Preface
Production of using cryogenic oxygen, nitrogen and argon products such as oxygen station no longer
Chang popular, in which the oxygen output of ≤ 1000m3 / h of small oxygen station
In the number of occupied high proportion. In addition, the air separation of liquid products
Stations are also listed in the vaporization of small oxygen station areas, their market share is also
In the rapidly expanding.
Oxygen station in the variety of products have a certain degree of particularity. O
The chemical properties of a very lively, is a strong oxidant, can combustion, fire danger
Risk category belongs to B; nitrogen and argon are inert gases, can not be fired
Burning, but with asphyxiating, fire danger category belongs to Group E; low-temperature
Liquid product temperature below - 183 ℃, prone to frostbite personnel,
And the vaporization of expansion times up to nearly a thousand times, a result of rapid warming, etc.
Factors that lead to physical explosion. In view of the existence of the above risk factors, the National
Home as early as 1978, it promulgated the TJ 30 -78 "Oxygen Station Design Regulations
Fan, "and in 1991 its revised GB is currently being used
50030-91 "oxygen station design specification" (hereinafter referred to as: "Regulation
Fan "). For the subsequent design, construction and use of emerging security
The whole problem, the state again in 1997, issued GB 16912 -1997
"Oxygen and Related Gas Safety Technical Rules" (hereinafter referred to as: "Regulation
Way "). Mandatory standards in both countries is the current oxygen station project
The main basis for design criteria.
The last decade, on the one hand with the oxygen process technology and automation
The continuous improvement of the level of control, especially the work pressure air separation unit into a
Decline in orders of magnitude, as well as argon hydrogenation process by all the distillation hydrogen-free argon
Technology to replace, making oxygen engineering has become more simple and safe; and
On the other hand, because there are still some issues not covered by existing standards of the Department,
Or some old oxygen station not in accordance with the standard design, making a number of
Oxygen station there are some potential safety problems and irregularities of the office. Is on the pen
Who for many years in the small oxygen station encountered in engineering practice, some of
Points and difficulties as well as in the design of appropriate treatment methods and suggested a
An introduction for industry peers to discuss and reference.
The location of an oxygen station
Apart from the oxygen station siting of "norms" listed in the requirements,
Consideration should be given oxygen station their own safety, rationality and economy, etc.
A number of factors:
(1) Whenever possible, leave the layout of buildings and densely populated areas;
(2), the largest market for as close as possible or the most users;
(3) to consider other neighboring buildings, facilities and anti-oxygen station
Fire, noise and vibration spacing;
(4) taking into account the expansion, renovation of the possible;
(5) plant as much as possible towards the balance of natural ventilation, lighting;
(6) The suction outlet to clean air.
In addition, consideration should be given to the transport, electricity and water supply and other factors.
Oxygen station room and the other surrounding buildings, facilities, etc. The minimum anti -
Fire interval is as follows: station house with important public buildings and spacing of 50m;
And civil spacing of 25m; and other fire-resistant rating of 1-4
Class manufacturing buildings spaced 10 ~ 14m; or distribute fire with fire
Flower Location spacing 25m; and plants inside and outside the roads (roadside) were
5,10, and 15m; overhead cables and power poles are spaced a high degree of
115-fold.
Liquid oxygen tank and other surrounding buildings, the minimum fire safety facilities, etc.
Spacing, depending on tank capacity size of the plant compared with a slight increase in oxygen station, and the
5m within the surrounding tank should not have combustible asphalt pavement.
2 general layout of oxygen station
Oxygen station site is chosen, the region's strengths and weaknesses of the overall layout of the
Affect their daily operation has become safe, economical and rational use of
The key.
