Attention should be paid to the installation of stainless steel heat exchange tubes
By: mxgy,
The installation of stainless steel heat exchange tubes should revolve around “preventing damage, ensuring sealing, and improving efficiency”, with a focus on the following aspects:
Firstly, it is necessary to prepare in advance by checking the specifications of the heat exchange tubes (diameter, wall thickness, material) and their compatibility with the heat exchanger shell and tube plate, ensuring that there are no burrs or deformations at the tube ends. At the same time, clean the oil stains and impurities in the tube plate holes to avoid scratching the tube wall or affecting the sealing during installation; When handling and inserting tubes, they should be handled with care. A protective cover can be placed on the tube end to prevent collisions from causing dents in the tube mouth or scratches on the tube wall. Especially thin-walled pipes have poor toughness, and once damaged, they are prone to later leakage.
The second step is the connection between the tube and the plate. If expansion is used, the pressure and depth of the expansion tube need to be controlled to avoid excessive deformation and cracking of the tube wall caused by excessive pressure, or inadequate sealing caused by insufficient pressure; If it is welding, welding wire of the same material as the heat exchange tube should be used (such as ER308L welding wire for 304 tube), argon arc welding should be used to reduce the heat affected zone, and welding slag should be cleaned and passivated in a timely manner after welding to prevent intergranular corrosion at the weld joint. During installation, it is also necessary to ensure that the heat exchange tubes are perpendicular to the tube sheet to avoid uneven stress at the tube ends, and the spacing between the tubes must meet the design requirements to prevent eddy currents or erosion of the tube wall during fluid flow.
Furthermore, sealing and fixation are important. The sealing gaskets at both ends of the heat exchange tube (such as heat-resistant asbestos gaskets and fluororubber gaskets) should be intact and undamaged. During installation, ensure that the gaskets are centered to avoid displacement and seal failure; For long heat exchange tubes that require support, pipe clamps or supports should be installed at intervals to prevent vibration and collision of the tubes due to fluid impact during operation, which may damage the welds or tube walls.
Finally, after installation, a water pressure test (pressure 1.2-1.5 times the working pressure, held for 30 minutes) should be conducted on the heat exchange tubes to check for leaks at the welds and tube plate connections; At the same time, observe whether there are obvious bends or deformations in the heat exchange tubes to ensure that all tubes are in a normal stress state and avoid affecting the overall heat exchange efficiency and service life of the heat exchanger due to installation errors.
Attention should be paid to the installation of stainless steel heat exchange tubes
By: mxgy,
The installation of stainless steel heat exchange tubes should revolve around “preventing damage, ensuring sealing, and improving efficiency”, with a focus on the following aspects:
Firstly, it is necessary to prepare in advance by checking the specifications of the heat exchange tubes (diameter, wall thickness, material) and their compatibility with the heat exchanger shell and tube plate, ensuring that there are no burrs or deformations at the tube ends. At the same time, clean the oil stains and impurities in the tube plate holes to avoid scratching the tube wall or affecting the sealing during installation; When handling and inserting tubes, they should be handled with care. A protective cover can be placed on the tube end to prevent collisions from causing dents in the tube mouth or scratches on the tube wall. Especially thin-walled pipes have poor toughness, and once damaged, they are prone to later leakage.
The second step is the connection between the tube and the plate. If expansion is used, the pressure and depth of the expansion tube need to be controlled to avoid excessive deformation and cracking of the tube wall caused by excessive pressure, or inadequate sealing caused by insufficient pressure; If it is welding, welding wire of the same material as the heat exchange tube should be used (such as ER308L welding wire for 304 tube), argon arc welding should be used to reduce the heat affected zone, and welding slag should be cleaned and passivated in a timely manner after welding to prevent intergranular corrosion at the weld joint. During installation, it is also necessary to ensure that the heat exchange tubes are perpendicular to the tube sheet to avoid uneven stress at the tube ends, and the spacing between the tubes must meet the design requirements to prevent eddy currents or erosion of the tube wall during fluid flow.
Furthermore, sealing and fixation are important. The sealing gaskets at both ends of the heat exchange tube (such as heat-resistant asbestos gaskets and fluororubber gaskets) should be intact and undamaged. During installation, ensure that the gaskets are centered to avoid displacement and seal failure; For long heat exchange tubes that require support, pipe clamps or supports should be installed at intervals to prevent vibration and collision of the tubes due to fluid impact during operation, which may damage the welds or tube walls.
Finally, after installation, a water pressure test (pressure 1.2-1.5 times the working pressure, held for 30 minutes) should be conducted on the heat exchange tubes to check for leaks at the welds and tube plate connections; At the same time, observe whether there are obvious bends or deformations in the heat exchange tubes to ensure that all tubes are in a normal stress state and avoid affecting the overall heat exchange efficiency and service life of the heat exchanger due to installation errors.
