1, an air separation plant in the parking emission low-temperature liquids, which should pay attention to safety matters?
    A: The air separation plant in the liquid oxygen, liquid air oxygen content is high, evaporation in the air after the oxygen concentration can cause local areas to improve, if you encounter fire, burning to occur, risk of explosion. A fertilizer plant had turned out due to the large number of liquid oxygen in the trench, but also encountered in welding sparks and exploded wounding incident. Therefore, prohibited the liquid disposed of in trenches, we should be ranked by pipeline to the liquid evaporation tank or a special low temperature resistant metal emissions pit.
    Discharge pit should always be kept clean, there is organic matter or grease accumulation is strictly prohibited. In the discharge of liquid, the surrounding flare is strictly prohibited.
Cryogenic liquid and skin contact, it will cause severe frostbite. Ranging from the formation of blisters on the skin, redness, swelling, pain; emphasis on the internal organization will be damaged by frost and bone joints. If you fall into the eye, it will cause eye damage. Therefore, when the liquid discharge their hands to avoid direct contact with the liquid, if necessary, should be put on dry cotton gloves and protective glasses. If it was the skin should immediately with warm water (45 ℃ below) wash.

2, oxygen which parts most likely to explode?
     A: The oxygen plant explosion site to some extent the pattern of the air separation unit. In the high, medium voltage, dual-pressure process, a relatively high probability of explosion; production of liquid oxygen device, the main explosion occurred in the cold without, while the gas-oxygen device's main cooling the center of the explosion. Extent and explosive blast damage related to a weak explosion may only undermine the individual tubes are not even detected by the operator.
    Condenser evaporator explosion site, with its configuration is different and different. Generally prone to surface at the boundary between the liquid oxygen and liquid oxygen flow of individual poor access, but also occurs in the lower part of the tube plate on the roof Department or Office. Condensation of the auxiliary evaporator, an explosion occurred in the liquid oxygen easily finished closer to the lower evaporation.
    According to statistics, in addition to condensate evaporator, the incidents have occurred in other parts of the explosion. Include: Air Liquide imported under the tower lower part; Air Liquide adsorber; Air Liquide on the tower entrance of the tray; oxygen discharge pipe; liquid oxygen pump; switching heat exchanger cold side of the oxygen channel; auxiliary condenser evaporator after acetylene separation of vehicles.
    No matter which part of the explosion, its causes are liquid oxygen (or oxygen-enriched liquid air) the existence of, and in the process of evaporation caused by the concentration of hazardous materials, accumulation or precipitation to form an explosive mixture, under certain conditions, to promote an explosion .

3, checking the pressure pipe should pay attention to what safety matters?
     A: Pressure pipes, in the production process of the most vulnerable to the problem is that, in connection flange at the leak. Once a leak, should not go in with a pressure of tightening bolts. Because the leakage generated in the process in operation there is a certain reason, such as the gasket is damaged, pipelines subject to thermal stress and so on. At this time, tighten bolts alone can not solve the problem, often due to leakage yet to be dispelled and the energetically screw bolt, screw off until the bolt, high-pressure gas exhaust pipe, resulting in injury accidents. Several plants have already occurred due to the place with pressure screw bolts bolt broken flange casualties flying lessons.
    Therefore, we must strictly not allowed to bring pressure to comply with the provisions of screw bolts can not be in order to race against time, remove tasks have chances in violation of operation rules.

4, in the maintenance of air separation equipment for welding flare should pay attention to what question?
   A: When the oxygen machine shut down for maintenance, the need for welding flare up, should pay attention to the following questions:
    1) oxygen production workshop, such as is needed to fire, should be approved by superiors, and testing the oxygen concentration around the site to enhance fire safety measures. When the welding places is higher than 23% oxygen concentration, can not be welded. On oxygen concentrations below 19% when you want to prevent choking accidents;
    2) there is pressure on the container, without relief can not be pre-welding;
    3) without a complete low-temperature heating container, Freeze fire repair, in order to avoid excessive thermal stress or can not guarantee welding quality. Severe cases, if liquid oxygen, gas and oxygen escape, but also may cause a fire;
    4) The flare up of the whole process of the security guards should have custody.

