What are the problems to pay attention to before filling?

Attention should be paid to the following operation points and matters for gas cylinder filling:

1. Gas filling operators must pass the professional and technical assessment, hold the qualification certificate of gas filler, and must strictly abide by the gas filling process regulations and safety operation procedures. Before operation, check whether the filling equipment, pipelines, valves, instruments, meters, and work card equipment are complete, intact, safe, sensitive and reliable.

2. All kinds of gas cylinders, because they contain different working media and operate under pressure in various environments, their safety conditions will change, and even there will be bad changes. In order to ensure safety, regular technical inspection and evaluation of various gas cylinders in service must be carried out in strict accordance with the specified time and content. Before each gas filling, it must be confirmed that the cylinder to be filled has been inspected.

3. Strengthen the level of equipment maintenance, and the equipment cannot be positioned at the level of usability. Due to compressor quality and maintenance problems, the quality of the compressed air produced by the unit has not been up to standard for a long time. However, it has always been satisfied with the gas pressure standard, ignoring the gas quality.

The oil-water separator and dryer have not been maintained or replaced for a long time, resulting in a decrease in water removal and oil removal capacity, and an aggravation of gas cylinder corrosion, which will bury the hidden danger of accidents in the future.

4. Strengthen personnel training, organize technical backbones, especially veteran comrades with certain practical experience, summarize lessons and lessons, continuously accumulate good working methods, implement equipment operating procedures and safety systems, and avoid serious accidents caused by equipment damage or neglect of one or the other in the work caused by weak personnel technology.

5. When operating the valve, the operator must stand on its side, proceed slowly, and must open or close it tightly at one time, but it should not be too tight, so as not to produce excessive friction heat or air flow impact to produce static electricity and cause combustible gas or combustible gas cylinders to burn. If you use too much force, you can also damage the body threads.

6. From the beginning of inflation, the change of pressure should be observed at any time. When the pressure rises to 1 3 before the filling pressure, the operator should test the bottle temperature, deal with the leakage, and deal with the abnormality in time, so that the cylinder can be filled normally until the end of filling. If the existing gas cylinder is found to be not inlet (no temperature rises when touching the wall of the cylinder) or leakage during the inspection, it should be dealt with in time.

When the air is not intake, check whether the bottle valve is open; When the air leakage is done, the air leakage should be dealt with, but when the pressure exceeds 10MPa or it is not convenient to deal with, it is necessary to wait for the gas cylinder to be filled after the gas cylinder is filled, close the filling valve and the gas cylinder valve, and remove the catheter before proceeding.

First of all, the filling of air respirator cylinders (haigu) must be carried out by professionals. Before inflating, a comprehensive safety inspection should be done to ensure the safe and smooth operation of gas cylinder inflation. If the gas cylinder has the following situations, such as the mark on the gas cylinder does not meet the relevant regulations, and the gas in the gas cylinder is determined or there is no remaining pressure in the cylinder, or the gas cylinder has exceeded the inspection period, then we should first deal with it accordingly, and it is strictly forbidden to fill.

Be careful not to over-pressurize the cylinder and then cool it down to working pressure. Since humid air can corrode the inner tank of the cylinder, the gas filled into the cylinder must be clean and dry air, and it is strictly forbidden to fill any other gas or liquid. After each use, the surface of the cylinder can be scrubbed clean with a cleaning gauze dipped in water.

After the use of carbon fiber composite cylinders, a certain pressure should be retained, or gas should be filled in time to prevent toxic gases or humid air from the outside from entering the cylinders. If moist air enters the cylinder, it should be dried with dry air before aerating. When inflating the gas cylinder, it is necessary to pay attention to handling it with care, and pay attention to avoid scratches, so as to prevent the fracture of the carbon fiber and the scrapping of the cylinder.

Gas cylinders should be stored in a dry and ventilated room after each use, and it is strictly forbidden to mix them with other harmful chemicals.

The gas cylinders before filling should be inspected by a special person one by one, and the inspection content should at least include:

a Whether domestic gas cylinders are produced by a unit with a "gas cylinder manufacturing license".

b. Whether the color marking on the outer surface of the cylinder is consistent with the specified marking of the gas filled.

c. Whether the outlet thread type of the gas cylinder valve is consistent with the provisions of the gas installed: the outlet thread is left-handed for the bottle valve for combustible gas, and the outlet thread is right-handed for the bottle valve for non-flammable gas.

d Whether there is residual pressure in the cylinder. If there is residual gas, qualitative identification should be performed.

e Whether there are cracks, severe corrosion, obvious deformation and other serious external damage defects on the outer surface of the cylinder.

f Whether the cylinder is within the specified inspection period.

g Whether the safety accessories of the gas cylinder are complete and meet the safety requirements.

