Some standard content:
National Standard of the People's Republic of China
Safety code for gas of industrial enterprises
Safety code for gas of industrial enterprisesUDC658.382：614
GB 6222-86
This code is specially formulated to protect the safety and health of employees and prevent gas poisoning, fire and explosion accidents. This code is applicable to the design, manufacture, construction, operation, management and maintenance of production, recovery, transmission, distribution, storage and use facilities of gas such as generators, water gas stoves, semi-water gas stoves, blast furnaces, coke ovens, vertical continuous carbonization furnaces, converters and natural gas with a pressure less than or equal to 12×10sPa (12.24kgf/cm2) (excluding mining and transmission and distribution outside the factory). All safety-related aspects must comply with this code and the relevant national standards, regulations and specifications in force. This code does not apply to urban gas urban main pipes, branch pipes and courtyard pipe networks and pressure regulating facilities, liquefied petroleum gas, etc. When the relevant provisions of this Regulation cannot be implemented due to the adoption of new technologies, imported technologies and imported projects, corresponding safety regulations (with scientific basis attached) shall be proposed and reported to the labor departments of provinces, autonomous regions and municipalities directly under the Central Government for approval and filed with the Ministry of Labor and Personnel before use and operation. Each enterprise shall formulate implementation rules based on this Regulation. 1 Basic requirements
1.1 The design of gas facilities shall be safe and reliable. For heavy manual labor and dangerous operations, mechanization and automation measures shall be adopted as a priority.
1.2 The design of major gas facilities shall be designed by design units holding design licenses issued by the competent industrial ministry or relevant departments of provinces, autonomous regions and municipalities directly under the Central Government. The safety department of the gas facility user unit shall participate in the design review. The design and manufacturing shall have complete technical documents. The designers of gas facilities must be assessed by the relevant departments. Those who fail to meet the requirements shall not independently carry out the design work. 1.3 The welding work of gas facilities must be performed by welders holding qualification certificates. 1.4 The construction must be carried out according to the design. If there is any modification, it shall be approved in writing by the design unit. The concealed parts of the project shall be closed only after being inspected and approved by the gas user and the construction unit. After the construction is completed, the construction unit shall prepare a completion description and completion drawings and deliver them to the user for archiving.
1.5 Newly built, rebuilt and overhauled gas facilities must be inspected and accepted to prove that they meet safety requirements and have safety regulations before they can be put into operation. The safety department of the gas user unit shall participate in the acceptance of gas facilities. 1.6 If the gas facilities of existing enterprises do not meet the requirements of this regulation, they should be resolved during reconstruction, expansion, overhaul or technical transformation. Before they are resolved, safety measures should be taken and reported to the labor departments of provinces, autonomous regions and municipalities directly under the central government for filing. 1.7 Gas equipment and pipelines should be clearly divided into management areas, and a strict safety production responsibility system should be established. 1.8 Various major gas equipment, valves, vent pipes, pipeline supports, etc. should be numbered, and the numbers should be marked in obvious places. The gas management room should hang a gas process flow chart with the numbers of equipment and auxiliary devices marked on the chart. 1.9 Units with gas facilities should establish the following systems: 1.9.1 Establish a technical archive management system for gas facilities, and archive and preserve complete information such as equipment drawings, technical documents, equipment inspection reports, completion instructions, and completion drawings.
1.9.2 Equipment cards that record the overhaul, medium repair, and major failures of gas facilities. 1.9.3 Cards that record the operation of gas facilities. 1.9.4 Gas facilities should be inspected daily, quarterly, and annually. Equipment corrosion, pipeline wall thickness, bracket elevation, etc. should be inspected once a year, and the inspection results should be recorded for future reference.
National Bureau of Standards Issued on April 9, 1986
Implementation on December 1, 1986
GB 6222--86
1.10 The carbon monoxide concentration in gas hazardous areas (such as basements, booster stations, trenches, hot blast furnaces, and various gas generation facilities) must be measured regularly, and carbon monoxide monitoring devices should be installed at key locations. The maximum permissible concentration of carbon monoxide in the working environment is 30 mg/m3. 1.11 Personnel engaged in gas work must receive safety knowledge education and technical operation training. Only those who pass the examination are allowed to work independently, and they must be retested every two years. Operators of gas facilities should undergo a physical examination every one to two years, and the results of the physical examination will be recorded on the "Employee Health Monitoring Card". Those who do not meet the requirements shall not engage in gas operations. 1.12 All units with gas facilities should have full-time or part-time technical personnel responsible for the gas safety management of the unit. 2 Gas production, recovery and purification
2.1 Production and purification of generator gas
2.1.1 Regional layout of gas generation station
2.1.1.1 The gas generation station should be arranged on the windward side of the minimum frequency wind direction in summer for the main buildings and structures in the factory area. 2.1.1.2 Buildings and structures such as outdoor gas purification equipment, circulating water system, tar system and coal yard should be arranged on the upwind side of the summer minimum frequency wind direction of the main plant, gas compressor room, air blower room, etc. of the gas generating station. The impact of water mist emitted by the cooling tower on the surrounding area should also be considered.
2.1.1.3 The fire protection distance between the main plant and purification area of the newly built cold gas generating station and other production workshops shall comply with the provisions of TJ16-74 "Code for Fire Protection Design of Buildings" (Trial). 2.1.1.4 Special railways and roads other than gas generating stations shall not pass through the station area. 2.1.1.5 The gas generating station area shall be equipped with a fire truck. The fire truck of a small hot gas station with an attached gas workshop can be considered together with the fire truck of the adjacent plant.
2.1.1.6 Equipment and buildings that are not related to the product and are prone to fire shall not be set up in the gas generating station area. 2.1.1.? The distance between the hot gas generator plant and the production workshop shall meet the requirements of Table 1: Table 1
Hot gas production plate
(Nm2/h)
Distance to the production workshop
Can be directly connected to the user workshop,
But it must be separated by a firewall
Not less than 13m
Distance to other workshops
Not less than 13m
2.1.1.8 The gas compressor and air blower should be arranged in separate rooms. If arranged in the same room, explosion-proof electrical equipment should be used.
2.1.2 Safety requirements for gas station plant buildings 2.1.2.1 The design of the main plant of the gas station shall meet the following requirements: a. The main plant is a Class B production plant, and its fire resistance level should not be lower than Level 2. b. The main plant is a plant without explosion hazard, but explosion-proof measures should be taken for the coal storage layer. When there is no possibility of gas leakage in the coal hopper, or when the coal storage seam is an open or semi-open building, the coal storage seam is a H-2 fire hazard place: c. Each floor of the main plant should be equipped with a safe exit. 2.1.2.2 Other buildings of the gas station should meet the following requirements: a. The gas pressurizing room and the machine room should comply with the provisions of Chapter 5 of this Regulation; the tar pump room and the tar depot are H-1 fire hazard places; b.