Oxygen station in general by the oxygen, the storage bag, the pressure of oxygen, the
Filling rooms and bottle filling libraries and other major production workshop and variable distribution, the cylinder inspection
Examination rooms, testing rooms, cooling water circulation system, offices, guard, and
Living facilities and other auxiliary components. In principle, the Workshop should Cloth
Set into a separate building, but considering the departure and arrival zones to limit and minimize the land
Short pipeline project can adapt to process programs are deployed in the same or if the
Dry building. If placed in the same buildings in the middle have to use fire-resistant
Burning time is not less than 115h of non-burning anti-body wall and the Class C
Separated by fire doors. Station area, the special topographical conditions, they can use ladder
Shaped the distribution of the buildings in order to reduce the workload of civil engineering.
Oxygen station as a dangerous chemical production sites, in order to avoid trespassers
Personnel access, station area should set up walls or fences, at the same time settings are not
Less than two incoming and outgoing channels.
Production plant as much as possible towards the requirements of adequate lighting, good
Natural ventilation, the general layout should take north to south. Design Shi Hai examination
Consider the main equipment, access to, the echoed among the various workshops and the cylinder for shipment
Convenience.
And oxygen-related production, storage, compression, irrigation charge and vaporization
Between the fire risk for type B, that their buildings are fire-resistant rating of not less than two
Level. Plant can be used brick-concrete structure, steel structure can be applied. At
Use of steel frame structures require fire-retardant paint coated steel columns and beams,
In which the fire resistance of steel columns coated burning time is not less than 2h, beams Tu
Fire-resistant layer burning time is not less than 115h. To the production of a
Entrance of not less than two.
To facilitate the operation and maintenance, to reduce plant construction costs, the general
Of the plant is designed to high-and low cross, which is used to place a high cross-distillation
Cold box. With the equipment, increased capacity, when the distillation column height of the cold box is too high
, It is desirable on the part of the piercing cold box will be placed outdoors, or directly near to
Place the main workshop. Arranged near to the main workshop, the Department set aside in the linked-pass
Road and to the operation of cold box placed in a separate cottage within the segment.
Taking into account equipment, routine maintenance, repair and hoisting a high degree of space
Requirements, oxygen, pressure of oxygen plant, under roof eaves height is generally 5 ~
7m. Storage bag space between the absence of maintenance requirements, can be placed in
Established within the same building analytical laboratories, libraries and other parts of the two
Floor, thereby effectively improving plant utilization. However, There shall be storage bag
Safety and fire building envelope measures, use of concrete cast in place on the second floor partitions
Board. In addition, there are some units with a fixed volume of the metal containers to take
On behalf of the storage bag, reducing the air bag covers an area of storage space, increased system
Safety, gas purity has been secured, but it will make the system
Operation to increase a certain degree of difficulty, the tower will be a lack of pressure fluctuations in
Flexibility, so the container must have a certain volume margin.
Pressure of oxygen between the oxygen compressor more than two should be a separate
Home and does not communicate directly with other rooms.
Between the size of the charge depending on irrigation equipment, production and turnover of cylinders, depending on
However, when the number of oxygen bottles over 1700 real-time, irrigation charge, there can not
Further with oxygen are located in the same building must be set up independently in a separate
A building.
General air separation plant output ≤ 180m3 / h, the filling between the loading charge
Unloading platform, using unilateral loading and unloading; output of more than 180m3 / h could be considered
Bilateral loading and unloading. When the filling has enough space between filled bottles and the real number is less than
1700, you can set the bottle is no longer a separate library.
Variable oxygen station dedicated distribution room, in the "order" in the provisions of
Class C fire rating of two production buildings, in the overall layout should be
Considered to leave the main production workshop 10m. 2 fire-resistant rating
In particular, transformation and distribution requirements should attract the attention of the Housing professional design units. When
Oxygen Station area is limited, do not allow a separate building dedicated transformer substation
Room, and for the 10kV and below the transformation and distribution room, they can side with the oxygen
Gas stations near to the construction of buildings, but it must be hole-free doors and windows firewall
Separated. Transformation and distribution room doors, windows should be set up away from the production of
Workshop.
