Shut-off System Research Articles

Analisis Konsistensi Volume Output Pada Nozzle Barrel Mesin Mini Injeksi V-Line Menggunakan Material Plastik Polypropylene ExxonMobil AP03B

One of the processes commonly used in making plastic goods is the injection molding process. Every process in injection molding has a very important role. A less-than-perfect process will result in defects or failure in the product. To reduce product defects, one of the processes that must be researched is the barrel purging process. The purging volume on the mini injection machine using the V-line method is inconsistent, as evidenced by the fact that if the purging waste, or what is usually called an avalanche is weighed, it will produce a non-uniform mass. This research uses a mini injection machine with the V-line method which has 2 main steps to carry out the plastic injection process; dosing and injecting. Unlike injection engines in general, this engine does not have a check-ring to withstand back pressure. This machine uses a shut-off system as a replacement for the check-ring role. This machine has never been subjected to a purging volume consistency testing process. The consistency of the purging volume greatly influences the product uniformity results. The research method used in this final assignment is direct. Data collection and test specimen collection will be taken directly on the mini injection machine using the V-line method. The steps taken in this research are planning, taking data, taking test specimens, processing test specimen data, and comparing test specimen data to obtain analysis results. The research results show that the mini V-line injection machine cannot support mass production, because increasing the screw rotation speed will affect the consistency of the volume of plastic that will be produced in the barrel, causing production to not run quickly and precisely.

An Exploration of Safety Measures in Hydrogen Refueling Stations: Delving into Hydrogen Equipment and Technical Performance

The present paper offers a thorough examination of the safety measures enforced at hydrogen filling stations, emphasizing their crucial significance in the wider endeavor to advocate for hydrogen as a sustainable and reliable substitute for conventional fuels. The analysis reveals a wide range of crucial safety aspects in hydrogen refueling stations, including regulated hydrogen dispensing, leak detection, accurate hydrogen flow measurement, emergency shutdown systems, fire-suppression mechanisms, hydrogen distribution and pressure management, and appropriate hydrogen storage and cooling for secure refueling operations. The paper therefore explores several aspects, including the sophisticated architecture of hydrogen dispensers, reliable leak-detection systems, emergency shut-off mechanisms, and the implementation of fire-suppression tactics. Furthermore, it emphasizes that the safety and effectiveness of hydrogen filling stations are closely connected to the accuracy in the creation and upkeep of hydrogen dispensers. It highlights the need for materials and systems that can endure severe circumstances of elevated pressure and temperature while maintaining safety. The use of sophisticated leak-detection technology is crucial for rapidly detecting and reducing possible threats, therefore improving the overall safety of these facilities. Moreover, the research elucidates the complexities of emergency shut-off systems and fire-suppression tactics. These components are crucial not just for promptly managing hazards, but also for maintaining the station’s structural soundness in unanticipated circumstances. In addition, the study provides observations about recent technical progress in the industry. These advances effectively tackle current safety obstacles and provide the foundation for future breakthroughs in hydrogen fueling infrastructure. The integration of cutting-edge technology and materials, together with the development of upgraded safety measures, suggests a positive trajectory towards improved efficiency, dependability, and safety in hydrogen refueling stations.

Gelation of an Organically Crosslinked PHPA Polymer Gel System: An Experimental Study

Excessive water production in the oil field is the major difficulty in production for the petroleum industry. Remedial techniques need to be applied to control this excess water production considering the health, safety, and environmental issues and improve the reservoir's economic and productive life. In this study polymer gel system comprising the polymer partially hydrolyzed polyacrylamide (PHPA) and organic cross-linkers (Hydroquinone and Hexamethylene tetramine) were prepared as a water shut-off system to control the excessive production of water in the oil field. The effect of various parameters such as temperature, pH, cross-linker concentration, degree of hydrolysis, and divalent cations on gelation time was investigated using the bottle testing method. The importance of retarders at high temperatures was also evaluated. The gelation temperature was varied from 90 °C to 120 °C to study the effect of different parameters on the gelation time and gel behavior. This study suggests that Partially Hydrolyzed Polyacrylamide (PHPA) with organic cross-linkers can be an effective polymer gel system for water shut-off operations, and with the addition of retarders at high temperature to control gelation time, the performance of the gel can be improved.