The coal yard is an H-3 fire hazard place;
The coal storage hopper room, the crushing and screening room, and the coal conveyor belt corridor are H-2 fire hazard places; d.
GB 6222-86
e. The gas pipeline drainer room is a Class B production room with explosion hazard, which should be well ventilated and its fire resistance level should not be lower than Class III. 2.1.2.3 The central control room of the gas generating station shall be equipped with a dispatch telephone or general telephone to keep in touch with the dispatch room, users and various production units of the gas generating station, and shall be equipped with a saturated air pressure gauge, thermometer, flow meter at the inlet of the gas generator, a gas pressure gauge, thermometer at the outlet of the gas generator, gas high and low pressure and air low pressure alarm devices and light signals, etc. If the old gas generating station does not have the above devices, it shall be added according to the conditions.
2.1.3 Equipment structure and calculated pressure, tightness test 2.1.3.1 If there is a fire detection hole on the top of the gas generator, the fire detection hole shall be sealed to ensure that there is no gas leakage when watching the fire from the fire detection hole and inserting the spike.
2.1.3.2 The welding of gas equipment shall comply with the relevant provisions of GBJ236-82 "Construction and Acceptance Specifications for Field Equipment and Industrial Pipeline Welding Engineering".
2.1.8.3 The design, manufacture, installation and inspection of gas furnaces with flood jackets must comply with the relevant provisions of the current "Regulations on Safety Supervision of Steam Boilers".
2.1.3.4 The water supply of the water jacket of the gas generator should be softened water, and a drain valve should be installed at the bottom of the water jacket. 2.1.3.5 The water jacket steam drum should be equipped with a safety valve and an automatic water level controller, and the water inlet pipe should be equipped with a check valve. It is strictly forbidden to install valves on the connecting pipe between the water jacket and the steam drum.
2.1.3.6 The inlet air pipe of the gas generator should be equipped with valves, check valves and steam purge devices. The end of the air main should be equipped with an explosion-proof membrane and a vent pipe, and the vent pipe should be connected to the outdoors. 2.1.3.7 The air blower of the gasifier should be powered by two power supplies. If it is difficult to supply power by two power supplies, safety measures should be taken to prevent power outages.
2.1.3.8 The gas pipeline leading out of the hot gasifier should be equipped with a partition device. If a disc valve is used, its operating capstan should be located near the gasifier for easy operation, and a venting pipe should be provided in front of the valve. 2.1.3.9 The connecting pipe between the gasifier gasifying bituminous coal and the vertical pipe or cyclone dust collector should have measures to eliminate dust accumulation in the pipe. 2.1.3.10 The vertical pipe after the newly built or expanded gasifier, the top of the dust collector or the outlet pipe of the gasifier should be equipped with a device that can automatically release the gas.
2.1.3.11 Electric tar precipitator
a: A partition device should be installed after the inlet of the electric tar precipitator and the washing tower, b. The electric tar precipitator should be equipped with an explosion relief valve;
c. The electrostatic precipitator shall be equipped with a device that can cut off the power supply when one of the following situations occurs: the oxygen content of the gas reaches 1%, the gas pressure is lower than 50Pa (5.1mmHz0), and the temperature of the steam insulation box is lower than the specified value (generally not lower than the gas inlet temperature plus 25℃). d. The electrostatic precipitator shall be equipped with a vent pipe and a steam pipe, and the bottom of the electrostatic precipitator shall be equipped with an insulation or heating device: e. The electrostatic precipitator sedimentation pipe shall be equipped with a connecting pipe with a valve: the provisions of b and c of 2.5.4.2 of this regulation shall be complied with. g. 2.1.3.12 The scrubber shall comply with the relevant provisions of 2.3.2.3 of this regulation. 2.1.3.13 The oxygen content of the gas of each gasifier shall be analyzed before it is connected to the network. When the oxygen content is greater than 1%, it is prohibited to connect to the network. 2.1.3.14 There should be electrical interlocks between the various machines in the continuous mechanized coal transportation and slag discharge system. 2.1.3.15 The effective height of the water seal or oil seal of the equipment before the gasifier pressurizer: if the maximum working pressure is less than 3×103Pa (306mmH,0), it is the maximum working pressure water column height plus 150mm, but not less than 250mm; if the maximum working pressure is greater than or equal to 3×103Pa (306mmH0), it is 1.5 times the maximum working pressure water column height. The effective height of the water seal or oil seal of the equipment after the gasifier pressurizer shall comply with the provisions of 4.2.2.1 of this regulation. 2.1.3.16 The effective height of the vent water seal in the bell valve shall be equal to the water column height of the maximum working pressure at the outlet of the gasifier plus 50mm.
GB 6222—86
2.1.3.17 The pressure of the tightness test of gas purification equipment is the same as that of the pipeline system, and the relevant provisions of 3.4.6 of this regulation shall be followed. 2.2 Production and purification of water gas (including semi-water gas) 2.2.1 Regional layout
2.2.1.1 The water gas production plant shall be located on the upwind side of the main buildings and structures in the plant area with the minimum frequency of wind direction in summer. 2.2.1.2 The center distance between multiple water gas generators shall comply with the provisions of Table 2. Table 2
Diameter of the furnace
Gas output of the furnace
1000~3500
5000～7000
8000~18000
Center distance between furnaces
2.2.1.3 The operation control room of the water-gas production workshop can be set up next to the workshop, but it should be separated by a firewall. The control room must be equipped with a dispatching telephone to keep in touch with the workshop using gas and reasonably allocate the gas usage to ensure the stability of the pipeline system pressure. 2.2.1.4 The water-gas production workshop should have a dedicated analysis station. In addition to analyzing the production control indicators, safety indicators should also be analyzed and measured regularly.
2.2.1.5 The exhaust smoke window of the intermittent water-gas furnace should be set up separately and should not share the flue with other gas equipment. 2.2.1.6 In the water-gas plant area, trenches where people often work should be avoided. If it is necessary to set up, there should be good ventilation facilities to prevent gas accumulation.
2.2.1.7 In the production, cooling and purification areas of water gas, facilities and buildings that are not related to this process and are prone to fire are not allowed to be arranged.
