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Gas pipeline engineering
Gas pipeline: refers to the connecting pipeline between gas cylinders and instrument terminals, generally consisting of gas switching devices, pressur
Product details
Gas supply method for laboratory gas
The gas supply method adopts medium pressure gas supply and two-stage pressure reduction. The gas cylinder pressure is 12.5MPa, and after the first stage pressure reduction, it is 1MPa (pipeline pressure 1MPa). It is sent to the gas consumption point, and after the second stage pressure reduction, it is 0.3-0.5 MPa (according to the instrument requirements) and sent to the instrument. The gas supply pressure is relatively stable.
Material requirements for laboratory gas pipelines
(1) No permeability to all gases
(2) Minimal adsorption effect
(3) Chemically inert to the gas being transported
(4) Can quickly achieve equilibrium in the transported gas
Note: Chemical substance corrosion impact level A - no impact B - slight impact C - moderate impact D - severe impact
316 stainless steel is the second most widely used steel grade after 304 stainless steel, with good corrosion resistance, high temperature resistance, and excellent strength. Therefore, we have always used 316 seamless stainless steel pipes.
Key points of laboratory gas supply system design
(1) The carrier gas is transported to the instrument through gas cylinders and conveying pipelines. A one-way valve is installed at the outlet of the gas cylinder to prevent air and moisture from entering when replacing the cylinder. In addition, a pressure relief switch ball valve is installed at one end to discharge excess air and moisture before connecting it to the instrument pipeline to ensure the purity of the gas used by the instrument.
(2) The centralized gas supply system adopts a two-stage pressure reduction method to ensure stable pressure. Firstly, after the first stage of pressure reduction, the pressure in the main pipeline is greatly reduced compared to the pressure in the gas cylinder, which acts as a buffer for pipeline pressure, improves gas safety, and reduces application risks. Secondly, it ensures the stability of the inlet pressure of the instrument gas supply, reduces measurement errors caused by gas pressure fluctuations, and ensures the stability of instrument use.
(3) Due to the use of flammable gases such as methane, acetylene, and hydrogen in some laboratory instruments, when making pipelines for these flammable gases, attention should be paid to keeping the pipelines as short as possible and reducing the connection of intermediate joints. At the same time, the gas cylinders must be installed in explosion-proof gas cylinder cabinets, and the output end of the gas cylinders should be connected to a flashback to prevent explosions caused by flame backflow. The top of the explosion-proof gas cylinder cabinet should have a ventilation exhaust port connected to the outside, and there should be a leak alarm device. Once there is a leak, an alarm should be triggered in a timely manner and the gas should be discharged to the outside.
Precautions for installation of laboratory gas engineering
(1) The pipeline with a diameter of 1/8 is very thin and soft, and it is not straight after installation, which is very unsightly. It is recommended to replace all pipelines with 1/8 diameter and add a diameter change at the end of the secondary pressure reducer.
(2) The pressure gauge range for nitrogen, argon, compressed air, helium, methane, and oxygen pressure reducers is 0-25Mpa, and for secondary pressure reducers it is 0-1.6 Mpa. The range of the first stage acetylene pressure reducer is 0-4 Mpa, and the range of the second stage pressure reducer is 0-0.25 Mpa.
(3) Nitrogen, argon, compressed air, helium, and oxygen steel cylinder joints share two types of hydrogen steel cylinder joints: forward rotation steel cylinder joints and reverse rotation steel cylinder joints. The atmospheric bottle uses reverse rotation, while the small gas bottle uses forward rotation.
(4) Gas pipelines should have pipe fittings installed every 1.5m at bends and at both ends of valves.
(5) Gas pipelines should be exposed along the wall for installation and maintenance purposes.
The gas supply method adopts medium pressure gas supply and two-stage pressure reduction. The gas cylinder pressure is 12.5MPa, and after the first stage pressure reduction, it is 1MPa (pipeline pressure 1MPa). It is sent to the gas consumption point, and after the second stage pressure reduction, it is 0.3-0.5 MPa (according to the instrument requirements) and sent to the instrument. The gas supply pressure is relatively stable.
Material requirements for laboratory gas pipelines
(1) No permeability to all gases
(2) Minimal adsorption effect
(3) Chemically inert to the gas being transported
(4) Can quickly achieve equilibrium in the transported gas
Note: Chemical substance corrosion impact level A - no impact B - slight impact C - moderate impact D - severe impact
316 stainless steel is the second most widely used steel grade after 304 stainless steel, with good corrosion resistance, high temperature resistance, and excellent strength. Therefore, we have always used 316 seamless stainless steel pipes.
Key points of laboratory gas supply system design
(1) The carrier gas is transported to the instrument through gas cylinders and conveying pipelines. A one-way valve is installed at the outlet of the gas cylinder to prevent air and moisture from entering when replacing the cylinder. In addition, a pressure relief switch ball valve is installed at one end to discharge excess air and moisture before connecting it to the instrument pipeline to ensure the purity of the gas used by the instrument.
(2) The centralized gas supply system adopts a two-stage pressure reduction method to ensure stable pressure. Firstly, after the first stage of pressure reduction, the pressure in the main pipeline is greatly reduced compared to the pressure in the gas cylinder, which acts as a buffer for pipeline pressure, improves gas safety, and reduces application risks. Secondly, it ensures the stability of the inlet pressure of the instrument gas supply, reduces measurement errors caused by gas pressure fluctuations, and ensures the stability of instrument use.
(3) Due to the use of flammable gases such as methane, acetylene, and hydrogen in some laboratory instruments, when making pipelines for these flammable gases, attention should be paid to keeping the pipelines as short as possible and reducing the connection of intermediate joints. At the same time, the gas cylinders must be installed in explosion-proof gas cylinder cabinets, and the output end of the gas cylinders should be connected to a flashback to prevent explosions caused by flame backflow. The top of the explosion-proof gas cylinder cabinet should have a ventilation exhaust port connected to the outside, and there should be a leak alarm device. Once there is a leak, an alarm should be triggered in a timely manner and the gas should be discharged to the outside.
Precautions for installation of laboratory gas engineering
(1) The pipeline with a diameter of 1/8 is very thin and soft, and it is not straight after installation, which is very unsightly. It is recommended to replace all pipelines with 1/8 diameter and add a diameter change at the end of the secondary pressure reducer.
(2) The pressure gauge range for nitrogen, argon, compressed air, helium, methane, and oxygen pressure reducers is 0-25Mpa, and for secondary pressure reducers it is 0-1.6 Mpa. The range of the first stage acetylene pressure reducer is 0-4 Mpa, and the range of the second stage pressure reducer is 0-0.25 Mpa.
(3) Nitrogen, argon, compressed air, helium, and oxygen steel cylinder joints share two types of hydrogen steel cylinder joints: forward rotation steel cylinder joints and reverse rotation steel cylinder joints. The atmospheric bottle uses reverse rotation, while the small gas bottle uses forward rotation.
(4) Gas pipelines should have pipe fittings installed every 1.5m at bends and at both ends of valves.
(5) Gas pipelines should be exposed along the wall for installation and maintenance purposes.
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