CJJ 51-1992 Technical Specification for Emergency Repair and Maintenance of Urban Gas Pipeline Networks CJJ51-92
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Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Regulations for Emergency Repair and Maintenance of Urban Gas Pipe Networks
CJ51-92
1993Beijing
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Regulations for Emergency Repair and Maintenance of Urban Gas Pipe Networks
CJJ51-92
Editor: Shanghai Gas Company
Approval Department: Ministry of Construction of the People's Republic of China Implementation Date Issue: July 1, 1993
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Engineering Construction Standards Full Text Information System
Notice on the Release of the Industry Standard "Technical Regulations for Emergency Repair and Maintenance of Urban Gas Pipe Networks"
Jianbiao [1992] No. 858
According to the requirements of the former Ministry of Urban and Rural Construction and Environmental Protection (87) Chengkezi No. 276, the "Technical Regulations for Emergency Repair and Maintenance of Urban Gas Pipe Networks" edited by Shanghai Gas Company has been reviewed and approved as an industry standard, numbered CJJ51-92, and will be implemented from July 1, 1993.
This standard is managed by the China Municipal Engineering North China Design Institute, the technical unit responsible for urban gas standards of the Ministry of Construction, and its specific interpretation work is the responsibility of Shanghai Gas Company. This standard is organized and published by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
December 2, 1992
Engineering Construction Standards Full Text Information System
Engineering Construction Standards Full Text Information System
Chapter 1 General
Chapter 2 Gas Shutdown, Pressure Reduction, Fire and Ventilation for Emergency Repair and Maintenance Section 1
General Provisions
Section 2 Gas Shutdown and Pressure Reduction
Section 3 Fire
Section 4 Ventilation
Chapter 3 Emergency
Section 1 Operation Site
Section 2
Section 3
Leakage Emergency Repair
Fire and Explosion||t t||Chapter 4 Maintenance
Section 1
Section 2
General Provisions·
Pipeline Maintenance
Section 3 Pipeline Accessories and Equipment Maintenance
Chapter 5 Drawings and Documents
Section 1
General Provisions
Section 2 Drawings and Documents for Emergency Repair Works
Section 3 Drawings and Documents for Maintenance Works
Appendix I Explanation of Terms in the Regulations
Explanation of Terms Used in this Regulations
Appendix II
Additional Explanations
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Chapter 1 GeneralwwW.bzxz.Net
Article 1.0.1 This regulation is formulated to ensure the safe operation of urban gas pipeline networks and to protect the safety of life and property of the state and the people. Article 1.0.2 This regulation applies to the repair and maintenance of urban gas pipeline systems composed of cast iron and steel pipelines for transporting artificial coal gas, natural gas, and liquefied petroleum gas (gas phase) with a design pressure of less than 1.6MPa, as well as accessories and equipment connected to the pipelines.
Article 1.0.3 The repair and maintenance of urban gas pipeline networks shall be carried out by full-time personnel, who must receive professional technical training and pass the examination before they can take up their posts. The explosion-proof level of the equipment and devices used for the repair and maintenance of pipeline networks shall be IA or S. Article 1.0.4 The management department for the repair and maintenance of urban gas pipeline networks shall be equipped with full-time safety management personnel. Important equipment and important parts of urban gas pipelines should be marked with identification signs.
Article 1.0.5
In addition to implementing this regulation, emergency repair and maintenance of urban gas pipelines should also comply with the provisions of relevant national standards in force. Engineering Construction Standards Full-text Information System
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Chapter II Gas Shutdown,
Pressure Reduction, Hot Work and Ventilation for Emergency Repair and Maintenance
Section I General Provisions
Article 2.1.1 Emergency repair and maintenance of pipelines should be planned and implemented after approval. Emergency situations should be handled in an emergency manner and reported to the relevant departments at the same time. Article 2.1.2 A hierarchical approval system should be established for hot work operations on gas pipelines. Hot work units shall fill in hot work reports and hot work plans, and report to the safety management department. Operations can only be carried out after approval. Article 2.1.3 For gas shutoff, pressure reduction, hot work and ventilation operations in the pipeline network, there must be a dedicated person responsible for on-site command work, and a safety officer should be appointed. Article 2.1.4 For gas shutoff, pressure reduction, hot work and ventilation operations in the pipeline network, corresponding communication equipment, protective equipment and fire-fighting equipment must be configured. Section 2 Gas Shutoff and Pressure Reduction
Article 2.2.1 The preparation work before gas shutoff and pressure reduction should comply with the following provisions: 1. Users should be notified in advance of gas shutoff and pressure reduction operations; 2. The time of gas shutoff and pressure reduction operations should avoid peak gas consumption and thunderstorm weather; 3. During gas shutoff and pressure reduction operations, when bypass pipes are used for gas supply, they should be connected and installed before the operation and inspected in accordance with relevant regulations;
4. Gas shutoff operations that require cutting off the gas source should comply with the following provisions: 1. When shutting off the gas by closing the valve, an opening and closing test should be carried out in advance; 2. When using a blocking ball to block the gas, first check whether there are any debris in the pipe that hinders the blocking of the gas source.
