Table of Content

20 October 2018, Volume 54 Issue 5

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Development and Commentary

Discussion on the application of leakage detection technology for long distance pipeline

2018, 54(5):  0-0. 

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Engineering Design and Standards

Research on the Improvement of Design Standards for Fire-Fighting Systems and Safety Systems of Storage Tanks

2018, 54(5):  0-0. 

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Tanks fire and explosion accidents will cause serious economic losses, casualties and environmental pollution. It is of great significance to ensure the safety of petroleum strategic storage. With the increasing scale of China oil depot construction, the fire-fighting system and safety system of storage tank should adopt higher design standard grade requirement. In order to eliminate the tank accident and realize the essential safety of the storage tank, the key technical problems of the fire-fighting system and safety system of the storage tank were selected, that is, the supply intensity of fire water, the cooling of the storage tank, and the fire dike (separating dike), the power source of the fire pump, control valve position, accident drainage system and penetrant prevention. The paper introduced the advanced experiences and recommended practices of foreign standard, such as setting separating dike for a single storage tank with 1 × 104 m3 or more, fire dike can withstand the impact of oil leakage, the ready fire pump driven by diesel engine, the tank control valve installed outside the fire dike, design of independent storage tank rain water and oil sewage drainage system. Finally, the improvement suggestions of GB 50074-2014 were put forward, which are of guiding significance for improving the safety, reliability and emergency support ability of oil depots in China.

Deep Analysis on Selection of the Purging Rotameters Used in Coal Gasification Unit

2018, 54(5):  0-0. 

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Supported by actual project data, and combined with the relevant standards, the measuring range selection process of both gas phase and liquid phase purging rotameters which are used in coal gasification unit are analyzed and elaborated in depth in this paper. Also misunderstandings which are easy to fall in in design stage are clarified, and limitations of the relevant standards and specifications in the application are also discussed in this paper.

Factors affecting the Cv value of control valve and its application in data inter-extraction

2018, 54(5):  0-0. 

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The selection of the caliber of the control valve is very important. It directly affects the normal operation of the process production and the quality of the control. According to the ISA specification, this paper describes of selection principle of valve caliber and the calculation process of flow coefficient. Then the influencing factors of flow coefficient are obtained under different conditions. In the light of the calculation process, the notices of filling out the control valve datasheet (IPD) in the digital integrated design system are expounded. Finally, the calculation principle is verified by the example of the type selection of the control valve in the specific project.

Discussion of Combustible & Toxic Gas Detector and System Engineering and Application

Zhang QiFang

2018, 54(5):  0-0. 

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Combustible and Toxic gas detector is important part of safety guard of petrochemical plant. This article instructs the gas detector types and application area, and makes summary for typical gas range and alarm setpoint. At the same time, mixed gas detector assignment is discussed. Besides, gas detector system architectures are described as per latest law regulation and engineering experience, which is useful for engineering and application.

Process and Technology

FF fieldbus technology in the application of the acidic water stripping device

2018, 54(5):  0-0. 

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Fieldbus system adopts two-way digital communication between the field measurement and control equipments. The International Electrical Commission lays down a set of buses, the foundation fieldbus (FF) is the mainstream one. The communication distance of FF can reach 1900m without using field bus repeater. Fieldbus system can use bus power supply and support the intrinsically safe explosion-proof environment.This paper is based on the Foundation Fieldbus System Engineering Guide and analyses the technical characteristics, system configuration, network topology, network risk management of FF fieldbus. Combined with a project in the removal of hydrogen sulfide tower process, this paper makes a concrete analysis of the FF instrument selection and the equipment requirements, design the rational distribution network and calculate load. The paper provides reference for the field bus system engineering design. The research of FF control system engineering application can reduce the cost of control. At the same time, FCS can improve the level of automatic monitoring system and scatter control functions to the scene. This can provide a more effective monitoring and management capabilities.

A brief analysis of Protection and Control System of Primary Reformer ID Fan in Ammonia Plant

2018, 54(5):  0-0. 

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The primary reformer ID fan is very important in Ammonia Plant. The protection and control of ID fan is the key for smooth running of the whole plant. The control, interlock and protection of induced draft fan are discussed based on a revamping project of an Ammonia plant. The system structure, functionality and model selection of Machinery Protection System (MPS), Turbine Governor System, Over Speed Trip System are introduced. The functionality of ID fan related safety interlock in SIS, the relationship of different systems and signal connection between systems is discussed as well.

Research on the Application of Online Gasoline Blending Optimization Project Technology

2018, 54(5):  0-0. 

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This paper describes the advantage of online gasoline pipeline blending technology by analyzing the traditional gasoline tank blending and the modern online gasoline pipeline blending these two technologies. It also confirms the requirement of oil storage and transportation, automatic control instrument and control system through online gasoline pipeline blending technology research. The research focuses on the online analyzer system and the online blending optimization control system. The online analyzer system includes the near infrared analyzer, the total sulfur analyzer, sample pretreatment system, analyzer house, recovery system, etc. The online blending optimization control mainly includes the proportion control, optimal control, formula management, etc. By taking advantage of the online gasoline harmonic optimization techniques, implement Card edge control, make full use of the quality of the components of oil, ensure minimum excess of product quality, achieve the aid of maximizing the enterprise economic benefit.

