Calculating permeat removed from sap

[mol1jb]

Hey all,

I am looking for a formula to calculate how much permeat I am removing from sap. It is hard to tell on my tank markings because the permeat platform is built at a slant to help it fully drain. Yesterday I started with around 260 gallons sap at 2.2% sugar. I took several concentrate reading over the course of the boil averaging out to 5.1% concentrate. What formula could I use to calculate how much permeat was removed?

Thanks
Jacob

[maple flats]

Do you have a flo meter?

[mol1jb]

Yes but I usually adjust flow depending where I am in the boil. When I start the morning I usually recirulate 3/4 turn open to take more water out but after the evap gets going I have to lower recirc to keep pace with the evap so it isn’t the same flow throughout the boil

[ecolbeck]

Try this

C1V1=C2V2

C1 is starting concentration (%)
V1 is starting volume
C2 is ending concentration (%)
V2 is ending volume

[ecolbeck]

You would have to subtract the starting and ending volumes to determine the amount of permeate.

Vp=V1-V2

[mol1jb]

Try this

C1V1=C2V2

C1 is starting concentration (%)
V1 is starting volume
C2 is ending concentration (%)
V2 is ending volume

Ya I think that works out. By that calc I would end up with 112 gallons conc at 5.1% then I can subtract that from my original 260 giving me approx 148 gallons permeat removed.

[rlapointe]

Hi mol1jb,
I did my calculation slightly different than the posts above. I use this formula: % Permeat Removed = 1 - [Brix in/Brix Out] which doesn't require both volumes. Then I multiply the % (in decimal) by the initial volume. In you case, I get 1 - [2.2/5.1] = 57% removed then .57 x 260 = 148 gallons removed.