Development and evaluation of an automated solvent-assisted flavour evaporation (aSAFE)

Artefact-avoiding isolation of the volatiles from foods is a crucial step before analysis of odour-active compounds by gas chromatography (GC). In the past 20 years, solvent extraction followed by solvent-assisted flavour evaporation (SAFE) has become the standard approach, particularly prior to GC–olfactometry. The manual valve of the SAFE equipment, however, leads to suboptimal yields and the risk of a contamination of the volatile isolate with non-volatiles. We thus developed an automated SAFE (aSAFE) approach by replacing the manual valve with an electronically controlled pneumatic valve. The aSAFE provides clearly higher yields than the manual SAFE (mSAFE), notably from extracts high in lipids and for odorants with comparably high boiling points. Additionally, aSAFE substantially reduces the risk of non-volatiles being transferred to the volatile isolate. Full automatisation is possible by combining the aSAFE approach with an automated liquid nitrogen refill system as well as an endpoint recognition and shut-off system.

Performance Evaluation of Polymer Gel Composite Resin Coated Sand Water Shutoff System

Aiming at the problems of low plugging strength and short plugging time of Polymer gel in fractured ultra-low permeability reservoirs, a composite plugging process of Polymer gel and resin coated sand is proposed. This paper evaluates the rheological properties of Polymer gel and the consolidation performance of resin coated sand through laboratory tests. Furthermore, the sand-packed tube was used to compare and evaluate the water blocking ability of Polymer gel and resin coated sand alone and the combined water blocking ability of the two. The results show that the initial viscosity of Polymer gel is very low (20-30cp), the strength after gelation is high (>40000cp), it has certain temperature and salt resistance, and it can still maintain high gel strength after shearing. However, after long-term water flooding, its plugging strength gradually decreases, and its plugging validity period is shorter. The selected resin coated sand has better consolidation effect at reservoir temperature and good plugging ability. After combining the polymer gel with the selected resin coated sand, the plugging strength and validity period of the system have been greatly improved. The research results in this paper can provide new exploration ideas for chemical water shutoff in fractured ultra-low permeability reservoirs.

Selective Water Plugging Technology for Horizontal Well with Screen Completion

The SD107 gel system developed has good oil–water phase selective gelation and oil–water phase selective blocking properties. The static gel-forming experiment results showed that the gel water shutoff system formulated with oilfield reinjection water (oil content < 0.05%) has a viscosity of 200 mPa·s after gelation, and the gel water plugging system formulated with oilfield produced fluid (oil content ≥ 20.0%) had a viscosity of 26 mPa·s after gelation. Results of the core physical simulation experiment indicated that the enhanced recovery rate was the highest (34.6%) when the resistance ratio of the high-low permeability core was about 10.0 after plugging. As per the fluid volume (Q) of the oil well to be blocked, the maximum production pressure difference (∆P) was predicted, and on the basis of economic output, the resistance of the oil section, the resistance of the high water cut section, and the resistance of the water outlet section after plugging was used to calculate the plugging depth (re1, the limit water plugging radius), which offers a basis for the design of water plugging process parameters for horizontal wells. The field water plugging test results showed that after using this water plugging technology, the daily oil production increased from about 4 t/d to 20 t/d, the daily oil increase was 16 t/d, and the water cut decreased from 75% to about 25%. The water-blocking construction was a success.

A tunable, rapid, and precise drug control of protein expression by combining transcriptional and post-translational regulation systems

Rapid, precise, and tunable regulation of protein abundance would be significantly useful in a variety of biotechnologies and biomedical applications. Here, we describe a system that allows tunable and rapid drug control of gene expression for either gene activation or inactivation in mammalian cells. We construct the system by coupling Tet-on 3G and small molecule-assisted shutoff systems, which can respectively induce transcriptional activation and protein degradation in the presence of corresponding small molecules. This dual-input drug inducer regulation system facilitates a bidirectional control of gene expression. The gene of interest can be precisely controlled by dual small molecules in a broad dynamic range of expression from overexpression to complete silence, allowing gene function study in a comprehensive expression profile. Our results reveal that the bidirectional control system enables sensitive dosage- and time-dependent regulation for either turn-on or shutoff of gene expression. We also apply this system for inducible genome editing and gene activation mediated by clustered regularly interspaced short palindromic repeats. The system provides an integrated platform for studying multiple biological processes by manipulating gene expression in a more flexible way.