Oxygen station cooling water circulation system are primarily designed to take into account the following
Points:
(1) tank capacity: Combining local fire station with the water distribution network
Setting the situation, taking into account the amount of water to the fire to add water reserves.
(2) Pool position setting: combination of perennial wind, taking cold water
Ikegami erected cooling tower generated Shuimo the impact on the compressor suction outlet
Ring; if the fire with water, then the fire trucks of water withdrawals should also be considered
Safety and convenience.
(3) anti-freeze design: when the cold regions should be cooled to prevent the parking
Water freezing measures.
(4) The pool water level settings: small-scale oxygen station cooling water system of large
Have adopted free-flow backwater, pond level should be able to ensure that the air separation plant to run
Backwater in the process of smooth and parking inside the pipe when the water row left to do.
(5) cooling water supply and water quality requirements.
Inter-cylinder test is not necessarily for each plant are located under the "Gas Cylinder Safety
Monitoring procedures, "the provisions of article 57 of the cylinder test unit must be approved by
Examining the qualifications of the relevant departments to obtain qualification certificates. In addition, the test
Both between the layout of the storage sites close to their bottles, but also consider the bottle
When the paint coating pollution and flammability, appropriate to its factory located at the edge
Edge, and with oxygen to maintain adequate station spacing room.
Establishment of many separate oxygen stations hope of setting up the appropriate office
Room, office room and the property of the relevant specifications are not made out
Indeed expressed. Doing general layout, if the venue allows, you can do
Public housing with the main production workshop according to 25m distance required for layout; Venues
Insufficient consideration could be given to office and production plant room adjacent to the higher side of
The wall built protective walls, but can not affect the production workshop lighting,
Ventilation and its own functions; do not possible, should not be able to establish and operate
Public housing.
Oxygen station assisted living facilities within the construction should take into account the health
Living sewage discharge and dissemination of location and production workshop sparks of fire between the
Distance. The lives of ordinary oxygen station facility failed to take effective protective measures
When facilities shall be classified as civil construction.
3 Oxygen station project pipeline design
Small oxygen station involved in the projects, including pipeline transport medium of oxygen
(LOX), nitrogen (liquid nitrogen), argon (liquid argon), nitrogen and air pollution,
Pressure distribution of the range of 0 ~ 1615MPa (G, same below) between the. Tube
Road design, based on different media, different pressure and temperature conditions into the
OK targeted selection, selection of the design.
The control of the State Council, "Special Equipment Safety Supervision Regulations" (hereinafter
Referred to as: "Ordinance") provides: oxygen station used for transmission of pressure ≥
011MPa medium gas pipelines, or flammable, explosive and the highest
Operating temperature is higher than or equal to the standard boiling point of liquid medium of the pipeline,
In the nominal diameter greater than 25mm, are pressure pipe. Needs to be complemented
Filling instructions issued by the former State Ministry of Labor "pressure pipeline safety management
And to monitor the provision "provides that:" transportation non-toxic, non-flammable, non-corrosive
Gas, their pipelines of nominal diameter less than 150mm, and maximum working
Pressure is less than 116MPa of the channel "does not belong to the pressure pipe. Now
Used in practice in the design pipeline classification is based on the "Regulations"
Requirements.
Small oxygen station design, engineering, mostly in the industrial process pipe
Pipeline industry categories. Are respectively the normal flow of media in the design process
Most commonly involved in different temperature and pressure conditions, large diameter Nominal
25mm pipe in accordance with the relevant provisions of the pressure pipe to make the following
Division:
(1) combustible media --- oxygen (GBJ 16 "Building Fire
Norms "will be classified as combustible oxygen medium): ① temperature low-pressure oxygen
Pipeline (<011MPa): If a cold box is not a low-pressure oxygen pipe
In the pressure pipe; ② room temperature low-pressure oxygen pipe (≥ 011MPa and
<110MPa): If 016MPa piped oxygen pipe for the GC3
Grade industrial pipe; ③ room temperature medium-pressure oxygen pipe (≥ 110MPa and
<410MPa): As is often the medium-pressure oxygen compressor exported for use in gas transmission pipelines
Oxygen delivery pipe for the GC2-level pressure pipe; ④ room temperature, the high -
Pressure oxygen pipe (≥ 410MPa): As is often the export of high-pressure oxygen compressor
Or the compression process design of cold box's export-led pressure for the oxygen pipe
GC1-level pressure pipe.
