How much longer would this take.

[Prairiepiss]

If you are making a neutral. You didn't say? Count on a 12 to 14 hour run.

[maheel]

a lot longer but you will have WAY more stock in the cupboard

[Bushman]

Depending on your boiler size your not going to charge a keg to 15 gallons, maybe 12. But even 12 gallons with a 2" column I would allow 12-14 hours to make neutrals.

[Just a Biker]

If the Boka was 3" it would reduce the time needed. Could someone estimate the difference between a 2" and 3" with the same rig?

[Mazriam]

3 inches is a third larger than 2 inches. Without confirming the numbers, or theory, I would say you could run a third faster.

12% wash, 3 hours, on 2 inches would be 2 hours on 3 inches.

[Cu29]

3" is 50% bigger. The area is 9/4ths bigger.

[Mazriam]

ok, so i took the time to crunch the numbers

a 3 inch pipe has 55.5% more volume over a 2 inch pipe.

a 3 hour run on your boka, theoretically, would take, roughly 1.6 hours on a 3 inch pipe. Assuming you have enough heat to drive the same vapor speed in a 3 inch pipe as you have in your 2 inch pipe. this will also allow a faster take-off speed.

Realistically, i would say you can shave 1 hour off your run time.

[Prairiepiss]

You are both wrong. Surface area across a 3 inch is more the twice that of 2". Actually 2.25 times the size. Surface area of a 2" is 3.14159 square inches. A 3" is 7.06858 square inches. So that would be what 125% larger?

But calculating the speed of a 3" compared to a 2" isn't just that easy. It would get you close. But to many factors come into play.

[Cu29]

3" pipe has no volume in this consideration

Pi r^2 is the area, so 1 Pi is the area of 2" pipe.
2.25 Pi is the area of 4" pipe.

225% (2.25/1) more vapor (assuming your boiler can make enough vapor)

[Cu29]

Oh right r not d. PP is right. Anyway there is no volume involved.

(Puts his bourbon down)

[Mazriam]

You are both wrong. Surface area across a 3 inch is more the twice that of 2". Actually 2.25 times the size. Surface area of a 2" is 3.14159 square inches. A 3" is 7.06858 square inches. So that would be what 125% larger?

But calculating the speed of a 3" compared to a 2" isn't just that easy. It would get you close. But to many factors come into play.

The volume of a given pipe is calculated as follows: pi * r(squared) * height

3 foot pipe, 1 inch radius, has a total volume of 1853 cubic centimeters

3 foot pipe, 1.5 inch radius, has a total volume of 4169 cubic centimeters

A 3 inch pipe has 224.98% more volume.

theoretically, a 3 inch pipe would cut your run time, drastically...But PP is right, other things come into play that determines your run time. I still stand behind my last comment of being able to shave at least 1 hour off your run time though...provided you can maintain the same vapor speed in the 3 inch pipe as you do in your 2 inch pipe, and adjust your take off.

[Prairiepiss]

The volume of the column isn't what we would be concerned with. It would be the vapor path size. Which would be the cross section surface area of the pipe. But even then you would have to take into account the packing within that column too. And how tightly it is packed.

Speed wise also depends on amount of heat applied. Or how much heat is available to apply. Knockdown power of the condenser, Packing materials, How tight those packing materials are, take off valve size, insulation, ambient temps, what ABV the wash is. Just to name a few.