2.2.2 Safety requirements for building buildings
2.2.2.1 Water gas production plants should be arranged in a single row. The fire hazard of the plant belongs to Class A, and the fire resistance level of the plant is not less than Class II. The fire hazard of semi-water gas production plants belongs to Class B (when the same device produces water gas and semi-water gas, it should be handled according to the requirements of water gas). The fire protection distance should comply with the relevant provisions of the "Code for Fire Protection Design of Buildings" (Trial). 2.2.2.2 Water gas production plants are generally open or semi-open. It is advisable to use a spark-free floor, which should be flat and easy to clean. Each floor of the plant should be equipped with a safe evacuation door and stairs. There should be a fire truck in the area of the water gas production plant. 2.2.2.3 The electrical equipment of the water-gas production plant shall be designed in accordance with the Q-2 explosion-proof requirements. 2.2.3 Equipment structure (water-gas, semi-water-gas) 2.2.3.1 The silo layer of the water-gas generator should be equipped with ventilation facilities. The feeder between the funnel of the coal and coke silo and the feed port of the gasifier should be sealed or partially sealed.
2.2.3.2 The welding of water-gas equipment shall comply with the provisions of 2.1.3.2 of this Code. 2.2.3.3 The design, manufacture, installation, inspection and use of water-gas furnaces with water jackets shall comply with the provisions of 2.1.3.3, 2.1.3.4 and 2.1.3.5 of this Code.
2.2.3.4 The end of the air duct leading to the gasifier shall be equipped with an explosion-proof membrane and a vent pipe. 2.2.3.5 The effective height of the water seal of the washing tower drain pipe is the calculated pressure of the washing tower plus 500mm. 2.2.3.6 Electrostatic precipitator
a. The inlet and outlet pipes of the electrostatic precipitator shall be equipped with reliable partition devices; the inlet and outlet of the electrostatic precipitator shall be equipped with gas pressure gauges; the gas pressure at the inlet of the electrostatic precipitator (gas tank outlet) during normal operationb.
GB 6222-86
The gas pressure at the outlet of the electrostatic precipitator (compressor inlet) shall not be less than 5×102Pa (51mmH20). When it is lower than this value, the gas compressor must be stopped. c. The oxygen content of water gas in the electrostatic precipitator shall be less than 0.6% during normal operation. When it is greater than 0.6%, an alarm signal shall be issued. When it reaches 0.8%, the power supply of the electrostatic precipitator shall be cut off immediately. 2.2.4 The oxygen content of water gas (semi-water gas) must be strictly controlled. Generally, an automatic analyzer is installed, and manual analysis should be performed for regular spot checks. Under normal circumstances, the oxygen content of the main gas should be less than 0.6%. When the oxygen content of the gas in a single furnace system reaches 1%, the furnace must be stopped.
2.3 Recovery and purification of blast furnace gas
2.3.1 Regional layout
2.3.1.1 New blast furnaces should be arranged on the upwind side of the minimum frequency wind direction in summer in residential areas, and the distance between the edge of the plant and the edge of the residential area shall not be less than 1000m.
2.3.1.2 The dust collector of the new blast furnace should be located 10m away from the iron mouth and slag mouth of the blast furnace. If the old equipment does not meet the above regulations, it should be resolved during the reconstruction.
2.3.1.3 Avoid setting up trenches where people often work near the newly built blast furnace gas area. If it is necessary to set up trenches, air should be circulated in the trenches to prevent gas accumulation.
2.3.1.4 The factory office and living room should be located on the leeward side of the factory's minimum frequency wind direction in summer, 100 meters away from the blast furnace. The furnace front lounge, bathroom, and dressing room are not subject to this restriction. 2.3.1.5 The operation room and instrument room in the factory should be located on the leeward side of the factory's minimum frequency wind direction in summer, and should not be located near equipment that may often leak gas. Those that do not meet this requirement must be relocated during the recent major or medium repairs. 2.3.1.6 The newly built blast furnace gas purification equipment must be arranged in a spacious area to ensure good ventilation between the equipment. The net distance between each individual equipment (washing tower, dust collector, etc.) shall not be less than 2 meters, and the net distance between the equipment and the building shall not be less than 3 meters. 2.3.1.7 No other factory buildings should be arranged in the gas area. 2.3.2 Equipment structure
2.3.2.1 Blast furnace
a. The cooling equipment of the blast furnace shall be tightly sealed with the furnace shell, tuyere, slag mouth and each water jacket. b. The box of the soft probe, the flange of the inspection hole cover, and the shaft bearing of the sprocket or rope pulley shall be tightly sealed. c. Steam or nitrogen shall be used to seal the hard probe and the probe hole. d. The charging equipment on the top of the blast furnace must meet the following requirements: Steam or nitrogen shall be used to seal the large and small bell rods of the double bell equipment on the top of the furnace. The contact surface between the bell and the hopper shall be made of wear-resistant materials, ground and inspected to be qualified. The upper and lower sealing valves of the silo on the top of the furnace without bell shall use soft seals made of heat-resistant materials and hard seals made of hard alloy. The outer shell of the rotary distributor shall be tightly sealed with the fixed support. The throat shall have a steam or nitrogen nozzle.
The release capacity of the newly built or rebuilt blast furnace release pipe shall be able to release all the gas under normal pressure, and the gas shall be discharged as soon as possible when the blast furnace is shut down.
The height of the furnace top vent pipe should be more than 5m higher than the winch rope pulley workbench. The installation position of the vent valve of the vent pipe should be convenient for operation on the furnace platform. The contact between the vent valve seat and the valve disc should be close, and the contact surface should be external contact. 2.3.2.2 Gravity dust collector
a. The dust collector should be equipped with a steam or nitrogen pipe joint, b. There should be a steam or nitrogen pipe joint between the top of the dust collector and the cut-off valve. A vent valve should be installed at the top of the dust collector and the highest point of each gas pipeline.
2.3.2.3 Scrubber, Venturi Scrubber and Sludge Collector. a. The effective height of the water seal of the sewage discharge pipe of the washing tower, venturi scrubber, sludge collector and dehydrator of the atmospheric blast furnace should be 1.5 times the maximum pressure of the blast furnace top and not less than 3m, b. The washing tower, venturi scrubber, buoy box under the mortar collector and dehydrator of the high-pressure blast furnace shall use drainage control devices that meet the requirements of high-pressure gas, and have reliable water level indicators and water level alarms. The water level indicators and water level alarms shall be reflected in the management room.
c. Various washing devices shall be equipped with steam or nitrogen pipe joints. A safety pressure relief device shall be installed on the top of the scrubber and can be operated on the ground.
