Mash Volume Calc

[Kieren]

Just wondering what people use to calculate their mash volumes.

Last night I came up with some formulae using J. Palmer's How to Brew to see how much water I could add to my mash tun and hence a maximum water:grain ratio that could be used for a certain amount of grain.

Vm = Vt - 0.6466 * Gb

where
Vm is total water used for mash (L)
Vt is volume of mash tun (L)
Gb is weight of grain (kg)

Or alternatively

Vt = Gb (1.6466 + (Rb - 1))

where
Vt is total volume of mash (L)
Gb is weight of grain (kg)
Rb is mash water to grain ratio (L/kg)

Will actually test these out this weekend to see how acurate they are.

Does anyone do anything similar?

Kieren

 

[Darren]

Many years ago I did. These days i put the grain in the tun, then let the water come up from below. Doing this you could fill the tun almost to the top with grain no problems.

cheers

Darren

 

[Millet Man]

Water volume plus 2/3 litre per kg of malt (eg: 3 litres volume for 4.5 kg) is close enough. In my small setup, 12 lt water and 3 kg malt equals 14 lt mash and fits nicely in a 15 lt stock pot.

Cheers, Andrew.

 

[matti]

3 part to 2 ratio for thick mash and longer ferments. 5 to 3 ratio for thin quick fermenting mash.
personnally I try to follow recipes.
Albeit I had to convert an AG to partial using imperial to metric.
I use 2/3 of total brew liquid in doughing in and use remains to control temp before saccharification rest. Especially using decoction methods.
Matti