(2) non-combustible medium --- nitrogen, argon, nitrogen and air pollution: ①
At room temperature low-pressure gas pipeline (<011MPa): such as raw material compressor suction
Into the pipeline, out of normal process cold box product nitrogen, argon and nitrogen pollution
Gas pipelines are not part of the pressure pipe; ② room temperature low-pressure gas pipelines
(≥ 011MPa and <410MPa): As is often the small-scale air separation plants
Compressed air pipes, medium pressure compressors for the pipeline transportation of nitrogen export
Gas, argon gas pipeline for the GC3-level industrial pipe; ③ medium-pressure gas at room temperature
Body pipe (≥ 410MPa and <1010MPa): GC2-level industrial management
Road; ④ room temperature high-pressure gas pipeline (≥ 1010MPa): As is often the high -
Compressor exit pressure nitrogen, argon gas pipeline for the GC1-level industrial pipe.
(3) low-temperature liquid pipe design: low-temperature liquid pipe are
Pressure pipe.
Pipeline design must also follow the pipeline design, installation,
Inspection, testing and acceptance of such norms.
311 clear design parameters
The different requirements for different users, air separation processes and work products
Cheng matching process is different. Therefore, we must master the process special products
Points and sort out each road project pipeline process conditions, according to temperature,
Pressure and the media do a good job category, specific design.
312 pipe material selection
In order to ensure the purity of air inside the pipe network and rigor, and to consider
To the small-scale air separation equipment, process piping diameters generally smaller, construction investment
The difference is not too much, except in special circumstances, a small oxygen station project
Process design are seamless pipes used in fluid control.
Pipeline designers did engineering piping design should be in the product
Process design based on calculations or by experience-by way of analogy
Approved nominal pipe diameter and pipe wall thickness, and in accordance with the selected pipeline
The fit of the elbow, reducer fittings, tee, pipe cap, flange and support
Frame etc. tube. In addition, in order to improve product safety and disassembly,
Project pipeline should be required to install safety relief valve and the paired
Connecting flange or threaded connectors and so on.
Cryogenic liquid pipelines (including oxygen, nitrogen and argon) as
Operating temperature is low, flange, threaded connection interface such as prone to shrinkage and
Lead to leakage, it should maximize the use of welded structure, it shall be carried out
Fastening and cold pressure test.
313 toward the design of pipeline
Process design of pipeline route toward unification, taking into account a lot because
Su. In addition to follow the appropriate regulations and standards, but also must take into account their
His relevant factors including: the design, such as the shortest route, pipeline support,
Thermal expansion and contraction of the compensation, anti-vibration damping pipe, operation and maintenance inspection
Repair the convenience, reliability and aesthetics and so on. Pipeline Design unreasonable,
Will not only affect the entire security and stability in the external piping system, and even
Also interfere with the normal process operation.
314 design of the installation, inspection and acceptance requirements made
Pipeline must be designed with the pipeline installation, welding structure,
Installation of pipeline inspection and pipeline strength test, leak test
To make stringent requirements.
31411 Welding requirements
Taking into account the cleanliness of air separation products and pipeline connection strength,
Carbon Steel Pipe TIG welding demanded grounding, hand-welded cover
Cover; stainless steel pipe welding TIG; small-diameter copper wire
Ying-shun media flow structure using socket welding, welding using
BAg45CuZn silver-based solder and acetylene - oxygen flame brazing.
