GB/T 42228-2022Grain storage—Technical specification for rice storage (English PDF)

1 Scope

This document specifies the essential requirements for warehouse facilities and equipment, intake requirements, monitoring and treatment during storage, technical storage requirements, and out-loading requirements for the safe storage of rice, and describes the corresponding verification methods.

This document is applicable to the safe storage of packaged commercial rice in flat-roofed storehouses.

2 Normative References

The contents of the following documents constitute indispensable clauses of this document through normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document.

GB/T 1354 Milled rice

GB/T 8946 General technical requirements of plastic woven sack

GB/T 20569 Guidelines for evaluation of paddy storage character

GB/T 22497 Grain and oil storage - Fumigants application guideline

GB/T 24904 Gunny bags for packing of grain

GB/T 29374 Grain and oils storage -Code of practice for applicative technology of grain chiller

GB/T 29890 Technical criterion for grain and oil-seeds storage

GB 50320 Code for design of grain storehouses

LS/T 1201 Phosphine fumigation technical regulation for grain storage

LS/T 1213 Code of practice for carbon dioxide controlled atmosphere in grain storage

3 Terms and Definitions

This document contains no terms or definitions that require clarification.

4 Essential Requirements for Warehouse Facilities and Equipment

4.1 Warehouse conditions regarding dust prevention, explosion protection, and illumination - as well as conditions required for low-temperature storage technology - shall comply with the relevant requirements of GB/T 29890.

4.2 Warehouse design shall comply with the requirements of GB 50320. Explosion-proof lighting fixtures shall be installed inside the warehouse, and the airtightness of the warehouse shall comply with the provisions of LS/T 1201.

4.3 The warehouse shall comply with the requirements for grain ventilation, airtightness, moisture resistance, and thermal insulation; it shall minimize the impact of adverse environmental conditions - particularly high temperature and high humidity - on the rice and prevent infestation by harmful organisms.

4.4 A suspended thermal insulation ceiling layer should be installed beneath the inner surface of the warehouse roof. The warehouse roof shall be intact and watertight; the exterior surface should feature a light-colored coating or a sprayed-on solar radiation-reflective material.

4.5 The grain-filling line shall be clearly marked on the inner surface of the warehouse walls, and the exterior surface of the walls should be white.

4.6 The structures of doors, windows, and ventilation openings shall be tight and incorporate thermal insulation and sealing measures. Insect-proof lines and rodent/bird-proof barriers or screens should be installed at doors, windows, and openings.

4.7 The interior space of the warehouse shall accommodate the operational needs of transport and intake/out-loading equipment.

4.8 The warehouse interior shall be clean and sanitary, free from contamination by insects, mold, or harmful substances.

4.9 Necessary grain storage facilities and equipment shall be provided based on specific grain storage ecological conditions, warehouse type, and actual needs. For rice warehouses with a storage period exceeding three months, it is advisable to equip them with a monitoring and control system of stored-grain condition which is compliant with the provisions of GB/T 26882.1, a mechanical ventilation system which is compliant with the provisions of LS/T 1202, sampling equipment, and specialized refrigeration and cooling equipment for grain storage which is compliant with the provisions of GB/T 18835.

5 Requirements for Rice Intake

6 Monitoring and Treatment During Storage