What are the safety precautions when using canned liquefied petroleum gas? why

The following are some basic knowledge of liquefied gas that I searched online. In fact, when you use it at home, just remember to close the valve after use. Some people just like to turn off the ignition source and leave the liquefied gas valve open, which is very unsafe. If the valve is not well sealed, it is easy to leak. Liquefied gas produced by air leakage will cause fire in the air due to static electricity or fireworks. Just pay attention to these. The connection between the valve and the cooker is good. Turn on the fire after the connection, and pour cold water on the valve to see if there is a hissing sound. If there is noise, it means that the seal is not good. Connect again.

First, the basic knowledge of liquefied petroleum gas

Liquefied petroleum gas is a light component obtained from petroleum processing. It is a mixture of saturated and unsaturated hydrocarbons. Liquefied petroleum gas is flammable and explosive, so attention should be paid to prevent leakage and keep the air circulation in gas appliance.

(1) Composition of liquefied gas

The main components of liquefied petroleum gas are hydrocarbons such as propane, propylene, n-isobutane and n-isobutylene, and a small amount of impurities such as pentane and sulfide. Liquefied petroleum gas obtained by different production processes has different components.

Main characteristics of liquefied gas

(1) inflammable and explosive. Compared with gasoline and other oil and gas, the risk of fire and explosion accidents is greater. Liquefied gas reaches a certain concentration in the air, and even in cold areas, tiny sparks generated by static electricity or metal impact will quickly cause combustion. When the mixed concentration of liquefied gas and air is 2- 10%, it will cause explosion.

(2) The gas-liquid volume ratio is large and volatile: at normal temperature and pressure, liquid liquefied gas is rapidly gasified into 250-350 times the volume of liquefied gas.

(3) The specific gravity of liquid is lighter than that of water. Like oil, it floats on the water surface, and the specific gravity of the water surface is about half that of water.

(4) The specific gravity of gas is heavier than that of air, which is about 1.5 1 12 times that of air. Therefore, liquefied petroleum gas is easy to deposit in low-lying places after leakage, resulting in combustion and explosion accidents.

(5) The volume expansion coefficient is large. The volume expansion coefficient of liquefied petroleum gas at the same temperature is about 10 ~ 16 times that of water. With the increase of temperature, the volume of liquid will expand and the pressure of gas will increase. At 1 Celsius, with the increase of temperature, the volume will expand by 0.3 ~ 0.4%, and the gas pressure will increase by 0.2 ~ 0.3 MPa.

[6] Low boiling point. Generally, the boiling point is below 0℃, and it can naturally gasify in China, especially in the south, even in the coldest temperature conditions in winter.

Once low flash point. Below 28℃, the lowest combustion temperature of volatile mixed gas is called flash point, which is the precursor of fire.

(8) Corrosiveness: The corrosiveness of liquefied gas is mainly a small amount of sulfide, slightly corrosive to steel equipment and soluble to rubber.

(9) Smell: LPG has no special smell. In order to find leakage easily, additives such as ethyl mercaptan are added to liquefied petroleum gas to deodorize.

(10) Toxicity and asphyxiation: LPG has low toxicity. When the concentration of liquefied petroleum gas in the air exceeds 1%, people will vomit and feel headache. When it reaches 10%, it can anesthetize people within two minutes, and when people inhale high-concentration liquefied petroleum gas, they will suffocate and die.

Second, the purchase of liquefied petroleum gas should pay attention to related issues

(1) The cylinders of Chengdu bottled liquefied petroleum gas should have steel grade, and the angle valve should have a sealant sleeve (the sealant sleeve has the cylinder filling unit number). The gas supply device can be found by the steel number and the number on the sealing rubber sleeve. If the user buys a heavy bottle without a sealant sleeve, his legitimate rights and interests will not be protected.

(2) Regulations on Filling Weight of Liquefied Petroleum Gas (GB 1 1627-98):

Total weight of filling weight

5 kg steel cylinder 4.8 0.2 kg; ; ≥ 10.6 kg

15 Kg steel cylinder14.50.5kg; ; ≥29.8 kg

50 kg steel cylinder 49.0 1.0 kg. ≥93.0 kg

(3) Users who purchase liquefied petroleum gas only need to pay the gas fee to the supplier (the deposit payable for the cylinder is for the first time and will not be returned to the user in full with the receipt), and the supplier shall not charge unreasonable fees such as account opening fee, agency fee, cylinder wear fee and cylinder inspection fee.

Three, the use of liquefied petroleum gas related issues

1. Why can't we install liquefied gas cylinders and cookers in the bedroom?

Install liquefied petroleum gas cylinders and stoves in the bedroom. If the air leaks, it will easily lead to suffocation or fire and explosion accidents.

2. How to prevent the switch on the cooker and gas cylinder from being damaged and leaking?

To correctly master the use of the switch, always pay attention to and educate children not to play with the switch. Because of breaking the switch or forgetting to turn it off, it is easy to cause air leakage and cause fire or other accidents.

