hot liquor and cold liqur tanks & Brewhouse general area

Overview of Hot and Cold Liquor Tanks

  • Importance in Brewing: Hot and cold liquor tanks are integral to the brewhouse and require regular cleaning and sanitation.
  • Soil Loads: Typically low levels of organic or inorganic materials, but attention is still needed.

Organic and Inorganic Contaminants

  • Organic Materials: Often come from accidentally sending wort (brewing liquid) into these tanks.
  • Inorganic Materials: Can build up quickly in hot liquor tanks due to heat driving out total dissolved solids (TDS).

Water Quality Concerns

  • Chloride Ions: Primary cause of stress corrosion cracking in tanks.

    • Critical Concentration: Must be kept below 50 PPM (parts per million).
    • Avoid Calcium Chloride Treatments: Do not add calcium chloride directly to tanks.

  • Chlorine Elimination:

    • Use of carbon filters to remove chlorine from municipal water is important.
    • Monitor filters closely since chlorine reacts with organic materials to form chlorophenols, which can add undesirable flavors to the product.

  • Corrosive Nature of Free Chlorine:

    • Can create chlorinated vapors in poorly vented tanks, leading to corrosion and potentially catastrophic failure.

  • Well Water Concerns:

    • May contain high iron and manganese levels which can precipitate and accumulate.

Impact of Inorganic Materials

  • Equipment Damage: Excessive mineral deposits can reduce flow rates in processing piping.
  • Machine Contamination: Accidentally introducing caustic materials renders water undrinkable and unsuitable for brewing.
  • Microbiological Risk: Allows the potential for contamination if wort enters liquor tanks.

Cleaning Methods

  • Cleaning In Place (CIP): Preferred method for cleaning these tanks, focusing on acid cleaning due to low organic loads.

  • Effective Cleaners:

    • Phosphoric-Nitric Acid Blends: Removes mineral deposits and passivates stainless steel surfaces.
    • Peracetic Acid: Recommended for sanitation after cleaning.

  • Frequency of Cleaning:

    • Ideally quarterly or monthly, but must be immediate if chemicals or any disruptive material enters the tanks.

General Brewhouse Cleaning Practices

  • Overview: Areas around the brewhouse should maintain good housekeeping to promote safety and efficiency.

  • Soil Types:

    • Organic Soils: Includes spills or debris from brewing ingredients (grains, hops, etc.).
    • Inorganic Soils: Often arise from packaging materials or chemical spills.

  • Impact of Soil Loads:

    • Low direct impact on product quality, but may lead to incorrect ingredient use if work areas are cluttered.
    • Hazards exist from chemical spills, requiring immediate cleaning to ensure worker safety and product integrity.

Cleaning Methods in Brewhouse Areas

  • Basic Cleaning Techniques: Sweeping and adhering to good housekeeping practices.
  • Chemical Safety: Exercise caution when using cleaning chemicals to avoid skin contact.
  • Floor Cleaning: Quaternary ammonium compounds (quads) are effective for cleaning and sanitizing.

Production Scheduling**

  • Time Management: Proper scheduling is essential to ensure brewhouse areas are kept clean, organized, and safe, reducing accident risks and enhancing the work environment.