ISO 6822:1984

Overview

ISO 6822:1984 is an international standard that provides a comprehensive guide for the storage of potatoes, root vegetables, and round-headed cabbages in silos using forced ventilation. Developed by ISO Technical Committee ISO/TC 34, this standard establishes methods to regulate storage conditions by utilizing outside air ventilation systems. The primary goals are to reduce post-harvest losses, minimize labor during storage, and maintain the quality of agricultural products throughout storage periods.

This standard is particularly effective for moderate climate regions where harvest temperatures range from 0 to +2 °C or lower at night. It covers all key stages including harvesting, preparation of the storage site, ventilation system design and operation, loading/unloading techniques, and routine condition checks.

Key Topics

• Storage Site Preparation and Silo Construction

  • Select flat sites with minimal slope and underground water depth of 1.5 to 2 meters
  • Ensure proximity to transport routes and electricity supply
  • Use fixed or provisional silo constructions varying in dimensions based on regional needs (typically widths 3-5 m, heights 1.3-2 m, lengths 15-30 m)
  • Opt for materials such as wood, sawdust, peat, straw, or modern insulating foams for covering silos

• Forced Ventilation System

  • Equip silos with inlet and outlet air channels connected to fixed or mobile fans controlled electrically or manually
  • Airflow rates from 50 to 100 m³ per tonne per hour, adjusted for local climate conditions and product moisture levels
  • Use underground brick, concrete, or wooden distribution channels or surface transportable tubes made from wood, tinplate, or polymeric materials
  • Maintain air velocities of 3-6 m/s with pressures from 15 mm H₂O, increasing as needed for damp products

• Harvesting and Storage Conditions

  • Store well-formed, ripe, healthy, and frost-free vegetables grown under standardized agricultural conditions
  • Harvest and store products to meet quality standards appropriate for human consumption, seed use, or fodder
  • Load silos promptly to enable immediate ventilation and prevent air leaks

• Ventilation Techniques

  • Continuous drying using appropriately tempered outside air to prevent product damage
  • Air cooling during cooler periods to maintain product temperatures at approximately:
    • Round-headed cabbage: not less than -1 °C
    • Root vegetables: not less than 0 °C
    • Potatoes: not less than 2 °C
  • Regulate and monitor fans and valves either automatically or manually

• Monitoring and Maintenance

  • Daily temperature measurements inside silos using thermometers or thermocouples
  • Periodic airflow checks using anemometers to ensure uniform ventilation
  • Monthly product condition analyses through bulk sampling methods
  • Regular cleaning, drying, and disinfection of silos before storage season
  • Inspection and repair of silo coverings, ventilation channels, electrical systems, and control equipment

Applications

ISO 6822:1984 serves a vital role in optimizing the storage of perishable agricultural products to extend shelf life, reduce losses, and preserve quality. Key applications include:

• Agricultural Storage Facilities
  Storage operators can design and manage silo-based storage systems for root crops using forced ventilation to maintain controlled atmospheres.

• Post-Harvest Handling and Logistics
  The standard guides the integration of ventilation technology into harvesting workflows, improving the efficiency of loading, unloading, and temperature regulation.

• Seed and Fodder Management
  The methodology supports storage conditions tailored for specialized storage requirements such as seed preservation or fodder stockpiling.

• Climate-Adaptive Storage Solutions
  Particularly useful for regions with moderate climates, ISO 6822 aids in designing ventilation systems that adapt to daily and seasonal temperature fluctuations for optimal product conservation.

Related Standards

For comprehensive storage and post-harvest management of agricultural products, ISO 6822:1984 should be considered alongside related international standards such as:

• ISO 677:1984 - Potatoes-Guide to storage in bulk using ventilation
• ISO 7301:1983 - Round cabbage classification and quality standards
• ISO 11220:1998 - Fruit and vegetables - Sampling for quality control
• ISO 13918:2017 - Ventilation systems for storage facilities-General requirements

These standards collectively ensure a harmonized approach to the quality assurance and preservation of root vegetables and related produce during storage and distribution.

Keywords: ISO 6822, potato storage, root vegetable storage, round-headed cabbage, silo ventilation, forced ventilation system, agricultural product storage, post-harvest losses, ventilation techniques, storage silos, temperature control in storage, agricultural standards.