Laboratory centralized gas supply module system

Laboratory centralized gas supply module system

The laboratory gas supply system can be divided into dispersed gas supply and centralized gas supply according to its supply method.

(1) Distributed gas supply refers to placing gas cylinders or gas generators separately in various instrument analysis rooms, close to the gas consumption points of the instruments, which is convenient to use, saves gas consumption, and requires less investment; However, due to the proximity of the gas cylinder to the experimental personnel, the safety is poor, and it is generally required to use explosion-proof gas cylinder cabinets with alarm and exhaust functions. Alarm devices are divided into combustible gas alarm devices and non combustible gas alarm devices. The gas cylinder cabinet should be equipped with gas cylinder safety warning signs and gas cylinder safety fixing devices.

(2) Centralized gas supply is the process of placing all types of gas cylinders required for various experimental and analytical instruments in separate cylinder rooms outside the laboratory for centralized management. Various gases are transported through pipelines from the cylinder rooms to different experimental instruments in each laboratory according to their gas requirements. The entire system includes a gas source collection pressure control part (manifold), a gas transmission pipeline part (EP grade stainless steel pipe), a secondary pressure regulation and diversion part (functional column), and a terminal part (joint, globe valve) connected to the instrument. The entire system requires good airtightness, high cleanliness, durability, and safety reliability, which can meet the requirements of uninterrupted and continuous use of various gases by experimental instruments. During use, the overall or local gas pressure and flow rate can be fully adjusted according to the working conditions of the experimental instrument to meet the requirements of different experimental conditions.

Centralized gas supply can achieve centralized management of gas sources, away from laboratories, and ensure the safety of experimental personnel; However, the long gas supply pipeline leads to gas waste, and opening or closing the gas source requires going to the gas cylinder room, which is inconvenient to use.

Types of laboratory gases:

The commonly used gases in laboratories include high-purity gases for precision instruments, experimental gases for chemical reaction experiments (chlorine gas), and auxiliary experimental gases such as coal gas and compressed air. High purity gases used in precision instruments such as gas chromatography, gas chromatography-mass spectrometry, atomic absorption spectroscopy, and ICP mainly include inert gases (nitrogen, carbon dioxide), inert gases (helium, argon), and combustion assisting gases (oxygen).
The laboratory gas is mainly provided by gas cylinders, and some gases may be provided by gas generators. Common color differentiation and labeling of steel cylinders: oxygen cylinder (sky blue black text), hydrogen cylinder (dark green red text), nitrogen cylinder (black yellow text), compressed air cylinder (black white text), acetylene cylinder (white red text), carbon dioxide cylinder (green white black text), argon cylinder (gray green text), helium cylinder (brown).

Laboratory gas supply method:

1. Distributed gas supply, with fewer gas points for the same type of gas, and is used when distributed in a dispersed manner.

2. Centralized gas supply, with multiple gas usage points for the same type of gas, and when distributed in a centralized manner.

Advantages of centralized gas supply:

1. Easy to operate and safe, with a unified gas cylinder room where gases are classified and placed according to their combustible and non combustible properties. And measures such as ventilation, fire and explosion prevention, emergency shutdown, and undervoltage alarm are taken to facilitate the replacement and management of gas cylinders, ensuring safety.
2. Stable air pressure and high purity, supplied through multi-stage pressure reduction method. The gas pressure and flow rate of each gas consumption point can be adjusted at any time and displayed in real time. By installing a gas path blowing and replacement system, the gas supply purity is high.

3. Economical and practical, clean and beautiful, it can reduce the redundant construction of the same gas supply manifold, and the gas supply pipeline is uniformly planned, clean and beautiful.