Safety technical regulations for production of oxygen and related gases by deep cooling method (1)

1 Scope
This regulation stipulates the safety requirements to be observed in the production (including design, manufacture, installation, modification and maintenance), storage, distribution and use of industrial oxygen and related gases.
This regulation is applicable to newly built, expanded and reconstructed units that use deep freezing to produce oxygen and related gases.Oxygen Compressor Company
2 normative references
The clauses in the following documents become the clauses of this standard through the reference of this standard. For dated references, all subsequent amendments (excluding errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement based on this standard to study whether the latest versions of these documents can be used . For undated references, the latest version applies to this standard.
GB/T 1527 copper and copper alloy drawn tube
GB/T 3091 Welded steel pipes for low-pressure fluid transportation
GB/T 3323 Radiography of metal fusion welding joints
GB 3096 Environmental Noise Standards for Urban Areas
GB 4053.1 Safety technical requirements for fixed steel ladders
GB 4053.2 Safety technical requirements for fixed steel inclined ladders
GB 4053.3 Safety technical requirements for fixed industrial protective railings
GB 4053. 4 Fixed industrial steel platform
GB 4962 Safety technical regulations for hydrogen use
GB 7144 Gas cylinder color mark
GB 7231 Basic identification colors, identification symbols and safety signs of industrial pipelines
GB/T 8163 seamless steel pipes for conveying fluids
GB 8958 Safety Regulations for Hypoxia Hazardous Operations
GB/T 9251 Hydrostatic test method for gas cylinders
GB 10877 Oxygen cylinder valve
GB 12135 Technical Conditions for Regular Inspection Stations of Gas Cylinders
GB/T 12137 Gas cylinder airtightness test method
GB 12348 Boundary Noise Standards for Industrial Enterprises
GB/T 12771 Stainless steel welded steel pipes for fluid transportation
GB 13004 Periodic Inspection and Evaluation of Steel Seamless Gas Cylinders
GB 14194 Permanent Gas Cylinder Filling Regulations
GB/T 14976 Stainless Steel Seamless Steel Tubes for Fluid Transmission
GB 50011 Code for Seismic Design of Buildings
GB 50016 Code for fire protection design of buildings
GB 50019 Heating ventilation and air conditioning design code
GB 50030 Specification for Design of Oxygen Station
GB 50034 Design Standards for Architectural Lighting
GB 50052 Code for Design of Power Supply and Distribution System
GB 50057 Design Code for Lightning Protection of Buildings
GB 50058 Code for Design of Electrical Installations in Explosion and Fire Hazardous Environments
GB 50140 Code for design of building fire extinguisher configuration
GB 50177 Specification for Design of Hydrogen Station
GB 50191 Code for Seismic Design of Structures
GB 50235 Code for construction and acceptance of industrial metal pipeline engineering
GB 50236 On-site equipment, industrial pipeline welding engineering construction and acceptance specifications
DL/T 5220 Technical Code for Design of 10 kV and Below Overhead Distribution Lines
HG 20202 Specifications for construction and acceptance of degreasing engineering
JB 6898 Safety rules for the use of cryogenic liquid storage and transportation equipment
SY/T 5037 Spiral submerged arc welded steel pipes for low-pressure fluid delivery pipelines
YS/T 662 copper and copper alloy extruded tube
"Gas Cylinder Safety Supervision Regulations"
"Pressure Vessel Safety Technology Supervision Regulations"
"Liquefied Gas Vehicle Tanker Safety Supervision Regulations"
3 Terms and Definitions
The following terms and definitions apply to this standard.
3.1
oxygen plant air separation plant
Within a certain area, according to different situations, there are at least a combination of oxygen generating station, oxygen filling station or oxygen compression station, outdoor process equipment and other related buildings and structures.
3.2
Oxygen station air separation station
Mainly for the layout of oxygen and other air separation product process equipment, including buildings related to the main and auxiliary production rooms.
3.3
Oxygen filling station
Mainly for arranging compression, filling and storage and delivery of oxygen and other air separation product process equipment, including buildings related to main and auxiliary production rooms.
3.4
nitrogen compressor station nitrogen compressor station
Mainly for the arrangement of process equipment for compressing and transporting nitrogen, including buildings related to main and auxiliary production rooms.
3.5
gasification station gasification station
Mainly for arranging cryogenic liquid system facilities for storage and delivery of oxygen, nitrogen, chlorine and other gases to users, including buildings related to main and auxiliary production rooms.
3.6
rare gas room
Mainly for the arrangement of rare gas purification and purification process equipment, including buildings related to main and auxiliary production rooms.
3.7
hydrogen station hydrogen station
Oxygen plants (stations, workshops) are equipped for the hydrogen production required for gas production, mainly for the arrangement of water electrolysis hydrogen production equipment, including buildings related to the main and auxiliary production rooms.
