refrigerating system

refrigerating system 4.1 Pressure vessels and pipelines are often contacted by refrigeration and air-conditioning technicians;; components of various systems; for example, placing an R--22 refrigerant storage tank on the rear panel of a car with a common barrier; The hot summer sun can make the temperature of the steel pipe reach 110F; the total area of ​​the steel tank by temperature-pressure is 1500; the total amount of side internal pressure [direction facing outward] is; 339000 In addition to the pressure that may exist in the refrigerant steel tank;; There may also be a large pressure in the nitrogen and oxygen steel tanks;; Transportation of nitrogen and oxygen steel tanks;; The allowable pressure is 2500;; Unless there is a safety insurance; otherwise Can not move; the same should also be fixed on the trolley with a chain;; The steel tank without the safety risk can break the steel tank valve when it arrives; The pressure in the tank will make the steel tank suddenly move forward like an air-filled balloon Before using nitrogen; the pressure of nitrogen must be adjusted; the pressure in the steel tank is too high;; it is difficult to connect with the system; if the operator puts nitrogen under the pressure of the steel tank; directly charge the system; then the refrigeration system will burst; If such weakness is on the compressor cylinder head; it is very dangerous; For the same reason; before using oxygen; the pressure of oxygen must also be adjusted; in addition, the connection pipe of oxygen must be absolutely oil-free;; if there is residual oil in the interface of the oxygen regulator, it will cause an explosion; such an explosion will be enough for the operator The pressure regulator is used to blow off; oxygen is usually used together with acetylene; acetylene bottle does not have the pressure of nitrogen and oxygen steel tanks but must also be given the same attention; because acetylene is very easy to explode; pressure relief valve must also be used; Special trolley; use the chain to fix the steel cylinder on the trolley and ensure that there is a safety insurance; all stored steel cylinders must have positioning support to avoid lying down; and according to different color standards, decompose and discharge 4.2 Electrical hazards The electrical hazards that often occur during burning caused by drinking out; drinking ribs on various lines is impossible if the power is cut off; therefore we must understand the live operation method of the circuit; If the wire is live; and you think that the components are in normal operating state; then don’t worry, only when the uncontrolled power supply appears [contacting two live wires at the same time] can you get injured. Electric shock When you become part of the circuit ;; electric shock will occur;; the heart will be hurt when the current passes through your body; ---- stop the heart from beating, ------ if it does not resume the heartbeat immediately, it will cause death; the best The way is of course to take first-aid measures; including life-saving CPR [cardiopulmonary recovery] method; safety precautions; to avoid electric shock;, to avoid becoming a conductor between two live conductors or between the live wire and the ground; electricity will definitely find circulation Path; and the higher the voltage you are exposed to; possible The greater the damage o; in the refrigeration and air-conditioning industry; we, the contact voltage is 460 volts; up to 560 volts o; therefore, we must understand the power supply voltage used in the work and related precautions; never be the body as a power source aisle