d. There shall be a double manhole at each layer of the water nozzle of the washing tower. Each layer of the nozzle shall be equipped with a railing and a platform. e: The adjustable venturi and pressure reducing valve group must use reliable and tight shaft seals and have a wider maintenance platform. f. A reliable partition device shall be installed between each blast furnace gas purification facility and the clean gas main. 2.3.2.4 Electrostatic precipitator
8. The electrostatic precipitator shall comply with the provisions of a in 2.2.3.6. b. The electrostatic precipitator should be equipped with a device that can automatically cut off the high-voltage power supply and send out sound and light signals when the gas pressure is lower than 5×102Pa (51mmHzO).
c. The electrostatic precipitator should be equipped with a device that can automatically cut off the power supply when the oxygen content of blast furnace gas reaches 1%; d. The electrostatic precipitator should be equipped with a venting pipe and a steam pipe; e. A connecting pipe with a valve should be installed between the sedimentation pipes (plates) of the electrostatic precipitator to vent the dead corner gas or air. 2.3.2.5 Bag dust collector (applicable to medium and small blast furnaces). Each outlet of the bag dust collector should be equipped with a reliable partition device; b. Each box of the bag dust collector should be equipped with a venting pipe: c. The bag dust collector should be equipped with a gas high and low temperature alarm and a low pressure alarm device, d. The bag dust collector box should use an explosion relief device. ：2.3.2.6 Excess pressure turbine generator set
：The outlet gas pipeline of the excess pressure turbine must be equipped with a reliable isolating device, and the inlet pipeline must also be equipped with an emergency shut-off valve. When the turbine speed and the gas inlet pressure and temperature exceed the regulations, the gas can be cut off generally within 1 second. The turbine stops automatically, b. The gas inlet pipeline of the excess pressure turbine must be equipped with a speed regulating device, c. The excess pressure turbine must be equipped with a reliable and tight shaft sealing device, d. The generator set should have reliable grid connection and electrical protection devices, adjustment, monitoring and automatic control instruments and necessary communication signals; e. In addition to being equipped in the control room, the starting and stopping devices of the excess pressure turbine can also be added as needed. 2.3.3 The tightness test pressure of the gas cleaning system shall comply with the relevant provisions of 3.4.6.1 of this regulation. 2.4 Recovery and purification of coke oven gas
2.4.1 Area layout
2.4.1.1 New coke ovens should be arranged on the upwind side of the residential area with the lowest frequency wind direction in summer. The distance between the edge of the plant and the edge of the residential area must be more than 1,000m, and there should be a protective forest belt in between. 2.4.1.2 In steel joint ventures, coke ovens should be arranged close to ironmaking and parallel to the axis of the blast furnace group. The longitudinal axis of the coke oven group should have the smallest angle with the local highest frequency wind direction.
2.4.1.3 The administrative and welfare facilities of the newly built coking plant should be arranged on the leeward side of the plant area with the lowest frequency wind direction in summer. 2.4.2 Area layout of gas cooling and purification
2.4.2.1 The gas cooling and purification area of the newly built coke oven should be arranged on the machine side or one end of the coke oven, and the outermost edge of its building (structure) should be no less than 40m away from the edge of the coke oven body. Medium and small coke ovens can be appropriately reduced, but shall not be less than 30m. 2.4.2.2 The gas cooling and purification area shall comply with the provisions of 2.1.1.4~2.1.1.7 of this regulation. 2.4.2.3 The layout of various facilities of the gas system in the newly built gas cooling and purification area shall meet the following requirements a. The gas primary cooler (tower) shall be directly opposite the exhaust fan room and arranged in a single row horizontally. The distance between the center line of the primary cooler outlet gas collection pipe and the row line of the exhaust fan room shall not be less than 10m. 3.12
GB 6222--86
b. The distance between various towers of the gas cooling and purification system and the center line of the dedicated railway in the factory area shall not be less than 20m, and the distance from the nearest edge of the main road in the factory area shall not be less than 10m. 2.4.3 Equipment structure
2.4.3.1 Equipment structure of the gas recovery system a. The coal loading funnel of the coal loading car should be equipped with facilities to prevent gas and smoke from leaking. The coal loading hole cover and cover seat of the carbonization chamber, and the furnace door and door frame should be kept tight;
b. Ammonia water, steam and other injection facilities should be installed in the riser, c. A gas collecting pipe should be equipped with two venting pipes, which are respectively located on both sides of the suction elbow and should be more than 5m above the gas collecting pipe platform. The opening and closing of the venting pipe should be able to be operated on the gas collecting pipe platform. The venting pipe should be equipped with a steam pipe, d. An industrial water pipe for accidents should be installed at the end of the gas collecting pipe, e. A cleaning hole should be set on the upper part of the gas collecting pipe. The spacing between them and the structural requirements of the platform should facilitate the cleaning of all pipes, and the cleaning hole should be kept tight and leak-proof,
f. For coke ovens with double gas collecting pipes, the height of the cross pipe should be able to allow the coal loading car to pass and operate safely, and a fireproof cover should be installed at the lower part of the cross pipe section facing the riser;
g: Automatic pressure regulating flaps and manual pressure regulating flaps should be installed on the suction elbow, h. There should be safe exits at both ends of the coke oven basement, and there should be inclined ladders, and the ventilation of the basement should be strengthened. The clear height of the basement gas distribution pipe should not be less than 1.8m;
1. The exchange device must operate in the order of turning off the gas first, then exchanging air and exhaust gas, and finally turning on the gas. Make sure that the airflow direction in the furnace conforms to the coke oven heating system diagram. After the exchange, make sure that the airflow direction in the furnace is completely opposite to that before the exchange, and the gas components of the exchange device must be kept tight,
j. When the adjustment flap (or plug) of the exhaust flap is fully closed, an appropriate gap must be left. In any case, the combustion system must have a certain suction force.
k, the coke oven basement, the corridors on both sides of the coke oven, the instrument room on the bottom floor of the coal tower, the bottom floor of the coal tower furnace platform, the gas collection room, and the instrument room are all Class A production fire hazards! Room,
1. The design and manufacture of the riser with gasification cooling must comply with the current "Steam Boiler Safety Supervision Regulations" regulations: The coke oven basement, the flue corridors on both sides, the bottom floor of the coal tower furnace platform, the switch instrument room, etc., should select electrical equipment according to Q-3 level, and should be equipped with emergency lighting.
2.4.3.2 Equipment structure of coal gas cooling and purification system a. Various towers in the gas cooling and purification system should be equipped with steam pipes for purging; b. Pressure gauges and thermometers should be installed on the inlet and outlet pipes of various towers; c. The oil discharge pipe of the tower should be equipped with a valve, and the oil pipe should be immersed in the oil overflow tank. The effective height of the oil seal is the calculated pressure plus 500mmd. The electric tar precipitator should comply with the provisions of 2.1.3.11 of this regulation, but when the electric tar precipitator is installed in front of the exhaust fan, the gas inlet pressure is allowed to be negative pressure, and the explosion relief valve may not be installed.