3.8
Manifold room between busbars
A building that mainly arranges busbars or gas cylinder containers or trucks for transporting oxygen, nitrogen, oxygen and other gases to users, and can also store an appropriate number of gas cylinders.
3.9
principal production shop
Oxygen production room, nitrogen production room, air storage bag room, storage tank room (area), cryogenic liquid storage tank room (area), purification room, compressor room, oxygen filling station room, bus bar room, vaporizer room, valves Operation room, air separation unit, main control room, rare gas room, hydrogen station, nitrogen pressure station, etc.
3.10
auxiliary production shop auxiliary production shop
Maintenance room, processing room, laboratory room, power transformation and distribution room, gas cylinder inspection room, water pump room, water treatment facility, warehouse, garage, etc.
3.11
air separation unit air separation unit
It is a general term for collecting equipment such as fine towers, heat exchangers, adsorbers, cryogenic liquid pumps, etc. in a cold box, including various valves, instruments, etc.
3.12
Self-cleaning self-cleaning
The carbon dioxide and moisture in the air are frozen on the surface of the reversible heat exchanger (cooler), and the frozen carbon dioxide and moisture are blown out of the equipment by the return gas in the next cycle. It includes two stages of freezing and clearing.
3.13
Air purification device air purifying equipment
All kinds of filters, adsorbers, scrubbers, reversible heat exchangers and other devices to remove mechanical impurities, moisture, carbon dioxide, ethane, mechanical oil and other hydrocarbons in the air.
3.14
Oxygen regulating valve group valve group for oxygen regulating
According to the needs of the process, adjust the oxygen pressure or flow, including pneumatic or electric control valves, and the combination of front, back, bypass valves and instrument control systems.
3.15
Oxygen (nitrogen^argon etc) filling bench
Filling oxygen (nitrogen, gas, etc.) gas, including a complete set of facilities such as filling joints (fixtures), fixture hoisting devices, gas-water separators, filling pipes, valves, anti-falling chains for gas cylinders, pressure gauges, and safety valves .
3. 16
Nitrogen fire extinguishing system for oxygen compressor
It is matched with the turbine oxygen compressor, including fusible probes or temperature probes, suction and exhaust temperature monitoring at all levels, pressure reducing valves, pressure monitoring, pressure nitrogen pipelines, quick opening valves, etc. Nitrogen-filled fire extinguishing system inside the flat oxygen compressor.
3. 17
Collecting and distributing control system Collecting and distributing control system
Realized by microcomputer, centralized management display, centralized and decentralized (local) control system.
3. 18
relative gases
Nitrogen, oxygen, noble gases, hydrogen, etc. associated with oxygen production.
3. 19
oxygen use application of oxygen
Oxygen in steel cylinders, pipeline oxygen and liquid oxygen are used as gas sources.
3. 20
cryogenic liquid cryogenic liquid
Liquid oxygen, liquid nitrogen, liquid chlorine, liquid air, etc.
3.21
Airdrop test imitative start
Before starting the main engine, disconnect the power supply, simulate starting according to the normal starting procedure, check the starting conditions and the test of the protective device.
3. 22
air precooling system air precooling system
Before the raw air enters the air separation unit or molecular sieve adsorber, it is pre-cooled to reduce the temperature and water content, including air cooling towers, nitrogen water cooling towers, refrigeration units, water pumps, valves, automatic adjustment systems, etc.
3.23
Chlorine with hydrogen/chlorine without hydrogen argon purification with hydrogen/ argon purification without hydrogen
The gas production method in which crude oxygen containing oxygen is removed by hydrogenation combustion is called hydrogen gas production.
The gas production method in which the oxygen contained in the gas is separated and removed by the whole process is called hydrogen-free chlorine production (also known as the full process gas extraction) because it does not require hydrogenation and deoxygenation.
3. 24
External compression process (oxygen) / internal compression process (oxygen) external compression process (oxygen) / internal compression process (oxygen)
The low-pressure oxygen coming out of the cold box of the air separation unit is pressurized to the pressure required by the user through the oxygen compressor, and then sent to the oxygen pipeline network and the air separation process of the user. This process is completed outside the cold box of the air separation unit, so it is called external Compression process (oxygen).
The main cooling liquid oxygen is pressurized to the pressure required by the user with the liquid oxygen pump, then it is vaporized and reheated in the main heat exchanger, and it is sent directly to the oxygen pipe network and the user after leaving the cold box of the air separation unit , the process is completed in the cold box of the air separation unit, so it is called the internal compression process (oxygen).
3. 25
Bath soaked main condenser/falling film main condenser bath soaked main condenser/down-flow film main condenser
The heat exchange unit is immersed in liquid oxygen to work, and there is a large amount of liquid oxygen stored in it. The main cooler with the height of the liquid oxygen surface is called a bath-type main cooler.
