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Equipment · Tanks and vats
Wine fermenter with pomace door · Stainless wine fermentation tank
A modern stainless wine-fermentation tank whose bottom-level access on red-wine models helps remove grape skins and seeds; door, outlet, cooling and capacity details vary by model.
Stainless wine fermenters belong to modern commercial winemaking. The consulted manufacturer catalogue describes a current product family; it does not establish when the general tank form first appeared or identify a single place of origin. This page focuses on a particular design feature: low access intended to make the removal of red-wine pomace practical. It is a manufactured tank that can be installed in a winery, not a tank built into the site.
In red-wine fermentation, grape skins and seeds remain with fermenting juice. The top of this mass forms a cap that winemakers manage during fermentation; after processing, solids must be removed from the vessel. The Paul Mueller red-wine configuration places an outside-opening access manway flush with the tank bottom, with an outlet connection. That low opening is the defining feature for this entry: it allows access near the solids rather than requiring every red-wine tank to use the same top or side opening. The tank is not itself a pomace press, and the opening does not specify a single method for managing the cap.
The product family makes clear that “wine fermenter” does not describe one universal door. The manufacturer's red-wine model has an 18-inch outside-opening manway at the tank bottom. Its white-wine tank instead has a side-entering, inswing manway listed at 16 by 20 inches. The brochure gives corresponding outlet sizes for those configurations. These dimensions belong to the manufacturer's specified models; they are not standards for every wine fermenter. A mixed-use or custom tank should be understood from its own drawings and fittings.
The listed tanks use a heat-transfer surface to support cooling, and the manufacturer describes operation with glycol or ammonia refrigeration systems. Thermowells provide locations for temperature monitoring. Racking connections, a top vent, side drain and optional sample valves serve different functions: transferring clearer wine, draining the vessel, venting and sampling. Some tanks can be insulated or fitted with an outer jacket. Those additions are options, not defining features of every stainless wine tank; cooling equipment and instrumentation also vary by installation.
The manufacturer describes Type 304 stainless as a standard construction material and lists Type 316 or 316L options. Its product page gives capacities for individual models spanning 500 to 12,000 US gallons, with dimensions that change by size. Those figures help readers understand the scale of one commercial product range, not a type-wide capacity rule. Stainless avoids the oak contribution of a new wooden vessel, but it does not make every wine made in steel taste alike: grape variety, fermentation management, temperature and other cellar choices remain consequential. The consulted source does not assign one pressure rating to the whole product family, so pressure use must be checked against the exact vessel's documentation.
The consulted manufacturer catalogue documents current commercial wine tanks but does not date the origin of the general form.
Pressure rating is model-specific and is not established for the general equipment form; confirm the exact tank documentation before pressurizing.
Hazard sourceUse only the pressure rating and operating instructions documented for the exact model.
Control sourceThe bottom-level outside-opening manway and its outlet are described for red-wine models; white-wine tanks use a different side-entry, inside-closing access configuration.
Source →Pressure capability depends on the exact model; no general pressure rating is assigned here.
Source →Sources identify a current commercial wine-tank product but do not establish the design's geographic origin or all manufacturing locations.
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Paul Mueller CompanyManufacturer product specification
Wine FermenterWine fermenter form and fittings; red- and white-wine access configurations; optional features and model-dependent capacities.
Cited in: History and scope; The pomace opening; A tank configured for red or white wine; Cooling and other fittings; Material, capacity and limits
Paul Mueller CompanyManufacturer technical brochure
Wine Processing Equipment BrochureStainless grades, tank construction, temperature-transfer options and exact red/white manway configurations.
Cited in: History and scope; The pomace opening; A tank configured for red or white wine; Cooling and other fittings; Material, capacity and limits