31412 Pipe Weld Inspection
Pipeline weld inspection shall be in accordance with the features and pressure level into the medium
Line classification. Pipe Weld strictly according to GB 50235 -1997 "Industrial Gold
Is a pipeline construction and acceptance norms "and GB 50236 -1998
"On-site equipment, industrial pipe welding construction and acceptance norms"
The provisions of visual inspection, infiltration and radiography examination.
31413 Pipeline strength test, leak test
Pipe strength and leak test after test in the weld
Carried out.
3141311 Pipe strength test
Dielectric strength test commonly used dry, clean air, nitrogen
Or clean water. Carbon Steel Pipe Road in using water as the medium of the test,
Inner wall before the trial should be carried out passivation treatment. Austenitic stainless steel pipe in
Using water as the medium of the tests require chloride ion content in water shall not be
Chao Guo 25 × 10 - 6.
(1) Ordinary piping design pressure of ≤ 016MPa, the can be used
Gas as the strength test medium, test pressure for the design of pressure
1115 times; the design pressure of> 016MPa when the intensity of water should be used
Test medium, test pressure 115 times the design pressure.
(2) oxygen pressure of ≤ 310MPa when the pipeline design, can be used
Gas as the strength test medium, test pressure for the design of pressure
1115 times; the design pressure of> 310MPa when the intensity of water should be used
Test medium, test pressure 115 times the design pressure.
(3) When on-site conditions do not permit the use of liquids or gases pressure
Strength test, after the construction unit agreement, which can use the following methods
Instead of: All welds (including weld on the attached pieces) with liquid infiltration
Penetration method or magnetic method testing; butt weld with 100% ray photo
Phase tested.
3,141,312 pipeline leak test
In the strength test carried out after passing rigorous test.
Rigorous test media commonly used dry clean air or nitrogen
Gas, the test pressure for the design pressure.
Click "order" the relevant requirements, oxygen piping tightness combined
Leakage test required holding pressure (design pressure) time of 24h, and the
Requirements "of its interior and real average hourly trench pipeline leak rate is not
More than 0125%, outdoor pipe does not exceed 015 percent. "But the combination of small
Type air separation plant oxygen station construction characteristics and the scale of volume of oxygen pipeline
Very small, any valve, flange Department's leak will make the leakage rate
Exceeded. In fact, in the case of natural ventilation trace oxygen, nitrogen and body
Leakage will not have oxygen station environment and its staff contributed to risk
Harm, the author in the design practice, make the appropriate relaxation of standards.
Hazard analysis of four oxygen station
Oxygen station belonging to dangerous chemicals production sites must hold risk
Dangerous chemical production license before being produced. Cylinder filling process is
Oxygen stations throughout the production process areas most at risk, the State Planning
Fixed cylinder filling cylinder filling is required to hold permits. Moreover, according to State
Department of State, "Special Equipment Safety Supervision Regulations," provides oxygen station in the
Pressure vessels, pressure pipelines are areas of special equipment required to set up certified
Meter, manufacture and installation.
In accordance with GB 50058 "explosion and fire of electrical installations in hazardous environments
Design specifications, "made the fire danger zone division, liquid oxygen storage and distribution areas,
Oxygen regulating valve 21 between the area of fire danger zone, irrigation oxygen station house,
Oxygen reservoir bag for the 22 inter-district fire danger zone.
Liquid oxygen storage and distribution system, in addition to oxygen outside the fire danger, but also because of
For the vaporization of liquid oxygen, after a sharp step-up, there is danger of explosion physics
Insurance, the discussion of the system beyond the general sense of the oxygen station system
Oxygen production process, This article does not specifically discussed.
At present, the small oxygen stations have been used in air separation plants and traditional
Sense of the air separation plant has a very different, with the oxygen process
Technology, a step by step increase the work pressure air separation unit is also from the previous
Of 10MPa or more dropped to about 017MPa present, fire and
Explosion risk also will be significantly reduced. So, the current oxygen station
As the production of hazardous chemicals, dangerous places Where is it? Now according to
According to make a general analysis process.
