Partial mash calculation questions

[JayberQue]

Okay so i am getting ready to brew a partial mash/batch sparge dunkleweizen. The recipe isn't exactly essential to my question so i will skip it. But it will have 6 pounds of grain and 3 pounds of extract. This is going to be a six gallon batch.

When i am trying to add this recipe to beersmith 2 it is telling me to mash the grains and batch sparge 3 steps to achieve the entire boil volume of 7.13 gallons of wort and then add the extract. Essentially it is telling me to make 7 gallons of 1.026 wort and add the extract to that

Would it be better to mash the grains and collect 5.05 gallons of wort (approx 1.038), being the 2/3rds of the grain bill and pre-boil volume and then add the rest of the water and the extract to the boil kettle?

 

[chickypad]

The main concern with oversparging like that would be the extraction of tannins. With batch sparging you have a bit more leeway, but that still seems like a lot to me. Personally I would just do a single batch sparge and collect what would be a more normal volume for that grainbill, say about 3 qts per lb total mash + sparge.

 

[JayberQue]

thats what i was thinking... i am just going to do the mash/batch sparge based on the grain bill and add the rest of the water and extract to what i collect for that to get to volume/og. You would think beer smith would have a way to separate the partial mash portion from the total boil volume.

 

[WoodlandBrew]

If your temperature is below 170°F and pH is below 6 you shouldn't have a problem with tannin extraction. Doing three sparges will increase your efficiency, but take a little more time.