1. Why can't acetylene cylinders be used up?
The gas in the bottle is used up, the pressure inside the bottle is balanced with the atmospheric pressure, and the air is easily mixed into the bottle to form a mixture of acetylene and air. The explosion limit of acetylene is 2.3%-100% (volume fraction). When the acetylene bottle mixed with air is sent to inflate, the high pressure acetylene is easily explosive when mixed with the air inside the bottle;
Acetylene is chemically unstable and prone to decomposition reactions. A slight energy (such as impact and vibration) causes decomposition and explosion. Even in the absence of combustion aids such as oxygen or air, pure acetylene will explode if it is pressurized above 0.2 MPa. The acetylene bottle is filled with solvent acetone. As the pressure of acetylene in the bottle decreases, the solvent taken from the bottle by acetylene gradually increases. If the acetylene is used up, the solvent loss will increase, which will bring an explosion hazard to the filling, transportation, storage and use.
2. Why can't an acetylene bottle be placed on an insulating mat?
The acetylene cylinder can be placed on the ground to remove static charge at any time. If placed on an insulating pad, static electricity cannot be removed, and accumulation to a certain extent may cause an electrostatic spark to cause an explosion.
3. Why do acetylene bottles have 2 pressure gauges?
The inlet end is a high pressure gauge, and the pressure inside the bottle is measured, and the value is large (0-4 MPa). The outlet end is a low pressure gauge that measures the pressure of the cutter hose with a small value (0-0.25 MPa). When using, first open the cylinder valve two turns, then adjust the pressure reducing valve, the low pressure gauge adjusted to about 0.03MPa is enough for the 1 cm thick steel plate to cut.
4. Why can't acetylene cylinders be inverted?
The acetylene cylinder is filled with filler and solvent acetone. When used in horizontal position, acetone is easy to flow out with acetylene, which not only increases the consumption of acetone, but also reduces the combustion temperature and affects the use. At the same time, it will cause tempering and cause the acetylene cylinder to explode.
When the acetylene cylinder is placed in a horizontal position, it is easy to roll and is impacted, resulting in a blasting accident.
Acetylene cylinders are equipped with anti-vibration rubber rings to prevent collisions during loading, unloading, transportation and use. The apron is an insulating material. The horizontal position is equivalent to placing the acetylene bottle on the insulator, so that the static electricity on the cylinder cannot spread to the earth and accumulate on the bottle body, which is easy to generate static spark. When acetylene leaks, it is easy to cause explosion. accident.
A pressure reducer, a flame arrester and a hose are connected to the acetylene cylinder bottle valve. Easy to roll due to lying, easy to damage the pressure reducer, flame arrester or pull-off hose when rolling, causing acetylene leakage, causing combustion explosion.
5. Why can't acetylene cylinders be exposed to the sun?
During gas welding and gas cutting operations, acetylene cylinders and oxygen cylinders are not allowed to be exposed to sunlight. Exposure can cause an increase in pressure inside the cylinder, which can cause the cylinder to explode.