Estimation of fuel efficiency of automobile and tractor diesel engines, operating with the shutdown of part of the cylinders

The analysis of previously performed studies to determine the fuel efficiency of automobile and tractor engines when a part of the cylinders is disconnected is carried out. This is done by stopping the fuel supply to them with simultaneous disconnection of the gas distribution mechanism for the same cylinders or without affecting the gas distribution organs in partial operating modes. It is shown that if the cylinder shut-off system for engines with forced ignition is used in serial engines, then additional research is required for diesels, since the results of experimental studies given in the literature are contradictory. The previously proposed methods are based on the use of experimental characteristics, empirical dependencies, and other experimental data that are valid only for specific diesels and their operating modes. In addition, the assessment of fuel efficiency is mainly performed by calculation without experimental confirmation. Therefore, the results of computational studies presented in some papers differ qualitatively from the results of experimental studies presented in other papers. A method based on generalized experimental data is proposed that allows the load characteristics of a full-size diesel engine to calculate its indicator and effective indicators when the fuel supply to some cylinders is stopped. The results of experimental and computational studies of changes in the fuel efficiency of a 4CH10,5/12 diesel engine in partial modes when a part of the cylinders is switched off are presented. At the same time, several options are considered - by stopping the fuel supply and closing the intake and exhaust valves, as well as without any impact on the organs of the gas distribution mechanism. It is shown that the improvement of the fuel economy of the 4CH10,5/12 diesel engine when a part of the cylinders is disconnected with the intake and exhaust valves closed is due to the absence of pump losses in the disconnected cylinders.

МЕТОДИКА РАСЧЕТА ВЕЛИЧИНЫ КРУТЯЩЕГО МОМЕНТА НАСТРОЙКИ ЭЛЕКТРОПРИВОДА В СИСТЕМЕ ЭЛЕКТРОПРИВОДНОЙ ЗАПОРНОЙ АРМАТУРЫ С ПРЯМОЛИНЕЙНЫМ ПЕРЕМЕЩЕНИЕМ ЗАПОРНОГО ОРГАНА

Представлена новая методика расчета величины крутящего момента настройки электропривода в системах электроприводной запорной арматуры как основных элементов, обеспечивающих безопасность нефтяных трубопроводов и магистральных газопроводов. Методика позволяет при минимальном объеме входной информации о характеристиках элементов системы (электропривода, запорной арматуры, системы управления) произвести расчет достаточного значения крутящего момента настройки электропривода и гарантировать соответствие фактического крутящего момента при полной остановке системы расчетному крутящему моменту, установленному статическими методами. Уточнение параметров настройки проводится путем экспериментального определения протечек среды при пошаговом снижении крутящего момента в пределах регулирования электропривода. Использование методики на стадии проектирования позволяет при эксплуатации систем снизить нежелательные нагрузки, возникающие в запорной арматуре со стороны электропривода, обеспечивая надежную работу трубопроводных систем, транспортирующих минеральное сырье.

Mix-up led to chlorine release at Kansas distillery

The U.S. Chemical Safety Board is recommending changes to chemical transfer procedures and better transfer equipment, including automated and remote shutoff systems, following an accident that released chlorine and sent 140 people to medical centers in Atchison, Kan. The accident occurred in October 2016 when workers inadvertently unloaded sulfuric acid from a tanker truck into a fixed tank of sodium hypochlorite at a distillery owned by liquor and wheat products supplier MGP, CSB says in a report and video. Fill pipelines for the sulfuric acid and sodium hypochlorite tanks looked identical, were only 0.5 meters apart, and were not clearly marked, CSB notes. As a result, 15,141 L of sulfuric acid entered the hypochlorite tank, releasing a toxic cloud of chlorine and other chemicals. CSB says industry figures show similar unloading operations can involve large quantities of chemicals with serious consequences—every 8.4 seconds, 36.2 million metric tons of chemical products

Development of a promoter shutoff system in Aspergillus oryzae using a sorbitol-sensitive promoter.

Promoter shutoff is a general method for analyzing essential genes, but in the fungus Aspergillus oryzae, no tightly repressed promoters have been reported. To overcome the current limitations of conditional promoters, we examined sorbitol- and galactose-responsive genes using microarrays to identify regulatable genes with only minor physiological and genetic effects. We identified two sorbitol-induced genes (designated as sorA and sorB), cloned their promoters, and built a regulated egfp and brlA expression system. Growth medium-dependent enhanced green fluorescence protein (EGFP) fluorescence and conidiation were confirmed for egfp and brlA under the control of their respective promoters. We also used this shutoff system to regulate the essential rhoA, which demonstrated the expected growth inhibition under repressed growth conditions. Our new sorbitol promoter shutoff system developed can serve as a valuable new tool for essential gene analyses of filamentous fungi.