The liquid oxygen overflows from the distributor at the top of the main cooling, flows downward by gravity, forms a liquid oxygen film in the oxygen channel, does not accumulate liquid oxygen inside, and the main cooling without liquid oxygen surface height is called falling film main cooling, also known as overflow Type main cooling.
3.26
Online monitoring/offline monitoring online monitor/offline monitor
Through various detection instruments installed on the production line and equipment, continuous automatic detection of production and equipment status is called online monitoring.
Conducting necessary manual spot checks on production and equipment status through various testing instruments other than production lines and equipment is called off-line monitoring.
3.27
frequency converting startup
Reduce the power supply frequency, reduce the starting voltage, reduce the power when the device starts, and realize the smooth start of the large motor starting method.
4 basic requirements
4.1 General principles
4.1.1 In order to implement the safety production policy, prevent accidents in oxygen production, storage, transportation and use, improve working conditions, protect national property and people's life and health, and promote the development of the oxygen industry, this regulation is formulated.
4.1.2 Oxygen equipment professional manufacturers should hold the corresponding manufacturing license, and should be responsible for the quality and safety of the oxygen equipment and parts they leave the factory, and should issue safety and quality certificates and product qualification certificates, and issue installation, operation, and maintenance certificates. And other complete technical documents.
4.1.3 The designer of oxygen facilities should have corresponding design qualifications.
4.1.4 The construction, installation, and maintenance units shall perform the approval procedures for the construction and maintenance qualifications of oxygen equipment and facilities, and obtain the corresponding qualification certificates after being approved by the superior competent department. After the construction, installation and maintenance are completed, safety and quality inspection and acceptance handover should be done well. The construction unit shall construct according to the drawings. In case of any change, it shall be agreed upon by the design, construction and installation and production units, and implemented after the design unit approves in writing or issues a change document. Important changes should be reported to the superior for approval.
4.1.5 When building, expanding, or rebuilding oxygen plants (stations, workshops), the relevant national regulations on safety permits for hazardous chemical construction projects should be strictly implemented, and their safety facilities should be designed, constructed, and put into production and use at the same time as the main project.
4.1.6 Oxygen production units should select a safety evaluation agency with corresponding qualifications to conduct safety evaluation and obtain a hazardous chemical safety production license before engaging in production activities.
4.2 General plan layout
4.2.1 The selection of construction sites for oxygen production sites should conform to the overall planning of local cities and industrial areas. After technical and economic comparisons and safety assessments, select sites with good economic, social, and environmental benefits that are safe and reliable.
a) Oxygen production sites should be located in clean areas and arranged on the downwind side of the wind direction with the lowest annual frequency of harmful gas and solid dust emission sources. Consideration should be given to the possible impact on the safety of the factory when the expansion of surrounding enterprises is possible.
b) Oxygen production sites should be close to major users, and should have convenient and economical transportation conditions.
c) Oxygen production and storage sites should not be less than 200 m away from the national railway.
d) The distance between the oxygen production site and the residential area should consider the noise impact, and should comply with the relevant regulations of GB 12348 and GB 3096.
e) Oxygen production sites should have good geological conditions. Oxygen production sites should not be selected in earthquake-generating faults and earthquake areas where the peak acceleration of ground motion is greater than or equal to 0.4 g (the basic seismic intensity is greater than or equal to 9 degrees).
4.2.2 There should be a certain safe distance between the suction port of the air separation unit and the source of harmful gases such as hydrocarbons (especially Yihuan). The allowable limit content of harmful impurities in the air at the suction port shall pass the actual test and meet the requirements in Table 1.
Table 1 Permissible limit content of harmful impurities in the air at the suction port

Impurity name and molecular formula Allowable limit content
B decision c2h2 0. 5X10-6
methane ch4 5X10-6
Total CmHn 8X10—6
carbon dioxide co2 400X10T
Nitrous oxide n2o 0. 35X10—6
Note: When the content of harmful impurities in the air at the suction port exceeds the standard and cannot be avoided, targeted and effective molecular sieve adsorption and purification measures should be taken before the air separation unit.
Table 1 Permissible limit content of harmful impurities in the air at the suction port

4.2.3 The dust content in the air at the suction port of the air separation unit should not exceed 30 mg/m"
4.3 Facility category and fire distance
The production category, fire resistance level of each workshop building and structure, and the fire separation distance between the building and structure and other industrial and civil facilities shall comply with
The relevant provisions of GB 50016.

4.3.1 The production category and minimum fire resistance level of the buildings and structures of the production workshop shall meet the requirements in Table 2.
