Author: Huang Guangming Unit: Changsha Engineering of China Light Industry***
Summary:As an indispensable part of the chemical industry, the safety and stability of the operation of chemical tank farms are crucial to the healthy development of the entire industry. As an important instrument for tank farm management, the selection and design specifications of automation instruments are directly related to the safety and operation efficiency of tank farms. This article first summarizes the importance and basic characteristics of chemical tank farm automation instruments, and then details the selection principles and technical specifications of liquid level instruments, including measurement principles, measurement methods, etc. At the same time, the article also involves the design and selection of the switch valve in the tank farm, as well as the design and installation of cable laying. Through in-depth research and the content of these aspects, it aims to provide useful reference for the practice in related fields, and promote the improvement of the management level of chemical tank farms and the healthy development of the industry.
Keywords::Chemical industry; tank farms; Automatic level instrumentation; selection and engineering design; Security; Operational efficiency.
Foreword
The chemical tank farm is a key facility used for the storage and transfer of chemicals in the chemical industry, and its safe and stable operation is of great significance to ensure the safety of chemicals and maintain the stability of the industry. As an important tool for tank farm management, the automatic liquid level instrument can monitor the liquid level height in the tank in real time, provide accurate data support for managers, and ensure the safe operation of the tank farm. Therefore, it is of great practical significance and theoretical value to conduct in-depth research on the selection and engineering design of automatic liquid level instruments.
Overview of automated level gauges
The liquid level instrument is one of the most important monitoring instruments in the chemical tank area, which has the characteristics of wide measurement range and high accuracy. Level gauges play a crucial role in storage tanks with complex chemical media. Compared with the instruments commonly used in ordinary devices, there are differences in the measurement principle and measurement method of liquid level instruments, so their selection and design need to fully consider their particularity. The development and application of automatic liquid level instruments not only improve the accuracy and reliability of liquid level measurement, but also provide strong support for the automatic management of tank farms.
Selection principles and technical specifications of liquid level instruments
When selecting a liquid level instrument, it is necessary to follow certain principles and technical specifications. First of all, the appropriate measuring principle and measurement method should be selected according to the actual needs of the tank farm and the requirements of safety specifications. Common measurement principles include buoyancy, pressure, radar, etc., each of which has its scope of application and advantages and disadvantages. Therefore, it is necessary to consider the structure of the tank, the characteristics of the medium, and the measurement requirements when selecting the tank.
Secondly, it is necessary to consider the accuracy, stability, reliability and other performance indicators of the instrument. Accuracy refers to the degree of deviation between the measured results and the true value, stability refers to the change in the performance of the instrument during long-term operation, and reliability refers to the ability of the instrument to maintain normal operation in harsh environments. These performance indicators directly affect the measurement accuracy and service life of the level instrument, so it needs to be paid enough attention when selecting the model.
In addition, it is also necessary to consider factors such as the installation method of the instrument, the use environment, etc. The installation position of the liquid level instrument should be easy to observe and maintain, and the influence of environmental factors such as temperature, pressure, and humidity on the performance of the instrument should also be considered. For example, in cold areas, you need to choose a meter with freeze protection, and in a humid environment, you need to choose a meter with moisture protection.
4.ControlValve design and selection
Tank farm control valve is an important part of realizing the automatic storage and transfer of tank farm. In the design and selection of control valves, it is necessary to fully consider the safety code requirements of the tank farm, power source conditions and other factors. The type, specification and material of the valve will affect its sealing performance, service life and safety performance. Therefore, it is necessary to consider comprehensively according to the actual situation of the tank farm when selecting the model.
First of all, it is necessary to select the appropriate valve type according to the medium characteristics of the tank farm. For example, for flammable and explosive media, it is necessary to choose a valve with explosion-proof function; For corrosive media, it is necessary to choose corrosion-resistant materials. Second, the size and size of the valve need to be considered to ensure that it can meet the flow and pressure requirements of the tank farm. In addition, factors such as the operation mode and maintenance of the valve need to be considered to ensure that it can operate stably for a long time.
Design and installation of cable laying
Cable laying is an important guarantee for the normal operation of liquid level instruments and switch valves. In the design and installation of cable laying, it is necessary to fully consider the length, diameter, material and other factors of the cable, as well as the selection of the laying path and the fixing method. Reasonable cable laying can not only improve the stability and reliability of the system, but also reduce the failure rate and maintenance costs.
First of all, it is necessary to choose the appropriate cable type and specification according to the distribution of instruments and valves, as well as the actual situation of the tank farm. For example, in high-temperature environments, it is necessary to choose high-temperature resistant cables; In a humid environment, you need to choose a cable that is moisture and waterproof. Secondly, it is necessary to consider the laying path and fixing method of the cable to avoid mechanical damage or external interference of the cable. In addition, attention needs to be paid to the protection and grounding measures of the cable to ensure that it can operate safely and reliably.
Conclusions and prospects
The selection and engineering design of automatic liquid level instruments for chemical tank farms is the key to ensure the safe and stable operation of tank farms. Through in-depth research on the selection principles, technical specifications and requirements of liquid level instruments, as well as the design and installation of control valves and cable laying, it can provide useful reference for practice in related fields. At the same time, it can also promote the improvement of the management level of chemical tank farms and the healthy development of the industry.
Looking forward to the future, with the continuous progress of science and technology and the continuous expansion of application fields, automatic liquid level instruments will be more intelligent, accurate and reliable. In the future, we can further pay attention to the application and development trend of intelligent technology and remote monitoring technology of liquid level instruments, in order to provide more comprehensive and efficient technical support for the safety management of chemical tank farms.