Gas cylinders with one of the following conditions are prohibited from being filled:

a Produced by units that do not have a "gas cylinder manufacturing license".

b The original mark does not conform to the regulations, or the steel seal mark is blurred and illegible.

c The color marking does not comply with the provisions of GB 7144 for the color marking of gas cylinders, or is severely defaced and detached, making it difficult to read.

d Marked as obsolescence.

e The inspection period has been exceeded.

f Accessories are incomplete, damaged or non-compliant.

g The material of the cylinder body or accessories is incompatible with the nature of the medium it contains.

The allowable pressure of the low-pressure liquefied gas cylinder is less than the saturated vapor pressure of the medium at the maximum operating temperature of the cylinder.

The correct filling of gas cylinders is one of the keys to ensure the safe use of gas cylinders, and improper filling, such as gas mixing and overfilling, is dangerous.

1) It is forbidden to mix gas cylinders.

Gas mixing refers to the filling of two gases or liquefied gases into the same cylinder. The most common mixed phenomenon is the mixing of combustible gases such as oxygen and combustible gases, such as gas cylinders originally filled with combustible gases (such as hydrogen, methane, etc.), which have not been replaced, cleaned and other treatments, and there is still residual gas in the bottle, which is used to fill oxygen. If the chemical reaction of these two media occurs under suitable conditions, it will cause serious accidents.

For this reason, gas mixing is never allowed.

2) It is forbidden to overfill gas cylinders.

Overloading is also a common cause of cylinder rupture**. Overfilled cylinders are affected by the ambient temperature, especially in summer, when the liquefied gas in the cylinder expands rapidly due to the heating volume, which increases the pressure in the cylinder sharply, causing the cylinder to rupture**.

In order to prevent overfilling of gas cylinders, the following work should be done. The filling work should be responsible for the special person, and the filling personnel should receive safety education and assessment on a regular basis; The filling personnel should operate carefully and shall not leave their posts without authorization, and at the same time pay attention to emptying the residual liquid and verifying the weight of the bottle. Weighing instruments used for filling liquefied gases should be calibrated at least once every 3 months, and the maximum weighing value of the weighing instruments used is multiple of the commonly used weighing value.

Press the bottle to stand and record carefully. There should be a special person responsible for repeating the weighing of filling cylinders. If the automatic metering equipment is installed, the excess can automatically alarm and cut off the valve.

Article 1 stipulates that steel seamless cylinders, steel welded cylinders, aluminum alloy seamless cylinders:

1) Gas cylinders containing nitrogen, sulfur hexafluoride, inert gas and non-corrosive high-purity gases shall be inspected once every 5 years;

2) Gas cylinders containing gases that can produce high corrosive effects on the cylinder material, diving cylinders and gas cylinders that are often in contact with seawater shall be inspected once every 2 years;

3) Gas cylinders containing other gases shall be inspected once every 3 years.

Article 1 provides for advance inspection.

In the process of use, if it is found that the gas cylinder has one of the following conditions, it shall be regularly inspected in advance;

1) There is serious corrosion, damage or doubts about its safety and reliability;

2) The winding layer of the winding gas cylinder is seriously damaged;

3) Used after the inventory or out-of-use time exceeds one inspection cycle; During the use of the gas cylinder, when it is found that there is serious corrosion, damage or doubts about its safety and reliability, it should be inspected in advance. Cylinders that are in stock and out of service for more than one inspection cycle should be inspected before they are put into use.

According to the above regulations, the gas fire extinguishing system (heptafluoropropane, IG541) is inspected once every 3 years, and the nitrogen cylinder is inspected once every 5 years. In order to ensure the safety of gas cylinders and avoid unnecessary personnel and property losses, the fire cylinder user must attach great importance to and strictly perform its statutory duties, find our company to regularly inspect and maintain the cylinders as required, and repair or replace unqualified gas cylinders in a timely manner. Ensure the safety and reliability of firefighting products.

Requirements for the Licensed Site for Gas Cylinder Filling.

Filling place. 1) According to the medium, there are gas cylinders to be inspected, unqualified areas, filling areas, and filling qualified areas, and effective isolation measures are taken;

2) It has a special site for gas cylinder loading and unloading and special loading and unloading devices, and conforms to the provisions of relevant safety technical specifications and related standards;

3) It has a special warehouse for gas cylinders, which is divided into solid bottle area and empty bottle area, and is clearly marked;

4) There shall be a clear boundary between the filling operation area and the auxiliary service area of the filling unit, and there shall also be safety warning signs and safety instructions for personnel to enter;

5) There is a working site for mobile pressure vessel inspection and loading and unloading.

