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Standard for the operation safety assessment of gas system
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GB/T 50811-2012
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Basic data | Standard ID | GB/T 50811-2012 (GB/T50811-2012) | | Description (Translated English) | Standard for the operation safety assessment of gas system | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | P47 | | Classification of International Standard | 91.140.40 | | Word Count Estimation | 196,172 | | Quoted Standard | GB 50016; GB 50028; GB 50052; GB 50057; GB 50058; GB 50156; GB 50174; GB 50183; GB 50423; GB 50444; GB 50459; GB 50494; GB 3096; GB 11174; GB/T 11651; GB 12348; GB/T 13612; GB 17267; GB 17820; GB 18218; GB 19159; CJJ 63; CJJ 95; CJJ/T 148; CJJ/T 153; AQ 8 | | Regulation (derived from) | Ministry of Housing and Urban-Rural Development Bulletin No.1384 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This standard applies to residents facing has been officially put into operation, business, industrial enterprises, status quo in areas such as automotive fuel system safety assessment. This standard does not apply to gas production, city gate before gas | GB/T 50811-2012: Standard for the operation safety assessment of gas system---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 This standard is formulated in order to strengthen the supervision and management of gas system operation safety and promote the improvement of gas system operation safety management level.
1.0.2 This standard applies to the status quo safety assessment of gas systems that have been officially put into operation for residents, businesses, industrial enterprises, and automobiles.
This standard does not apply to the production of gas, the pipeline transportation of natural gas before city gate stations, and the production and use of biogas and straw gas.
1.0.3 When conducting safety assessment on the gas system, in addition to this standard, it should also comply with the current relevant national standards.
2 terms
2.0.1 Gas
It is a combustible gas that is of a public nature and meets the quality requirements for residents, businesses, industrial enterprises, automobiles and other users. Gas generally includes natural gas, liquefied petroleum gas and artificial gas.
2.0.2 gas system gas system
A system composed of stations, pipelines, user facilities and artificial gas production for gas storage, transmission and distribution and application.
2.0.3 subsystem subsystem
A relatively independent part of the gas system.
2.0.4 Evaluation unit assessment unit
On the basis of the analysis of risk and harmful factors, and according to the needs of evaluation objectives and evaluation methods, divide the system into units with limited and definite scope.
2.0.5 qualitative safety assessment qualitative safety assessment
A method of scientifically analyzing and judging with the help of experience, knowledge, observation and understanding of the law of development and change of things. Using this method can find out the dangerous and harmful factors in the system, and further put forward countermeasures based on these factors from the aspects of technology, management, education and training, etc., and control them to achieve the goal of system security.
2.0.6 quantitative safety assessment quantitative safety assessment
According to statistical data, test data, data of the same type and similar systems, and according to relevant standards, a type of method that applies scientific methods to construct mathematical models for quantitative evaluation.
2.0.7 Site assessment of facilities and operations
The safety evaluation of the surrounding environment, on-site facility status, operation, maintenance and on-site operation of the evaluation object.
2.0.8 management assessment management assessment
The safety evaluation is carried out on the safety management system, personnel, system, regulations, education and training of the enterprise to which the evaluation object belongs.
2.0.9 safety review table analysis safety review table analysis
List a series of inspection items related to safety in tabular form, and then check and analyze against the actual situation of the evaluation object. Through the safety checklist, the existing safety hazards can be found, and according to the severity of the hidden dangers, the safety status level of the evaluation object is given.
2.0.10 compressed natural gas (CNG) supply station
Compressed natural gas is unloaded, heated, pressure adjusted, stored, measured, odorized, and sent to the station of the urban gas transmission and distribution pipeline. It includes compressed natural gas storage and distribution station and compressed natural gas cylinder group supply station.
2.0.11 liquefied petroleum gasses(LPG)supply station
A general term for urban liquefied petroleum gas storage and distribution stations, storage stations, filling stations, gasification stations, and gas mixing stations, excluding bottle group gasification stations and bottled supply stations.
