covered or not covered during hot wort stand

[dirtbikejunkie]

I brewed the firestone mission street clone and to simulate the hot whirlpool firestone performs I did a 15-20 hot wort stand before cooling. Out of habit I covered my kettle at the end of the boil since I normally start cooling and thus the hot wort sat covered. Is DMS a concern with a covered kettle during a hot stand? The boil was 90 minutes, is it sufficient that the DMS is completely boiled off?

on second thought, since I had placed my immersion chiller in prior the lid was not tight and at least a 1/2" vent at where the coils come out. I assume this would allow sufficient venting for dms to evaporate? never the less for future reference is it better to do a hot stand uncovered?

[NervousDad]

no worries after the 60 minutes boil the DMS precursors are gone 90 for lighter kilned malts(pilsen). I don't perform a whirlpool, but a sanitized lid goes on right way after the boil.

[hoodie]

Covered. You've boiled 90 minutes. Your not using a lot of Pilsner malt. You've done enough.

[BeaverBarber]

I do just what you did with every beer I make, and I've never had a beer taste like cooked vegetables...unless hops is a vegetable. I used to have the same concerns that you have, but it's turned out to be no problem at all for the reasons that NervousDad outlined.