【 Weak current College 】 liquefied gas station, gas station fire common sense (1)

1. What is LPG?
Liquefied petroleum gas is liquefied petroleum gas, generally refers to the normal temperature and pressure is gas, but a little more pressure is likely to be the kind of liquefied petroleum gas (LPG).
2. What is liquefied petroleum gas saturation vapor pressure? temperature on liquefied petroleum gas of saturated vapor pressure??
Liquefied petroleum gas of saturated steam pressure, refers to a certain temperature, liquefied petroleum gas in closed containers reach gas-liquid two phase equilibrium State of steam pressure. LPG is saturated vapour pressure with temperature changes, temperature, vapor pressure also increases, besides LPG vapour pressure and composition, different groups have different vapour pressure. About elevated temperature every 1 ° c, steam pressure about 0.02-0.03MPa. As pure propane of saturated steam pressure at 10 ° c approximately 0.47MPa, 20℃ increase 0.83? Mpa, 50 ° c, Mpa increase 1.8?.
3, liquefied and compressed gas storage and transport safety matters?
(1) of the warehouse should be cool and ventilated to prevent the sunlight exposure, no heating. In transportation, unloading must be kept light shall not be hit. At the same time you should wear a helmet on the cylinders.
(2) cylinder contents nature of conflict between the cylinders should be divided. For example, hydrogen gas cylinders and liquid chlorine steel bottle; bottle of hydrogen and oxygen cylinders; chlorine steel bottle with liquid ammonia steel bottle, etc. shall not be placed with inventory.
(3) storage and transportation of cylinders valve should tighten, shall not be disclosed.
4, liquefied petroleum gas (LPG) flammable and explosive properties mainly in what respect?
(1) liquefied petroleum gas boiling point lower, at normal temperature and pressure of vaporization under extremely easy, 1? 250 m3 liquid can be vaporized? m3 of gas.
(2) liquefied petroleum gas, than air to be floating in the ground or in the low-lying Department deposits which are not easy to spread.
(3) of the lower explosion limit of liquefied petroleum gases, liquefied petroleum gas (LPG) when in the air concentration reaches 1.5%, it can form explosive gas.
(4) liquefied petroleum gas of ignition energy small (less than 0.4mJ), as long as there is a small spark to ignite.
(5) high resistivity of liquefied petroleum gas, high speed spray out from the container can produce more than a few kV voltage, the electric spark enough to cause ignition and explosion.
(6) liquefied petroleum gas contains sulphide, can produce corrosion container, FES powder air heat to spontaneous combustion.
5. What are the risks of LPG?
LPG is an easy expansion, easy-to-disc, easy to produce static, and other characteristics, so there is a danger of explosion of combustible, it also has the role of corrosion, anesthesia.
6, liquefied petroleum gas combustion and explosion occurred must be equipped with the basic conditions which?
LPG combustion and explosion occurred must meet three conditions: first, to a certain number of liquefied petroleum gas; second, to have sufficient air; third, to have a fire or the fire temperature reached. These three conditions must be met, and you can interact with each other. In other words, only when the liquefied petroleum gas in the air concentration reaches 1.5-9.5% range yuhuoyuan or reach the ignition temperature, combustion and explosion can occur.
7. what kind of fire can be liquefied petroleum gas ignition?
Liquefied petroleum gas belong to the level of combustible gases, ignition energy is relatively small, very small fires, such as lighted match head, burning, red wire, electrical switches out of Mars, electrostatic Sparks, friction produced by Mars, automobile exhaust pipe jetting out of Mars could be liquefied petroleum gas ignition.
8, liquefied petroleum gas (LPG) on the container has no corrosive? what are the risks?
LPG on container corrosive. As liquefied petroleum gas (LPG) contains a certain number of sulphides, sulphides with container wall surface of iron atoms occurring chemical action, generate FES, attached to the inner surface of the container, the container has a corrosive effect.
Its corrosive effect can continually make container exchanger bibian thin, lower container pressure resistance intensity, causing the vessel to form penetrating defects caused by a simultaneous generation of explosion; FES powder, will deposit on the bottom of the container. This powder such as with the residual liquid poured out, or cause the air a lot into the emptying of liquid within a container, with the oxygen in the air oxidation occurs, heat release and spontaneous combustion.
9. why LPG easily generate static? what's the harm?
Because the liquefied petroleum gas is a mixture of heavy hydrocarbons, and contain a small amount of sulfide and other impurities, resistivity is very high, so when liquefied petroleum gas from containers, high-speed Jet, and container nozzle, injector, cracked and air, producing a strong friction occurred a few kV and above voltage. According to the determination of when the voltage is greater than the 350V, its discharge can cause liquefied petroleum gas combustion and explosion.
