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Design and installation of laboratory gas system

Source: unknown popularity: Time of publication: April 10, 2020 08:29
1、 Installation design of gas circuit laboratory
 
1. The commonly used gases in laboratory are hydrogen, compressed air and nitrogen. If conditions permit, the gas storage with explosion-proof performance should be designed far away from the working point. If the condition is not allowed, the gas cylinder safety cabinet with automatic alarm function shall be installed for storage. The main control valve and pressure reducing valve of the air circuit introduced from the cylinder chamber are installed outside the laboratory.
The main material of the laboratory gas pipeline is stainless steel, which is installed under the ceiling and walks along the wall to facilitate inspection and maintenance. In addition, the gas pipeline of the central test-bed is introduced through the service column; all the gas pipelines are equipped with appropriate control valves and corresponding air inlets on the bench for easy operation. All gas pipes shall be connected by seamless welding.
The compressed air gas has a purification device, which is used to filter impurities and moisture on the pipeline. Flammable exhaust pipes cannot be connected together. The coil is made of stainless steel and has enough toughness. Pressure relief valves shall be marked with relief class. All valves, regulators and pressure gauges are made of high quality stainless steel and all gas pipes are properly grounded.
2. The technical requirement of gas cylinder cabinet is all steel frame. The cabinet door and side plate are made of cold-rolled metal plate and sprayed with epoxy resin powder. The movable gas cylinder hoop is installed inside to facilitate the replacement and movement of the gas cylinder. The foundation is composed of stainless steel screw, nylon cover and rubber base, with adjustable height of 0-0.3m. It is equipped with gas leakage alarm, temperature digital display and automatic discharge when gas leakage occurs. It has explosion-proof and flame retardant functions.
3. The laboratory should design corresponding number of ventilation fans with upwind valve according to the room size ratio to ensure smooth air circulation and keep clean. Each room should be designed with air vent with filter. In the case of rooms with indoor corridors, shutters can also be installed on doors and windows. The dimensions are calculated in proportion to the volume of exhaust gas.
 
 Gas circuit laboratory
 
Two. Code for design of gas circuit laboratory
 
1. Laboratory gas consumption, gas consumption point and what kind of gas is used.
2. The structure of the laboratory,
3. Gas storage device
4. Structure, specification and shape of gas test bench
5. The structure of the building where the laboratory is located.
6. The selection of fittings and components shall be based on the gas category and laboratory requirements.
Composition of laboratory gas circuit installation system
It is mainly composed of gas source switching system (primary pressure reducing system), pipeline and connecting parts system, secondary pressure regulating system, gas filtration and purification system, gas alarm system, pressure gauge, ball valve, etc.
Material requirements for gas circuit laboratory
1. High pressure bellows: the outer stainless steel mesh is lined with polytetrafluoroethylene material, the length is more than 1 meter, the path is greater than 6 mm, one end conforms to the connection model of standard steel cylinder, and the other end is connected with automatic switching system. Under pressure of more than 3000 psi. Its characteristics are: clean, bright, soft, corrosion-resistant.
Alarm type of low pressure gas alarm can be displayed at the same time. Explosion proof wiring, signal simulation and bus matching of automatic switching system.
3. Pressure reducing valve: 316L stainless steel. The inlet pressure of the main pressure reducing valve is 0-200 bar and the outlet pressure is 0-16 bar; the inlet pressure of the auxiliary pressure reducing valve is 0-16 bar and the outlet pressure is 0-6 bar. 1 / 4 "fnpt thread for inlet and outlet interface and 1 / 4" MNPT thread for pressure gauge interface.
4. Pipe: the inner surface of the pipe is made of grade Ba 316L American Society for testing and materials A269 standard stainless steel pipe, 316L stainless steel is bright annealed, the base material meets the Ba grade high purity pipeline, and the internal surface treatment value of the pipe is less than 0.37 U - pipe standard: 1 / 4 "- 1 / 2" wall thickness 0.88 mm. Drunk to withstand 300 bar pressure, suitable for 5.0 gas.
5. Joint: 316L stainless steel is used for bright annealing, and the base metal meets Ba grade high purity gas path fittings. Double ferrule design. After Hardy

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