First, the inspection work: the gas cylinders before filling by a special person is responsible for the inspection, one by one of the following conditions of the gas cylinders, it is forbidden to fill: 1, the gas cylinders produced by the unit without the gas cylinder manufacturing license and the imported gas cylinders approved by the safety supervision agency, as well as the gas cylinders with scrap marks; 2. The original mark does not meet the regulations, or the steel seal mark is blurred and unrecognizable; 3. The color marking on the outer surface of the gas cylinder does not conform to the provisions of the color marking of the GB 7144 gas cylinder, or the gas cylinder is seriously defaced and peeled off, and it is difficult to identify; 4. Gas cylinders that exceed the inspection period; 5. Gas cylinders with cracks, serious corrosion, obvious deformation and other serious external damage defects on the outer surface of the cylinder; 6. Gas cylinders with incomplete, damaged or non-compliant accessories; 7. Gas cylinders whose materials are incompatible with the nature of the medium contained in the cylinder body or accessories; 8. The first filling of gas cylinders or the first filling after regular inspection, without replacement or vacuum treatment; 9. The cylinder with no residual pressure in the cylinder; 10. Non-self-owned property rights or files are not in the unit of gas cylinders

The cylinder seal mark is not the gas cylinder of the unit; Gas cylinders with inconsistent steel seal marks and gas cylinder identification; Gas cylinders with grinding marks at the position of the cylinder steel seal; cylinders with duplicate or multiple stamps on the cylinder; Gas cylinders that do not have the steel stamp of the unit. 2. The gas cylinders that have passed the inspection shall be placed in the refillable area; Unqualified gas cylinders should be placed in the non-refillable area. 3. After filling, a special person should be responsible for inspecting the gas cylinders one by one.

When it does not meet the requirements, it should be properly handled, and the inspection content should comply with the following table: cylinder model filling weight and allowable deviation Bottle body, bottle valve and connection with the cylinder body Whether the cylinder is bulging and deformed The temperature of the cylinder YSP-50 49 No leakage None Normal YSP-15 No leakage None Normal YSP-10 No leakage None Normal YSP-5 No leakage None Normal YSP-2 No leakage None Normal Fourth, fill in the pre- and post-filling inspection record form. 5. Precautions 1. The re-inspection scale must be used during the calibration cycle, first calibrate the 0 position, and then carry out the re-weighing inspection bottle by bottle.

2. The treatment of unqualified gas cylinders on the blind stool: the overweight ones are sent to the residual liquid treatment post to pour back the excess part, and the underloaded ones are made up by the filling posts, and the inaccurate filling scales are adjusted in time. 3. Use soap liquid for leak detection, and if there is a leaking cylinder, it must be dealt with immediately.

After filling, there should be a special person responsible for inspecting the cylinders one by one.

Here are some common problems that gas cylinders cannot be filled in the following situations:1There are obvious physical damage such as scratches, dents and cracks on the surface of the cylinder; 2.

The cylinder has been filled with incompatible substances or contaminated; 3.The high temperature of the chain around the cylinder shed is too high or too low, and the air pressure cannot be maintained normally; 4.There is also a surplus of compressed gas or liquefied gas in the cylinder; 5.

The thread and sealing surface of the bottle valve are deformed or worn, and the sealing performance cannot be guaranteed; 6.The maximum permissible filling pressure and maximum service life of the cylinder are not indicated; 7.The cylinder expires quickly, is scrapped or has reached the age requirement.

For the above problems, the safety and stability of the cylinder will be affected, so it is necessary to carefully check before filling to ensure that the cylinder meets the use standards and safety requirements. If the above situation occurs, it must not be filled.

The contents that need to be checked in the filling of liquefied gas cylinders include:1Whether the appearance of the cylinder is visibly damaged or corroded.

2.Whether the logo of the gas cylinder is clearly visible, including the volume of the cylinder, the service life, the manufacturer and other information. 3.

Whether the valve of the gas cylinder is intact and whether there is any leakage. 4.Whether there is standing water or debris at the bottom of the cylinder.

5.Whether the weight of the cylinder meets the regulations and whether there is any leakage. The contents that need to be inspected after the filling of the liquefied gas cylinder include:

1.Whether the valve of the gas cylinder is closed and whether there is a leak. 2.

Whether the imitation circle of the gas cylinder is clearly visible, including the volume, service life, manufacturer and other information of the cylinder. 3.Whether the weight of the cylinder meets the regulations and whether there is any leakage.

4.Whether the appearance of the cylinder is visibly damaged or corroded. 5.

Whether there is water or debris in the bottom part of the cylinder.