10. why liquid LPG heating easy expansion? what harm?
Because LPG at normal temperature and pressure for gas, it is in low-temperature or high pressure conditions are compressed liquefied for liquid, stored in a pressure vessel, the nature of a contract, so easy to expand, the heat expansion coefficient greatly about water 10-16 times. Stored in the liquefied petroleum gas in cylinders, elevated temperature every 1 ° c, liquid volume will increase by about 0.3, bloating 0.4%. LPG heating easy expansion and cylinders as contact heat source or excessive loading, is extremely prone to cylinder explosion.
11, evoked LPG fire?
Liquefied petroleum gas is an extremely flammable, combustible gas explosion in the use of the main cause is the liquefied petroleum gas leakage, fire caused by combustion and explosion. Common causes are as follows: (1) for steel and pipe corrosion or connection tube rupture caused by the ageing of the liquefied gas leaks; (2) stove device failed or breakage, leakage caused by the accident; (3) cylinder filling the excess in the liquefied petroleum gas in the ambient temperature rises, the bottle liquefied dramatic expansion, causing the rupture of bottle; (4) equipped with LPG cylinder near a heat source, the steelBottle liquid petroleum gas rapidly gasification, pressure increases, up and over the cylinders allowed pressure explosion; (5) cylinder due to the impact of explosion fire; (6) angle valve, regulator, furnace switch and windshield Board failure and the oil and gas disclosure caused the accident; (7) any of the liquefied gas bottle, generate electrostatic discharge or volatile out of oil and gas event of the open fire and Burns; (8) unauthorized processing residue or filling cylinder, cause a fire and explosion.
12. why LPG the smell?
Liquefied gas itself is tasteless, because it is flammable and explosive gas, than air, not heavy 1.5 times, it is very dangerous, leak, in order to facilitate immediate discovery, joined the thiols, sulfide and other smelly substances, so that people taking place in a timely manner, to take measures to eliminate the danger.
13, the national provisions of LPG cylinders examined how long is the period?
Dissatisfaction with the period of 20 years of cylinders, each 5-year test phase at a time, use more than 20 years of cylinders examined every two years, steel has been severely corrosive or other serious damage, should be examined in advance.
14. Why can't mess down LPG residue?
LPG residue in the bottle is very difficult to vaporization combustion, but down out extremely volatile, 1 volume of residue after evaporation can generate 250-300 times more combustible gas, liquefied petroleum gas and air mixture reaches the explosion limits, encounter a fire occurs fire and explosion, LPG residue cannot give that can only be sent to the gas station to recycling.
15, liquefied gas cylinders, why can't I use horizontal drop or inverted?
Because of the lower part of the liquefied gas in cylinders is liquid, a gas. Normally, through the pressure relief valve for combustion of gaseous liquefied gas, if the horizontal drop or inverted, by reducing the liquid, the liquid after its volume rapidly expanding nearly 250 times, thus significantly exceeded the stove of load, resulting in two circumstances: first, it is highly likely to flee out of the great fire, ignite nearby combustibles; another possibility is complete combustion gases too late, the formation of explosive mixtures with air and an explosion.
16, why no liquified petroleum gas, fire roasted scalding or exposure?
Because it is also easy to cause a fire. Since the cylinder temperature exceeds its allowed temperature (-40-60 ° c), because the cylinders in the rapid expansion of liquefied petroleum gas, steel cylinders pressure is likely to exceed the burst pressure cylinder, cylinder explosion arising. At the same time, over temperature, using cylinders reduces cylinder service life, easy to make the cylinder generate local deformation, increases local pressure, on the safe use of liquefied gas cylinders have adverse factors.
17, filling liquefied petroleum gas (LPG), why don't overdose?
In filling liquefied petroleum gas, they often want to pack as much as possible, but excess filling liquefied gas will increase the risk of explosion and burning. LPG heating will expand, this is a general principle of the heat. The high and low temperature, excessive gas filling is directly related. If the cylinder capacity 15Kg overdose filling 1Kg, when temperature is above 45 ° c, there is a risk of explosion cylinders; excess filling temperature higher than 1.5Kg, at 40 ° c, cylinders or explosion; excess filling 2Kg, temperature reached 35 ° c, the cylinder also has the possibility of an explosion; excess filling 2.5Kg, only 20 ℃ temperature can cause explosion; over 3Kg, or more than, the explosion of 3Kg danger is even greater. The current widespread use of liquefied gas cylinders, filling time will not exceed 15Kg (together with cylinders in residue) in order to ensure the safety of the user.