5, in contact with oxygen, which should pay attention to security issues?
Answer: Oxygen is a colorless, odorless, tasteless gas. It is a combustion-supporting agent. With flammable gas (acetylene, methane, etc.) to a certain percentage of mixing can form explosive mixtures. When the oxygen concentration in the air increased to 25%, has been able to arouse a lively combustion reaction; oxygen concentration reached 27%, there can be developed into a Mars lively flames. Therefore, oxygen and oxygen equipment around the plant should be strictly prohibited fireworks. When the clothes were oxygen saturation, the experience that is rapidly burning fire. In particular, contaminated fat clothes. Case of oxygen may be spontaneous. Therefore, the oxygen saturation of clothes to the outdoor ventilation should be immediately diluted. Meanwhile, the oxygen machine operator or direct contact with oxygen, liquid oxygen people are not allowed to wipe pomade.

6, in contact with nitrogen, which should pay attention to security issues?
      Answer: Nitrogen is a colorless, tasteless, odorless inert gas. Its own little harm to humans, but in the air when the nitrogen content increased, which reduces the oxygen content, causes respiratory difficulty. If the inhalation of pure nitrogen, it will due to severe asphyxia, suffocation and even death.
The workshop in order to avoid an increase in nitrogen content in the air may not be within the air separation unit to separate the nitrogen emissions from indoors. In the presence of a large number of nitrogen, oxygen breathing apparatus should be worn. Maintenance nitrogen-filled equipment, containers and pipelines, must first use of air displacement, analysis of oxygen content in the rear to allow qualified jobs. In the overhaul should be some monitoring, strict supervision of the valve on the nitrogen to prevent the wrong place to open the valve and personal accident.

7, ammonia any harm to human body contact with what issues should pay attention to?
   Answer: Ammonia is a colorless, there are stimulating odor. Ammonia splashed into eyes, the conjunctival enable the rapid hyperemia, edema, there is a sense of pain, and corneal opacity will happen, or even blindness. Rinse immediately with plenty of water (not less than 15min), and as soon as possible treatment.
    Ammonia or a high concentration of ammonia in contact with skin can cause burns, there erythema, blisters, until necrosis. After the skin by ammonia burns, first wash with plenty of water for more than 15min, and then wash affected area with 2% acetic acid, 5% boric acid can also be used wet compress.
    Inhalation of ammonia can cause poisoning. Mucosa and nasal symptoms of eye irritation, tearing, sneezing, chest, depression, cough, also cause stomach pain. Severe cases may cause swelling of the lungs and even death. In each 1L of air containing ammonia 1.5mg / L, that is danger of poisoning; containing 3mg / L, the stay 5 ~ 6min to death. Generally allowed a concentration of 0.03mg / L. Cases of poisoning should promptly from the scene and taken to the place where the air is fresh, or treatment.
Exposure to ammonia should be wearing rubber gloves and wet multi-layer protective masks, large concentrations of oxygen when the need to wear gas masks or respirators. In case of emergency treatment ammonia leak failure, respiratory tract can be used wet towel placed over left the scene as soon as possible.

8, noise on the human body any harm. How to eliminate the noise?
    A: The noise is multi-tonal components with irregular complex sound, the harm to human body is mainly damage hearing. The intensity of the sound of "decibels" (dB) for the units of measurement. If you long for more than 100dB of noise conditions (on the high-frequency noise is 80 ~ 90dB), can cause hearing damage. Of noise on the body's nervous and cardiovascular systems also can have adverse effects.
Therefore, the current regulations to allow the noise in the workplace should not exceed 90dB.
    Oxygen station noise mainly from high-speed operation of the compressor and gas discharge. The noise spectrum characteristics and the type and speed of the compressor, piping, valves and opening degree of the structural type, gas emissions, pressure and flow rate and other factors.
    Noise reduction method is through a sound-absorbing material (glass wool, foam sound-absorbing tiles and microporous, etc.) sound-absorbing, its high frequency noise silencer significant role; the other is the interference, change the sound propagation direction, It is more effective low-frequency noise. At present, the gas discharge, each equipped with a muffler or a silencer hole. Pairs of screw compressor, in the smoke, exhaust port is also equipped with a silencer.
In order to reduce operating noise field intensity of the turbine air compressor piping bag with insulation material may be, or to the entire compressor enclosures, or a separate air compressor noise operation of the control room set up, through the double-glazed observation of the functioning of to conduct periodic inspection tour between machines.

