Mash/Lauter Tun Design and Construction Choices for Homebrewers By Cole Davisson.

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Presentation transcript:

Mash/Lauter Tun Design and Construction Choices for Homebrewers By Cole Davisson

MashTun vs. Lauter Tun Mash Tun- A brewing vessel designed to hold a mash at a constant or increasing temperature Lauter Tun- A brewing vessel designed to filter wort from spent grains of a mash after conversion Homebrewers commonly use a dual-purpose mash/lauter vessel

Mashing Mechanisms Single Temperature Infusion Step Mash – Multiple Infusions – Decoction – Applied heat

Vessel Requirements Needs to hold an appropriate amount of liquid Aspect ratio and volume will determine depth of grain bed Needs to be able to maintain temperature over the period of a rest

Some Common Vessel Choices Food-grade Plastic Buckets

Some Common Vessel Choices Insulated Bucket

Cylindrical Coolers

Rectangular Coolers

Converted Kegs

Kettle-based Mash Tuns

Purpose-built Mash Vessels

Less Popular Choices…

Lautering Mechanism Strainer Requires scooping of hot mash from mash tun into strainer Many brewers are concerned about the effects of ‘Hot-side Aeration’

Lautering Mechanism Bucket-in-a-bucket

Lautering Mechanism Purpose-built False Bottom – Plastic or metal – Hinged – Legs or Domed – Outlet above or below

False Bottoms

Manifolds

Metal Hose Braid

Sources for Metal Braid

Sparging No Sparge Batch Sparge Fly Sparge (or Continuous Sparge)

No Sparge Calculate strike water volume and gravity of extract expected. Mash Drain off high-gravity wort Top off to reach final, pre-boil volume

Lautering Considerations Because you are draining the mash tun completely in one step, the choice of lautering technology is not particularly critical. So long as you don’t have dry patches in your grainbed, false bottom, manifold or braid should all perform equally well.

Batch Sparge Mash Drain off high-gravity wort until dry Add hot sparge water and stir to combine Drain off lower-gravity wort until dry Repeat until satisfied…

Lautering Considerations The sparge operation is a diffusion process, rather than a rinsing process. Like with No Sparge, all of the wort is drained in one step. Like with No Sparge, any of the lautering choices should work equally well.

Last note on batch sparging substantial amount of sugar is present and diffuses into sparge water in the last sparge operation pH of sparge water never rises to the level that husk tannins are extracted ‘impossible to oversparge’

Fly Sparge Continuously rinsing the grain bed to extract as much sugar from the grain as practical Slow sparging can take up to an hour Many brewers do a mashout to denature enzymes to combat further conversion during sparge

Fly Sparge Water is added uniformly across the top of the grain bed, at the same rate as wort is run off As sparge water trickles down through filter bed, it rinses away interstitial sugars Wort drawn continuously off the bottom of the grain filter bed

Lautering Considerations Sparge water must be uniformly distributed across top of grainbed

Lautering Considerations Uniform distribution of sparge water and uniform distributed collection discourage channeling Because water flows through the path of least resistance, if channels form, sparge will not collect sugar from other portions of grain bed Efficiency will suffer Most breweries use false bottom and sparge arm

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