3 Basic Regulations
3.1 General provisions
3.1.1 During the period of production and operation activities, the gas operating enterprises shall carry out safety evaluation work on a regular basis. The hidden dangers of accidents found in the evaluation process should be rectified immediately or a treatment plan should be formulated for rectification within a time limit. When a large or above accident occurs in the gas system, the safety evaluation of the gas system in which the accident occurred must be carried out immediately.
3.1.2 For the self-safety evaluation of the gas system of the gas operation enterprise, the evaluation team can be composed of personnel who are familiar with the production technology and safety management of the enterprise, or a third-party professional service organization for safety production can be entrusted to conduct safety production evaluation of the gas system of the enterprise according to this standard. status for a safety assessment.
3.1.3 Statutory or administrative license-related safety evaluation work must be undertaken by a third-party safety production professional service organization that has the qualifications stipulated by the state and has no interest in it.
3.1.4 The number of checkpoints in the evaluation should be reasonably determined according to the actual situation of the evaluation object.
3.1.5 During the evaluation process, all items with 8 points or more (including 8 points) and underlined items in this standard checklist are key items. When they do not meet the requirements, corresponding countermeasures must be taken and explained.
3.2 Evaluation object
3.2.1 The determination of the evaluation object should follow the principle of relative independence and completeness, and the safety evaluation should be carried out with the whole gas system or some of its subsystems as the object.
3.2.2 When conducting safety evaluation for a system with a large scope, if the safety evaluation has been carried out separately for the subsystems, and the safety evaluation conclusion is within the validity period, the safety evaluation scores of the subsystems can be directly quoted and used as the safety evaluation of the whole system. basis for the conclusion.
3.3 Evaluation procedure and evaluation report
3.3.1 The gas system safety evaluation procedure should include. preliminary preparation, on-site inspection, rectification review, and preparation of safety evaluation report.
3.3.2 The content of the gas system safety evaluation report shall include. basic situation, identification and analysis of dangerous and harmful factors, division of evaluation units, qualitative and quantitative evaluation, safety countermeasures and suggestions, safety evaluation conclusions, etc.
3.3.3 The format of the safety evaluation report shall comply with the provisions of the current industry standard "General Rules for Safety Evaluation" AQ 8001.
3.4 Safety Evaluation Method
3.4.1 Quantitative safety evaluation methods should be adopted for gas system safety evaluation. When using qualitative safety evaluation methods, the safety checklist method should be the main method, supplemented by other safety evaluation methods.
3.4.2 The minimum score for each item of the safety checklist can be 0 points.
3.4.3 The scores of the facility and operation checklist and the safety management checklist of the evaluation object should be converted into the actual score when the full score is 100.
3.4.4 When the safety checklist is used for evaluation, the evaluation object facility and operation checklist and the safety management checklist shall be used for evaluation and scoring respectively, and the total score of the evaluation object shall be calculated according to the following formula.
In the formula. Q - the total score of the evaluation object;
Q1——Evaluation object facility and operation checklist score;
Q2 - Safety Management Checklist Score.
3.4.5 When the evaluation object has multiple subsystems, the total score of the subsystems is still calculated according to formula (3.4.4). The total score of the evaluation object should be calculated according to the following formula.
In the formula. S——the total score of evaluation object facility and operation evaluation;
Si - the total score of the subsystem of the evaluation object;
Pi——the weight of the subsystem of the evaluation object, the weight of the subsystem of the evaluation object is determined comprehensively according to the characteristics of the evaluation object, and the weight of the pipe network data collection and monitoring system should not be less than 0.05;
n——the number of all subsystems of the evaluation object.
3.4.6 When the evaluation object has missing items or special items in the checklist, the checklist should be deleted or added according to the actual situation, and the conversion should be carried out according to the requirements of Article 3.4.3 of this standard.
3.4.7 The evaluation conclusion should be made for the evaluation object according to the total score of the evaluation object according to Table 3.4.7.
