GB/T 50485-2020 in English
VALIDTechnical standard for microirrigation engineering
- Issued on:2020-06-09
- Implemented on:2021-03-01
- File Format:PDF
- Delivery:Via email within 10 business days
$873.00
| Standard No: | GB/T 50485-2020 |
| Document status: | VALID |
| Title in English: | Technical standard for microirrigation engineering |
| Title in Chinese: | 微灌工程技术标准 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 10 business days |
| Issued on: | 2020-06-09 |
| Implemented on: | 2021-03-01 |
| Superseding: |
GB/T 50485-2009 Technical code for microirrigation engineering
|
| Professional Classification: | GB-National Standard |
| Related Keywords: | standard revision revision
technical standard new standard microirrigation engineering introduction key points water quality blockage risk assessment smart irrigation system construction |
| Related Topics: | en standard microdisk
term standard microdisk Technical standard quantification Micrometer technical indicators standard master trace Technical standard din Anti-microvibration engineering technology for electronic industry GBT50485 GB/T 50485-2009 GB/T 50485-2020 Micro-irrigation technology |
本标准适用于新建、扩建或改建的微灌工程规划、设计、施工、安装、验收和运行管理。
Introduction
Key points of standard revision
| Revision direction | 2008 version | 2017 revised version |
|---|---|---|
| Information management | Not listed separately | New chapter 3.6 |
| Hydraulic calculation | Traditional formula | Optimize sections 5.1-5.5 |
| Equipment requirements | Basic specifications | Strengthen sections 6.4-6.5 |
Analysis of key technology innovation
Breakthrough in hydraulic design
The new standard specifies the head loss coefficient of different pipes in Article 5.1.1:
- Hard plastic pipe: f=0.464/m=1.77/b=4.77
- Polyethylene pipe (LDPE): value according to Reynolds number conditions
New Article 5.5.3 water hammer pressure calculation formula: ΔH=C·ΔV/g, where the water hammer wave velocity C is directly related to the elastic modulus of the pipe
Implementation and application suggestions
Key points for equipment selection
According to the requirements of Article 6.4:
- Drip irrigation belts should use pressure-compensated emitters (Article 4.0.6 requires qv≤20%)
- Filter combinations need to refer to Table 3.3.2 Water quality blockage risk assessment
Smart irrigation system construction
According to the recommended monitoring system in 3.6.2:
| Soil parameters | Moisture content/temperature/EC value |
| Equipment status | Pressure/flow/blockage alarm |
Typical problem solutions
Case 1: Uneven irrigation on slopes
The uniform slope capillary hydraulic calculation method in Appendix B, combined with the pressure compensation dripper (defined in Article 2.1.9), can solve the flow deviation of ≤20%
Case 2: Water quality treatment plan
When the Fe content in the water is greater than 1.5 mg/L (high risk value in Table 3.3.2), secondary treatment of centrifugal filter + sand and gravel filter should be adopted according to Article 6.2
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