Table 2 Production category and minimum fire resistance level of each workshop facility
Name production category minimum fire rating
Main production workshop and facilities Oxygen production and pressurized oxygen plant Class B Secondary
main workshop Class D Secondary
Liquid oxygen system facility Class B Secondary
Valve chamber of oxygen regulating valve group Class B Secondary
Oxygen bottle filling room (oxygen filling station room), bus bar room Class B Secondary
Nitrogen compressor room, bottle filling room, bus bar room Class E Level three
Liquid nitrogen system facilities Class E Level 4
Oxygen compressor room, bottle filling room, bus bar room, liquid and gas system facilities Class E Level 4
Gas purification room (hydrogenation and oxygen removal process) Class A Secondary
Buildings and structures that produce and store hydrogen Class A Secondary
auxiliary
Production
workshop
Water pump house, cooling tower and water treatment facilities Class E Level 4
Boiler Room Class D Level three
Transformer and distribution substation for oxygen plant Class E Secondary
Oil-immersed transformer room Secondary
Note 1: Liquid oxygen (liquid nitrogen, liquid gas) system facilities include: liquid storage tanks, liquid pumps, vaporizers and valve rooms, etc.
Note 2: Buildings used for oxygen production, hydrogen production, pressurized oxygen, pressurized hydrogen, oxygen cylinders, oxygen cylinders, etc. should not be suspended from the ceiling.
Note 3: When the area of the oxygen compressor part of the main workshop is greater than 5% of the area of the floor or the fire compartment and the oxygen compressor is equipped with a protective wall (cover), if the area is greater than 20% of the area of the floor or the fire compartment, then The main factory building shall be fortified according to the Class B fire hazard category.
4.3.2 The fire separation distance between each building, structure and facility and a specific location shall not be less than the provisions in Table 3.
4.3.3 The fire distances of relevant facilities in the following locations are as follows:
a) The fire separation distance between oxygen (including liquid oxygen) storage tanks should not be less than the radius of the larger of the two adjacent tanks; it should be installed separately from the hydrogen storage tanks, and if they must be adjacent, the fire separation distance should not be less than the adjacent The diameter of the larger can of the two cans.
The distance between oxygen, nitrogen and gas storage tanks and the distance between nitrogen and oxygen storage tanks shall meet the construction and maintenance requirements, and shall not be less than 2 m.
The distance between the liquid oxygen storage tank and the liquid nitrogen and liquid gas storage tanks as well as the distance between the liquid nitrogen and liquid gas storage tanks shall meet the construction and maintenance requirements, and shall not be less than 2 m.
b) The fire separation distance between hydrogen storage tanks should not be less than the radius of the larger of the two adjacent tanks; the fire separation distance between fixed volume hydrogen storage tanks should not be less than 2/3 of the diameter of the larger of the two adjacent tanks; The fire separation distance between the fixed-volume hydrogen storage tank and the wet-type and dry-type hydrogen storage tanks shall not be less than the radius of the larger tank of the two adjacent tanks.
c) The oxygen regulating valve group should be equipped with an independent valve room or protective wall (the oxygen regulating valve group of the oxygen plant and station should be located outside the main factory building). Should be less than 3.5 m.
d) The fire separation distance between the oxygen buffer, the oxygen storage bag and the oxygen plant shall be determined according to the process piping and operating conditions.
4.4 General protective equipment | Oxygen Compressor Company
4.4.1 Walls or fences should be set up around the factory area.
4.4.2 Safety signs should be set up around various gas and cryogenic liquid storage tanks, and separate anti-collision fences or walls should be set up if necessary. The tank body should be color-coded.
Table 3 The minimum fire separation distance between the building, structures and facilities of the oxygen plant and specific locations, the unit is meter
specific place name Class A production workshop in the factory Buildings and structures of oxygen facilities Fire resistance rating Oxygen (or liquid oxygen) tank total volume/
m3
Hydrogen storage tank total volume/m3
, _. <1 000 1 001 〜50 000 >50 000 <1 000
General locomotive railway outside the enterprise (central line) 30 25 25 25
Electric locomotive railway outside the enterprise (central line) 20 20 20 20
General locomotive railway in the enterprise (central line) 20 20 20 20
In-house electric locomotive railway (central line) 20 15 15 15
Road outside the enterprise (roadside) 15 15 15 15
Main roads in the enterprise (roadside) 10 10 10 10
Secondary roads (curbsides) within the enterprise 5 5 5 5
overhead power line >1.5 times the pole height 1.5 times the pole height’ >1.5 times pole height >1.5 times the pole height
Outdoor substation 25 25 20 25 30 20
open flame or sparking location 30 25 20 30 35 20
civil building 25 25 18 20 25 18
important public buildings 50 50 50 50
other
structure
fire-resistant level ——Secondary 12 10 12 14 10 12 14 12
Level three 14 12 14 16 12 14 16 15
Level 4 16 14 16 18 14 16 18 20
Liquefied Petroleum Gas Storage Tank Total volume/m3 Single tank volume/m3  
30<V<50 V<20 40 18 22 27 27 32
50<V<200 V<50 45 20 25 30 30 35
200<V<500 V<100 50 22 27 35 35 40
500<V<l 000 V<200 55 25 30 40 40 45
1 000<V<2 500 V<400 65 30 40 50 50 55
2 500<V<5 000 000 75 40 50 60 60 65
V>5 000 V>1 000 100 50 60 75 75 80
Note 1: The fire separation distance shall be calculated according to the shortest distance between the outer walls, outer walls and outer edges of adjacent buildings or structures.