3. Why should someone be careful when using liquefied petroleum gas?

When using liquefied stone gas, we should always pay attention to the combustion situation, adjust the flame size and color, and maintain normal combustion. Avoid boiling soup to extinguish the flame, or using a small fire when the flame is blown out by the wind and the switch is not turned off, resulting in a large amount of liquefied gas leaking out, which will cause a fire or explosion accident in case of an open flame.

4. What is the cause of air leakage?

(1) The switch on the gas cylinder is not closed or the compression nut under the handwheel is not tightened;

(2) The oil-resistant hose is aged, cracked, burned or the socket is loose;

(3) The cock switch on the cooker is not tight;

(4) The hand wheel of the pressure reducing valve is not tightened or the rubber washer is lost, damaged, deformed and detached.

5. How to identify the leakage of LPG cylinders and cookers?

Every time a gas cylinder is changed or a special smell is smelled or the sealing rubber sleeve is found to be damaged, the user can smear all the joints with soapy water. If bubbles appear, it means air leakage. It is forbidden to use open flame to check air leakage.

6. What should I do if I find air leakage?

(1) If air leakage is found, first turn off the angle valve switch and open the doors and windows for ventilation. It is strictly forbidden to use all kinds of kindling, and do not switch lights or other electrical equipment at will. Please ask the professionals of the supply unit to handle it.

(2) If there is a large number of air leakage and angle valve switch failure, first of all, we must strictly prevent all kinds of kindling from approaching, and do not switch lights or other electrical equipment. In addition to calling the police immediately, try to bind it with plastic sheets and other things as soon as possible to prevent leakage, and ask the professionals of the supply unit to handle it.

7. What should I do in case of fire?

(1) If the joint of the cooker, rubber hose and pressure reducing valve leaks and the fire is not serious, just turn off the angle valve switch of the gas cylinder, which will automatically turn off under normal circumstances. If the fire is large, it can be put out with a large piece of wet cloth;

(2) If the joint between the gas cylinder and the angle valve is on fire, or the angle valve cannot be closed due to fire, or the angle valve switch fails due to fire, on the one hand, the gas cylinder should be cooled with water, and the flame should be quickly extinguished after being soaked with quilts and blankets, and then the leakage should be bandaged, and the professionals of the supply unit should be asked to deal with it as soon as possible. Send it to the supply station for processing;

(3) If there is a fire indoors, don't panic, quickly turn off the angle valve switch, unscrew the pressure reducing valve or cut the hose, and move the gas cylinder to a safe and open place outdoors. If the temperature of the bottle is high, cold water should be used to cool it, and the supplier should be informed to handle it.

8. How to deal with the residual liquid in the gas cylinder?

Due to the influence of the quality and temperature of liquefied petroleum gas, it is normal to have a small amount of residual liquid in the cylinder, so users must not handle it by themselves. Because the residual liquid is easy to volatilize after being poured out, once it is ignited, it will cause serious disaster. Therefore, the residual liquid in the bottle must be returned to the supplier for unified treatment.

9. What security checks should users conduct regularly?

(1) Before ignition, check all kinds of equipment for leakage. If there is a leak, it cannot be ignited.

(2) Before going to bed, when going out and after use, check whether the switches of gas cylinders and cookers are turned off.

(3) Before opening the angle valve, check whether the switch is turned off, so as to prevent it from being irrelevant after the last use, and then forcibly open it when using it next time, which will easily damage the angle valve and even cause an accident.

(4) Always check whether the gland hexagon nut of the gas cylinder angle valve handwheel is loose; Whether the oil-resistant hose is broken; The connection of oil-resistant pipes can be tight.

Four. Precautions for users to use LPG safely:

1, a separate kitchen with brick-concrete structure should be adopted, and liquefied petroleum gas equipment should be properly placed.

2, gas cylinders must be placed upright, are not allowed to lie flat or upside down.

3, cylinders must be far away from heat sources, placed in places that are easy to move, no flammable materials around, and well ventilated. The distance between the stove and the bottle is more than 80 cm, and it is not allowed to heat the cylinder in any form.

4. Before installing the pressure reducing valve, check the sealing rubber belt to ensure that there is no deformation or defect. The handwheel of the pressure reducing valve should be aligned with the valve port and rotated counterclockwise to tighten it.

5. Rubber hose, stove switch, pressure reducing valve and the joint between handwheel and bottle valve are easy to leak. Please check the parts with soapy water brush to check the leakage, and don't check the leakage with fire.

6. Do not dismantle or modify the special equipment for liquefied petroleum gas without permission. If you have any questions, please refer them to the supplier.

7. When liquefied petroleum gas leaks, close the bottle valve in time, open the doors and windows, and conduct ventilation and evacuation. All kinds of naked flames (including cigarette butts) are forbidden to switch on and off all kinds of electrical equipment in leakage places.

8. In case of fire, cut off the gas source (close the bottle valve) as soon as possible to avoid putting the bottle in, and call the police in time. Tel: 1 19.

9, diligent inspection, careful observation, found that the problem handled in time. To ensure safety, please close the cylinder angle valve before going to bed and when going out.

10, it is strictly prohibited to discharge the residual liquid (gas) in the steel cylinder without permission.