9, oxygen workshop on how to rescue a fire?
   A: The cause of the fire caused a lot of, there is oil on fire, fire and other electrical equipment. There is a lot of oxygen for combustion plant matter (oxygen and liquid oxygen), with a greater risk. Fire-fighting using a fire extinguisher, sand, water, nitrogen and so on. Fire different ways in different fire-fighting equipment should be used. Should first distinguish between objects and never indiscriminate use, so as to avoid danger.
    When the density of water is small, and does not dissolve in water, liquid or oil fire, if the water to the fire, the fire district would become wider. Should be sand, steam or foam fire extinguishers to fight, or the method used to partition off the air.
    Electrical equipment on fire, people should not use foam fire extinguisher, it is not water to the fire, fire extinguisher is required by CTC. Because water and foam have electrical conductivity, it may cause fire by an electric shock. Wires on fire, they would first cut off the power, then use the sand to fight.
    General solid-fire can be used to put sand or water.
    Oxygen pipeline fire, then first of all to cut off gas supply.
    Wearing clothes on fire, can not swat, fire blankets should be wrapped around the body in the ground and from the roll.
Dangerous part in the workshop can be prepared in advance or set up some bottles of nitrogen nitrogen piping for fire fighting.

10, in contact with electrical equipment, it should pay attention to these matters?
   A: The use of electrical equipment, the main danger of electric shocks and electrical injuries occurred. The so-called shock, that is, when an electric current through the body the body can suffer; only a partial injury to the body known as the electrical injury. The most dangerous is the electric shocks.
    Current human injury: burns the human body, destruction of tissues, causing blood and other organic materials such as electrolysis and stimulate the nervous system.
    Current degree of harm of the current intensity through the human body, the role of time and the body's own circumstances and other factors. Facts have proved that the current through the human body is necessary in 0.05A above dangerous; 0.1A above can cause death. The longer the shock, the greater the degree of risk. If an electric shock when the current of 0.015A, the person who is not easy from the power supply.
    The human body has some resistance, particularly in the resistance of the skin more. In each 1cm2 surface contact resistance between about 1000 ~ 180000Ω. Moisture in the skin when the resistance will be significantly reduced. If the resistance of the smaller, in a certain voltage current through the greater, the greater the risk. Generally speaking, when the voltage is below 45V, the current even if the body is safe.
Therefore, the security voltage (such as security lights) should be below 45V.
    The major causes of electric shock accident occurred:
    1) The damaged equipment (such as motors, wires, electrical switches, etc.) on the operation;
    2) contact with live wires of bare wire, or worn;
    3) There is no grounding device or earthing bad;
    4) The lack of the necessary protective equipment.
    The safe use of electrical equipment, in addition to strictly implement the safety technical regulations, we must also observe the following basic safety knowledge:
    1) The outside of the insulated wire, if damaged, will not be used, must be insulated wrap;
    2) To carry out regular checks of all electrical equipment grounding device is disengaged;
    3) push, pull electrical switch must act quickly, the face should be out of the way, and should wear the necessary protective equipment;
    4) Check the motor case temperature, suitably back of the hand contact with shell, is not available palm contact, to avoid being de-power is inseparable from the Xi Zhu;
    5) persons not familiar with electrical equipment can not be tamper with, or unauthorized repair equipment;
    6) removal of electrical equipment shall not wash with water or wipe with a damp cloth;
7) In the electric switch should be placed before a 10mm thick rubber insulation board.

11, why is the oxygen required to wear work clothes of cotton fabric?
   A: The oxygen industry, like other types of workers, as in production must wear clothes. However, oxygen workers are special requirements: You can only wear cotton fabric clothing. Why is this? Oxygen production site due to unavoidable exposure to high concentrations of oxygen, which is from a safety point of view of production requirements. Because
    1) Synthetic fabric in friction will produce static electricity, sparks easily. In clothing, the clothing off when the chemical fiber fabrics, producing up to several thousand volts of static-bit or even more than ten thousand volts. When the clothing is full of oxygen is very dangerous. For example, when oxygen in the air increased to 30%, the chemical fiber fabrics only 3s will be able to light-off time.
    2) When you reach a certain temperature, chemical fiber fabrics began to soften. When the temperature exceeds 200 ℃, it will melt and was viscous flow state. The event of combustion, explosion, chemical fiber fabric may be due to the role of high-temperature adhesive on the skin can not take off, it will cause serious injury.
    Cotton clothes do not have the above-mentioned shortcomings, therefore, from a security point of view, workers in overalls on the oxygen should be specific requirements. Meanwhile, the oxygen chemical fiber industry itself does not wear underwear fabric.