Boutique Glass Lined Mixer

Glass lined mixer are commonly used in industries such as chemical and pharmaceutical due to their combination of the corrosion resistance of glass and the mechanical strength of metal. However, there are potential risks associated with their use. I will conduct a comprehensive risk assessment from the perspectives of mechanical, chemical, and operational factors, taking into account the potential hazards that may arise.

1. Equipment Overview

The boutique glass lined mixer is made by coating high silicon content porcelain glaze on the surface of a metal substrate (such as carbon steel, stainless steel), and then burning it at high temperature to make the porcelain glaze adhere tightly to the metal surface. It not only has the chemical stability of glass, which can effectively resist the erosion of various corrosive media, but also has the strength and toughness of metals, and is widely used in the stirring process of reaction vessels in industries such as chemical, pharmaceutical, and food. However, during its operation, there are multiple potential risks that require a comprehensive assessment.

2. Risk identification and assessment

（1） Mechanical risk
1. The mixing shaft is broken
Risk factors: Long term overload operation, the torque carried by the boutique glass lined mixer exceeds the design limit; The material of the mixing shaft does not meet the requirements or there are internal defects; The installation of the shaft and coupling is not concentric, resulting in abnormal stress during operation.
Hazard level: The breakage of the mixing shaft can cause the mixing to stop, affect the reaction process, result in uneven mixing of materials, and may cause local reactions, temperature control, and even material leakage. If the material is corrosive, toxic, or flammable and explosive, it will pose a serious threat to personnel safety and the environment.
Risk level: High
2. Abnormal vibration of the mixer
Risk factor: Unbalanced installation of agitator impeller; Severe bearing wear; Uneven distribution of materials inside the reaction vessel; The foundation is not firmly fixed.
Hazard level: Abnormal vibration can accelerate the damage of various components of the glass lined mixer, shorten the service life of the equipment, and may also cause loose connection parts, leading to material leakage. The noise generated by vibration can also cause hearing damage to operators.
Risk level: Medium
（2） Risk of damage to enamel glass layer
1. Mechanical impact damage
Risk factors: The impact of materials on the enamel layer when the mixer is started or stopped; Friction and collision between solid materials and enamel glass layer during the stirring process; Unexpected impact of tools on the enamel layer during maintenance.
Hazard level: After the glass lining layer is damaged, the metal substrate is exposed and loses its corrosion resistance protection. It will be quickly corroded by the material, leading to leakage of the reaction kettle, contamination of the material, and even causing safety accidents.
Risk level: High
2. Thermal stress damage
Risk factors: Rapid temperature changes inside the reaction vessel, such as rapid heating or cooling, can cause significant differences in thermal expansion coefficients between the enamel layer and the metal substrate, resulting in thermal stress; The equipment was not preheated or cooled according to the operating procedures.
Hazard level: Thermal stress can cause cracks in the enamel layer, which will propagate over time and ultimately lead to the peeling of the enamel layer and equipment failure.
Risk level: Medium
（3） Chemical risk
1. Material corrosion
Risk factors: The materials being processed are highly corrosive, such as concentrated sulfuric acid, concentrated nitric acid, etc. Although the enamel layer has some corrosion resistance, it may still be slowly eroded by long-term contact; The material contains impurities that accelerate the corrosion of the enamel layer.
Hazard level: Material corrosion will gradually damage the enamel layer, exposing the metal substrate and causing leakage, resulting in material loss and environmental pollution. If the material is toxic and harmful, it will also endanger the health of operators.
Risk level: High
2. Chemical reaction goes out of control
Risk factors: Uneven mixing leads to excessive local concentration of materials, causing violent chemical reactions; The malfunction of the glass lined mixer caused it to stop running, resulting in the inability to dissipate reaction heat in a timely manner, leading to temperature loss of control and causing accidents such as explosions and fires.
Hazard level: Uncontrolled chemical reactions can cause serious casualties, equipment damage, and environmental pollution, with extremely serious consequences.

Risk level: extremely high

3. Risk control measures

（1） Mechanical risk control
1. Strictly control operating parameters: Install torque monitoring devices to monitor the torque of the mixing shaft in real time and avoid overloading operation; Regularly check the concentricity of the mixing shaft to ensure correct installation.
2. Strengthen equipment maintenance: Regularly check the wear of bearings, impellers, and other components, and replace severely worn parts in a timely manner; Ensure that the foundation of the boutique glass lined mixer is firmly fixed and reduce vibration.
（2） Risk control of damage to enamel glass layer
1. Avoid mechanical impact: When starting and stopping the enamel mixer, slowly adjust the material flow rate to reduce the impact on the enamel layer; When adding solid materials, use appropriate feeding methods to prevent the materials from directly hitting the enamel layer; During maintenance, use specialized tools to avoid damage to the enamel layer.
2. Control temperature changes: Strictly follow the operating procedures for equipment preheating and cooling, control the rate of temperature changes inside the reaction vessel, and avoid rapid heating or cooling; Install temperature monitoring devices to monitor temperature changes in real-time.
（3） Chemical risk control
1. Choose appropriate equipment: Based on the corrosiveness of the material, select a enamel stirrer with corrosion resistance matching, and if necessary, use a special formula of porcelain glaze; Strict analysis and testing of materials to ensure the absence of corrosive impurities.
2. Monitoring the reaction process: Install temperature, pressure, concentration and other monitoring devices to monitor the reaction process parameters in real time; Set up an alarm system to promptly alert when parameters are abnormal and take corresponding measures to prevent chemical reactions from getting out of control.
（4） Operational risk control
1. Strengthen personnel training: Provide professional training to operators to familiarize them with equipment operating procedures and process requirements, and ensure that they pass the assessment before taking up their posts; Regularly organize safety knowledge and skill training for operators to improve their safety awareness and operational level.
2. Standardized maintenance: Establish a comprehensive equipment maintenance system, clarify maintenance cycles and contents; Arrange professional personnel for equipment maintenance and upkeep to ensure the quality of maintenance and upkeep; Establish equipment maintenance records and document the maintenance status.
The above is the risk assessment and control measures for the glass lined mixer. If you want to further refine the control plan for a certain type of risk or have other supplementary needs, please feel free to let us know at any time.