LS/T 1213-2022 in English

VALID

Code of practice for carbon dioxide controlled atmosphere in grain storage

Issued on:2022-07-18
Implemented on:2023-01-18
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $250.00
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Standard No:	LS/T 1213-2022
Document status:	VALID
Title in English:	Code of practice for carbon dioxide controlled atmosphere in grain storage
Title in Chinese:	二氧化碳气调储粮技术规程
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2022-07-18
Implemented on:	2023-01-18
Superseding:	LS/T 1213-2008 Technical regulations for controlled atmosphere storage of grain by purging carbon dioxide
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:	grain storage introduction background green grain storage technology insect-free grain wheat ≤2.5 corn ≤2.5 rice ≤2.5 application finished grain gas supply system storage
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Introduction

Background of Standard Revision and Technological Evolution

As the first revised version of LS/T 1213-2008, this standard mainly responds to the development needs of green grain storage technology, and focuses on adjusting the following contents:

Revision dimensions	2008 version	2022 version
Safety management	Single clause	Independent chapter (Chapter 7)
Airtightness test	Original calculation method	Update Appendix B Table B.1
Scope of application	Finished grain not specified	Instructions for rice application added

Analysis of core technical requirements

1. Air tightness standard of granary

Gas-controlled silo must meet the following requirements:

Empty silo: 500Pa→250Pa pressure half-life ≥300 seconds
Full silo: 500Pa→250Pa pressure half-life ≥240 seconds

Test method example

The positive pressure decay test method in Appendix A is adopted, with a 700-1000Pa fan and a ±10Pa precision pressure gauge, and the lowest value is taken for judgment through three repeated tests.

2. Gas concentration control system

Airtightness level	Pressure half-life(s)	Target concentration(%)
Level 1	≥360	60
Level 2	240-360	70

The concentration must be maintained at 35% or above for 15 days. The weighted average concentration calculation is shown in Appendix D.

Key equipment configuration requirements

1. Gas supply system

Storage and transportation equipment: in accordance with GB 150.1 pressure vessel standard

Gas transmission pipeline: GB/T 8163 rust-free steel pipe

Safety valve: GB/T 12241 standard

2. Detection system

The carbon dioxide analyzer must meet the 0-100% range and ±2% error. PE sampling tubes are prohibited.

Implementation suggestions and risk control

1. Operation process optimization

Perform 7-point control inspection before inflation (silo roof/grain surface/upper, middle and lower layers/space/exhaust port)

Adopt two-stage pressure reduction control (1.0±0.2MPa)

Circulation requirement of 5 air replacement rates per hour

2. Safety protection measures

Equip with 3 or more GB/T 16556 respirators

When CO₂ concentration is ＞2%, double-person supervision is required

Anti-freeze gloves are required for liquid CO₂ pipeline operation

Application effect evaluation indicators

Grain types	Unit gas consumption (kg/t)	Insecticide standard
Rice	≤3.0	GB/T 29890 Insect-free grain
Wheat	≤2.5
Corn	≤2.5
Rice	≤2.5

More samples: NB/T 47013.2-2015 QC/T 942-2021 GB 50021-2001(2009)

Sample only — not a preview of LS/T 1213-2022

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