Article 2.2.2 Gas shut-off and pressure reduction operations shall comply with the following provisions: 1. During gas shut-off operations, the gas source shall be reliably cut off, and the fuel in the operating section shall be safely discharged;
3. Pressure reduction operations shall be controlled by a dedicated person, and the gas pressure in the pipe shall not be less than 500Pa, and negative pressure in the pipe is strictly prohibited;
3. During gas shut-off or pressure reduction operations on liquefied petroleum gas pipelines, explosion-proof fans shall be used to disperse the liquefied petroleum gas accumulated in the work pit or operating area. Section 3 Hot Work
Article 2.3.1 When hot work is required on the operating gas pipeline network, safety, technical and other departments shall cooperate and monitor.
Article 2.3.2 During hot work, the work area should be marked out and guardrails should be set up. The work area should be kept free of air circulation and no gas accumulation. Article 2.3.3 When using a balloon to block the air temperature during hot work, the balloon should be protected and not damaged. Article 2.3.4 Before shutting down the gas and conducting hot work, the gas in the working section pipe shall be replaced and the following provisions shall be met:
1. When the direct replacement method is adopted, the concentration of the gas in the mixed gas in the pipe shall be sampled and tested. Only when it is below 20% of the lower explosion limit after three consecutive measurements (each time with an interval of about 5 minutes), hot work can be carried out;
2. When the indirect replacement method is adopted, the oxygen content in the mixed gas in the pipe shall be sampled and tested. Only when it meets the requirements after three consecutive measurements (each time with an interval of about 5 minutes), hot work can be carried out;
3. When gas impurities accumulate in the gas pipeline, inert gas shall be filled in for isolation;
4. During the process of shutting down the gas and conducting hot work, if there is an abnormal situation such as leakage or gas blowby, the operation shall be stopped and can only be continued after the abnormal situation is eliminated; 5. If the operation is interrupted or the continuous operation time is long, the gas content in the pipe shall be re-measured. Only when it meets the first and second clauses of this article, the operation can be continued. Article 2.3.5 Pneumatic hot work shall comply with the following provisions: 1. Pneumatic hot work can only be carried out when the pipelines and equipment are in an open area outdoors and it is confirmed that there will be no gas accumulation.
3. When carrying out pneumatic hot work, positive pressure must be maintained in the pipe, and the pressure should be controlled at 500800Pa;
3. The flame ignited by the hot work must be extinguished at any time by a reliable and effective method;
4. When connecting new and old steel pipes for hot work, measures should be taken to balance the potential of the new and old pipelines.
Article 2.3.6 The temporary flare installation on the liquefied petroleum gas pipeline shall comply with the following provisions:
1. A control valve shall be installed on the flare pipeline; 2. The flare shall be installed upwind of the gas-carrying operation point and maintain a safe distance;
3. The flare shall be more than 1.5m above the ground; 4. Effective fire-fighting equipment such as dry powder fire extinguishers shall be available at the flare site. Article 2.3.7 The operation of igniting the flare shall comply with the following provisions: 1. When manual ignition is used, ignition should be performed first and then the gas valve should be opened; 2. After the flare is ignited, the flame should be adjusted to ensure complete combustion and be supervised by a dedicated person;
3. When extinguishing the flare, the control valve must be closed first. Section 4 Communication
Article 2.4.1 Users shall be notified in advance of the resumption of gas supply. For gas outage and pressure reduction projects involving users, gas supply should not be resumed at night. Article 2.4.Article 2 After the gas outage operation is completed, the pipeline and equipment should be inspected and replaced before the gas supply can be restored. Article 2.4.3 After the pipeline and equipment are repaired or maintained, they should be fully inspected and passed before the gas supply can be restored. Strict safety precautions must be taken for ventilation operations. Article 2.4.4 During replacement operations, the setting of temporary relief points shall comply with the following regulations: 1. The number and location of relief points shall be determined according to on-site conditions, but relief points must be set at the end of the pipeline;
2. The relief pipe should avoid residential houses, open flames, high-voltage overhead wires and other places. When it is impossible to avoid residential houses and other places, protective measures should be taken; 3. The relief pipe should be more than 2m above the ground. Article 2.4.5 When gas is used to directly replace air, the gas pressure during replacement should be less than 5000Pa.
