Gazovaya promyshlennost’Спецвыпуск № 1 2021

» Study of range boundaries of pressure regulators stable operation at various gas flow parameters

The pressure regulator is a central assembly element of gas reduction station. During the system operation the cases of pressure regulator unstable work can happens. One of their main reasons is the failure to fulfill a condition under which the gas-network gas consumption should fit in a specific range of its throughput with given gas flow parameters. According to technical and regulatory documentation analysis the acceptable range boundaries of stable regulators operation have different numerical values. Obviously, insufficient study of the system parameters influence on the transient processes range and course during the reduction has occured. Relevance of the present article is due to the necessity of studying and clarifying the stable operation range boundaries for different regulators at diverse gas flow parameters. At the stage of theoretical studies, the techniques for pressure regulators throughput determination were considered, mathematical relationships alowing to obtain the result with an acceptable value of relative calculation error in comparison with the technical passport characteristics were determined. The effect of temperature, gas density, input pressure magnitude on regulators throughput and range boundaries variation of stable operation was investigated. For carrying out experimental studies an operating gas control equipment was developed. According to obtained data the relations were derived and graphs were plotted. Comparative analysis of the results of theoretical and experimental studies has a relative error less than 10 %, that approves the correctness of obtained data. Thus, the research results clarify the range boundaries of pressure regulator stable operation recommended in the regulatory and technical documentation.

Keywords: PRESSURE REGULATOR, THROUGHPUT, GAS FLOW PARAMETERS, RANGE BOUNDARIES OF STABLE OPERATION.

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» Theoretical and experimental investigations of fiber-optic systems application for monitoring stress-strain state of gas pipeline elements

In this paper some aspects of modern fiber-optic systems application for monitoring stress-strain state of gas pipeline elements are discussed, which allow to increase safety of gas pipeline linear parts and areal facilities, located in the hard geological and climatic conditions. A method for calculating defoemation characteristics (strain component associated with tension (compression), bend plane position and bend radius value) in gas pipeline control cross-section is considered. It is shown that for the correct stress-strain state assessment of gas pipeline, not only directly measured strains and/or stresses at control points should be analysed, but also maximum deformations and/or stresses in control cross-section of gas pipeline should be calculated. The calculation technique for determination errors of deformation characteristics in the gas-pipeline control cross-section is considered to assess the operation correctness of stress-strain state control system under given strain-sensors errors and accuracy of sensors angular position obtaining in control cross-section. Some examples are given for calculating determination errors of deformation characteristics for several variants of angular coordinates of strain monitoring points at different values of the parameters characterizing bending and tension (compression) of gas pipeline. It was established that the determination errors for cross-sectional maximum longitudinal strains and mechanical stresses depend on the relative position of strain-sensor installation points. It was shown that the proposed errors estimation technique can be applied for justified determination of the most informative version of the control-points angular coordinates. The bench tests results for fiber-optic monitoring systems of the gas-pipeline stress-strain state are presented, during which an experimental accuracy estimation for longitudinal strain determination of test bench was carried out. Obtained results can be used both in design and operation of stress-strain state monitoring systems for gas pipeline elements.

Keywords: GAS PIPELINE, STRESS-STRAIN STATE, DEFORMATION MEASURING SYSTEM, NUMERICAL SIMULATION, BENCH TESTS.

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» Innovative activity and scientific achievements of Gazprom transgaz Kazan LLC

The article considers the new principles of innovative activity management implemented in Gazprom transgaz Kazan LLC since 2020. It also describes general organizational activities aimed to transform the employees’ thinking that brought the enterprise to the new progress level. The most important research and development planned for the next year are set out. They include the unified digital space for all gasification participants to interact, a mobile robotic platform for technical diagnosis of underwater transitions, non-contact technology for evaluating cathodic protection parameters of the equipment, proactive industrial safety management system. The paper presents some technologies and devices created and patented by Gazprom transgaz Kazan LLC employees and used in its own production. They are: detection methods for potentially hazardous areas based on transversal stress corrosion cracking, technology for gas evacuation from compressor yard equipment using a two-stage jet ejector, predictive analysis system for gas-pumping unit technical state based on energy efficiency parameters, pulsing combustion heat generator for gas distribution station, and automatic current distributor for cathodic protection. Also, the company’s innovative potential prospects are assessed.

Keywords: INNOVATIVE ACTIVITY, INVENTIVE ACTIVITY, STREAMLINING, RESEARCH AND DEVELOPMENT, TECHNICAL SOLUTION, IMPLEMENTATION, ECONOMIC EFFECT.

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» Efficiency evaluation under clasters formation for projects at prospecting and exploration stage

» Managing helium supply to Amur Gas Processing Plant based on computed membrane gas separation model for helium extraction plant at Chayandinskoye oil, gas, and condensate field

A membrane helium extraction plant was launched at Chayandinskoye oil, gas, and condensate field (Gazprom dobycha Noyabrsk LLC) in March 2020. The plant is a part of PJSC Gazprom’s complex for production, treatment, transportation, and processing of helium-containing natural gas, Power of Siberia. Amur Gas Processing Plant produces the required volumes of commercial helium. The gas exceeding market needs is extracted by the membrane extraction plant for long-term storage. The production feed is the gas separated at Chayandinskoye oil, gas, and condensate field. The feed gas capacity of membrane helium extraction plant is 32 billion m3/year. An optimization model is developed for the membrane helium extraction plant as a part of the Power of Siberia complex. The model aims to ensure an efficient operation planning for the complex as a consistent system under the changing feed compositions and volumes and the scheduled production of commercial helium and other Amur Gas Processing Plant products.

Keywords: POWER OF SIBERIA, HELIUM, MEMBRANE TECHNOLOGIES, MEMBRANE HELIUM EXTRACTION PLANT, GAS SEPARATION, MATHEMATICAL MODEL.

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» On the possibility of changing the hazard category of gas pipelines’ sections considering the variable properties of pipe steel elasticity

» A technique for determining and evaluating reflectors’ actual sizes by focal images using ultrasonic flaw detectors based on the acoustic tomography

Improving the gas transportation system’s reliability by improving the existing non-destructive testing methods is a priority for PJSC Gazprom. The developed technique is aimed to improve the quality of technical diagnosis of pipeline’s welded joints at the company’s facilities. Determining defects’ actual sizes and positions in welded joints is crucial to decide on further use, repair, or cutting out according to the current regulatory documents and specifications. The downsides of the existing methods are compensated by their combined use, which entails additional costs and effort. The proposed technique for detecting and evaluating reflectors’ actual sizes by focal images was developed by analyzing focal spots from various artificial reflectors. A prototype with artificial reflectors of various sizes, shapes, and orientations made from a pipe segment was used along with the reference company standards. The study resulted in highly accurate and reliable testing of welded joints and identified the possibility to detect all types of defects in a welded joint with high performance since there was no need for longitudinal-transverse movement of the transducer and associated cleaning insulation out of the inspected area.

Keywords: SENSITIVITY, TECHNICAL DIAGNOSIS, FOCAL SPOTS, ULTRASONIC TESTING, IDENTIFICATION.

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Gazovaya promyshlennost’ Спецвыпуск № 1 2021

Read in this issue:

Gas distribution and gas supply

New technologies and equipment

Organization of production and management

Gas and gas condensate processing

Repair and diagnostics of main pipelines, compressor plants and pumping stations