2.4.4 The tightness test of gas steam cooling and purification equipment is the same as that of the pipeline system, and the relevant provisions of 3.4.4 of this regulation should be followed. The suction pipe of the coke should be tested for leakage at 5×103Pa (510mmHz0), and the pressure drop in 20min should not exceed 10% to be qualified. 2.5 Production and purification of coal gas from vertical continuous carbonization furnace 2.5.1 Layout of carbonization furnace area
2.5.1.1 Newly built carbonization furnaces should be located on the upwind side of the residential area with the lowest frequency wind direction in summer. The distance between the edge of the plant and the edge of the residential area should be more than 1000m. For coal gas production less than 50000m3/h, the distance should not be less than 500m. 2.5.1.2 The longitudinal axis of the carbonization furnace should be at right angles (or close to right angles) to the wind direction with the highest frequency throughout the year. 2.5.1.3 Fire trucks should be set up around the carbonization furnace plant. The distance between the plant and the exhaust, recovery, purification and other buildings should be no less than 30m.
GB 6222-86
2.5.2 The gas cooling and purification area should comply with the provisions of 2.1.1.4 to 2.1.1.7 of this code. 2.5.3 Safety requirements for plant buildings
2.5.3.1 The fire hazard of the carbonization furnace plant belongs to Class A, and the fire resistance level of the plant is not less than Class II. 2.5.3.2 When several carbonization furnace plants are arranged in a row, the plants can be arranged adjacent to each other, but the settlement difference should be considered in the building design, and the various pipelines and cable corridors passing through them should be equipped with settlement difference compensation devices. 2.5.3.3 When using the hot coal gas from the generator for heating, the generator plant and the carbonization furnace plant can be arranged adjacent to each other. 2.5.4 Equipment structure
2.5.4.1 Equipment structure of the carbonization furnace
a. The furnace guard column and the bottom load-bearing beam of the carbonization furnace should be made of steel structure: b.
The upper part of the auxiliary coal box should be equipped with an explosion relief hole,
The shaft rod of the riser butterfly valve and the piston valve should be equipped with a heat-resistant stuffing box, which should be tightly sealed and flexible to open and close; c.
The effective height of the tar ammonia water outlet water seal of the furnace top gas main should be not less than 100mm. d.
The outlet of the gas main should be equipped with an automatic pressure regulator, which must be sensitive to operate, control the furnace top gas to be slightly positive pressure, and should be equipped with an automatic (and manual) discharge device for overpressure. Its discharge pipe should be more than 4m above the roof, f. There should be no less than 2 safety exits in the carbonization furnace plant. The width of the corridor should be no less than 1.5m, and guardrails should be installed. Protective nets should also be installed at important places to prevent tools from falling. g. Power and lighting wires should be laid in sheaths. High-pressure mercury lamps are allowed for lighting, and emergency lighting should be provided. h. The steam injection pipe at the bottom of the carbonization furnace should maintain the positive pressure of the coke discharge box. The water seal height of the coke discharge box should be greater than the pressure inside the coke discharge box, generally not less than 103Pa (102mmH,0).
i. An operating platform for pipeline cleaning should be provided at the end of the main gas pipe of the generator used for heating. 2.5.4.2 Equipment structure of coal gas cooling and purification system a. The dirty gas pipeline should be inclined toward the pumping well, and the inclination should be no less than 3%. Cleaning holes should be left at the turning point. The pipeline and the vacuum pump should be connected with metal bellows soft inlay.
b. A shock absorber should be installed between the vacuum pump outlet and the electric tar collector. The structures in the fire-forbidden area of the recovery system should be fixed with bolts, and electric welding should be avoided as much as possible. c.
Power and lighting wires in easily corroded areas must use copper core wires with anti-corrosion sleeves. d.
The equipment structure of the gas cooling, recovery and purification system shall comply with the provisions of 2.4.3.2 of this regulation. e.
2.5.5 The tightness test of the gas cooling and purification equipment and the gas pipeline from the outlet of the carbonization furnace to the exhaust fan shall comply with the provisions of 2.4.4 of this regulation.
2.6 Recovery and purification of converter gas
2.6.1 Area layout
2.6.1.1 The equipment, machine room, gas cabinet and other components of the converter gas recovery and purification system that may leak gas should be arranged on the upwind side of the minimum frequency wind direction of the main plant in summer. 2.6.1.2 The net distance between each single equipment and between them and the wall should be no less than 1m. 2.6.1.3 The gas exhaust room and the booster station building shall comply with the relevant provisions of 5.1 of this regulation. The exhaust room may be located in the main plant, but the following provisions shall be observed:
a. It shall be separated from the main plant building,
b. The exhaust gas shall be discharged outside the main plant.
2.6.2 Equipment structure
2.6.2.1 The movable or fixed hood of the converter gas shall be water-cooled, and the pressure difference inside and outside the hood shall maintain a stable micro-positive pressure. The feeding holes, oxygen guns, auxiliary gun insertion holes and silos on the hood shall be sealed and filled with nitrogen to maintain positive pressure. 2.6.2.2 The converter gas recovery facility shall be equipped with a nitrogen filling device and a continuous measurement device for the micro-oxygen content and carbon monoxide content. When the oxygen content of the gas exceeds 2% or the gas cabinet height reaches the upper limit, the recovery shall be stopped. 344
GB 6222—86
2.6.2.3 A reliable partition device shall be installed between the gas pipeline of each converter and the gas main. 2.6.2.4 The gas exhauster of the converter shall be one machine per furnace, the vent pipe shall be one per furnace, and nitrogen shall be filled intermittently. 2.6.2.5 The water supply system of the wet purification device shall be kept unobstructed to ensure that the water spray can extinguish the flame and hot dust particles of the high-temperature airflow. The dehydrator shall be equipped with an explosion-proof membrane.
For systems using semi-dry and semi-wet purification, the ash discharge device must be kept tight. 2.6.2.6 The gas recovery and purification system shall be powered by two power supplies. 2.6.2.7 The lifting and lowering of the movable smoke hood and the rotation of the converter shall be interlocked. 2.6.2.8 A direct telephone and sound and light signals shall be provided between the converter operation room and the exhaust room and the pressurizing room, and a dispatch telephone shall be provided between the pressurizing room and the gas dispatching room.
2.6.2.9 A fire-fighting road shall be provided in the converter gas recovery and purification area. 2.6.3 Tightness test of converter gas facilities The preparatory work and tightness test before the tightness test of converter gas facilities and pipelines shall comply with the relevant provisions of 3.4.4 to 3.4.6 of this Code.