초고압 용적형 펌프의 체절운전시스템 개발에 관한 연구

초고압 용적형 펌프는 로터의 회전에 의한 주기적인 용적의 변화를 이용하는 펌프로 고압, 고유량을 동시에 만족하며 로터의 저속 및 고속 회전에 따라 변화 없이 일정하게 상대적으로 높은 펌프 효율을 유지할 수 있는 장점을 가진다. 많이 사용되고 있는 원심펌프와는 달리 별도의 진공펌프가 없이도 자흡 성능을 가지고 있으며, 비교적 단순한 구조로 인하여 경량화, 소형화가 가능한 특성을 자기고 있다. 유체를 높은 압력으로 이송할 수 있으며, 압력의 변동에 따라 유량의 변동이 적은 정량 토출이 가능하다. 이러한 용적형 펌프를 사용하는 이유는 흡입된 유체가 유량의 변화 없이 토출되는 장점이 있기 때문이다. 본 연구에서는 유량의 변화가 없다는 장점이 있는 용적형 펌프의 체절시스템을 개발하여 펌프의 고압 운전시의 안전성을 확보하고자 하였다. 체절시스템은 컨트롤러 프로그램, 전자클러치, 릴리프밸브의 3가지로 이루어져, 한 가지 시스템이 작동하지 않아도 다른 시스템이 작동하는 시스템으로 이루어져 있다. 컨트롤러 프로그램과 전자 클러치의 작동을 확인하기 위한 과속도 시험과 릴리프 밸브의 유체유동해석, venting 실험을 통해 현재 개발한 초고압 용적형 펌프의 체절시스템이 작동됨을 확인하였다. Ultra-high pressure positive displacement pump can discharge high pressure water with mass volume, which depends on periodic changes in volume that made by rotation motor. Its high efficiency of discharge is one of the most strong point of positive displacement pump. Due to its simple system structure, it can be miniaturized and lightened. Positive displacement pump can discharge high pressure with stable flow rate, irrespective of pressure fluctuate. This is the reason that positive displacement pump was used instead of centrifugal pump. In this study, shutoff operating system was developed for positive displacement pump to secure safety of high pressure operate. This shutoff system contains controller system, electronic clutch, and relief valve, and each part is mutual supplementation. Speed test was carried out in order to check operation of controller program and electronic clutch and fluid flow, venting experiment of the relief valve. It was confirmed that segment system of ultra-high pressure positive displacement pump is operated.

Modelling Gelation Time of Organically Cross-linked Water-shutoff Systems for Oil Wells

Water production is one of the major challenges in the petroleum industry, especially brown fields and water drive reservoirs. Water production can weaken the cementation of sand grains, thereby rendering formations partially or completely unconsolidated. This in turn initiates fines migration and aggravates safety concerns. The gelation time is an important characteristic of water-shutoff systems and it is influenced by different parameters. The gelation time gives an indication of the time required for a gel to transit from free flowing fluid to solid or semi-solid gel making it difficult to pump. Organically cross-linked gels have numerous applications in the industry such as shutoff systems. They are used to control water and gas production in oil wells. The effect of cross-linker concentration, temperature and brine concentration on the gelation time of an organically crosslinked system was studied. Based on the experimental results a mathematical model was developed for predicting the gelation time of the water-shutoff system. The results showed that temperature had the highest impact on the gelation time of the water-shutoff system with an effect estimate of (-2.292). The brine concentration of the mix water recorded the lowest impact with an effect estimate of 0.2083 and the interaction between cross-linker concentration and brine concentration of mix water had neutral impact. A predictable and effective water-shutoff system has been developed with an excellent initial viscosity which can easily be pumped and applied to solve water production and its associated problems. The gelation time of organically crosslinked water-shutoff system can be optimised in water control operations using this model and the effect estimates of these parameters.

Fast protein-depletion system utilizing tetracycline repressible promoter and N-end rule in yeast.

