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12-23-2021, 11:28 PM   #1
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developing tank roll film

heres teh thing, been using an AP compact from freestyle for two years, and its just getting worse in the leakage department. At first it was just the red lid leaking, now its the screw theads leaking.

who is making a tank for film on a reel, that has a reliable sealing lid, that doesnt use more then one hole for drainage

12-24-2021, 12:24 AM   #2
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My AP tank leaks as well but I stop it by using a layer of plastic wrap beneath the red lid. My threads have not started leaking.
12-24-2021, 01:10 AM   #3
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Since the beginning in the 70s the Jobo tanks. They all leak (I tried AP and Paterson) but the Jobo 1500 less.
12-24-2021, 03:57 AM   #4
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Get a stainless steel tank!

12-24-2021, 06:12 AM   #5
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None of my Paterson tanks leak; but you could always go with a stainless tank.
12-24-2021, 08:45 AM   #6
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I don't remember my Paterson or my Jobo tanks leaking badly, but using inversion processing could cause a little bit of "blowby" from around the polythene lid.
On the Paterson I rectified the problem with a pin-hole in the lid.
Seal the hole with a fingertip when inverted, release to vent when back upright.
I only usually used the Jobo tanks in the machine, (can't remember what it was called), so any if there was any leakage, it dissipated in the water bath.
12-24-2021, 12:21 PM   #7
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I've seen some "leak proof" tanks but can't remember where. I think those were a combination of SS and plastic. I even have the issue with my Nikor SS tanks. The main lid fits tight enough but the filler lid does not and the little bit of pressure developed inside the tank during development will push a bit of solution past the seal upon inversion. Probably a tank which relies on O rings might be liquid tight but nowadays you could be hard pressed to find one. Are you into 3D printing? Some designs exist there which might be an improvement in your case.

https://www.thingiverse.com/thing:3726422

https://www.thingiverse.com/thing:4631846


Last edited by Bob 256; 12-24-2021 at 12:33 PM.
12-24-2021, 01:44 PM   #8
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dont 3d print.
01-11-2022, 09:50 AM   #9
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As far as I know the AP tanks leak a tiny bit which is considered normal. That's why they are so cheap.
I am using the Paterson one and no leaking here. Not a single drop.
For my 4x5 films I am using the Stearmanpress tank which also is completely tight.
Always make sure to pre wet o-ring (if there are any) with water or better salvia prior closing so it doesn't roll aside.
01-27-2022, 06:01 PM   #10
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QuoteOriginally posted by Pentaxrookie Quote
As far as I know the AP tanks leak a tiny bit which is considered normal. That's why they are so cheap.
I am using the Paterson one and no leaking here. Not a single drop.

My experience has been the exact opposite.
My Paterson System 4 tanks have all leaked a bit.
My AP Compact developing tanks don't spill a drop.

Chris
01-28-2022, 09:30 PM   #11
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QuoteOriginally posted by ChrisPlatt Quote
My experience has been the exact opposite.
My Paterson System 4 tanks have all leaked a bit.
My AP Compact developing tanks don't spill a drop.

Chris
Ah, interesting. Thanks for sharing.
01-29-2022, 01:03 PM   #12
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Here's one if the type that says it doesn't leak and the price is reasonable.

https://www.adorama.com/dkt235.html?adlclid=8976fa228bcc132f29929...e=adl-umbase-p
01-29-2022, 11:56 PM   #13
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Since this thread opened, I have been searching for a better way to stop my AP Compact from leaking. Before starting inversions, I press down on the top of the red lid with the the heel of my hand as if it were a piece of tupperware. This creates a negative pressure inside the tank which helps prevent the leaking.
01-30-2022, 07:12 AM   #14
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QuoteOriginally posted by jbinpg Quote
Since this thread opened, I have been searching for a better way to stop my AP Compact from leaking. Before starting inversions, I press down on the top of the red lid with the the heel of my hand as if it were a piece of tupperware. This creates a negative pressure inside the tank which helps prevent the leaking.

Yes, "burping" the lid is essential.

Chris
01-30-2022, 11:35 PM   #15
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QuoteOriginally posted by jbinpg Quote
Since this thread opened, I have been searching for a better way to stop my AP Compact from leaking. Before starting inversions, I press down on the top of the red lid with the the heel of my hand as if it were a piece of tupperware. This creates a negative pressure inside the tank which helps prevent the leaking.
I do the same with the Paterson tank and in a similar way with the Stearman Press tank. So it seems this is the solution to all leaking.
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