Hi All,
I recently brewed an all grain batch using the parti-gyle method with one batch to become a lager (pressure lagered) and the other an IPA. The grain bill was as follows:
I mashed out to two boil kettles and equalized the volume to about 6.5 gallons each pre-boil. The pilsner OG ended up being 1.048 while the IPA was 1.078 as measured by hydrometer. I then used a RAPT Pill to monitor fermentation. I oxygenated using pure O2 and an air stone at 1L for about 2 min and added yeast nutrients to both batches. For the IPA I used Lutra Kveik at 95F and for the pressure lager I used SafLager W‑34/70 at around 68F under 1atm.
So, skip ahead about three weeks and the lager dropped to 1.012 FG (74% Att.) while the Lutra IPA is as 1.028 (63% Att) and hasn't budged in about a week and a half. I had stirred up the fermenter several times with no luck. I drew a sample from the fermenter of the Lutra IPA to verify gravity using a hydrometer and sure enough it matches the RAPT Pill (1.028). I tasted a sample and don't notice anything off.
So, I decided to keg the pressure lager and then rack the IPA onto the yeast cake of the lager 3 days ago. I have been tracking the gravity using the RAPT but it hasn't budged and there are no signs of fermentation in the fermenter.
Normally I might conclude that I mashed at too high of a temperature, or used too many unfermentables, but in this case the other half of the parti-gyle fermented down to 1.012 with issue.
Am I missing something here, has anyone else experienced this?
I recently brewed an all grain batch using the parti-gyle method with one batch to become a lager (pressure lagered) and the other an IPA. The grain bill was as follows:
- 18 lbs Pilsner Malt (Avangard)
- 7 lbs Pale Malt (2 Row) UK
- 2 lbs Cara-Pils/Dextrine
I mashed out to two boil kettles and equalized the volume to about 6.5 gallons each pre-boil. The pilsner OG ended up being 1.048 while the IPA was 1.078 as measured by hydrometer. I then used a RAPT Pill to monitor fermentation. I oxygenated using pure O2 and an air stone at 1L for about 2 min and added yeast nutrients to both batches. For the IPA I used Lutra Kveik at 95F and for the pressure lager I used SafLager W‑34/70 at around 68F under 1atm.
So, skip ahead about three weeks and the lager dropped to 1.012 FG (74% Att.) while the Lutra IPA is as 1.028 (63% Att) and hasn't budged in about a week and a half. I had stirred up the fermenter several times with no luck. I drew a sample from the fermenter of the Lutra IPA to verify gravity using a hydrometer and sure enough it matches the RAPT Pill (1.028). I tasted a sample and don't notice anything off.
So, I decided to keg the pressure lager and then rack the IPA onto the yeast cake of the lager 3 days ago. I have been tracking the gravity using the RAPT but it hasn't budged and there are no signs of fermentation in the fermenter.
Normally I might conclude that I mashed at too high of a temperature, or used too many unfermentables, but in this case the other half of the parti-gyle fermented down to 1.012 with issue.
Am I missing something here, has anyone else experienced this?