What should we pay attention to when using high purity helium?
High purity helium is a colorless, odorless, non-flammable gas. High purity helium is widely used in military, scientific research, petrochemical, refrigeration, medical, semiconductor, pipeline leak detection, superconducting experiments, metal manufacturing, deep sea diving, high-precision welding, optoelectronic product production, etc. What should we pay attention to when using high purity helium?
High purity helium should be used after decompression with pressure reducers such as YQY-12 or 152IN-125, and the leakage gas cylinder should be detected with soapy water before use to ensure that the gas cylinder does not leak.
Ensure that the helium does not leak and the workplace is ventilated. When the oxygen content is lower than 19.5% due to the increase of helium content, the patient will first experience rapid breathing, inattention, and ataxia. This is followed by fatigue, restlessness, nausea, vomiting, coma, convulsions, and death.
The packaged gas cylinder has a service life, and the expired gas cylinder must be sent to a department for safety inspection before it continue to be used.
When using the exhaust gas of each cylinder of helium, the residual pressure in the cylinder should be kept at 0.5MPa, the minimum residual pressure should not be lower than 0.25MPa, and the cylinder valve should be closed to ensure the quality of gas and the safety of use.
During transportation, storage and use, bottled helium should be classified and stacked, and should not be near open fire and heat source, should not be exposed to oil and wax, do not blow, do not re-throw, do not impact, arc or arc is strictly prohibited on the cylinder, and it is strictly prohibited to use a special cylinder trolley for short distance movement of helium cylinders, and dangerous goods transport vehicles for long distance movement of helium cylinders.
Liquid helium has a temperature of -268.9 °C and can cause severe frostbite in contact with skin.