3 Gas pipeline (including natural gas pipeline)
3.1 Structure and construction of gas pipeline
3.1.1 The welding, construction and acceptance of gas pipelines shall comply with the relevant provisions of this Code and the "Construction and Acceptance Specifications for Field Equipment, Industrial Pipeline Welding Projects".
3.1.2 Flanges can be used for the connection of gas pipelines and accessories, and welding shall be used as much as possible for other parts. 3.1.3 The vertical weld of the gas pipeline shall be no less than 300mm away from the edge of the support, and the horizontal weld shall be located above the support. 3.1.4 Measures to eliminate static electricity and lightning protection shall be taken for gas pipelines. 3.2 Laying of gas pipelines
3.2.1 Laying of overhead gas pipelines
3.2.1.1 Gas pipelines of industrial enterprises shall be laid overhead. If it is difficult to lay overhead, they may be laid underground, but the provisions of 3.2.2 of this regulation shall be observed.
It is strictly forbidden to lay underground pipelines for generator gas, water gas, semi-water gas, blast furnace gas and converter gas. 3.2.1.2 Overhead laying of gas pipelines shall comply with the following provisions: a: It shall be laid on non-combustible pillars or trestles, b. It shall not be laid in yards and warehouses where flammable and explosive items are stored; C. It should not pass through buildings, offices, air intakes, power distribution rooms, substations, coal crushing rooms, and poorly ventilated places where gas is not used. If it is necessary to pass through living rooms where gas is not used, casing must be installed. When overhead pipelines are laid near high-temperature heat sources and vehicles carrying hot objects often stop under the pipelines, insulation measures should be taken. d.
In cold areas, when pipelines may freeze and become blocked, anti-freezing measures should be taken: e.
f. Buildings unrelated to gas pipelines and flammable and explosive materials shall not be built under the laid gas pipelines. g. A protective net should be installed above the gas pipelines passing under the cableway. h. When the overhead gas pipelines in the area intersect with the overhead power lines, if the gas pipelines are laid under the power lines, protective nets and horizontal railings to prevent passage should be installed on the gas pipelines. The gas pipelines at the intersection must be reliably grounded. i. The inclination of the overhead gas pipeline is generally 2% to 5%. 3.2.1.3 When overhead gas pipelines are laid together with other pipelines, the following provisions shall be observed: a. When gas pipelines are laid on the same support or trestle as water pipes, heat pipes, fuel pipes and non-combustible gas pipes, the vertical clearance between them should not be less than 250mm
b. The minimum horizontal clearance between the gas pipeline and other pipelines laid on the same rack shall comply with the provisions of Table 3. 345
Other pipelines
Nominal diameter
Gas pipeline
Nominal diameter
≤300
300～600
GB 6222-86
300~600
When the gas pipeline is laid on the same rack with the pipeline that transports corrosive media, the gas pipeline should be laid on the top. For the parts that are prone to leaking gas, oil, and corrosive liquids, such as flanges and valves, protective measures should be taken on the gas pipeline. d. When laid on the same rack with oxygen and acetylene gas pipelines, the relevant provisions of the current oxygen station and acetylene station design specifications should be observed. e. The oil pipe and oxygen pipe should be laid on both sides of the gas pipeline respectively. f. The operating devices of other pipelines laid together with gas pipelines should avoid gas pipeline flanges, gate valves, flaps and other parts that are prone to gas leakage. When adding pipelines to existing gas pipelines and brackets, they must be designed and calculated, and the consent of the gas equipment management unit must be obtained. Power cables and wires should not be laid on gas pipelines and brackets, except for cables used for gas pipelines. 1. Brackets and hangers of other pipelines can be welded to the reinforcement ring or guard plate of the gas pipeline, and measures should be taken to eliminate the mutual influence of different thermal expansion of the pipeline, but they must not be welded directly on the pipe wall. j. When other pipelines are laid on gas pipelines with a diameter greater than or equal to 1200mm, a 600mm passage should be reserved above the pipeline. 3.2.1.4 The minimum horizontal clearance between overhead gas pipelines and buildings, railways, roads and other pipelines should comply with the provisions of Table 4.
3.2.1.5 The minimum vertical clearance when overhead gas pipelines intersect railways, roads, and other pipelines shall comply with the provisions of Table 5. Table 4
Minimum vertical clearance, m
Name of building or structure
General situation
House building
Railway (outside of the nearest edge track)
Road (from the road shade)
Special situation
Name of building or structure
Outer edge of overhead power line
Below 1kv
1~20ky
35~110kv
Cable pipe or trench
Other underground parallel pipelines
GB 6222—86
Continued Table 4
Melting metal, slag outlet and other fire source gas pipeline
Minimum horizontal clearance, m
·General situation
①The horizontal distance between the overhead power line and the gas pipeline should take into account the maximum wind deviation of the conductor. Note:
Special situation
It can be shortened appropriately, but thermal insulation protection measures should be taken
②Any protruding structure such as railings, walkways, operating platforms installed on the gas pipeline is considered as part of the gas pipeline. ③The water half-clearance between the overhead gas pipeline and the underground pipe or trench refers to the distance between the gas pipeline support foundation and the outer wall of the underground pipeline or trench. Table 5
Names of buildings and pipelines
"Top surface of railway tracks in the district
"Road pavement in the district
Sidewalk pavement
Overhead power lines
Voltage below V
Voltage 1~20kV
Voltage 35~110kV
Aerial ropeway (to the lowest part of the bottom of the trolley)Overhead lines of tramways
And other pipelines
Pipe diameter <300mm
Pipe diameter >300mm
Note: ①No. 1 in the table does not include railways for running electric locomotives. Minimum vertical clearance,
Under the pipeline
No installation is allowed
Same pipeline diameter
But not less than 0.1
On the pipeline
Same pipeline diameter
But not less than 0.1
GB6222-86
② The vertical clearance of the intersection of overhead power lines and gas pipelines shall take into account the maximum verticality of the conductor. 3.2.1.6 In addition to complying with the provisions of Table 5, the laying height of gas pipelines shall also comply with the following provisions: a. The clearance between the bottom of the gas transmission main pipe of a large enterprise and the ground should not be less than 6m, and the clearance between the bottom of the gas distribution main pipe of a large enterprise and the ground should not be less than 4.5m. It can be appropriately reduced in mountainous areas and small enterprises.
