The pressure on a tube furnace can vary depending on the specific requirements of the experiment or process being conducted.
The pressure inside the furnace tube is typically controlled to ensure the safety and effectiveness of the operation.
Here are the key points that explain the pressure considerations in a tube furnace:
7 Key Points Explained: What You Need to Know About Tube Furnace Pressure
1. Maximum Allowable Pressure
The air pressure inside the furnace tube should not exceed 0.02 MPa.
This limit is crucial to prevent accidents such as furnace tube rupture or flange flying out.
2. Pressure Reduction Valve
A pressure reducing valve must be installed on the gas cylinder when introducing gas into the furnace tube.
The valve range is typically set between 0.01 MPa and 0.1 MPa to ensure accuracy and safety.
3. Pressure at High Temperatures
When the furnace temperature exceeds 1500°C, the furnace tube should not be in a vacuum state.
The air pressure inside the tube must be maintained at atmospheric pressure to prevent potential damage to the tube.
4. Gas Flow Rate
The gas flow entering the furnace tube should be limited to less than 200 SCCM (standard cubic centimeters per minute).
This helps to avoid thermal shocks to the heated corundum tube.
5. Vacuum and Low Pressure Conditions
Tube furnaces with quartz tubes are designed for use under vacuum and low pressure conditions (less than 0.2 bars or 0.02 MPa).
However, vacuum pressure should only be used up to 1000°C to ensure safety.
6. Controlled Atmosphere Furnaces
Controlled atmosphere tube furnaces designed for high-temperature operations (up to 3600 degrees Fahrenheit) require the use of a zirconia tube.
These furnaces operate at pressures up to 0.022 atmosphere.
7. Safety and Maintenance
Regular maintenance and monitoring of the pressure gauge are essential.
If the air pressure indication exceeds 0.02 MPa, the relief valve must be opened immediately to prevent accidents.
By adhering to these guidelines, the pressure on a tube furnace can be managed effectively to ensure safe and efficient operation.
Proper pressure control is vital for the longevity of the furnace and the integrity of the experiments being conducted.
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