Complete Leak Check, CO2 pressurized system - Page 4 - The Planted Tank Forum
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post #46 of 212 (permalink) Old 03-02-2013, 01:53 AM
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Complete Leak Check, CO2 pressurized system

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Originally Posted by kevmo911 View Post
Just curious - have you tried testing with soapy water yet?
Since there was no leak on the first stage...can't I just test connections running by opening the co2 tank and have the LP gauge at a working pressure of 40psi? That way I can do a soapy water test?
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post #47 of 212 (permalink) Old 03-02-2013, 02:16 AM Thread Starter
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So just remove the LP and relief valve and redo the Teflon? Is it possible that the leak is also from the post body?



I have a 1/4"-1/8" bushing....1/8" nipple...to the solenoid which is closed.

My LP gauge read close to 80psi (look at the previous post) and dropped to (40 psi). What is an acceptable drop? From 80psi-?
didn't see you have a postbody, I though it was the regulator only.
I think the slow leak is from the postbody.

please take them apart and re-seal, and a separate test on the regulator only(seal the regulator outlet with 1/4" npt plug, and test the LP side), so you can be sure the regulator is ok.

If you only have the teflon tape to seal, make sure the tape wrap around the threads properly, and press in before you connect the fittings.

there is a small secret for teflon tape method, wet the threads with only a little bit of mineral oil, the tape is better against tear when assemble, and mineral oil will provide better seal, (surface tension to stop co2 push through at micro pore size gaps)
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post #48 of 212 (permalink) Old 03-02-2013, 02:19 AM
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I like that and ill try it. Ill plug the outlet to remove other variables...I will apply a drop of mineral oil prior to adding the yellow Teflo...just curious isn't the mineral going to make it slippery?
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post #49 of 212 (permalink) Old 03-02-2013, 02:29 AM
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just curious isn't the mineral going to make it slippery?
That's the point

What would Honey Badger do?
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post #50 of 212 (permalink) Old 03-02-2013, 02:32 AM
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Do you find it necessary for me to redo the Teflon on the LP and relief valve Or should I just plug the outlet and retest?
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post #51 of 212 (permalink) Old 03-02-2013, 03:53 AM
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I would see if I could find any bubbles in any of the joints and then proceed. I usually just plug the reg and test it alone first though.

What would Honey Badger do?
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post #52 of 212 (permalink) Old 03-02-2013, 04:16 AM
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Don't have any 1/4" MNPT plug ..trip to HD
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post #53 of 212 (permalink) Old 03-02-2013, 04:17 AM Thread Starter
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Do you find it necessary for me to redo the Teflon on the LP and relief valve Or should I just plug the outlet and retest?
test first.


Quote:
Originally Posted by Mathman View Post
I like that and ill try it. Ill plug the outlet to remove other variables...I will apply a drop of mineral oil prior to adding the yellow Teflo...just curious isn't the mineral going to make it slippery?
wrap the tape on male threads and press in, then wet with mineral oil, ONLY A LITTLE BIT, enough to cover the metal with thin layer of oil, use Q-tip.
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post #54 of 212 (permalink) Old 03-02-2013, 05:52 AM
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Complete Leak Check, CO2 pressurized system

Regulator outlet is now plugged. What is the target pressure on the LPG to test for leakage?
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post #55 of 212 (permalink) Old 03-02-2013, 10:50 AM
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Quote:
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Regulator outlet is now plugged. What is the target pressure on the LPG to test for leakage?
No real target; just set it to some arbitrary value (say 30-40 PSI), make a note of it, and then wait. Make sure gas is not flowing from the first stage to the second stage regulation.

If it drops more than 10% or so, then check your plug first to ensure it is not leaking. If you are absolutely sure that it is not leaking, and the pressure is still dropping, then your regulator has a problem.

Anthony

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post #56 of 212 (permalink) Old 03-02-2013, 08:49 PM
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Complete Leak Check, CO2 pressurized system

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Originally Posted by Darkblade48 View Post
No real target; just set it to some arbitrary value (say 30-40 PSI), make a note of it, and then wait. Make sure gas is not flowing from the first stage to the second stage regulation.

If it drops more than 10% or so, then check your plug first to ensure it is not leaking. If you are absolutely sure that it is not leaking, and the pressure is still dropping, then your regulator has a problem.
Thanks for explaining this Anthony...it makes a lot more sense now.
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post #57 of 212 (permalink) Old 03-03-2013, 05:08 PM
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Complete Leak Check, CO2 pressurized system

Thanks for the last PPM bettatail...

Here's what I just finished doing...I removed the relief valve and plugged the port using a 1/4" NPT plug...the same was done for the outlet port.



I connected the regulator to the co2 tank, opened the co2 release handle and now the HP gauge reads "800 psi" (I decided not to wait 6 hours to see if there was a pressure decrease on the HP gauge as I had already done this before and there was no change whatsoever.) So, I closed the co2 tank release handle and opened the regulator valve to charged the LPG to 100 psi, then closed the regulator valve (counter-clockwise) completely. Finally, I removed the regulator from the co2 tank. I waited 10 minutes and took a picture as shown below to record the reading on my LPG (95 psi).




It has been ~11 minutes and the new reading is 90 psi.



Finally, after a total of 6.5 hours the new reading is ~42psi.



At this point, I'm almost certain that there's an issue at the second stage of the regulator.

I will do a soapy water test on both plugs and the LPG...I even have an extra LPG that I can use to narrow the locations of a leak.

Let me know your thoughts.

BTW: I am only doing about 2-2.5 turns of yellow Teflon on the male threads...should I be doing more?
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post #58 of 212 (permalink) Old 03-03-2013, 05:29 PM
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I'd retape the LPG and plugs with slightly more tape (though 2-2.5 wraps with yellow should generally be fine), make sure everything is nice and tight, and try one more time. Since the alternative is a huge hassle, I'd desperately hope it was a simple leak from a port.
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post #59 of 212 (permalink) Old 03-03-2013, 05:36 PM
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Complete Leak Check, CO2 pressurized system

Thanks....I just tried the soapy water test and its very difficult to notice any leaks ( the leak is not fast enough to cause any visible bubbles). I will remove the LPG and both plugs...redo the Connections with more Teflon. I hope that does it.
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post #60 of 212 (permalink) Old 03-03-2013, 05:52 PM
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Make sure all of your connections are tight. No one really mentions it, but you need to get those things tight. At least tight enough that worrying about messing up the fittings. I'm not really sure how else to explain this. Basicly, as tight as you can get the connections without messing anything up...

What would Honey Badger do?
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