[Discussion] [Test Your Knowledge] Chemical Production Knowledge (36) – True or False Questions

1. Before using an oxygen respirator, it should be checked that the oxygen pressure is greater than 100 atm; this refers to the pressure in the oxygen tank. 2. Taking the AHG-2 oxygen respirator as an example for specific explanation: Main technical specifications: a. Filling pressure of the oxygen cylinder: 20 MPa; b. Oxygen storage capacity: 200 L; c. Volume of the oxygen cylinder: >1 L; d. Quantitative oxygen supply rate: >1.2 L/min; e. Automatic oxygen replenishment rate: >60 L/min; f. Manual oxygen replenishment rate: >60 L/min; g. Self-ventilation pressure: 100 Pa–300 Pa; h. Effective protection time: >2 hours; i. Weight (excluding oxygen and absorbent): ≤7 kg; j. Dimensions (mm): 345×345×190. Working principle: (1) The oxygen cylinder stores oxygen, with a volume greater than 1 L and a rated working pressure of 20 MPa. (2) The purification tank contains 1.1 kg of calcium hydroxide absorbent, which is used to absorb carbon dioxide from the exhaled breath. (3) Pressure regulator: It reduces the pressure of high-pressure oxygen to 0.31 MPa–0.36 MPa, and supplies it continuously to the air bag through a metering hole. When the oxygen pressure is reduced from 20 MPa to 2 MPa, the quantitative oxygen supply remains essentially unchanged. When the quantitative oxygen supply cannot meet the usage requirements, oxygen is supplied automatically or manually. (4) Automatic exhaust valve: It enables automatic exhaust when the pressure inside the air bag reaches a certain level, or when it is necessary to remove waste gas from the entire system. This product is a self-contained compressed oxygen respirator. The gas exhaled by the wearer from the lungs enters the purification tank through the mask, via the breathing hose and the exhalation valve. After the absorbent material in the purification tank absorbs the carbon dioxide contained in the exhaled gas, the remaining gas enters the air bag ； Elsewhere, the oxygen stored in the oxygen tank enters the air bag through high-pressure pipes and pressure regulators; these gases combine to form oxygen-rich gas. When the wearer inhales, oxygen-rich gas enters the lungs through the airbag, the inhalation valve, the inhalation hose, and the mask, thus completing one breathing cycle. In this cycle, since the exhalation valve and the inhalation valve are one-way valves, the airflow always flows in one direction. This respirator has 3 oxygen supply modes: (1) Controlled oxygen supply. The respirator supplies oxygen to the airbag at a flow rate of 1.2 L/min to 1.4 L/min, which can meet the breathing needs of the user during moderate levels of physical activity. (2) Automatic oxygen supply replenishment. When the workload increases and the fixed amount of oxygen supply is no longer sufficient to meet the needs of the wearer, an automatic supply device delivers oxygen to the air bag at a flow rate of over 60 L/min; it shuts off automatically once the air bag is full. (3) Manual oxygen supply. When too much exhaust gas accumulates in the airbag and needs to be removed, or when automatic oxygen supply is insufficient or fails, manual oxygen supply can be used. Usage: (1) After putting on the respirator, first open the oxygen tank and check the pressure value indicated by the pressure gauge (to see if it is greater than 100 atm). (2) Supply air by pressing the manual supply button to remove the gas previously accumulated in the air bag. (3) Put on the mask, then take a few deep breaths. Check to see if all components of the respirator are in good condition; only after confirming that everything is functioning properly can you proceed to work in the disaster area.

You’re referring to medical oxygen cylinders, right? Can it be assumed that it cannot be used when below this value (100)?