Tony
Quality over Quantity
- Joined
- 26/4/04
- Messages
- 7,168
- Reaction score
- 276
Hi all
I .....as you have probably read ..... have been searching for a piece of MT false botton holy grail. The perfect material that is close to what the comercial lot use. something that will providea perfect runoff and sparging speed without having to throttle back outlets to stop compaction.
my false bottom is shit! It is too small and has a huge open percentage area whick leads to a stuck sparge in 30 seconds if i dont throttle it back with the outlet ball valve. Having to do this craps me up the tree.
After reading up on mash ton design in the thousands of pages of brewing science and practices PDF's i have i have found this info:
The true base of the tun is covered by a `false bottom' or deck. This
consists of interlocking slotted (or drilled in some small tuns) metal plates of gun-metal
or stainless steel or of stainless steel wedge wire (Figs 6.8, 6.9) mounted on short legs
about 57.6 cm (23 in.) above the true base. The plates interlock in a unique pattern and
can be lifted for cleaning or repairs. The slots give a free area of about 1012% of the
false bottom, while wedge wire gives the same or a higher value (up to 22%). The slots
are typically 0.71.0mm (0.0280.039 in.) wide at the top and widen out below to
facilitate cleaning and reduce the chances of fragments of grist wedging in the spaces.
and
While some plates may have drilled
circular perforations, most have slots typically 3040mm (about 1.21.6 in.) long and
0.60.7mm (0.0240.028 in.) wide. As with mash tun plates, these slots widen out below.
There may be 25003000 slots/m2 of plate area. Single milled plates may have a free area
of 68%, double milled plates up to 12% and wedge wire `plates' of 18% and even up to
25%. The plates provide little resistance to the flow of wort, relative to the resistance
provided by the bed of grain, and run off rates are the same with plates of 12 or 18% free
area
I have tracked down 304 stainless plate, 0.75mm thick with 1mm holes and a 2mm pitch with 24% open area. This is a lot more than they are talking about should be used but i think this will work fine in the home brewery, especially with a HERMS like mine. the phils ones sold elsewhere have an open area of about 35 to 40%
I only want a 500mm x 500mm section but all i can buy it in is a 1 meter x 1 meter section minimum.
It will cost me about 250$ delivered
I am putting out expressions of interst for anyone interested in buying an equal share in this sheet.
It will be devided into 4..... each costing $62.50. if you pay postage i will cut it and post it.
now this is not a definate happening thing yet as i still have a couple of leads to shase up but if i get stuck with more than i want i am just wondering if anyone out ther is interested in some as well.
I am in the hunter vally so pick up in this area would not be a problem
let me know and we will see if its viable.
cheers
tony
I .....as you have probably read ..... have been searching for a piece of MT false botton holy grail. The perfect material that is close to what the comercial lot use. something that will providea perfect runoff and sparging speed without having to throttle back outlets to stop compaction.
my false bottom is shit! It is too small and has a huge open percentage area whick leads to a stuck sparge in 30 seconds if i dont throttle it back with the outlet ball valve. Having to do this craps me up the tree.
After reading up on mash ton design in the thousands of pages of brewing science and practices PDF's i have i have found this info:
The true base of the tun is covered by a `false bottom' or deck. This
consists of interlocking slotted (or drilled in some small tuns) metal plates of gun-metal
or stainless steel or of stainless steel wedge wire (Figs 6.8, 6.9) mounted on short legs
about 57.6 cm (23 in.) above the true base. The plates interlock in a unique pattern and
can be lifted for cleaning or repairs. The slots give a free area of about 1012% of the
false bottom, while wedge wire gives the same or a higher value (up to 22%). The slots
are typically 0.71.0mm (0.0280.039 in.) wide at the top and widen out below to
facilitate cleaning and reduce the chances of fragments of grist wedging in the spaces.
and
While some plates may have drilled
circular perforations, most have slots typically 3040mm (about 1.21.6 in.) long and
0.60.7mm (0.0240.028 in.) wide. As with mash tun plates, these slots widen out below.
There may be 25003000 slots/m2 of plate area. Single milled plates may have a free area
of 68%, double milled plates up to 12% and wedge wire `plates' of 18% and even up to
25%. The plates provide little resistance to the flow of wort, relative to the resistance
provided by the bed of grain, and run off rates are the same with plates of 12 or 18% free
area
I have tracked down 304 stainless plate, 0.75mm thick with 1mm holes and a 2mm pitch with 24% open area. This is a lot more than they are talking about should be used but i think this will work fine in the home brewery, especially with a HERMS like mine. the phils ones sold elsewhere have an open area of about 35 to 40%
I only want a 500mm x 500mm section but all i can buy it in is a 1 meter x 1 meter section minimum.
It will cost me about 250$ delivered
I am putting out expressions of interst for anyone interested in buying an equal share in this sheet.
It will be devided into 4..... each costing $62.50. if you pay postage i will cut it and post it.
now this is not a definate happening thing yet as i still have a couple of leads to shase up but if i get stuck with more than i want i am just wondering if anyone out ther is interested in some as well.
I am in the hunter vally so pick up in this area would not be a problem
let me know and we will see if its viable.
cheers
tony