411 oxygen process
With all low-voltage technology and molecular sieve purification technology adoption, and air
Separation plant cold box has a very small possibility of an explosion, an explosion produced
The consequences are no longer as serious as the previous. The process can generate oxygen
The risk of mainly oxygen and nitrogen gases such as a large number of leaks. A
Relatively closed oxygen workshop, when the oxygen leakage, a large number of oxygen
Gas accumulated in the workshop space, Mars and other factors, such as the event trigger, will be issued
Health explosions and burning; and when a large number of leakage of nitrogen would cause vehicle
Suffocation within a staff. So, standing on the design of oxygen tend to emphasize the oxygen
Gas station ventilation.
412 storage bag
Storage bag for regulating the air separation plant and the ability to ping between the oxygen compressor
Balance. When the operator improper operation, resulting in a long time large oxygen capacity of
On the oxygen pressure when the pressure inside the storage bag will be caused by the rupture. So
In the oxygen station design be sure to set the balloon seal device, water seal height
Controlled at 150mm or so, to ensure that the airbag is not within the oxygen overpressure.
413 pressure of oxygen during
In addition to 411 referred to the danger of gas leaks, the pressure of oxygen
Process is a more hazardous process, the process inside the cylinder
Elevated temperature and pressure of oxygen at the same time, high temperature and high pressure oxygen in office
Triggered by an external factor will be an explosion and combustion, including the oxygen pressure
Machine body's own burning. In particular, is commonly used in three pressure
Shrinkage, water lubrication, 15MPa of the oxygen compressor: Compression ratio, temperature rise
High, for the protection of the safe operation of the circulating cooling water and lubrication with
Distilled water, either way the lack of water, the cylinder will cause the temperature
The sharp rise, triggering dangerous. In addition, the oxygen compressor import pipeline is located
Purchase mesh sizes ranging from 160 ~ 200μm filters and regularly
Unpick and wash and maintenance, to prevent the mechanical impurities into the pipe to avoid
Sparks during compression.
414 pressurized gasification of cryogenic liquid
Under normal circumstances, low-temperature liquid products first undergo a cryogenic liquid pump
Pressure and then to send vaporized carburetor, and then used for filling a bottle or pipe network transmission
Sent. Import pipeline compressor pumps the liquid the same as is required for import
Filters. Outlet pressure is strictly prohibited during operation exceeding the design should be
In the liquid pump outlet to set over-pressure alarm and pump shut down interlock device.
Whether it is empty type, or warm water bath-type carburetor, should be strictly controlled
System of evaporation flow, the design should be low in the carburetor exit alarm setting
And interlocking stop pump to avoid low-temperature liquids or gases into the cylinder or
Pipe network, leading to its occurrence, or the cold crisp overpressure caused by an explosion.
415 filling process
Oxygen cylinder filling station production process is the most dangerous part of the
In the country every year or even several dozens of oxygen in the base station explosion
This took place in this part. In addition to strengthening the management of gas cylinders outside, prevention
Accidents and mitigate the consequences of accident is still the primary means of
At the filling station design: gas cylinder filling speed control and reinforced concrete
Soil protective wall settings.
5 oxygen station design, some of the details
511 oxygen station fire
The fire mainly from the oxygen station fire exits, fire water supply system
And fire-fighting equipment configurations to proceed to consider several aspects.