Note 2: When the outer wall on the higher side of two adjacent factory buildings is a fire wall, the fire separation distance is not limited, but the distance between Category A factory buildings should not be less than 4.0 mo. The external walls are all non-combustible. If there is no exposed eaves of combustible material, the sum of the area of the door and window openings on each external wall is less than or equal to 5% of the area of the external wall, and the openings of the doors and windows are not opened directly, the fire distance may be 25% reduction as specified in this table.
Note 3: Railways outside enterprises refer to non-state railways. The in-plant railway loading and unloading lines dedicated to oxygen plants (stations, workshops) are not restricted by this table.
 
specific place name Class A production workshop in the factory Buildings and structures of oxygen facilities Fire resistance rating Oxygen (or liquid oxygen) tank total volume/
m3
Hydrogen storage tank total volume/m3
一、二 <1 000 1 001 〜50 000 >50 000 <1 000
Note 7: Outdoor substations refer to outdoor substations with a power system voltage of 35 kV to 500 kV and a transformer capacity of more than 10,000 kVA, and outdoor substations with a total transformer oil volume of more than 5 t in industrial enterprises. Total step-down substation.
Note 8: The fire separation distance between the oxygen storage tank with a volume less than or equal to 50 m3 and the plant where it is used is not limited.
Note 9: The fire separation distance between the hydrogen storage tank with a volume less than or equal to 20 n? and the plant where it is used is not limited.
Note 10: Within 5 m around the liquid oxygen storage tank, there should be no combustibles and no asphalt pavement.
Note 11: Air separation units or inert gas storage tanks arranged outdoors in oxygen plants (stations, workshops) shall be Class B production buildings (air separation units) with Class I or Class II fire resistance or Class E with Class I or Class II fire resistance The production building (inert gas storage tank) determines the minimum fire separation distance between it and other buildings.
Note 12: The minimum fire distance between Class B production buildings with Class I and Class II fire resistance, such as oxygen plants (stations, workshops), and other Class A production buildings, shall be adjusted according to this table for other types of production buildings. The specified spacing is increased by 2 m0
Note 13: The fire separation distance of liquefied petroleum gas storage tanks shall be determined according to the total volume in the table or the volume of a single tank, whichever is larger.
Note 14: The minimum fire separation distance between Category B production workshop and LPG storage tank is the same as Category A production workshop.
Note 15: The buildings and structures of the oxygen facilities in this table do not include the support and pipe gallery of the oxygen pipeline.
a refers to the main production workshops and facilities in the oxygen plant.
4.4.3 The hydrogen production room and the hydrogen storage tank area should be separated from the surrounding by non-combustible solid walls with a height of not less than 2.5 m, and safety warnings should be set up

sign.
4.4.4 There should be sufficient lighting lamps for the roads in the factory area, the open-air workplace and the routes for patrolling and inspecting operating equipment, and should comply with the relevant regulations of GB 50034.
4. 4.5 The high-altitude pipeline valves in the factory area should be equipped with operating platforms, fences and straight ladders, and their specifications should comply with GB 4053. 1, GB 4053. 2,
GB 4053. 3. GB 4053.4 regulations.
4.5 Fire fighting facilities
4.5.1 According to the relevant regulations of GB 50016, the fire truck passage and fire water supply facilities should be set up in the factory. Fire water supply facilities in cold areas should have antifreeze measures. According to the requirements of GB 50140, corresponding fire extinguishing equipment of appropriate type and quantity should be equipped.
4.5.2 The fire-fighting facilities of the lubricating oil depot shall comply with the relevant provisions of GB 50016 and GB 50140.
4.5.3 An automatic fire alarm system should be installed in the protective wall of the turbine oxygen compressor.
4.5.4 Computer room, main control room, power distribution room, cable room (cable trench, cable tunnel) and other places should be equipped with automatic fire alarm system. The analysis room should be equipped with an automatic fire alarm system and an automatic detection and alarm device for combustible gas and combustion-supporting gas.
4.6 Fireproof and explosion-proof
4.6.1 Oxygen production station, oxygen injection station or oxygen pressurization station, liquid oxygen gasification station should be arranged as independent buildings, but it can be classified as "A", The production workshops of category "B" and other workshops other than open workshops such as foundry workshops, forging workshops, and heat treatment workshops are adjacently constructed, and the adjacent walls shall be protective walls without doors, windows, or holes.