Article 2.4.6
Install a sampling tube on the pipe.
Article 2.4.7
Article 2.4.8
Before replacement, a pressure gauge should be installed at the starting section, and at the end of the release replacement release, there should be a dedicated person responsible for monitoring the pressure and sampling inspection After the pipeline is ventilated, the new ventilation pipe should be inspected throughout the line. Engineering Construction Standard Full Text Information System
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Chapter 3 Emergency Repair
Section 1 Operation Site
Article 3.1.1 Emergency repair personnel should wear duty signs. After arriving at the operation site, they should determine the warning area according to the degree of gas leakage. Open flames are strictly prohibited in the warning area, traffic should be controlled, and irrelevant personnel are strictly prohibited from entering.
Article 3.1.2 After the emergency repair personnel arrive at the operation site, they must provide timely first aid to poisoned and burned personnel.
When the gas and air mixture at the operation site reaches the following concentrations after measurement, it shall be classified as a contaminated area; 1. The concentration of gas in the air reaches or exceeds 20% of the lower explosion limit, and the concentration of carbon monoxide in the mixed gas is greater than 0.05%. Article 3.1.4 When working in a contaminated area, the following provisions shall be met: 1. Except for emergency repair personnel, firefighters, and rescue personnel, other personnel are strictly prohibited from entering the contaminated area without permission;
2. Operators entering the contaminated area shall be dressed in accordance with regulations, and must be supervised during operation. It is strictly prohibited to work alone;
3. It is strictly prohibited to use non-explosion-proof electromechanical equipment and instruments and meters in the contaminated area, such as video recorders, intercoms, electronic cameras, iodine tungsten lamps, etc.; 4. When working in a contaminated area, forced ventilation shall be carried out to remove accumulated gas, and sparks are strictly prohibited.
Article 3.1.5 When entering a liquefied petroleum gas contaminated area for operation, in addition to complying with the provisions of Article 3.1.4 of this Regulation, the following provisions shall also be met: 1. It is strictly forbidden to wear shoes with spikes and chemical fiber clothing to enter the contaminated area; 2. High insulation materials such as plastic pipes, rubber pipes and rubber sheets shall not be used. Article 3.1.6 After the pipeline and equipment are repaired, they shall be fully inspected and cleaned to prevent gas from entering interlayers, cellars, flues and underground facilities and other places that are not easily detected. Article 3.1.7 Safety measures shall be taken at the scene where the accident has not been clearly investigated and the hidden dangers have not been eliminated, and it is advisable to have a special person to monitor.
Section 2 Leakage Repair
Article 3.2.1 When the repair personnel enter the leakage site, they shall immediately control the gas source and disperse the accumulated gas. It is strictly forbidden to open and close electrical switches. Doors and windows should be opened indoors to enhance ventilation. When underground pipes leak, pits or holes can be dug to disperse the gas accumulated underground. Forced ventilation can be adopted when necessary.
Article 3.2.2 When excavating underground leakage points, the following provisions shall be met: 1. Emergency repair personnel shall consult pipeline data and determine the excavation point. When the leaked gas has penetrated into the surrounding buildings (structures), it shall be cleared in time; 2. When the excavation depth exceeds 1.5m, support shall be set according to the geology, and a special person shall be assigned to supervise the operator; when the depth exceeds 2.0m, a ladder or ramp that is convenient for going up and down shall be set; 3. Protective masks and fire-fighting equipment shall be provided for excavation and leak repair. Article 3.2.3 Emergency repair of gas pipeline leakage should be carried out after reducing the gas pressure or cutting off the gas source.