Table 3.4.7 Comparison Table of Evaluation Scores and Evaluation Conclusions
4 Gas transmission and distribution stations
4.1 General provisions
4.1.1 The safety evaluation of gas transmission and distribution stations shall include facility and operation evaluation and management evaluation of gate stations, storage and distribution stations, pressure regulating stations and pressure regulating devices. When the above-mentioned stations are mixed with other gas stations, they shall still comply with the relevant provisions of this standard.
4.1.2 The evaluation units of gas transmission and distribution stations should be divided into. surrounding environment, general layout, road traffic in the station, gas quality, gas storage facilities, pressure regulators, safety valves and valves, filters, process pipelines, instruments and Automatic control system, fire protection and safety facilities, public auxiliary facilities, etc. In the evaluation work, the evaluation unit can be divided according to the actual situation of the evaluation object.
4.1.3 The facility and operation safety evaluation of gas transmission and distribution stations shall comply with the provisions of Sections 4.2, 4.3 and Appendix A of this standard. Management evaluation should comply with the provisions of Chapter 11 of this standard.
4.2 Gate station and storage and distribution station
4.2.1 The surrounding environment should evaluate the following contents.
1 The location conforms to the plan;
2 surrounding road conditions;
3 Fire separation distance between gas facilities in the station and buildings (structures) outside the station;
4 fire and rescue conditions;
5 Noise.
4.2.2 The general layout should evaluate the following contents.
1 General plane functional division;
2 safety isolation conditions;
3 The fire separation distance between buildings (structures) in the station;
4 Layout of the storage tank area of the storage and distribution station.
4.2.3 The road traffic in the station should evaluate the following contents.
1 station entrance and exit settings;
2 fire lanes;
3 Management of vehicles entering the production area of the station.
4.2.4 Gas quality should evaluate the following contents.
1 Temperament;
2 Odorize.
4.2.5 The gas storage facilities shall evaluate the following contents.
1 tank;
2 foundations;
3 low-pressure wet gas storage tank;
4 low-pressure dry gas storage tank;
5 High pressure gas storage tank.
4.2.6 The pressure regulator shall be evaluated according to Article 4.3.3 of this standard.
4.2.7 Safety valves and valves should evaluate the following.
1 Appearance and regular inspection of the safety valve;
2 The working status of the safety valve;
3 Appearance of the valve;
4 The operating environment of the valve;
5 The switch mark of the valve;
6 the tightness of the valve;
7 Maintenance of valves.
4.2.8 Filters shall evaluate the following.
1 Appearance of the filter;
2 filter maintenance;
3 Disposal of sewage and cleaning materials.
4.2.9 Process piping shall evaluate the following contents.
1 Pipe appearance and signs;
2 the tightness of the pipeline;
3 Insulation performance with pipelines outside the station.
4.2.10 Instrumentation and automatic control system should evaluate the following contents.
1 pressure gauge;
2 Gas concentration detection and alarm device;
3 Integrity and reliability of on-site measuring and testing instruments;
4 Integrity and reliability of remote display functions;
5 Integrity and reliability of overrun alarm and chain function;
6 The degree of automation of operation management.
4.2.11 The fire protection and safety facilities shall evaluate the following contents.
1 Ventilation conditions in process unit area;
2 Setting of safety warning signs;
3 The reliability of the fire water supply system;
4 Equipped with fire extinguishing equipment;
5 Explosion protection of electrical equipment;
6 The effectiveness of the lightning protection device;
7 Equipped with emergency rescue equipment.
4.2.12 The public auxiliary facilities shall evaluate the following contents.
1 power supply load;
2 Waterlogging prevention of power distribution room;
3 Intrusion prevention of power distribution room;
4 Emergency lighting of power distribution room;
5 Protection of cable trenches;
6 Antifreeze and heat preservation measures for water supply and drainage systems.
4.3 Pressure regulating station and pressure regulating device
4.3.1 The surrounding environment should evaluate the following contents.
1 installation location;
2 The installation position of heavy gas pressure regulating device;
3 Horizontal clear distance from other buildings (structures);
4 installation height;
5.The installation position of the underground pressure regulating box;
6 The installation position of the suspended pressure regulating box;
7 The location of the rooms on the top floor of public buildings with pressure regulating devices;
8 spacing and channel;
9 ambient temperature;