4.6.2 The oxygen confluence bar room with an oxygen delivery capacity of no more than 60 m3/h may be located near the outer wall of the user’s factory building with a fire resistance rating of no less than Class III, and shall adopt a height of 2.5 m and a fire resistance rating of no less than 1.5 h. The walls and Class C fire doors are separated from other parts of the factory building.
4.6.3 The oxygen confluence room with an oxygen delivery rate exceeding 60 m3/h should be arranged as an independent building. When it is built adjacent to other user's workshops, the fire resistance rating of the adjacent workshops should not be lower than Class II, and the fire resistance rating should be adopted. The wall without doors, windows and holes for not less than 1.5 hours is separated from the factory building.
4.6.4 The oxygen busbar room can be adjacent to the gaseous ethane station or ethane busbar room for the same purpose, and be built in the same building with a fire resistance rating not lower than Class II, but it should be protected with no doors, windows or holes. The walls separate each other.
4.6.5 The filling platform of the oxygen (nitrogen, chlorine, hydrogen) filling station should be equipped with a reinforced concrete protective wall with a height of not less than 2 m and a thickness of not less than 200 mm.
4.6.6 Strictly prevent mispacking of oxygen cylinders (especially mixed hydrogen and oxygen), and strictly prohibit overfilling of gas cylinders.
4.6.7 When the reserve of oxygen cylinders is less than or equal to 1,700, the oxygen production station or liquid oxygen gasification station and the oxygen filling station can be located in the same building, but the fire resistance rating shall not be less than 1 . 5h non-combustible partition walls and Class C fire doors, and should be connected through walkways.
When medium-pressure and high-pressure oxygen storage tanks are installed in the building, the total gas storage capacity of the storage tanks and solid bottles shall not exceed 10 200
4.6.8 When the reserve of oxygen cylinders exceeds 1,700, the oxygen production station or liquid oxygen conversion station and the oxygen injection station shall be set up in two independent buildings.
In the oxygen injection station room, the storage capacity of oxygen cylinders should not exceed 3,400. When medium and high-pressure oxygen storage tanks are installed in the building, the total gas storage capacity of the storage tanks and solid cylinders should not exceed 20,400 m3.
4.6.9 Gas storage tanks and cryogenic liquid storage tanks should be arranged outdoors. When the storage tank or cryogenic liquid storage tank needs to be arranged indoors, it should be arranged in a well-ventilated separate room, and the total storage capacity of liquid oxygen should not exceed 10 m\
4.6.10 The air storage bag should be arranged in a separate room. When the total capacity of the air storage bag is less than or equal to 100 m3, it can be arranged in the oxygen production station building. The horizontal distance between the air storage bag and the equipment should not be less than 3 m, and there should be safety and fire protection measures.
The air storage bag should not be arranged directly on the top of the oxygen compressor. When it is really necessary to arrange it on the top of the oxygen compressor, there should be fire protection measures. The air storage bag should be protected from sunlight.
4.6.11 The catalytic reaction furnace using hydrogen for product purification should be installed in a separate room near the outer wall in the station building, and have good ventilation measures.
4.6.12 Hydrogen cylinders should be stored in a separate room near the outer wall of the station building, and should not be directly connected to other rooms, and ventilation holes should be provided on the top of the room. The storage capacity of hydrogen cylinders should not exceed 60 pieces. A fixed hydrogen alarm should be installed in the room.
4.6.13 Safety exits shall be provided in the oxygen compressor room, purification room, hydrogen cylinder room, storage tank room, cryogenic liquid storage tank room and busbar room.
4.6.14 There should be measures to prevent gas cylinders from dumping in the oxygen filling station room, bus bar room, empty bottle room and full bottle room.
4.6.15 The maximum reserves of independent solid oxygen cylinders or empty oxygen cylinders and solid cylinders are 13,600 for each warehouse with first and second fire resistance, and 3,400 for each protective wall; for warehouses with third fire resistance 4,500 for each seat, and 1,500 for each protective wall.
4.6.16 The main production room and oxygen confluence row room of the liquid oxygen gasification station building should be a single-story building.
4.6.17 When the oxygen production station or liquid oxygen conversion station and oxygen filling station are arranged in the same building, non-combustible partition walls and Class C fire doors with a fire resistance rating of not less than 1.5 h shall be adopted separated and connected by corridors.
4.6.18 Between rooms such as oxygen storage bag room, oxygen compressor room, oxygen filling station room, oxygen solid cylinder room, oxygen storage tank room, purification room, hydrogen cylinder room, liquid oxygen storage tank room, oxygen bus bar room, etc. , and other adjoining rooms shall be separated by non-combustible walls with a fire resistance rating of not less than 2.0 h.
4.6.19 The doors on the partition wall between the oxygen compressor room and the oxygen filling station room, as well as the purification room, oxygen storage bag room, oxygen storage tank room, liquid oxygen storage tank room and other rooms shall be of a size not lower than B Class fire doors.
