This has only happened once before and I'm scratching my head to see what I did (differently) to perhaps cause it. On a 7bbl batch,
All this is SOP and I've done it with this yeast about 25 batches since we opened last summer. On every occasion except one other time, the next morning shows significant bubbling. This time nothing. Nothing 24 hours later. Nothing 36 hours later. Checked and rechecked all valves were closed. Gravity had dropped 1p, but I had to almost question if my OG was really accurate. At 36 hours, gave it a blast of O2 to rouse. Waited until that night and with still no activity, or change in SG, gave it another longer blast of O2 and pitched another 5 lbs of yeast. Finally, the next morning, 2.5 days after pitch, it was rockin'.
Can't tell yet how it is going to turn out. I have pitched almost every batch (42) at 64 degrees, letting it rise about 1 degree/day until diacetyl rest with a similar amount of yeast, and age of yeast (no cell counts). I'm scratching my head trying to figure out what was different. Same recipe in the past had no prob.
I did do an acid rinse a couple days before on the FV and let it air dry to re-passivate. But I rinsed with water again thoroughly before sanitizing/filling, though with 55 degree water rather than 120, which was the acid rinse temp. That is the only thing different I can think of.
When it happened the one time before it showed signs at the end of day 2, on gen 6 of the yeast, but I dumped it afterward being skittish and new to the pro ranks. Wondering if I need to here with this one.
Any ideas?
- Doughed in, at around noon, then took about 17 lbs of wl002 English Ale yeast (4th gen, 3 days old) out of walk-in
- walk-in temp averages about 34-36
- Pitched at 64 degrees through manway at about 6pm after 30 minute knockout with 8 LPM O2 flow
- SG was 15.3p
All this is SOP and I've done it with this yeast about 25 batches since we opened last summer. On every occasion except one other time, the next morning shows significant bubbling. This time nothing. Nothing 24 hours later. Nothing 36 hours later. Checked and rechecked all valves were closed. Gravity had dropped 1p, but I had to almost question if my OG was really accurate. At 36 hours, gave it a blast of O2 to rouse. Waited until that night and with still no activity, or change in SG, gave it another longer blast of O2 and pitched another 5 lbs of yeast. Finally, the next morning, 2.5 days after pitch, it was rockin'.
Can't tell yet how it is going to turn out. I have pitched almost every batch (42) at 64 degrees, letting it rise about 1 degree/day until diacetyl rest with a similar amount of yeast, and age of yeast (no cell counts). I'm scratching my head trying to figure out what was different. Same recipe in the past had no prob.
I did do an acid rinse a couple days before on the FV and let it air dry to re-passivate. But I rinsed with water again thoroughly before sanitizing/filling, though with 55 degree water rather than 120, which was the acid rinse temp. That is the only thing different I can think of.
When it happened the one time before it showed signs at the end of day 2, on gen 6 of the yeast, but I dumped it afterward being skittish and new to the pro ranks. Wondering if I need to here with this one.
Any ideas?
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