A protein depletion by promoter shutoff or protein destabilization is an important tool in investigation of functions of essential genes. Various approaches using different repressible promoters, inducible degrons, or their combinations were developed. While successful, the current techniques have a drawback in that they require fusion of a large degradation tag to the target protein and/or a change in growth conditions to repress the promoter. We describe efficient protein depletion using the combination of a metabolically inert tetracycline repressible promoter with tetracycline aptamer and constitutive target protein destabilization by means of ubiquitin fusion. The target protein does not require a tag, and its elimination is several fold faster compared with standard promoter shutoff systems. A depletion time of <40 min was sufficient to achieve a robust phenotype.

Definition of time operation of the valve shutoff system of gasified premises explosion safety

The results of experimental tests of springs of shutoff valve GSV-1, operating based on a signal, set by the gas protection system to the shutoff solenoid at an abrupt pressure increase in the inlet gas pipeline are presented in the paper. Operation time of the mechanical part of shutoff valves at the pressure increase in the pipeline up to 50.6 kPa (0.5 atm.) ranges from 1,11 to 1,43 s. Operation time at the signal setting from the gas protection system to the shutoff solenoid - from 1,04 to 1,22 s. Statistical distribution functions of shutoff valves operating time do not contradict the Weibull distribution in terms of the Mann-Whitney U test that will allow to calculate the optimal time intervals of the valve operation. Reasonable reliability parameters of the proposed solenoid shutoff valve and its diagnostics terms will ensure explosion protection of gasified premises and the desired safety level for people in them

Inpatient Studies of a Kalman-Filter-Based Predictive Pump Shutoff Algorithm

An insulin pump shutoff system can prevent nocturnal hypoglycemia and is a first step on the pathway toward a closed-loop artificial pancreas. In previous pump shutoff studies using a voting algorithm and a 1 min continuous glucose monitor (CGM), 80% of induced hypoglycemic events were prevented. The pump shutoff algorithm used in previous studies was revised to a single Kalman filter to reduce complexity, incorporate CGMs with different sample times, handle sensor signal dropouts, and enforce safety constraints on the allowable pump shutoff time. Retrospective testing of the new algorithm on previous clinical data sets indicated that, for the four cases where the previous algorithm failed (minimum reference glucose less than 60 mg/dl), the mean suspension start time was 30 min earlier than the previous algorithm. Inpatient studies of the new algorithm have been conducted on 16 subjects. The algorithm prevented hypoglycemia in 73% of subjects. Suspension-induced hyperglycemia is not assessed, because this study forced excessive basal insulin infusion rates. The new algorithm functioned well and is flexible enough to handle variable sensor sample times and sensor dropouts. It also provides a framework for handling sensor signal attenuations, which can be challenging, particularly when they occur overnight.

热固性自膨胀堵调体系的物理模拟实验研究与应用

相关研究人员通过岩心流动物理模拟实验的方法，采用岩心驱替模型，通过监测实验过程中压力变化，来评价堵调体系在岩心中成胶后的封堵压差及水相封堵率，为现场应用提供参考。通过实验发现：当其它条件一定时，糠醇含量越高，封堵压差越大；成胶温度越高，封堵压差越小；堵前水相渗透率越大，固结后封堵压差越小。当其它条件一定时，封堵压差与岩心管的长度基本上是呈线性关系的，且岩心管越长，封堵压差越大。优化后的堵调体系在较低的浓度下，当处于高温时仍有很好的封堵强度，对不同渗透率的岩心均有良好封堵适应能力，其封堵率均在99.0%以上。在现场进行先导试验之后，堵调体系也取得了良好的降水增油效果。 Through the core flow experiment, the core displacement model was applied to monitor the pressure changes in the process of experiments to evaluate the block pressure difference and water plugging rate after the water shutoff system gel in cores, thus, it can provide a reference for field application. Found by experiment: the higher furfuryl alcohol content, the greater the block pressure difference; the higher the gelling temperature, the smaller the block pressure difference; the greater the aqueous phase permeability before the block of stratum, the smaller the block pressure difference after consolidation. When other conditions remain the same level, the block pressure difference and the length of the core tube is basically a linear relationship. The water shutoff system optimized in the lower concentration still has good sealing strength when exposed to high temperatures. As to the core of different permeability, it still has a good blocking ability and its blocking rate is 99.0% or higher.

