To do laboratory design must have known about the laboratory gas supply system. This is more common in the case of basic laboratory equipment. Today we mainly talk about the supply method in the laboratory gas supply system and the laboratory gas supply system. According to its supply methods, it can be divided into two major categories: centralized supply and distributed supply.
(1) Centralized gas supply principle: It is to place all types of gas cylinders that need to be used in various experimental analysis instruments in an independent cylinder chamber outside the laboratory for centralized management.
Centralized gas supply methods: All kinds of gases are transported from the gas cylinders to the pipeline, and are transported to different laboratory instruments of each laboratory according to the gas requirements of different experimental instruments.
The complete system includes: air source pressure control part (bus bar), gas pipeline part (EP grade stainless steel pipe), secondary pressure diverter part (function column), and terminal part connected to the instrument (joint, globe valve).
Complete system requirements: It has good airtightness, high cleanliness, durability and safety and reliability, and can meet the requirements of continuous use of various types of gas by experimental instruments. In the course of use, the whole or Local gas pressure and flow rate are adjusted in full scale to meet the requirements of different experimental conditions.
Centralized gas supply Advantages: Centralized gas source management, away from laboratories, and the safety of laboratory personnel;
Concentration of centralized gas supply: The disadvantage of the gas supply method is that the gas supply pipe is long, which leads to waste of gas, and opening or closing of the gas source must go to the gas cylinder, which is inconvenient to use.
(2) Decentralized gas supply: The gas cylinders or gas generators are placed in the analysis rooms of each instrument, respectively, close to the gas points of the instrument.
Decentralized gas supply advantages: easy to use, save gas, less investment;
Disadvantages of decentralized air supply: but due to gas cylinder approaching experimental personnel, the safety is poor;
Decentralized gas supply requirements: Generally require the use of explosion-proof gas bottle cabinet, and wait for the alarm function and exhaust function.
Alarm classification: alarms are divided into flammable gas alarms and non-flammable gas alarms.
Gas cylinder cabinet requirements: Gas cylinder cabinets should be equipped with gas cylinder safety warning signs and gas cylinder safety fixtures.
After talking about the way of gas supply, let's talk about the important point, which is what are the commonly used gases in the laboratory, the gas used in the laboratory is the high-purity gas used in precision instruments, the experimental gas (chlorine gas) used in chemical reaction experiments and auxiliary experiments Gases, compressed air, etc. used by gas chromatography, GC/MS, atomic absorption, ICP, and other precision instruments include gases (nitrogen, carbon dioxide), inert gases (helium, argon), and flammable gases. (hydrogen, acetylene), combustion gas (oxygen), etc.
Different gases, different types of gas cylinders used are also different, so everyone must pay attention to this issue when setting up the laboratory gas supply system.