GB/T 25146-2010 in English
VALIDQuality acceptance specifications of chemical cleaning for industrial equipment
- Issued on:2010-09-26
- Implemented on:2011-04-01
- File Format:PDF
- Delivery:Within 1 day
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《GB/T 25146-2010工业设备化学清洗质量验收规范》由TC429（全国化工机械与设备标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
Introduction
In-depth interpretation of GB/T25146—2010 Quality Acceptance Standard for Chemical Cleaning of Industrial Equipment
Background and Significance of Standardization
GB/T25146—2010 Quality Acceptance Standard for Chemical Cleaning of Industrial Equipment is an important national standard formulated to address quality issues in the process of chemical cleaning of industrial equipment. The standard was proposed by the China Petroleum and Chemical Industry Association and is managed by the National Technical Committee for Standardization of Chemical Machinery and Equipment. It aims to unify the industry's cleaning quality requirements and ensure that industrial equipment can be used safely, reliably and efficiently after chemical cleaning.
Types of dirt and their classification
According to the standard appendix, the dirt in industrial equipment is mainly divided into the following categories:
| Type of dirt | Main component | Color | Simple qualitative identification method |
|---|---|---|---|
| Carbonate scale | CaCO3 not less than 60% | Off-white | Dissolved in 5% hydrochloric acid solution and produce bubbles, with little or no residue. |
| Sulfate scale | CaSO4 not less than 40% | Yellow-white or white | Insoluble in 5% hydrochloric acid, adds barium chloride to form a precipitate. |
Cleaning quality requirements and test methods
The standard specifies the specific indicators of corrosion rate, descaling rate and passivation film quality during chemical cleaning. The following is a comparison table of key quality requirements:
| Equipment Material | Corrosion Rate (g/(m²·h)) | Corrosion Amount (g/m²) | |
|---|---|---|---|
| Carbon Steel | ≤2（Laboratory） | 5（On-site measurement） | ≤80 |
| Stainless Steel | ≤1（Laboratory） | ≤1.5（On-site measurement） | ≤20 |
Implementation recommendations and precautions
To ensure the effective implementation of the standard, the following measures are recommended:
- Develop a detailed construction plan: Including cleaning agent ratios, process flow and quality control points.
- Strengthen personnel training: Ensure that operators are familiar with standard requirements and emergency treatment measures.
- Strict monitoring and recording: Real-time monitoring of key indicators such as corrosion rate and descaling rate and keep records.
- Environmental compliance: When handling cleaning waste liquid, it must comply with GB8978 and other local standards.
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