51111 fire exits
GBJ 16 "architectural design code for fire protection," states: "B Factory
Room covers an area of more than 3000 square meters, or B covers an area of the Treasury
More than 1.5 thousand square meters, it is desirable to set fire ring channels, where
Difficulties, can be set up along its two long sides, or available for fire engines fire engines Road
Passage of not less than 6 meters and the width of the flat open space. Fire-lane wide
Degree of not less than 315 meters, the net height of not less than 4 meters "In fact, small
Plant and warehouse-type oxygen station covers an area of the above provisions are far from over
Value. Doing general layout, the right conditions the unit can be surrounded by the main
Plant layout to produce fire engines Road; difficult conditions, the production workshop
Unilateral must reserve fire engines Road. Fire Road must be able to reach consumers
Fire bolt and cooling cycle of the pool.
51112 Fire Water Supply System
Station area, the conditions surrounding the use of public fire service water supply systems have been
Oxygen station, GBJ 16 directly by the relevant provisions of the stations are located
Purchase dedicated fire hydrant. In the absence of a dedicated fire station water supply system
Area, could be considered a fire water and cooling water equipment installed at the same
A pool, and shared a water pipe system, which pools the capacity of
And pump water supply capability integrated equipment cooling water requirements and GBJ
16 with the relevant provisions to determine.
In the absence of conditions for building water supply systems in very small fire station
Area, fire-fighting water by fire engines, this time by the pool or river for Secondary
Heart of protection should not be larger than the radius of 150m.
51113 fire fighting equipment configuration
Oxygen plant fire station category C, the liquid oxygen storage tank area for the B
Class. The region, based on GBJ 140 "Building fire extinguisher configuration design rules
Fan, "provides configuration corresponding to types of fire fighting equipment.
512 oxygen station lightning protection
Oxygen station room and outdoor equipment and facilities should be GB
50057, "Lightning Protection Code for Design of Buildings," the provisions set mine facilities.
According to the standard classification, placed in an open-air liquid, gas storage tanks are
Mine construction to the second category, the impact of its lightning grounding resistance should not be large
At 10Ω; production workshop, cold boxes and other belong to the third distillation column type lightning
Construction, the impact of the lightning grounding resistance should be greater than 30Ω.
Jie Shanqi set to a different plant size and roof structures according to the
The specification will provide the design.
513 protective wall setting and filling the first few
"Normative" rule "of oxygen filling station house filling station should be located no less than a high
2m, is not less than 200mm thick reinforced concrete protective wall "did not
Provides for the protection wall of the concrete to set the form and methods. Protective wall is located
Filling should be set in order to protect staff and other personnel of the security surrounding the former
Mention. Basically, the current use "" type structure to be placed in the cylinder
Enclosed within the protective walls, while the irrigation charging device (set trachea) placed outside the
Side, sufficient irrigation hose to wear with metal walls. Operators in filling over
Process in addition to the necessary screening, are not found within the protective walls.
In addition, in order to meet the explosion-proof performance, protective wall base of a wall must be thoroughly filling
The platform below ground 500mm.
In order to prevent the filling too fast, "norms" provides that "cylinders
The inflatable speed of not more than 8m3 / h, and the filling time of less than
30min ", against this provision, the manufacturer of the filling with the first few
Generally less than normal. Oxygen filling station according to years of practice, for the common
The 40L cylinders, the filling speed is electronically limited to each cylinder filling
Not less than 30min is appropriate, too slow the economy worse.
Be pointed out that some manufacturers to meet the temporary pairs of small sporadic users
The amount of bottle filling requirements and not do the speed limit on the filling. I
Some manufacturers have repeatedly encountered in filling a bottle for less than 10min of
Situation. Filling stations vaporization is particularly acute.
It is worth mentioning that the present Filling the manufacturer of the safety valve with
Mounting height is generally low, once the over-pressure take-off, the released
Gas is very easy to hurt staff. Engineering design should be to improve the valve
Mounting height or the installation of safety valve discharge air intake airway, high office
Shorting.