4.6.20 The doors and windows of the enclosure structure of the main production rooms and busbar rooms of oxygen plants (stations, workshops), hydrogen production stations, and gasification stations should be opened outwards.
4.6.21 The electrical equipment installed in places with explosion and fire hazards shall comply with the provisions of GB 50058.
The hydrogen production room, the hydrogen compressor room, the hydrogen cylinder storehouse and the catalytic reactor part belong to the zone 1 explosion hazard zone.
Inside the protection wall of the turbine oxygen compressor, between the liquid oxygen storage and distribution area and the oxygen regulating valve group, the requirements of the fire hazard zone of Zone 21 shall be met, and the requirements of the fire hazard zone of Zone 22 shall be complied with beside the oxygen filling station and between the oxygen storage bag.
4.6.22 Non-flame-retardant cables in cable joints and cable trenches should be coated with fire-retardant paint. The cable trench is not allowed to communicate with other trenches and should be well ventilated.
4.6.23 The turbine oxygen compressor and the multi-stage centrifugal liquid oxygen pump used for transportation and distribution shall be isolated from the surrounding by a protective wall (cover).
4.6.24 It is strictly forbidden to use naked flames and electric radiators for heating in Class B production fire hazard buildings, liquefied oxygen gasification station buildings and oxygen confluence bar rooms in oxygen plants (stations and workshops).
4.6.25 The selection of measuring instruments and instruments should consider the requirements of safety, fire and explosion protection.
4.6.26 Oxygen compressors, liquid oxygen pumps, equipment in cold boxes, oxygen and liquid oxygen storage tanks, oxygen pipes and valves, instruments in contact with oxygen, machine tools, protective equipment for oxygen equipment maintenance personnel, etc., are strictly prohibited from being polluted by grease .
4.6.27 The oxygen pipeline flow rate, material, valves, accessories, installation, construction, acceptance, etc. shall be strictly implemented in accordance with the relevant provisions of Chapter 8 to avoid fire and explosion.
4.6.28 The air separation unit shall take anti-explosion measures to prevent the accumulation, concentration and blockage of acetylene and other hydrocarbons and nitrogen oxides in liquid oxygen and liquid air, causing explosion. Falling film main cooling should take more stringent anti-explosion measures.
4.6.29 When oxygen is released, fireworks are strictly prohibited near the release port. All kinds of oxygen release pipes should be led out of the room and released to a safe place.
4.6.30 Fireworks are strictly prohibited in hydrogen stations and fire ban signs are set up to prevent leakage and prevent hydrogen and oxygen mixed explosions.
4.6.31 Explosion-proof lamps should be used for lighting in hydrogen production sites, and high-efficiency light sources such as fluorescent lamps should be used as light sources. The lamps should be installed at a lower place and not directly above the source of hydrogen release.
4.6. 32 Hydrogen cylinder storage should be illuminated by waist windows sealed with double-layer glass on the outer wall.
4.6.33 The design, manufacture, installation, modification, use, maintenance and inspection of pressure vessels and pressure piping shall comply with relevant national regulations on safety management of special equipment such as the "Supervision Regulations on Safety Technology of Pressure Vessels".
4.7 Lightning protection, anti-static
4.7.1 The lightning protection and anti-static measures for various buildings and structures in the factory shall comply with the provisions of GB 50057 and GB 50058. The maximum impact grounding resistance value for lightning protection and the maximum grounding resistance value for anti-static are shown in Table 40
Table 4 Maximum grounding resistance for lightning protection and anti-static protection of various facilities in ohms
facility name Lightning protection grounding maximum impact resistance Anti-static maximum grounding resistance
Outdoor air separation unit, oxygen production room, oxygen compression room, oxygen filling station, oxygen storage tank 30
Hydrogen production room, hydrogen bottle warehouse, hydrogen bottle filling room, gas purification room, hydrogen pressure room 10
All kinds of equipment for accumulating liquid air and liquid oxygen inside and outside the air separation unit, oxygen compressor, oxygen filling station pipeline 10
Outdoor overhead oxygen pipeline 10
Indoor hydrogen production, storage and distribution system 10
Overhead Hydrogen Pipeline 10 10
Outdoor hydrogen storage and distribution system 10 10
Note: The lightning protection grounding of the outdoor air separation unit and the anti-static grounding of the main equipment in the cold box should be set separately
4.7.2 The buildings and structures of hydrogen production, storage and distribution facilities belong to the second category of lightning protection buildings and structures. The buildings and structures of oxygen production, storage and distribution system and the suction tube with a height of more than 1.5 m belong to the third category of lightning protection buildings and structures.
4.7.3 For all lightning protection and anti-static grounding devices, the grounding resistance should be tested regularly, at least once a year. The grounding device of the distributed control system shall be set separately.
