Tubesheet is an accessory that serves the purpose of drilling a hole in the steel plate that is equal to the outside diameter of the pipe, and then threading the pipe through and welding it in place. In the calculation of fixed tube-sheet according to the temperature difference of various working conditions to calculate the axial stress of the shell, the axial stress of the heat exchange tube, the pull force Q between the heat exchange tube and the tube-sheet, there is one can not meet the strength (or stability) conditions, it is necessary to set expansion joint. In the fixed tube-sheet strength check calculation, when the tube-sheet thickness is determined, when the expansion joint is not set, sometimes the tube-sheet strength is not enough, after the expansion joint is set, the tube-sheet thickness may meet the requirements. At this time, expansion joint can also be set to reduce the tubesheet, but it should be determined from the comprehensive evaluation of material consumption, manufacturing difficulty, safety and economic effect.
The U expansion joint is commonly used in fixed tubesheet heat exchanger. It has the advantages of compact and simple structure, good compensation and cheap price.
The precision of tube plate processing, especially the tolerance of tube hole spacing and tube diameter, perpendicularity and finish, all greatly affect the assembly and operation performance of the chemical equipment listed above. With the upsizing of chemical equipment and power stations, the diameter of tubesheet has become larger and larger, and the diameter of tubesheet of 4m-5m is very common. Large tubesheet is characterized by a large number of tube holes, dense, small aperture, depth, precision and high finish requirements. Tubesheet is widely used in tube heat exchanger, boiler, pressure vessel, steam turbine, large central air conditioning and other industries.
Tubeplate flanges are made of different materials according to the needs of different environments. Generally, Q345R container plates are used, such as first and second level pressure vessels. There is no corrosive medium circulation, and carbon steel composite plates are used.
Our company produces and supplies different kinds of tubessheet flanges, and has reliable quality.
Sophisticated equipment: the company has a large CNC horizontal deep hole drilling machine made in Germany and Spanish system and a number of radial drilling machines and other special tubesheet processing machines. The drilling depth is 200-1000mm, the machining aperture is φ 10-φ 36mm, and the roughness is 1.6-0.8um.
Use of drilling tools: internal chip drill pipe, BTA drill bit (Germany, Japan), imported cuttings, etc.
Superb technology: the use of CAD automatic programming, thick tubesheet by CNC machine processing, ordinary tubesheet, baffle, baffle by CNC machine positioning processing.
Drilling quality assurance: coolant high pressure protection drilling, coolant low pressure protection drilling, spindle torque protection drilling, feed anti-feed protection drilling, automatic alarm protection drilling, to ensure that every hole tube plate zero error.
Paper machine cold cylinder semi-finished sheet metal welding processing Welded flanged tapered steel pipe full flanged welded pipe
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