Spunding Valve Pressure Dropping

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phishie
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Spunding Valve Pressure Dropping

Postby phishie » Fri Aug 19, 2016 11:22 am

4 Secondary and Lagering

... After racking, attach a pressure relief valve (spundapparat, but commonly called a spunding valve) set to 0.8 bar. ...


I'm on my second LODO batch at the secondary step. In both batches I've noticed my spunding valve slowly drops/loses pressure over the first few days of secondary and I have to add in a little CO2 to bring the pressure back up to 0.8 bar. I've tested the connection, used plumbers tape and I'm 99% sure my spunding valve does not have a leak. Is this pressure drop in secondary due to the beer absorbing the CO2 or due to the slow temp drop from 41 to 37? Is anyone else seeing this?
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Brody
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Re: Spunding Valve Pressure Dropping

Postby Brody » Fri Aug 19, 2016 12:27 pm

I've had that happen before, probably a slow leak somewhere
phishie
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Re: Spunding Valve Pressure Dropping

Postby phishie » Fri Aug 19, 2016 12:39 pm

Brody wrote:I've had that happen before, probably a slow leak somewhere


Did you find a leak in the spunding valve or in the keg hardware? This is a separate keg using the same valve as my first batch, hard to believe it's a keg issue.
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Brody
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Re: Spunding Valve Pressure Dropping

Postby Brody » Fri Aug 19, 2016 1:25 pm

I've had leaks in my gas in post, the lid, and now the valve itself (after dropping it) which I'm trying to sort. A keg can leak one batch and not the other depending on the seal, lube, and how everything was cleaned and reassembled.
phishie
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Re: Spunding Valve Pressure Dropping

Postby phishie » Fri Aug 19, 2016 1:34 pm

Brody wrote:I've had leaks in my gas in post, the lid, and now the valve itself (after dropping it) which I'm trying to sort. A keg can leak one batch and not the other depending on the seal, lube, and how everything was cleaned and reassembled.


It's not foolproof but I spray my keg with starsan and look for bubbles, I'm not getting any. I don't use keg lube, guess I should try it.
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Brody
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Re: Spunding Valve Pressure Dropping

Postby Brody » Fri Aug 19, 2016 2:05 pm

phishie wrote:
Brody wrote:I've had leaks in my gas in post, the lid, and now the valve itself (after dropping it) which I'm trying to sort. A keg can leak one batch and not the other depending on the seal, lube, and how everything was cleaned and reassembled.


It's not foolproof but I spray my keg with starsan and look for bubbles, I'm not getting any. I don't use keg lube, guess I should try it.


Could help, it's done the trick for me once or twice. Shit's a pain to get off your hands though.
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Bilsch
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Re: Spunding Valve Pressure Dropping

Postby Bilsch » Fri Aug 19, 2016 2:08 pm

I guess as a last resort one could submerge the whole keg equipped with the spunding valve in water. Depending on the gauge though I might keep that above the liquid level.
Ski
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Re: Spunding Valve Pressure Dropping

Postby Ski » Fri Aug 19, 2016 2:13 pm

I had this happen too. I've done 3 LODO batches now with increasing attention to detail. First batch I force-carbed because I didn't have spunding valves. Tasted fantastic. Drank it fast before any O2 in the CO2 started staling the beer. Second batch I used my new spunding valves, but experienced pressure loss and had to hit it with the gas. Third batch, I tried 2 different things. I fermented to completion, and then quickly added boiled sugar solution to the fermenter. Left it for a few hours until pressure started building up in the fermenter. (I ferment in an SS conical under a little pressure ~ 1psi or so.) Then transferred to kegs under pressure. This time, I used some keg lube on the kegs, and happily I could see the kegs increasing in pressure up to about 20 psi. I should say that I brew ales - never tried a lager yet - so I was carbing the kegs at room temp, 20C/68F. The second batch I had in a fridge at 5C. Poor old ale yeast don't stand a chance that cold. Taking them back up to room temps didn't really help. I think keg lube is a must, when you have low initial pressure, to help seal the cornelius. After that, you need the right temp for your yeast. Even with ales, there is a vast improvement in the malty flavour. Loving it!
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Brody
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Re: Spunding Valve Pressure Dropping

Postby Brody » Fri Aug 19, 2016 2:13 pm

Brody wrote:
phishie wrote:
Brody wrote:I've had leaks in my gas in post, the lid, and now the valve itself (after dropping it) which I'm trying to sort. A keg can leak one batch and not the other depending on the seal, lube, and how everything was cleaned and reassembled.


It's not foolproof but I spray my keg with starsan and look for bubbles, I'm not getting any. I don't use keg lube, guess I should try it.


Could help, it's done the trick for me once or twice. Shit's a pain to get off your hands though.


I should add though at this point I'm not sure I would want to open the lid. I picked up a decent bit of O2 cracking one open for gelatin (although the solution itself must have added some).
phishie
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Re: Spunding Valve Pressure Dropping

Postby phishie » Fri Aug 19, 2016 2:58 pm

Brody wrote:
Brody wrote:
phishie wrote:
It's not foolproof but I spray my keg with starsan and look for bubbles, I'm not getting any. I don't use keg lube, guess I should try it.


Could help, it's done the trick for me once or twice. Shit's a pain to get off your hands though.


I should add though at this point I'm not sure I would want to open the lid. I picked up a decent bit of O2 cracking one open for gelatin (although the solution itself must have added some).


Yup, this is for future reference.

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