>	Anonymous Sat Dec 23 10:34:58 2017 No.1301304 >>1301294 Hold a lit cigarette or other smokey thing near it

Anonymous Sat Dec 23 10:59:42 2017 No.1301315

>>1301299
>>1301303
It's under vacuum, not pressure you dipshits. Its not going to bubble or fizz.

>>1301294
Assuming you have a pressure gauge inline you can use denatured alcohol in a spray bottle. Spray the part under test and see if your vac pressure increases. There will be your leak. A piece if A4 rolled into a long thin trumpet and used as a stethoscope shape could also help you detect the sound of a leak.

>>	Anonymous Sat Dec 23 11:09:24 2017 No.1301319 File: 532 KB, 768x1024, 3562946987_e9c1dfc78b_b.jpg [View same] [iqdb] [saucenao] [google] >>1301299 >>1301303 The absolute state of /diy/ right now.

>>	Anonymous Sat Dec 23 11:22:52 2017 No.1301324 >>1301319 Exactly this. Can be hard to determine the exact source, but it helps narrow it down a lot.

>>	Anonymous Sat Dec 23 11:42:23 2017 No.1301336 >>1301294 pressurize with nitrogen, spray with soapy water

>>	Anonymous Sat Dec 23 11:49:46 2017 No.1301341 >>1301336 ..wow.. Why the fuck are you even in this board?

>>	Anonymous Sat Dec 23 12:00:59 2017 No.1301345 >>1301294 Drip acetone on questionable joints and watch the pressure gauge.

Anonymous Sat Dec 23 12:02:59 2017 No.1301347

Usually the leaks are small and high pitched. I wave my hand in front of the joints, like several inches away. When the squeak gets muffled, I know my hand is over a leaky connection.

If the leak is big enough to affect a gauge, use electrical tape to wrap one joint at a time. If electrical tape fixes the problem, you found the leaky joint.

Anonymous Sat Dec 23 12:29:47 2017 No.1301351

>>1301341
That isn't cause for "wow". Many DIYers have industrial gases handy. Not everyone is stuck with rocks and tree branches for equipment and not everyone who has industrial inert gas cylinders thinks to use gas for leak checks.

>>1301336
Or compressed air. I have nitrogen I use to pressure test vehicle AC systems but ordinary compressed air is enough for OPs setup and he could use a bicycle pump if he hasn't got shop air.

Pressure tests are far superior to vacuum tests because the pressure differential on a vacuum is only atmospheric at most and because outward-flowing leaks are easier to locate.

Apply pressure within reasonable limits for your system, say 30 psi for what I see in OPs pic, then check for leaks with soapy water. 30 might blow off the plastic hose since it's not clamped so I'd secure it first.

>>	Anonymous Sat Dec 23 13:39:31 2017 No.1301391 I'll try the acetone/isopropyl alcohol & expanding gas/pressure increase method, if that fails I'll protect the gauge and add pressure the system. Thanks for

>>	Anonymous Sat Dec 23 13:40:52 2017 No.1301392 ...everything! :p

>>	Anonymous Sat Dec 23 15:30:11 2017 No.1301430 >>1301315 It will still bubble and or show leak. Don't believe me? Try it.

Anonymous Sat Dec 23 15:44:14 2017 No.1301439
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>>1301315
>It's under vacuum, not pressure you dipshits. Its not going to bubble or fizz.

get a load of this idiot. doesnt know that air moves wether its compressed or vacuum

>>	Anonymous Sat Dec 23 15:50:17 2017 No.1301443 >>1301439 >>1301430 You don't know what the fuck you are talking about. you don't put random shit and water into a vacuum air system. >>1301345 >>1301315 This.

>>	Anonymous Sat Dec 23 16:14:21 2017 No.1301460 >>1301443 You don't know what the fuck you are talking about. you don't put random shit and water into a vacuum air system.

>>	Anonymous Sat Dec 23 17:11:55 2017 No.1301481 >>1301294 What happens if you flip that switch to "NO"? Is it dangerous?

>>	Anonymous Sat Dec 23 17:20:25 2017 No.1301483 >>1301304 Winner, winner.

>>	Anonymous Sun Dec 24 06:59:18 2017 No.1301732 >>1301443 You dont need to submerge it buddy.

>>	Anonymous Sun Dec 24 07:10:33 2017 No.1301734 >>1301439 >>1301430 And how is it going to make bubbles on the surface of the joins when air is being drawn in, not being blown out, you fucking wastes of protein?

>>	Anonymous Sun Dec 24 08:04:16 2017 No.1301738 >>1301734 thats what the usb borescope is for fgt

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