10 Fire Lane.
4.3.2 The buildings equipped with pressure regulating devices shall evaluate the following contents.
1 Separation from adjacent buildings;
2 fire resistance class;
3 The opening direction of doors and windows;
4 Stairs with flat roofs provided with pressure regulating devices;
5 Indoor floors.
4.3.3 The regulator shall evaluate the following.
1 The stability of the pressure regulating device;
2 Appearance of the regulator;
3 The operating status of the regulator;
4 inlet pressure;
5 outlet pressure and safety protection device;
6 Inlet and outlet pipe diameters and valves;
7 running noise;
8 Height of vent pipe orifice.
4.3.4 Safety valves and valves shall be evaluated in accordance with Article 4.2.7 of this standard, and the following contents shall also be evaluated.
1 Valve setting of high pressure and sub-high pressure regulator stations;
2 Valve settings for medium pressure surge stations.
4.3.5 Filters should be evaluated according to Article 4.2.8 of this standard.
4.3.6 Process piping shall be evaluated according to Article 4.2.9 of this standard.
4.3.7 Instruments and automatic control systems should be evaluated according to items 1, 3, 4, 5, and 6 of Article 4.2.10 of this standard.
4.3.8 The fire protection and safety facilities shall evaluate the following contents.
1 Ventilation conditions;
2 Setting of safety warning signs;
3 Equipped with fire extinguishing equipment;
4 Explosion protection of electrical equipment in special buildings with pressure regulating devices;
5.The effectiveness of the lightning protection device;
6 Protection of the pressure regulating device;
7 Explosion pressure relief measures;
8 Anticorrosion of underground surge tank;
9 The monitoring and alarming of the pressure regulating device installed in the room on the top floor of the public building;
10 release pipe;
11 Waterproofing of underground pressure regulating station;
12 Anti-static grounding.
4.3.9 The heating of the pressure regulating station shall evaluate the following contents.
1 fire management;
2 Boiler room door and window setting;
3 Chimney exhaust gas temperature;
4 The distance between the chimney and the discharge pipe;
5 flameout protection;
6 Case temperature and electrical isolation.
5 gas pipeline
5.1 General provisions
5.1.1 The safety evaluation of the steel gas pipeline with a design pressure not greater than 4.0MPa (gauge pressure) and the polyethylene gas pipeline with a maximum working pressure not greater than 0.7MPa (gauge pressure) shall include facility and operation evaluation and management evaluation.
5.1.2 Pipe sections with different regional grades and environments, different operating pressures, different media, and different operating years should be evaluated separately, and the weight of each pipe section should be assigned according to the actual situation to draw a comprehensive evaluation conclusion.
5.1.3 Evaluation units for gas pipelines should be divided into. pipeline laying, pipeline accessories, daily operation and maintenance, pipeline leakage inspection, pipeline anti-corrosion, etc. In the evaluation work, the evaluation unit can be divided according to the actual situation of the evaluation object.
5.1.4 The safety evaluation of gas pipeline facilities and operation shall comply with the provisions of Sections 5.2, 5.3 and Appendix B of this standard. Management evaluation should comply with the provisions of Chapter 11 of this standard.
5.2 Steel gas pipeline
5.2.1 The following contents shall be evaluated for pipeline laying.
1 The distance between the pipeline and surrounding buildings (structures) and other pipelines;
2 Burial depth of buried gas pipeline;
3 Pipe piercing and crossing;
4 Effective partition of pipelines;
5 Foundation soil conditions and stability of buried pipelines.
5.2.2 Piping accessories should evaluate the following.
1 valves and valve wells;
2 condensation tanks;
3 Length adjusters.
5.2.3 Routine operation and maintenance should evaluate the following contents.
1 regular line inspection;
2 safety education and publicity;
3 ground markings;
4 activities that endanger the pipeline;
5 Occupation of buildings (structures);
6 Construction monitoring.
5.2.4 The pipeline leakage inspection shall evaluate the following contents.
1 leak inspection system;
2 Testing instruments and personnel;
3 Check the cycle.
5.2.5 The following content should be evaluated for pipeline corrosion protection.
1 Temperament;
2 External anti-corrosion measures for above-ground pipelines;
3 Soil corrosion;
4 Anticorrosion coating of buried steel pipelines;
5 Cathodic protection measures for buried steel pipelines;
6 Stray current protection for buried steel pipelines.
5.3 Polyethylene gas pipes
5.3.1 In addition to evaluating the pipeline laying according to Article 5.2.1 of this standard, the following contents should also be evaluated.
