Fermentation issue :/

[JahazielB]

Hi everybody, in my second batch ever i brew a Foreign Extra Stout. 16 Liters with a OG of 1.075 aiming 1.018 of FG. I used 1 pack of dry yeast S-04.

5 days after pitching i took a gravity sample: 1.030
9 days after pitching i took another gravity sample: 1.030

My question is: I got a stuck fermentation or it's just slow?

Don't know if i pitched insufficient yeast or wrong yeast strain.
If that was the case, can i bottle it after the conditioning even though there is too may fermentable sugars left? accepting the sweetness.
Or what are your thoughts?

 

[VikeMan]

It might be "stuck." Or it might be done. Recipe details please... grain bill, mash temp & mash length (if applicable).

ETA: are you measuring gravity with a hydrometer or a refractometer?

 

[JahazielB]

It might be "stuck." Or it might be done. Recipe details please... grain bill, mash temp & mash length (if applicable).

2row briess pale malt 4kg (67 % bill)
Caramel 90L briess 0.35 kg (6% bill)
Roasted barley Weyermann 1.35kg (22 % bill)
Black malt briess 0.25 kg (4% bill)

Mashed at 68.9º (156 F) for 60 min.

 

[Ultryx]

Are you measuring your gravity with a hydrometer or a refractometer?

 

[VikeMan]

With those specs, BrewCipher predicts an apparent attenuation of 63.9%, and an FG of a hair over 1.027. Your 1.030 isn't too far off. I think it's safe to say this is not getting anywhere near 1.018. Where did the expectation of 1.018 come from?

 

[JahazielB]

Are you measuring your gravity with a hydrometer or a refractometer?

Hydrometer with temp correction

 

[Norlz]

Hi everybody, in my second batch ever i brew a Foreign Extra Stout. 16 Liters with a OG of 1.075 aiming 1.018 of FG. I used 1 pack of dry yeast S-04.

5 days after pitching i took a gravity sample: 1.030
9 days after pitching i took another gravity sample: 1.030

My question is: I got a stuck fermentation or it's just slow?

Don't know if i pitched insufficient yeast or wrong yeast strain.
If that was the case, can i bottle it after the conditioning even though there is too may fermentable sugars left? accepting the sweetness.
Or what are your thoughts?

Hi

I always use two pack of dry yeast when my O.G is above 1,060 to make sure I am not underpitching.

Cheers

 

[Ultryx]

Hydrometer with temp correction

That was my thought, but it seems you're already fine there...

I might be inclined to agree with @Norlz about pitching 2 packets, especially if your OG was 1.075. If that's not the issue then like @VikeMan mentioned it's possible the recipe is slightly differing from your expectation?

 

[JahazielB]

With those specs, BrewCipher predicts an apparent attenuation of 63.9%, and an FG of a hair over 1.027. Your 1.030 isn't too far off. I think it's safe to say this is not getting anywhere near 1.018. Where did the expectation of 1.018 come from?

On a spreadsheet, but yes, i think that could be the problem. Thanks man.

 

[JahazielB]

That was my thought, but it seems you're already fine there...

I might be inclined to agree with @Norlz about pitching 2 packets, especially if you're OG was 1.075. If that's not the issue then like @VikeMan mentioned it's possible the recipe is slightly differing from your expectation?

Yes, i think it was probably a combination of both.

 

[VikeMan]

Yes, i think it was probably a combination of both.

In my experience, under pitching doesn't cause under attenuation, unless the under pitch is severe. But it can certainly cause other issues. I wouldn't expect any major issues with a single pack of S04 in a 4 gallon batch of 1.075.