4.7.4 Flange connections and threaded connections on oxygen (including liquid oxygen) and hydrogen equipment, pipelines, and valves should be bridged by metal wires, and the jumper resistance should be less than 0.03
4.8 Electrical safety
4.8.1 Power lines and cables in the factory should be laid underground. When overhead is required, the relevant regulations in Chapter 8 shall be complied with.
The power grid overhead lines of other enterprises are not allowed to pass over the oxygen plant area.
4.8.2 The power supply of the oxygen plant shall comply with the relevant provisions of GB 50052.
4.8.3 The bottom slope of the cable trench shall not be less than 0.5%, and the water collection well and drainage facilities shall be provided at the lowest point.
4.8.4 The insulation of electrical lines and equipment should be good. Safety barriers, obvious warning signs and good lighting should be set up at the exposed live conductors.
4.8.5 Metal shells of electrical equipment and devices, metal cable trays and their supports, lead-in or lead-out metal cable conduits, cable armor and cable shielding layers should be reliably grounded.
4.8.6 The power supply voltage of portable lighting fixtures shall not exceed 36 V. The voltage of lamps in metal containers and damp places must not exceed 12 V. Explosion-proof lamps should be used in places with explosion hazards.
4.8.7 In workplaces with combustion and explosive gases, explosion-proof electrical equipment should be used in accordance with the provisions of 4.6.21.
4.8.8 The main oxygen and hydrogen production workshops, machine passages, control rooms, and entrances to substation rooms should be equipped with emergency lighting.
4.9 Facility Antifreeze
4.9.1 The foundation of the air separation unit shall take anti-freezing measures according to the climate and geological conditions, groundwater level, surface water infiltration layer and other factors in different regions. It is advisable to use pearl sand concrete and other materials with fireproof and antifreeze characteristics as the foundation, and combustible substances are not allowed to replace them.
4.9.2 In the foundation of the air separation unit, it is advisable to set monitoring and temperature measurement points.
4.9.3 The equipment, containers and pipelines operating in cryogenic and low temperature should be made of low temperature resistant materials such as copper, aluminum alloy or stainless steel, and should be equipped with cold insulation layer.
4.9.4 When designing and installing pipelines for cryogenic liquids, measures should be taken to avoid accumulation of cryogenic liquids in the pipelines and before and after the valves.
4.9.5 The foundation of the powder insulation flat-bottomed cryogenic liquid storage tank should be a high table type, with a foam glass brick insulation layer, and refer to 4. 9. 2-4. 9. 4 for implementation.
4.10 Anti-earthquake and anti-vibration
4.10.1 When the buildings, structures and site of the oxygen plant (station, workshop) are selected, the anti-seismic fortification shall comply with the relevant provisions of GB 50011 and GB 50191.
4.10.2 The anti-vibration of various equipment and devices in the oxygen plant (station, workshop) shall meet the following requirements:
a) The factory area should keep a certain distance from the vibration source of periodic mechanical vibration according to the relevant provisions of the layout of the general plan;
b) The allowable amplitude values ​​of various compressors shall meet the requirements of the relevant technical regulations of the equipment;
c) Measures to prevent resonance shall be taken for the unit, auxiliary equipment and pipelines that generate vibration;
d) Reinforcement measures should be taken for the venting pipeline of the compressor.
4.11 Ventilation facilities
4.11.1 The ventilation design of the workshop shall comply with the relevant provisions of GB 50019.
4.11.2 In rooms with explosion hazards such as hydrogen production room, hydrogen press room and hydrogen cylinder warehouse, a hydrogen leak detection and alarm device should be installed, and it should be interlocked with the corresponding emergency exhaust fan. When the indoor hydrogen concentration reaches 0.4% (volume fraction), the emergency exhaust fan should be able to automatically start ventilation. During design, it shall be calculated according to the number of indoor air changes per hour is not less than 3 times, and the number of air changes per hour for emergency ventilation is not less than 12 times. Air floor type natural ventilation should be adopted.
4.11.3 The ventilation frequency of the nitrogen compressor room shall be determined according to the requirement that the oxygen content in the indoor air is not less than 19.5%, and the indoor ventilation frequency shall not be less than 3 times per hour during design, and the emergency ventilation shall be changed every hour. The gas count is not less than 7 times. An oxygen content detection and alarm device should be installed.
4.12 Paint color identification of pipelines and storage tanks
4.12.1 When designing, installing and maintaining gas and liquid pipelines, the paint color marking on the outer wall of the pipeline shall comply with the regulations in GB 7231 and Table 5.
Table 5 Color codes of various gas and liquid pipelines
Transport gas, liquid name pipe color color ring
steam big red
Air light gray
oxygen light blue
Nitrogen Nitrogen
Polluted nitrogen brown
hydrogen red White
angry silver gray
Oxygen Compressor Company