Application of Electronic Marshalling System for Plant

2018, 54(5):  0-0. 

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This article takes the Emerson Delta V S series as an example to introduce the electronic marshalling technology, the technical features and hardware components of the system. Combining the application of electronic marshalling system in a practical project and the national/industry standards, it summarizes the practice of electronic marshalling system in explosion protection, power and grounding, and provides reference for the application of electronic marshalling system in other projects.

Information Technology

Information security analysis and Countermeasures of industrial control system in petrochemical enterprises

2018, 54(5):  0-0. 

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through the analysis of refining industrial control system network structure, points out the hierarchical network structure and Fenwick the necessity and advantages of a typical DCS control system, proposes a novel network security protection and reinforcement model and implements the actual operation of the system show that the model can realize the information security of industrial control system the network information security

Design and implementation of remote monitoring and control system for oil wells

Chang-Jing LIANG

2018, 54(5):  0-0. 

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Abstract: in order to realize the target of "unattended, all day monitoring, organization and maintenance, organization and maintenance, key inspection, safety and stability, level simplification" of oil and gas production ground system in oil and gas production, the overall design of oil well remote monitoring system is carried out, and the function design is carried out from two aspects of hardware and software. After field application, the opening time can be shortened from 2.1h to 10min, and the production of oil well is greatly improved. The time rate improves the work efficiency of personnel, and its framework and technology can be used as an important basis for Standardization Design of oil wells in the future.

Instrument and Meter

Development of High Precision Downhole Storage Electronic Pressure Gauge

2018, 54(5):  0-0. 

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This paper describes a new type downhole pressure gauge, the pressure gauge from the downhole tool and surface processing software is composed of two parts; a downhole instrument using PIC18F2480 MCU and AD7794 A/D sampler that can realize the system operation with very low power consumption, can be very good to prolong the service life of the battery; read the stored data through the instrument ground processing software, to achieve playback, display, analysis and other functions. At the same time, the temperature sensor external can be very good to reduce the temperature measurement delay. After testing, the pressure gauge can reach less than 0.05% under various pressure and temperature conditions, which can meet the requirements of downhole testing.

The Calculation Method of Control Valve Sizing

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Flow Coefficient is an important factor for measuring control valve capacity. It is also a principle basis for selecting nominal diameter of control valve. In order to meet the design requirement of control valve selection, a design method of control valve selection is proposed with the latest standard ISA algorithm in this paper. It utilizes visual C# to develop a computer-aided calculation software for control valve calculation. The relevant process parameters can be automatically imported and calculated. It has been proved that the method is accurate, simple and feasible, which could be helpful for the improvement of design quality and work efficiency.

Comparison of Electromagnetic Acoustic Transducer（EMAT） and Magnetic Flux Leakage（MFL） in Pipelines Internal Inspection Technology

2018, 54(5):  0-0. 

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Pipeline internal inspection is the main means to find the pipeline body defect, and it is also an important link of pipeline integrity management.In this paper, the principle and applicability of MFL and EMAT are introduced in detail. The analysis results of the test data and the results of excavation verificationin in a product pipeline show that the quantitative measurement error of MFL is large and it is difficult to detect crack defects, then EMAT can detect the external defects of the pipeline and the peel of the anti-corrosion layer, especially the crack detection accuracy is high.

Innovation and Practice

Measurement and Application Analysis of Gas Chromatogragh in High Carbon Dioxide Natural Gas Components

2018, 54(5):  0-0. 

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The basic application situation of the offshore platform portable laboratory gas chromatogragh is introduced. When using the laboratory gas chromatogragh to analyze the natural gas components with high carbon dioxide content, there are two componets which are unable to be analyzed methane and carbon dioxide. This problem is analyzed, and the corresponding treatment methods are adopted.

Application of gamma ray level indicator in gas-phase polypropylene process

2018, 54(5):  0-0. 

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introduced the measurement principle and application of gamma ray level indicator in the gas-phase polyolefin process with a horizontal stirred reactor. The influencing factors of inaccurate measurement are analyzed, in the actual operation, the parameters such as power of the stirrer, reaction temperature and pressure, density of gas phase are used to an assisting method of controlling the reaction level. At the last, adjustment the formula of level indicator and changing the position of the nuclear source are the optimizing methods for the level indicator.

Application analysis of oil tank level switch

2018, 54(5):  0-0. 

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In order to ensure the safety of the oil tank, the tanks in large oil reserve bases must be installed high-high level switches and low-low level switches, these switches need to be independent of the continuous level gauge. This paper describes the types, principle and characteristics of liquid level switch used in the tank. Then analyses the advantages and disadvantages of the tuning fork switch, limit travel switch and outside attached ultrasonic liquid level switch. Finally, the paper provides suggestions for the selection of liquid level switch.