Article 3.2.4 If the gas leakage phenomenon cannot be effectively eliminated or the gas source cannot be cut off during emergency repair, the relevant departments shall be notified and safety protection work shall be done at the accident site. Article 3.2.5 After the repair and restoration of gas supply, a re-inspection shall be carried out. The repair personnel may evacuate the accident site only after confirming that there are no more unsafe factors. Article 3.2.6 The repair of leakage in basements and underground gas equipment shall comply with Article 4.1.4 of this Code and other relevant regulations. Article 3.2.7 In addition to complying with the provisions of Articles 3.2.1 to 3.2.6 of this Code, the repair of leakage in liquefied petroleum gas pipelines shall also comply with the following provisions: 1. When repairing leakage in liquefied petroleum gas pipelines, the pipeline potential must be tested, and there should be a grounding device, and the grounding resistance value should be less than or equal to 100Ω; 2. Forced ventilation must be carried out in liquefied petroleum gas contaminated areas, and other underground facilities should be checked to prevent liquefied petroleum gas from entering; Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3. When repairing leakage in liquefied petroleum gas, effective fire-fighting equipment such as dry powder should be available. When the leaked liquefied petroleum gas is difficult to control, the gas source should be cut off and the leaked liquefied petroleum gas should be diluted by spraying with a fire hose.
Article 3.2.8 The emergency repair work of pipeline leakage shall comply with the following provisions: 1. When installing ball-blocking balls at both ends of the pipeline cutting point, the ball-blocking balls should be protected and not damaged;
2. When the pipeline is opened with gas, clay or other fillers should be used to fill the cutting seam to reduce gas leakage;
3. When removing and installing blind plates, it should be done after reducing pressure or stopping gas. Operators should wear protective masks, wear safety belts, and be supervised by special personnel. Section 3 Fire and Explosion
Article 3.3.1 When fire, explosion and other accidents occur, endangering the safety of gas pipelines and equipment, rescue should be carried out together with the fire department. Article 3.3.2 The rescue work of gas fire should take measures such as cutting off the gas source or reducing the pressure to control the fire, and negative pressure should be prevented in the pipe. Article 3.3.3 After the fire is under control, the flames should be quickly extinguished, ventilation should be strengthened, and emergency repairs should be carried out in accordance with the relevant provisions of Section 2 of this chapter. Article 3.3.4 After the explosion of gas pipelines and equipment, emergency repair personnel should quickly control the gas source, prevent secondary disasters, and protect the accident site. Article 3.3.5 After the fire and explosion disaster is alleviated, the pipelines and equipment should be fully inspected to eliminate hidden dangers.
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KAONTKAca-Article 4 When working in a contaminated area, the following provisions shall be met: 1. Except for emergency repair personnel, firefighters, and rescue personnel, other personnel are strictly prohibited from entering the contaminated area without permission;
2. Operators entering the contaminated area shall be dressed in accordance with regulations, and must be supervised during work. It is strictly prohibited to work alone;
3. It is strictly prohibited to use non-explosion-proof electromechanical equipment and instruments and meters in the contaminated area, such as video recorders, intercoms, electronic cameras, iodine tungsten lamps, etc.; 4. When working in a contaminated area, forced ventilation should be carried out to remove accumulated gas, and sparks are strictly prohibited.
Article 3.1.5 When working in a liquefied petroleum gas contaminated area, in addition to complying with the provisions of Article 3.1.4 of this regulation, the following provisions shall also be met: 1. It is strictly prohibited to wear shoes with spikes and chemical fiber clothing to enter the contaminated area; 2. High insulation materials such as plastic pipes, rubber pipes and rubber sheets shall not be used. Article 3.1.6 After the pipeline and equipment are repaired, they should be fully inspected and cleaned to prevent gas from entering the interlayer, cellar, flue and underground facilities and other places that are not easy to detect. Article 3.1.7 Safety measures should be taken at the scene where the accident has not been investigated and the hidden dangers have not been eliminated, and it is advisable to have a special person to monitor.
Section 2 Leakage Repair
Article 3.2.1 When the repair personnel enter the leakage site, they should immediately control the gas source and disperse the accumulated gas. It is strictly forbidden to open and close electrical switches, and doors and windows should be opened indoors to enhance ventilation. When the underground pipe leaks, pits can be dug or holes can be drilled to disperse the gas accumulated underground. Forced ventilation can be adopted when necessary.
