Tubesheet With Large Diameter
- February 02, 2013
- Diana Anderson
Tube plate is in a circular plate on the drill pipe diameter is slightly larger than the same hole, pipe penetration welded fixed, plays a role of such accessories.
In the calculation of fixed tube plate in various working temperature to calculate casing axial stress, axial stress, heat pipe between the heat pipe and pipe plate pull-out force Q, one can not meet the strength (or stable) conditions, will need to set expansion joint. In the fixed tube plate strength calculation, when the tube plate thickness is determined, no expansion joint, sometimes tube plate set expansion joint, strength is not enough, the tube plate thickness could meet the requirements. At this point, it can also be set up to reduce the expansion section of thin tube plate, but from the material consumption, manufacturing, safety and economic results and other comprehensive evaluation.
The tube plate machining accuracy, especially the tube hole spacing and diameter tolerances, verticality and smoothness have a great impact on the above assembly and use performance of chemical equipment. With the chemical equipment, power station of large, the diameter of the tube plate is becoming larger and larger, the diameter of the tube plate is very common 4m-5m. Large tube plate is characterized by a large number of tube holes, dense, small, deep, deep, precision and smooth finish requirements.
Tube plate usage
The tube plate is widely used in heat exchanger, boiler, pressure vessel, steam turbine, large central air-conditioning industry.
Mainly used for chemical containers, such as heat exchanger, pressure vessel, boiler, condenser, evaporator, central air conditioning, desalination, supporting fixed tube, metal material which not only has strong rigidity, but also has great heat conduction performance.
Tube sheet material
Depending on the need to use the environment, the use of different materials, the general use of Q345R container board, such as the one or two pressure vessel, no corrosive media flow, using carbon steel composite plate. Have strong, high temperature and high pressure, such as nuclear power environment requires 16 stainless steel, manganese, corrosion resistance of titanium alloy material, the application of new synthetic materials, to the tube plate products bring new vitality.
ASME Material Specification
Carbon Steel: ASTM/ASME A105, A350 LF1, LF2, A266, A694, A765 Gr2
Alloy Steel : ASTM/ASME SA182 F1, F5, F9, F11, F12, F22, F51, A350- LF3
Stainless Steel: ASTM/ASME SA182 F304, 304L, F316, 316L, F310, F317L, F321, F347
Duplex stainless-steel : ASTM / ASME SA 182 F 44, F 45, F51, F 53, F 55, F 60, F 61
Tube sheet processing
For tube plate three or four types of pressure vessels need high precision, hole processing method is the traditional fitter, rocker drill. With the chemical container of large-scale, the diameter of the tube plate is also increasing, the thickness is gradually thick, the tube sheet is also introduced into the numerical control technology, the use of CNC drilling hole with the rocker drilling hole processing. The use of machining center to do high efficiency and high precision machining has gradually been accepted by a number of large enterprises. Large thick tube plate in nuclear power, seawater desalination, and the central air conditioning heat exchanger area of the demand for a growing trend.