GB/T 44693.2-2024 in English
VALIDProcess stability of hazardous chemical enterprises—Part 2: Technical specification for control loop performance evaluation and optimization
- Issued on:2024-09-29
- Implemented on:2025-04-01
- File Format:PDF
- Delivery:Via email within 5 business days
$447.00
| Standard No: | GB/T 44693.2-2024 |
| Document status: | VALID |
| Title in English: | Process stability of hazardous chemical enterprises—Part 2: Technical specification for control loop performance evaluation and optimization |
| Title in Chinese: | 危险化学品企业工艺平稳性 第2部分：控制回路性能评估与优化技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2024-09-29 |
| Implemented on: | 2025-04-01 |
| ICS Classification: | 13.200-Accident and disaster control |
| Chinese Classification: | E09-Hygiene, safety and labor protection |
| Professional Classification: | GB-National Standard |
| Related Keywords: | control loop ledgers
three-level control loop management system loop performance evaluation automatic control effective automatic control rate |
| Related Topics: | Chemical company
|
《GB/T 44693.2-2024危险化学品企业工艺平稳性 第2部分：控制回路性能评估与优化技术规范》由TC251（全国危险化学品管理标准化技术委员会）归口，主管部门为国家标准委。
Introduction
Analysis of standard technical framework
| Core modules | Technical requirements | Implementation points |
|---|---|---|
| Performance evaluation system | Four-dimensional indicators of automatic control rate/effective automatic control rate/stability rate/accuracy rate | Comprehensive score is calculated using the formula P=(A×a+F×f+S×s)/(a+f+s)×R |
| Fault diagnosis | Identification of eight major faults | Combined with multi-indicator analysis such as oscillation rate/viscosity coefficient/saturation rate, etc. |
| PID optimization | Reaction curve method/attenuation method/Lambda tuning method | The controlled object model identification must be completed first |
Key performance indicator implementation specifications
The standard requires enterprises to establish a three-level control loop management system:
- Primary loop: core control point that directly affects the safety of the device (such as interlocking related), weight coefficient 3
- Secondary loop: auxiliary control point that affects operational stability, weight coefficient 2
- Third loop: conventional process parameter control point, weight coefficient 1
Typical optimization case: A petrochemical enterprise shortened the steady-state time from 120s to 45s and increased the stability rate by 22% by adjusting the PID parameters of the temperature control loop
Technological evolution and innovation
Compared with traditional methods, this standard highlights three major innovations:
- Introducing the concept of effective automatic control rate to distinguish between pure automatic control state and actual adjustment effect
- Establishing a dynamic response analysis method based on the ARMA model (see Appendix F.4)
- Recommending the use of OPC UA architecture to achieve data collection standardization (Article 6.2.1)
Enterprise implementation suggestions
| Stage | Work content | Period |
| Infrastructure construction | Complete the establishment of control loop ledgers and deployment of data acquisition systems | 3-6 months |
| Evaluation and diagnosis | Carry out the first round of performance evaluation and identify the fifth-level loop | Continue every month |
| Optimization and improvement | Implement PID parameter optimization for loops below level 4 | Quarterly special |
Note: It is recommended to give priority to high-risk loops with a saturation rate>15% or an oscillation rate>30%
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