Article 3.2.2 When excavating underground leakage points, the following provisions shall be met: 1. Emergency repair personnel shall consult pipeline data and determine the excavation point. When the leaked gas has penetrated into the surrounding buildings (structures), it shall be cleared in time; 2. When the excavation depth exceeds 1.5m, support shall be set according to the geology, and a special person shall be assigned to supervise the operator; when the depth exceeds 2.0m, a ladder or ramp shall be set up to facilitate going up and down; 3. Excavation and leak repair operations shall be equipped with protective masks and fire-fighting equipment. Article 3.2.3 Emergency repair of gas pipeline leakage should be carried out after reducing the gas pressure or cutting off the gas source.
Article 3.2.4 If the leakage phenomenon cannot be effectively eliminated or the gas source cannot be cut off during emergency repair, the relevant departments shall be notified and safety protection work shall be done at the accident site. Article 3.2.5 After the emergency repair restores the gas supply, a re-inspection shall be carried out. After confirming that there are no more unsafe factors, the emergency repair personnel may evacuate the accident site. Article 3.2.6 Emergency repair of leakage in basements and underground gas equipment shall comply with Article 4.1.4 and other relevant provisions of this Code. Article 3.2.7 Emergency repair of leakage in liquefied petroleum gas pipelines shall comply with the following provisions in addition to the provisions of Articles 3.2.1 to 3.2.6 of this Code: 1. When repairing leakage in liquefied petroleum gas pipelines, the pipeline potential must be tested, and there should be a grounding device, and the grounding resistance value should be less than or equal to 100Ω; 2. Forced ventilation must be carried out in liquefied petroleum gas contaminated areas, and other underground facilities should be checked to prevent liquefied petroleum gas from entering; Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3. When repairing leakage in liquefied petroleum gas, effective fire-fighting equipment such as dry powder should be available. When the leaked liquefied petroleum gas is difficult to control, the gas source should be cut off and the leaked liquefied petroleum gas should be diluted by spraying with a fire hose.
Article 3.2.8 Emergency repairs for pipeline leakage shall comply with the following provisions: 1. When installing ball-blocking balls at both ends of the pipeline cutting point, the ball-blocking balls shall be protected and not damaged;
2. When opening holes in the pipeline with gas, clay or other fillers should be used to fill the cutting seams to reduce gas leakage;
3. When removing and installing blind plates, the operation shall be carried out after reducing the pressure or stopping the gas. The operators shall wear protective masks, fasten safety belts, and be supervised by special personnel. Section 3 Fire and Explosion
Article 3.3.1 When fire, explosion and other accidents occur, endangering the safety of gas pipelines and equipment, rescue shall be carried out together with the fire department. Article 3.3.2 In the rescue work of gas fire, methods such as cutting off the gas source or reducing the pressure shall be adopted to control the fire, and negative pressure shall be prevented from being generated in the pipe. Article 3.3.3 After the fire is controlled, the flames shall be extinguished quickly, ventilation on site shall be strengthened, and emergency repairs shall be carried out in accordance with the relevant provisions of Section 2 of this chapter. Article 3.3.4 After the explosion of gas pipelines and equipment, emergency repair personnel should quickly control the gas source, prevent secondary disasters, and protect the accident site. Article 3.3.5 After the fire and explosion disaster is alleviated, the pipelines and equipment should be fully inspected to eliminate hidden dangers.
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KAONTKAca-Article 4 When working in a contaminated area, the following provisions shall be met: 1. Except for emergency repair personnel, firefighters, and rescue personnel, other personnel are strictly prohibited from entering the contaminated area without permission;
2. Operators entering the contaminated area shall be dressed in accordance with regulations, and must be supervised during work. It is strictly prohibited to work alone;
3. It is strictly prohibited to use non-explosion-proof electromechanical equipment and instruments and meters in the contaminated area, such as video recorders, intercoms, electronic cameras, iodine tungsten lamps, etc.; 4. When working in a contaminated area, forced ventilation should be carried out to remove accumulated gas, and sparks are strictly prohibited.