Gelation studies of an organically cross-linked polyacrylamide water shut-off gel system at different temperatures and pH

The use of gel as the water shut-off agent has been widely reported in enhanced oil recovery (EOR) of mature oil fields. The organically cross-linked polymer systems are preferred due to their greater thermal stability and suitability over wide pH range. Polymer gels are used successfully in many reservoirs all over the world, but it is difficult to find a suitable economical polymer for the harsh reservoir conditions of high temperatures and salinity. Some polymer gels are carcinogenic in nature whereas some are non-ecofriendly. In recent times cross-linkers such as chromium (III) acetate and phenol-formaldehyde are commonly used, even though they are toxic.In this paper, polymer gel comprised of polyacrylamide (PAM) as a water soluble polymer and hydroquinone (HQ) and hexamethylene tetramine (HMTA) as organic cross-linking agents of low toxicity was prepared as water shut-off system to control water production. The effect of various parameters such as temperature, pH, salinity etc. was evaluated on the gelation time and gel strength using bottle testing and viscosity measurement methods.The gel formed by cross-linking HQ and HMTA with PAM is found to have high mechanical strength, form gels at high temperature of about 120°C and is cost-effective. The gelation temperature was varied from 85°C to almost 120°C to study the variations in the performance of the polymer system. This study suggests that the present low toxic gel system can be used in high temperature reservoirs.

Study of Salinity and pH Effects on Gelation Time of a Polymer Gel Using Central Composite Design Method

Experiments were conducted to investigate the main effects of salinity (NaCl) concentrations and pH factors and their interactions on the gelation time response of a polymer gel used in a water shutoff system in oil field reservoirs. Central composite design (CCD) was used to design experiments and a mathematical model building. The main advantage of CCD was to generate the quadratic mathematical model for the gelation time as functions of salinity and pH factors. Tests were limited and optimized by CCD points including low star (axial), low factorial, central, high factorial, and high star points. The evaluation of the data and the developed model were performed through the examination of graphical trend of residuals and a numerical approach. Analysis of variance (ANOVA) was used to estimate the amount of data variations from the model predictions. It was found that the model was significant at the 99% confidence against test data. The results showed that the gelation time was dependent more on pH than salinity. For low pH, the gelation time increased with increasing of the salinity, while for a high pH (>4) the relationship was inversed. The research shows that CCD can effectively be applied for the modeling of gelation time and finding an optimum condition to achieve maximum or minimum gelation time for different salinity and pH factors.

지진시 도시가스 공급정지를 위한 긴급대응시스템의 제안 및 적용

지진 시 광범위한 가스누출에 의한 화재는 인명피해 및 심각한 재산손실을 초래한다. 이러한 지진피해를 줄이는 효과적이 고도 합리적인 방법의 하나로 가스공급정지를 고려할 수 있다. 우리나라의 지진세기와 빈도 및 도시가스의 공급체계를 생각하면 지진시 가스공급정지는 일반 가정에서 개별차단기를 설치하여 실시하는 것보다 도시가스사에서 일괄적으로 수행하는 것이 보다 경제적이다. 본 연구에서는 지진 시 신속하게 가스공급 정지를 판단할 수 있는 긴급대응시스템을 제안하였다. 가스 공급지역내에서 계측된 지반가속도의 크기에 따라 적절한 조치를 취할 있도록 2단계의 기준지진도를 제안하였으며, 지진 피해를 입은 지역에 한해서 가스공급을 정지할 수 있도록 공급지역 블록화를 제안하였다. 또한, 실제 가스공급지역을 대상으로 하여 지반해석과 피해도 해석을 수행하여 기준지진도를 설정하고 긴급대응시스템을 적용하였다. Fires that result from the excessive leakage of gas due to earthquakes cause enormous loss of property as well as numerous human casualties. To prevent such disasters, an emergency gas shut-off system is considered to be one of the effective and rational methods. Considering the seismicity, the earthquake frequency and the gas-supply system of Korea, mass gas shut-off by a gas company is determined to be more cost-effective than individual gas shut-off by customers. In this study, an emergency response system was proposed that would shut off the gas supply immediately. Two different reference seismicities were proposed, to specify rapid response according to the measured seismicity. The gas supply area was divided into several gas shut-off blocks in order to facilitate the shut-off of gas supply in damaged blocks. This proposed system was implemented in the actual gas supply area with reference seismicities on the basis of seismic damage analysis.