b. The general installation height of the newly built or rebuilt blast furnace dirty gas, semi-clean gas, and clean gas main pipes is: the clear distance from the bottom of the pipe to the ground is not less than 8m (if the partition device of the pipeline does not leak gas during operation, it can be as low as 6m), and the small blast furnace dirty gas, semi-clean gas, and clean gas main pipes can be as low as 6m,
c. The clear distance from the bottom of the pipe to the ground of the newly built coke oven cooling and purification area outdoor gas pipeline is not less than 4.5m, and the local pipe section connected to the purification equipment can be lower than 4.5m,
d. The water gas pipeline is outside the workshop, and the clearance from the bottom of the pipe to the ground is generally not less than 4.5m. When it is laid inside the workshop or under the floor of a multi-story factory building, it can be appropriately lowered, but ventilation measures must be taken and dead corners should not be formed. 3.2.1.7 The gas distribution main pipe can be installed on the outside of the factory wall or on the roof, but the following regulations should be observed: a. When laying along the outer wall or roof of a building, the building should be a Class D or E production plant with a first or second level fire resistance rating; b. The clear distance from the bottom of the gas distribution main pipe installed on the outer side of the factory wall to the ground should not be less than 4.5m, and it should be easy to inspect and repair. The clear distance from the wall: the clear distance for pipes with an outer diameter greater than or equal to 500mm is 500mm, and the clear distance for pipes with an outer diameter less than 500mm is equal to the outer diameter of the pipe, but not less than 100mm, and try to avoid blocking the window. The pipe accessories should be installed between two windows. The wall of the gas branch pipe that passes through the wall to lead into the factory building should have a circular hole and should not be close to the wall; c. When installing the distribution main pipe on the roof of the factory building, the clear distance from the bottom of the distribution main pipe to the roof surface is generally not less than 800mm. For pipes with an outer diameter of less than 500mm, when using a packing or corrugated compensator, the clear distance from the bottom of the pipe to the roof can be shortened to 500mm. In addition, the distance between the pipeline and the skylight should not be less than 2m, and it should not hinder the air circulation and lighting in the factory. 3.2.1.8 The gas pipeline in the room should be laid overhead. The gas distribution main should not be laid in the basement. If it is necessary to lay it in production, reliable protection measures should be taken.
3.2.1.9 When it is difficult to lay the gas pipeline in the factory overhead, it can be laid in the trench, and the following regulations should be observed: a. Except for the air pipeline for the same furnace, it is prohibited to lay other pipelines and cables in the trench. b. The trench cover should be a solid grate cover; the gas pipeline in the trench should avoid installation accessories, flanges, etc. as much as possible. c.
The width of the trench should be convenient for 1. Before entering the trench for inspection and maintenance, the concentration of carbon monoxide in the air should be checked; when other pipelines cross the trench, the crossing pipeline should be placed in a closed casing, and the length of the casing extending from the two walls of the trench should not be less than e.
f. Water accumulation in the trench should be prevented.
3.2.1.10 A reliable isolation device must be installed at the connection point of the upper branch pipe of the gas distribution main (except the gas pipe of the heat generator). 3.2.1.11 When the inlet of the workshop cold gas pipe is equipped with isolation devices, flow sensor elements, pressure gauge joints, sampling nozzles and vent pipes, etc., its operation The working position should be located on a platform near the workshop. 3.2.1.12 The hot gas pipeline should be equipped with an insulation layer. The length of the hot gas pipeline between the hot gas station and the farthest user should be determined according to the temperature drop and pressure drop of the gas in the pipeline, but should not exceed 80m. 3.2.1.13 The laying of the hot gas pipeline should prevent weld rupture caused by thermal stress. If necessary, the pipeline design should have automatic compensation capabilities or add pipeline compensators.
3.2.1.14 When gas pipelines of different pressures are connected, a reliable pressure regulating device must be installed. Different pressure relief pipes must be 3.2.2 Laying of underground gas pipelines
3.2.2.11. The buried depth of underground gas pipelines in industrial enterprises and the minimum horizontal and vertical clearance between buildings, structures or adjacent pipelines, as well as the safety requirements for the buried underground pipelines and the passage through ditches, shall comply with the relevant provisions of TJ28-78 "City Gas Design Code" (Trial).2.1.5 The minimum vertical clearance between overhead gas pipelines and railways, roads and other pipelines shall comply with the provisions of Table 5. Table 4
Minimum vertical clearance, m
Name of building or structure
General situation
House building
Railway (outside of the nearest edge track)
Road (from the road shade)
Special situation
Name of building or structure
Outside edge of overhead power line
Below 1kv
1~20ky
35~110kv
Cable pipe or trench
Other underground parallel pipelines
GB 6222—86
Continued Table 4
Melting metal, slag outlet and other fire source gas pipeline
Minimum horizontal clearance, m
·General situation
①The horizontal distance between the overhead power line and the gas pipeline should take into account the maximum wind deviation of the conductor. Note:
Special situation
It can be shortened appropriately, but thermal insulation protection measures should be taken
②Any protruding structure such as railings, walkways, operating platforms installed on the gas pipeline is considered as part of the gas pipeline. ③The water half-clearance between the overhead gas pipeline and the underground pipe or trench refers to the distance between the gas pipeline support foundation and the outer wall of the underground pipeline or trench. Table 5
Names of buildings and pipelines
"Top surface of railway tracks in the district
"Road pavement in the districtbzxz.net
Sidewalk pavement
Overhead power lines
Voltage below V
Voltage 1~20kV
Voltage 35~110kV
Aerial ropeway (to the lowest part of the bottom of the trolley)Overhead lines of tramways
And other pipelines
Pipe diameter <300mm
Pipe diameter >300mm
Note: ①No. 1 in the table does not include railways for running electric locomotives. Minimum vertical clearance,
Under the pipeline
No installation is allowed
Same pipeline diameter
But not less than 0.1
On the pipeline
Same pipeline diameter
But not less than 0.1
GB6222-86
② The vertical clearance of the intersection of overhead power lines and gas pipelines shall take into account the maximum verticality of the conductor. 3.2.1.6 In addition to complying with the provisions of Table 5, the laying height of gas pipelines shall also comply with the following provisions: a. The clearance between the bottom of the gas transmission main pipe of a large enterprise and the ground should not be less than 6m, and the clearance between the bottom of the gas distribution main pipe of a large enterprise and the ground should not be less than 4.5m. It can be appropriately reduced in mountainous areas and small enterprises.