Article 3.1.5 When working in a liquefied petroleum gas contaminated area, in addition to complying with the provisions of Article 3.1.4 of this regulation, the following provisions shall also be met: 1. It is strictly prohibited to wear shoes with spikes and chemical fiber clothing to enter the contaminated area; 2. High insulation materials such as plastic pipes, rubber pipes and rubber sheets shall not be used. Article 3.1.6 After the pipeline and equipment are repaired, they should be fully inspected and cleaned to prevent gas from entering the interlayer, cellar, flue and underground facilities and other places that are not easy to detect. Article 3.1.7 Safety measures should be taken at the scene where the accident has not been investigated and the hidden dangers have not been eliminated, and it is advisable to have a special person to monitor.
Section 2 Leakage Repair
Article 3.2.1 When the repair personnel enter the leakage site, they should immediately control the gas source and disperse the accumulated gas. It is strictly forbidden to open and close electrical switches, and doors and windows should be opened indoors to enhance ventilation. When the underground pipe leaks, pits can be dug or holes can be drilled to disperse the gas accumulated underground. Forced ventilation can be adopted when necessary.
Article 3.2.2 When excavating underground leakage points, the following provisions shall be met: 1. Emergency repair personnel shall consult pipeline data and determine the excavation point. When the leaked gas has penetrated into the surrounding buildings (structures), it shall be cleared in time; 2. When the excavation depth exceeds 1.5m, support shall be set according to the geology, and a special person shall be assigned to supervise the operator; when the depth exceeds 2.0m, a ladder or ramp shall be set up to facilitate going up and down; 3. Excavation and leak repair operations shall be equipped with protective masks and fire-fighting equipment. Article 3.2.3 Emergency repair of gas pipeline leakage should be carried out after reducing the gas pressure or cutting off the gas source.
Article 3.2.4 If the leakage phenomenon cannot be effectively eliminated or the gas source cannot be cut off during emergency repair, the relevant departments shall be notified and safety protection work shall be done at the accident site. Article 3.2.5 After the emergency repair restores the gas supply, a re-inspection shall be carried out. After confirming that there are no more unsafe factors, the emergency repair personnel may evacuate the accident site. Article 3.2.6 Emergency repair of leakage in basements and underground gas equipment shall comply with Article 4.1.4 and other relevant provisions of this Code. Article 3.2.7 Emergency repair of leakage in liquefied petroleum gas pipelines shall comply with the following provisions in addition to the provisions of Articles 3.2.1 to 3.2.6 of this Code: 1. When repairing leakage in liquefied petroleum gas pipelines, the pipeline potential must be tested, and there should be a grounding device, and the grounding resistance value should be less than or equal to 100Ω; 2. Forced ventilation must be carried out in liquefied petroleum gas contaminated areas, and other underground facilities should be checked to prevent liquefied petroleum gas from entering; Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3. When repairing leakage in liquefied petroleum gas, effective fire-fighting equipment such as dry powder should be available. When the leaked liquefied petroleum gas is difficult to control, the gas source should be cut off and the leaked liquefied petroleum gas should be diluted by spraying with a fire hose.
Article 3.2.8 Emergency repairs for pipeline leakage shall comply with the following provisions: 1. When installing ball-blocking balls at both ends of the pipeline cutting point, the ball-blocking balls shall be protected and not damaged;
2. When opening holes in the pipeline with gas, clay or other fillers should be used to fill the cutting seams to reduce gas leakage;
3. When removing and installing blind plates, the operation shall be carried out after reducing the pressure or stopping the gas. The operators shall wear protective masks, fasten safety belts, and be supervised by special personnel. Section 3 Fire and Explosion
Article 3.3.1 When fire, explosion and other accidents occur, endangering the safety of gas pipelines and equipment, rescue shall be carried out together with the fire department. Article 3.3.2 In the rescue work of gas fire, methods such as cutting off the gas source or reducing the pressure shall be adopted to control the fire, and negative pressure shall be prevented from being generated in the pipe. Article 3.3.3 After the fire is controlled, the flames shall be extinguished quickly, ventilation on site shall be strengthened, and emergency repairs shall be carried out in accordance with the relevant provisions of Section 2 of this chapter. Article 3.3.4 After the explosion of gas pipelines and equipment, emergency repair personnel should quickly control the gas source, prevent secondary disasters, and protect the accident site. Article 3.3.5 After the fire and explosion disaster is alleviated, the pipelines and equipment should be fully inspected to eliminate hidden dangers.
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