18, liquefied gas cylinders of the storage conditions which require?
Equipped with liquid gas steel cylinder shall be kept in the room, public places, and take strict precautions against high temperature and solar radiation, the ambient temperature must not be greater than 35 ° c. Steel cylinder and stove to keep between 1m above safe distance, interior layout of other stoves prohibited (fire), ventilation should be kept well.
19, environmental temperature is higher than 60 ° c, according to stipulates quantity of filling of LPG cylinders is dangerous?
Because the liquid petroleum gas heating easy expansion, the internal cylinder is in accordance with liquid pure propane at 60 ° c to exactly fill the cylinders. According to stipulates quantity of filling the cylinder, when the temperature rises to 60 ° c, it is possible within the cylinder is filled with liquid and liquefied petroleum gas. For full of liquid steel, temperature rises 1 ℃, pressure grows 2-3Mpa. Cylinder burst pressure of about 8.0Mpa generally, at this point, as long as the temperature then rises 3-4 ° c is reached 63-64 ° c, the pressure in the cylinder can exceed the burst pressure cylinder, cylinder explosion arising. Therefore, when the ambient temperature is higher than or close to 60 ° c, shall be taken to the cylinder temperature or other measures.
20, how to deal with liquefied gas equipment leak?
If improper use of liquefied gas equipment, air leakage phenomenon occurs. When people find themselves are using liquefied petroleum gas equipment leaks, you should open the doors and Windows, natural ventilation, while artificial fan fashion to disperse the leak out of liquefied petroleum gas, and quickly close the liquefied gas cylinders, timely find leak valve parts and its causes. Locate the leak site and want to use SOAP, pumpable, batter or viscose paper for sealing. If sealing ineffective, it shall immediately notify the Fire Department and supply units. Because of the fans and the kitchen exhaust fan is not explosion-proof, if the amount of air leakage, and continues a long time, the Interior is full of easy to throw an explosive gas mixture. If you open the exhaust fan or fan, electric appliances, electrical switch in slight electrical discharge is enough to ignite the gas mixtures for Interior, a disaster will happen here.
21, liquefied petroleum gas (LPG) is extremely easy to vaporization of what harm?
Because LPG boiling point is very low, at around-42.1-0.5 degrees centigrade, at normal temperature and pressure to the gaseous state, it is in low-temperature or high pressure conditions are compressed liquefied into liquid, stored in a pressure vessel, liquefied petroleum gas at normal temperature and pressure of vaporization under extremely easy. 1? m3 liquid to vapor become 250-300? m3 of gas. LPG gas vaporization, easily than air,Therefore once the leak, it will rapidly in the ground, space and air mixture formation of large areas of explosive gases, in the event of extremely tiny spark, it will explode.
22. Why do you want to prevent air enters the liquefied petroleum gas equipment and how to prevent it?
Because the air into the container, the container and liquefied petroleum gas mix to form an explosive gas, this is very dangerous. So a new purchase or maintenance after put into use of LPG tanks, tanks, steel, etc., in filling gas before taking the inside air or with nitrogen for replacement; put to use in storage tanks, tanks, steel, etc., inside the liquefied petroleum gas is not completely empty, and there should be greater than the residual pressure, 0.05Mpa and valve closed, do not let more than gas leaks out and prevents air.
23, liquefied gas cylinder filling with required HO?
Cylinders, filling units must comply with the following provisions:
(1) the filling weight reinspection?, no Super Pack;
(2) weighing scales? should remain accurate, and the validation period of not more than three months;
(3), forbidden directly from the tank car? filling;
(4) or for new steel buildings by first filling after maintenance, you must make the vacuum Office
(5) on the stage is not checked and do not meet the requirements of the steel cylinders, is strictly prohibited and filling;
(6) after filling should be by check only, it was found out that the problem of cylinders, proper treatment; (7) fill filling records.
24, user to LPG cylinders Gallery ventilation, should pay special attention to what issues?
According to the rules, requirements, LPG cylinders library generally includes striking "non-pyrotechnic" signs and fire safety system. User-to-cylinder Gallery ventilation, should strictly comply with the Treasury's fire safety systems, no matches, lighters and other fire, smoking not allowed in the library, will be allowed to enter the library, handling cylinders should handle with care.
25, LPG storage and filling units for how to do user security use work?
LPG storage and filling units should be set the specialist is responsible for the respective user's fire prevention and safety in the use of work, and establish and improve fire safety system, often to the user information for the safe use and fire safety, to periodically check which user, help users implement fire safety precautions, gas equipment and cylinders of maintenance and inspection work, to ensure that the gas safety.