1 Distance from the heat pipe;
2 Protection of the lead-in pipe;
3 tube position tracer.
5.3.2 Pipe accessories shall be evaluated according to Article 5.2.2 of this standard.
5.3.3 Routine operation and maintenance should be evaluated according to Article 5.2.3 of this standard.
5.3.4 Pipeline leakage inspection shall be evaluated according to Article 5.2.4 of this standard.
6 Compressed Natural Gas Station
6.1 General provisions
6.1.1 The safety evaluation of compressed natural gas stations with working pressure not greater than 25.0MPa (gauge pressure) shall include facility and operation evaluation and management evaluation of compressed natural gas filling stations and compressed natural gas supply stations. When the compressed natural gas station is mixed with other gas stations, it should still comply with the relevant provisions of this standard. This standard does not apply to the safety evaluation of compressed natural gas cylinder trucks and gas-filled vehicles.
6.1.2 The evaluation units of compressed natural gas stations should be divided into. surrounding environment, general layout, road traffic in the station, gas purification device, pressurization device, gas filling (unloading), gas storage device, pressure regulator, safety valve and Valves, filters, process pipelines, heating (hot water) devices, odorizing devices, instruments and automatic control systems, fire protection and safety facilities, public auxiliary facilities, etc. In the evaluation work, the evaluation unit can be divided according to the actual situation of the evaluation object.
6.1.3 The safety evaluation of compressed natural gas station facilities and operations shall comply with the provisions of Sections 6.2, 6.3 and Appendix C of this standard. Management evaluation should comply with the provisions of Chapter 11 of this standard.
6.2 Compressed natural gas filling station
6.2.1 The surrounding environment should evaluate the following contents.
1 The location conforms to the plan;
2 surrounding road conditions;
3 Adaptability between the scale of the station and the environment in which it is located;
4 Fire separation distance between gas facilities in the station and buildings (structures) outside the station;
5 fire and rescue conditions;
6 Noise.
6.2.2 The general layout should evaluate the following contents.
1 General plane functional division;
2 safety isolation conditions;
3 The fire separation distance between the gas facilities in the station and the buildings (structures) in the station.
6.2.3 The road traffic in the station should evaluate the following contents.
1 station entrance and exit settings;
2 site size and road width;
3 road surface smoothness and road surface material;
4 road markings;
5 Obstacles above the road;
6 anti-collision measures;
7 Management of vehicles entering the production area of the station.
6.2.4 The gas purification device shall evaluate the following contents.
1 Purified temperament;
2 The operating status of the purification device;
3 Sewage discharge and waste disposal;
4 Inspection of the purification device.
6.2.5 The pressurization device should evaluate the following.
1 running status;
2 reliability;
3 Exhaust pressure and exhaust temperature;
4 lubrication system;
5 cooling system;
6 valve setting;
7 the environment;
8 Sewage and waste disposal;
9 anti-vibration measures;
10 Inspection of compressor buffer tank and gas-liquid separator.
6.2.6 Adding (unloading) gas should evaluate the following contents.
1 Stopping of gas filling (unloading) vehicles;
2 Qualification inspection of gas filling (unloading) vehicles and gas cylinders;
3 Adding (unloading) gas operation;
4 Anti-static measures;
5 filling pressure;
6 Residual pressure after unloading;
7 add (unload) gas hose;
