Mash Tun Capacity and Grain Bed Depth

Computes grain bed depth in a mash tun, the largest grain bill its depth limit allows, and the strongest single-mash beer. The worked 6 ft tun holds 542 lb at 12.1 in and at most 808 lb at 18 in, which caps the brewhouse at 1.075. An 8 ft tun takes 78% more grain from a 33% wider vessel.

mash gal per lb = R/4 + displacement; depth = G x gal per lb / 7.48 / (pi D^2 / 4); max grain = area x depth limit x 7.48 / gal per lb.

Geometry, with grain displacement about 0.08 gal per lb and 12 to 18 in the usual working bed depth. The lauter tun manufacturer's rated depth governs.

Public geometry.

Estimate. AHJ and licensed professional govern.

Field names used by the API: tun_diameter_ft, grain_weight_lb, mash_thickness_qt_per_lb, grain_displacement_gal_per_lb, max_bed_depth_in, batch_volume_gal, efficiency_pct, extract_potential_ppg, alternative_diameter_ft, bed_area_sqft, mash_volume_gal, bed_depth_in, max_grain_lb, max_og_points, alternative_bed_depth_in, alternative_max_grain_lb

• Vessel a flat-bottomed cylinderspec-v1787