Double tooth tube is a common industrial pipeline connector widely used in fields such as mechanical manufacturing, automobiles, hydraulic systems, chemical equipment, etc. It usually consists of two parts: an internally threaded pipe and an externally threaded pipe, which are fastened with double nuts to ensure the firmness and sealing of the connection. The correct use of double dental tubes is crucial for ensuring the safety and reliability of the system. The following is an analysis of the correct usage method for columns.
1、 The structure of double dental canals
The double dental canal is mainly composed of three parts:
Internal threaded pipe: used to connect the interface part of equipment or pipelines.
External threaded pipe: Cooperate with internal threaded pipe to achieve sealing through threaded connection.
Double nut: used to tighten externally threaded pipes, ensuring the firmness and sealing of the connection.
2、 The correct usage method of column
1. Check thread integrity
Before installation, it is necessary to carefully check whether the threads of the column are complete and undamaged. The integrity and smoothness of threads directly affect the sealing and firmness of the connection. If missing teeth, burrs or deformation are found in the thread, a new column should be replaced to avoid leakage or loose connection after installation.
2. Cleaning and lubrication
Before installation, it is necessary to thoroughly clean the threaded surface of the column with a cleaning agent or solvent to remove oil, dust, and impurities. After cleaning, apply an appropriate amount of thread sealant or grease on the threads. Sealing glue can enhance sealing performance, while lubricating grease helps tighten nuts and prevent thread corrosion. However, it should be noted that lubricating grease cannot undergo chemical reactions with the fluid medium in the system.
3. Install the nut correctly
When installing a double threaded tube, it is necessary to first screw the external threaded tube into the internal threaded tube, and then tighten it with double nuts. The correct installation steps are as follows:
Preliminary tightening: First, screw the external threaded pipe into the internal threaded pipe by hand until it cannot be turned by hand.
Tighten the nut: Use a wrench to tighten the first nut, and then tighten the second nut onto the first nut. The distance between two nuts should be maintained between 1-2 pitches to ensure sufficient preload.
Torque control: According to the specifications and materials of the column, use a torque wrench to tighten the nut according to the specified torque value. Avoid excessive tightening to prevent damage to the threads or deformation of the connection.
4. Stress testing and inspection
After installation, the pipeline system should undergo pressure testing to ensure the sealing and reliability of the double tooth pipe connection. Usually, the pressure for stress testing should be 1.5 to 2 times the working pressure of the system. During the testing process, carefully check whether there is any leakage at the connection of the column. If a leak is found, tighten the nut again or replace the column.
5. Regular inspection and maintenance
During the operation of the system, the fastening and sealing performance of the column connection should be regularly checked. Especially in situations with high vibration or harsh working environments, nuts may loosen, leading to leakage. Regular inspections can promptly identify and address issues, avoiding system failures caused by loose connections.
3、 Precautions for using double dental tubes
1. Avoid excessive tightening
Although columns require sufficient pre tightening force to ensure sealing, excessive tightening can cause thread damage or connection deformation. Therefore, when tightening the nut, it is necessary to strictly follow the specified torque value and avoid using brute force.
2. Prevent thread corrosion
In humid or corrosive environments, the threads of double threaded pipes are prone to rusting, leading to loose connections or inability to disassemble. During installation, anti rust grease should be applied and the rusting of the threads should be checked regularly. If rust is found, it should be cleaned or replaced in a timely manner.
3. Avoid excessive temperature changes
The material of the column may undergo thermal expansion and contraction when the temperature changes significantly, which may lead to loose connections. Therefore, when using columns in environments with significant temperature changes, insulation or compensation measures should be taken to ensure the stability of the connection.
4. Disassembly and replacement
When disassembling a double threaded tube, first loosen the double nuts and then carefully unscrew the externally threaded tube. If the threads are corroded or stuck, loosening agents or heating methods can be used for treatment, but care should be taken to avoid damaging the threads. When replacing the column, ensure that the specifications and materials of the new part are compatible with the original system.
4、 Summary
As an important industrial pipeline connector, the correct use of columns is crucial for ensuring the safety and reliability of the system. By checking the integrity of the threads, cleaning and lubrication, correctly installing nuts, conducting pressure tests, and regular maintenance, the sealing and firmness of the double threaded pipe connection can be ensured. In practical use, attention should also be paid to avoiding excessive tightening, preventing thread corrosion, and dealing with temperature changes. Only by strictly following the correct usage methods can the advantages of columns be fully utilized to ensure the efficient operation of industrial systems.
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