How to do gas pipeline system engineering?

Laboratory gas circuit refers to laboratory gas engineering, that is, the pipeline connecting gas cylinders and instrument terminals. The installation of laboratory gas pipeline is a systematic technological process from the main valve of gas cylinder station (gas cylinder room) to the gas valves on the workbench of relevant instrument rooms. The gas path system is mainly used in the control equipment dealing with high-purity gas, or toxic gas and corrosive gas, and it is the real gas path system in the laboratory. This paper is the installation, construction and technological requirements of laboratory gas pipeline design put forward by Wan Zhi laboratory gas pipeline professional designers.

Conventional laboratories usually use two ways to plan the layout of related gases and laboratory gases. In addition, the design of laboratory gas pipeline also includes the material selection of relevant accessories, the installation technology of gas pipeline, the safe and reliable detection of gas system, the replacement of gas cylinders, transportation safety and other considerations. The design of medical gas pipeline engineering is different from the layout design of other laboratory gas pipeline engineering, but the accessories used, the principles of layout planning and the requirements of installation technology are basically the same.

The accessories of the laboratory gas system include the gas source collection pressure control part (bus bar); Experimental gas pipeline route (EP stainless steel pipe); Secondary voltage regulating shunt part (function column) and terminal part (connector, stop valve, etc.). ) connected to the instrument; Gas cylinder rack, gas cylinder cabinet, gas cylinder connector, metal hose, semi-automatic switch device, primary pressure reducer, secondary pressure reducer, welding tee, welding head, clamping valve, stainless steel pipe (BA), pressure gauge, flammable and toxic gas monitoring and alarm device, etc.

All pipes, valves and dynamometer are made of high quality stainless steel and are standard fittings.

The gas source of laboratory gas (except laboratory gas) is mostly supplied by high-pressure gas cylinders. By installing semi-automatic on-off control valve, gas cylinders can be replaced conveniently. In the centralized gas supply system, the main control valve and pressure reducing valve are installed outdoors, which is convenient to control the opening and closing of gas and the rise and fall of pressure. Valve controls corresponding to different gases shall be clearly marked. The laboratory gas pipeline is mainly made of stainless steel, installed under the ceiling and laid along the wall, which is convenient for inspection, management and maintenance. In addition, the introduction of gas pipeline in CCTV is guided by service column, or the service column is designed as gas pipeline. All gas pipelines are regulated by corresponding control valves or pressure-increasing or pressure-reducing valves on the workbench, which is convenient for operation. All gas transmission pipelines are connected by seamless welding.

Installation items and process requirements of laboratory gas pipeline engineering;

1. The gas pipeline is made of stainless steel, and there is a purification device for impurities and moisture exceeding the standard on the pipeline.

2. All gas pipelines are made of high-quality annealed seamless stainless steel. Copper pipes are only used at the end of gas pipelines or in places with low gas purity (such as fume hoods and test benches).

3. The gas pipeline needs a safety relief valve, a pressure regulating valve and a pressure gauge indicating the gas pressure.

4. The safety relief valve shall be marked with the pressure relief level. The pipeline layout shall be clearly marked at intervals to indicate the flow direction of the gas path, etc.

5. Considering the factors such as anti-corrosion, gas pipelines and related fittings brackets should be made of galvanized or anti-corrosion materials.

6. The pipeline branches should be exposed, and all pipelines should pay attention to the ventilation measures.

7. Leave enough maintenance space.