514 gas pipeline trench, pipe trench with the cable channel settings
"Statute" provides that "forbidden oxygen pipe and cable laying with the trench,
And the oxygen pipe trench shall not interlinked with the cable channel. "This is because the oxygen
Heavier than air, oxygen readily accumulate on the ground trench, while the cable is sometimes
Trench due to moisture, the joint connecting adverse factors such as easy to produce sparks,
It is very likely to cause a fire. In fact, many do not do the old oxygen station
To this point, and even some of the new station areas, there are such phenomena of deposit
In, be designed to avoid such errors. As a result of limited space, there is
That may occur when the two cross-groove, can be used with concrete or sand in the oxygen
Tracheal tube or cable jacket sealing of pipe crossing the solution.
Water pipeline with gas pipelines with the ditch, when the parallel laying of the storm
Difficult when the trench will be placed in the lower pipe.
Trench bottom should be located not less than 015% of the slope, and can be
Minimum Department will discharge water.
515 explosion-proof electrical equipment
"Normative" and "procedures" stipulated that: small oxygen station in the
Liquid oxygen storage and distribution areas, the oxygen pressure regulating valve between the two groups and the oxygen filling station house, oxygen storage
Airbag each for the 21 areas and 22 district fire danger zone, the auxiliary power
Gas equipment require the use of explosion-proof electrical equipment.
A number of occasions, the relevant departments will be asked to build or even design units
Based units, including oxygen, the oxygen pressure, etc., between the whole station area
All workshop with explosion-proof electrical equipment, this is a misunderstanding. Facts
Air separation plants on the whole there are many devices themselves do not have the anti -
Burst function.
516 Environmental Protection and Occupational Safety and Health
51611 Environmental Protection
Oxygen station production process itself does not produce waste, and only a small amount of
Domestic sewage. On the oxygen station, the environmental hazards are mainly plant boundary noise
Sound. Based on GB 12348 -90 "Standard of noise at boundary of industrial enterprises",
Industrial Park plant boundary noise standard value in the daytime and night respectively, 65 and
55dB.
Oxygen station noise from three aspects: First, moving equipment operating
Generated when the noise; second pipeline gas venting noise; third
Is the loading and unloading gas cylinders or between each other when a crash with the ground. For action
In addition to the noise equipment should be concerned about the selection of equipment, the set
Count on it with the outside world should make the appropriate isolation. Small-scale air separation plant control
Road gas discharge air volume is not as and when necessary at the exit of the installation of consumer
Acoustic device can be, generally do not need to set up underground pool. In fact, the
The largest and most exciting live around the crowd noise from cylinders
Is a crash. In theory, the cylinder lightly armed light unloaded and individual equipment
Unloading, bottle suit crash, anti-vibration ring is a basic requirement, but the real
Inter-operation is often impossible. The noise produced by rough handling, environmental
Department of measurements have not, but the greatest impact on the surrounding population, it
This point has been beyond the control of non-design, there still is to strengthen the management
Li.
51612 Occupational Health and Safety
Oxygen station occupational safety and health in general in addition to attention to high concentrations of
Gas poisoning, suffocation and low-temperature liquid frostbite, workshop noise
As well as outside the conventional mechanical injury to others, there is no special, in the set
The major focus of dollars to avoid these injuries started. Require specialized proposed
Is a workshop within the channel settings, the design workshops tend to focus on the internal
The middle of the main channel, but the reality is often not the role of these pass
Road safety accidents tend to occur in the peripheral device, it must be strong
Transferred between devices set aside the space and equipment and the space between the walls. Design
As far as possible along the wall on the left the width of not less than 1m of the annular channel.
Conclusion
An oxygen station design right, reasonable or not, about an
The whole is related to the owners of the investment, related to the operator a few years or even tens of
Are convenient in operation.
1991 edition of "oxygen station design specifications," and some other professional regulatory
Fan promulgated for many years, in these years have taken place in the industry Xu
Many changes, the existing norms in many areas has been more difficult to meet the oxygen station
The requirements of design practice, the reality of the proposed modifications to the existing norms of passenger
View of requirements, but also freeing up room for amendment. I look forward to peer
Exchanges, with a view to improve together.