b. The general installation height of the newly built or rebuilt blast furnace dirty gas, semi-clean gas, and clean gas main pipes is: the clear distance from the bottom of the pipe to the ground is not less than 8m (if the partition device of the pipeline does not leak gas during operation, it can be as low as 6m), and the small blast furnace dirty gas, semi-clean gas, and clean gas main pipes can be as low as 6m,
c. The clear distance from the bottom of the pipe to the ground of the newly built coke oven cooling and purification area outdoor gas pipeline is not less than 4.5m, and the local pipe section connected to the purification equipment can be lower than 4.5m,
d. The water gas pipeline is outside the workshop, and the clearance from the bottom of the pipe to the ground is generally not less than 4.5m. When it is laid inside the workshop or under the floor of a multi-story factory building, it can be appropriately lowered, but ventilation measures must be taken and dead corners should not be formed. 3.2.1.7 The gas distribution main pipe can be installed on the outside of the factory wall or on the roof, but the following regulations should be observed: a. When laying along the outer wall or roof of a building, the building should be a Class D or E production plant with a first or second level fire resistance rating; b. The clear distance from the bottom of the gas distribution main pipe installed on the outer side of the factory wall to the ground should not be less than 4.5m, and it should be easy to inspect and repair. The clear distance from the wall: the clear distance for pipes with an outer diameter greater than or equal to 500mm is 500mm, and the clear distance for pipes with an outer diameter less than 500mm is equal to the outer diameter of the pipe, but not less than 100mm, and try to avoid blocking the window. The pipe accessories should be installed between two windows. The wall of the gas branch pipe that passes through the wall to lead into the factory building should have a circular hole and should not be close to the wall; c. When installing the distribution main pipe on the roof of the factory building, the clear distance from the bottom of the distribution main pipe to the roof surface is generally not less than 800mm. For pipes with an outer diameter of less than 500mm, when using a packing or corrugated compensator, the clear distance from the bottom of the pipe to the roof can be shortened to 500mm. In addition, the distance between the pipeline and the skylight should not be less than 2m, and it should not hinder the air circulation and lighting in the factory. 3.2.1.8 The gas pipeline in the room should be laid overhead. The gas distribution main should not be laid in the basement. If it is necessary to lay it in production, reliable protection measures should be taken.
3.2.1.9 When it is difficult to lay the gas pipeline in the factory overhead, it can be laid in the trench, and the following regulations should be observed: a. Except for the air pipeline for the same furnace, it is prohibited to lay other pipelines and cables in the trench. b. The trench cover should be a solid grate cover; the gas pipeline in the trench should avoid installation accessories, flanges, etc. as much as possible. c.
The width of the trench should be convenient for 1. Before entering the trench for inspection and maintenance, the concentration of carbon monoxide in the air should be checked; when other pipelines cross the trench, the crossing pipeline should be placed in a closed casing, and the length of the casing extending from the two walls of the trench should not be less than e.
f. Water accumulation in the trench should be prevented.
3.2.1.10 A reliable isolation device must be installed at the connection point of the upper branch pipe of the gas distribution main (except the gas pipe of the heat generator). 3.2.1.11 When the inlet of the workshop cold gas pipe is equipped with isolation devices, flow sensor elements, pressure gauge joints, sampling nozzles and vent pipes, etc., its operation The working position should be located on a platform near the workshop. 3.2.1.12 The hot gas pipeline should be equipped with an insulation layer. The length of the hot gas pipeline between the hot gas station and the farthest user should be determined according to the temperature drop and pressure drop of the gas in the pipeline, but should not exceed 80m. 3.2.1.13 The laying of the hot gas pipeline should prevent weld rupture caused by thermal stress. If necessary, the pipeline design should have automatic compensation capabilities or add pipeline compensators.
3.2.1.14 When gas pipelines of different pressures are connected, a reliable pressure regulating device must be installed. Different pressure relief pipes must be 3.2.2 Laying of underground gas pipelines
3.2.2.11. The buried depth of underground gas pipelines in industrial enterprises and the minimum horizontal and vertical clearance between buildings, structures or adjacent pipelines, as well as the safety requirements for the buried underground pipelines and the passage through ditches, shall comply with the relevant provisions of TJ28-78 "City Gas Design Code" (Trial).2.1.5 The minimum vertical clearance between overhead gas pipelines and railways, roads and other pipelines shall comply with the provisions of Table 5. Table 4
Minimum vertical clearance, m
Name of building or structure
General situation
House building
Railway (outside of the nearest edge track)
Road (from the road shade)
Special situation
Name of building or structure
Outside edge of overhead power line
Below 1kv
1~20ky
35~110kv
Cable pipe or trench
Other underground parallel pipelines
GB 6222—86
Continued Table 4
Melting metal, slag outlet and other fire source gas pipeline
Minimum horizontal clearance, m
·General situation
①The horizontal distance between the overhead power line and the gas pipeline should take into account the maximum wind deviation of the conductor. Note:
Special situation
It can be shortened appropriately, but thermal insulation protection measures should be taken
②Any protruding structure such as railings, walkways, operating platforms installed on the gas pipeline is considered as part of the gas pipeline. ③The water half-clearance between the overhead gas pipeline and the underground pipe or trench refers to the distance between the gas pipeline support foundation and the outer wall of the underground pipeline or trench. Table 5
Names of buildings and pipelines
"Top surface of railway tracks in the district
"Road pavement in the district
Sidewalk pavement
Overhead power lines
Voltage below V
Voltage 1~20kV
Voltage 35~110kV
Aerial ropeway (to the lowest part of the bottom of the trolley)Overhead lines of tramways
And other pipelines
Pipe diameter <300mm
Pipe diameter >300mm
Note: ①No. 1 in the table does not include railways for running electric locomotives. Minimum vertical clearance,
Under the pipeline
No installation is allowed
Same pipeline diameter
But not less than 0.1
On the pipeline
Same pipeline diameter
But not less than 0.1
GB6222-86
② The vertical clearance of the intersection of overhead power lines and gas pipelines shall take into account the maximum verticality of the conductor. 3.2.1.6 In addition to complying with the provisions of Table 5, the laying height of gas pipelines shall also comply with the following provisions: a. The clearance between the bottom of the gas transmission main pipe of a large enterprise and the ground should not be less than 6m, and the clearance between the bottom of the gas distribution main pipe of a large enterprise and the ground should not be less than 4.5m. It can be appropriately reduced in mountainous areas and small enterprises.
b. The general installation height of the newly built or rebuilt blast furnace dirty gas, semi-clean gas, and clean gas main pipes is: the clear distance from the bottom of the pipe to the ground is not less than 8m (if the partition device of the pipeline does not leak gas during operation, it can be as low as 6m), and the small blast furnace dirty gas, semi-clean gas, and clean gas main pipes can be as low as 6m,
c. The clear distance from the bottom of the pipe to the ground of the newly built coke oven cooling and purification area outdoor gas pipeline is not less than 4.5m, and the local pipe section connected to the purification equipment can be lower than 4.5m,
d. The water gas pipeline is outside the workshop, and the clearance from the bottom of
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