Just to give you a perspective on bittering (IBUs) from various hop additions, especially whirlpool hops.
Note: these results are estimated by Beersmith 3 and seem to confer with a different, online, post boil IBU calculator.
Key is, you get quite a bit of IBUs from whirlpooling large(r) amounts of hops typically for IPAs and NEIPAs.
I posted these findings in another thread 2 months ago:
For my NEIPAs (5.5 gallon batch) I use 7 or 8 grams of Warrior at 60' giving ~
15 IBU.
Then 4-6 oz of a mix of "IPA hops" in a reduced temp whirlpool:
- Half at 170F for 10'
- The other half at 150F for 30'
- Then chilling down to ferm temps
According to BeerSmith 3 I only gain
9.9 IBU from 90 grams (~3 oz) of 15.5 %AA of hops (average %AA of the hop mix) at 170F for 10'. And
8.4 IBU from the exact same amount of hop mix at 150F for 30'.
Total IBU: 15.3 (60' boil) + 9.9 (170°) + 8.4 (150°) = 33.6
That resulting beer tastes a bit more bitter than 34 IBU, maybe 40 (45?), especially noticeable toward the end of the keg when the original thick milkshake has been reduced to a much thinner haze. So...
The hops are pellets and bagged (I use a plate chiller) and massaged or drained around every 5 minutes to refresh the wort inside the bags for better extraction.
I sometimes feel I can omit the Warrior altogether. Or perhaps substitute the Warrior with a small charge of a similar mix of IPA hops at 5' (before flameout) or increase the 170' hops charge for extra bitterness and flavor. Many possibilities.