How to reasonably design the laboratory gas path?

<> laboratory gas circuits.

Laboratory gases are air, helium, nitrogen, and hydrogen. Among them, hydrogen (H2) is a flammable and explosive gas. The gases in this laboratory are all experimental gases, which are used in high-tech chromatographs.

In order to ensure the safety and purity of high-purity gas pipelines and the tightness of pipelines, we recommend choosing high-quality gas pipelines and fittings, and using clean pipelines with polished inside and outside. (316 material) where air is used air compressor and no busbar system is used.

In order to ensure the normal and safe use of the gas used in laboratory analysis and testing, it is necessary to build gas pipelines, special rooms, store gas cylinders in accordance with safety requirements, and build flammable and explosive gas alarm and exhaust systems to realize automatic alarm and exhaust dilution of flammable and explosive gas leakage, so as to prevent unnecessary damage to laboratory personnel and equipment caused by accidents. The gas source flows out from the gas storage cylinder group manifold discharge device, and after the pressure is reduced by a pressure reducing valve, it is connected to the final instrument pressure regulating device by the secondary pressure stabilizing device and then connected to the instrument through a special pipeline.

The pressure regulating devices, pipes and joints of the gas pipeline must have good corrosion resistance and leakage resistance, and can ensure the quality and safety of high-purity gases.

For the safety of the use of flammable and explosive gases such as H2, special safety design is required. The layout of H2 pipelines shall follow the relevant provisions in the safety technical specification (GB50177-93).

A ...Set up the venting tube outside the laboratory;

IIFor pipes passing through enclosed areas (such as above the ceiling), it is necessary to install casing, casing, and the outlet is open.

IIISet up 1 N2 purge pipe. When H2 is out of service, it is used for pressure holding and purging of the pipeline to reduce the O2 content in the pipeline and ensure the safe use of H2.

When designing the H2 line, a flame arrester is required at the outlet of the secondary pressure reducing valve. Gas detection and alarm are set up in the gas cylinder room, and the alarm device is linked with the explosion-proof exhaust fan.

The leakage alarm device consists of a main unit and a probe, one placed on the top of the gas cylinder and one pressed on the top of the laboratory. The main unit needs to be placed in a conspicuous place that is easy to operate!

and use grounding devices throughout the piping system to prevent lightning or static electricity. Insulation is used throughout the process for fixation. Outer tube protection when passing through the wall! Prevent gas leakage or pipe deformation due to changes in the wall.

The above is the practice of how to reasonably design the laboratory gas circuit summarized by Wofei.

How to reasonably design the laboratory gas path? Wanrong laboratory design for you to introduce:

The laboratory gas system is mainly composed of air source, switching device, pipeline system, pressure regulating device, gas consumption point, monitoring and alarm system. For some flammable and explosive gases, such as hydrogen, acetylene, etc., there may be slight differences in the design and construction process, and flame arresters must be added to prevent the spread of flames.

1. In order to ensure safety, explosion-proof walls and vents should generally be set up between gas cylinders, away from fire and heat sources, and corrosive environments.

2. For some toxic gases, the exhaust system should be arranged to prevent the leakage of toxic gases.

3. Semi-automatic switching device can be used for gas supply, which can reduce the number of bottle changes, save labor costs, and facilitate gas management.

4. Adjust the gas pressure to the required pressure at the gas point through the primary pressure reducer or the secondary pressure reducer.

5. Bright annealed stainless steel pipe (BA) is generally used for gas transportation.

6. The opening and closing of the gas is controlled by the ball valve.

For some flammable, explosive or toxic gases, it is necessary to install corresponding gas concentration detectors and alarms to achieve the role of warning.

The above is designed for you by Wanrong Laboratory.

1.In order to ensure safety, all kinds of gases used in experiments should be stored in a room with explosion-proof performance away from the working point as a gas chamber, otherwise a gas cylinder safety cabinet with automatic alarm function should be set up for storage.

2.The negative pressure exhaust system should be designed to ensure that the toxic and harmful gases do not leak indoors.

3.Design the corresponding number of ventilation fans with headwind valves according to the size of the room, so that the air circulation is smooth and clean.

4.Each room should be designed with a filter device, if it is a room with an indoor corridor, it can also be equipped with shutters on the doors and windows, and the size is calculated according to the proportion of exhaust volume.

The above is a summary of how to reasonably design laboratory gas circuits.