LS/T 1225-2022 in English

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Standard No:	LS/T 1225-2022
Document status:	VALID
Title in English:	Code of practice for nitrogen controlled atmosphere technology in grain storage
Title in Chinese:	氮气气调储粮技术规程
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2022-07-18
Implemented on:	2023-01-18
ICS Classification:	65.020.01-Farming and forestry in general
Chinese Classification:	B20-Cereal crop and forage crop in general
Professional Classification:	LS-Cereal
Related Keywords:	half-life ≥300s nitrogen concentration insect prevention ≥95 % grain storage introduction analysis typical application scenarios take rice storage putty nitrogen production grain temperature
Related Topics:	Nitrogen nitrogen gas grain gaseous nitrogen Nitrogen psi Nitrogen+psi gas nitrogen Gas storage technology gaseous nitrogen China grain storage Gas phase nitrogen tank Nitrogen collection nitrogen nitrogen nitrogen air machine Nitrogen curtain zero gas nitrogen nitrogen curtain gas Nitrogen for gas phase Nitrogen for gas phase reserve grain storage en nitrogen air conditioning Nitrogen technology nitrogen and oxygen Nitrogen Xiao Nitrogen degassing Xu Chuliang Nitrogen pipeline ls/t 3245 Curtain Nitrogen Nitrogen pump Nitrogen volume East grain storage Nitrogen pipeline nitrogen gas Nitrogen Safety Regulations nitrogen Nitrogen detector Gas storage well engineering technology Air conditioner nitrogen air tightness test Nitrogen probe China grain storage industry Nitrogen related

Introduction

Analysis of the core content of the standard

Technical elements	Requirements for flat warehouses	Requirements for shallow round warehouses
Airtightness standard	GB/T 25229 Level 2 and above	500→250Pa half-life ≥300s
Nitrogen concentration	Insect prevention ≥95%, insecticide ≥98%, storage 90-95%
Detection point layout	9 points on 3 floors + 1 point inside the warehouse	9 points on 2 floors + 1 point inside the warehouse

Appendix A of the standard specifies in detail the leakage treatment plan for different warehouse types:

Wall treatment: Use water-based sealing paint or polyurethane epoxy resin material, and fill the cracks with acrylic paint mixed with putty
Nitrogen production equipmentSupporting requirements: It should comply with JB/T 6427 standard, and the output purity should be ≥99.5%
Process hole sealing: The vents are sealed with PVC film, and the cable holes are sealed with polyurethane material

Take rice storage in South China as an example:

Start insect prevention mode (95% concentration) when the grain temperature reaches 20℃ in April and May
Immediately switch to insecticide mode when insect pests are found (98% concentration maintained for 28 days)
Combined with mechanical ventilation to disperse air in autumn and winter to prevent condensation

Risk type	Prevention and control measures
Hypoxia risk	O₂≥19.5% before entering the warehouse, equipped with air respirators
Equipment safety	Regular inspection of pressure vessels and monthly leakage detection of pipelines
Operational specifications	Strictly implement the "three simultaneous" principle (inflation/detection/protection)

More samples: DL/T 368-2010 GB 50021-2001(2009) QC/T 942-2021

Sample only — not a preview of LS/T 1225-2022

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