I’m facing a problem with my undergraduate graduation project; I hope everyone can help me solve it
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Dear experts, I have a question: In the standards NB/T47020–47027, the highest flange pressure class applicable to pressure vessels is 6.4 MPa. So which standard applies to pressure vessel flanges with pressures higher than 6.4 MPa?
Refer to dimensions for custom design calculations
If it is higher than this pressure, it is generally a flange used for high-pressure vessels. If it is a pipe, you can choose the JB/T2769 high-pressure threaded flange; if it is a equipment flange, you will need to carry out your own design and calculations. The selection of the sealing surface type for high-pressure vessel flanges is very important, and you can make your choices and calculations based on the types specified in GB/T150.
For non-standard flanges, design and calculation are carried out based on the dimensions of 47020; RJ sealing surfaces are generally used for high-pressure sealing.
The explanation on the 3rd floor is very detailed! If the equipment diameter is small, at 9 MPa we generally use custom flanged weld necks; however, care must be taken in selecting gaskets and fasteners. Above 10 MPa, a high-pressure end structure is used.
In design, it is common to encounter situations that go beyond the standard ranges. GB/T150.3 provides methods for calculating flanges; the SW6 software can also be used. The key aspects of flange design include the selection of structural dimensions, the choice of gaskets, the selection of the material and specifications of fasteners, the selection of sealing methods, as well as the flange torque considering operating conditions and pre-tightening levels.
Mine has box flanges; is it very complicated to carry out custom design?
I just need to find a set of parameters, but the diameter of my tube box flange is 1400 mm. According to the standards, there is no value of 1400 mm at 6.4 Mpa; the maximum value specified is 1200 mm. What should I do?
With such high pressure, choosing a smaller diameter for the equipment will result in thinner walls, which also makes it easier to select the appropriate flanges; it is recommended to reduce the equipment’s diameter.
Refer to the flange of the hg section. The flange needs to be calculated