8 The operating status of the gas filling (unloading) machine or column.
6.2.7 The gas storage device shall evaluate the following contents.
1 Safety devices for gas storage wells and gas storage cylinders;
2 The operating status of gas storage wells and gas storage cylinders;
3 Inspection of gas storage wells and gas storage cylinders;
4 Quantity, volume and placement of small-volume gas cylinders.
6.2.8 The pressure regulator shall be evaluated according to Article 4.3.3 of this standard.
6.2.9 Safety valves and valves shall be evaluated according to Article 4.2.7 of this standard.
6.2.10 Filters should be evaluated according to Article 4.2.8 of this standard.
6.2.11 Process piping shall be evaluated according to Article 4.2.9 of this standard.
6.2.12 Instruments and automatic control systems should be evaluated according to Article 4.2.10 of this standard.
6.2.13 The fire protection and safety facilities shall be evaluated according to Article 4.2.11 of this standard.
6.2.14 Public auxiliary facilities shall be evaluated according to Article 4.2.12 of this standard.
6.3 CNG supply station
6.3.1 The surrounding environment should evaluate the following contents.
1 Surrounding road conditions;
2 Fire separation distance between gas facilities in the station and buildings (structures) outside the station;
3 Fire and ambulance conditions.
6.3.2 The general layout should evaluate the following contents.
1 General plane functional division;
2 safety isolation conditions;
3 The fire separation distance between the gas facilities in the station and the buildings (structures) in the station.
6.3.3 The road traffic in the station shall be evaluated according to Article 6.2.3 of this standard.
6.3.4 The unloading of gas cylinder trucks shall be evaluated according to items 1, 2, 3, 4, 6, 7, and 8 of Article 6.2.6 of this standard.
6.3.5 The gas storage cylinder group should evaluate the following contents.
1 total gas storage capacity;
2 Appearance of the gas cylinder;
3 Periodic inspection;
4 transport;
5 storage.
6.3.6 Gas tanks should be evaluated according to items 1, 2, and 6 of Article 4.2.5 of this standard.
6.3.7 The heating (hot water) device shall evaluate the following contents.
1 Measures against overpressure;
2 heat insulation measures;
3 Safety protection devices and working conditions of water heaters and water pumps;
4 Protection measures for rotating parts of the hot water pump;
5 Hot water quality.
6.3.8 The odorizing device shall be evaluated in accordance with Clause 2 of Article 4.2.4 of this standard.
6.3.9 The pressure regulator shall be evaluated according to Article 4.3.3 of this standard.
6.3.10 Safety valves and valves shall be evaluated according to Article 4.2.7 of this standard.
6.3.11 Filters should be evaluated according to Article 4.2.8 of this standard.
6.3.12 Process piping shall be evaluated according to Article 4.2.9 of this standard.
6.3.13 Instruments and automatic control systems should be evaluated according to Article 4.2.10 of this standard.
6.3.14 The fire protection and safety facilities shall be evaluated according to Article 4.2.11 of this standard.
6.3.15 Public auxiliary facilities shall be evaluated according to Article 4.2.12 of this standard.
7 Liquefied Petroleum Gas Station
7.1 General provisions
7.1.1 The safety assessment of liquefied petroleum gas stations shall include facility and operation evaluation and management evaluation of liquefied petroleum gas supply station, liquefied petroleum gas cylinder group gasification station, bottled liquefied petroleum gas supply station and liquefied petroleum gas vehicle filling station. When the liquefied petroleum gas station is mixed with other gas stations, it should still comply with the relevant provisions of this standard. This standard does not apply to the safety evaluation of liquefied petroleum gas train tank cars, special railway lines, car tank cars and bottle transport vehicles.
7.1.2 The evaluation units of liquefied petroleum gas stations should be divided into. surrounding environment, general layout, road traffic in the station, liquefied petroleum gas loading and unloading, compressors and hydrocarbon pumps, gas cylinder filling operations, gasification and gas mixing devices, Storage tanks, bottle groups (or bottle warehouses), pressure regulators, safety valves and valves, filters, process pipelines, instruments and automatic control systems, fire protection and safety facilities, public auxiliary facilities, etc. In the evaluation work, the evaluation can be divided according to the actual situation of the evaluation object...
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